Abstract

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Author(s):: ZHOU Wei; HUANG Xiao-ming; LIANG Yan-long; SHANG Bo; 1. School of Transportation, Southeast University, Nanjing 210096, Jiangsu, China; 2. Xi’an Highway Maintenance Technology Institute, Xi’an 710075, Shaanxi, China

Keywords:: road engineering; porous asphalt pavement; permeability coefficient; dust clogging; prediction model

Abstract:: In order to analyze the permeability performance decay law of porous asphalt pavement, a dust clogging test was conducted on an instrument which was developed to analyze the permeability of porous asphalt mixtures based on the actual accumulation process and particle size distribution of dust in the porous asphalt pavement. The decay laws of permeability coefficient of porous asphalt mixtures with different porosities were obtained from the test. According to the dust distribution and its flow law, and voids structure decay law, the permeability decay prediction model of porous asphalt pavement was established. The results show that the residual rate of permeability coefficient has a linear relationship with the quality of blocking particles. The decay rate of permeability coefficient is proportional to the initial porosity. For the actual porous asphalt pavement, the decay law of permeability coefficient is related to the filtration coefficient, dust accumulation rate, service time and the distance from the road center line. Especially, the drainage performance reduces rapidly in wheel track and outside lane.