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Pick up the correct statement from the following.

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Pick up the correct statement from the following.

(a) Calcium fluosilicates act as a retarders

(b) CaCl2 acts as a retarders

(c) Gypsum acts as a retarders

(d) Gypsum acts as an accelerators

I had been asked this question by my college professor while I was bunking the class.

This intriguing question originated from Accelerators and Retarders in chapter Admixtures and Construction Chemicals of Concrete Technology

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The correct option is (c) Gypsum acts as a retarders

The best I can explain: Gypsum is well known retarders helps to accelerating effect of high temperature on setting properties.

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