We use different grades of concrete for different parts of the building.

We could say the grade of concrete is the only thing we do care lot while concreting.

In this post, we are going to explain that in detail.

Grades of Concrete

Actually, what do we mean by grade of concrete.?

Concrete grades are denoted by M10, M20, M30 according to their compressive strength.

The “M” denotes Mix design of concrete followed by the compressive strength number in N/mm2

“Mix” is the respective ingredient proportions which are Cement: Sand: Aggregate Or Cement: Fine Aggregate: Coarse Aggregate.

we already discussed the mix design here.

If we mention M10 concrete, it means that the concrete has 10 N/mm2 characteristic compressive strength at 28 days.

 

Note

The Minimum grade of concrete for Plain Cement Concrete (PCC) is M15

The Minimum grade of concrete for Reinforced Cement Concrete (RCC) is M20

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Concrete Grade and Mix Ratio Table

As per IS 456:2000, the grades less than M20 should not be used in RCC works

Group	Concrete Grade	Mix Ratio	Characteristic Compressive Strength (N/mm2)
Ordinary Concrete	M5	1 : 5 : 10	5 N/mm2
	M7.5	1 : 4 : 8	7.5 N/mm2
	M10	1 : 3 : 6	10 N/mm2
	M15	1 : 2 : 4	15 N/mm2
	M20	1 : 1.5 : 3	20 N/mm2
Standard Concrete	M25	1 : 1 : 2	25 N/mm2
	M30	Design Mix	30 N/mm2
	M35	Design Mix	35 N/mm2
	M40	Design Mix	40 N/mm2
	M45	Design Mix	45 N/mm2
	M50	Design Mix	50 N/mm2
High Strength Concrete	M55	Design Mix	55 N/mm2
	M60	Design Mix	60 N/mm2
	M65	Design Mix	65 N/mm2
	M70	Design Mix	70 N/mm2

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