Application of Rejuvenating Agents to Improve Aged Asphalt Rheological and Physical Properties

The use of reclaimed asphalt pavement (RAP) in neat asphalt mixture has gained interest due to it's significant economic and environmental benefits. However, recycled asphalt is highly aged and when blended with neat asphalt at high percentages, it can negatively impact the overall blend’s performance. Rejuvenators have been used to improve certain properties of aged asphalt and consequently the performance of the overall blend. This paper investigates the merits of introducing different types of rejuvenators to a laboratory aged asphalt while examining the overall blend’s rheological and surface properties. Accordingly, the dynamic shear rheometer was used to determine the rheological properties of several blends containing aged asphalt and rejuvenators. The surface properties were evaluated using the contact angles of each blend subjected to water conditioning; the latter was specifically used to investigate the moisture susceptibility of each blend. Study results showed that all rejuvenators were able to reduce complex modulus of aged asphalt binder. In addition, all but one studied rejuvenator was found to be effective in reducing moisture susceptibility of the aged asphalt binder as evidenced by the reduction in the extent of change between dry and wet contact angles.

  • Supplemental Notes:
    • This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders.
  • Corporate Authors:

    Transportation Research Board

    ,    
  • Authors:
    • Rajib, Amirul Islam
    • Oldham, Daniel
    • Fini, Ellie H
  • Conference:
  • Date: 2019

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 6p

Subject/Index Terms

Filing Info

  • Accession Number: 01698425
  • Record Type: Publication
  • Report/Paper Numbers: 19-02358
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 7 2018 9:23AM