Calcium chloride Calcium chloride is a chemical admixture sometimes used to speed the early setting and strength development of concrete. Its use depends on the project's specifications and reinforcement requirements.
Although calcium chloride can accelerate curing in cold conditions, it is generally avoided in reinforced concrete because it may contribute to corrosion of embedded steel. Alternative non-chloride accelerators are often selected where reinforcement is present. Contractors should always follow the approved mix design for the specific application.
Frequently Asked Questions About Calcium chloride
What is calcium chloride used for in concrete?
It is an accelerating admixture that speeds early setting and strength development, mainly in cold conditions.
Why is it avoided in reinforced concrete?
Chlorides can promote corrosion of embedded steel, which eventually cracks and spalls the concrete from within.
What is used instead?
Non-chloride accelerators, which provide similar early strength gain without the corrosion risk to reinforcement.
Who decides whether it can be used?
The approved mix design for the specific application governs, not general practice.