How does calcium chloride help concrete set in moderately cold weather?

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Cement The cement-making process, from crushing and grinding of raw materials, through roasting of the ground and mixed ingredients, to final cooling and storing of the finished product.

In moderately cold weather, concrete strength can be adversely affected by low temperatures. To compensate for this, calcium chloride is added to the mixture as an accelerating agent.1

This additive works by speeding up the setting process of the cement. As the concrete sets more rapidly, it generates sufficient internal heat to counteract the effects of the moderately low ambient temperatures, helping to ensure the material hardens properly.1