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Which compound may lead to a rapid stiffening of the paste with a large amount of the heat generation?

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Which compound may lead to a rapid stiffening of the paste with a large amount of the heat generation?

(a) C2S

(b) C3S

(c) C3A

(d) C4AF

The question was asked in my homework.

This intriguing question originated from Hydration of Cement in division Cement of Concrete Technology

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Right option is (c) C3A

The explanation is: C3A is characteristically fast reacting with water & may lead to a rapid stiffening of the paste with a large amount of the heat generation (Flash-Set)-(Quick-Set).

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