What is meant by the grade of concrete

Question

Accepted Answer

The grade of concrete refers to its strength and is determined by the ratio of cement, sand, and aggregate used in its composition.

The grade of concrete is denoted by a number, such as M20 or M30, where the letter 'M' stands for mix and the number denotes the strength in megapascals (MPa).
The strength of concrete increases with the increase in the grade number.
The ratio of cement, sand, and aggregate used in the mix determines the grade of concrete.
For example, M20 grade concrete has a mix proportion of 1:1.5:3, which means 1 part cement, 1.5 parts sand, and 3 parts aggregate.
The grade of concrete is important in determining the load-bearing capacity of a structure and ensuring its durability.

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