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Question
Which of the following is commonly used as retarder in cement?
fuEufyf[kr esa ls dkSu lhesaV esa fjVk;Mj ds :i esa bLrseky fd;k tkrk gS\
A.
Calcium sulphate
B.
Gypsum
C.
Potassium carbide
D.
Sodium chloride
Answer ( Option B)

Gypsum

Solution

Gypsum used as retarder. A retarder is a chemical agent that slowdown chemical reaction of cement in concrete. Commonly used retarders are gypsum, borax and boric acid

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