Both plastic shrinkage and settlement cracking occur in concrete before it has hardened. Plastic shrinkage cracking occurs because the evaporation rate at the surface of the concrete exceeds the rate of bleeding. Plastic settlement cracking occurs when the mixture settles at a different rate than the rebar or aggregates in a mixture. This will cause cracks to form on the surface of the concrete over these elements. Both of these types of cracks are explained and methods are given on how to avoid them.
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