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研究了矿物掺合料、施加电压、电解质溶液等因素对混凝土试件在电化学除氯处理后残留氯离子分布的影响规律。试验采用20~60 V稳压电源、两种不同电解质溶液和钛金属网阳极对不同配合比混凝土试件进行了连续14 d的电化学除氯处理,并在试件不同部位取样测试其残余氯离子含量。结果表明:经过电化学除氯处理,混凝土试件中沿着钢筋界面向混凝土外缘方向的氯离子含量逐渐递增,外层残余氯离子浓度约为内层浓度的3至4.5倍;除氯电压越大,则混凝土中内外层氯离子含量的差距越大;相同条件下,Na_3BO_3溶液的除氯效果优于饱和石灰水溶液,但两者对除氯后试件中氯离子的分布并无明显影响;由于掺硅灰和矿渣提高了混凝土的密实度,导致除氯后混凝土中残留氯离子含量有所增加。
The effects of mineral admixtures, applied voltage and electrolyte solution on the residual chloride distribution in concrete specimens after electrochemical dechlorination were studied. In the experiment, 20-60 V regulated power supply, two different electrolyte solutions and titanium mesh anode were used to conduct electrochemical dechlorination treatment on concrete specimens with different proportions for 14 days. Samples of different parts of the specimens were tested for residual chlorine Ion content. The results show that after the electrochemical dechlorination treatment, the content of chloride ions in concrete specimens gradually increases along the reinforcement interface toward the concrete outer edge, and the residual chloride ion concentration in the outer layer is about 3 to 4.5 times that of the inner layer. The chlorine removal voltage The greater the difference is, the greater the difference of chloride ion content between the inner and outer layers of concrete is. Under the same conditions, the dechlorination effect of Na_3BO_3 solution is better than that of saturated lime solution, but the distribution of chloride ion in the sample after dechlorination has no obvious effect ; Due to silica fume and slag increased the density of concrete, resulting in residual chlorine chloride content after the concrete has increased.