Civil Engineering MCQJE Level Civil Engineering
The characteristic strength of M30 concrete corresponds to a cube test strength of:
Building MaterialsBuilding MaterialsEASY
Choose the correct answer
A
25 MPa
B
30 MPa
C
35 MPa
D
40 MPa
Correct Answer
B. 30 MPa
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fck = 30 MPa for M30. Characteristic strength = value below which 5% results may fall. Target mean strength = fck + 1.65σ where σ = standard deviation (typically 4–5 MPa for good quality control). So target strength ≈ 30 + 8 = 38 MPa on average.
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