The reason of void between steel plate and concrete ,Inappropriate grinding and cleaning of the surface of the steel plate，The surface of concrete is wet or the humidity in the air is high
1.Inappropriate grinding and cleaning of the surface of the steel plate
solution：
1）The steel plate should be polished, rusted and cleaned with acetone
2）The treated steel plate should be constructed as soon as possible to avoid further corrosion and pollution.
2.The surface of concrete is wet or the humidity in the air is high
solution：
1）Ventilation and dehumidification
2）Avoid large-area operations of construction components attachments at the same time (such as wall plastering)
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