The setting time of cement is lowered by adding __________.

Oxides of aluminium

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Gypsum

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Oxides of magnesium

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Silica

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Solution

The correct option is B Gypsum
Gypsum is often added to cement and concrete to slow down the setting/drying time. Cement dries quickly. If gypsum is not added, the cement will set immediately after mixing of water leaving no time for concrete placing.
However, if the excess of gypsum is added, the settling time of the cement will be lowered.

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