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Minimum grade of concrete to be used in reinforced concrete as...

This question belongs to Civil Engineering Concrete Technology And Design Of Concrete Structures
Concrete Technology and Design of Concrete Structures
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Minimum grade of concrete to be used in reinforced concrete as per IS: 456-1978 is

Answer & Solution
Correct Answer: Option B
As per IS: 456-1978, the minimum grade of concrete required for reinforced concrete (RC) structures is M20.

The M20 grade concrete has a characteristic compressive strength of 20 MPa after 28 days of curing.

Lower grades like M15 and M10 are generally used for plain cement concrete (PCC) and are not suitable for reinforced structures.

Higher grades such as M25 and above are used for structural members requiring higher strength.

Hence, the correct answer is M20 (Option B).
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5 Comments
Talha Arshadkhan
Talha Arshadkhan 2 years ago
It's M20
Muhammad Saqib
Muhammad Saqib 6 years ago
According to IS 456 2000 min grade is M20

Acc to IS456 1978 min grade is m15
Ramesh Pathlavath
Ramesh Pathlavath 6 years ago

IS : 456-2000 has recommended that minimum grade of concrete shall be not less than M-20 in reinforced concrete work. Design mix concrete is preferred to ...
Ramesh Pathlavath
Ramesh Pathlavath 6 years ago

IS : 456-2000 has recommended that minimum grade of concrete shall be not less than M-20 in reinforced concrete work.
Ramesh Pathlavath
Ramesh Pathlavath 6 years ago
Check the answer again plz
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