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Q: The compound first to settle in cement is
  • A. tricalcium aluminate
  • B. dicalcium silicate
  • C. tricalcium silicate
  • D. tetra calcium alumino-ferrite
Correct Answer: Option A - The compound C₃A is characteristically fast reacting with water and may lead to an immediate stiffening of paste and this process is termed as flash set. Hence, initial setting time and high heat of hydration of cement depends most on C₃A.
A. The compound C₃A is characteristically fast reacting with water and may lead to an immediate stiffening of paste and this process is termed as flash set. Hence, initial setting time and high heat of hydration of cement depends most on C₃A.

Explanations:

The compound C₃A is characteristically fast reacting with water and may lead to an immediate stiffening of paste and this process is termed as flash set. Hence, initial setting time and high heat of hydration of cement depends most on C₃A.