The minimum grade of concrete is to be used in reinforced concrete as per (IS 456 : 2000)

M 15

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M 20

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M 10

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M 25

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Solution

The correct option is B M 20
As per IS 456 : 1978, minimum grade of concrete to be used in RCC is M 15.
But after revision of code, IS 456 : 2000, it is M 20.

Note : For prestressed concrete :
Min.grade for pre tensioning prestressed concrete - M 40
Min. grade for post tensioning prestressed concrete - M 30.

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M 35

I S 456 - 2000

\frac{k g}{m^{3}}

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