Multiple choice

The modulus of rupture of concrete in terms of its characteristic cube compressive strength (fck) in MPa according to IS 456 : 2000 is

  1. 5000fck

  2. 0.7fck
  3. $5000 \sqrt{f_{ck}}$
  4. $0.7 \sqrt{f_{ck}}$
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D Correct answer
Explanation

 $\text{Modulus of rupture of concrete}\\ \hspace{2cm} \sigma_{cr} = 0.7 \sqrt{\sigma_{ck}}\\ or \hspace{1.5cm} f_{cr} = 0.7 \sqrt{f_{ck}}\\ \text{Maximum tensile stress due to flexural in concrete is given by above formula and also known as modulus of rupture of concrete.}$

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