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Question

The most common admixture which is used to accelerate the initial Setting of concrete is__?

A
Gypsum
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B
Calcium chloride
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C
Calcium carbonate
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D
Calcium aluminate
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Solution

The correct option is B Calcium chloride
• Calcium chloride is an accelerator that increases the rate of hydration (accelerate the initial set)

• They decrease the setting time of cement and accelerate the setting.
e.g. Calcium Chloride (CaCl2)Na2SO4,NaOH etc.

• They are commonly used in cold weather conditions or where early removal of Formwork is required.

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