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Q: Identify the component content which has to be reduced at the time of clinker grinding in the preparation of Quick setting cement.
  • A. Alumina
  • B. Sulphure
  • C. Gypsum
  • D. Magnesia
Correct Answer: Option C - Gypsum is added to retards setting time of cement. It is usually mixed with clinker at the time of final grinding. Gypsum added to clinker should not be greater than 2.5-3%. During preparation of quick setting cement the quantity of gypsum is reduced, along with addition of small amount of aluminium sulphate.
C. Gypsum is added to retards setting time of cement. It is usually mixed with clinker at the time of final grinding. Gypsum added to clinker should not be greater than 2.5-3%. During preparation of quick setting cement the quantity of gypsum is reduced, along with addition of small amount of aluminium sulphate.

Explanations:

Gypsum is added to retards setting time of cement. It is usually mixed with clinker at the time of final grinding. Gypsum added to clinker should not be greater than 2.5-3%. During preparation of quick setting cement the quantity of gypsum is reduced, along with addition of small amount of aluminium sulphate.