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Q: Pick up the correct statement from the following.
  • A. Gypsum in cement decreases the setting time
  • B. The first compound of cement which reacts with water is C3A
  • C. Bulking of sand is less when its particles are fine
  • D. all options are correct
Correct Answer: Option B - Gypsum is added in cement to increase the initial setting time. It is retarder. • First compound to react with water is C₃A. • Bulking of sand is more if its particles are fine.
B. Gypsum is added in cement to increase the initial setting time. It is retarder. • First compound to react with water is C₃A. • Bulking of sand is more if its particles are fine.

Explanations:

Gypsum is added in cement to increase the initial setting time. It is retarder. • First compound to react with water is C₃A. • Bulking of sand is more if its particles are fine.