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Q: In the context of setting time test for cement, what does "initial setting time" refer to?
  • A. The time when the cement paste begins to lose its plasticity
  • B. The time when the cement paste reaches its maximum strength
  • C. The time when the cement paste becomes hard and can no longer be molded
  • D. The time when the cement paste achieves its final set
Correct Answer: Option A - The cement initial setting time indicates when the cement pasts starts to lose its plasticity. For instance, if the initial setting time of cement is 30 minutes, the cement mortar or concrete must be placed in the desired position within 30 minutes of adding water.
A. The cement initial setting time indicates when the cement pasts starts to lose its plasticity. For instance, if the initial setting time of cement is 30 minutes, the cement mortar or concrete must be placed in the desired position within 30 minutes of adding water.

Explanations:

The cement initial setting time indicates when the cement pasts starts to lose its plasticity. For instance, if the initial setting time of cement is 30 minutes, the cement mortar or concrete must be placed in the desired position within 30 minutes of adding water.