Posted by Billy NY on November 21, 2016 at 12:05:55 from (74.76.4.60):
In Reply to: Concrete Question posted by pburchett on November 21, 2016 at 11:08:15:
Speak to your supplier and ask about the cold weather ad mixture. They'll know if you need it or not, and likely you won't. With this temperature range, it's very likely you won't have any freezing. As concrete hydrates (cures) it will create heat, but with a slab it will be less than something substantially larger like a pier or footing or similar. You don't want the concrete to freeze during that initial cure, once it's hydrated, at lower temperatures, you'll get a slower cure (28 days it takes to reach its design strength). In hot weather, you'll always see on highway or road jobs like bridges, the use of burlap and soaker hoses to keep it from hydrating rapidly. I prefer cooler temperatures for concrete work as you don't have to worry about that.
Placing the concrete early in the day (7:00 A.M.) is ideal under these conditions, it will be setting up and going through the hydration process as the day time temperature rises. You should be able to get to the finishing part at an ideal time as well if you start early. I've had pours that were done in similar conditions, one of which they were on the power trowels after midnight. Had the subcontractor placed the concrete early in the day, it would have been a lot sooner, the colder temperatures just delayed being able to finish.
If you are still concerned, see if you can get thermal blankets and cover the slab after finishing. Might be overkill for these temperatures, but given you are just around freezing, using thermal blankets would insure nothing freezes.
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