Meaning of m20 and m200 concrete

Answer Posted / naushad bashir mir

M20 means itz an ordinary concrete.M refers to the mix and number (20) represents the characteristic compressive strength of concrete N/mm2 which means 20N/mm2 .And also one thing there is not any m200
Concrete had only 15 grades M10 M15 M20 M25 M30 M35 M40 M45 M50 M55 M60 M65 M70 M75 M80

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