pouring concrete

Old 12-08-01, 12:40 PM
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Question pouring concrete

I live in an area where temperatures fluctuate a lot during the winter. This can allow outdoor projects, provided the timing is right. My question is how long does it take concrete to set and how low can the temperature go before it is finished or Are there any tricks I can use to assist the setting/curing time?
Old 12-13-01, 06:18 AM
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In general you shouldn't try to pour below 40 degrees, if there is a possibility it will freeze. Concrete should cure for at least 24 hours before it has the strength to withstand a freeze. It needs to cure wet for around 7 days before it has gained sufficient strength for "use" (i.e. framing). Calcium can be added to the mix when it's near freezing but it takes special consideration when pouring and finishing, something better addressed by a concrete professional.
Old 12-22-01, 02:43 AM
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Location: Volusia County, Florida (Central)
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Generally, concrete must reach 500 psi before subject to freezing temperatures. (below 40).

your options are:

use type II High early cement which will reach 500psi in 12 hours.

use regular cement which will reach 500psi in 24 hours.

If you want to pour and are afraid of freezing, ask your local cement guy to add calcium in the mix.

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