Civil Engineering MCQJE Level Civil Engineering
M20 grade concrete with OPC has a 28-day characteristic cube compressive strength of:
RCCRCCEASY
Choose the correct answer
A
20 MPa cube strength (characteristic, 28 days)
B
20 MPa cylinder strength
C
20 MPa at 7 days
D
20 kPa
Correct Answer
A. 20 MPa cube strength (characteristic, 28 days)
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The designation M20 directly means fck = 20 N/mm² (MPa) from 150 mm cubes at 28 days. M stands for mix and the number is the characteristic strength. M20 is the minimum grade for reinforced concrete in mild exposure per IS 456.
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