Effects of Elemental Sulfur on the Aging Trajectory and Adhesion Characteristics of Rubber-Modified Bitumen

Albert Hung, Mingxia Li, Elham H. Fini

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

This study examines the role of sulfur in rubber-modified bitumen and its response to ultraviolet (UV) exposure in terms of its viscoelasticity, creep recovery, healing behavior, surface chemical oxidation, and surface adhesion. Infrared spectroscopy showed a pronounced enrichment of oxidized sulfur and carbon compounds at the surface of sulfur-modified bitumen after mild heating and especially after UV irradiation. 3% added sulfur increased bitumen plasticity by all measures. UV aging marginally decreased bulk metrics of self-healing, but it severely diminished surface adhesion values, indicating that bulk metrics may not be able to accurately reflect crack-healing behavior if bitumen surfaces are prone to oxidative degradation.

Original languageEnglish (US)
Pages (from-to)16918-16925
Number of pages8
JournalACS Sustainable Chemistry and Engineering
Volume9
Issue number50
DOIs
StatePublished - Dec 20 2021

Keywords

  • Aging
  • Asphalt
  • Bitumen
  • FTIR
  • Healing
  • Oxidation
  • Rheology
  • Sulfur
  • UV

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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