碳化混凝土电化学再碱化效果研究  

Study on Effectiveness of Electrochemical Realkalization for Carbonated Concrete

作　　者：蒋正武[1] 杨凯飞[1] 潘微旺 

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海201804 [2]中铁二十三局集团轨道交通工程有限公司,上海201300

出　　处：《建筑材料学报》2012年第1期17-21,共5页Journal of Building Materials

基　　金：国家重点基础研究发展计划项目(2011CB013800);国家自然科学基金资助项目(51078269);"十二五"国家科技支撑计划项目(2011BAE14B06);光华同济土木学院基金资助项目

摘　　要：设计了碳化混凝土的电化学再碱化试验方法,提出了合理的电化学再碱化效果评价指标:pH值与钠离子迁移量.研究了电解质溶液种类及浓度、再碱化时间等对碳化混凝土电化学再碱化效果的影响.结果表明:随再碱化时间的增长,碳化混凝土内部的pH值增大,但pH值增长速率逐渐减缓.对于相同种类电解质溶液,随着其浓度升高,再碱化后碳化混凝土中的钠离子迁移量增大;对于同浓度不同种类的电解质溶液,再碱化后碳化混凝土中的钠离子迁移量不同.An experimental method of electrochemical realkalization for carbonated concrete was designed and two reasonable evaluation indexes for its effectiveness, pH value and migration content of sodium ion, were proposed. Further, effects of types and concentration of electrolyte solution, realkalization time on the effectiveness of electrochemical realkalization for carbonated concrete were investigated. The results show that the pH value increases but increase rate of pH value slows down with the increase of realkaliza- tion time. For the same electrolyte solution, the higher the electrolyte solution concentration, the higher the migration content of sodium ion in carbonated concrete after realkalization is. For the same concentra- tion of different types of electrolyte solution, the migration contents of sodium ion in carbonated concrete after realkalization are different.

关 键 词：碳化 再碱化 电解质 效果 

分 类 号：TU528.0[建筑科学—建筑技术科学]