不同裂缝尺度下水泥净浆的交流阻抗特性研究  

AC Impedance Characteristics of Cement Paste Blocks with Crack of Different Length

作　　者：李碧雄[1,2] 陈剑[1,2] 莫思特[3] 吴瑾炎 

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]四川大学能源工程安全与灾害力学教育部重点实验室,四川成都610065 [3]四川大学电气信息学院,四川成都610065

出　　处：《建筑材料学报》2015年第4期614-618,共5页Journal of Building Materials

基　　金："十二五"国家科技支撑计划项目(2012BAK10B07);四川省应用基础计划(2014JY0186)

摘　　要：在论述交流阻抗谱法(ACIS)在水泥净浆裂缝检测中应用的可行性基础上,基于电化学原理和Randles电路,提出了描述带裂缝水泥净浆试件ACIS行为的等效电路模型.以预设不同长度裂缝的水泥净浆试件和无裂缝水泥净浆试件为研究对象,基于交流阻抗谱技术,将钢筋作为电极,测试了各组试件在变化频率的正弦波脉冲作用下的电压信号峰峰值,计算了相应的阻抗幅模量,用试验数据对等效电路模型进行了验证.研究表明,有、无预设裂缝水泥净浆试件的阻抗幅模量差异明显,基于交流阻抗谱来检测水泥净浆内部裂缝是可行的;阻抗特性值与裂缝长度之间存在量化关系.The feasibility of application of AC impedance spectroscopy（ACIS） in the detection to cement paste crack was assessed according to the previous work. The equivalent circuit model for describing ACIS properties of cement paste with crack was put forward based on Randles circuit. Using the steel as elec- trode, three groups of cement paste specimens with or without crack were tested for the peak-to-peak val- ues of voltage signal according to the AC impedance spectroscopy testing technology. The dimension of crack designed in the cement paste varied to investigate crack dimension effect on electrochemical imped- ance properties of the specimens. Impedance amplitude for each specimen was figured out, and the experi- mental data was used to validate the equivalent circuit model. Results show that impedance amplitude for specimens with or without crack is quite different; there is quantitative relation between impedance charac- teristics and crack geometry scale.

关 键 词：水泥净浆 交流阻抗谱 等效电路 裂缝 检测 

分 类 号：TU502.4[建筑科学—建筑技术科学]