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Cracks in concrete

Crack:

Temperature cracks, shrinkage cracks and cracks in the external force
A reason:

① before the final setting of concrete by external force.

② concrete slurry leakage excessive water loss.

③ the same structure of poured concrete dry thin inconsistent.

④ steel and concrete "thermal" bloat inconsistent.

B prevention:

① intensive care pressure wiping concrete.

② prohibit vibration after the concrete has set.

③ control of concrete consistency dilute dry, good "pay", "holding" measures.

C recommends:

leveling the roof insulation (commonly known as the hammer hit the roof or roof),

according to the conventional 20% reduction in the amount of choice of cement.