Influences of Ultraviolet Aging on the Carbonation Resistance of Concrete Treated with Nano-SiO2-modified Coatings
This work investigated the influences of ultraviolet radiation on the carbonation resistance of concrete samples treated with nano-SiO2 modified polymer coatings.Three types of organic film-forming paints, such as polyurethane, chlorinated rubber, and epoxy resin, were selected and modified through the incorporation of 0.4 wt.%, 1.2 wt.%, or 2.0 wt.% nano-SiO2 particles.Concrete specimens were then treated with the modified paints and subjected to ultraviolet radiation and accelerated carbonation experiments.Scanning electron microscopy experiments were also carried out on partial coating samples at different aging time points.Results indicated that the carbonation resistance of concrete treated with polymer coatings gradually decreases with aging.Nano-SiO2 incorporation can improve the carbonation resistance of coated concrete by increasing coating density and reducing granulation.However, the addition of excessive nano-SiO2 weakens the carbonation resistance of coated concrete.Thus, the nano-SiO2 dosage of approximately 0.4 wt.% should be applied to obtain concrete coatings with the optimal carbonation resistance.
ultraviolet aging concrete carbonation resistance polymer coatings nano-SiO2
G.Li W.J.Hu Z.A.Bai
Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China Universit School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, China
国际会议
福州
英文
701-706
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）