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Once the concrete is wet, it will begin to cure. It must be kept moist while it cures, and this can be accomplished by slowing the evaporation of the water that was mixed into it. Usually, this is done by covering the concrete with plastic sheeting or by spraying it lightly with water as it cures. Concrete will shrink and expand with temperature, so large slabs must be fitted with expansion joints. These are most commonly seen as the gaps in roadways and sidewalks, but they are also built into walls and other structures as well.

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Q: Why are gaps or spaces left between cemented block and iron rod instead of laying them so that each side touches?
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