Which of the following compounds of cement sets at the slowest rate?

Dicalcium silicate

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Tricalcium silicate

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Tricalcium aluminate

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Tetracalcium alumininoferrit

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Solution

The correct option is A Dicalcium silicate
Dicalcium silicate $2 C a O . S i O_{2}$ contains more $S i O_{2}$ as compared to tricalcium silicate $3 C a O . S i O_{2} .$ Therefore it has slow setting rate.

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