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

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%.