Effect of Aging and Rejuvenation on Surface Free Energy Measurements and Adhesive Property of Asphalt Mixtures

Physio-chemical changes occur in asphalt binder during the aging process, which could result in pavement distresses. Binder aging affects the intrinsic characteristics of pavement. A PG 64-22 binder was aged to simulate pavement aging during construction and in-service. The binder surface tension property, i.e., the contact angle between the binder and three liquids, was measured using a sessile drop device. This property was then used to estimate surface free energy (SFE) components of control binder, aged binders, and binders with two rejuvenators, using Good-van-Oss-Chaudhury’s postulation. Cohesive and adhesive bond energies of an asphalt–aggregate mixture system under dry and wet condition were also analyzed. The aggregates considered were limestone and granite; these aggregates have different moisture affinity. The data showed that as asphalt ages, the contact angle between a liquid (distilled water) and asphalt surface increases; however, for the other two liquids (formamide and glycerol), no pattern was observed. For the SFE components of the control binder, the binder aged at various levels, and the binder with rejuvenators, the contribution from Lifshitz-Waals components were comparatively much higher than that from acidic and basic components. The rejuvenators seemed to be effective in improving the cohesive energy of asphalt binder, suggesting improvement in water damage resistance of the mix. In general, the limestone-based asphalt concrete (AC) mixture showed a higher moisture damage resistance than the AC mixture with granite.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders.
• Authors:
  • Hossain, Kamal
  • Karakas, Ahmet
  • Singhvi, Punit
  • Ozer, Hasan
  • Al-Qadi, Imad L
• Conference:
  • Transportation Research Board 97th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2018-1-7 to 2018-1-11
• Date: 2018

Language

• English

Media Info

• Media Type: Digital/other
• Pagination: 2p

Subject/Index Terms

• TRT Terms: Adhesion; Aging (Materials); Asphalt mixtures; Free energy; Surface dynamics
• Uncontrolled Terms: Rejuvenation
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01663685
• Record Type: Publication
• Report/Paper Numbers: 18-06052
• Files: TRIS, TRB, ATRI
• Created Date: Mar 22 2018 11:57AM