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Grades Of Concrete

Grades Of Concrete:

In IS: 456-1978, the different grades of concrete are given as M10, M25, M20, M25, M30, M35, and M40. In the classification of concrete mix, the letter M denotes the Mix and the numbers 10, 15, 20, 25, 30, 35, 40 represent the predetermined works cube strength of 15 cm cubes after curing of 28 days in N/mm2.


The works cube strength refers to the strength achieved by the concrete after 28 days curing. It can also be defined as the crushing strength of concrete cubes at 28 days. The compressive strength of the concrete should not be greater than 5% of the test results are expected to fall. The list of specified concrete grades are given below:

                   Grade Of Concrete Specified Compressive Strength At 28 Days (N/mm2)
M10 10
M15 15
M20 20
M25 25
M30 30
M35 35
M40 40

Note 1: M5 and M7.5 concrete also exist which can be used in lean concrete bases/mud and for ordinary masonry wall foundation.

Note 2: Concrete grade less than M15 should not use in reinforced concrete.

Note 3: M10, M15, M20…. concrete approximately equal to 1:3:6, 1:2:4, 1:1.5:3… nominal mix.

Also Read – Concrete Mix Design: Design Mix Concrete & Nominal Mix Concrete
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Comments ( 9 )

  1. This is very helpful and support to me in increase the knowladge in field of best civil engineering works.
    I hardly thank you sir in my harts.

  2. nice site. knowledgable things given here. thnku very much for sharing valuable things.
    plz load other subjects related to civil here.

  3. This site have made me to have more confidence in my self as an engineer, thanks to those that are putting their efforts back there for us to smiling at the other end.

  4. Very informative. Can anyone tell me whether the grade of concrete has any influence on the impact strength of concrete? Does increasing the grade of concrete increases the impact strength? Thanks a lot.

  5. Dear Concern,
    Thanks to given such a information but i need to know that which Grade concrete we can use to make the concrete holo bricks.

  6. IT is given as a note that we should not use concrete grades less than M15. Why is it so?

  7. Helpful article ,thank you

  8. Helpful, knowledgeable, very practical to working people’s.many Many thanks.

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