摘要
试验设计并制备了1种适用于混凝土损伤检测的压电超声传感器,通过对测法对静态荷载作用下的混凝土进行超声检测。结果表明:压电陶瓷谐振频率112 kHz,氧化铝匹配层厚度为1.5 mm时的压电传感器具有较高的灵敏度。随着混凝土施加荷载逐渐增大,传感器接收到波形的时间变长,传播速度变慢;当混凝土试块所受到的荷载力较小时,峰值和首波幅值快速减小,加载力增加,下降幅度逐渐减小,峰值由加载前的8.432 V下降至加载力110 kN时的1.289 V,首波幅值从0.045 V减小至0.01 V,证明此时混凝土内部已经产生较大损伤。
An ultrasonic sensor for concrete damage detection was designed and prepared.The ultrasonic sensor was used to detect concrete under static load.The results show that the piezoelectric sensor has high sensitivity when the resonant frequency of piezoelectric ceramic is 112 kHz and the thickness of alumina matching layer is 1.5 mm.As the concrete load increases gradually,the waveform moves backward,and the time for the sensor to receive the waveform becomes longer and the propagation speed becomes slower.When the load force on the concrete test block is small,peak-to-peak value and first wave amplitude decrease rapidly,while the loading force increases,and the decreasing amplitude gradually decreases.The peak-to-peak value decreases from 8.432 V to 1.289 V when the loading force is 110 kN,and the first wave amplitude decreases from 0.045 V to 0.01 V,proving that at this time,large damage has occurred in the concrete.
作者
孙丹丹
曹梅
胡燕
刘鹏
杜鹏
徐东宇
SUN Dandan;CAO Mei;HU Yan;LIU Peng;DU Peng;XU Dongyu(Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials,University of Jinan,Jinan 250022,China;School of Civil Engineering,Central South University,Changsha 410075,China;School of Civil Engineering and Architecture,Linyi University,Linyi 276000,China)
出处
《混凝土》
CAS
北大核心
2023年第11期29-32,37,共5页
Concrete
基金
国家重点研发计划项目(2017YFE0120900)。
关键词
传感器
压电
混凝土
静态加载
损伤检测
piezoelectric
sensor
concrete
static loading
damage detection
