基于Permit法的纳固材料混凝土表层氯离子扩散性能研究  

RESEARCH ON CHLORIDE DIFFUSIVITY OF CONCRETE SURFACE SPRAYED WITH NANO SOLID MATERIAL BASED ON PERMIT METHOD

作　　者：祝小靓[1,2] 金峰 周虎[2] 胡德华[3] 段景川 ZHU Xiaoliang;JIN Feng;ZHOU Hu;HU Dehu;DUAN Jingchuan(Research Center on Hydraulic Structures, Jiangxi Hydraulic Research Institute, Nanchang 330029, China;Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China;Electric Power Construction South Construction Investment Co. Ltd, Shenzhen 518000, China)

机构地区：[1]江西省水利科学研究院水工安全工程技术研究中心,南昌330029 [2]清华大学水利水电工程系,北京100084 [3]中电建南方建设投资有限公司,广东深圳518000

出　　处：《工业建筑》2018年第3期37-40,共4页Industrial Construction

基　　金：中国博士后科学基金资助项目(2017M612154);水利部鄱阳湖水资源水生态环境研究开放基金项目(ZXKT201702);江西省水利厅科技项目(KT201606)

摘　　要：为解决混凝土纳米等级的毛细孔通道渗透问题,通过纳米微细化技术将微米级的胶体硅酸纳改性成超精细化的纳米级别的硅酸纳分子,采用Permit法对其抗渗性能的改善效果进行了测试分析。试验结果表明：外室溶液的电导率随时间增加而增加,最后趋于平稳,外室溶液的温度先随时间增加而增加,而后缓慢下降,确定了稳态时间在30 min左右;通过测定稳态阶段阳极室的氯离子浓度,得到氯离子浓度与电导率之间的线性换算关系,现场试验时通过测定溶液的电导率来换算溶液的氯离子浓度,进而计算混凝土的氯离子扩散系数;通过Permit法对现场混凝土的测试,喷涂纳固材料的混凝土氯离子扩散系数比未喷涂的平均小34.0%,证明了纳固材料对于混凝土的抗渗性能可以起到明显的改善作用。In order to solve the problem of concrete permeability caused by nano grade capillary channel,the technique of nano micro refining was used to refine colloidal sodium silicate from μm grade to nano grade,Permit method was used to test and analyze the impermeability. The test results showed that the conductivity of outer chamber solution increased with time,and finally to be stabilized,the temperature of the solution increased with time at first,and then slowed down,the steady-state time of conductivity was about 30 minutes; the chloride ion concentration at steady stage was determined to obtain the linear conversion relationship between chloride ion concentration and conductivity,the chloride ion concentration in the field experiment was converted by conductivity,and then the chloride diffusion coefficients of concrete were calculated. Through the field tests based on Permit method,it was found that compared with the untreated concrete,the average chloride ion diffusion coefficients of concrete sprayed with nano solid material were less than 34% ,it could prove that nano materials could apparently improve the impermeability of concrete.

关 键 词：Permit法 纳固材料 混凝土保护层 电导率 氯离子扩散系数 

分 类 号：TU528[建筑科学—建筑技术科学]