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清华大学学报(自然科学版)  2018, Vol. 58 Issue (2): 198-203    DOI: 10.16511/j.cnki.qhdxxb.2018.25.003
  水利水电工程 本期目录 | 过刊浏览 | 高级检索 |
基于直/交流电试验方法的水泥基材料渗透性
钱鹏, 徐千军
清华大学 水沙科学与水利水电工程国家重点实验室, 北京 100084
Chloride permeability in cement-based materials based on DC/AC methods
QIAN Peng, XU Qianjun
State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
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摘要 基于直流电通量和交流阻抗谱等2种电学测试方法,该文研究了水灰比和预处理方式对水泥基材料电学性质的影响,2种电学方法的试验结果表明:随着水灰比的增大,水泥基材料的直流电通量和交流连通孔隙电阻增大,抗氯离子渗透能力降低;饱水和饱盐2种预处理方式对直流电通量影响不大,测试得到的电通量和初始电流结果基本一致,但对交流阻抗谱试验而言,饱盐试件测得的电阻值较饱水试件低;连通孔隙电阻与电通量呈指数关系,而连通孔隙电阻与初始电阻则呈线性关系;对于饱盐预处理水泥基材料,可以结合初始电流和电通量综合评价水泥基材料的抗氯离子渗透性。
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钱鹏
徐千军
关键词 水泥基材料氯离子渗透性交流阻抗谱    
Abstract:The chloride permeability of cemented materials saturated with solutions of deionized water or 1 mol/L NaCl was measured using the rapid chloride permeability test (RCPT) and electrical impedance spectroscopy (EIS). The results show that as the water-cement ratio increases, the passed charge and the resistance of continuous conduction paths (R1) increase, indicating that a reduced anti-chloride penetration ability. The RCPT tests showed that the passed charge and temperature rise of the specimens saturated with different solutions were almost the same for a given water-cement ratio. However, the EIS tests showed that the initial currents in the NaCl saturated samples were higher than in the water saturated samples. DC/AC tests showed a strong power relation between R1 and the passed charge and a linear relationship between R1 and the passed initial current. Thus, the initial current can be used to calculate the chloride diffusion coefficient and to evaluate the permeability more accurately with the passed charge.
Key wordscement-based material    chloride permeability    electrical impedance spectroscopy
收稿日期: 2017-06-13      出版日期: 2018-02-15
ZTFLH:  TV331  
通讯作者: 徐千军,教授,E-mail:qxu@tsinghua.edu.cn     E-mail: qxu@tsinghua.edu.cn
引用本文:   
钱鹏, 徐千军. 基于直/交流电试验方法的水泥基材料渗透性[J]. 清华大学学报(自然科学版), 2018, 58(2): 198-203.
QIAN Peng, XU Qianjun. Chloride permeability in cement-based materials based on DC/AC methods. Journal of Tsinghua University(Science and Technology), 2018, 58(2): 198-203.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2018.25.003  或          http://jst.tsinghuajournals.com/CN/Y2018/V58/I2/198
  表1 水泥的化学组成
  表2 水泥物理力学性能
  表3 试件配合比
  图1 交流阻抗谱的等效电路
  图2 初始电流I 的变化规律
  图3 电通量Q 的变化规律
  图4 砂浆交流阻抗谱
  图5 混凝土交流阻抗谱
  图6 试件等效电路参数
  图7 电通量与连通孔隙电阻的相关性
  图8 初始电阻与连通孔隙电阻的相关性
  图9 试验温升的变化规律
  表4 混凝土电通量和扩散系数与氯离子渗透性
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