| Summary: | The use of wireless sensors to monitor concealed damage to asphalt pavement has become an important research topic. The main obstacle to wireless sensor applications is the protection of sustainable power supplies. For this study, the self-powered damage-detection aggregate (SPA) was fabricated by encapsulating the piezoelectric vibrator with epoxy resin, prepared by compositing the piezoelectric ceramics (PZT) and polyvinylidene fluoride. The optimal PZT content in the piezoelectric vibrator was recommended as 60% according to the test results. The sensing and driving characteristics, sensitivity, and mechanical strength of the SPAs were studied, and the best SPA is recommended. The compressive strength of the SPA was 16 MPa at a temperature of 160 °C, which is far greater than the average tire pressure of 0.5 MPa to 1.3 MPa on pavement. During laboratory testing, a voltage of 75.0 V and an energy of 4.31 μJ was harvested when an SPA was embedded in an asphalt mixture slab. The coefficient of the acoustic wave attenuation, obtained from the SPA, decreased as the crack width in an asphalt pavement increased. We proved that the application of acoustic waves excited by the SPA to monitor concealed cracks of asphalt pavement is feasible. Keywords: Asphalt pavement, Concealed damage, PZT, Sensor, Acoustic wave, Intelligent monitoring
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