Re: Concrete in December

Posted by Ferd on December 10, 2012 at 11:20:41 from (50.39.120.213):

In Reply to: Concrete in December posted by G1050 on December 10, 2012 at 06:43:22:

I just looked up the weather for your area and it says 21° tonight and below freezing for the next few nights. So I'd guess your ground is frozen which eliminates any possibility of pouring a slab. Footings and stem walls you most likely can do if the excavated base isn't frozen and the weather doesn't get much colder than the high 20's. Generally it will be more likely to freeze the second or third nights than the first. If light frost, still cover the top of the forms. When concrete freezes, it turns white and is more or less a dust that you can rub off.

For floors, the first thing is to have a good base. Usually six inches of clean gravel over good firm undisturbed soil or over engineered fill. Then proof roll it - heavy load and see if the compacted gravel base yields under the loaded wheels. If it does, excavate to firm soil and fill with clean compacted gravel fill. Calcium is basically salt and will only speed set up of the concrete. The building codes here will no longer allow us to use calcium where structural rebar is used - does the same thing road salt does to vehicles. If the weather is "iffy", we use hot water and Pozzutec© as an accelerator but you concrete supplier may have other similar materials. The buildings we do are mostly commercial and industrial warehouses and manufacturing.

If it's a shop floor, I'd assume you'll be running heavy equipment on it. You'd be much happier a year or two from now if you don't hurry and cut corners at the expense of doing it right.

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