Use of Sustainable Lignin to Enhance Asphalt Binder and Mix Properties

Using sustainable, renewable substances that can be locally-sourced instead of petroleum-based asphalt binders would be better for our environment. Replacing a small portion (maximum of 6%) of asphalt binder with three different types of lignin was investigated to determine its effects on aged and unaged asphalt binder and mix. Commercially available Kraft lignin, lignin precipitated from black liquor in the laboratory, and lignin produced from rice hulls in the laboratory using a deep eutectic solvent partially replaced a standard asphalt binder (control) and the four binders were evaluated. Lignin improved the high temperature performance grade from PG 67 to PG 76 according to AASHTO M320 and from PG 67E to PG 76E according to AASHTO MP 19 (MSCR-based PG specification). All lignin-modified binders showed higher strain tolerance than unmodified binders in strain sweep test. Lignin precipitated from black liquor and lignin produced from rice hulls improved the long-term aging index. Rutting, cracking, and moisture damage susceptibility tests were performed on asphalt mix prepared with 6% lignin-modified (precipitated from black liquor) asphalt binder. Improved rutting resistance was observed with lignin-modified asphalt mix without sacrificing the moisture-induced damage resistance. Better cracking resistance with respect to increased flexibility index was observed according to semi-circular bend (SCB) test. Replacing petroleum-based binder with up to 6% of lignin precipitated from black liquor is feasible in hot mix asphalt (HMA).

  • Supplemental Notes:
    • This paper was sponsored by TRB committee AFK30 Standing Committee on Non-Binder Components of Asphalt Mixtures.
  • Corporate Authors:

    Transportation Research Board

    ,    
  • Authors:
    • Arafat, Shams
    • Kumar, Narendra
    • Wasiuddin, Nazimuddin M
    • Owhe, Ekugbere O
    • Lynam, Joan G
  • Conference:
  • Date: 2019

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References;
  • Pagination: 7p

Subject/Index Terms

Filing Info

  • Accession Number: 01698400
  • Record Type: Publication
  • Report/Paper Numbers: 19-01862
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 7 2018 9:38AM