Aiming at the problem of bubbles on the concrete surface in aluminum alloy formwork construction,this paper analyzes the formation mechanism and influencing factors of bubbles.Through field investigation and indoor test,effective control countermeasures are put forward from the aspects of formwork surface cleaning,releasing agent,vibration method and molding temperature.The research results show that the formwork surface cleaning has an important influence on the generation of concrete bubbles,and if there are concrete residues or other debris on the surface of the formwork,it will hinder the discharge of bubbles,resulting in bubbles attaching to the surface of the formwork and forming bubble holes;among various releasing agents,the water-based releasing agent has the highest lubrication degree,which can effectively reduce the generation of concrete bubbles,while the oil-based releasing agent has the lowest lubrication degree,which is easy to cause the increase of concrete bubbles;if the molding temperature is too low,it will lead to poor fluidity of concrete and difficult discharge of bubbles,and it will also affect the strength development of concrete at the same time,thus reducing the bearing capacity and crack resistance of the concrete.
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