Study of the Durability of a Fully Permeable Asphalt Pavement Structure Based on the Accelerated Pavement Test Method under Saturated Conditions

Abstract

As a highly safe and environment-friendly pavement, fully permeable asphalt pavement has become a research hotspot around the world. At present, there is a lack of research on the durability of all of the pervious asphalt pavements in China. In view of the aforementioned research status, in this study, a test road was paved based on the research results of the structure and materials of fully permeable asphalt pavement. For the first time, the accelerated pavement test method was used in the saturated state to study the damage effect on fully permeable asphalt pavement in the most unfavorable environment and actual traffic load state. The saturated state used in this study refers to the simulated extreme rainfall environment, namely 360±10 mm/day. In addition, the durability of the asphalt pavement with different structures was studied according to the pavement surface rutting, deflection, subgrade settlement, water permeability, and other indexes for different test instances. Through 150,000 instances of saturated accelerated pavement testing, we determined that the bearing capacity of porous cement concrete pavement was better than that of porous cement–stabilized macadam. Different disposal materials and different depths of the subgrade had a large influence on the settlement of the fully permeable asphalt pavement subgrade. The use of a gravel cushion could improve the overall durability of the fully permeable asphalt pavement, and the entire line between the soil base and the base needed to be paved with antifilter geotextile to prevent the anti-infiltration of the subgrade soil. PVC pipes with prefabricated holes were laid in the inner part of the subbase. This was beneficial to speeding up the permeability of water and reducing the influence of water retention on the stability of the pavement. In a conclusion, Structures A and D with better pavement durability could be recommended for the pavement of mixed road surfaces and parking lots. Structures B and C could be recommended for the pavement of sidewalks, squares, and the inner roads of a community. The research results proposed in this paper have feasibility and a certain engineering guiding significance.