寒区高速公路混凝土护栏防腐涂层抗氯离子性能仿真研究  

Simulation Study on Chlorine Ion Resistance of Anti-Corrosion Coatings of Highway Concrete Guardrails in Frigid Areas

作　　者：刘泽 LIU Ze(Tianjin New Asia Pacific Engineering Construction Supervision Co.,Ltd.,Tianjin 300251,China)

机构地区：[1]天津新亚太工程建设监理有限公司,天津300251

出　　处：《材料保护》2022年第6期34-40,47,共8页Materials Protection

基　　金：河北省交通运输厅专项课题资助。

摘　　要：在我国北方的冬季,大量氯盐融雪剂的使用使得高速公路混凝土护栏的耐久性问题日益严重。针对高速公路混凝土护栏融雪剂环境下的耐久性问题,以氯离子扩散模型为理论基础,借助COMSOL软件,建立了高速公路桥梁混凝土护栏涂层抗氯离子侵蚀性能仿真模型。结果表明:混凝土涂层可大幅降低护栏内的氯离子浓度,对护栏耐久性的提升起到了促进作用;随着涂层厚度的增加,氯离子浓度大幅减小,减小的趋势逐渐变缓;随着涂层扩散系数的降低,氯离子浓度大幅减小。取不同扩散系数的氯化聚氯乙烯涂层(CPVC)、氯化聚乙烯涂层(CPE)、氯丁乳液涂层(CR)、氯偏乳液涂层(PVDC),与无涂层护栏进行对比,氯离子浓度至少减少了98%,28%,75%,90%。在此环境下氯化聚氯乙烯涂层(CPVC)的效果更好。研究结果可为实际工程施工提供指导。In the winter of North China, the use of a large amount of chlorine salt snow-melting agent makes the durability problem of highway concrete guardrail increasingly serious. Aiming at this problme, a simulation model of chloride ion corrosion resistance of concrete guardrail coating of highway bridge was established by COMSOL software using the chloride ion diffusion model as the theoretical basis. Results showed that the coating could significantly reduce the chloride ion concentration in the guardrail and thus improve its durability. As the coating thickness increased, chloride ion concentration decreased sharply first, and the decrease tendency gradually slowed down. With the decline of coating diffusion coefficients, the chloride ion concentration decreased significantly. Compared with the guardrail without coating, the ones applied with chlorinated polyvinyl chloride(CPVC) coating, chlorinated polyethylene(CPE) coating, chloroprene rubber latex(CR) coating and polyvinylidene chloride latex(PVDC) coating, which had different diffusion coeficients, realized a reduction of chloride ion concentration of at least 98%, 28%, 75% and 90%, respectively. Under the as-mentioned environment, CPVC coating possessed a better effect than other coatings. The research results could provide guidance for the actual construction projects.

关 键 词：氯离子浓度 有限元分析 防渗涂层 扩散系数 混凝土护栏 

分 类 号：TG172[金属学及工艺—金属表面处理]