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SECTION 1006 PORTLAND CEMENT CONCRETE:

1006-1 Genera l Requirements:

Por t land cement concre te sha l l cons is t o f a mix tu re o f hydrau l ic cement , f ine aggregate , coarse aggregate , and water . I t may a lso conta in chemica l admix tures , add i t ives , and supp lementary cement i t ious mater ia ls meet ing the requ i rements here in .

The cont rac tor sha l l de termine the mix p ropor t ions and sha l l fu rn ish concre te wh ich conforms to the requ i rements o f the spec i f i ca t ions . A l l concre te sha l l be su f f ic ien t ly workab le , a t the s lump proposed by the cont rac tor wi th in the spec i f ied range, to a l low proper p lacement o f the concre te wi thout segregat ion , b leed ing, o r incomple te conso l ida t ion . I t sha l l be the respons ib i l i ty o f the cont rac tor to p ropor t ion , mix , p lace , f in ish , and cure the concre te p roper ly in accordance wi th the requ i rements o f the spec i f i ca t ions .

1006-2 Mater ia ls :

1006-2 .01 Cement i t ious Mater ia l :

(A) Genera l :

Cement i t ious mater ia l i s de f ined as an inorgan ic mater ia l o r a mix tu re o f inorgan ic mater ia ls tha t se ts and deve lops s t rength by chemica l reac t ion wi th water by fo rmat ion o f hydra tes and is capab le o f do ing so under water . In th is spec i f i ca t ion , cement i t ious mater ia ls a re de f ined as hydrau l ic cement (Por t land cement o r Por t land-pozzo lan cement ) and supp lementary cement i t ious mater ia ls ( f l y ash , na tura l pozzo lan , or s i l i ca fume) .

(B) Hydraul ic Cement:

Hydrau l ic cement sha l l cons is t o f e i ther Por t land cement o r Por t land-pozzo lan cement .

Por t land cement sha l l con form to the requ i rements o f ASTM C150 fo r Type I I , I I I , o r V, and sha l l no t con ta in more than 0 .60 percent to ta l equ iva len t a lka l ies .

Por t land-pozzo lan cement sha l l con form to the requ i rements o f ASTM C595 fo r b lended hydraul ic cement wi th modera te su l fa te res is tance, Type IP (MS) .

Cement o f d i f fe ren t types or b rands sha l l no t be in te rmingled or used in the same batch . The cont rac tor sha l l p rov ide su i tab le means fo r s to r ing and pro tec t ing the cement aga ins t dampness . Cement wh ich has become par t ia l l y se t o r wh ich conta ins caked lumps sha l l no t be used.

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The use o f e i ther sacked cement o r bu lk cement is permiss ib le . The use o f f rac t iona l bags o f sacked cement wi l l no t be permi t ted un less the cont rac tor e lec ts to we igh the cement in to each ba tch .

(C) Supplementary Cement i t ious Mater ia ls :

(1 ) Genera l :

Supp lementary cement i t ious mater ia ls may be used in add i t ion to hydrau l ic cement . Supp lementary cement i t ious mater ia ls sha l l be approved pr io r to the i r use . When e i ther modera te o r h igh su l fa te res is tan t concre te is spec i f ied in the Spec ia l Provis ions , the proposed hydrau l ic cement /supp lementary cement i t ious mater ia l b lend sha l l be tes ted fo r su l fa te expansion in accordance wi th ASTM C1012. When modera te su l fa te res is tance is spec i f ied , the max imum expans ion sha l l be 0 .10 percent a t s ix months . When h igh su l fa te res is tance is spec i f ied , the max imum expans ion sha l l be 0 .05 percent a t s ix months or 0 .10 percent a t one year .

(2 ) Fly Ash and Natura l Pozzolan:

Fly ash and na tura l pozzolan sha l l con form to the requ i rements o f ASTM C618 fo r Class C, F, o r N, except tha t the loss on ign i t ion fo r Class F and Class C sha l l no t exceed 3 percent .

(3 ) Si l ica Fume:

Si l ica fume sha l l con form to the requ i rements o f ASTM C1240. Cer t i f i ca t ion o f s i l i ca fume wi l l be based on a Cer t i f i ca te o f Compl iance conforming to the requ i rements o f Subsec t ion 106.05 o f the spec i f i ca t ions submi t ted fo r each lo t o f s i l i ca fume.

(D) Acceptance of Cement i t ious Mater ia ls :

The cer t i f i ca t ion and acceptance o f cement i t ious mater ia ls wi l l be on the bas is o f the mater ia ls o r ig ina t ing f rom an Approved Mater ia ls Source . Approved Mater ia ls Sources L is ts fo r cement i t ious mater ia ls a re main ta ined by the ADOT Mater ia ls Group, St ruc tura l Mater ia ls Tes t ing Sec t ion .

Source approva l o f hydrau l ic cement , f ly ash , and na tura l pozzo lan producers /supp l ie rs wi l l be based on month ly submi t ta ls to the ADOT Mater ia ls Group, St ruc tura l Mater ia ls Test ing Engineer , a t cer t@azdot .gov . The fo l lowing documenta t ion sha l l be submi t ted :

(1 ) A Cer t i f i ca te o f Compl iance wh ich l is ts the lo ts p roduced dur ing tha t month ; and

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(2 ) A separa te Cer t i f i ca te o f Ana lys is fo r each lo t shown on the cor respond ing Cer t i f i ca te o f Compl iance fo r tha t month .

1006-2 .02 Water :

Water sha l l meet the requ i rements o f ASTM C1602, except tha t i t sha l l con ta in no more than 1 ,000 par ts per mi l l ion o f ch lo r ides as Cl and no more than 1 ,000 par ts per mi l l ion o f su l fa tes as SO4. The water used sha l l be f ree o f in ju r ious amounts o f o i l , ac id , a lka l i , c lay , vegetab le mat te r , s i l t , or o ther harmfu l mat te r . Po tab le water ob ta ined f rom pub l ic u t i l i t y d is t r ibu t ion l ines wi l l be acceptab le .

1006-2 .03 Aggregates:

(A) Genera l Requirements:

When concre te is to be p laced a t e leva t ions above 4 ,500 fee t , the f ine aggregate and the coarse aggregate sha l l be sub jec ted to f i ve cyc les o f the sod ium su l fa te soundness tes t , and the we igh ted percentage loss de termined separa te ly fo r each, in accordance wi th the requ i rements o f ASTM C88. The we igh ted percentage loss de termined fo r each sha l l no t exceed 10 percent . Tes ts fo r soundness may be wa ived when aggregates f rom the same source have been approved and the approved tes t resu l ts app ly to the cur ren t p roduc t ion f rom tha t source .

Mi l l ta i l ings or mater ia l f rom mine dumps sha l l no t be used in the produc t ion o f f ine or coarse aggregate .

The fo l lowing tes t methods may be used to eva lua te the qua l i ty o f aggregates fo r concre te :

TABLE 1006-1 Test Methods for Qual i ty of Aggregates

Sampl ing Ar izona Tes t Method 105 Reduc ing f ie ld samples to tes t ing s ize AASHTO R 76 Poten t ia l fo r Alka l i S i l i ca React ion (ASR)

ASTM C1260, C1567, o r ASTM C1293

Clay lumps and f r iab le par t ic les AASHTO T 112 L igh twe igh t par t ic les (Spec i f i c grav i ty less than 2 .0)

AASHTO T 113 (See Note1)

Organ ic impur i t ies AASHTO T 21 Aggregate gradat ion Ar izona Tes t Method 201 Soundness (Sod ium Su l fa te ) ASTM C88

Mor ta r St rength AASHTO T 71 (See Note1)

Sand equ iva len t AASHTO T 176 L .A. abras ion AASHTO T 96 Frac tured Coarse Aggregate Par t ic les Ar izona Tes t Method 212

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TABLE 1006-1 Test Methods for Qual i ty of Aggregates

Note :

(1 ) AASHTO T 113 and T 71 are mod i f ied as spec i f ied in Subsec t ions 1006-2 .03(B) and 1006-2 .03(C) o f the spec i f i ca t ions .

(B) Fine Aggregate:

Fine aggregate sha l l be a na tura l o r manufac tured sand, o r o ther approved iner t mater ia l wi th s imi la r charac ter is t ics, composed o f c lean, hard , s t rong, durab le , uncoated par t ic les . The aggregate sha l l be washed and sha l l con form to the requ i rements o f AASHTO M 6 , wi th the fo l lowing except ions :

The amount o f de le te r ious subs tances in the washed f ine aggregate sha l l no t exceed the fo l lowing l imi ts by d ry we igh t , when tes ted in accordance wi th the fo l lowing tes t methods :

TABLE 1006-2 Deleter ious Substances in Fine Aggregate

Clay lumps and f r iab le par t ic les AASHTO T 112 0 .5%

L igh twe igh t par t ic les (Spec i f ic grav i ty less than 2 .0)

AASHTO T 113 (Except tha t the percent o f

l igh twe igh t par t ic les sha l l be repor ted to the

neares t 0 .01%.)

1 .25% (0 .25%

Max. Coa l and

L ign i te* ) Note : *On ly mater ia l tha t is b rown ish-b lack , o r b lack , sha l l be cons idered coa l o r l ign i te .

F ine Aggregate sha l l meet the fo l lowing gradat ion requ i rements when tes ted in accordance wi th Ar izona Tes t Method 201.

TABLE 1006-3 Gradat ion of Fine Aggregate

Sieve Size Percent Passing 3/8 in . 100 No. 4 95 - 100

No. 16 45 - 80 No. 50 0 - 30

No. 100 0 - 10 No. 200 0 - 4 .0

F ine aggregate sha l l have a sand equ iva len t va lue o f no t less than 75 . F ine aggregates sha l l be sub jec ted to tes t ing under AASHTO T 21 fo r o rgan ic impur i t ies . F ine aggregate produc ing a co lo r darker than the s tandard co lo r sha l l be re jec ted un less the mater ia l passes the mor ta r s t rength requ i rements spec i f ied in the fo l lowing paragraph:

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F ine aggregate no t meet ing the requ i rements fo r o rgan ic impur i t ies sha l l be made in to mor ta r and sub jec ted to tes t ing in accordance wi th AASHTO T 71 , except tha t the mor ta r sha l l deve lop a compress ive s t rength a t seven and 28 days o f no t less than 90 percent o f that deve loped by a mor ta r p repared in the same manner wi th the same Type I I cement and graded sand conforming to the requ i rements o f ASTM C778.

(C) Coarse Aggregate:

Coarse aggregate sha l l cons is t o f c rushed s tone, grave l , c rushed grave l , o r o ther approved iner t mater ia l o f s imi la r charac ter is t ics , inc lud ing c inders when spec i f ied , hav ing hard , s t rong and durab le p ieces f ree o f c lay and o ther de le te r ious subs tances . The aggregate sha l l be washed. The aggregate gradat ion , when tes ted in accordance wi th Ar izona Tes t Method 201, sha l l con form to the appropr ia te s ize des ignat ion o f AASHTO M 43.

The amount o f de le te r ious subs tances in the washed coarse aggregate sha l l no t exceed the fo l lowing l imi ts by d ry we igh t , when tes ted in accordance wi th the fo l lowing tes t methods , except as no ted :

TABLE 1006-4 Deleter ious Substances in Coarse Aggregate

Clay lumps and f r iab le par t ic les AASHTO T 112 0 .3%

L igh twe igh t par t ic les (Spec i f ic grav i ty less than 2 .0)

AASHTO T 113 (Except tha t the percent o f

l igh twe igh t par t ic les sha l l be repor ted to the

neares t 0 .01%.)

1 .25% (0 .25%

Max. Coa l and

L ign i te* ) Mater ia l pass ing No. 200 s ieve

Ar izona Tes t Method 201 1 .0%

Note : * On ly mater ia l tha t is b rown ish-b lack , o r b lack , sha l l be cons idered coa l o r l ign i te .

The percent o f wear o f coarse aggregate a t 500 revo lu t ions , when tes ted in accordance wi th the requ i rements o f AASHTO T 96 , sha l l no t exceed 40 . The percent o f one face f rac tured coarse aggregate par t ic les sha l l be a t leas t 30 when tested in accordance wi th the requ i rements o f Ar izona Tes t Method 212.

1006-2 .04 Admixtures and Addi t ives:

(A) Genera l Requirements:

A l is t o f approved admix tu res and add i t ives is ma in ta ined on the Depar tment ’s Approved Produc ts L is t (APL) . Cop ies o f the most recent

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vers ion o f the APL are ava i lab le on the Depar tment ’s webs i te f rom the ADOT Research Center th rough i ts Produc t Eva lua t ion Program. Admix tu res and add i t ives o ther than those l i s ted on the APL may be cons idered fo r use as spec i f ied in Subsec t ion 106.14 o f the spec i f i ca t ions .

Cer t i f i ca tes o f Compl iance sha l l be submi t ted wh ich c lear ly s ta te the t ime per iod in wh ich the produc t ion o f the produc t meets the appropr ia te ASTM s tandard and tha t fo rmula t ion o f the produc t has no t changed dur ing the s ta ted t ime per iod . The t ime per iod sha l l be l imi ted to 12 months pr io r to the da te o f s ignature on the cer t i f ica te . The cer t i f i ca te sha l l be submi t ted to the ADOT Mater ia ls Group, St ruc tura l Mater ia ls Tes t ing Sec t ion , and re ta ined fo r record .

Concre te admix tu res and add i t ives sha l l be un i fo rm th roughout the i r use in the work . Al l concre te admix tu res and add i t ives sha l l be s to red in su i tab le conta iners in accordance wi th the manufac turer 's recommendat ions . A l l l iqu id admix tu res sha l l be pro tec ted f rom f reez ing. L iqu id admix tu res tha t have f rozen sha l l no t be used. I f more than one admix tu re is used, the admix tu res sha l l be compat ib le wi th each o ther so tha t the des i red e f fec ts o f a l l admix tu res used are rea l ized .

Admix tu res and add i t ives hav ing a ch lo r ide concent ra t ion o f 10 ,000 par ts per mi l l ion (1 percent by we igh t o f the admix tu re) o r less , as de termined in accordance wi th Ar izona Tes t Method 738 or Tes t Method BS EN 480-10:2009, a re acceptab le un less o therwise spec i f ied . Ca lc ium ch lo r ide as a separa te admix tu re sha l l no t be used. At no t ime sha l l mater ia ls wi th ch lo r ides be incorpora ted in to any precas t b r idge members , p recas t concre te p roduc t , o r concre te p ipe produc t .

(B) Chemical Admixtures:

Air -en t ra in ing admix tu res sha l l con form to the requ i rements o f ASTM C260.

Water reduc ing, re ta rd ing, hydra t ion s tab i l i z ing, and acce le ra t ing admix tu res sha l l con form to the requ i rements o f ASTM C494 fo r the appropr ia te type .

Spec i f ic per fo rmance admix tu res fo r p recas t i tems, pa tch ing mater ia ls , o r o ther p roduc ts sha l l a lso conform to the requ i rements o f ASTM C494, inc lud ing da ta to subs tan t ia te the spec i f i c per fo rmance charac ter is t ics .

(C) Addi t ives:

Pigments incorpora ted in to the approved concre te mix des ign fo r in tegra l ly co lo red concre te sha l l meet the requ i rements o f ASTM C979.

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F ibers incorpora ted in to the approved concre te mix sha l l meet the requ i rements o f ASTM C1116. The spec i f i c type , s ize , and quant i ty of f iber sha l l be de termined by the mix des igner .

Mic ro f iber add i t ive may be used fo r p las t ic shr inkage cont ro l , sub jec t to approva l by the Engineer .

1006-3 Design of Mixtures:

1006-3 .01 Design Cr i ter ia :

Por t land cement concre te sha l l con form to the requ i rements spec i f ied in Tab le 1006-5 fo r each o f the c lasses l i s ted there in . Un less o therwise spec i f ied , the cement i t ious mater ia l con ten t sha l l be as shown:

TABLE 1006-5 Design Cr i ter ia

Class of Concrete

Minimum 28-Day

Compressive Strength

Required: ps i (ASTM C39)

Hydraul ic Cement

Content : Lbs. per Cu Yd.

Minimum-

Maximum

Maximum Water -

Cement i t ious Mater ia l

Rat io (w/cm): Lb. /Lb.

Slump Range: Inches

B 2 ,500 470 – 658 None

Chosen by cont rac tor S

2 ,500 520 – 752

0 .55

3 ,000 3 ,500 4 ,000 4 ,500 564 – 752 0 .50

Greater than 4 ,500 564 – 800 0 .45

P 4 ,000 564 – 658 None 0 – 4 .5

H High per fo rmance concre te as spec i f ied in p ro jec t spec ia l p rov is ions .

(A) Supplementary Cement i t ious Mater ia l Limitat ions and

Requirements:

Supp lementary cement i t ious mater ia ls ( f l y ash , na tura l pozzo lan , o r s i l i ca fume) conforming to the requ i rements o f Subsec t ion 1006-2 .01 o f the spec i f i ca t ions may be used, as spec i f ied in the paragraphs be low:

(1 ) When Por t land cement is used, a max imum of 25 percent , by we igh t o f the cement i t ious mater ia l , may be an approved f ly ash or na tura l pozzo lan , except as spec i f ied in paragraphs (4 ) , (5 ) , and (6 ) be low;

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(2 ) When Por t land pozzo lan cement [Type lP (MS) ] is used, f l y ash or na tura l pozzolan is no t a l lowed, except as spec i f ied in paragraphs (4 ) , (5 ) , and (6 ) be low;

(3 ) When s i l i ca fume is used, a max imum of 10 percent , by we igh t o f the cement i t ious mater ia ls , may be used;

(4 ) When a compress ive s t rength grea ter than 4 ,500 pounds per square inch is requ i red , supp lementary cement i t ious mater ia ls may be added in excess o f the max imum cement i t ious mater ia l con ten t . F ly ash or na tura l pozzo lan may exceed 25 percent and s i l i ca fume may exceed 10 percent , by we igh t o f the cement i t ious mater ia l , i f approved by the Engineer ;

(5 ) When increased su l fa te res is tance is spec i f ied, the requ i red amount o f f l y ash or na tura l pozzo lan sha l l be incorpora ted in to the concre te and may exceed 25 percent , by we igh t o f the cement i t ious mater ia l ; and

(6 ) For Class S concre te used in b r idge decks , a min imum of 20 percent , by we igh t o f the cement i t ious mater ia l , sha l l be an approved Class F f ly ash or na tura l pozzo lan , un less o therwise approved by the Engineer .

(B) Alka l i -Si l ica React iv i ty Limitat ions and Requirements:

For any concre te mix , other than fo r p recas t or p res t ressed br idge members , wi th a Por t land cement conten t grea ter than 545 pounds per cub ic yard , one o f the op t ions spec i f ied in the paragraphs be low fo r the mi t iga t ion o f a po ten t ia l a lka l i s i l i ca reac t ion (ASR) sha l l be used:

(1 ) A min imum of 20 percent Class F f ly ash or na tura l pozzo lan , by we igh t o f the cement i t ious mater ia l , sha l l be used;

(2 ) Ins tead o f us ing Por t land cement , Type IP (MS) Por t land-pozzo lan cement wi th a Class F f ly ash or na tura l pozzo lan conten t o f a t leas t 20 percent , by we igh t o f the cement i t ious mater ia l , sha l l be used;

(3 ) L imi t the to ta l equ iva len t a lka l ies to a max imum of 3 .00 pounds per cub ic yard o f concre te , when ca lcu la ted as fo l lows:

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(4 ) In t roduce a l i th ium n i t rate admix tu re , wh ich has been approved by the Engineer, a t a min imum dosage o f 0 .55 ga l lons o f 30 percent l i th ium n i t ra te so lu t ion per pound o f to ta l equ iva len t a lka l ies per cub ic yard o f concre te . The requ i red amount o f l i th ium n i t ra te is ca lcu la ted as fo l lows:

(5 ) The coarse aggregate and the f ine aggregate sha l l be tes ted separa te ly in accordance wi th ASTM C1260 to de termine the po ten t ia l fo r a lka l i s i l i ca reac t ion (ASR) . When aggregates show the po ten t ia l fo r ASR, as ind ica ted by expans ions o f 0 .10 percent o r grea ter a t 16 days a f te r cas t ing, su f f ic ien t mi t iga t ion fo r the expans ion sha l l be de termined in accordance wi th ASTM C1567. The use o f f l y ash or natura l pozzo lan may exceed 25 percent , by we igh t o f the cement i t ious mater ia l when used to mi t iga te the po ten t ia l fo r ASR.

(C) Class B and Class S Concrete Slump Limitat ions and Requirements:

The proposed s lump fo r Class B and Class S concre te sha l l be chosen by the cont rac tor . The permiss ib le var ia t ion fo r the proposed s lump sha l l be as spec i f ied in Subsec t ion 1006-7 .03 of the spec i f i ca t ions . Concre te a t the proposed s lump sha l l be su f f ic ien t ly workab le to a l low proper p lacement wi thout harmfu l segregat ion , b leed ing, o r incomple te conso l ida t ion .

(D) High Performance Concrete Limitat ions and Requirements:

For Class H concre te , i f the max imum cement i t ious mater ia l con ten t is exceeded in o rder to achieve h igh ear ly s t rength requ i rements , and i f requ i red by the Engineer , the mix des ign sha l l be accompan ied by shr inkage tes t ing demonst ra t ing tha t shr inkage is less than 0 .04 percent

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when tes ted in accordance wi th ASTM C157. However , the cond i t ion ing per iod sha l l be mod i f ied to cons is t o f an in i t ia l seven day wet cur ing per iod fo l lowed by a 21 day dry cur ing per iod .

(E) Air Entra inment Requirements:

Air -en t ra in ing admix tu res are requ i red fo r a l l c lasses o f concre te p laced a t an e leva t ion o f 3 ,000 fee t o r above and may be used in o ther s i tua t ions a t the cont rac tor ’s d isc re t ion . For a i r -en t ra ined concre te p laced a t an e leva t ion of 3 ,000 fee t o r above, a spec i f i c a i r con ten t ta rge t sha l l be es tab l ished in the mix des ign wi th a va lue wi th in the range o f the appropr ia te cr i te r ia f rom Tab le 1006-10 in Subsec t ion 1006-7 .03 (A) o f the spec i f i ca t ions .

No a i r -en t ra inment wi l l be requ i red fo r minor p recast s t ruc tu res , p recast p ipe , and precas t , p res t ressed s t ruc tu ra l members suppor t ing a concre te deck s lab or imperv ious over lay . A lso , no a i r -en tra inment is requ i red fo r any precas t i tems cons t ruc ted us ing the dry pack or no-s lump method.

(F) Water -Reducing Admixtures:

Unless spec i f ica l ly requ i red , water - reduc ing admix tu res may be used a t the op t ion o f the cont rac tor .

(G) Coarse Aggregate Size Determinat ion:

The coarse aggregate s ize des ignat ion fo r Class S or Class B concre te sha l l be chosen by the cont rac tor and approved by the Engineer and sha l l con form to the s ize des ignat ion and grad ing requ i rements o f AASHTO M 43. In choos ing the s ize des ignat ion , the max imum s ize o f coarse aggregate sha l l not be la rger than 1 /5 o f the nar rowest d imens ion be tween the s ides o f ad jacent fo rms, o r 2 /3 o f the min imum c lear spac ing be tween re in fo rc ing bars , o r 2 /3 o f the min imum c lear spac ing be tween re in fo rc ing bars and the s ides o f ad jacent fo rms, o r 1 /3 o f the depth o f the s lab , wh ichever is leas t . I f two or more s tockp i les a re u t i l i zed to manufac ture an AASHTO M 43 s ize des ignat ion , a t the t ime o f p ropor t ion ing fo r mix ing, the aggregate f rom each s tockp i le sha l l be measured by we igh t and propor t ioned so tha t the resu l t ing mix tu re o f coarse aggregate meets the requ i rements fo r the chosen s ize des ignat ion .

Coarse aggregate fo r Class P concre te used to cons t ruc t Por t land cement concre te pavement wi thout load t rans fer dowels sha l l be separa ted in to two or more s tockp i les . At the t ime o f p ropor t ion ing fo r mix ing, the aggregate f rom each s tockp i le sha l l be measured by we igh t and propor t ioned so tha t the resu l t ing mix tu re o f coarse aggregate meets the requ i rements fo r s ize des ignat ion No. 467, as spec i f ied in AASHTO M 43. Coarse aggregate fo r Class P concre te p laced in pavement ramp tapers no t exceed ing a wid th o f 10 fee t and in pavement gore areas may be s ize des ignat ion No. 57 , as spec i f ied in AASHTO M 43. The use o f

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s ize des ignat ion No. 57 coarse aggregate may be used in concre te p laced in o ther inaccess ib le pavement a reas when approved in wr i t ing by the Engineer .

Coarse aggregate fo r C lass P concre te used to cons t ruc t Por t land cement concre te pavement wi th load t rans fer dowels and ad jacent shou lders sha l l meet the requ i rements fo r s ize des ignat ion No. 57 , as spec i f ied in AASHTO M 43.

1006-3 .02 Mix Design Submit ta l Procedures:

At leas t two weeks pr io r to the appropr ia te concre t ing opera t ion , the cont rac tor sha l l submi t concre te mix des igns to the Engineer fo r rev iew and approva l . More than one mix des ign fo r each c lass o f concre te and each s trength o f Class S concre te may be submi t ted fo r approval p rov ided spec i f i c i tems and loca t ions o f in tended uses accompany each mix des ign . For mix des igns wi thout h is tor ica l da ta in ADOT f i les , the cont rac tor sha l l subs tan t ia te the mix des ign(s ) by fu rn ish ing su f f ic ient mix h is to ry o r t r ia l ba tch tes t ing da ta as spec i f ied in Subsec t ion 1006-3 .03 o f the spec i f i ca t ions and prov id ing a l l de ta i ls o f the mix tu res proposed fo r use . The cont rac tor sha l l submi t a l l mix des igns wi th a separa te cover sheet (s ) wh ich inc ludes the fo l lowing in fo rmat ion :

(A) Cover Sheet :

(1 ) Pro jec t name; (2 ) Pro jec t number ; (3 ) ADOT pro jec t number ; (4 ) Cont rac tor ; (5 ) Subcont rac tor ( i f app l icable ) ; (6 ) Mater ia l supp l ie r ; and (7 ) A l i s t o f the submi t ted mix des igns ident i f ied by produc t

code, des ign s t rength , ba tch p lan t , c lass , and in tended use(s ) .

I f supp l ied by a commerc ia l ready-mix supp l ie r , the ba tch p lan t number and address sha l l be provided on the cover sheet as we l l as the da te o f the most recent ba tch p lan t cer t i f i ca t ion and the name o f the inspec t ing and cer t i fy ing organ iza t ion or agency .

(B) Mix Designer:

Mix des igns sha l l be prepared by or under the d i rect superv is ion o f , and s igned by a person hav ing bo th exper ience in the deve lopment o f mix des igns , inc lud ing the respec t ive type o f concre te , and sa t is fy ing one o f the fo l lowing c r i te r ia :

(1 ) Regis te red Pro fess iona l Engineer ; (2 ) Cer t i f ied Nat iona l Inst i tu te fo r Cer t i f i ca t ion in

Engineer ing Techno logies (NICET) Leve l I I I Techn ic ian or h igher ;

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(3 ) Cer t i f ied Nat iona l Ready Mix Assoc ia t ion (NRMCA) Leve l 3 Concre te Techno logis t ; o r

(4 ) Cer t i f ied Amer ican Concre te Ins t i tu te (ACI) Concre te Labora tory Tes t ing Technic ian Leve l 2 o r Grade I I

Mix des igns fo r p recas t or p res t ressed concre te sha l l be prepared by or under the d i rec t superv is ion o f , and s igned by , a Regis te red Pro fess ional Engineer o r a PCI Qua l i ty Cont ro l Techn ic ian / Inspec tor Leve l I I o r h igher .

(C) Mix Design Submit ta l Requirements:

Concre te mix des igns shal l be propor t ioned on the bas is o f a cub ic yard o f concre te . The complete so l id vo lume mix design(s ) submi t ted fo r approva l sha l l be prov ided to the Engineer by the cont rac tor and sha l l inc lude a l l o f the fo l lowing:

(1 ) Produc t Code; (2 ) ADOT pro jec t number ; (3 ) Plan t Ident i f i ca t ion and Locat ion ; (4 ) Class o f Concre te ; (5 ) Des ign s t rength and age; (6 ) Des ign a i r con ten t and range (±) ; (7 ) Des ign s lump range fo r Class P (as spec i f ied in Tab le

1006-5) or des ign s lump and permiss ib le var ia t ion (as spec i f ied in Subsec t ion 1006-7 .03 o f the spec i f i ca t ions) fo r Class S and Class B concre te ;

(8 ) Des ign spread and permiss ib le var ia t ion fo r se l f -conso l ida t ing concre te (SCC) (as spec i f ied in Subsec t ion 1006-4 .05(E) o f the spec i f i ca t ions) ;

(9 ) Des ign water -cement i t ious mater ia ls ra t io ; (10) Des ign un i t we igh t in pounds per cub ic foo t ; (11) Name and type o f each mater ia l inc lud ing admix tu res and

add i t ives ; (12) Supp l ie r o f each mater ia l inc lud ing admix tu res and

add i t ives ; (13) Source o f cement i t ious mater ia ls , water , and aggregates

inc lud ing the assoc ia ted commerc ia l mater ia ls (CM) source number(s) ;

(14) Weigh t o f each mater ia l measured to the neares t pound; (15) Spec i f ic grav i ty o f each mater ia l (de termined wi th in las t

12 months) to the neares t thousandth ; (16) Vo lume o f each mater ia l measured to the neares t

hundredth o f a cub ic yard; (17) Dosage ra te o f each chemica l admix tu re o r add i t ive o r

manufac turer - recommended dosage range when app l icab le ;

(18) To ta l vo lume measured to the neares t hundredth o f a cub ic yard ;

(19) To ta l we igh t per cub ic yard measured to the neares t pound; and

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(20) Pr in ted name and s ignature o f the ind iv idua l respons ib le fo r deve lopment o f the mix des ign .

A s ingle mix des ign produc t code may inc lude mul t ip le sources of cement , f l y ash , na tura l pozzo lan , and s i l i ca fume. When mul t ip le sources o f mater ia l a re used under one produc t code, documenta t ion sha l l be prov ided wh ich shows s imi la r per fo rmance us ing mater ia ls f rom each source . Mu l t ip le sources o f mater ia l sha l l be l i s ted on the mix des ign as a l te rna t ive sources .

1006-3 .03 Approval of Concrete Mix Designs:

Al l mix des igns sha l l be approved by the Engineer p r io r to use . A l l mix des igns fo r p recas t o r p res t ressed concre te sha l l be approved by the Mater ia ls St ruc tura l Tes t ing Sec t ion pr io r to use . Mix des igns meet ing the c r i te r ia here in and ident i f ied as one o f the fo l lowing wi l l be cons idered fo r approva l :

A mix des ign tha t has been prev ious ly approved or used success fu l ly on an ADOT pro jec t wi th in the pas t 24 months and is on f i le wi th the Depar tment .

A mix des ign s imi la r to tha t spec i f ied tha t has been used success fu l ly on a non-ADOT pro jec t and su f f ic ien t mix h is to ry no o lder than 24 months sha l l be inc luded wi th the mix des ign submi t ta l . The mix h is to ry sha l l inc lude da tes p laced, compress ive s t rength tes t records , and o ther per t inent da ta .

A new mix des ign tha t does no t meet the c r i te r ia fo r a p rev ious ly used mix des ign requ i res a t r ia l ba tch f rom e i ther the f ie ld ba tch p lan t o r an ADOT approved tes t ing labora tory .

In no case sha l l the approva l o f a mix des ign re l ieve the cont rac tor o f the respons ib i l i t y fo r the resu l ts ob ta ined by the use o f such approved mix des ign .

(A) Previously Used Mix Design Approval :

(1 ) Previously Used on ADOT Projects:

Mix tures hav ing been ADOT approved or used prev ious ly wi th sa t is fac tory compress ive s t rength h is to ry wi th in the pas t 24 months may be acceptab le p rov ided a l l o f the fo l lowing app ly :

(a ) The mix code, des ign s lump, and a i r con ten t have no t changed, and the water -cement i t ious mater ia ls ra t io has no t inc reased;

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(b ) The coarse aggregate s ize des ignat ion(s ) and source remain unchanged and the to ta l coarse aggregate quant i ty has no t changed by more than 5 percent ;

(c ) The f ine aggregate source remains unchanged and the quant i ty has no t changed by more than 5 percent ;

(d ) The source and type o f each cement i t ious mater ia l remains unchanged and the quant i ty o f each has no t changed by more than 2 percent ;

(e ) The quant i ty o f water has no t changed by more than 2 percent ;

( f ) Coarse and f ine aggregate spec i f i c grav i t ies have been measured and updated wi th in the las t 12 months ; and

(g) The dosage o f chemica l admix tu res remain wi th in manufac turer ’s recommended ranges.

(2 ) Previously Used on Non-ADOT Projects:

When submi t t ing a concre te mix used success fu l ly on a non-ADOT pro jec t , mix h is to ry sha l l be requ i red fo r cons iderat ion and approva l o f the mix . Us ing s t rength tes t records f rom an ADOT approved labora tory , wh ich are no t more than 24 months o ld , a sample s tandard dev ia t ion (ss) may be used to es tab l ish the requ i red over -des ign . Tes t records sha l l comply wi th the fo l lowing c r i te r ia :

(a ) Representa t ive o f mater ia ls , qua l i ty con t ro l p rocedures , and cond i t ions s imi la r to those expec ted on the pro jec t ;

(b ) Representa t ive o f concre te p roduced to meet a compress ive s t rength , or s t rengths , wi th in 1000 pounds per square inch be low or 1000 pounds per square inch above the spec i f ied des ign compress ive s t rength ;

(c ) Sha l l inc lude the da te , compress ive s t rength , s lump, a i r con ten t (when app l icab le ) , and ca lcu la ted resu l ts f rom Tab le 1006-6 and Tab le 1006-7 ; and

(d ) Cons is t o f a t leas t 15 consecut ive compress ive s t rength tes ts tha t span a per iod o f no t less than 45 days . I f the tes t record cons is ts o f a t leas t 30 consecut ive tes ts , the sample s tandard dev ia t ion (ss ) o f those tes ts is used. I f the tes t record cons is ts o f 15 to 29 consecut ive tes ts , the s tandard dev ia t ion o f

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those tes ts sha l l be mod i f ied in accordance wi th Tab le 1006-6 .

TABLE 1006-6 Standard Deviat ion Modi f icat ion Factor

No. of tests * Modi f icat ion factor for sample standard deviat ion (k )

< 15 Min imum 20% over -des ign 15 1 .16 20 1 .08 25 1 .03

30 or more 1 .00 Note : * For 15 to 29 tes ts , in te rpo la te fo r in te rmed ia te number o f tes ts . k = Mod i f ica t ion fac to r (mu l t ip l ie r ) by wh ich ss sha l l be mul t ip l ied to be used to de termine the requ i red min imum over -des ign compress ive s t rength , f ' c r , in Tab le 1006-7 .

The requ i red min imum over -des ign compress ive s t rength sha l l be de termined by the equat ions shown in Tab le 1006-7 .

Table 1006-7 Over-Design Compressive Strength Equat ions

Speci f ied design compressive strength, ps i

Required minimum over design compressive strength,

ps i

f ' c ≤ 5000

Use the la rger va lue computed f rom these two equat ions :

f ' c r = f ' c + 1 .34k × s s

f ' c r = f ' c + 2 .33k × s s - 500

f ' c > 5000

Use the la rger va lue computed f rom these two equat ions :

f ' c r = f ' c + 1 .34k × s s

f ' c r = 0 .90 f ' c + 2 .33k × s s Legend:

f ' c= Spec i f ied des ign compress ive s t rength .

f ’ c r= Requ i red min imum over -des ign compress ive s t rength

s s= Sample s tandard devia t ion

k= Mod i f ica t ion fac to r f rom Tab le 1006-6 i f app l icab le To be cons idered fo r approva l by the Engineer , the average s t rength o f the prov ided tes t da ta shal l be grea ter than f ’c r , and the mix h is to ry sha l l be f rom a mix deemed to be su f f ic ien t ly representat ive o f the mater ia ls and propor t ions proposed fo r use in the submi t ted mix des ign .

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(B) New Mix Design Approval :

The over -des ign requ i rement fo r new mix des igns sha l l be a min imum of 20 percent o f the spec i f ied des ign compress ive st rength and sha l l be subs tan t ia ted by t r ia l ba tches . Tr ia l ba tch resu l ts may be f rom labora tory t r ia l ba tches or fu l l -sca le t r ia l ba tches .

(1 ) Labora tory t r ia l ba tches are de f ined as “p ropor t iona l ly reduced quant i t ies o f the mater ia ls tha t a re to be used in p roduc t ion , mixed in a por tab le o r labora tory concre te mixer a t an ADOT App roved Labora tory ” . Such t r ia l ba tches sha l l be overseen and ver i f ied by a Pro fess iona l Engineer wi th exper ience in concre te mix des igns .

(2 ) Fu l l -sca le t r ia l ba tches are de f ined as “u t i l i z ing the mater ia ls , mix ing equ ipment , and procedures tha t a re the same as those to be used in p roduc t ion . ” Fu l l -sca le t r ia l ba tches sha l l cons is t o f a t leas t 4 cub ic yards o f concre te and sha l l be overseen and ver i f ied by a Pro fessiona l Engineer wi th exper ience in concre te mix des igns . The Engineer reserves the r igh t to wi tness the fu l l -sca le t r ia l ba tch ac t iv i t ies .

(3 ) Al l t r ia l ba tches fo r precas t o r p res t ressed concre te wi l l be observed, tes ted , and documented by the ADOT Mater ia ls St ruc tura l Tes t ing Sec t ion and approved by the Engineer .

Tr ia l ba tches sha l l have s lump resu l ts wi th in the range spec i f ied fo r the proposed work . When a i r -en t ra ined concre te is spec i f ied , the a i r con ten t sha l l be in compl iance wi th the spec i f ied requ i rements . Compress ive s t rength tes t ing samples sha l l be cured and tes ted by an ADOT Approved Labora tory .

Tr ia l ba tch tes t resu l ts , p r io r to the spec i f ied compress ive s trength acceptance age, may be used fo r ear ly approva l i f the compress ive s t rength tes t resu l ts meet the min imum over -des ign requ i rement fo r the spec i f ied acceptance age.

When approved by the Engineer , concre te f rom t r ia l ba tches may be used in the work a t loca t ions where concre te o f a lower s t rength is requ i red and such concrete sha l l meet the requ i rements o f the c lass o f concre te a t tha t loca t ion .

1006-4 Concrete Product ion:

1006-4 .01 Genera l Requirements:

The cont rac tor may ob ta in concre te fo r each c lass o f concre te and fo r each s t rength o f Class S concre te f rom a source approved by the Engineer in l ieu o f es tab l ish ing a ba tch p lan t a t the pro jec t s i te .

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1006-4 .02 Measur ing Mater ia ls :

(A) Cement i t ious Mater ia l :

Cement i t ious mater ia l sha l l be measured by we igh t . When supp lementary cement i t ious mater ia ls a re used in the concre te mix tu res , the cumula t ive we igh t is permi t ted to be measured wi th hydrau l ic cement , and on a sca le wh ich is separa te and d is t inc t f rom those used fo r o ther mater ia ls . The we igh t o f the hydraul ic cement sha l l be measured be fore supp lementary cement i t ious mater ia ls . When the quant i ty o f cement i t ious mater ia l exceeds 30 percent o f the fu l l capac i ty o f the sca le , the measured quant i ty o f the hydrau l ic cement sha l l be wi th in 1 percent o f the requ i red we igh t , and the cumula t ive measured quant i ty o f hydrau l ic cement p lus supp lementary cement i t ious mater ia ls sha l l a lso be wi th in 1 percent o f the requ i red cumula t ive we igh t a t each in te rmed ia te we igh ing. For smal le r ba tches o f less than 30 percent of the fu l l capac i ty o f the sca le , the measured quant i ty o f the hydrau l ic cement and the measured cumula t ive quant i ty o f hydrau l ic cement p lus supp lementary cement i t ious mater ia ls used sha l l no t be less than the requ i red amount o r more than 4 percent in excess o f the requ i red amount . In spec i f ic cases, cement i t ious mater ia ls in bags may be used wi th p r io r approva l o f the Engineer .

(B) Water :

Mix ing water is de f ined as the to ta l amount o f water in a ba tch less the water absorbed by the aggregates and is used to ca lcu la te the water -cement i t ious mater ia ls rat io (w/cm) . Mix ing water sha l l cons is t o f ba tch water (water we ighed or metered a t the p lan t ) , i ce, f ree mois tu re on the aggregates , wash water re ta ined in the mixer be fore ba tch ing, and water added a t the jobs i te in accordance wi th Subsec t ion 1006-7 .03 o f the spec i f i ca t ions . The ba tch water sha l l be measured by mass or vo lume to an accuracy o f ± 1 .5 percent o f the ta rge t ba tch water . I f the quant i ty o f water in t roduced f rom admix tu res inc reases the water -cement i t ious mater ia ls ra t io by more than 0 .01 , i t sha l l a lso be inc luded in the to ta l amount o f mix ing water . In the case o f t ruck mixers , any wash water re ta ined in the drum fo r use in the nex t ba tch o f concre te sha l l be measured; i f th is p roves imprac t ica l the wash water sha l l be d ischarged be fore load ing the nex t ba tch o f concre te . The to ta l quant i ty o f mix ing water sha l l no t exceed the mix des ign ta rge t quant i ty by more than 3 percent .

(C) Aggregates:

Aggregate sha l l be measured by we igh t . The quant i ty o f aggregate we ighed sha l l be the requi red dry we igh t p lus the to ta l mo is tu re conten t (absorbed and sur face) o f the aggregate .

When aggregates are measured in an ind iv idua l o r cumula t ive we igh ba tcher and the requ i red we igh t o f aggregate is equa l to o r grea ter than 30 percent o f the sca le capac i ty , the to ta l quant i ty o f aggregate sha l l be wi th in 2 percent o f the requ i red we igh t . In add i t ion , i f a cumula t ive we igh

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ba tcher is used, the quant i ty o f aggregate a t each success ive we igh ing sha l l be wi th in 2 percent o f the requ i red we igh t .

When aggregates are measured in ind iv idua l o r cumula t ive we igh ba tchers , and the requ i red in te rmed ia te o r f ina l we igh t is less than 30 percent o f the sca le capac i ty , the aggregate we igh t sha l l be wi th in 3 percent o f the requ i red we igh t .

(D) Admixtures and Addi t ives:

Chemica l admix tu res in powdered fo rm or o ther add i t ives in so l id fo rm (such as f ibers o r co lo r ) sha l l be measured by we igh t . L iqu id chemica l admix tu res sha l l be ba tched by we igh t o r vo lume. Admix tu res measured by e i ther we igh t o r vo lume, sha l l be ba tched wi th an accuracy o f ± 3 percent o f the to ta l requi red amount . For l iqu id chemica l admix tu res , d ispensers o f a mechan ica l type capab le o f ad jus tment fo r var ia t ion o f dosage, and o f s imp le ca l ib ra t ion , a re requ i red , un less approved by the Engineer .

1006-4 .03 Batching of Concrete:

(A) Genera l Requirements:

Concre te may be ba tched in a s tandard ba tch p lant o r a cent ra l mix ing p lan t . The p lan t may be s i tua ted a t the pro jec t s i te , o r i t may be loca ted o f f -s i te o r a t a commerc ia l supp l ie r . A l l mater ia ls u t i l i zed in the ba tch ing o f concre te sha l l be f rom an approved source or supp l ie r .

(B) Concrete Plant Requirements:

(1 ) Al l Concrete Plants:

The hand l ing and s to rage o f concre te aggregate sha l l be such as to ma in ta in them a t o r above a sa tura ted-sur face-dry (SSD) mois tu re cond i t ion and to min imize segregat ion or the in te rmix ing and contaminat ion wi th fo re ign mater ia ls . The Engineer may requ i re tha t aggregate be s to red separa te ly . Di f fe ren t s izes of aggregate sha l l be separa ted by bu lkheads or s to red in separa te s tockp i les su f f ic ien t ly removed f rom each o ther to p revent the mater ia ls f rom becoming in te rmixed. When aggregates are s to red on the ground, the s i tes fo r the s tockp i les sha l l be leve l and c lear o f a l l vegeta t ion . The bo t tom 1 foo t layer o f aggregate sha l l no t be d is turbed or used.

A l l concre te ba tch p lan ts and ba tch ing opera t ions sha l l have been inspec ted and sa t is fy app l icab le c r i te r ia be fore be ing used to p roduce concre te . As an a l terna t ive to an ADOT inspec t ion o f the concre te ba tch p lan ts and ba tch ing opera t ions , the supp l ie r may submi t cer t i f i ca t ion of the i r concre te p roduc t ion fac i l i t ies f rom NRMCA or Ar izona Rock Produc ts Assoc ia t ion (ARPA) to the Engineer . Concre te ba tch p lan ts sha l l be inspec ted a min imum of once every two years . ADOT may inspec t concre te ba tch p lan ts a t any t ime.

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Each ba tch p lan t sha l l be equ ipped to cont ro l the t ime when the water en ters the mixer dur ing the mix ing cyc le . Batch and mix ing t ime sha l l be ca lcu la ted f rom the t ime cement i t ious mater ia l i s f i rs t combined wi th water o r aggregates .

(2 ) Project Speci f ic Plants for Class P Concrete:

The hand l ing and s to rage o f concre te aggregate fo r Class P concre te a t the job s i te o r a p ro jec t spec i f i c p lan t s i te sha l l be such as to min imize segregat ion . Stockp i les sha l l be neat and regu la r in fo rm and sha l l occupy as smal l an area as poss ib le .

Contaminat ion o f concre te aggregate fo r Class P concre te by contac t wi th the ground a t the job s i te sha l l be prevented . The cont rac tor sha l l take the necessary measures to prevent such contaminat ion . Such prevent ive measures inc lude p lac ing aggregate on hardened sur faces cons is t ing o f Por t land cement concre te , aspha l t ic concre te , o r cement t rea ted mater ia l .

The cont rac tor sha l l ma inta in a t leas t two fu l l days’ wor th o f p roduc t ion o f f ine and coarse aggregate s tockp i led a t the batch p lan t fo r Class P concre te p r io r to s ta r t ing and th roughout the dura t ion o f Por t land cement concre te pav ing opera t ions . Th is requ i rement is waived fo r the las t two days o f p roduc t ion .

(C) Concrete Plant Operat ion and Documentat ion:

Concre te ba tch p lan ts sha l l be opera ted in accordance wi th the manufac turer ’s gu ide l ines and recommendat ions . The amount o f mater ia l measured fo r each ba tch o f concre te sha l l no t exceed the p lan t ’s ra ted capac i ty . A record o f cer t i f i ca t ion cur ren t to wi th in the last s ix months fo r a l l sca les , ba lances , load ce l ls , o r water measur ing sys tems used in the produc t ion o f concre te sha l l be main ta ined a t the ba tch p lan t and sha l l be made ava i lab le to the Engineer upon request .

When requested by the Engineer , the cont rac tor sha l l supp ly a separa te record fo r each ba tch o f concre te wh ich shows the ba tch we igh t o r quant i ty o f each ind iv idua l ingred ien t . The amount o f water in t roduced in to the ba tch inc lud ing tha t con ta ined on the aggregate sha l l be ver i f iab le .

(D) Concrete T icket ing Systems:

For each c lass o f concre te and each s t rength o f Class S concre te , except fo r Class P concre te p roduced in a ba tch p lan t a t the pro jec t s i te and used exc lus ive ly fo r Class P work , the cont rac tor sha l l fu rn ish a de l ivery t i cke t fo r each ba tch o f concre te , inc lud ing any t r ia l ba tches . The min imum in fo rmat ion to be shown on each de l ivery t i cke t sha l l be :

(1 ) Date ; (2 ) T ime batched;

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(3 ) Truck ident i f i ca t ion number ; (4 ) Name or ident i f i ca t ion o f ba tch p lan t ; (5 ) Name o f con t rac tor ; (6 ) Name and loca t ion o f p ro jec t ; (7 ) Quant i ty o f concre te ; (8 ) Mix des ign produc t code; and (9 ) Amount o f permiss ib le add i t iona l water to meet the

des ign water -cement i t ious mater ia l ra t io

Any manua l ly added add i t ives or admix tu res prev ious ly approved by the Engineer to be added to an ex is t ing mix des ign , wh ich cannot go th rough the p lan t o r ba tch ing sys tem, sha l l be recorded and shown on the de l ivery t i cke t .

In add i t ion , the number o f revo lu t ions tha t the concre te has been mixed a t mix ing speed in a t ruck mixer sha l l be no ted on the de l ivery t i cke t .

An au thor ized representat ive o f the cont rac tor shal l be respons ib le for each de l ivery t i cke t and sha l l s ign each de l ivery t i cke t accept ing the cont rac tor 's respons ib i l i ty fo r the concre te . The representa t ive sha l l fu rn ish a copy o f the de l ivery t i cke t to the Engineer a f te r d ischarge o f the concre te is comple te .

1006-4 .04 Mix ing and Transport of Concrete:

(A) Genera l Requirements:

Al l concre te sha l l be homogeneous and thorough ly mixed, and there sha l l be no lumps or ev idence o f un-d ispersed cement . Equ ipment hav ing components made o f a luminum or magnes ium a l loys , wh ich wou ld have contac t wi th p las t ic concre te dur ing mix ing and t ranspor t ing, sha l l no t be used.

(B) Mix ing in a Stat ionary Mixer (Centra l Mix Plant or Drum Mix Plant ) :

The vo lume o f concre te mixed per ba tch sha l l no t exceed the capac i ty o f the mixer as shown on the manufac turer 's p la te or documenta t ion . No sp i l lage o f concre te is a l lowed dur ing the process o f mix ing.

Whi le mix ing, the mixer sha l l be opera ted a t the speed shown on the manufac turer 's p la te as the mix ing speed.

The mix ing t ime sha l l no t be less than 60 seconds per ba tch fo r Class P concre te and the mix ing t ime sha l l be inc reased i f d i rec ted by the Engineer . The mix ing t ime sha l l be no t less than 60 seconds fo r 1 cub ic yard and sha l l be inc reased 15 seconds fo r each add i t iona l cub ic yard or f rac t ion thereo f fo r Class S or Class B concre te .

The mixer sha l l have an au tomat ic t iming dev ice wh ich locks the d ischarge equ ipment un t i l the requ i red mix ing t ime has been comple ted .

SECTION 1006

1170

The mixer sha l l be opera t ing a t mix ing speed a t the t ime tha t a l l ingred ien ts en ter the mixer to ensure the immedia te beginn ing o f the mix ing cyc le . Mix ing t ime sha l l end when the d ischarge chute opens. The conten ts o f the mixer sha l l be comple te ly d ischarged be fore the succeed ing ba tch is p laced in the mixer .

Any concre te d ischarged be fore the mix ing t ime is comple ted sha l l be d isposed o f by the cont rac tor a t no add i t iona l cos t to the Depar tment .

Cent ra l mixers sha l l be equ ipped wi th au tomat ic ba tch meters for count ing the ba tches fo r Class P concre te . The cont rac tor sha l l fu rn ish the ba tch count da i ly to the Engineer .

In the case o f mix ing in a centra l mixer , when f ibers a re incorpora ted in to the concre te , mix ing t ime and revo lu t ion ra te is per fo rmed the same way as p la in concre te because there is su f f ic ient shear p rov ided to un i fo rmly d isperse the f ibers . A tes t o r t r ia l mix ing is a lways recommended to ensure tha t the mix tu re suppor ts the f iber type and dosage and tha t there are no prob lems wi th the ba tch ing sequence.

Mixed concre te sha l l be t ranspor ted in t ruck mixers , t ruck agi ta to rs o r in non-agi ta t ing t rucks .

When t ruck mixers o r t ruck agi ta to rs a re used, the concre te sha l l be cont inuous ly agi ta ted f rom the t ime o f load ing un t i l the t ime o f d ischarge. Agi ta t ion sha l l be by ro ta t ion o f the drum a t the speed shown on the manufac turer 's p la te as agi ta t ing speed. The t ruck mixer o r t ruck agi ta to r sha l l be loaded and opera ted wi th in a capac i ty no t to exceed 80 percent o f the gross vo lume o f the drum. The ra te o f d ischarge sha l l be cont ro l led by the speed o f ro ta t ion o f the drum in the d ischarge d i rec t ion wi th the d ischarge ga te fu l ly opened.

Bod ies o f non-agi ta t ing t rucks sha l l be smooth , mor ta r - t igh t , meta l con ta iners and sha l l be capab le o f d ischarging the concre te a t a sa t is fac tory cont ro l led ra te wi thout segregat ion . I f d ischarge o f concre te is accompl ished by t i l t ing the body , the sur face o f the load sha l l be re ta rded by a su i tab le ba f f le . Covers sha l l be prov ided when needed for p ro tec t ion .

Discharge f rom non-agi ta t ing t rucks sha l l be comple ted wi th in 45 minu tes f rom the t ime concre te is ba tched.

Concre te hau led in open- top veh ic les sha l l be pro tec ted aga ins t ra in . When the ambien t tempera ture exceeds 85 degrees F the concre te sha l l be covered i f i t cou ld be exposed to the sun fo r more than 30 minu tes .

(C) Mix ing in Truck Mixers:

Al l concre te t ruck mixers sha l l be inspec ted and sa t is fy app l icab le c r i te r ia be fore be ing used to mix and de l iver concrete . As an a l te rna t ive to the annua l ADOT inspec t ion o f t ruck mixers , the t rucks may be

SECTION 1006

1171

inspec ted in accordance wi th the requ i rements o f the NRMCA and/or ARPA inspec t ion programs. Such inspec t ions sha l l be per formed in accordance wi th NRMCA’s “Sec t ion 5 o f Qua l i ty Cont ro l Manua l , Sec t ion 3 , Inspec t ion & Cer t i f i ca t ion o f De l ivery Veh ic les” or ARPA’s “Cer t i f i ca t ion o f Ready Mixed De l ivery F lee t ” check l is t and gu ide l ine. Upon sa t is fac to ry complet ion o f inspec t ion , an inspec t ion s t icker sha l l be app l ied in a c lear ly v is ib le loca t ion to the ins ide o f the dr iver ’s s ide door o f the t ruck , o r an NRMCA card sha l l be read i ly ava i lab le . Truck mixers tha t do no t have a va l id NRMCA card , o r ADOT or ARPA s t icker ind ica t ing the da te o f inspec t ion are no t a l lowed to supp ly concre te to ADOT pro jec ts . Truck mixers sha l l be inspec ted annua l ly a t a min imum and may be inspec ted a t any t ime.

Each mixer sha l l meet the spec i f ied requ i rements fo r type and s ize and sha l l have a t tached in a prominent p lace a manufacturer 's p la te showing the gross vo lume o f the mixer and the recommended speeds o f the mixer fo r mix ing and fo r agi ta t ing. Truck mixers sha l l be opera ted wi th in a capac i ty no t to exceed 63 percent o f the gross vo lume o f the drum and a t speeds shown on the manufac turer 's p la te as mix ing and agi ta t ing speeds.

Truck mixers sha l l be equ ipped wi th an e lec t r ica l ly o r mechan ica l ly ac t iva ted revo lu t ion counter by wh ich the number o f d rum revo lu t ions may be ver i f ied . The counter sha l l accura te ly regis te r the number of revo lu t ions . I t sha l l be mounted on the t ruck mixer o r ins ide the t ruck cab, so tha t i t may be sa fe ly and conven ien t ly read. The revo lu t ion counter sha l l be rese t to zero a f te r a l l mater ia ls have been loaded in to the drum a t the p lan t .

Truck-mixed concre te shal l be mixed en t i re ly in the t ruck mixer . Mix ing sha l l begin a f te r the cement has been combined wi th e i ther the aggregate or water . Each ba tch o f concre te sha l l be mixed fo r no t less than 70 nor more than 100 revo lu t ions o f the drum, a t mix ing speed, a f te r a l l mater ia ls have been loaded in to the drum a t the p lan t , except tha t when approved by the Engineer , the max imum of 100 revo lu t ions may be inc reased. Any revo lv ing o f the drum beyond the max imum number o f revo lu t ions shal l be a t the agi ta t ing speed.

When f ibers a re incorpora ted in to the concre te , i t i s recommended to add the f ibers in a cont inuous manner . A mix ing speed o f 10 to 12 rpm is typ ica l ly used fo r the ra te o f add i t ion in t rucks . A min imum of 40 revo lu t ions ( four to f i ve minu tes) a f te r a l l the f ibers a re added is recommended fo r p roper mix ing and d ispers ion o f f ibers in t rucks .

Mixers sha l l be c leaned a t su i tab le in te rva ls . Water used fo r c lean ing the mixer sha l l be d ischarged pr io r to fu r ther ba tch ing.

(D) Mix ing in Volumetr ic Mixers:

Concre te mix ing in vo lumet r ic mixers fo r Class S or Class B concre te sha l l be per fo rmed in accordance wi th the requ i rements o f ASTM C685.

SECTION 1006

1172

1006-4 .05 Manufactur ing Precast I tems:

(A) Genera l :

Manufac turers p roposed by the cont rac tor to manufac ture precas t i tems sha l l be on the “Approved Precas t Concre te Produc ts Manufac turers L is t ” o r the “Approved Precas t /Pres t ressed Br idge Members Manufac turers L is t ” on the St ruc tura l Mater ia ls Tes t ing Sec t ion webs i te . On ly the manufac turers on the approved l i s t (s) sha l l manufac ture precas t concre te p roduc ts o r p recas t b r idge members fo r ADOT cons t ruc t ion pro jec ts .

(B) Schedul ing:

Shop drawings sha l l be submi t ted and approved as requ i red in Subsec t ion 105.03 o f the spec i f i ca t ions . The rev iewer sha l l no ta te the i r fu l l f i rs t and las t name and contac t phone number on the approved shop drawings . The cont rac tor sha l l submi t a copy o f the approved shop drawings to the St ruc tura l Mater ia ls Tes t ing Sec t ion a t leas t f i ve work ing days in advance o f the s ta r t o f p roduc t ion o f the precas t i tems. Any changes to shop drawings must be approved by the Engineer . These updated and approved shop drawings sha l l be sent to the St ruc tura l Mater ia ls Tes t ing Sec t ion a t leas t 24 hours in advance o f the s ta r t of p roduc t ion .

(C) Plant and Personnel Cert i f icat ions:

Al l p recas t b r idge members sha l l be manufac tured in a p lan t cer t i f ied by the Precas t /Pres t ress Concre te Ins t i tu te (PCI) . The manufac turer sha l l be , a t a min imum, cer t i f ied fo r Produc t Group “B” - Br idge Produc ts , Category B4. Erec t ion of p recas t /p res t ress br idge members sha l l be per fo rmed by a cont rac tor , manufac tur ing p lan t , o r e rec tor wh ich has an ind iv idua l on s ta f f who has a t tended and rece ived a “Cer t i f i ca t ion o f Comple t ion” f rom the PCI “ Indus t ry Erec t ion Standards Schoo l ” o r is cer t i f ied by PCI as a “Cert i f ied Fie ld Aud i to r ” .

A l l p recas t concre te p roduc ts , o ther than concre te p ipe , sha l l be manufac tured in a p lan t cer t i f ied by the Nat iona l Precas t Concre te Assoc ia t ion (NPCA) or PCI .

A l l p recas t concre te p ipe produc ts and precas t concre te box cu lver ts sha l l be manufac tured in a p lan t cer t i f ied by the Amer ican Concre te Pipe Assoc ia t ion (ACPA) or NPCA.

Al l p lan t cer t i f i ca t ions sha l l be main ta ined throughout the produc t ion o f a l l p recas t concre te i tems. Produc t ion fo r p ro jec ts sha l l s top immedia te ly i f a t any t ime the manufac turer ’s cer t i f i ca t ion is revoked, regard less o f the s ta tus o f comple t ion o f con t rac ted work . Produc t ion sha l l no t p roceed un t i l cer t i f i ca t ion has been re -es tab l ished.

SECTION 1006

1173

Each p lan t reques t ing to be added to the “Approved Precas t Concre te Produc ts Manufac turers L is t ” o r the “Approved Precas t /Pres t ressed Br idge Members Manufac turers L is t ” sha l l do so in wr i t ing to the St ruc tura l Mater ia ls Tes t ing Sec t ion . The request sha l l inc lude a copy o f the compl iance cer t i f ica te issued by the ACPA, NPCA, o r PCI , a copy o f the most recent aud i t conducted in accordance wi th the ACPA, NPCA, o r PCI cer t i f i ca t ion programs, a copy o f the response to de f ic ienc ies o f the aud i t upon request , a copy o f the Qua l i ty Sys tem Manua l (QSM), and the des ignated Qua l i ty Cont ro l (QC) Manager fo r the p lan t .

The cont rac tor sha l l p rovide documenta t ion to the St ruc tura l Mater ia ls Tes t ing Sec t ion fo r any changes to the manufac turer ’s QSM, cer t i f ied personne l , o r p lan t cer t i f i ca t ions wi th in 10 days o f the respec t ive change.

The QSM sha l l con ta in , a t a min imum, the methods o f p roduc t ion and qua l i ty con t ro l po l ic ies and procedures used by the p lan t . The QSM sha l l be in accordance wi th ACPA, NPCA, o r PCI Plan t Cer t i f i ca t ion requ i rements and the i r respec t ive programs.

Each manufac turer on the “Approved Precas t Concre te Produc ts Manufac turers L is t ” o r the “Approved Precast /Pres t ressed Br idge Members Manufac turers L is t ” i s requ i red to submi t to the St ruc tura l Mater ia ls Tes t ing Sec t ion , a copy o f the annua l aud i t and the response to de f ic ienc ies o f the audi t , i f app l icab le , to ver i fy compl iance wi th the ACPA, NPCA, o r PCI cer t i f i ca t ion programs.

I f an aud i t i s no t comple ted or aud i t documents a re no t submi t ted wi th in a per iod o f 16 months o f the las t aud i t da te , the p lan t wi l l be removed f rom the approved l i s t fo r a min imum of two months . Af te r the two months , the manufac turer can app ly to have the p lan t re ins ta ted to the approved l i s t . Re ins ta tement is sub jec t to rev iew and compl iance wi th the St ruc tura l Mater ia ls Tes t ing Sec t ion .

In the event o f a change in ownersh ip o f an approved manufac turer , the manufac turer sha l l no t i fy St ruc tura l Mater ia ls Tes t ing Sec t ion o f the change in ownersh ip a min imum of 30 days pr io r to the da te a t wh ich the change o f ownersh ip takes e f fec t . Approva l wi l l expi re i f the Depar tment is no t no t i f ied o f the change in ownersh ip . The new ownersh ip may avo id exp i ra t ion by submi t t ing a s ta tement to the St ruc tura l Mater ia ls Tes t ing Sec t ion ind ica t ing recogn i t ion o f the de ta i ls o f the approval requ i rements , any changes to personne l and cer t i f i ca t ions , and ver i f i ca t ion tha t the p lan t is in accordance wi th the ACPA, NPCA or PCI cer t i f i ca t ion program requ i rements .

The Engineer may conduct annua l aud i ts on a random bas is o f each approved precas t manufac turer .

For p recas t concre te p roduc ts , the manufac turer sha l l have e i ther a Regis te red Pro fess iona l Engineer o r a QC Manager who has a t leas t one o f the fo l lowing cer t i f i ca t ions :

SECTION 1006

1174

(1 ) PCI QC Leve l I I ; (2 ) NPCA Produc t ion & Qua l i ty Schoo l (PQS) Leve l I I QA/QC

and Produc t ion ; o r (3 ) ACPA Q-schoo l .

For p recas t b r idge members , the manufac turer sha l l have a Regis te red Pro fess iona l Engineer o r QC Manager who is cer t i f ied by PCI as QC Leve l I I o r h igher . In add i t ion , the QC Manager sha l l be cer t i f ied , o r have a techn ic ian(s ) per fo rming QC tes t ing, as an ACI Concre te F ie ld Tes t ing Techn ic ian Grade I and ACI Concre te St rength Tes t ing Techn ic ian Grade I .

In the event o f a change in QC Manager o r cer t i f ied QC Techn ic ian , the manufac turer sha l l no t i fy the St ruc tura l Mater ia ls Tes t ing Sec t ion o f the change wi th in 30 days . Fa i lu re to no t i fy the Depar tment o f the change wi l l resu l t in the exp i ra t ion o f the approva l . Exp i ra t ion may be avo ided by no t i fy ing the St ruc tura l Mater ia ls Tes t ing Sec t ion o f any changes to personne l and inc lude thei r cer t i f i ca t ions , and ver i f i ca t ion tha t the p lant is in accordance wi th the ACPA, NPCA or PCI cer t i f i ca t ion program requ i rements .

(D) Plant Qual i ty Control :

The cont rac tor sha l l submi t the concre te mix des ign(s ) a long wi th shop drawings to the St ruc tura l Mater ia ls Tes t ing Sec t ion fo r approva l .

The shop drawings sha l l con ta in a t the min imum:

(1 ) Concre te s t rength requ i rements ; (2 ) Method o f concre te p lacement ; (3 ) Method o f concre te v ib ra t ion ; (4 ) Method o f cur ing; (5 ) Tens ion ing method and ca lcu la t ions , inc lud ing s t ress ing

jacks and pumps, gauge pressure va lues and theore t ica l e longat ions ;

(6 ) Detens ion ing method; (7 ) Concre te f in ish ing requ i rements and method o f f in ish ing;

and (8 ) Storage method.

When Requests fo r In fo rmat ion (RFI ) a re submi t ted to the Engineer , a copy o f the RFI sha l l a l so be submi t ted to the St ruc tura l Mater ia ls Tes t ing Sec t ion .

The manufac turer sha l l fabr ica te concre te tes t cy l inders fo r each produc t , s t rength requ i rement , and mix des ign per each day o f p roduc t ion . When “d ry cas t ” o r “zero s lump” concre te is used, the concre te tes t cy l inders wi l l be fabr ica ted per ASTM C497. For “wet cas t ” concre te , the concre te tes t cy l inders wi l l be fabr ica ted per AASHTO T 23 . When “Se l f Conso l i da t ing Concre te” (SCC) i s used, the concre te tes t cy l inders sha l l be fabr ica ted , and un i t we igh t and a i r con ten t tes ts

SECTION 1006

1175

sha l l be per fo rmed as descr ibed in Subsec t ion 1006-4 .05 (E) o f the spec i f i ca t ions .

Re lease s t rength sha l l be met p r io r to de tens ion ing. At the d isc re t ion o f the Engineer , re lease s t rength tes t ing may be per fo rmed a t the p lan t under the observa t ion o f the Engineer , i f no t per fo rmed by the Engineer .

Concre te tes t resu l ts sha l l be made ava i lab le upon request .

(E) Precast Concrete Operat ions:

When requested , the precas t manufac turer sha l l supp ly a month ly concre te compress ive s trength repor t , wh ich conta ins the fo l lowing in fo rmat ion :

Da i ly average concre te compress ive s t rength ;

Month ly average concre te compress ive s t rengths , wi th the h igh tes t resu l t , the low tes t resu l t , and the s tandard dev ia t ion o f concre te compress ive s t rength resu l ts ;

Week ly aggregate gradat ion and sand equ iva lent tes t resu l ts ; and

For SCC, resu l ts o f “Co lumn Segregat ion Tes t ” , when requested by the Engineer .

(1 ) Precast Br idge Members Concrete Operat ions:

Concre te mix des igns sha l l be submi t ted and comply wi th the requ i rements o f Subsec t ion 1006-3 .01 o f the spec i f i ca t ions , and the requ i rements l i s ted here in . Ca l ib ra t ion repor ts for ba tch p lan ts sca les and measur ing dev ices sha l l be supp l ied to the Engineer upon request .

A l l concre te used in the produc t ion o f p recas t b r idge members a t the manufac turer ’s p lan t o r purchased f rom a Ready Mix supp l ie r sha l l be ba tched wi th load ce l l ind ica t ing dev ices prov id ing a d ig i ta l readout and pr in ted we igh ts . Pr in ted cop ies sha l l be ava i lab le upon request by the Engineer .

The ra te o f concre te p lacement and conso l ida t ion sha l l be such tha t the fo rmat ion o f co ld jo in ts wi th in mono l i th ic sec t ions of any br idge member sha l l no t occur , bu t a t no t ime sha l l concre te p lacement be less than 25 cub ic yards per hour .

When conso l ida t ing concre te tha t inc ludes epoxy coated re in fo rcement wh ich requ i res v ib ra t ion dur ing p lacement , methods o f v ib ra t ion sha l l be equ ipped wi th neoprene or rubber boots o r l i ke mater ia l tha t p ro tec ts the epoxy coat ings f rom damage and/or abras ion .

SECTION 1006

1176

When concre te p lacement is in te rrup ted by ra in, the fo rms sha l l be covered wi th ta rps or p last ic . I f i t i s de termined tha t concre te p lacement can proceed dur ing ra in , ta rps or p las t ic sha l l be used to cover the forms ahead o f and beh ind the concre te p lacement .

(2 ) Precast Concrete Products Concrete Operat ions:

Cal ib ra t ion repor ts fo r batch p lan t sca les and measur ing dev ices sha l l be supp l ied to the St ruc tura l Mater ia ls Tes t ing Sec t ion when requested. Each precas t p lan t sha l l submi t a “Hot Weather ” and/or a “Co ld Weather ” concre te ba tch ing and p lacement p lan wh ich addresses the s teps tha t wi l l be taken to ensure concre te tempera ture and cur ing meets the spec i f i ca t ions . The p lan sha l l spec i fy p rocedures de ta i l ing how the concre te tempera ture wi l l be mon i to red th roughout each day ’s p roduc t ion . The St ruc tura l Mater ia ls Tes t ing Sec t ion may tes t concre te tempera ture a t any t ime. Concre te fa i l ing to meet the spec i f i ca t ion wi l l be re jec ted a long wi th any precas t p roduc ts produced tha t day .

The precas t manufac turer sha l l supp ly annua l tes t resu l ts fo r aggregate as requ i red per ASTM C33, and a lso an annual absorp t ion tes t on manufac tured produc ts .

A l l concre te ba tched a t the manufac turer ’s p lan t , o r purchased f rom a ready mix supp l ie r , sha l l be ba tched wi th load cel l ind ica t ing dev ices prov id ing a d ig i ta l readout and pr in ted we igh ts. Cop ies sha l l be ava i lab le when requested by the St ruc tura l Mater ia ls Tes t ing Sec t ion .

The ra te o f concre te p lacement and conso l ida t ion sha l l be such tha t the fo rmat ion o f co ld jo in ts wi th in mono l i th ic sec t ions wi l l no t occur .

When conso l ida t ing concre te tha t inc ludes epoxy coated re in fo rcement wh ich requ i res v ib ra t ion dur ing p lacement , methods o f v ib ra t ion sha l l be equ ipped wi th neoprene or rubber boots o r l i ke mater ia l tha t p ro tec ts the epoxy coat ings f rom damage and/or abras ion .

When a s t r ipp ing s t rength is spec i f ied , the manufacturer may de termine the concre te s t rength us ing Ar izona Tes t Method 318, “Es t imat ing the Deve lopment o f Concre te St rength by Matur i ty Method. ”

When concre te p lacement is in te rrup ted by ra in, the fo rms sha l l be covered wi th ta rps or p last ic . I f i t i s de termined tha t concre te p lacement can proceed dur ing ra in , ta rps or p las t ic sha l l be used to cover the forms ahead o f and beh ind the concre te p lacement .

(3 ) Sel f Consol idat ing Concrete (SCC):

SCC sha l l be f lowab le under i ts own we igh t and comple te ly f i l l the fo rmwork , even in the presence o f dense re in fo rcement , wi thout the need o f any v ib ra t ion , wh i le ma in ta in ing homogene i ty . P lacement is to be accompl ished in one l i f t , w i th the p lacement equ ipment wi th in 25 fee t o f the ro l l ing edge tha t the SCC crea tes .

SECTION 1006

1177

Tr ia l mixes sha l l be observed by an ADOT representa t ive . Tr ia l mixes may inc lude an inver ted s lump spread tes t in accordance wi th ASTM C1611, L -box , J -box , J - r ing, Co lumn Segregat ion Tes t , o r o ther tes ts as deemed necessary by the Engineer fo r the concre te mix approva l . In add i t ion , the fo l lowing is requ i red :

(a ) The v isua l s tab i l i t y index (VSI ) , per fo rmed in accordance wi th ASTM C1611, sha l l be de termined fo r each precas t concre te p roduc t be ing produced;

(b ) Any v iscos i ty mod i fy ing agents (VMA) sha l l be ident i f ied fo r the mix tu re ; and

(c ) The spread sha l l be wi th in ± 3 inches o f the des ign spread de f ined in the mix des ign .

Concre te s t rength tes t cy l inders sha l l be fabr ica ted in accordance wi th ASTM C31, bu t f i l l ing the molds sha l l be done in accordance wi th ASTM C1758.

Concre te un i t we igh t and a i r con ten t tes ts sha l l be per fo rmed in accordance wi th ASTM C138 and ASTM C231, respec t ive ly , bu t f i l l ing the cy l inder mo lds sha l l be done in accordance wi th ASTM C1758.

1006-5 Weather and Placement Limitat ions:

1006-5 .01 Genera l Requirements:

Concre te sha l l no t be p laced dur ing adverse cond i t ions , wh ich may inc lude bu t a re no t l imi ted to ra in , snow, f reez ing weather , uns tab le s i te cond i t ions , excess ive ly h igh ambien t tempera ture , and h igh winds , un less approved by the Engineer .

Under ra iny cond i t ions , p lac ing o f concre te sha l l be s topped be fore the quant i ty o f sur face water is su f f ic ien t to cause a f low or wash o f the concre te sur face or have a de t r imenta l e f fec t on the f in ished concre te and acceptance parameters .

P lac ing o f concre te sha l l immedia te ly cease i f the hau l ing veh ic les o r any equ ipment o r pedes tr ian t ra f f i c t racks mud on the prepared base or changes the a l lowab le subgrade d imens iona l to le rances fo r Class P concre te and s labs p laced on subgrade fo r Class S or Class B concre te .

1006-5 .02 Hot Weather Concret ing:

Forms, subgrade, and re in fo rc ing s tee l sha l l be l igh t ly spr ink led wi th coo l water jus t pr io r to the p lacement o f concre te .

SECTION 1006

1178

Ch i l led mix water o r we l l c rushed ice (subs t i tu ted as a par t o f the mix water on a pound fo r pound bas is ) may be used to cont ro l the concre te tempera ture .

Aggregate may be coo led by sys temat ic spr ink l ing o f aggregate s tockp i les fo r evapora t ive coo l ing or by the use o f l iqu id n i t rogen sys tems.

I f requ i red by the Engineer , windscreens sha l l be used to reduce the evapora t ion ra te when cur ing methods a lone are no t su f f ic ien t to ma in ta in the evapora t ion ra te wi th in acceptab le l imi ts . On br idge decks , windscreens sha l l p ro jec t a t leas t 6 fee t above the prepared br idge deck sur face . Windscreens may be made o f any cons truc t ion mater ia l that p rov ides su f f ic ien t s t rength to res is t the fo rce o f the wind .

I f dur ing f in ish ing an unexpected env i ronmenta l change or de lay occurs , a monomolecu la r f i lm produc t tha t a ids in re ta rd ing the evapora t ion may be used pr io r to f in ish ing wi th the Engineer ’s approva l . The monomolecu la r f i lm sha l l be app l ied in accordance wi th the manufac turer ’s recommendat ions . The evapora t ion re tarder sha l l be app l ied in a f ine mis t us ing su i tab le sprayers ; i t sha l l no t impact the p las t ic concre te sur faces in a s t ream.

Concre te sur faces to wh ich an evapora t ive re ta rdant has been app l ied sha l l no t be sub jec ted to f in ish ing wh ich mixes the re ta rdant in to the p las t ic concre te . App l ica t ion o f an evapora t ion re tardant sha l l no t de lay the p lacement o f cur ing compound as descr ibed in Subsec t ion 1006-6 .01(C) o f the spec i f i ca t ions .

1006-5 .03 Cold Weather Concret ing:

Concre te sha l l no t be p laced on or aga ins t ice-coated fo rms, re in fo rc ing s tee l , s t ruc tu ra l s tee l , condu i ts , o r cons truc t ion jo in ts ; nor on or aga ins t snow, ice , o r f rozen ear th mater ia ls . Immedia te ly p r io r to p lac ing concre te , the tempera ture o f fo rms, re in fo rc ing s tee l , ear then mater ia l , o r any o ther mater ia l that wi l l come in contac t wi th the f resh ly p laced concre te sha l l be a min imum tempera ture o f 40 degrees F. I f a r t i f i c ia l heat is used to ad jus t the tempera ture o f the i tems tha t wi l l come in contac t wi th the f resh ly mixed concre te , the tempera ture o f these i tems sha l l no t exceed 10 degrees F grea ter than tha t of the concre te be ing p laced.

Concre te opera t ions sha l l be d iscont inued when a descend ing ambien t tempera ture in the shade and away f rom ar t i f ic ia l heat fa l ls be low 40 degrees F. Concre te opera t ions sha l l no t be resumed unt i l an ascend ing ambien t tempera ture in the shade and away f rom ar t i f i c ia l heat exceeds 35 degrees F un less o therwise approved by the Engineer .

Mix ing and p lac ing concrete sha l l con t inue no la te r than tha t t ime o f day wh ich a l lows su f f ic ien t t ime to p lace and pro tec t the concre te a l ready poured be fore the ambient tempera ture drops to 35 degrees F.

SECTION 1006

1179

Concre te sha l l be pro tec ted in a manner to ma in ta in a l l concre te sur face tempera tures a t no t less than 50 degrees F fo r a per iod o f 72 hours a f te r p lacement and a t no t less than 40 degrees F fo r an add i t iona l 96 hours .

The cont rac tor may use equ ipment to heat the aggregates or water , o r bo th , p r io r to mix ing. I f aggregates are heated , the min imum tempera ture o f the heated aggregate sha l l be 60 degrees F and the aggregates sha l l have no chunks o f ice o r f rozen aggregate present . Equ ipment used to heat the aggregates sha l l be such tha t cons is ten t tempera tures are ob ta ined th roughout the aggrega te wi th in each ba tch and f rom one ba tch to another . Water sha l l no t be heated in excess of 150 degrees F un less the water is mixed wi th the aggregate pr io r to the add i t ion o f cement to the ba tch . Dur ing the heat ing or mix ing process , cement sha l l no t be added to water and aggregate combina t ions wh ich exceed 100 degrees F.

When weather fo recas ts ind ica te a p robab i l i t y tha t ambien t tempera tures are to fa l l be low 35 degrees F dur ing the p lacement o r cur ing per iods , the cont rac tor sha l l submi t a co ld weather concre t ing p lan to the Engineer fo r approva l p r io r to concre te p lacement. The co ld weather concre t ing p lan sha l l de ta i l methods and equ ipment wh ich are to be used to ensure tha t the requ i red concre te tempera tures are main ta ined. The cont rac tor sha l l p rov ide adequate co ld weather p rotec t ion in the fo rm o f insu la t ion and/or heated enc losures to p ro tec t the concre te a f te r p lacement . For b r idge decks and suspended s t ruc tu res , the co ld weather concre t ing p lan sha l l inc lude pro tec t ion measures fo r bo th the top and bo t tom sur faces o f the concre te . Th is p rotec t ion sha l l ma in ta in concre te sur face temperatures as spec i f ied above a t a l l loca t ions in the s t ruc tu re . When ar t i f i c ia l heat ing is requ i red , the heat ing un i ts sha l l not loca l ly heat o r d ry the surface o f the concre te .

When a co ld weather concre t ing p lan is requ i red, the Engineer may requ i re concre te tempera tures to be measured and cont inuous ly recorded by the use o f tempera ture sens ing dev ices dur ing the en t i re cur ing per iod . The contrac tor sha l l p rov ide the tempera ture sens ing dev ices , inc lud ing i ts manufac turer ’s cer t i f i ca t ion wh ich sha l l be in accordance wi th ASTM C1074, and record ing ins t ruments . The cont rac tor sha l l ins ta l l tempera ture sens ing dev ices near the sur face o f the concre te a t loca t ions and depths des ignated by the Engineer . When concre te is p laced on a b r idge deck or suspended s t ruc tu re , bo th the bo t tom sur face and the top sur face sha l l be mon i tored wi th tempera ture sens ing dev ices . Tempera ture sens ing dev ices and record ing ins t ruments sha l l be approved by the Engineer . The cont rac tor sha l l con t inuous ly mon i tor the concre te tempera ture and prov ide the recorded da ta to the Engineer upon request .

I f the sur face concre te tempera ture a t any loca t ion in the s t ruc tu re fa l ls be low 35 degrees F dur ing the cur ing per iod , the Engineer may d i rec t the cont rac tor to core the areas in ques t ion a t the loca t ions ind ica ted by the Engineer . The cont rac tor sha l l submi t the cores to a pe trographer fo r examinat ion in accordance wi th ASTM C856. Concre te damaged by f ros t , as de termined by the pe t rographer , sha l l be removed and rep laced

SECTION 1006

1180

a t no add i t iona l cos t to the Depar tment . A l l cos ts assoc ia ted wi th cor ing, t ransmi t ta l o f cores , and pe t rograph ic examinat ion sha l l be a t no add i t iona l cos t to the Depar tment regard less o f the ou tcome o f the pe t rograph ic examinat ion .

The p lac ing o f concre te wi l l no t be permi t ted un t i l the Engineer is sa t is f ied tha t a l l the necessary p ro tec t ion equ ipment and mater ia ls a re on hand a t the s i te and in sa t is fac to ry work ing cond i t ion .

Concre te requ i r ing co ld weather p ro tec t ion sha l l have such pro tec t ion removed a t the end o f the requ i red cur ing per iod in such a manner tha t wi l l permi t a gradua l d rop in the concre te tempera tures .

1006-6 Cur ing Concrete:

1006-6 .01 Cur ing Cast - in-Place Concrete:

(A) Genera l Requirements:

Al l cas t - in -p lace concre te sha l l be cured by one, o r by a combina t ion o f more than one, o f the methods spec i f ied here in and cur ing sha l l begin immedia te ly a f te r complet ion o f mach ine or hand f in ish ing o f the f resh concre te .

Cur ing sha l l be cont inued fo r a per iod o f a t leas t seven days a f ter p lac ing i f e i ther Type I I Por t land cement o r Por t land pozzo lan cement has been used, o r fo r a t leas t th ree days i f Type I I I Por t land cement has been used.

Sur faces requ i r ing a Class I I f in ish sha l l no t be cured by the L iqu id -Membrane Forming Compound Method un t i l a f te r the f in ish ing opera t ions are comple ted .

No t ra f f i c , hau l ing, s to r ing o f mater ia l or o ther work sha l l be a l lowed on any concre te sur face dur ing the requ i red cur ing per iods .

(B) Water Cur ing Method:

Al l sur faces no t covered by reasonab ly waterproo f fo rms sha l l be kept damp by app ly ing water wi th a nozz le tha t so a tomizes the f low o f the water tha t a fog mis t and no t a spray is fo rmed unt i l the sur face o f the concre te is covered wi th a cur ing med ium or spr ink l ing o f the sur face is permi t ted . The mois tu re f rom the nozz le sha l l no t be app l ied under p ressure d i rec t ly upon the concre te and sha l l no t be a l lowed to accumula te on the concre te in a quant i ty su f f ic ien t to cause a f low or wash the sur face .

I f a cur ing med ium is used, the concre te sha l l be kept cont inuous ly wet by spr ink l ing wi th water fo r the en t i re cur ing per iod . Bur lap , rugs , carpe ts , o r ear th o r sand b lankets may be used as a cur ing med ium to

SECTION 1006

1181

re ta in the mois tu re dur ing the cur ing per iod . Appl ica t ion o f the cur ing med ium sha l l no t begin un t i l such t ime tha t p lacement can be made wi thout marr ing the sur faces o f the concre te . App l ica t ion o f a non-a tomized spray o f water , water by b rushes , o r any o ther non-approved method wi l l no t be permi t ted .

Fogging equ ipment sha l l cons is t o f a mechan ica l ly opera ted pressur ized sys tem us ing inc rementa l ly spaced t r ip le headed nozz les or equ iva len ts . The nozz les sha l l be po int ing hor izon ta l ly , para l le l to the sur face o f the concre te and a t a d is tance no t to exceed 36 inches above the concre te sur face .

The fogging equ ipment sha l l be mounted such tha t i t i s s ta t ionary . Each nozz le sha l l be equ ipped wi th an eas i ly access ib le cont ro l capab le o f vary ing the vo lume o f water f low and immedia te ly shut t ing o f f the water when in the o f f pos i t ion. Hand-he ld fogging equ ipment wi l l no t be a l lowed.

I f a cur ing med ium is no t used, the en t i re sur face o f the concre te sha l l be kept damp by the appl ica t ion o f water wi th an a tomiz ing nozz le as spec i f ied above un t i l the concre te has se t , a f te r which the en t i re sur face o f the concre te sha l l be spr ink led cont inuous ly wi th water fo r the en t i re cur ing per iod .

In no case sha l l cur ing be in te r rup ted by more than one hour dur ing the cur ing per iod .

(C) Liquid-Membrane Forming Compound Method:

L iqu id membrane fo rming compound sha l l con form to the requ i rements o f ASTM C309 and a lso meet the c r i te r ia in Tab le 1006-8 . Approva l o f cur ing compound wi l l be based on a Cer t i f i ca te o f Ana lys is conforming to the requ i rements o f Subsec t ion 106.05 o f the spec i f i ca t ions submi t ted fo r each lo t . Cur ing compound sha l l no t be used on a p ro jec t p r io r to approva l .

Any cur ing compounds not p rev ious ly approved fo r use on a cur ren t o r pas t ADOT pro jec t sha l l be tes ted fo r p re-approva l by the St ruc tura l Mater ia ls Tes t ing Sec t ion pr io r to the submi t ta l o f the Cer t i f i ca te o f Ana lys is . The pre-approva l tes t ing sha l l be de termined by the Engineer and in accordance wi th the requ i rements in Tab le 1006-8 .

The approva l o f Type 2 (wh i te p igmented) cur ing compounds sha l l be e f fec t ive fo r a max imum of s ix months f rom the produc t ion da te . The approva l o f Type 1-D (c lear o r t rans lucent wi th fugi t i ve dye) cur ing compounds sha l l be e f fec t ive fo r a max imum of 12 months f rom the produc t ion da te .

SECTION 1006

1182

TABLE 1006-8 Test ing Cr i ter ia for Liquid Membrane Forming Compound

Procedure Cr i ter ia Color Clear (Type 1-D) Whi te (Type 2) De le te r ious React ion w/ Concre te No React ion No React ion

Dry ing Time Tes t Less than 4 hours Less than 4 hours

Mois tu re Loss (72 hours) Less than 0 .55 kg/m²

Less than 0 .55 kg/m²

Ref lec tance Tes t N/A 60% or grea ter Three-Day Set t lement Tes t (MNDOT Procedure)

Less than 2 ml a f te r 3 days

Less than 2 ml a f te r 3 days

Non-vo la t i le Conten t Tes t (D2369 Method A) Min imum 25% Min imum 25%

The Engineer sha l l reserve the r igh t to sample cur ing compound a t the source to per fo rm tes ts spec i f ied in ASTM C309 fo r ver i f i ca t ion purposes . Sampl ing f requency wi l l be a t the d isc re t ion o f the Engineer . Cur ing compound wi th fa i l ing ver i f i ca t ion tes t resu l ts sha l l no t be used.

Al l sur faces no t covered by waterproo f fo rms sha l l be cured by the l iqu id -membrane fo rming compound method. The cur ing compound sha l l be app l ied to the concre te immedia te ly fo l lowing the sur face f in ish ing opera t ion in one or more app l ica t ions to ta l ing a ra te o f a t leas t 1 ga l lon per 100 square fee t . The cont rac tor sha l l no t exceed the coverage ra te spec i f ied in ASTM C309.

The cur ing compound shal l fo rm a cont inuous unbroken sur face .

Type 2 compound wi th e i ther a Class A or Class B veh ic le sha l l be used fo r concre te pavement , br idge decks , and approach s labs . Type 1-D compound wi th e i ther a Class A or Class B veh ic le sha l l be used for o ther concre te i tems.

I f the membrane f i lm is b roken dur ing the cur ing per iod , the broken area sha l l be g iven a new app l ica t ion o f compound a t a ra te su f f ic ien t to ensure un i fo rm coverage.

In no case sha l l cur ing be in te r rup ted by more than one hour dur ing the cur ing per iod .

(D) Forms in Place Method:

Formed sur faces o f concre te may be cured by reta in ing the fo rms in p lace . The fo rms sha l l remain in p lace fo r the en t i re cur ing per iod .

Al l jo in ts in the fo rms and the jo in ts be tween the end o f fo rms and concre te sha l l be kept mo is tu re- t igh t dur ing the cur ing per iod .

Cracks in the fo rms and c racks be tween the fo rms and the concre te sha l l be resea led by methods approved by the Engineer .

SECTION 1006

1183

(E) Cur ing Br idge Decks, Approach Slabs, and Anchor Slabs:

The top sur face o f b r idge decks , approach s labs , and anchor s labs sha l l be cured by the l iqu id -membrane fo rming compound method and by the water cur ing method. The cur ing compound sha l l be app l ied progress ive ly immedia te ly fo l lowing the sur face f in ish ing opera t ion .

Water cur ing sha l l be app l ied no t la te r than four hours a f te r the comple t ion o f the sur face f in ish ing opera t ions and sha l l be app l ied as spec i f ied here in .

The top sur face o f b r idge decks , approach s labs , and anchor s labs that wi l l be covered wi th a spec ia l r id ing sur face or waterproo f ing membrane sha l l be cured by the water cur ing method on ly . Water cur ing sha l l be app l ied progress ive ly immedia te ly fo l lowing the sur face f in ish ing opera t ion as spec i f ied here in .

1006-6 .02 Cur ing Precast Concrete:

(A) Genera l Requirements:

The cont rac tor may cure precas t concre te in accordance wi th the requ i rements spec i f ied above fo r cur ing cas t - in -p lace concre te o r the cur ing o f p recas t concre te may be per fo rmed by ex terna l heat ing. Th is may be accompl ished by the use o f low-pressure steam or rad ian t heat wi th mo is tu re .

I f cur ing o f the concre te is accompl ished by low-pressure s team or rad ian t heat wi th mo is tu re , cur ing wi l l be cons idered comple ted a f te r te rmina t ion o f s team or rad ian t heat cur ing. Rap id tempera ture changes in the concre te sha l l be avo ided dur ing the coo l ing per iod .

I f cur ing o f the concre te is accompl ished by the water cur ing method, the l iqu id -membrane fo rming compound method, o r the fo rms- in -p lace method, such cur ing sha l l be cont inued fo r a per iod o f a t leas t seven days a f ter p lacement o f the concre te . The cur ing t ime may be reduced to a min imum of th ree days when a Type I I I Por t land cement has been used.

For p recas t i tems, when a concre te mix conta ins s i l i ca fume, a cur ing p lan acceptab le to the Engineer sha l l be submi t ted fo r approva l .

Concre te tes t cy l inders sha l l be in i t ia l l y cured wi th , and in the same manner as the precas t concre te p roduc ts . F ina l cur ing wi l l be per AASHTO T 23 /ASTM C31.

SECTION 1006

1184

(B) Low-Pressure Steam Cur ing:

Af te r p lacement o f the concre te , p recas t i tems sha l l be he ld fo r a min imum two-hour p res teaming per iod . I f the ambien t a i r tempera ture is be low 50 degrees F, s team sha l l be app l ied dur ing the pres teaming per iod to ho ld the a i r sur round ing the precas t i tem a t a tempera ture be tween 50 and 90 degrees F. When the ambien t tempera ture fa l ls be low 50 degrees F, s team or rad ian t heat may be used to keep the enc losure a t a tempera ture o f no t more than 90 degrees F un t i l the acce le ra ted cur ing per iod begins .

Acce le ra ted cur ing sha l l no t commence un t i l one hour a f te r in i t ia l se t or th ree hours a f te r p lacement o f concre te , wh ichever is longer . In i t ia l se t wi l l be de termined in accordance wi th ASTM C403 and the resu l ts submi t ted wi th each mix des ign .

To prevent mo is tu re loss on exposed sur faces dur ing the pres teaming per iod , p recas t i tems sha l l be covered as soon as poss ib le a f ter cas t ing or the exposed sur faces sha l l be kept wet by fog spray or wet b lankets .

Enc losures fo r s team cur ing sha l l a l low f ree c i rcu la t ion o f s team about the member and sha l l be cons t ruc ted to conta in the l i ve s team wi th a min imum mois tu re loss . The use o f ta rpau l ins o r s imi la r f lex ib le covers wi l l be permi t ted , p rov ided they are kept in good repa i r and secured in such a manner to p revent the loss o f s team and mois tu re .

Steam a t the je ts sha l l be low pressure and in a sa tura ted cond i t ion. Steam je ts sha l l no t imp inge d i rec t ly on the concre te , tes t cy l inders o r fo rms. Dur ing app l ica t ion o f the s team, the ambien t a i r tempera ture r ise wi th in the enc losure sha l l no t exceed 40 degrees F per hour . The average cur ing tempera ture th roughout the enc losure sha l l no t exceed 160 degrees F and sha l l be main ta ined a t a cons tan t leve l fo r a su f f ic ien t length o f t ime so as to ensure the deve lopment o f the requ i red compress ive s t rength by the age o f 28 days in concre te i tems wh ich are no t be pres t ressed. The concre te tempera ture dur ing acce le ra ted cur ing sha l l no t exceed 170 degrees F. The manufac turer sha l l have a tempera ture measur ing dev ice(s ) tha t a l lows the Depar tment to mon i tor the concre te cur ing tempera ture a t a l l t imes. For i tems wh ich are to be pres t ressed, the cons tan t tempera ture sha l l be main ta ined fo r su f f ic ien t t ime necessary to deve lop the concre te compress ive s t rength requ i red fo r p res t ress ing. The ambien t cur ing tempera ture sha l l no t exceed 175 degrees F a t any po in t . Cont ro l cy l inders sha l l be covered to p revent mo is tu re loss and sha l l be p laced in a loca t ion where tempera ture is representa t ive o f the average tempera ture o f the enc losure .

Tempera ture record ing dev ices tha t wi l l p rov ide an accura te cont inuous permanent record o f the ambien t cur ing tempera ture sha l l be prov ided. A min imum of two tempera ture record ing dev ices or one fo r every 200 fee t o f con t inuous bed length a re requ i red fo r check ing tempera ture . The loca t ion o f each tempera ture measur ing dev ice wi l l be chosen by the Engineer . The enc losure around each precas t concre te i tem sha l l be

SECTION 1006

1185

adequate to ensure a cons is ten t concre te cur ing tempera ture . Once the cur ing enc losure procedure is es tab l ished, the concre te cur ing tempera ture sha l l be mon i to red a t one loca t ion fo r each precas t i tem. A tempera ture measur ing dev ice sha l l be p laced in each precas t b r idge member . The d i f ference in the concre te cur ing tempera ture a t the ends o f each precas t b r idge member sha l l no t exceed 20 degrees F. Forms sha l l no t be cons idered a component o f the enc losure dur ing acce le ra ted cur ing. A tempera ture measur ing dev ice sha l l be p laced in a t leas t two precas t concre te p roducts . The d i f fe rence in the concre te cur ing tempera ture a t any loca t ion wi th in the enc losure fo r a p recas t concre te p roduc t sha l l no t exceed 20 degrees F. When box g i rders o r vo ided s lab lengths are less than 60 fee t , the concre te cur ing tempera ture sha l l be measured on every o ther b r idge member . The manufac turer sha l l supp ly a repor t o f the concre te cur ing tempera tures fo r each concre te cas t ing.

In the event the s ide fo rms are removed be fore the precas t un i t has a t ta ined the requ i red re lease compress ive s t rength, the cur ing method sha l l be cont inuous in ma in ta in ing the tempera ture and mois tu re leve l as descr ibed above, wi th in the enc losure , as near ly as p rac t ica l . There sha l l no t be a de lay in re -cover ing the g i rder o r p res t ress member .

(C) Radiant Heat With Moisture:

Radian t heat sha l l be app l ied by means o f p ipes c i rcu la t ing s team, ho t o i l o r ho t water , or by heat ing e lements o r e lec t r ic b lankets on the forms. P ipes , b lankets o r e lements sha l l no t be in contac t wi th the concre te sur faces .

Mo is tu re sha l l be app l ied in such a manner as to keep the top sur face o f the precas t un i t con t inuous ly mo is t dur ing the cur ing per iod by fogging or spray ing. Mo is tu re shal l be main ta ined by a cover o f bur lap or co t ton mat t ing and fu r ther covered by a waterproo f ta rpaul in wi th an insu la t ing cover .

Tempera ture l imi ts and the use o f record ing thermometers sha l l be the same as cur ing wi th low-pressure s team. App l ica t ion o f the heat cyc le may be acce le ra ted to meet c l imat ic cond i t ions upon the approva l o f the Engineer . A tempera ture sens ing dev ice sha l l be p laced 2 ± 1 /2 inches f rom the heated fo rm.

1006-7 Acceptance Sampl ing and Test ing:

1006-7 .01 Genera l :

Sampl ing and tes t ing o f concre te wi l l occur to de termine the acceptab i l i t y o f the concre te in accordance wi th the tes t methods and c r i te r ia ident i f ied be low. Concre te sa t is fy ing the cr i te r ia shown in the fo l lowing sec t ions is acceptab le fo r use in the work . Re jec t ion of concre te de l ivered to the s i te may occur due to fa i lu re to sa t is fy or ach ieve the spec i f ied c r i te r ia inc lud ing, bu t no t l imi ted to : improper tempera ture , s lump, a i r con ten t , o r ba tch quant i t ies tha t excess ive ly

SECTION 1006

1186

dev ia te f rom the mix des ign . The Engineer may a l low def ic ien t concre te mix tu res a l ready p laced to remain in p lace sub jec t to f ina l acceptance by the 28 day compress ive s t rength tes t ing prov ided there is con f i rmat ion tha t the p lacement had adequate conso l ida t ion th roughout the pour . Def ic ien t concre te mix tu res due to insu f f ic ien t a i r con ten t , o r improper s lump wh ich exh ib i t the appearance o f segregat ion or lack o f adequate conso l ida t ion , wi l l no t be accepted and sha l l be removed a t no add i t iona l cos t to the Depar tment .

For the mix tu re de l ivered to the s i te , the we igh ts and vo lumes sha l l be wi th in the to le rances descr ibed in Subsec t ion 1006-4 .02 o f the spec i f i ca t ions fo r each component .

Acceptance and pena l t ies fo r p laced concre te wh ich meets the spec i f ied mix tu re requ i rements o r is a l lowed to remain in p lace sha l l be de termined by the resul ts o f the 28-day compress ive s trength as spec i f ied in Subsec t ion 1006-7 .03 o f the spec i f i ca t ions , and add i t iona l ly in the case o f Class P concre te , on the measured th ickness o f concre te pavement in p lace as spec i f ied in Sec t ion 401 o f the spec i f i ca t ions. Sampl ing and tes t ing fo r compress ive s t rength wi l l be per fo rmed on a l l c lasses o f concre te furn ished, inc lud ing each s t rength spec i f ied on the pro jec t p lans fo r Class S concre te .

1006-7 .02 Fie ld Sampl ing and Test ing:

(A) Genera l :

A sample o f concre te for de termina t ion o f tempera ture , s lump, un i t we igh t (when requ i red) , and a i r con ten t (when requ i red) as we l l as fo r fabr ica t ion o f tes t cy l inders fo r compress ive s t rength de terminat ion a t 28 days wi l l be taken a t random a t the spec i f ied sampl ing f requency fo r each type o f concre te .

When “Se l f Conso l ida t ing Concre te” (SCC) is used, the concre te tes t cy l inders sha l l be fabr ica ted , and un i t we igh t and a i r con ten t tes ts sha l l be per fo rmed as descr ibed in Subsec t ion 1006-4 .05(E) o f the spec i f i ca t ions .

Al l sampl ing and tes t ing sha l l be done by a cer t i f ied techn ic ian meet ing the requ i rements o f the ACI Concre te F ie ld Tes t ing Techn ic ian , Grade I o r equ iva len t .

Requ i red tes t ing o f concre te wi l l be per fo rmed in accordance wi th the methods shown in Tab le 1006-9 .

SECTION 1006

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TABLE 1006-9 Sampl ing and Test ing Test Procedures

Tempera ture ASTM C1064 Slump ASTM C143 Ai r Conten t ASTM C231 or C173 Sampl ing ASTM C172 Mak ing and Cur ing Cy l inders ASTM C31 Compress ive St rength ASTM C39 Un i t Weigh t and Yie ld ASTM C138

Concre te sha l l be sampled in accordance wi th ASTM C172 fo r acceptance tes t ing o f tempera ture , s lump, un i t we igh t and y ie ld (when requ i red) and a i r con ten t (when requ i red) as we l l as fo r fabr ica t ion of tes t cy l inders fo r compress ive s t rength de terminat ion a t 28 days except tha t the concre te sha l l be sampled once dur ing d ischarge a t the midd le por t ion o f the ba tch . Suf f ic ien t care sha l l be taken to ob ta in a representa t ive sample by d iver t ing the en t i re s t ream o f the concre te to p revent segregat ion . Samples sha l l be o f su f f ic ien t s ize to per fo rm a l l the requ i red tes ts and fabr ica te the necessary test cy l inders bu t in no case less than 1 cub ic foo t .

I f the proper t ies o f the concre te do no t appear to be wi th in the spec i f i ca t ion mix des ign l imi ts fo r s lump, o r a i r con ten t , a p re l iminary sample may be ob ta ined a f te r d ischarge o f 1 /4 cub ic yards fo r in i t ia l check tes t ing. I f the pre l iminary measurement fa l ls ou ts ide the spec i f ied l imi ts , concre te p lacement sha l l be d iscont inued and addressed as fo l lows:

(1 ) When the measured s lump or a i r con ten t , o r bo th is grea ter than the spec i f ied mix des ign upper l imi t , another check tes t sha l l be made immedia te ly on a new tes t sample . In the event the second check tes t fa i ls , the concre te sha l l be cons idered to have fa i led the requ i rements o f 1006-7 .03(A) and sha l l be re jec ted ;

(2 ) When the measured s lump is be low the mix des ign spec i f ied lower l imi t , addi t iona l water may be added in accordance wi th the requ i rements o f 1006-7 .03(A) . In p lace o f the add i t ion o f water to ad jus t the s lump, an approved water reduc ing admix tu re may be added to inc rease workab i l i t y . Af te r any add i t ions , the drum sha l l be tu rned a t leas t 30 revo lu t ions a t mix ing speed and a check tes t sha l l be made on a new sample o f the adjus ted concre te to ver i fy compl iance wi th 1006-7 .03(A) ; and

(3 ) When the measured a i r con ten t fa l ls be low the mix des ign spec i f ied l imi t , an approved a i r en t ra inment admix tu re may be added to inc rease the a i r con ten t by an au thor ized representa t ive o f the ready mix supp l ier tha t has been approved by the Engineer . Af te r any add i t ions , the drum sha l l be tu rned at leas t 30 revo lu t ions a t mix ing speed and a check tes t sha l l be made on a new sample

SECTION 1006

1188

o f the ad jus ted concre te to ver i fy compl iance wi th the mix 1006-7 .03(A) .

Pre l iminary samples fo r check tes t ing do no t take the p lace o f acceptance samples . Once any add i t ions , ad jus tments , and assoc ia ted mix ing are comple te , another sample f rom the midd le por t ion o f the ba tch sha l l be taken fo r acceptance tes t ing.

Al l compress ive s t rength tes t spec imens sha l l be made, cured , hand led , p ro tec ted , and t ranspor ted in accordance wi th the requ i rements o f ASTM C31. A sa fe s to rage loca t ion(s ) / fac i l i t ies sha l l be secured for the use o f the tes t ing labora tory ( ies ) / techn ic ian(s ) to ensure proper cur ing o f concre te tes t cy l inders on the pro jec t s i te , inc lud ing su f f ic ien t access on weekends and ho l idays to a l low the t ime ly p ick -up o f cy l inders spec imens. Upon ar r iva l a t the tes t ing labora tory , a l l compress ive tes t spec imens sha l l be hand led , cured , and tes ted in accordance wi th the requ i rements o f ASTM C39. Any and a l l dev ia t ions f rom the s tandard procedure o f any tes t method sha l l be prompt ly ident i f ied and correc ted . Any dev ia t ions sha l l be c lear ly no ted by the tes t ing techn ic ian on repor ts . Shou ld an ind iv idua l cy l inder show evidence o f improper sampl ing, mo ld ing, cur ing , o r tes t ing, the resu l ts sha l l be d iscarded and the compress ive s t rength sha l l be the resu l t o f the average o f the remain ing cy l inder (s) .Tes t ing resu l ts ob ta ined f rom non-s tandard tes t ing procedures sha l l be cons idered inva l id and d iscarded by the Engineer .

I f approved by the Engineer , and un less o therwise spec i f ied , Ar izona Tes t Method 318 may be used to es t imate concre te s t rength by the matur i ty method. The matur i ty method sha l l no t subs t i tu te fo r compress ive s t rength acceptance tes t ing (28-day cy l inders ) . The cont rac tor sha l l submi t a wr i t ten reques t to the Engineer p r io r to us ing the matur i ty method. I f i t s use is approved by the Engineer , the cont rac tor sha l l deve lop a s t rength-matur i ty re la t ionsh ip and sha l l a lso prov ide the matur i ty meter (s ) and d ig i ta l da ta loggers necessary , as we l l as per fo rming a l l requ i red tes t ing, a l l a t no add i t iona l cos t to the Depar tment .

(B) Class S and Class B Concrete:

Concre te pumped to fac i l i ta te p lacement shal l be sampled fo r acceptance a t the f ina l po in t o f p lacement . Samples sha l l be taken dur ing cont inuous d ischarge o f concre te wi thout in te r rup t ion a t the normal p roduc t ion ra te . In accordance wi th Subsec t ion 601-3 .03 (C) o f the spec i f i ca t ions , where f reeze- thaw durab i l i t y is o f concern (such as in b r idge decks , over lays , approach s labs , and bar r ie r wa l ls ) , the concre te sha l l a lso be sampled a t the t ruck to de termine a i r loss through the pump. I f the loss o f a i r as measured be tween the supp ly t ruck and the po in t o f p lacement exceeds 2 percent , the cont rac tor sha l l employ measures acceptab le to the Engineer to reduce the loss o f a i r to less than 2 percent . I f sampl ing a t the po in t o f p lacement is no t p rac t ica l , as de termined by the Engineer , o r c rea tes a sa fe ty concern , the concre te sha l l be sampled fo r acceptance a t the t ruck . When acceptance sampl ing can on ly be per fo rmed a t the t ruck , the acceptab le range o f a i r

SECTION 1006

1189

conten t o f the supp l ied mix wi l l be ad jus ted to no t less than 5 percent bu t no more than 8 percent in accordance wi th Tab le 1006-10.

For Class S concre te wi th a compress ive s t rength requ i rement less than 4000 pounds per square inch , o r Class B concre te , a s t rength tes t wi l l cons is t o f the average s trength o f two tes t cy l inders . However , i f the compress ive s t rengths of the two tes t cy l inders d i f fe r by more than 10 percent f rom the average o f the two, the s t rength tes t resu l t sha l l be the cy l inder wi th the h ighes t compress ive s t rength .

For Class S concre te wi th a compress ive s t rength requ i rement equa l to o r grea ter than 4000 pounds per square inch , o r Class P concre te , the compress ive s t rength o f each sample sha l l be de termined by averaging the resu l ts o f the th ree tes t cy l inders . However , i f the compress ive s t rength o f any one o f the th ree tes t cy l inders d i f fe rs by more than 10 percent f rom the average o f the th ree , i ts resul t sha l l be d iscarded and the compress ive s t rength sha l l be the average o f the remain ing two cy l inders . Shou ld the indiv idua l compress ive s t rength o f any two o f the th ree remain ing cy l inders d i f fe r by more than 10 percent f rom the average o f the three , the resu l ts wi l l be d iscarded and the compress ive s t rength sha l l be the s t rength o f the remain ing cy l inder .

(C) Class P Concrete:

Samples o f concre te sha l l be taken in accordance wi th the requ i rements o f ASTM C172, except concre te fo r Class P sha l l be sampled immedia te ly be fore go ing in to the paver o r fo rms, o r as o therwise d i rec ted by the Engineer .

(D) Precast Concrete

(1 ) Major Precast Concrete Structures

The concre te wi l l be f ie ld sampled and compress ive s t rength tes ted by the Engineer in accordance wi th the requ i rements in 1006-7 .02 fo r Class S wi th the add i t ion o f the fo l lowing:

Fabr ica t ion o f tes t cy l inders fo r compress ive s t rength de terminat ion sha l l be done for one day ( fo r re lease breaks) , seven days , and 28 days . The acceptance samples sha l l represent one member , one day ’s p roduc t ion , o r as de termined by the Engineer .

(2 ) Minor Precast Concrete Structures

A s t rength tes t on each precas t un i t p roduced wi l l cons is t o f the average rebound number as de termined f rom read ings taken on the precas t un i t wi th a rebound hammer . The average rebound number wi l l be de termined in accordance wi th the requ i rements o f ASTM C805.

The compress ive s t rength o f the concre te wi l l be de termined f rom the average rebound number and the ca l ib ra t ion chart es tab l ished fo r the

SECTION 1006

1190

spec i f i c rebound hammer be ing used. The ca l ib ra t ion char t wi l l be es tab l ished f rom rebound read ings taken on concre te tes t cy l inders fabr ica ted a t the precas t p lan t and the ac tua l compress ive s t rength o f the cy l inders .

1006-7 .03 Acceptance Cr i ter ia :

Concre te acceptance tes t resu l ts and ver i f i ca t ions sha l l be eva lua ted for acceptance us ing the c r i te r ia es tab l ished in th is sec t ion .

(A) Plast ic Concrete

Plas t ic concre te is concre te wh ich has been de l ivered to the pro jec t , i s s t i l l in a workab le s ta te , and has no t ye t ach ieved in i t ia l se t . The c r i te r ia used fo r accept ing p las t ic concre te a re as fo l lows:

(1 ) Elapsed T ime

The batch t ime is de f ined as the t ime a t wh ich cement i t ious mater ia l i s combined wi th water o r aggregate . Discharge f rom the t ruck mixer o r t ruck agi ta to r sha l l be comple ted wi th in 90 minu tes f rom batch ing. The Engineer may a l low concre te p lacement to cont inue in excess o f the 90 minu tes i f the concre te is o f such s lump, workab i l i t y , and/or tempera ture tha t i t can be p laced wi thout the add i t ion o f water to the ba tch . Add i t iona l d ischarge t ime sha l l a lso be a l lowed prov ided a hydra t ion s tab i l i z ing admix tu re is shown on the approved mix des ign and has been inc luded in the ba tch , sub jec t to the fo l lowing:

(a ) The concre te remains o f su f f ic ien t s lump and workab i l i t y to fac i l i ta te adequate conso l ida t ion dur ing p lacement , and;

(b ) The hydra t ion s tab i l i z ing admix tu re conforms to the requ i rements o f subsec t ion 1006-2 .04 o f the spec i f i ca t ions and re tards hydra t ion by a hydra t ion s tab i l i z ing mechan ism, and;

(c ) The dosage ra te is ident i f ied in the approved mix des ign , and the add i t iona l amount o f ba tch to d ischarge t ime exceed ing the 90 minu te l imi t has been requested by the cont rac tor fo r approva l by the Engineer and acknowledged on the mix des ign by the Engineer , o r ;

(d ) I f dur ing p lacement , the dosage range is iden t i f ied in the approved mix des ign and the app l ica t ion-spec i f i c dosage and add i t iona l t ime has been requested by the cont rac tor and approved by the Engineer .

SECTION 1006

1191

(2 ) Temperature:

The tempera ture o f the concre te mix tu re immedia te ly be fore p lacement sha l l no t be less than 50 degrees F nor grea ter than 90 degrees F. The Engineer may a l low concre te p lacement to cont inue in excess o f the max imum tempera ture i f the concre te is o f such s lump or workab i l i t y tha t i t can be p laced wi thout the add i t ion o f water to the ba tch . The Engineer may a lso approve concrete mix tu res wi th a tempera ture less than 50 degrees F or grea ter than 90 degrees F i f o therwise spec i f ied or p re-approved by a mix des ign tha t accounts fo r the tempera ture dev ia t ion . Otherwise , concre te tha t fa i ls to conform to th is tempera ture requ i rement wi l l be re jec ted pr io r to p lacement .

(3 ) Consistency:

The cont rac tor sha l l fu rn ish Class P Concre te hav ing a s lump wi th in the range spec i f ied in Tab le 1006-5 .

The cont rac tor sha l l fu rn ish Class S and Class B concre te hav ing the s lump shown on the approved mix des ign , wi th a permiss ib le var ia t ion o f ± 1 inch when the s lump shown on the approved mix des ign is 4 inches or less , and a permiss ib le var ia t ion o f ±1½ inches when the s lump shown on the approved mix des ign is grea ter than 4 inches . However , when an approved h igh range water reduc ing chemica l admix tu re (ASTM C494, Type F or Type G) conforming to the requ i rements o f Subsec t ion 1006-2 .04 is used, the permiss ib le var ia t ion wi l l be ± 2 inches , un less o therwise requ i red by the Spec ia l Prov is ions . Concre te tha t fa i ls to conform to the cons is tency requ i rements wi l l be re jec ted .

When concre te is pumped, samples fo r cons is tency wi l l be taken bo th as the concre te leaves the mixer and a t the pump hose d ischarge. I f the Engineer de termines tha t there is a favorab le cor re la t ion be tween the resu l ts o f cons is tency tes ts on samples ob ta ined f rom the mixer and f rom the pump hose, the Engineer may d iscont inue sampl ing f rom one o f the sources . I f a favorab le corre la t ion is no t ma in ta ined, the cont rac tor sha l l employ cor rec t ive measures acceptab le to the Engineer and sampl ing wi l l con t inue f rom both sources to ver i fy the cor re lat ion o f tes t resu l ts .

I f the workab i l i t y o f the concre te needs to be ad jus ted (o r i f add i t iona l mix ing water is requ i red to ma in ta in the mix des ign water -cement i t ious mater ia l ra t io ) , add i t iona l mix ing water may be added as long as i t does no t exceed the amount of permiss ib le water to meet the approved mix des ign max imum water to le rance, as no ted on the de l ivery t i cke t . The concre te sha l l be mixed by a min imum of 30 revo lu t ions o f the drum a t mix ing speed a f te r the water has been added, p r io r to d ischarge o f any concre te fo r p lacement . The cont rac tor sha l l ensure tha t any add i t iona l mix ing water and requ i red mix ing revo lu t ions sha l l be recorded on the de l ivery t i cke t as spec i f ied in Subsec t ion 1006-4 .03(D) o f the spec i f i ca t ions . Th is add i t iona l mix ing may be in excess o f the max imum revo lu t ions a t mix ing speed prev ious ly spec i f ied .

SECTION 1006

1192

(4 ) Air Content :

Where a i r -en t ra inment is u t i l i zed as ident i f ied in Sec t ion 1006-3 .01(E) o f the spec i f i ca t ions , the a i r con ten t o f the concre te mix tu re a t the po in t o f p lacement sha l l meet the requ i rements in the fo l lowing tab le :

TABLE 1006-10 Air Entra inment Requirements

Elevat ion Freeze-Thaw & Air Loss

Concern

Air Entra inment

Required

Required Air Content by Volume

(%) 3,000 fee t o r above No Yes 4 to 7 3 ,000 fee t o r above Yes Yes 5 to 8*

Be low 3 ,000 fee t N/A Cont rac tor ’s Opt ion ≤ 7

Note : * In accordance wi th Subsec t ion 1006-7 .02 (A) o f the spec i f i ca t ions , when the concre te is pumped and acceptab le sampl ing can on ly be per fo rmed a t the t ruck .

Concre te tha t fa l ls be low the min imum may be ad jus ted wi th the add i t ion o f an approved a i r en t ra inment admix tu re in accordance wi th 1006-7 .02(A) . Concre te tha t fa i ls to conform to the max imum a i r con tent requ i rements l i s ted above fo r the respec t ive e leva t ion as de termined by the Engineer , sha l l be re jec ted pr io r to p lacement .

(B) Hardened Concrete:

(1 ) Class P Concrete:

Class P concre te wi l l be accepted fo r compress ive s t rength in accordance wi th the prov is ions o f Sec t ion 401 o f the spec i f i ca t ions . A l l concre te fa i l ing to meet the compress ive s t rength requ i rement o r o therwise re jec ted in accordance wi th Sec t ion 401 or Subsec t ion 1006-7 .01 o f the spec i f ica t ions, sha l l be rep laced wi th concre te meet ing the requ i rements o f these spec i f i ca t ions .

I f the cont rac tor chooses to contes t the compress ive s t rength resu l ts o f any sample fo r purposes o f acceptab i l i t y or improv ing a negat ive pay fac to r , the cont rac tor may e lec t to re ly on the resu l ts o f compress ive s t rengths o f cores . Three cores sha l l be ob ta ined a t no add i t iona l cos t to the Depar tment , a t the approx imate loca t ion where the contes ted tes t cy l inders were ob ta ined. Such cores sha l l be ob ta ined and tes ted in accordance wi th the requ irements o f ASTM C42. Co res must be ob ta ined under the observa t ion o f an ADOT representa t ive and de l ivered to the Engineer in t ime to a l low comple te tes t ing wi th in 48 days o f p lacement . Tes t ing sha l l be per fo rmed by the Depar tment . The cont rac tor may e lect to have a representa t ive present dur ing tes t ing. Compress ive s t rength sha l l be the average o f the resu l ts o f the th ree cores . However , i f the compress ive s t rength o f any one o f the th ree cores d i f fe rs by more than

SECTION 1006

1193

10 percent f rom the average o f the th ree , i ts resul t sha l l be d iscarded and the compress ive s t rength sha l l be the average o f the remain ing two cores . Shou ld the ind iv idua l compress ive s t rength o f any two o f the th ree cores d i f fe r by more than 10 percent f rom the average o f the th ree, the resu l ts o f bo th sha l l be d iscarded and the compress ive s t rength sha l l be the resu l t o f the remain ing core . Resu l ts o f the core tes t ing wi l l be b ind ing on bo th the cont rac tor and the Depar tment, and wi l l rep lace the resu l ts o f the tes t cy l inders fo r tha t sample .

(2 ) Class S and Class B Concrete:

Class S and Class B concre te wi l l be accepted for compress ive s trength and pa id fo r in accordance wi th the fo l lowing tab le . Concre te wi l l be pa id fo r by the l inear foo t o r by the cub ic yard , comple te in p lace , except tha t an ad jus tment in the cont rac t un i t p r ice , to the neares t cen t , wi l l be made fo r the quant i ty o f concre te represented by 28-day compress ive s t rength tes t resu l ts less than the spec i f ied requ i rement .

Concre te fa i l ing to meet a t leas t 85 percent o f the 28-day compress ive s t rength fo r spec i f ied s t rengths o f 3 ,000 pounds per square inch and be low, 90 percent fo r a spec i f ied s t rength o f 3 ,500 pounds per square inch , o r 95 percent fo r spec i f ied s t rengths o f 4 ,000 pounds per square inch and above, o r any concre te fa i l ing to meet the o ther requ i rements o f Subsec t ion 1006-7 .01 o f the spec i f i ca t ions , wi l l be re jec ted and removed a t no add i t ional cos t to the Depar tment and rep laced wi th concre te wh ich meets the spec i f ied requ i rements , un less the cont rac tor can submi t ev idence tha t wi l l ind ica te to the Engineer tha t the s t rength

Adjustment in Contract Uni t Pr ice for Compressi ve Strength of Class S and Class B Concre te

3000 psi and Below 3500 psi 4000 psi and Above Percent o f

Spec i f ied 28-Day

Compress ive S t rengt h

A t ta ined, to the Neares t 1

Percent

Percent Reduc t ion

in Cont rac t

Un i t P r ice (See Note

1)

Percent o f Spec i f ied 28-

Day Compress ive

S t rengt h A t ta ined, to

the Neares t 1 Percent

Percent Reduc t ion

in Cont rac t

Un i t P r ice (See Note

1)

Percent o f Spec i f ied 28-

Day Compress ive

S t rengt h A t ta ined, to

the Neares t 1 Percent

Percent Reduc t ion

in Cont rac t

Un i t P r ice (See Note

1)

100 or More 0 100 or More 0 100 or More 0 97 – 99 3 98 – 99 2 99 1 94 – 96 6 96 – 97 4 98 2 91 – 93 9 94 – 95 6 97 3 88 – 90 12 92 – 93 8 96 4 85 – 87 15 90 – 91 10 95 5

Less than 85

30 (See Note 2 )

Less than 90

30 (See Note 2 )

Less than 95

30 (See Note 2 )

Notes : (1 ) For i tems measured and pa id fo r by the cub ic yard , the reduc t ion sha l l

no t exceed $150.00 pe r cub ic yard .

(2) I f a l lowed to remain in p lac e.

SECTION 1006

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and qua l i ty o f the concre te is such tha t the concre te shou ld be cons idered acceptab le and be a l lowed to remain in p lace .

I f such ev idence cons is ts o f cores , the cont rac tor sha l l ob ta in th ree cores f rom the concre te represented by the fa i l ing cy l inder s t rength tes t . The cores sha l l be ob ta ined a t no add i t iona l cos t to the Depar tment , under the observa t ion o f an ADOT representa t ive , and de l ivered to the Engineer in t ime to a l low comple te tes t ing o f such cores wi th in 48 days a f te r the p lacement o f the concre te . A l l cores sha l l be ob ta ined and tes ted in accordance wi th the requ i rements o f ASTM C42. Tes t ing sha l l be per fo rmed by the Depar tment . The cont rac tor may e lec t to have a representa t ive present dur ing tes t ing. The concre te represented by the cores wi l l be cons idered fo r acceptance, in accordance wi th the requ i rements o f the tab le above. I f the average compress ive s t rength does no t meet the spec i f ied requ i rement , a l l concre te so represented sha l l be removed a t no add i t iona l cos t to the Depar tment un less permi t ted to remain in p lace by the Engineer . Resu l ts o f the core tes t ing wi l l be b ind ing on bo th the cont rac tor and the Depar tment , and wi l l rep lace the resu l ts o f the tes t cy l inders fo r tha t sample .

1006-7 .04 Sampl ing Frequency for Cast - In-place Concrete:

(A) Class S and Class B Concrete:

For Class S concre te wi th a compress ive s t rength requ i rement less than 4000 pounds per square inch , a sample o f concre te fo r the requ i red tes ts , as spec i f ied in Subsec t ion 1006-7 .02 o f the spec i f i ca t ions , wi l l be taken on a da i ly bas is fo r each 100 cub ic yards , o r f rac t ion thereo f , o f con t inuous ly p laced concre te f rom each ba tch p lan t . For Class S concre te wi th a compress ive s t rength requ i rement equa l to o r grea ter than 4000 pounds per square inch , a sample o f concre te fo r the requ i red tes ts , as spec i f ied in Subsec t ion 1006-7 .02 o f the spec i f i ca t ions , wi l l be taken on a da i ly bas is for each 50 cub ic yards , o r f rac t ion thereo f , o f con t inuous ly p laced concre te f rom each ba tch p lan t . For Class B concre te , a sample o f concre te fo r the requ i red tes ts , as spec i f ied in Subsec t ion 1006-7 .02 o f the spec i f i ca t ions , wi l l be taken fo r each 100 cub ic yards p laced f rom each ba tch p lan t . For Class S or Class B concre te p laced a t e leva t ions o f 3 ,000 fee t o r above, a i r con ten t tes t ing sha l l be per fo rmed fo r each 50 cub ic yards p laced, regard less o f the compress ive s t rength requ i rement . An add i t iona l sample or samples fo r any o f the requ i red tes ts may be taken a t an in terva l o f less than the sampl ing f requency spec i f ied above, a t the d isc re t ion o f the Engineer , on any ba tch or load o f concre te . A sample fo r the requ i red tes ts on da i ly p lacements o f 10 cub ic yards or less may be taken a t the d iscre t ion o f the Engineer .

(B) Class P Concrete:

Class P concre te sha l l be sampled and tes ted fo r compress ive s t rength by the lo t . A lo t sha l l be cons idered to be one sh i f t ’ s p roduc t ion; however , a new lo t sha l l begin when the mix des ign is changed. For par t ia l sh i f ts due to weather o r o ther reasons , more than one day ’s

1195

SECTION 1007

produc t ion may be inc luded in a lo t . When such par t ia l sh i f ts occur , the cont rac tor and the Engineer wi l l jo in t ly de termine the lo t l imi ts . F ive samples sha l l be ob ta ined f rom each lo t a t random loca t ions as d i rec ted by the Engineer . The Engineer may exc lude cer ta in loca t ions f rom random sampl ing i f the Engineer de termines tha t the loca t ion o f the work p rec ludes normal cons t ruc t ion opera t ions . Three tes t cy l inders sha l l be fabr ica ted f rom each sample and tes ted fo r 28-day compress ive s t rength in accordance wi th Subsec t ion 1006-7 .02 o f the spec i f i ca t ions .

Class P concre te sha l l be sampled and tes ted fo r tempera ture , s lump, and a i r con ten t ( i f app l icab le ) a min imum of f i ve t imes per lo t . The f requency may be reduced fo r par t ia l sh i f ts wi th the approva l o f the Engineer . Add i t iona l samples fo r any o f the requ i red tes ts may be taken a t the d iscre t ion o f the Engineer .

(C) Precast Concrete:

A sample o f concre te fo r the requ i red tests as spec i f ied in Subsec t ion 1006-7 .02 o f the spec i f i ca t ions wi l l be taken fo r e i ther each precas t concre te member o r fo r each day 's p roduct ion a t the d isc re t ion o f the Engineer .

An add i t iona l sample or samples fo r any o f the requ i red tes ts may be taken a t the d isc re t ion o f the Engineer . The Engineer wi l l de termine the quant i ty o f concre te represented by each sample o f concre te fo r any test per fo rmed.

When a sample o f concre te fo r the requ i red compress ive s t rength tes t i s taken to represent a s ingle day 's p roduc t ion and no t each precas t member , the degree o f acceptance fo r a l l p recas t concre te members in tha t day 's p roduc t ion wi l l be es tab l ished by the resu l ts o f such compress ive s t rength tes t .