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Q: According to I.S. : 456, the number of grades of concrete mixes, in standard concrete –––––––
  • A. 3
  • B. 4
  • C. 5
  • D. 7
Correct Answer: Option D - As per IS : 456-2000, Clause 6.1, Ordinary Concrete - M10, M15, M20. Standard Concrete - M25, M30, M35, M40, M45, M50, M55, High Strength Concrete - M60, M65, M70, M75, M80. Note : As per latest amendment M60 has been shifted to standard concrete and M85, M90, M95, M100 has been added to high strength concrete.
D. As per IS : 456-2000, Clause 6.1, Ordinary Concrete - M10, M15, M20. Standard Concrete - M25, M30, M35, M40, M45, M50, M55, High Strength Concrete - M60, M65, M70, M75, M80. Note : As per latest amendment M60 has been shifted to standard concrete and M85, M90, M95, M100 has been added to high strength concrete.

Explanations:

As per IS : 456-2000, Clause 6.1, Ordinary Concrete - M10, M15, M20. Standard Concrete - M25, M30, M35, M40, M45, M50, M55, High Strength Concrete - M60, M65, M70, M75, M80. Note : As per latest amendment M60 has been shifted to standard concrete and M85, M90, M95, M100 has been added to high strength concrete.