不同因素对电化学除氯处理后混凝土残留氯离子分布的影响

发布时间：2018-11-16 18:54

【摘要】：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。
[Abstract]:The effects of mineral admixtures, applied voltage and electrolyte solution on the distribution of residual chloride ions in concrete specimens after electrochemical dechlorination were studied. Two different electrolyte solutions and titanium metal mesh anode were used to treat concrete specimens with different mix ratios for 14 days. The residual chlorine ion content was measured at different parts of the specimens. The results show that the chloride ion content along the interface of reinforcing bar to the outer edge of concrete increases gradually after electrochemical chlorine removal, and the residual chlorine ion concentration in the outer layer is about 3 to 4.5 times of that in the inner layer. Under the same conditions, the chlorine removal effect of Na_3BO_3 solution is better than that of saturated lime water solution, but both of them have no obvious effect on the distribution of chloride ions in the samples after dechlorination. Because the density of concrete is increased by adding silica fume and slag, the residual chlorine ion content in concrete increases after chlorine removal.
【作者单位】：东北林业大学;黑龙江建筑职业技术学院;哈尔滨工业大学;中国地震局工程力学研究所;
【基金】：国家科技支撑计划课题(2015BAK17B06) 中国地震局创新团队发展计划资助(中国大陆地区地震灾害模拟与评估)~~
【分类号】：TU528

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