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What Is the meaning of M15 and M20

Answer Posted / balu

M refers to the Mix. The number followed after M refers to the Characterstic compressive strength obtained of concrete casted in 150 x 150 x 150 mm standard moulds after 28days. Ex. M15 is 15 N/Sq.mm is the Characterstic Compressive Strength after 28 days reqd.

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