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Which of the following is the quickest to react with water when the water is added to the cement?

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Which of the following is the quickest to react with water when the water is added to the cement?

(a) Tetra-calcium alumino-ferrite

(b) Tricalcium silicate

(c) Dicalcium silicate

(d) Tricalcium aluminate

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My question comes from Plain and Reinforced topic in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials

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The correct choice is (d) Tricalcium aluminate

The explanation is: Tricalcium aluminate is the quickest to react with water when the water is added to the cement. In the order of decreasing rate are tetra-calcium alumino-ferrite, tricalcium silicate and dicalcium silicate.

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