Damage fracture characterization of pervious asphalt considering temperature effect based on acoustic emission parameters

Pervious asphalt (PA) is an effective pavement material to alleviate surface runoff and hot island effect in city. Acoustic emission (AE) monitoring can realize the damage characterization of materials to avoid their premature failure. The purpose of this study is to demonstrate the damage fracture process of PA under compression and splitting using AE parameters. Firstly, PA specimens were prepared by Marshall compaction method and AE testing were conducted for specimens under compression and splitting. Corresponding AE signals were recorded and interpreted to obtain the parameters including signal amplitude, duration, count, signal energy and rise time. Secondly, the evolutions of AE parameters, cumulative AE parameters and load versus time were obtained and analyzed to characterize the fracture processes of specimens under compression and splitting. Finally, temperature effects on damage fracture of PA were considered and demonstrated. The results revealed that AE parameters could realize the classification of different damage stages for PA specimens under compression and splitting. AE energy presented the most favorable ability for damage fracture characterization in both compression and splitting tests. Cumulative AE parameters exhibited generally satisfactory discriminating results except for some demarcation points. Changes in mechanical performances of PA specimens caused by temperature effect could be clearly identified through AE parameters. It can be concluded that AE possesses great potential for damage fracture characterization of PA material.