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Q: By adopting a proper steam curing, more than 70% of the 28 days compressive strength of concrete can be obtained in about
  • A. 3 days
  • B. 7 days
  • C. 10-2 hours
  • D. 16-24 hours
Correct Answer: Option D - The concrete members are heated by steam at 93°C either at low pressure or high pressure. In low pressure steam curing about 70% of the 28 day compressive strength of concrete can be obtained in about 16-24 hours. High pressure steam curing is usually applied to precast. Concrete members and gives 28 day compressive strength at 24 hours.
D. The concrete members are heated by steam at 93°C either at low pressure or high pressure. In low pressure steam curing about 70% of the 28 day compressive strength of concrete can be obtained in about 16-24 hours. High pressure steam curing is usually applied to precast. Concrete members and gives 28 day compressive strength at 24 hours.

Explanations:

The concrete members are heated by steam at 93°C either at low pressure or high pressure. In low pressure steam curing about 70% of the 28 day compressive strength of concrete can be obtained in about 16-24 hours. High pressure steam curing is usually applied to precast. Concrete members and gives 28 day compressive strength at 24 hours.