人工模拟海洋潮汐区应变硬化水泥基复合材料抗氯盐侵蚀性能  

Chloride Resistance of Strain Hardening Cementitious Composites under the Artificially Simulated Marine Tidal Zone

作　　者：张鹏[1] 庄智杰 鲍玖文 魏佳楠 赵铁军[1] ZHANG Peng;ZHUANG Zhijie;BAO Jiuwen;WEI Jianan;ZHAO Tiejun(School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《建筑材料学报》2021年第1期1-6,21,共7页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51922052,U1706222,51778309,51908307);山东省“双一流”建设工程土木;青岛市博士后应用研究项目(A2020-007);大连理工大学海岸和近海工程国家重点实验室开放课题基金资助项目(LP1902)。

摘　　要：通过人工模拟海洋潮汐区环境,研究了干湿循环时间比(3∶1、85.4∶1)和暴露时间(30、90d)对应变硬化水泥基复合材料(SHCC)抗氯盐侵蚀性能的影响.结合Fick第二定律,进一步分析了SHCC表面氯离子含量和扩散系数的时变规律.结果表明:干湿循环制度对SHCC氯离子侵蚀有显著影响,SHCC表面氯离子含量时变规律符合倒数模型;SHCC表观氯离子扩散系数明显高于其瞬时氯离子扩散系数,SHCC混凝土氯离子扩散系数的时间衰减系数大于C30普通混凝土.The effect of dry-wet cycle time ratio(3∶1 and 85.4∶1)and exposure time(30,90d)on chloride resistance of strain hardening cementitious composites(SHCC)was investigated through the artificially simulated marine tidal zone test.Combined with the classical Fick's second law,the time-dependent behaviors of the surface chloride content and diffusion coefficient were further analyzed.The results indicate that the mechanism of dry-wet cycles has a significant influence on the behavior of chloride ingress into concrete.The time-varying behavior of surface chloride content conforms to the variation of inverse model.The apparent chloride diffusion coefficient is markedly greater than that of instantaneous coefficient,and the age attenuation coefficient of SHCC is greater than that of C30 ordinary concrete.

关 键 词：应变硬化水泥基复合材料 海洋潮汐区 氯盐侵蚀 扩散系数 时间衰减系数 

分 类 号：TU528.1[建筑科学—建筑技术科学]