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Admixtures in Concrete

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Question

The most commonly used admixture to accelerate the setting time of concrete is which of the following?

A

Gypsum

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B

Calcium chloride

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C

Calcium Sulphate

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D

Silica fumes

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Solution

The correct option is B Calcium chloride
Calcium chloride is an accelerator, meaning that it accelerates the setting time of the concrete. On the other hand, gypsum and calcium sulfate are retarders and they tend to slow down the setting of concrete.

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