To prevent flash setting of cement, which of the following is added to cement?

Fly ash

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Silica fume

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Gypsum

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Sodium oxide

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Lime

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Solution

The correct option is C Gypsum
Flash set is the stiffening of the cement paste within a few minute after mixing the compound C $_{3}$ A is fast reacting with water and may leads to a immediate stiffening of paste, the role of gypsum added during the manufacturing of cement is to prevent its fast reaction.

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To prevent flash setting of cement, which of the following is added to cement?

The correct option is C GypsumFlash set is the stiffening of the cement paste within a few minute after mixing the compound C3A is fast reacting with water and may leads to a immediate stiffening of paste, the role of gypsum added during the manufacturing of cement is to prevent its fast reaction.