Calcium Chloride Concrete Additive

But many specifications prohibit its use.

Calcium chloride concrete additive.

Sakrete cement mix accelerator is a calcium chloride based product designed to accelerate the set time of concrete mortar or any laporte cement based product. Calcium chloride was used as an accelerating admixture in concrete up until the mid 1970s. When ready mixed concrete is used calcium chloride should be added at the plant site if the concrete is to be discharged within one hour after the start of mixing. But its use may be limited by building codes or prohibited by some specifications.

In the hydrate form it contains about 25 by weight of water of crystallisation. Aci318 08 building code requirements for structural concrete with some exceptions allows calcium chloride as an accelerating admixture for cast in place concrete. The beneficial effects of calcium chloride will be even more pronounced at lower temperatures. This is unfortunate because calcium chloride is the most efficient and least expensive accelerator used in concrete.

Otherwise it should be added at the job site mixing for at least three minutes or 30 revolutions of the mixer whichever is longer. Calcium chloride is the most effective and least expensive cold weather accelerator for concrete. The accelerated cure rate measured as final concrete set time can be reduced by two thirds when two per cent calcium chloride is added two hours compared to six hours for plain concrete morris chemicals s e r t s calcium chloride can accelerate cement hydration reducing its set time. If dry calcium chloride is used it should be.