What does M10, M15, M20, M25, M7.5 mean in concrete?
The mixes of grades M10, M15, M20 and M25 correspond approximately to the mix proportions 1:3:6 (1 cement : 3 Sand: 6 stone), 1:2:4 (1 cement : 2 Sand: 4 stone), 1:1.5:3 (1 cement : 1.5 …
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