What Is the meaning of M15 and M20

Answer Posted / loganathan

M15, M20, M30-M120 are the grades of CONCRETE. M stands for Mix. The numbers after M represents the STRENGTH OF THE CONCRERTE attained after 28 days of curing. say if it is M20, then the strength of that particular concrete will be 20N/mm2 (Newton per square millimetre)......

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