Which substance is used to retard the setting action of cement?
A. CaO
B. Al2O3
C. CaSO4.2H2O
D. Na2O + K2O
Answer: Option C
Solution(By Examveda Team)
CaSO4.2H2O (Gypsum) is added to cement clinker to retard setting action of cement.This Question Belongs to General Knowledge >> Chemistry
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