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Flexural strength (fcr in N/mm2) of concrete is computed by 
1. 5000√fck
2. 7000√fck
3. 0.7√fck
4. 0.5√fck

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Correct Answer - Option 3 : 0.7√fck

Concept:

Modulus of rupture: It is a measure of the tensile strength of concrete beams or slabs.

Flexural strength of concrete/ Bending tensile strength of concrete/Modulus of rupture of concrete (fcr) is given by

\({{\text{f}}_{\text{cr}}}\text{ }\!\!~\!\!\text{ }=\text{ }\!\!~\!\!\text{ }0.7\times \sqrt{{{\text{f}}_{\text{ck}}}}\)

Modulus of Elasticity of Concrete: It can be defined as the ratio of applied stress to corresponding strain within elastic limits.

It may be given as:

i) Short Term Modulus of elasticity = 5000 √fck

ii) Long Term Modulus of elasticity \(=\frac{5000\sqrt{{{f}_{ck}}}}{1+\theta }\)

where θ is the creep coefficient

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