UPSC CAPF AC 2023 Paper

Question : 12 of 120

Marks: +1, -0

Which one of the following statements is not correct regarding the setting of cement?

The addition of a small percentage of gypsum (CaSO₄) lengthens the setting period of cement.
According to the colloidal theory, gels of hydrated silicates are formed and when these gels harden, the set cement gains strength.
Tricalcium silicate is responsible for initial setting of cement.
Dicalcium silicate and tricalcium silicate are responsible for the final strength which occurs in about a year.

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