埋入式混凝土用Ag/AgCl工作电极制备与性能表征  

Preparation and Porformance Characterization of Ag/AgCl Working Electrode for Buried Concrete

作　　者：王鹏刚[1,2] 郭腾飞 赵铁军 李振垒[3] 万小梅 WANG Penggang;GUO Tengfei;ZHAO Tiejun;LI Zhenlei;WAN Xiaomei(School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao 266033, China;Qingdao Tengyuan Design Institute Co., Ltd., Qingdao 266100, China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]山东省高校蓝色经济区工程建设与安全协同创新中心,山东青岛266033 [3]青岛腾远设计事务所有限公司,山东青岛266100

出　　处：《建筑材料学报》2020年第3期611-617,共7页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51608286,51878365);山东省自然科学基金重大基础研究项目(ZR2017ZC0737);青岛市应用基础研究计划项目(17-1-1-13-jch)。

摘　　要：为了及时、准确地监测海洋环境下混凝土结构中的氯离子侵蚀过程和钢筋周围的氯离子浓度,基于电化学工作原理,制备了一种精度高、性能稳定的可埋入式固态Ag/AgCl工作电极.结果表明:粉压法制备的Ag/AgCl工作电极耐碱性好、响应时间短、稳定性和重现性均较好,电极电位与氯离子浓度的对数呈线性关系,符合Nernst方程;当工作温度为10~40℃时,温度对传感器电位值的影响可以忽略,当工作温度超过40℃时,传感器电位值要进行温度修正;干扰离子对电极电位没有影响;当7<pH≤10时,电极电位几乎不变,当10<pH≤13时,电极电位随pH值的增加而增大.使用Ag/AgCl工作电极测试混凝土中的氯离子浓度时,必须同时测试混凝土内部的温度和pH值,并作相应的修正.Ag/AgCl工作电极可以为混凝土中氯离子含量的原位动态监测提供技术支持.In order to monitor the whole process of chloride penetration into concrete and get the chloride concentration at the position of rebar timely and accurately,a solid-state chloride sensor which could be embedded in concrete with high sensitivity and stable performance was developed based on the theory of electrochemistry.The results show that Ag/AgCl electrode prepared by pressed powder method has good alkali resistance,short response time,stable performance and good reproducibility.The potential of the electrode is in linear relation with the logarithm of chloride concentration,conforming to Nernst equation.When the temperature is operated at 1040℃,the influence of temperature on the potential value of the sensor can be neglected.But,when the temperature is above 40℃,the temperature influences the potential value of the sensor a lot.A temperature correction coefficient is needed.When 7<pH≤10,the pH value has almost no effect on the potential value of Ag/AgCl electrode,and when 10<pH≤13,the potential value of Ag/AgCl electrode increases with the increase of pH value.So,if this type of Ag/AgCl electrode is used as working electrode of chloride sensor,temperature and pH value of concrete at the location of chloride sensor are also needed at the same time.Together with Reference electrode,Ag/AgCl working electrode provides technical support for in situ dynamic monitoring of chloride concentration in concrete.

关 键 词：压片法 工作电极 性能表征 影响因素 

分 类 号：TU528.01[建筑科学—建筑技术科学]