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 - On the Road with Dave Gohl: Tractors and Farming - by Dave Gohl. I never thought I'd live to see the day, when I could call myself a farmer. What allows me to say this? Well, when our family moved to our 20 acre site near New Prague, Minnesota, I had one thought in mind. You guessed it, farm it somehow. A little history is in order. In my younger days, mom, dad and my brother made frequent visits to dad's youngest brother Pete, who took over the home farm from grandpa MIke. It was the typical set-up, milk cows, pigs & chickens. In the winter, we'd play
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