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Q: The initial setting time of fresh concrete should be :
  • A. Lower than 15 minutes
  • B. Greater than 30 minutes
  • C. Greater than 1 hour
  • D. Not more than 10 hours
Correct Answer: Option B - The time available for mixing the cement and placing it in position is an initial setting time of cement. After which the cement mixture losses it's plasticity. The initial setting time of OPC should not be less than 30 min. sand final setting time should not be more than 600 min (10 hr.)
B. The time available for mixing the cement and placing it in position is an initial setting time of cement. After which the cement mixture losses it's plasticity. The initial setting time of OPC should not be less than 30 min. sand final setting time should not be more than 600 min (10 hr.)

Explanations:

The time available for mixing the cement and placing it in position is an initial setting time of cement. After which the cement mixture losses it's plasticity. The initial setting time of OPC should not be less than 30 min. sand final setting time should not be more than 600 min (10 hr.)