What is the ratio of Grades M10,M15,M20,M25,M30,M35,M40.
Answer Posted / durga prasad akula
M5 -1:5:10
M7.5-1:4:8
M10 -1:3:6
M15 -1:2:4
M20 -1:1.5:3
M25 -1:1:2
M30 -1:1/2:1
Upto M20 we have to follow this ratio no problem, but after M20 we should better go to design mix means it's better for structure strength and durability.
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