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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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