JEE Main · 2023 · 06 Apr 2023 · Shift 1 · s-Block Elements

The setting time of Cement is increased by adding

(A)Clay
(B)Silica
(C)Limestone
(D)Gypsum✓ Correct

Answer: (D)

Solution

A small amount of gypsum,

CaS O_{4} \cdot 2 H_{2} O

, is ground with cement clinker to act as a retarder. It slows the hydration of the aluminate phase and prevents flash setting, thereby increasing the setting time of cement.

JEE Main · 2023 · 06 Apr 2023 · Shift 1 · Single correct option

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