Monitoring and Evaluation of Interface Delamination in Reinforce Concrete using Ultrasonic Guided Waves

摘要

In order to test the interface conditions between concrete and rebar, the propagation properties of ultrasonic guided waves (UGW) are explored. Numerical methods are employed to calculate the disperse curves. Optimal excitation signal and frequency are selected. Then UGW test installation is designed to test the prepared specimens, which include different artificial defects. Time-domain and frequency-domain analysis are employed in processing the received signals. In order to obtain more accurate correlation, energy attenuation parameter is proposed, and the linear curve was obtained. This study indicates UGW is an accurate tool in evaluating the condition of interfaces between concrete and rebar on the condition that frequency and modes are properly selected. Also promising is the UGW technology being used in non-destructive test of reinforced concrete.