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Calcium Chloride in Concrete

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Have I fallen from the train?

I have never allowed Calcium Chloride in any of my concrete.

But contractors and concrete suppliers in this area (we sometimes have some
low temperatures), will use it without even asking.

Has concrete chemistry changed so that calcium chloride is no longer
harmful to concrete and/or rebar?

Fountain E. Conner, P.E.
Gulf Breeze, Fl. 32561