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Q: Which of the following compounds gives rapid hardening with an early gain in strength with a higher heat of hydration in OPC Cement?
  • A. C₃S
  • B. C₃A
  • C. C₂S
  • D. C₄ AF
Correct Answer: Option A - It has high lime content can be obtained by increasing the C₃S content but is normally obtained from OPC clincker by finer grinding. Tricalcium silicate (C₃S) [25-50%]– It increase the resistance to freezing and thawing. • It is responsible for early strength and hardness. • The heat of hydration is 500 J/g. Tricalcium aluminate (C₃A) [5-11%]– • It rapidly leads with water and is responsible for flash set to finely grounded clinker. • C₃A is responsible for the initial setting. • The heat of hydration of 865 J/g.
A. It has high lime content can be obtained by increasing the C₃S content but is normally obtained from OPC clincker by finer grinding. Tricalcium silicate (C₃S) [25-50%]– It increase the resistance to freezing and thawing. • It is responsible for early strength and hardness. • The heat of hydration is 500 J/g. Tricalcium aluminate (C₃A) [5-11%]– • It rapidly leads with water and is responsible for flash set to finely grounded clinker. • C₃A is responsible for the initial setting. • The heat of hydration of 865 J/g.

Explanations:

It has high lime content can be obtained by increasing the C₃S content but is normally obtained from OPC clincker by finer grinding. Tricalcium silicate (C₃S) [25-50%]– It increase the resistance to freezing and thawing. • It is responsible for early strength and hardness. • The heat of hydration is 500 J/g. Tricalcium aluminate (C₃A) [5-11%]– • It rapidly leads with water and is responsible for flash set to finely grounded clinker. • C₃A is responsible for the initial setting. • The heat of hydration of 865 J/g.