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Calcium Chloride in Concrete[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Calcium Chloride in Concrete
- From: Roger Turk <73527.1356(--nospam--at)COMPUSERVE.COM>
- Date: Wed, 6 Jan 1999 17:00:21 -0500
No, Fountain, you haven't fallen from the train. Calcium chloride is an accelerant and is used in very cold climates to have the concrete set up quickly. I don't believe that you would have a need for it in Florida just as we don't have a need for it in southern Arizona. There are enough accelerating admixtures available that are calcium chloride free so that there is little need to use calcium chloride. Calcium chloride is doubly bad if there is any aluminum embedded in the concrete, such as aluminum electric conduit. (Aluminum and concrete is bad enough without adding calcium chloride to it!) A proprietary liquid admixture promoted as providing water proof concrete has calcium chloride as its primary active ingredient and caused serious damage to an underground parking garage in Phoenix a number of years ago. This product is also used by masons to accelerate the setting of mortar. Stick by your guns, Fountain, and keep calcium chloride out of the concrete. A. Roger Turk, P.E.(Structural) Tucson, Arizona Fountain Conner wrote, . > 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 . >
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