Study of In-Service Asphalt Pavement High-Temperature Deformation Based on Accelerated Pavement Test

This paper explores high temperature deformation regularity of asphalt pavement/asphalt mixture test specimen under different conditions: in-service asphalt pavement, 10 cm milled and overlaid asphalt course with and without vibration rolling, normal overlaid asphalt pavement section, based on full-scale accelerated pavement testing equipment MLS66 and lab repeat wheel rolling test. The research findings reveal that asphalt pavements under different conditions show similar high temperature deformation regularity apparently in three-stage deformation. The degree of compaction and the age have significant impact on high temperature deformation performance of asphalt pavement. Based on the number of accumulation loading applied to the pavement and rutting depth, preliminary conversion relationship between accelerated loading actions and actual standard loading actions is drawn from the perspective of resistance to deformation. The concept of deformation stability is introduced to indicate the high-temperature deformation resistance of asphalt pavement and the high-temperature APT deformation stability results could be converted to the lab test deformation stability results with a conversion coefficient of 1.2–2.8.