Yes, it's a chemical reaction, they call it hydration and the important aspect of this is to not allow the concrete to "hydrate" too quickly, hence a "slow cure".
In this area, you will see burlap placed over the concrete after it's been finished and has hydrated enough to do so. Burlap protects the green finish and water sprinkler lines are spread out to keep the new slab wet until such time both can be removed.
A day like it is today is perfect for placing concrete, 30F this morning, no humidity and highs in the 50's to 60F today.
In hot weather, if the concrete hydrates rapidly, likely the finish will spall or just not hold up like it should. Eventually the aggregate will be exposed. Concrete has capillaries and when salt is used to de-ice in the winter, it will seep through the capillaries and react with reinforcing steel, sometimes expanding same 3x its diameter and spall the concrete around it.
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Today's Featured Article - Identifying Your Tractor - by Staff. Maybe you bought it from a friend who didn't know what kind of tractor it was, or perhaps (and this is every tractor fanatics dream) you stumbled across it in an abandoned field covered with weeds but intact. In any case, you have no idea what the make and/or model is. For awhile perhaps it doesn't really matter. Especially if it runs! But pretty soon you'll probably need to tinker with it a bit and maybe buy a part or too. Having a manual is nice. But how does one go about dete
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