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Properties and Uses of Calcium Oxide

The initial s...

Question

The initial setting time of cement depends most on

A

tri-calcium aluminate

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B

tri-calcium silicate

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C

tri-calcium alumino-ferrite

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D

di-calcium silicate

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Solution

The correct option is A tri-calcium aluminate
The compound $C_{3} A$ is characteristically fast reacting with water and may lead to an immediate stiffening of paste, and this process is termed as flash set. Hence, initial setting time of cement depends most on $C_{3} A$ .

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