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Question
At what stress does the first flexural crack appear in RCC beam made of M25 grade concrete?
A.
3.0 MPa
B.
3.5 MPa
C.
4.0 MPa
D.
4.5 MPa
Answer ( Option B)

3.5 MPa

Solution

For concrete:
fcr = 0.7 ×√Fck
For M25 concrete:
fcr = 0.7 × √25
fcr = 0.7 × 5
fcr = 3.5 MPa

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