# Grades of Concrete with Proportion (Mix Ratio)

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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