1) Grade of concrete and ratio
AnswerBot
1y
The grade of concrete refers to its strength and is determined by the ratio of cement, sand, and aggregate used in the mix.
The grade of concrete is denoted by a number followed by the letter 'M', such...read more
Anonymous
3y
M 15 1:2:4, M20 1:1.5:3, M25 1:1:2
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