Rejuvenators for Asphalt Binders Using Oil Extracted from Spent Coffee Grounds

Interest in recycling and reuse of various waste materials has been growing over the years especially with increasing environmental awareness and public health concerns. This paper explores the opportunity to recycle spent coffee grounds (SCG) as a modifier for reclaimed asphalt binders. In the scope of the study, oil extracted from SCG is incorporated at various percentages in PG 58-XX virgin and laboratory aged PG 76-XX asphalt binders. The rheological properties of the blends are characterized using dynamic shear and multiple stress creep and recovery following ASTM and AASHTO standards. Accordingly, it is observed that blending the extracted oil with asphalt restores the binder’s linear behavior and increases the softening of the blend thus altering the high temperature PG grade. Moreover, the rejuvenated aged asphalt exhibits higher strain recovery at low stress levels as compared to the control un-aged binder. This, in fact, lowers its susceptibility to permanent damage when used in asphalt concrete mixtures.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: pp 666-676
  • Monograph Title: Geo-Chicago 2016: Geotechnics for Sustainable Energy

Subject/Index Terms

Filing Info

  • Accession Number: 01612416
  • Record Type: Publication
  • ISBN: 9780784480137
  • Files: TRIS, ASCE
  • Created Date: Aug 11 2016 3:07PM