Laboratorial investigation on effects of microscopic void characteristics on properties of porous asphalt mixture

• Published in: Construction & building materials 2019-07, Vol.213, p.434-446
• Main Authors: Yang, Bing, Li, Hui, Zhang, Hengji, Xie, Ning, Zhou, Haonan
• Format: Article
• Language: English
• Subjects: Analysis; CAT scans; Correlation; Diagnostic imaging; Investigations; Maximum equivalent diameter; Microscopic void characteristics; Noise control; Permeability; Porosity; Porous asphalt mixture; Properties; Tomography
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2019.04.039

•The number, area and equivalent diameter of voids in porous asphalt were explored.•Void characteristics highly correlated with properties of porous asphalt.•The maximum equivalent void diameter has most significant effect on properties.•Microscopic void characteristics could optimize properties of porous asphalt. The properties of porous asphalt mixture significantly depend on its microscopic void characteristics. This paper mainly studied the correlation between the properties of porous asphalt mixture and three types of void characteristic parameters obtained through computed tomography (CT). It was found that the microscopic void characteristic parameters presented little influence on the moisture sensitivity resistance at high temperature and cooling performance, but strong correlation with other properties such as raveling resistance, permeability, connective porosity and noise reduction. In particular, the equivalent diameter and area exhibited strong correlation with properties of asphalt mixture. Moreover, the maximum equivalent diameter of void exerted the most significant impact on the properties of asphalt mixture. The investigated results could provide useful insights for optimizing and enhancing properties of porous asphalt mixture using the microscopic void parameters.