Post-installed anchor technology is widely used for structural strengthening and for retrofitting existing constructions. The old–new concrete interface associated with using this technology is of great significance in the shear capacity of concrete structural member under shear forces. For such members, interface failures usually occur with bond slip. In this paper, an application of a piezoceramic enabled active sensing technique is put forward to monitor Old - New concrete interfacial bond slip. Three concrete specimens (S1, S2, and S3) are fabricated and each specimen consists of two parts. Each part is made of concrete poured at different times, and both are bonded with an anchored rebar embedded inside the specimen. Two PZT aggregates bonded to opposing sides of the concrete specimen helped to realize active sensing. During the shear loading test, both the load values and the signals from sensors are acquired every 20 s. The test durations of S1, S2 and S3 lasted 960, 1,120, and 1,110 s, respectively. Furthermore, the received signal energies are quantified through wavelet packet analysis to monitor the Old - New concrete interfacial bond slip process. The experimental results show that the change of WPEI in the received signals has a direct relation with the severity of the Old - New concrete interfacial bond slip. Moreover, the PZT-based active sensing approach is feasible to monitor the shear-induced bond slip in Old - New concrete interfaces.

后安装锚固技术广泛用于结构加固和改造现有建筑。与使用该技术相关的新旧混凝土界面对混凝土结构构件在剪切力下的抗剪能力具有重要意义。对于这样的成员，界面失效通常发生在粘结滑移中。在本文中，提出了一种应用压电陶瓷使能的主动传感技术来监测旧-新混凝土界面粘结滑移。制作了三个混凝土试件（S1、S2 和 S3），每个试件由两部分组成。每个部分都由在不同时间浇筑的混凝土制成，并且两者都与嵌入在试样中的锚固钢筋结合。两个 PZT 骨料粘合在混凝土试样的相对两侧，有助于实现主动传感。在剪切载荷测试期间，每 20 秒采集一次载荷值和来自传感器的信号。S1、S2 和 S3 的测试持续时间分别为 960、1,120 和 1,110 秒。此外，接收到的信号能量通过小波包分析进行量化，以监测旧-新混凝土界面粘结滑移过程。实验结果表明，接收信号中WPEI的变化与新旧混凝土界面粘结滑移的严重程度有直接关系。此外，基于 PZT 的主动传感方法可用于监测旧 - 新混凝土界面中剪切引起的粘结滑移。接收到的信号能量通过小波包分析量化，以监测旧-新混凝土界面粘结滑移过程。实验结果表明，接收信号中WPEI的变化与新旧混凝土界面粘结滑移的严重程度有直接关系。此外，基于 PZT 的主动传感方法可用于监测旧 - 新混凝土界面中剪切引起的粘结滑移。接收到的信号能量通过小波包分析量化，以监测旧-新混凝土界面粘结滑移过程。实验结果表明，接收信号中WPEI的变化与新旧混凝土界面粘结滑移的严重程度有直接关系。此外，基于 PZT 的主动传感方法可用于监测旧 - 新混凝土界面中剪切引起的粘结滑移。