What is min. Grade of concrete for super structure?

[Azad]

As per IS code.what should be nominal mix of concrte grade as per IS code

 

[Dnyan Deshmukh]

Minimum grade of concrete for doing RCC works varies as per the Exposure conditions.

As per IS 456, following are the minimum grade of concrete for various exposures;

Minimum Grade of Concrete for RCC	Exposure Condition
M20​	Mild​
M25​	Moderate​
M30​	Severe​
M40​	Very Severe​
M45​	Extreme​