First slide

Alkaline earth metals

Question

By adding gypsum to cement

Moderate

A

setting time of cement becomes less
B

setting time of cement increases
C

colour of cement becomes light
D

shining surface is obtained

Solution

Raw materials for cement-limestone, clay, gypsum. Cement is a diny greyish heavy powder containing calcium
aluminates and silicates.
Gypsum (CaSO₄.5H₂O) is added to the components to increase the setting time of cement so that it gets sufficiently hardened. Setting of cement is an exothermic process and involves hydration of calcium aluminates and silicates.

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