无机非金属及其复合材料
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混凝土内氯离子扩散影响因素的研究综述
杨燕1,2 , 谭康豪1,2 , 覃英宏1,2,*
1 广西大学土木建筑工程学院,南宁 530004 2 广西大学工程防灾与结构安全教育部重点实验室,南宁 530004
Review of Research on the Influencing Factors of Chloride Ion Diffusion in Concrete
YANG Yan1,2 , TAN Kanghao1,2 , QIN Yinghong1,2,*
1 School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China 2 Key Laboratory of Engineering Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China
摘要 随着建筑行业的迅速发展,钢筋混凝土结构得到了广泛应用。但钢筋混凝土结构长期处在氯盐环境中易发生钢筋腐蚀现象,从而降低结构的耐久性。因此,全面系统地认识混凝土内氯离子扩散的影响有助于解决结构氯盐侵蚀问题。氯离子在混凝土中的传输机制极其复杂,其中扩散是氯离子传输的主要机制。文章梳理了国内外近年来关于混凝土内氯离子扩散的研究进展,重点评述了混凝土内氯离子扩散的影响因素,笔者认为低水灰比、加入掺和料、适当增加保护层厚度、限制裂缝宽度等基本措施可以有效减缓钢筋腐蚀。若结构处于恶劣环境中,在采取基本措施的基础上,还需要进一步采取附加措施,主要包括添加缓蚀剂、进行表面涂层、电化学处理等。这些措施得到了一系列的理论及试验验证,为工程应用提供了可行性参考。
关键词:
钢筋混凝土
氯盐环境
扩散模型
影响因素
防锈蚀措施
结构耐久性
Abstract: With the rapid development of the construction industry, reinforced concrete structures have been widely used. However, reinforced concrete structure is prone to corrosion of steel bars in the chloride environment for a long time, thereby reducing the durability of the structure. Therefore, a comprehensive and systematic understanding of the effect of chloride ion diffusion in concrete can help solve the problem of chloride salt erosion of structures. The transmission mechanism of chloride ions in concrete is extremely complicated, and diffusion is the main mechanism of chloride ion transmission. The article summarizes the research progress on the chloride ion diffusion and reviews its influencing factors in concrete in recent years at home and abroad. It is indicate that some basic measures by decreasing water-cement ratio, adding admixtures, appro-priately increasing the thickness of the protective layer, and limiting the width of cracks can effectively slow down the corrosion of steel bars. To protect the reinforced structure in a harsh environment, these measurements must be supplementary by others such as the addition of corrosion inhibitors, surface coating, and electrochemical treatment, etc. These supplementary measurements have been verified by a series of theories and experiments, which provide a feasible reference for engineering applications.
Key words:
reinforced concrete
chloride environment
diffusion model
influencing factor
anti-corrosion measurement
structural durability
出版日期: 2021-07-10
发布日期: 2021-07-14
基金资助: 广西研究生教育创新计划资助项目(YCBZ2021022);广西高等学校高水平创新团队及卓越学者计划
作者简介: 杨燕,2018年6月毕业于广西大学,获得工学学士学位。现为广西大学土木建筑工程学院硕士研究生,在覃英宏教授的指导下进行研究。目前主要研究领域为混凝土材料耐久性。 覃英宏,广西大学土木建筑工程学院教授、博士研究生导师。2005年7月毕业于中国地质大学(武汉),2008年7月硕士毕业于中科院寒旱所冻土工程国家重点实验室,2011年6月在密歇根理工大学取得博士学位,2014年1月至2015年1月在美国劳伦斯伯克利国家实验室进行博士后研究工作。2011年7月回国后,先后入选广西高校海外百人计划、广西高层次人才E类、广西卓越学者计划项目;两次获广西科技进步二等奖(2017、2019)。主要从事冻土路基、冷路面和城市热岛方面的研究工作。近年来,以第一作者在Renewable & Sustainable Energy Reviews、Energy、Construction and Building Materials 等期刊发表SCI论文43篇,SCI他引1 377次,单篇最高他引203次。
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