Debond Detection using Embedded Piezoelectric Elements in Reinforced Concrete Structures - Part I: Experiment

An investigation is performed to detect debond in reinforced concrete structures. This study utilizes built-in piezoelectric discs as sensors and actuators in a pitch-catch mode to generate sensor data, which are sensitive to debond in reinforced concrete. A comparison of sensor measurements or signal changes before and after maintenance or inspection can be correlated to debonding. Both experimental and analytical works are performed during the study. Experimental study and test data are presented in this article. The test results clearly indicate that debond between concrete and rebar and yielding in rebar can be detected with built-in piezoelectric sensors and actuators in a pitch-catch mode.