Hybrid life cycle assessment for asphalt mixtures with high RAP content

Qazi Aurangzeb, Imad L. Al-Qadi, Hasan Ozer, Rebekah Yang

Research output: Contribution to journalArticlepeer-review

183 Scopus citations


With the pavement industry adopting sustainable practices to align itself with the global notion of habitable environments, there has been growing use of life-cycle assessment (LCA). A hybrid LCA was used to analyze the environmental footprint of using a reclaimed asphalt pavement (RAP) content in asphalt binder mixtures. The analysis took into consideration the material, construction, and maintenance and rehabilitation phases of the pavement life cycle. The results showed significant reductions in energy consumption and greenhouse gas (GHG) emissions with an increase in RAP content. The contribution of the construction phase to the GHGs and energy consumption throughout pavement life cycle is minimal. Feedstock energy, though not consequential when comparing asphalt mixtures only, has a significant impact on total energy. Based on LCA analysis performed for various performance scenarios, breakeven performance levels were identified for mixtures with RAP. The study highlighted the importance of achieving equivalent field performance for mixtures with RAP and virgin mixtures.

Original languageEnglish (US)
Pages (from-to)77-86
Number of pages10
JournalResources, Conservation and Recycling
StatePublished - Feb 2014
Externally publishedYes


  • Asphalt pavements
  • Energy
  • Greenhouse gases (GHGs)
  • Hybrid
  • Life-cycle assessment (LCA)
  • Reclaimed asphalt pavement (RAP)
  • Sustainable pavement systems

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Economics and Econometrics


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