Question

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

• A. Gypsum
• B. Calcium chloride
• C. Calcium carbonate
• D. Calcium aluminate

Answer 1

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 $\left(CaC{l}_2\right)N{a}_{2}S{O}_4,NaOH$ etc.

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