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研究了对氯盐污染混凝土进行电化学除盐时钢筋表面发生的析氢反应及其对钢筋-混凝土间粘结力的影响。结果表明,电化学除盐时钢筋表面会发生析氢反应;氢气的生成量和钢筋-混凝土间粘结力的降低受电化学除盐过程的电流密度、通电时间等参数的影响。在混凝土中开适量小孔至钢筋表面引导氢气的排出可以降低粘结力的损失。由此可见,电化学除盐中钢筋表面电化学反应生成的氢气所产生的膨胀压力是导致钢筋-混凝土间粘结力下降的重要原因之一。
The hydrogen evolution reaction on the surface of steel bar and its effect on the bond between rebar and concrete during electrochemical desalination of chloride-contaminated concrete were studied. The results show that the hydrogen evolution reaction occurs on the surface of steel bar during electrochemical desalting. The generation of hydrogen and the reduction of the bond strength between steel bar and concrete are affected by the current densities and energization time of electrochemical desalting process. In the concrete to open a small amount of holes to guide the hydrogen surface of the discharge of hydrogen can reduce the loss of bond strength. It can be seen that the swelling pressure generated by the hydrogen generated by the electrochemical reaction on the surface of the rebar in electrochemical desalting is one of the important reasons that lead to the decrease of the bond force between the rebar and the concrete.