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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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