Why does gypsum slow down the setting of the cement ?

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Solution

Gypsum itself is a dihydrated Calcium suplhate (CaSO_4.2H₂O) which increases the water content in cement making it soft and slow down the setting time.

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Q. Which one of the following slows down or retards the setting action of cement

By adding gypsum to cement
(a) setting time of cement becomes less
(b) setting time of cement increases
(c) colour of cement becomes light
(d) shining surface is obtained

Why gypsum is added in the manufacturing process of cement?

Q. Assertion :Gypsum is added to powdered clinkers to get cement. Reason: Addition of gypsum to clinker decreases its setting time and thus cement hardens readily on mixing with water.

Q. Addition of gypsum to cement:

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Why does gypsum slow down the setting of the cement ?

Gypsum itself is a dihydrated Calcium suplhate (CaSO4.2H2O) which increases the water content in cement making it soft and slow down the setting time.

Gypsum itself is a dihydrated Calcium suplhate (CaSO_4.2H₂O) which increases the water content in cement making it soft and slow down the setting time.