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Term Definition

A substance, such as calcium chloride, added to a concrete mix to speed up its setting and strength development.

Accelerators fall under the category of admixtures. An accelerating admixture accelerates the strength development of concrete. Accelerators are used in cold weather to develop strength faster in order to offset freeze damage.

Strength development can also be accelerated using Type III high-early-strength portland cement, lowering the water-cement ratio by increasing the amount of cement or curing at higher temperatures.