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Question
The permissible value of local bond stress for M20 cement concrete is :
A.
1.2 N/mm2
B.
1.4 N/mm2
C.
1.7 N/mm2
D.
1.5 N/mm2
Answer ( Option A)

1.2 N/mm2

Solution

As per IS 456 C1 26.2.1.1, Design Bond stress

Grade of concrete

(tbd) Permissible (WSM)

(tbd) Permissible (LSM)

M-15

M-20

M-25

M-30

M-35

M-40

M-45

M-50

0.6

0.8

0.9

1.0

1.1

1.2

1.3

1.4

-

1.2

1.4

1.5

1.7

1.9 Þ for M-40 and above

 

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