Yan Zheng;Qianjin Mao;Yali Wang;Ziming Wang;Suping Cui;
<正>Currently,with concrete durability problems becoming increasingly outstanding the premature breakage of concrete buildings-induced by inadequate durability is extremely serious which brings huge economic losses to our society.The application of protective coating is an effective measure to improve the durability of concrete.Water-borne protective coatings are eco-friendly and consequently it will become the development direction of concrete protective coating in the future.This paper takes water-borne fluorocarbon coating as the main research object.Water-based silicone acrylic emulsion coating and water-based fluorocarbon resin coating were chose as prime and topcoat respectively.The impact of the coating's thickness and viscosity on the durability of concrete and the relationship between the viscosity of the coating and its penetration depth were testified by chloride ion permeability-resistance property of concrete.The paper also research the protection performance of the protective coating system in Xenon lamp weathering condition.The research has the role of guiding designing coating system. The results show that thickness is proportional to the protective performance of the coating,and the penetration depth highly depends on viscosity.And the result of coating-4 viscosity method shows that samples with viscosity between 15 and 25 seconds have better chloride permeability resistance.Viscosity does not affect the coating closure performance. The main influence of coating sealing is thickness.With the increasing of coating thickness,the resistance of concrete to chloride ion penetration was increased with a certain scope.When the thickness get up to 280μm,the resistance of concrete to chloride ion penetration will not change in continue to increase the thickness. Water-borne fluorocarbon coating system is achieved by painting primer and topcoat twice respectively,then the coating thickness is 300μm and the chloride ion penetrating depth is 0.067.The best coating thickness is between 280μm and 350μm.The results show that the optical water protection coating system has a good protection performance in the sunlight aging environment. Originality This paper takes water-borne fluorocarbon coating as the main research object. Research the influence of coating system process and penetrability of coating in the concrete surface on the performance of the concrete protective properties.The research has the role of guiding designing coating system.By testing the bibulous rate of concrete and the resistance of concrete to chloride ion penetration,we selected a water protection coating system composed of water-borne silicone acrylic emulsion primer and water-borne fluorocarbon topcoat. In this paper,there is an important part.It is the weather resistance and protective action and mechanism of fluorocarbon coating system.This section contains testing in the environment of sunlight aging,acid rain erosion and circulation variable temperature.By researching the weather resistance and protective action and mechanism of fluorocarbon coating system,the results show that fluorocarbon coating system which the paper selected has good protection performance in the sunlight aging environment.
protective coating;;concrete durability;;fluorocarbon coating;;coating restoration
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