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Reinforced Cement Concrete

Tensile Strength of Concrete

At what stres...

Question

At what stress does the first flexural crack appear in RCC beams made of M25 grade concrete?

A

3.0 MPa

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B

3.5 MPa

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C

4.0 MPa

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D

4.5 MPa

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Solution

The correct option is B 3.5 MPa
Flexural strength of concrete is given by
$f_{c r} = 0.7 \sqrt{f_{c k}} = 0.7 \sqrt{25} = 3.5 M P a$

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