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  

Impact of different factors on distribution of residual chlorion in concrete after electrochemical dechlorination treatment

作　　者：张琨[1,2] 单炜[1] 孙文博[3] 张桂欣[4] ZHANG Kun SHAN Wei SUN Wenbo ZHANG Guixin(Northeast Forestry University, Harbin 150006, China Heilongjiang College of Construction, Harbin 150025, China Harbin Institute of Technology, Harbin 150001, China Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China)

机构地区：[1]东北林业大学,黑龙江哈尔滨150006 [2]黑龙江建筑职业技术学院,黑龙江哈尔滨150025 [3]哈尔滨工业大学,黑龙江哈尔滨150001 [4]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《自然灾害学报》2017年第3期106-112,共7页Journal of Natural Disasters

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)~~

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。The paper studies the influence law of different factors including mineral admixtures, applied voltage and electrolyte solution on the distribution of the residual chlorion in the concrete after the electrochemical deehlorina- tion treatment. A 14-day electrochemical dechlorination treatment was carried out on a cylindrical concrete speci- mens with different proportioning by using 20 - 60 V stabilized power supply, two different electrolyte solutions and titanium metal mesh anode on different parts of the specimens. The results show that the amount of the residual chlorion decreases from the outer layer to the inner layer by a factor of 300% - 450% and the gap becomes larger with the increase of the voltage. On equal conditions, the dechlorination effectiveness of Na3BO3 solution is better than that of saturated Ca（OH） 2 solution, but both have no obvious effects on the distribution of the residual chlori- on. The addition of silicon ash and slag improves the compactness of concrete and also leads to the increase of the content of residual chlorion.

关 键 词：电化学除氯 混凝土 矿物掺合料 电解质溶液 离子分布 

分 类 号：TU502[建筑科学—建筑技术科学]