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Gypsum reacts with ____________ to form calcium sulfo aluminates and calcium sulfo ferrite.

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Gypsum reacts with ____________ to form calcium sulfo aluminates and calcium sulfo ferrite.

(a) C4AF

(b) CF4

(c) SO3

(d) CaO

I have been asked this question in a national level competition.

The doubt is from Chemical Composition Test in chapter Types of Cement and Testing of Cement of Concrete Technology

1 Answer

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Right option is (a) C4AF

To explain: C4AF work as flux material and also it accelerates the hydration of silicates. C4AF hydrates to tricalcium aluminate hydrate and calcium ferrite CaO.Fe2O3 in amorphous form.

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