Calcium Chloride Concrete Additive

But many specifications prohibit its use.

Calcium chloride concrete additive.

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. Use this material when a rapid set is desired or when a quick return or access for the area is required. In the hydrate form it contains about 25 by weight of water of crystallisation. If dry calcium chloride is used it should be.

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. Otherwise it should be added at the job site mixing for at least three minutes or 30 revolutions of the mixer whichever is longer. 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.

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. But its use may be limited by building codes or prohibited by some specifications. Reduced final set time.