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Question
Gypsum is added to cement clinker to
Options:
A .  Increase the tensile strength of cement
B .  Decrease the rate of setting of cement
C .  Facilitate the formation of colloidal gel
D .  Bind the particles of calcium silicate
Answer: Option A
During cement manufacturing process upon cooling of clinker a small amount of gypsum is added during the final grinding process. Gypsum controls the setting of the cement and if not added the cement will set immediately leaving no time for concrete placing.

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