锈蚀钢筋混凝土梁的新型除氯-加固方法研究  

Study on A New Method of Chloride Extraction-strengthening for Corroded Reinforced Concrete Beams

作　　者：李悦[1] 刘江林 陈喜旺 王晓中 林辉 周永祥 Li Yue;Liu Jianglin;Chen Xiwang;Wang Xiaozhong;Lin Hui;Zhou Yongxiang(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124;Beijing Construction Engineering New Building Materials Co.Ltd.,Beijing 100015;Beijing Kenaikete New Materials Co.Ltd.,Beijing 100039)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]北京建工新型建材有限责任公司,北京100015 [3]北京可耐可特新材料有限公司,北京100039

出　　处：《江西建材》2022年第11期18-20,共3页Jiangxi Building Materials

基　　金：北京市自然科学基金(8202005);国家自然科学基金项目(51678011)。

摘　　要：电化学除氯(ECE)可有效去除混凝土中的氯离子,降低钢筋的锈蚀风险。文中采用磷酸镁水泥(MPC)粘结CFRP作为ECE阳极,实现混凝土结构的除氯-加固一体化。主要研究了内掺氯盐的钢筋混凝土梁在不同ECE电流密度下除氯28d后的除氯效率和抗弯承载力。结果显示:与对照组相比,ECE电流密度为1A/m2和3A/m2时,除氯后混凝土梁抗弯极限荷载分别提升了7.99%和3.49%。钢筋-混凝土界面的除氯效率高达70%以上。Electrochemical chloride extraction(ECE) can effectively remove chloride ions from concrete and reduce the corrosion risk of rebar.This paper innovatively uses magnesium phosphate cement(MPC) bonded CFRP as ECE anode to achieve the integration of chloride removal and strengthening of concrete structures. The efficiency of chloride extraction and bending behavior of reinforced concrete beams doped with chlorine salt after 28 days of chloride behavior under different ECE current densities are studied. The results showed that, compared with the control group, the ultimate bending behavior of concrete beams after chloride removal increased by 7.99% and 3.49% respectively when the ECE current density was 1A/m2 and 3A/m2. The chlorine removal efficiency of the rebar-concrete interface is more than 70%.

关 键 词：钢筋混凝土梁 电化学除氯 加固 抗弯性能 除氯效率 

分 类 号：TU375[建筑科学—结构工程]