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Q: Minimum grade of concrete to be used in reinforced concrete as per IS: 456-2000 is:-
  • A. M15
  • B. M20
  • C. M10
  • D. M25
Correct Answer: Option B - As per IS code 456 : 2000, minimum grade of concrete used for RCC is M20, with ratio 1:1.5:3 means 1 part of cement, 1.5 part of sand and 3 part of course aggregate. • As per IS code 456 : 1978, minimum grade of concrete used for RCC is M15. Note- • Min grade of concrete in post-tensioning concrete = M 30 • Min grade of concrete in pre-tensioning concrete = M 40 • Min grade of concrete in sea water construction = M 30
B. As per IS code 456 : 2000, minimum grade of concrete used for RCC is M20, with ratio 1:1.5:3 means 1 part of cement, 1.5 part of sand and 3 part of course aggregate. • As per IS code 456 : 1978, minimum grade of concrete used for RCC is M15. Note- • Min grade of concrete in post-tensioning concrete = M 30 • Min grade of concrete in pre-tensioning concrete = M 40 • Min grade of concrete in sea water construction = M 30

Explanations:

As per IS code 456 : 2000, minimum grade of concrete used for RCC is M20, with ratio 1:1.5:3 means 1 part of cement, 1.5 part of sand and 3 part of course aggregate. • As per IS code 456 : 1978, minimum grade of concrete used for RCC is M15. Note- • Min grade of concrete in post-tensioning concrete = M 30 • Min grade of concrete in pre-tensioning concrete = M 40 • Min grade of concrete in sea water construction = M 30