双向电渗对钢筋混凝土修复效果的试验研究——保护层阻锈剂、氯离子和总碱度的变化规律

发布时间：2019-03-19 16:14

【摘要】：为提高氯盐侵蚀环境下钢筋混凝土结构的无损修复效果,对受氯盐侵蚀的钢筋混凝土试件采用双向电渗技术,在排出氯离子的同时向混凝土保护层内引入阻锈剂.为考察该技术的修复效果,采用有机元素分析法和自动电位滴定法,结合电流密度、通电时间、水灰比、初始氯盐掺量4个影响因素,研究混凝土保护层内阻锈剂、氯离子分布的变化情况,并对保护层的总碱度进行测量;同时设置电化学除氯组作为对照.结果表明:双向电渗处理后试件保护层内氯离子含量降低,总碱度提高;通过对各参数的合理控制,阻锈剂迁移至钢筋表面的浓度足以起到较好的阻锈效果.双向电渗的效果随电流密度、通电时间、试件水灰比的增加而提高,而受初始氯盐掺量的影响较小.双向电渗在对混凝土氯离子迁出和总碱度提高的效果方面与电化学除氯有所差异.
[Abstract]:In order to improve the non-destructive repair effect of reinforced concrete structure under the environment of chloride salt erosion, the two-way electroosmosis technology was used to remove chloride ions and introduce rust inhibitor into the concrete protective layer while chloride salt-eroded reinforced concrete specimens were subjected to two-way electroosmosis. In order to investigate the repairing effect of the technology, the corrosion inhibitor in the concrete protective layer was studied by organic element analysis and automatic potentiometric titration, combined with four influencing factors, such as current density, power-on time, water-cement ratio, initial chloride content, and so on. The variation of chloride ion distribution and the measurement of the total basicity of the protective layer; At the same time, the group of electrochemical chlorine removal was set as the control. The results show that the chloride ion content in the protective layer of the specimen decreases and the total basicity increases after two-way electroosmosis treatment, and the concentration of rust inhibitor migrating to the steel bar surface is enough to play a good anti-rust effect through reasonable control of each parameter. The effect of two-way electroosmosis is increased with the increase of current density, power-on time and water-cement ratio of the sample, but it is less affected by the initial amount of chlorine salt. The effect of bi-directional electroosmosis on the removal of chloride ions and the increase of total alkalinity of concrete is different from that of electrochemical dechlorination.
【作者单位】：浙江大学宁波理工学院;浙江大学结构工程研究所;
【分类号】：TU375

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