Electro-mechanical impedance (EMI) is among the many types of gauges that can be used for structural health monitoring (SHM) of concrete structures. The bond strength between concrete and planted rebar plays an important role in the integrity of concrete structures strengthened by post-installed anchors. This paper presents a method to monitor the development of epoxy bond strength between concrete and a planted rebar by the EMI technique. Three concrete cubes each with a planted rebar were fabricated and used for a set of monitoring experiments. To conduct experiments, a lead zirconate titanate (PZT) patch was attached to the polished side surface of the planted rebar. During the monitoring test, conductance spectra signals from three PZT patches were acquired at the 0th, 20th, 40th, 60th, 80th, 100th, and 120th min of the experiment. Furthermore, a pull-out test was conducted on two concrete beams with three planted rebars each. The root mean square deviation (RMSD) and mean absolute percentage deviation (MAPD) were applied to compare instantaneous conductance signatures with the initial, baseline conductance signature across different frequency ranges to ascertain the growth of bond strength during the curing process of epoxy. The results of the monitoring experiments and the pull-out test demonstrate the effectiveness of EMI technique in monitoring bond strength development between concrete and planted rebars. The results also show potential application prospects of the EMI technique in the SHM of reinforced concrete structures.

机电阻抗（EMI）是可用于混凝土结构的结构健康监测（SHM）的多种量规之一。混凝土和种植钢筋之间的粘结强度在后安装锚固件加固的混凝土结构的完整性中起着重要作用。本文提出了一种通过EMI技术监测混凝土和种植钢筋之间环氧粘合强度发展的方法。制作了三个混凝土立方体，每个立方体均带有植入的钢筋，并用于一组监视实验。为了进行实验，将锆钛酸铅（PZT）贴片粘贴到种植钢筋的抛光侧表面上。在监视测试期间，在实验的第0、20、40、60、80、100和120分钟分别采集了三个PZT贴片的电导谱信号。此外，在两根混凝土梁上分别进行了拉拔试验，每根混凝土梁上都装有三个钢筋。均方根偏差（RMSD）和平均绝对百分比偏差（MAPD）用于比较瞬时电导特征与不同频率范围内的初始基线电导特征，以确定在环氧树脂固化过程中结合强度的增长。监测实验和拉拔试验的结果证明了EMI技术在监测混凝土与种植钢筋之间粘结强度发展方面的有效性。结果还显示了EMI技术在钢筋混凝土结构SHM中的潜在应用前景。均方根偏差（RMSD）和平均绝对百分比偏差（MAPD）用于比较瞬时电导特征与不同频率范围内的初始基线电导特征，以确定在环氧树脂固化过程中结合强度的增长。监测实验和拉拔试验的结果证明了EMI技术在监测混凝土与种植钢筋之间粘结强度发展方面的有效性。结果还显示了EMI技术在钢筋混凝土结构SHM中的潜在应用前景。均方根偏差（RMSD）和平均绝对百分比偏差（MAPD）用于比较瞬时电导特征与不同频率范围内的初始基线电导特征，以确定在环氧树脂固化过程中结合强度的增长。监测实验和拉拔试验的结果证明了EMI技术在监测混凝土与种植钢筋之间粘结强度发展方面的有效性。结果还显示了EMI技术在钢筋混凝土结构SHM中的潜在应用前景。监测实验和拉拔试验的结果证明了EMI技术在监测混凝土与种植钢筋之间粘结强度发展方面的有效性。结果还显示了EMI技术在钢筋混凝土结构SHM中的潜在应用前景。监测实验和拉拔试验的结果证明了EMI技术在监测混凝土与种植钢筋之间粘结强度发展方面的有效性。结果还显示了EMI技术在钢筋混凝土结构SHM中的潜在应用前景。