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Why Gypsum is added after calcination in the manufacture of Portland cement?

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in Engineering Chemistry I by (506k points)
Why Gypsum is added after calcination in the manufacture of Portland cement?

(a) To prevent flash setting

(b) To improve the quality of cement

(c) To increase the lime saturation factor

(d) None of the mentioned

I have been asked this question in my homework.

Question is from Construction Material Cement topic in portion Materials and their Properties of Engineering Chemistry I

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Right answer is (a) To prevent flash setting

For explanation I would say: Gypsum is added after calcination to prevent the flash setting and it acts as a retarder.

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