Analysis of rejuvenation process for effective hot-in-place recycling of asphalt pavement

Abstract

The growing cargo transportation and mobility challenge increasing deterioration and repair demand of public roads infrastructure. Consequently, the road maintenance expenses remain an actual problem in state for which are constantly looking for advanced, efficient and durable pavement repair technologies. Most of the national rods of Lithuania is constructed flexible pavement structure with asphalt surface layers. One of the advantages of asphalt pavement is the quick and easy repair and the possibility recycle existing asphalt layers on the site by restoring the performance of the pavement and improving the ride quality. However, asphalt pavement mechanical properties changes with the time because of asphalt mixture ageing process. Bitumen rejuvenation process is a relevant topic related with reclaimed asphalt pavement (RAP) and hot-in place recycling (HIR) technologies, when aged bitumen properties can be restored to original condition. The main focus of this research is to analyze bitumen rejuvenation process and implementation for pavement repair, to review of bitumen aging phenomenon. This paper presents a comprehensive literature analysis and explicit design of experiment subjected to HIR technology improvement. This analysis allowed to determine the main criteria for bitumen rejuvenation process and to indicate the further experimental activities for development of the advanced HPR technology.