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Q: For underwater concreting, the water cement ratio shall not exceed:
  • A. 0.7
  • B. 0.9
  • C. 0.6
  • D. 0.75
Correct Answer: Option C - AS per IS 456 : 2000 Cl. 8.2.2.1 concrete exposed to condensation and rain, concrete continuity underwater is considered moderate environment exposure conditions. • For moderate exposure condition water cement ratio is taken 0.60 in plain concrete and 0.50 taken reinforced cement concrete.
C. AS per IS 456 : 2000 Cl. 8.2.2.1 concrete exposed to condensation and rain, concrete continuity underwater is considered moderate environment exposure conditions. • For moderate exposure condition water cement ratio is taken 0.60 in plain concrete and 0.50 taken reinforced cement concrete.

Explanations:

AS per IS 456 : 2000 Cl. 8.2.2.1 concrete exposed to condensation and rain, concrete continuity underwater is considered moderate environment exposure conditions. • For moderate exposure condition water cement ratio is taken 0.60 in plain concrete and 0.50 taken reinforced cement concrete.