采用等效结构参数的混凝土试块弹性模量监测  

Monitoring for Elastic Modulus of Concrete Based on Equivalent Structural Parameters

作　　者：郭智刚[1] 孙智[2] 

机构地区：[1]上海应用技术学院轨道交通学院,上海201418 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《华侨大学学报（自然科学版）》2015年第1期74-79,共6页Journal of Huaqiao University(Natural Science)

基　　金：铁道部科技研究开发计划项目(2012G003-E);上海市科技启明星跟踪项目(09QH1402300);同济大学土木工程防灾国家重点实验室自主研究课题资助项目(SLDRCE09-B-15)

摘　　要：基于压电阻抗技术,对混凝土试块弹性模量在固化过程中的发展进行监测实验研究.用阻抗分析仪测得粘贴在不同配合比的混凝土试块的压电陶瓷片在不同龄期下的电导纳信号,对28d龄期内不同配合比的混凝土试块进行弹性模量测试.采用共振频率和等效结构参数来评价混凝土固化过程中的变化.通过回归分析建立等效结构参数与混凝土试块弹性模量之间的关系,监测混凝土弹性模量发展.结果表明:压电阻抗技术可用来监测混凝土弹性模量在固化过程中的变化.An experimental study to monitoring elastic modulus of concrete during curing process was presented based on piezoelectric impedance method.The piezoceramic （PZT）patch was attached on the concrete specimen to collect the mo-nitoring signal.The electro-mechanical admittance spectra of surface bonded PZT patch were collected using an impedance analyzer by sweeping the frequency.Meanwhile,the elastic modulus of concrete was tested during curing process.The resonant frequency and equivalent structural parameters were conducted for evaluating the change of elastic modulus in concrete during curing process.A regression analysis was conducted to establish the empirical relationship between the relative elastic modulus gain of concrete and equivalent structural parameters.The established empirical formula is used for concrete elastic modulus monitoring via EMI spectra.The results tell that the piezoelectric impedance technique is a practical and reliable nondestructive test method for concrete elastic modulus gain monitoring.

关 键 词：压电阻抗 压电陶瓷 弹性模量 等效结构参数 曲线拟合 

分 类 号：TU323.1[建筑科学—结构工程]