chapter
23 Pages

TABLE 1. Mix proportion and strength of concrete

A 25 0.25 0.20 111 444 721 1006 111 35.5 96.4 6.42

B 25 0.24 0.20 111 472 721 1006 83 . 40.6 72.8 6.88

C 25 0.47 0.40 160 340 721 1006 60 12.1 64.5 4.95

D 25 0.60 0.60 188 313 721 1006 0 0.0 32.2 3.14

E 25 0.65 0.65 227 349 721 1006 0 0.0 21.4 2.88

F 5 0.25 0.20 111 444 721 1006 111 57.0 105.9 6.08

G 5 0.47 0.40 160 340 721 1006 60 28.0 58.8 3.82

H 5 0.65 0.65 227 349 721 1006 0 0.0 20.9 2.35

I - 0.25 0.20 111 444 721 0 111 57.0 110.7 6.13

J - 0.47 0.40 160 340 721 0 60 28.0 46.3 3.84

K - 0.65 0.65 227 349 721 0 0 0.0 33.8 2.67

GF' = (FtWl + S1v 2 ) /2 (2)

U<D

E</)c D

first softening branch

softening tail traction free

Wi ^ O pening d isp la c e m e n t

1e 180

5 160

O 140

E?120 a> © 100

80 <D k_D O 2 60

■ I / ( O ■ i / y i t

7 ^ 0 s E

n 1 " P>

/ ! 1/ X

( \ X X

/

8-— © F t 0 S,

©

©

©

( 3) ® (<>)

nn

[3 0 0o 0 0

0.15

0.1

0.05

wi ,w2 (mm)

0 20 40 60 80 100 120 fc (MPa) (dmax 25mm)

(2)

/T\

. . I 0 ' *1

h2

<5i>

Cs) © ©

[3 0 0 0 20 40 60 80 100 120

fc (MPa) (dmax 25mm)

10 Ft,Si (MPa)i i © F t 0 S,

©

<S)

( d)

[3 E ] 0

20 40 60 80 100 120 fc (MPa) (dmax 5mm)

0.2

0.15

0.1

0.05

w 1,w2 (mm) 1

0 ' © '

Wi *2

(2) <£)

©

[E ] 0 20 40 60 80 100 120

fc (MPa) (dmax 5mm)

10 Ft,Si (MPa)

8 —

I I © Ft 0 Si

©

©

©

0 0 0

20 40 60 80 100 120 fc (MPa) (mortar)

0.2

0.15

0.1

0.05

W1 >w2 (mm)

0 © '

\ wi W 2

© ©

0 0

©

0 20 40 60 80 100 120

fc (MPa) (mortar)

0 J X

ooLlI

S o , '

*' A

©

S o S o

© dma: 0 dma:

< 25mm < 5mm

2 3 4 5 6 Ed (MPa) x10 3

T><D

Opening displacement

FIGURE 6 Two components in Gp * ,

o

O.B

0.6

e> - 0.4-> li-CS

& 0.2

(*) A <3iD © ■

I

m

!