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Concrete construction is the most prone to cellular problems?

the reason:

1, the thickness of each pouring concrete is too thick so that the vibration is not real or leakage vibration;

2, the template has a gap to the loss of cement slurry;

3, reinforced concrete and slump of concrete is too small, the base column and the wall of the root of the lower steps after pouring did not stop to continue to pour the concrete layer, resulting in the upper concrete root mortar from the lower part of the emission, resulting in honeycomb.