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Influence of soiling phenomena on air-void microstructure and acoustic performance of porous asphalt pavement

机译:污染现象对多孔沥青路面空隙微结构和声学性能的影响

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摘要

Acoustical properties of porous asphalt and relationships with the structure of voids are analyzed. A special focus is put on the change of porous asphalt properties due to soiling, which is widely known as an essential problem of acoustical lifetime. Soiling mechanisms which are analyzed in artificially soiled samples with imaging techniques (thin sections and scanning electron microscopy) and their relevance to acoustical parameters are shown. Flow resistivities and sound absorption behaviour (frequencies and degree of sound absorption) are measured, structure factors and tortuosities are back-calculated with absorber models and compared according to mix design and changes due to soiling phenomena. (C) 2017 Elsevier Ltd. All rights reserved.
机译:分析了多孔沥青的声学特性及其与孔隙结构的关系。特别关注的是由于污染而引起的多孔沥青性能的变化,这是众所周知的声学寿命的基本问题。显示了用成像技术(薄切片和扫描电子显微镜)分析的人工污染样品中的污染机理及其与声学参数的相关性。测量流动阻力和吸声性能(频率和吸声程度),使用吸收器模型反算结构系数和曲折度,并根据混合料设计和因污染现象而引起的变化进行比较。 (C)2017 Elsevier Ltd.保留所有权利。

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