为了抑制氯离子反向扩散造成钢筋二次腐蚀,进一步延长修复后混凝土结构的服役寿命,在电化学除氯(ECR)基础上提出一种通过电驱动SiO32-进入孔隙,与孔隙中的Ca(OH)2反应生成C-S-H凝胶硬化混凝土/砂浆,并同时去除混凝土/砂浆内氯离子的新型的联合修复方法.由对比试验,通过滴定氯离子,利用自腐蚀电位(Ecorr)、腐蚀电流密度(Icorr)和电化学阻抗谱法(EIS)研究了该方法的修复效果及其修复后的长期耐久性,此外,由压汞法和热重分析探讨了该方法的微观作用机制.结果表明:联合修复方法与电化学除氯具有相近的除氯效率;与电化学除氯相比,联合修复方法能更有效延缓钢筋的二次腐蚀;随着初始氯离子含量的减少,联合修复方法延缓钢筋二次腐蚀的效果更为显著;联合修复方法对钢筋二次腐蚀的抑制源于其致密化作用,经联合修复后砂浆总孔隙率与有害孔数量相比于修复前均有所下降.
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