交变荷载作用下损伤混凝土中氯离子传输行为  

Chloride Transport Behavior of Damaged Concrete under Alternating Load

作　　者：关博文[1] 杨涛[2] 吴佳育[1] 徐安花 盛燕萍[1] 陈华鑫[1] GUAN Bowen;YANG Tao;WU Jiayu;XU Anhua;SHENG Yanping;CHEN Huaxin(School of Materials Science and Engineering,Chang an University,Xi an 710061,China;School of Transportation,Southeast University,Nanjing 210096,China;Qinghai Research Institute of Transportation,Xining 810008,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710061 [2]东南大学交通学院,江苏南京210096 [3]青海省交通科学研究院,青海西宁810008

出　　处：《建筑材料学报》2018年第2期304-308,共5页Journal of Building Materials

基　　金：国家重点研发计划资助项目(2017YFB0309903);青海省自然科学基金资助项目(2017-ZJ-764;2017-ZJ-763);江西省交通科技项目(2015H0037);中央高校基本科研业务费专项资金资助项目(310831172201;310831171001)

摘　　要：根据氯离子在混凝土中的传输机制,从交变荷载作用下混凝土的疲劳损伤入手,基于裂纹面积来表征氯离子扩散系数,从微观角度定量分析了疲劳损伤对混凝土裂纹面积扩展值的影响;根据Fick第二定律建立了交变荷载作用下损伤混凝土中的氯离子传输模型,并给出了其解析解.结果表明:所建模型计算结果与室内试验结果吻合良好,说明交变荷载作用下损伤混凝土中氯离子传输模型所应用的理论和提出的假设具有一定的合理性和科学性.According to the transport mechanism of chloride ion in concrete,the fatigue damage of concrete under alternating load was discussed.The chloride diffusion coefficient was related to the area of cracks.The effect of fatigue damage on crack area expansion value of concrete was quantitatively analyzed from the microscopic point.Based on Fick s second law,chloride ion transport model of damaged concrete under alternating load was established.The calculated results were compared with the test values of indoor experiment.The results show that the calculated results from the proposed model are in good agreement with the test values.The applied theory and the proposed hypothesis of chloride ion transport model for damaged concrete under alternating load are reasonable.

关 键 词：道路工程 水泥混凝土 交变荷载 氯离子侵蚀 传输行为 

分 类 号：TU528.01[建筑科学—建筑技术科学]