Civil Engineering MCQAE Level Civil Engineering
The characteristic compressive strength of concrete (f_ck) is defined as the strength below which not more than ___% of test results fall:
RCCCharacteristic StrengthMEDIUM
Choose the correct answer
A
10%
B
5%
C
1%
D
15%
Correct Answer
B. 5%
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As per IS 456, f_ck is the value below which only 5% of the test results are expected to fall. It is determined as f_ck = f_mean - 1.65σ for a normal distribution.
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