What is the Hardness of M-40 grade concrete, general and
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Answer Posted / Umesh Kumar Morya
The hardness of M-40 grade concrete is 20 MPa (Megapascals) according to Indian Standard specifications. Compressive strength, however, is a more commonly used measure for concrete strength, and for M-40 grade concrete it would be 40 N/mm^2 (Newtons per square millimeter).
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