Study on the influence of design parameters of porous asphalt pavement on drainage performance

Abstract

To investigate the design factors influencing the drainage performance of porous asphalt pavement and its performance degradation, a three-dimensional infiltration model of porous asphalt pavement was established. The influence of permeability coefficient, drainage layer thickness, drainage path length, and pavement cross slope for drainage performance was analyzed. The drainage performance was evaluated with the multiple influence factors, and the drainage performance degradation was explored with the porosity decay. The results showed that the design parameters including permeability coefficient, drainage layer thickness, drainage path length, and pavement cross slope exhibit strong correlations with pavement drainage performance, with correlations greater than 0.6. The increase in the permeability coefficient, drainage layer thickness, pavement cross slope, and the reduction in drainage path length are all benefits to improved drainage performance. It is effective to enhance drainage performance by increasing the permeability coefficient combined with a higher pavement cross slope in high drainage requirement areas. The porosity decay caused by road load and porosity reduction leads to a 20%-45% degradation in drainage performance. Therefore, during the road surface design process, it is necessary to comprehensively consider the synergistic effects of design parameters, while also evaluating both the initial and residual drainage performance with the combined influence of load and dust.