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Q: In Case of reinforced concrete in sea-water or exposed directly along the sea-coast grade shall be at-least-
  • A. M 20
  • B. M 40
  • C. M 30
  • D. M 25
Correct Answer: Option C - As per IS : 456-2000, Severe Condition :- Concrete surfaces exposed to severe rain, alternate wetting and drying or occasional freezing wet or severe condition. Concrete completely in sea water. Their used min. grade of concrete is M30.
C. As per IS : 456-2000, Severe Condition :- Concrete surfaces exposed to severe rain, alternate wetting and drying or occasional freezing wet or severe condition. Concrete completely in sea water. Their used min. grade of concrete is M30.

Explanations:

As per IS : 456-2000, Severe Condition :- Concrete surfaces exposed to severe rain, alternate wetting and drying or occasional freezing wet or severe condition. Concrete completely in sea water. Their used min. grade of concrete is M30.