基于表面氯离子分布的混凝土桥梁侵蚀分析  

Erosion Analysis of Concrete Bridges Based on Surface Chloride Distribution

作　　者：毕继红[1,2] 朱秋硕 关健[1] Bi Jihong;Zhu Qiushuo;Guan Jian(School of Civil Engineering, Tianjin University, 300072, China;Key Laboratory of Coast Civil Structure Safety, Ministry of Education, Tianjin University, 300072, China)

机构地区：[1]天津大学建筑工程学院,300072 [2]滨海土木工程结构与安全教育部重点实验室(天津大学),300072

出　　处：《特种结构》2018年第2期88-93,共6页Special Structures

摘　　要：大气中的氯离子对混凝土桥梁有侵蚀作用,侵蚀程度受混凝土表面的氯离子附着量影响较大。本文首先在考虑桥体形状的基础上,使用CFX软件建立计算模型,对大气中氯离子在桥梁表面的附着行为进行分析;得出桥梁不同位置处的氯离子附着量,并分析附着量不同的原因;确定盐雾环境下氯离子侵蚀的计算参数,采用考虑了时间累积影响的优化Fick第二定律对桥体各位置进行氯离子侵蚀计算与分析;得出桥梁不同位置的氯离子侵蚀情况以及钢筋发生锈蚀的时间。为今后相关工程和研究提供有意义的借鉴。The chloride ion in the atmosphere has a erosion effect on the concrete bridge, and the degree of corrosion is greatly affected by the chloride ion concentration on the concrete surface. In this paper, based on the consideration of the shape of the bridge, the calculation model was established by using CFX software, and the adhesion behavior of chloride ions on the bridge surface in the atmosphere was analyzed. Secondly, the chloride ion attaching amount at different positions of the bridge was obtained, and the reason of the difference in the amount of chloride was analyzed. Then, the parameters of chloride erosion calculation formula in salt fog environment were determined. The process of chloride ion erosion at each position of the bridge was calculated and analyzed using the optimized Fick＇s second law which considering the time cumulative effect. Finally, the chloride ion erosion degree at different positions of the bridge and the time of corrosion damage were obtained.The results put forward some useful references for the relevant engineering and researches in the future.

关 键 词：盐雾 氯离子扩散 钢筋混凝土 桥梁 CFX 

分 类 号：U448.33[建筑科学—桥梁与隧道工程]