Damage fracture characterization of pervious asphalt considering temperature effect based on acoustic emission parameters
Damage fracture characterization of pervious asphalt considering temperature effect based on acoustic emission parameters
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DOI：
10.1016/j.engfracmech.2018.10.007
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发表时间：
2019-04-01
影响因子：
5.4
通讯作者：
Liu, Shiqi
中科院分区：
文献类型：
--
作者：
Jiao, Yubo;Fu, Liuxu;Liu, Shiqi
透水沥青（PA）是缓解城市地表径流和热岛效应的有效路面材料。声发射（AE）监测可以实现材料的损伤表征，以避免其过早失效。本研究的目的是使用 AE 参数演示 PA 在压缩和劈裂下的损伤断裂过程。首先，采用马歇尔压实法制备PA试件，并对试件进行压缩和劈裂下的AE测试。记录并解释相应的AE信号以获得信号幅度、持续时间、计数、信号能量和上升时间等参数。其次，获得并分析了声发射参数、累积声发射参数和载荷随时间的变化，以表征压缩和劈裂试样的断裂过程。最后，考虑并论证了温度对 PA 损伤断裂的影响。结果表明，AE参数可以实现PA试件在压缩和劈裂作用下不同损伤阶段的分类。 AE 能量在压缩和劈裂测试中表现出最有利的损伤断裂表征能力。除一些分界点外，累积 AE 参数表现出总体令人满意的判别结果。通过 AE 参数可以清楚地识别温度效应引起的 PA 样品机械性能的变化。可以得出结论，AE 在 PA 材料损伤断裂表征方面具有巨大的潜力。
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.