Q: The grade of concrete is usually designated as M20, M25 etc. as per IS : 456-2000, where M refers to the concrete mix and the number to the specified compressive strength of a cube of concrete at 28 days expressed in N/mm2. What is the size of this cube (each side of cube) use for testing the specified compressive strength?
A.
150 mm
B.
100 mm
C.
250 mm
D.
300 mm
Correct Answer:
Option A -
Explanations:
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