EVALUATION OF WOOD LIGNIN AS A SUBSTITUTE OR EXTENDER OF ASPHALT

The project was aimed at evaluating the use of lignins in three possible ways: (1) alone as a substitute for asphalt, (2) as an extender for asphalt cement in hot mixtures, and (3) as an extender of emulsified asphalt in conjunction with rubber in cold mixtures. Extensive screening of many binder candidates and formulations was made on the basis of binder properties and mixing with sand to make test cylinders. The most promising materials were further evaluated using both binder and full scale lignin asphalt pavement mixtures and were compared to conventional mixtures. Additional evaluation regarding environmental exposure, expected structural performance and economic feasibility was also included as a key part of the research. The general conclusions developed during this study are that both the technical and economic feasibilities of using wood lignin as a partial replacement for asphalt are positive. However, using lignin alone as a substitute for asphalt was not found to be possible in this study. Laboratory studies have shown that mixtures with lignin asphalt binders have similar and possibly improved engineering properties as compared to conventional paving mixtures. Although not currently economically feasible, lignin asphalt pavements will soon be a viable alternative as the cost of asphalt increases. (FHWA)

  • Corporate Authors:

    University of Washington, Seattle

    Department of Civil and Environmental Engineering, P.O. Box 352700
    Seattle, WA  United States  98195-2700

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Terrel, R L
  • Publication Date: 1980-10

Media Info

  • Pagination: 251 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00325955
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-RD-80-125 Final Rpt., FCP 34G1-053
  • Contract Numbers: DOT-FH-11-9092
  • Files: TRIS, USDOT
  • Created Date: Mar 12 1981 12:00AM