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引用本文:	孙丛涛,刘诗群,牛荻涛,侯保荣.干湿循环条件下钢筋锈蚀的临界氯离子浓度[J].建筑材料学报,2016,19(2):385-389

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干湿循环条件下钢筋锈蚀的临界氯离子浓度
孙丛涛¹, 刘诗群², 牛荻涛³, 侯保荣¹
1.中国科学院海洋研究所,山东青岛266071;2.青岛理工大学建筑设计研究院，山东青岛266033;3.西安建筑科技大学土木工程学院,陕西西安710055

摘要:

采用电化学交流阻抗谱研究了干湿循环条件下混凝土中钢筋锈蚀的临界氯离子浓度，深入探讨了混凝土中钢筋锈蚀临界点的判断方法，分析了干湿循环时间比对临界氯离子浓度的影响.结果表明：借助电化学交流阻抗谱法能较为准确地判断钢筋锈蚀临界点；临界氯离子浓度随干湿循环时间比的增加基本呈增大趋势；临界氯离子浓度与干燥结束时混凝土的饱和度之间存在线性关系，且随着干燥结束时混凝土饱和度的增大而降低.

关键词: 干湿循环钢筋混凝土电化学交流阻抗谱临界氯离子浓度

DOI：103969/j.issn1007 9629201602030

分类号:

基金项目:国家自然科学基金资助项目(51108442)；中国博士后基金资助项目(2012M521380)；山东省博士后创新基金资助项目(201203106)

Critical Chloride Concentration of Rebar Corrosion under Dry Wet Cycles

SUN Congtao¹, LIU Shiqun², NIU Ditao³, HOU Baorong¹

1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.Architectural Design and Research Institute, Qingdao Technological University, Qingdao 266033, China;3.College of Civil Engineering, Xian University of Architecture and Technology, Xian 710055, China

Abstract:

Electrochemical impedance spectroscopy was used to study critical chloride concentration of rebar corrosion in concrete under the condition of dry wet cycles. The method for estimating the critical state of rebar corrosion in concrete was discussed, and the effect of time ratio of drying to wetting on critical chloride concentration was analyzed. The results show that the critical corrosion state can be determined by electrochemical impedance spectroscopy. The critical chloride concentration tends to increase with the increase of time ratio of drying to wetting. The critical chloride concentration has a linear relationship with the saturability of concrete after drying, and decreases with the increase of saturability of concrete after drying.

Key words: dry wet cycle reinforced concrete electrochemical impedance spectroscopy critical chloride concentration