Posted by paul on November 21, 2016 at 12:43:51 from (76.77.197.114):
In Reply to: Concrete Question posted by pburchett on November 21, 2016 at 11:08:15:
A whole lot of concrete trucks running here now, last minute jobs. The high is in the mid 30s for the past week now, low is touching the teens.
Here is my understanding:
Concrete when it cures is a chemical process, the water doesn't just dry out of it but it is like a fire, some chemical reactions are going on slowly.
This chemical reaction creates some heat, so concrete pour at 25 degrees or so isn't such a bad thing. It will warm itself above freezing. As long as you have something, a frame or a concrete blanket over it to keep the heat from wicking away fast over night. The surface could freeze up if totally exposed and chip up.
However, after a week or so, the chemical process slows down and less heat is generated, but there may still be a fair amount of unconverted water left in your concrete. -That- is when it can freeze and hurt your concrete? This is when you really need to protect it from bitter cold for a few weeks.
At the temperatures you mention, there is no worry about any issues.
But what wil you have in a week, or three weeks from now? Same temps and you should be fine, but if the temp dips down to 10 degrees or so, you could have issues?
The antifreeze in the water in the concrete is a miserable deal, I would avoid that if I could.
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