Gypsum used in cement manufacturing acts as a/an-
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A.
Plasticizer
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B.
Air entraining agent
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C.
Retarder
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D.
Accelerator
Correct Answer:
C. Retarder
Explanation:
Gypsum is added during the final grinding stage of cement production to serve as a retarder. Its primary function is to regulate the hydration process of tricalcium aluminate, which prevents the cement from undergoing a flash set or hardening too quickly. By slowing down the initial setting time, gypsum ensures the mixture remains plastic and workable for a sufficient period, allowing for proper mixing, transportation, and placement in construction projects.
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