Gypsum is added at the time of grinding of cement clinker for the purpose of :

quick setting

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delay the setting time

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improve the strength

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improve workability

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Solution

The correct option is B delay the setting time
Ans. (b) : In Clinker 2-3% of gypsum is added. The purpose of adding gypsum is to coat the cement particles by interfering with the process of hydration of the cement particles. This retards the setting of cement. Gypsum is a non-hydraulic binder occurring naturally as a soft crystaline rock or sand.

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