Connections between the rheological and chemical properties of long-term aged asphalt binders

Yuhong Wang, Yong Wen, Kecheng Zhao, Dan Chong, Jianming Wei

Research output: Journal article publicationJournal articleAcademic researchpeer-review

23 Citations (Scopus)

Abstract

Asphalts aged in laboratory conditions have been extensively studied, but those aged in hot-mixed asphalt (HMA) mixtures in the field receive less attention. Particularly missing are the aging characteristics of asphalts in long-life HMA pavements. In this study, the rheological and chemical properties of asphalts that were aged in HMA pavements for 7 and 36 years were examined, including the variations of these properties with pavement depth and their interrelationships. The analysis results suggest that (1) severe asphalt binder aging occurred at the deepest pavement layer, (2) material type and pavement depth affect aging rate, (3) asphalt binder from the deepest layer showed a loss of saturates, (4) binders' two important rheological properties are well related to asphaltenes content and ketone formation, and (5) age hardening apparently is affected more by the increase of dispersion volume and size than by the viscosity of the suspension medium. These findings not only prove that asphalt binder aging is a legitimate concern for the durability of long-life HMA pavements, but also lay a foundation for future research to tackle this issue.
Original languageEnglish
Article number04014248
JournalJournal of Materials in Civil Engineering
Volume27
Issue number9
DOIs
Publication statusPublished - 1 Jan 2015

Keywords

  • Aging
  • Asphalt
  • Deterioration
  • Flexible pavement

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials

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