Effect of Rejuvenators on Moisture Susceptibility Based on Chemical Property Characterization and Mechanical Performance Behavior

Many studies have presented alterations of mechanical responses with moisture damage of asphalt mixtures with different rejuvenating agents; however, fundamental chemical origins of such alterations in moisture resistance of mixtures are not completely clear. A better understanding of such relation can lead to a more appropriate use/selection of rejuvenating agents. This study examined chemical properties of rejuvenators to identify their linkage with mechanical moisture susceptibility of asphalt concrete mixtures. Toward that end, two chemically different rejuvenators were selected and altered with a field aged binder, virgin binder, and a warm mix asphalt (WMA) additive. Chemically, different binders considered were characterized by saturates-aromatics-resins-asphaltenes (SARA) analysis and Fourier-transform infrared (FT-IR) spectroscopy. For mechanical behavior, the semicircular bending (SCB) fracture test was conducted with/without moisture conditioning. The chemical analysis indicated that tall oil rejuvenator including hydrogen bonds are highly sensitive to reaction by water, while aromatic extracts rejuvenator without -OH functional group did not show sensitive moisture damage. The SCB test results agreed well with the chemical analysis results such that the mixture treated by tall oil rejuvenator was highly susceptible to moisture damage compared to others. It was also shown that the moisture resistance of mixtures improved when the colloidal index (CI) of binder decreased. The integrated chemical-mechanical approach herein helped understand driving mechanisms of moisture damage in rejuvenated asphalt mixtures.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders.
• Authors:
  • Haghshenas, Hamzeh
  • Morton, M D
  • Kim, Y-R
  • Smith, Thomas
  • Haghshenas, D F
• 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
• Features: Figures; References; Tables;
• Pagination: 6p

Subject/Index Terms

• TRT Terms: Asphalt concrete pavements; Bending; Chemical properties; Mechanics; Moisture damage; Pavement performance; Rejuvenators
• Uncontrolled Terms: Semicircular bending test
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01661029
• Record Type: Publication
• Report/Paper Numbers: 18-01921
• Files: TRIS, TRB, ATRI
• Created Date: Feb 23 2018 4:28PM