I poured concrete in a barn, about a month ago. The weather has been
cool, and it took forever to dry. One corner still has water on the
surface. That corner is furthest away from any air flow. I have even
dried it with an old towel, several times, and run a large fan for
several days, but it is still "sweating". It's plenty hard, I can
walk on it, but it just seems to never dry. The slab is 4" thick.
My concern is that the weather has begun to freeze at night in the
past week. I dont think it froze inside the barn, but it soon will.
If that cement still contains water in it, (which it must), wont the
freeze cause the concrete to fail?
PS. There is only one window in the shed, and its a tin sided
building, so not much ventilation.