In Portland cement the compound first to set after adding water is

Tetracalcium AluminoFerrite

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Dicalcium Silicate

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Tricalcium Silicate

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Tricalcium Aluminate

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Solution

The correct option is D Tricalcium Aluminate
$C_{3} A$ has the character of reacting fast with water and may lead to an immediate stiffening of paste and this process is termed as flash set. The addition of Gypsum in the manufacture of cement is to prevent such a fast reaction.

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