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Setting time of cement increases by adding ____________

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Setting time of cement increases by adding ____________

(a) Gypsum

(b) CaCl2

(c) NaOH

(d) Hydrogen peroxide

I got this question in unit test.

This key question is from Accelerators and Retarders in division Admixtures and Construction Chemicals of Concrete Technology

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The correct option is (a) Gypsum

The best I can explain: Gypsum is often added to cement and concrete to slow down the drying time. Cement dries quickly. If not added, the cement will set immediately after mixing of water leaving no time for concrete placing.

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