Calcium Chloride Concrete Additive

But many specifications prohibit its use.

Calcium chloride concrete additive.

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. Also used when freezing temperatures are anticipated. Reduced final set time.

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

Calcium chloride was used as an accelerating admixture in concrete up until the mid 1970s. Use this material when a rapid set is desired or when a quick return or access for the area is required. 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.