Phenol-rich bio-oils as free-radical scavengers to hinder oxidative aging in asphalt binder

Farideh Pahlavan, Anthony Lamanna, Ki Bum Park, Sk Faisal Kabir, Joo Sik Kim, Elham H. Fini

Research output: Contribution to journalArticlepeer-review

Abstract

This study examined the capability of phenol-rich bio-oils to improve the durability of bituminous composites by hindering oxidative aging in asphalt binder. Bio-oils derived from six wood-based bio-sources were introduced to asphalt binder, each specimen was then exposed to thermal aging. A chemical aging index was measured using Fourier-transform infrared spectroscopy, and a rheological aging index was measured using a dynamic shear rheometer. The results of the study showed that all phenol-rich bio-oils reduced the extent of aging in bio-modified binder, however, the bio-oils’ efficacy against aging varied, partly based on the content of their phenolic compounds. Computational modeling showed that the efficacy of each bio-oil is also affected by the molecular structures of its phenolic compounds, electron-donor substituents in the phenolic compound structure promote its antioxidant activity. The study outcomes show that using phenol-rich bio-oils can enhance the durability of asphalt binder while promoting a carbon-negative built environment.

Original languageEnglish (US)
Article number106601
JournalResources, Conservation and Recycling
Volume187
DOIs
StatePublished - Dec 2022

Keywords

  • Antioxidant
  • Asphalt binder
  • Carbon-negative
  • Oxidative aging
  • Phenol-rich bio-oil
  • Sustainability

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Economics and Econometrics

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