2.5 details of asphalt institute method of design of flexible pavements.pptx

7/25/2019 2.5 Details of Asphalt Institute Method of Design of Flexible Pavements.pptx

1/55

2.5 Details of Asphalt Institute Method ofof Flexible Pavements Historical Development of AI Method

1956 1969

1st

to 8th

Editions Empirical Approach 1970 Revised 8thEdition - Empirical Approach

Thickness Design Full Depth Asphalt Pavement Structures for Streets, The Asphalt nstitute, !anual Series "# $!S"#%

ther !ersions

1981 9thEdition, M-E Approach

1991 Revised 9thEdition1999 9thEdition, Reprint

2001 Revised 9thEdition

2008 Revised 9thEdition

Thickness Design Asphalt Pavement for Highways and Streets

nstitute, !anual Series "# $!S"#%le!i"le #avement $esi%n Methods& #repared "' Ra(esh )had*a,acem2+12+16


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le!i"le #avement $esi%n Methods& #repared "' Ra(esh )had*a,acem

"#$% and &arlier &ditions "#'" and (ater &ditio

2+12+16


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A Method is .sed to desi%n asphalt pavements composcom"inations o/&

a asphalt concrete s.r/ace and "ase

" Em.lsied asphalt s.r/ace and "ase

c 3ntreated a%%re%ate "ase and s."-"ase4

2+12+16 le!i"le #avement $esi%n Methods& #repared "' Ra(esh)had*a, acem

&mulsi)ed asphalt is simply a suspension of small asphalt cement glo&

which is assisted &y an emulsifying agent $such as soap%' The emuassists &y imparting an electrical charge to the surface of the asphalt ceso that they do not com&ine $(o&erts et al', #))*%'


4/55

Design Principles #avement is re%arded as M*(+I,(A-&&D &(A/+I0 /-/+&M4

$esi%n #roced.re is "ased on Esta"lished heor', E!perience, e

omp.ter #ro%ram $AMA ere .sed to develop a comprehensdesi%n proced.re4

Materials in each la'er are characteried "' Mod.l.s o/ Elasticit', ERatio, ;4

raa'ers inite hic*ness nnite in oriontal $irections4

.ll ontin.it' =.ll riction is Ass.med at the "o.ndaries "eteela'er42+12+16le!i"le #avement $esi%n Methods& #repared "' Ra(esh

)had*a, acem


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Design 0riteria

oriontal ensile ?train, Ct on the 3nderside o/ the >o

Do.nd >a'er sho.ld "e ithin the #ermissi"le @al.e4 / E!cessive rac*in% o/ the reated >a'er ati%.e ail.r

@ertical ompressive ?train, Cc at the ?.r/ace o/ the ?."

sho.ld "e s.ch that E!cessive #ermanent $e/ormation =R.

not a*e #lace d.e to Bverloadin%4

2+12+16 le!i"le #avement $esi%n Methods& #repared "' Ra(esh )had*a,acem


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Fatigue 0riterion4 Fatigue 0rac6ing

he eF.ation /or /ati%.e criterion is&

f7 %.%$#89:t;,.2#"9&;,%.'5 4



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/ub,grade &valuation

DR Resilient Mod.l.s



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/ubgrade /trength &valuation

he correlation considered reasona"le /or ne %rained sosoa*ed DR o/ 10 or less is&

M 9MPa; 7 "%. x 0> 9?; @AA/H+ #



15/55


+ra=c (evel 9&A(; Des

/ubgrade !alueB ?

10 or >ess 60

Deteen 10and 106 75

106or More 8745

sign Percentile for !arious &/A(s


16/55

AI C Design 0harts

he A desi%n proced.re is "ased on a series o/ charts that /rom comp.ter pro%rams /or la'ered elastic s'stems4

Reasona"le properties ere ass.med /or the properties o/ the and o/ the "ase and s.""ase co.rses4

h.s, the desi%n varia"les treated in the anal'sis o/ a %iven pare s."%rade MRand tra /or temperat.res, MAA =7, 1



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2+12+16le!i"le #avement $esi%n Methods& #repared "' Ra(esh )had*a,

acem


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acem

i i hi 6 f l


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Minimum +hic6ness of HMA over &mulsAsphalt >ases

+ra=c

(evel &/A(

+hic6ness

for +3pe IMix

+3pe II +3pe III

n4 mm n4

"%< 140 50 2"%5 145 50 2

"%8 240 75 "%$ 240 100

"%$ 240 10 5


acem

Mi i +hi 6 f A h l 0


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Minimum +hic6ness of Asphalt 0oncretover *ntreated Aggregate >ase

+ra=c &/A( +ra=c 0ondition Minimum

+hic6ness of

Asphalt0oncrete 9mm;

"%< >i%ht tra


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Numerical Example - 1

A pavement has to &e designed for a certain length of e-isting single laroad from the following considerations.

a%/urrent tra+c of 01 k2 e3uivalent single a-le load 4 1'5* - A67day&%Design period 4 #1 years

c%/onstruction period 4 #0 months from the last tra+c count

d%Tra+c growth rate 4 08

e%09':th/;( values of su&grade soil from seven samples collected 4 :8

f% lastic modulus of asphalt concrete for surface course, ac4 5:11 !P

g%lastic modulus of emulsi ?18%, s&4 #:1 !Pa

Draw the cross"section of


29/55

Solution:1 .m.lative Ho4 o/ ?tandard A!les to "e atered

H I ! A ! $

or, 7 x Px D

Here,

# I 0426 ! EA>+da'

r I 8 I 0408

n I 10 'ears

' I 18 months I 18+12 I 145 'ears

$ I 1 =Since a Single lane carriageway road =as per R& 7 2001hen, 7 x %.28x"% x "

7 ".5< x &A(

le!i"le #avement $esi%n Methods& #repared "' Ra(esh)had*a, acem2+12+16


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2 8745thDR val.es o/ s."%rade soil /rom seven samples c5

here/ore, $esi%n Resilient Mod.l.s o/ ?."%rade, Mr7 "%. x

=in M#a

I 104 ! 5 I 5".5 MPa

or 7 ".5< x &A( andMr7 5".5 MPaB /rom the %iven

Full Depth of Asphalt 0oncrete 7 25% mm

Ho, adopt

A ?.r/ace o.rse I 50 mm

le!i"le #avement $esi%n Methods& #repared "' Ra(esh )had*a,acem2+12+16

Ho EF.ivalent thic*ness o/ em.lsied sta"ilied "ase co.rse


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Ho, EF.ivalent thic*ness o/ em.lsied sta"ilied "ase co.rse

I ! I ! 200

I 2554 mm

3se "


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5 hen , EF.ivalent thic*ness o/ %ran.lar s.""ase co.rse, =N 0 I ! I ! 115

7

le!i"le #avement $esi%n Methods& #repared "' Ra(esh

)had*a, acem

A ?.r/ace o.rse, EacI 255% mm

"


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le!i"le #avement $esi%n Methods& #repared "' Ra(esh )had*a,

acem2+12+16

N i l E l 2


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The results of eight tests produced the following su&gmodulus values. @5'0, )?'5, *1'9, 05'#, :?'0, 91'1, *:'* aDesign the e-i&le pavement using Asphalt nstitute !etho

lane 5"way road to cater the tra+c with the following conside

a% ;ase tra+c of 01 k2 e3uivalent single a-le load 4 0'5 - #1

&% Design period 4 #1 years

c% /onstruction period 4 #: months from the last tra+c coun

d% Tra+c growth rate 4 98e% !inimum depth of asphalt concrete wearing course with t

elasticity of 5:11 !Pa 4 9: mm

f% mulsi


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Solution Hints:


14 #.t the test resilient mod.l.s val.es in descendin% order

esilientModulusB MPa

umber eual toor greater than

Percent eual toor greater than

942 1 = ! 100 I 1245

8241 2 = ! 100 I 2540

7840 = ! 100 I 745

6940 = ! 100 I 5040

6546 5 = ! 100 I 6245

6047 6 = ! 100 I 7540

5.' 7 = ! 100 I '$.5

248 8 = ! 100 I 10040




942 1

8241 2

7840

6940

6546 5

6047 6

5.' 7

248 8

rom the a"ove ta"le, '$.5thpercentile resilient modulus value for the des

2+12+16

2 .m.lative Ho o/ ?tandard A!les to "e atered


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24 .m.lative Ho4 o/ ?tandard A!les to "e atered

H I ! A ! $

or, 7 x Px D 7 G

Here,

# I 842 ! 10E?A>+'ear

r I 7 I 0407

n I 10 'ears

' I 15 months I 15+12 I 1425 'ears

$ I 1 =Since a Single lane carriageway road =as per R& 7


acem2+12+16


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4 8745thpercentile resilient mod.l.s val.e /or the desi%n,

Mr7 548 M#a

or 7 G andMr7 5".5 MPaB /rom the %iven $esi%n haFull Depth of Asphalt 0oncrete 7 G

hen, /ollo the steps as e!plained in H.merical E!am


)had*a, acem2+12+16



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Numerical Example - 3The results of eight tests produced the following su&grade resilient m*511, 9011, 0011, ):11, #1111, ##?11, ##)11, and #?:11 psi' Des

pavement using Asphalt nstitute !ethod for a single lane 5"way rotra+c with the following considerations.

a% ;ase tra+c of 01 k2 e3uivalent single a-le load 4 1'55 - #1?SA

&% Design period 4 #: years

c% /onstruction period 4 #0 months from the last tra+c count

d% Tra+c growth rate 4 9':8

e% !inimum depth of asphalt concrete wearing course with t

elasticity of 5*11 !Pa 4 9: mm

f% mulsi


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Solution Hints:


acem

". 0omputation of Percentile !alue

2+12+16

2 raphical determination of design subgrad


40/55

2. raphical determination of design subgradresilient modulus


#%

$9?;



642 1 = ! 100 I 1647

54 2 = ! 100 I 4

540 = ! 100 I 5040

41 = ! 100 I 6647

4 5 = ! 100 I 84

40 6 = ! 100 I 100

0>9?;



642 1

54 2

540

41

4 5

40 62+12+16

rom the interpolation or /rom the plot "eteen percent eF.al to or %reater than vs


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rom the interpolation or /rom the plot "eteen percent eF.al to or %reater than vs

percentileDesign /ubgrade 0> !alue 7 .2?.

here/ore the $esi%n ?."%rade Resilient Mod.l.s,

MrI 104 ! 42 Mpa

2 .m.lative Ho4 o/ ?tandard A!les to "e ateredH I ! A ! $

or, 7 x Px D 7 G

Here,

# I 1408 ! EA>+da'

r I 7 I 0407

n I 10 'ears' I 1 'r4

$ I 0475 =Since two lane carriageway road =as per R& 7 2001

or 7 G andMr7 MPaB /rom the %iven $esi%n hart, B"tainFull Depth of A

7 G

hen, /ollo the steps as e!plained in #revio.s E!amples4


)had*a, acem2+12+16



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Numerical Example - 5/alculate the accumulated e3uivalent single a-le load for alane rural highway' The


45/55

Solution:

1 alc.lation o/ Oroth actor

F 7 I I .%8


)had*a, acem

/.

!ehicle +3pes o. of !ehiclesfor "st-ear of

peration

+ruc6FactorB

+F

F &/A(

9"; 92; 9; 9"; J 9x 9;

";

/ingle *nit+ruc6s

a%

5"A-le, @"Tire )0,::1 1'15 ??'1*

*:,#*

&%

5"A-le, *"Tire @?,011 1'5# ??'1*

?,1@,*

c%

?"A-le or !ore 5#,)11 1'9? ??'1*

:,50,:?

2

;

+ractor

/emitrailers and2+12+16

/ample 0alculation4 !alues *nder 0olumn


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/ample 0alculation4 !alues *nder 0olumn

=o"tained /rom the rst 'ear AA$ and the desi%n lane /actor or 2-lane hi%ha', desi%n lane /actor, fdI 50 I 045

For -ample. or 2,AxleB 8,+ire /ingle *nit +ruc6s, the Hd.rin% rst 'ear o/ operation $i'e at the end of the construct

x 85 x ? of !ehicles x fd

I 000 ! 65 ! 0408 ! 045 I


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Numerical Example 6

(esults of seven tests produced the following su&grade resiltest values @@'0, *9'?, *0'?, :0'*, *0'?, #1*') and 01'1 !Pclassi


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Design the e-i&le pavement using Asphalt nstitute !ethod for two lane cater the a&ove tra+c with the following details.

a% !inimum depth of Asphalt /oncrete wearing course with modulus of!Pa 4 :1 mm

&% mulsi


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Solution Hints:14 Oroth /actor I I I "$.$

24 alc.lation o/ E?A>

le!i"le #avement $esi%n Methods& #repared "' Ra(esh)had*a, acem

o. of !ehicles9both directions;

+ruc6Factor

rothFactor

&/A(9"; J 92; x 9

=1 =2 = =

000 0400 1747 2084

2050 04280 1747 997048

1000 14060 1747 181242

1100 04620 1747 11864

1200 14050 1747 2188642

+otal 9; 822.58 78.2258 x "2+12+16

4 alc.lation o/ 8745th#ercentile $esi%n ?."%rade Resilient Mod.l.s, Mr

#.t the test resilient mod.l.s val.es in descendin% order&


50/55

#lot "eteen #ercent eF.al to or %reater than vsMrto %et 8745th#ercentile $esi%n ?."%rade Resilient Mod.l.s4

or andMr/rom the %iven $esi%n hart, B"tainFull Depth of Asphalt 0oncrete. hen, /ollo the steps as e!plaE!amples4


)had*a, acem




10649 1 = ! 100 I 1428

8040 2 = ! 100 I 28457

684 = ! 100 I 2485

684 = ! 100 I 5741

674 5 = ! 100 I 7142

5846 6 = ! 100 I 85471

48 7 = ! 100 I 100




10649 1

8040 2

684

684

674 5

5846 6

48 7

2+12+16



51/55

p

/alculate the accumulated e3uivalent single a-le load for a prhighway' Tra+c volume forecasts indicate that the averagetra+c $AADT% in &oth directions during the


52/55

"; 0alculation of roth FactorB F4

F 7 I I 2#.$'

2 #ercenta%e r.c* @ol.me on $esi%n >ane, fdI 5 =Ass.me PRan%e I 25

>anes

; o. of &uivalent Accumulated Axle (oads in the Design (ane

7 AAD+ x F x ? of !ehicles x 85 x x F&x fd

a #assen%er ars I 12000 ! 29478 ! 045 ! 65 ! 2 ! 0400002 ! 045 7%.%%

" 2-A!le ?in%le .nit r.c*s I 12000 ! 29478 ! 04 ! 65 ! 2 ! 0400500 ! 04

c -A!le ?in%le .nit r.c*s I 12000 ! 29478 ! 0417 ! 65 ! ! 0401960 ! 04+otal &/A( 7 %.$'" x "%8

Note: t can "e seen that the contri".tion o/ passen%er cars to the E?A> is passen%er cars can "e omitted hen calc.latin% E?A> val.es4


)had*a, acem

2+12+16


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le!i"le #avement $esi%n Methods& #repared "'

Ra(esh )had*a, acem

2+12+16


54/55


acem


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2+12+16le!i"le #avement $esi%n Methods& #repared "' Ra(esh

)had*a, acem

2.5 details of asphalt institute method of design of flexible pavements.pptx

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