ABSTRACT
Hot in-place (HIR) maintenance technology is expected to reduce aggregate mining, protect the environment, and economize construction costs. The prevention of cracking is an important concern for HIR pavement, because of the high content of reclaimed asphalt pavement (RAP), which exhibits a relatively high level of aging. This study aims to investigate the cracking performance degradation after long-term aging. Two recycling plans and three aging conditions (loose mix aging 4h 12h, and 24h) were considered. The cracking resistance were analyzed in terms of linear viscoelastic (LVE) characteristics, fracture energy and fatigue damge, respectively. Results show that the change LVE properties can be observed under 24h aging, indicating the modulus of the mixture is not sensitive to aging over a longer period. However, The fracture energy and apparent damage capacity indices can capture the degradation of cracking resistances. In addition, the SBR modifier can be applied to enhance the long-term anti-cracking properties.
