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Properties of Fresh Concrete

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*+,-(+.(/ '0 1'+23 4#(Workability Workability

Slump Loss Segregation/Bleeding Plastic Shrinkage Plastic Shrinkage

Time of Set Temperature Temperature -Curing

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!(?$# '$@ A'+@($"$#

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!2;:- B(/0

C$D(+0(@ &,$(

%22 "0 ;- >"06 06+(( 2'3(+/

,5 (E;'2 D,2;:(

+,@ ('&6 2'3(+ FG .:(/

/&+'-( ,H 06( /;+5'&(

8

4

12

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!2;:- 0(/0

Slump

Ruler

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!2;:- B(/0

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!2;:- 0(/0 +(/;20/ /.H IJFK

:'//"D( /(&.,$/L 2"M2( +("$5,+&(:($0

;/( D"9+'.,$ :(@";: FJGK

&,2;:$/L 9(':/L +(0'"$"$# >'22/

N2;"@ GJOK

6('D"23 +("$5,+&(@ /(&.,$L =,>'92( &,$&+(0(

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>'0(+ &(:($0 +'.,"5 3,; '@@ ZI #'22,$/ ,5 >'0(+ -(+ &;9"& 3'+@ '0 [,9 /"0(L

06($S

(R0+' >'0(+ZI #'22,$/P&;9"& 3'+@ \ ]YUW 2"0(+/P#'22,$^ \ ]FUF 29/UP8#^ \

] Z8#P2"0(+^ Q WYUOO 29/U

0,0'2 >'0(+ FWF _ WYUOO Q YVGUOO$(> >P& Q YVGUOO P VWG Q IUGYX `` IUXY

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N'&0,+/ 'H(&.$# /2;:-J

-'/0( &,$0($0 &,$/0'$0 >'0(+ &(:($0 +'.,

"$&+('/( -'/0( &,$0($0

"$&+('/( /2;:-

ab cbbd

&,$/0'$0 &(:($0 &,$0($0

"$&+('/( >'0(+ &,$0($0

"$&+('/( /2;:-

ab cbbd

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N'&0,+/ 4H(&.$# !2;:-J

7'0(+ '0(+ '0 06( &,$/0'$0 &(:($0 &,$0($0L >P

& "$&+('/(/L /2;:- "$&+('/(/U

4@@ >'0(+ '0 ' &,$/0'$0 >'0(+ &(:($0 +'.,L6'D( 0, "$&+('/( &(:($0 '/ >(22L /2;:-

"$&+('/(/U

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4@:"R0;+(/ /(0 +(0'+@"$# '@:"R0;+(/

/(0 '&&(2(+'.$# '@:"R0;+(/

>'0(+ +(@;&"$# '@:"R0;+(/ /;-(+-2'/.&"e(+/

'"+ ($0+'"$"$# '@:"R0;+(/

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N'&0,+/ 'H(&.$# /2;:- 4##+(#'0(/

#+'@"$# 06( 2'+#(+ 06( -'+.&2( /"e(L 06( 6"#6(+ 06(

/2;:- 5,+ ' #"D($ -'/0( &,$0($0

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f2((@"$# '$@ !(#+(#'.,$

!(#+(#'.,$S &,'+/( '##+(#'0( 0($@/ 0, /(#+(#'0( @;(

0, #+'D"03U B3-"&'2 ,5 @+3 :"R(/U

f2((@"$#S >'0(+ +"/"$# 0, 06( /;+5'&(U B3-"&'2 ,5 >(0

:"R(/U

76($ (R&(//"D(L &(:($0 -'+.&2(/ '$@ >'0(+ #, 0,

06( /;+5'&( -,+,/"03 #,(/ ;- g -'/0( &'$ ('/"23 9(

'9+'@(@ JJ` @;/.$#U

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!(#+(#'.,$

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f2((@"$# '$@ "0/ &,$0+,2

(($

0>, 2'3(+/

! causes

! lack of fines

! too much water content

! Remedies

! more fines

!

adjust grading

! entrained air

! reduce water content

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4"+

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1'+23J4#( h,2;:(

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N+(( !6+"$8'#(L

&';/(/ D,2;:( &6'$#(L 9;0 $, /0+(//(/

before shrinkage After Shrinkage

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i(/0+'"$(@ !6+"$8'#(J &+('0(/ /0+(//(/L >6"&6

:'3 &';/( &+'&8"$#

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i(/0+'"$(@ /6+"$8'#( &+'&8"$#

Parallel cracking perpendicularto the direction of shrinkage

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'0(+ (D'-,+'0(/ 5'/0(+ 06'$ "0 &'$ +('&6 06(

0,- /;+5'&(

@+3"$# >6"2( -2'/.& &+'&8"$#

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*2'/.& !6+"$8'#(

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B(:-(+'0;+( (H(&0/ ,$ &;+"$#

B6( 6"#6(+ 06( 0(:-(+'0;+( 06( 5'/0(+ 06( &;+"$#

9(/0 0(:-(+'0;+( "/ +,,: 0(:-(+'0;+(

/0+,$#(/0 &,$&+(0( "/ :'@( '0 0(:-(+'0;+( '+,;$@

XI NU]$,0 -+'&.&'2^

C5 &,$&+(0( 5+((e(/ @;+"$# 06( %+/0 FX 6+/UL "0 :'3

$(D(+ 9( '92( 0, 'M'"$ "0/ ,+"#"$'2 -+,-(+.(/U

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B(:-(+'0;+( (H(&0/ ,$ &;+"$#

+('2 6"#6 0(:-(+'0;+(/ '9,D( ZFI N &'$ &';/(

/(+",;/ @':'#( /"$&( &(:($0 :'3 /(0 0,, 5'/0U

'&&(2(+'0(@ &;+"$# -+,&(@;+(/ -+,@;&( /0+,$#

&,$&+(0(L 9;0 @;+'9"2"03 :"#60 /;H(+U

';0,&2'D( &;+"$#U