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Q: Which of the following cement is used when concrete is to be laid under water of in running water?
  • A. Low heat Portland cement
  • B. White Portland cement
  • C. Masonry cement
  • D. Quick setting Portland cement
Correct Answer: Option D - Quick setting cement– The quantity of gypsum is reduced and small percentage aluminium sulphate is added, it is ground much finer than ordinary portland cement. Properties– Initial setting time = 5 minutes Final setting time = 30 minutes Use– It is used when concrete is to be laid under water or in running water.
D. Quick setting cement– The quantity of gypsum is reduced and small percentage aluminium sulphate is added, it is ground much finer than ordinary portland cement. Properties– Initial setting time = 5 minutes Final setting time = 30 minutes Use– It is used when concrete is to be laid under water or in running water.

Explanations:

Quick setting cement– The quantity of gypsum is reduced and small percentage aluminium sulphate is added, it is ground much finer than ordinary portland cement. Properties– Initial setting time = 5 minutes Final setting time = 30 minutes Use– It is used when concrete is to be laid under water or in running water.