| 摘要: |
| 采用ASTM法测试了不同阴极NaCl溶液浓度（质量分数，下同）条件下的混凝土6h电通量，分析了氯盐浓度对混凝土中氯离子渗透系数的影响规律并探讨了其中的作用机理.结果发现：氯盐浓度对氯离子渗透系数的影响存在峰值，在一定浓度范围内可用上凸型二次多项式来表示；对混凝土耐久性破坏最严重的危险氯盐浓度范围为40%～60%；当氯盐浓度大于90%时，混凝土中的氯离子渗透系数反而保持在较低水平. |
| 关键词: 氯离子渗透 浓度改变 二次多项式 危险浓度范围 |
| DOI：103969/j.issn1007 9629201604020 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51578539）；北京市自然科学基金资助项目（8164061）；中央高校基本科研业务费专项资金（2015QL06，2010YL06） |
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| Influence of Chloride Concentration on Chloride Ion Penetration in Concrete |
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ZHU Hongguang1, YI Cheng1, SUN Fuyan2, XIONG Yun1, WU Kaibo1, WANG Que1
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1.School of Mechanics and Civil Engineering, China University of Mining & TechnologyBeijing, Beijing 100083, China;2.Huaneng Coal Industry Co., Ltd., Beijing 100070, China
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| Abstract: |
| The service life of concrete was significantly dependant on chloride concentration in external environment. The electric flux of concretes in 6 hours at different NaCl solution concentration conditions was tested by ASTM method, and the influence of chloride concentration on chloride ion penetration coefficient for concrete was investigated. The results show that, a peak exists in the relation between chloride concentration and chloride ion penetration coefficient, which can be expressed in a form of quadratic polynomial. Danger range（about 40% to 60%, by mass） for chloride concentration will damage concrete durability mostly. The chloride ion penetration coefficient varies little with chloride concentration over 90%. |
| Key words: chloride ion penetration variation of concentration quadratic polynomial danger range for concentration |
