TIME
15：30 - 16：30, July 12th, 2024
LOCATION
Room 322, School of Transportation
INTRODUCTION
With the increasing proportion of recycled asphalt pavement(RAP) materials being used in new asphalt mixtures, the regeneration of asphalt continues to attract attention in the field of road engineering. Although a large amount of research has evaluated the regeneration and repeated use of aged asphalt, the understanding of the basic mechanism of regeneration process is still insufficient, and the theoretical basis and effectiveness of the selection of regeneration agents are not yet clear. This paper proposes a regeneration agent selection method based on the Hansen Solubility Parameters(HSP). In order to verify the feasibility of this method, rheological and chemical tests as well as solubility tests were conducted. The results show that efficient regeneration agents have similar HSP to asphalt and have a relatively large HSP radius. The overlap ratio of Hansen spheres between asphalt and regeneration agents can be used as a reliable tool for screening efficient regeneration agents. In addition, it was found that the efficiency of regeneration agents is linearly correlated with the overlap ratio of Hansen spheres between asphalt and regeneration agents. The asphalt master curve analysis and the four-component test further verify the feasibility of the HSP-based regeneration agent selection method.