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Reinforced Cement Concrete

Characteristic Compressive Strength of Concrete -II

Flexural crac...

Question

Flexural cracks appear at bottom of beam at a tensile stress of 3.13 MPa. Find the Design compressive Strength of concrete
( MPa)

A

11.25

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B

9

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C

10.25

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D

8.5

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Solution

The correct option is B 9
Crack appear at $f_{c r} = 3.13 = 0.7 \sqrt{f_{c k}}$

$f_{c k} = 20 M P a$

Design compressive strength = $0.45 f_{c k}$

So, design compressive strength $= 9 M P a$

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