Q871
Which substance is used to retard the setting action of cement?
A.
CaO
B.
Al2O3
C.
CaSO4.2H2O
AnswerD.
Na2O + K2O
Answer: Option C
Solution
Answer: Option C
Solution:
CaSO4.2H2O (Gypsum) is added to cement clinker to retard setting action of cement.