氯盐浓度与循环荷载对道路混凝土氯离子传输影响研究  

Study on the influence of chloride concentration and cyclic load on chloride ion transport in road concrete

作　　者：黄剑 李伟 於德美 付腾飞[2] HUANG Jian

机构地区：[1]中交四航局第五工程有限公司,福建福州350008 [2]福建农林大学交通与土木工程学院,福建福州350002 [3]长安大学公路学院,陕西西安710061

出　　处：《福建建设科技》2023年第1期89-91,96,共4页Fujian Construction Science & Technology

基　　金：福建省自然科学基金项目(No.2019J05051,No.2019J01407);中交四航产学合作课题(ZJSHW-FZDTLZ-2021-E3-048)。

摘　　要：氯盐及车辆动态荷载的存在使得水泥混凝土路面或桥梁等结构破坏严重。本文对道路混凝土采用氯盐溶液浸泡并同步施加动态荷载,并测试各侵蚀龄期混凝土不同深度自由氯离子含量。通过Fick第二定律解析解方程对氯离子浓度进行拟合,分析各因素对表观表面氯离子浓度Cs和表观扩散系数Dapp时变规律的影响。引入效应系数K,分析不同氯盐浓度下动态荷载对混凝土抗氯离子渗透性能的影响。结果表明,动态循环荷载作用显著加速了氯离子的扩散,氯盐溶液浓度越大,同一深度自由氯离子含量越高。且随着侵蚀龄期的延长,K不断增大,混凝土抗侵蚀能力显著降低。The existence of chloride ions,sulfate ions and vehicle dynamic loads makes the road and bridge structures corroded seriously.Immersed in Chloride solution and simultaneously applying dynamic cyclic flexural loads,the free chloride ion concentration was measured.The analytical solution equation of Fick’s second law was used to fit the chloride ion concentration.The influence of cyclic loads on apparent surface chloride concentration(Cs)and apparent diffusion coefficient(Dapp)was studied.The influence coefficient K was introduced to analyze the coupling influence on the permeability of concrete.The results show that the diffusion of chloride was accelerated by dynamic cyclic loads.The greater the concentration was,the higher the content of free chloride ion was.With the extension of the erosion age,the k increased,and the resistance of concrete decreased significantly.

关 键 词：道路混凝土 氯盐腐蚀 动态循环荷载 影响效应系数K 

分 类 号：U414[交通运输工程—道路与铁道工程]