Question

Why would you add a calcium-chloride admixture to your concrete mix? What are some of the problems associated with adding it?

Answer

Calcium chloride is added to offset harmful effects of cold weather on concrete setting time and early strength gain. Unfortunately, it can cause discoloration and, due to increased potential for corrosion, should not be used in posttensioned slabs. Nonchloride accelerators are more expensive but less corrosive.