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Calcium sulphate is present in ordinary cement in the form of __________

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in Construction & Building Materials by (190k points)
Calcium sulphate is present in ordinary cement in the form of __________

(a) Lime

(b) Alumina

(c) Gypsum

(d) Magnesia

I have been asked this question in exam.

My enquiry is from Plain and Reinforced in division Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials

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Correct answer is (c) Gypsum

To explain I would say: Various ingredients of ordinary cement are lime, alumina, calcium sulphate, iron oxide, magnesia, etc. Calcium sulphate is present in ordinary cement in the form of gypsum. The function of calcium sulphate in cement is to increase its initial setting time.

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