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Q: Which of the following compound affects the ultimate strength of cement?
  • A. Dicalcium silicate
  • B. Tetracalcium alumino-ferrite
  • C. Tricalcium aluminate
  • D. Tricalcium silicate
Correct Answer: Option A - Dicalcium silicate (C2S) is about 25–40% (normally about 32%) of cement. It hydrates and hardens slowly and takes long time to add to the strength (after a year or more). It imparts resistance to chemical attack. The heat of hydration is 260J/g. Whereas tricalcium silicate hydrates rapidly generating high heat and develops an early hardness and strength.
A. Dicalcium silicate (C2S) is about 25–40% (normally about 32%) of cement. It hydrates and hardens slowly and takes long time to add to the strength (after a year or more). It imparts resistance to chemical attack. The heat of hydration is 260J/g. Whereas tricalcium silicate hydrates rapidly generating high heat and develops an early hardness and strength.

Explanations:

Dicalcium silicate (C2S) is about 25–40% (normally about 32%) of cement. It hydrates and hardens slowly and takes long time to add to the strength (after a year or more). It imparts resistance to chemical attack. The heat of hydration is 260J/g. Whereas tricalcium silicate hydrates rapidly generating high heat and develops an early hardness and strength.