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What effect does calcium sulphate have on cement?

(a) Retards setting action

(b) Acts as flux

(c) Imparts colour

(d) Reduces strength

The question was asked during an interview.

Query is from Ingredients of Cement topic in division Materials for Construction of Basic Civil Engineering

1 Answer

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Correct answer is (a) Retards setting action

Explanation: Calcium sulphate is found in cement in the form of gypsum.  Its slows down the setting time of cement.

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