摘要
服役于海洋环境中的混凝土常受到氯盐-硫酸盐共同侵蚀,结构表面也常处于干湿交替环境中。以24h为一个循环,研究不同干湿交替条件下受氯盐-硫酸盐侵蚀的混凝土中结合氯离子含量及结合特性,通过X射线衍射(XRD)、热重分析(TG⁃DTG)揭示结合机理。结果表明:同一腐蚀方式下,结合氯离子含量随着腐蚀时间的延长而增加。相同时间内,在腐蚀早期干湿比≤1的试件中结合氯离子浓度要大于干湿比>1的试件,腐蚀后期则相反。经过30d干湿循环后,试件中结合氯离子低于长期浸泡状态。复合溶液同时侵蚀时,采用Freundlich等温吸附曲线来描述自由氯离子与结合氯离子间的关系更合适。
Concrete used in marine environments is often eroded by chloride ion and sulfate ion.The surface of concrete structure is often in the environment of dry⁃wet cycle.The content and binding characteristics of chloride ions in concrete corroded by chloride ion and sulfate ion under different dry⁃wet conditions are studied in a 24-hour cycle.The bonding mechanism is analyzed by X ray diffraction(XRD)and thermal analysis(TG⁃DTG).The results show that:under the same corrosion mode,the content of chloride ions increases with increasing corrosion time.In the same time,the average concentration of chloride ions in the specimens with the dry⁃wet ratio≤1 in the early stage of corrosion is greater than that of the specimens with the dry⁃wet ratio of>to 1,and the opposite is observed in the later stage of corrosion.After a 30-day dry and wet cycle,the bound chloride ions in the specimens are lower than the long⁃term soaking state.The Freundlich isothermal adsorption curve is more suitable to describe the relationship between free chloride and bound chloride when the chloride ion and sulfate ion are corroded simultaneously.
作者
于丽波
储洪强
董浩
Yu Libo;Chu Hongqiang;Dong Hao(College of Air Transport and Engineering,Nanhang Jincheng College,Nanjing 211156,China;Hohai University,Nanjing 211100,China;China Design Group Co.Ltd,Nanjing 210014,China)
出处
《建筑科学》
CSCD
北大核心
2023年第5期106-113,共8页
Building Science
基金
国家自然科学基金资助(51479051)
江苏省高校自然科学基金面上项目资助(16KJB560007)。
