干湿循环与荷载耦合条件下氯离子侵入混凝土的试验研究  

Experimental Investigation of Chloride Ingress into Concrete under the Coupling Effects of Drying-wetting Cycles and Load

作　　者：刘静静 陈在铁[1] 耿犟[2] LIU Jingjing;CHEN Zaitie;GENG Jiang(Department of Architectural Engineering,Shazhou Professional Institute of Technology,Zhangjiagang 215600,China;Department of Civil Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]沙洲职业工学院建筑工程系,江苏张家港215600 [2]常州大学土木工程系,江苏常州213164

出　　处：《连云港职业技术学院学报》2022年第3期10-14,共5页Journal of Lianyungang Technical College

基　　金：江苏省青蓝工程资助项目(苏教师函[2020]42号)。

摘　　要：氯离子侵蚀是海洋环境下钢筋混凝土结构劣化的主要原因之一,特别是潮汐区和浪溅区。在不同干湿比和压应力比条件下,进行了氯离子侵入混凝土的试验研究,分析讨论了干湿比、压应力比及暴露时间对混凝土氯离子含量的影响。通过实验数据分析发现,氯离子含量随混凝土结构标高的增加呈现先增大后减小再急剧增大的规律,确定了对混凝土结构最不利干湿比以及氯离子含量峰值对应的混凝土结构相对标高。结果表明,不同干湿循环条件下,氯离子含量最大值出现在结构相对标高0.83处,对应的最不利干湿循环比为5:1。干湿循环与持压荷载耦合条件下,氯离子含量最大值相对位置可能会上移,出现在海洋环境的浪溅区中。Chloride-induced erosion is one of the main reasons for the deterioration of reinforced concrete(RC)structures in Marine environment,especially in tidal and splash zones.In this paper,the chloride transport in concrete under the different conditions of drying-wetting ratios and compressive stress ratios is studied.The influence of drying-wetting ratios,compressive stress ratios and exposure time on chloride content is analyzed and discussed.Through the analysis of experimental data,it is found that the chloride content first increases,then decreases,and then increases sharply with the increase of concrete structure elevation.And the most unfavorable drying-wetting ratios and the relative elevation of RC corresponding to the peak value of the chloride concentration are determined.The results indicate that the maximum chloride content appears at the relative elevation of 0.83,and the corresponding most unfavorable drying-wetting ratio is 5:1.Under the coupling condition of the drying-wetting cycles and sustained pressure load,the relative position of the maximum chloride content may move upward and appear in the splash zone.

关 键 词：氯离子 干湿循环 荷载 混凝土 

分 类 号：TU528[建筑科学—建筑技术科学]