Ground tire rubber as a stabilizer for subgrade soils.

Details

• Creators:
  Cosentino, Paul J. ; Bleakley, Albert M. ; Armstrong, Alexander T. ; Misilo, Thaddeus J. ; Sajjadi, Amir M.
• Corporate Creators:
  Florida Institute of Technology. Civil Engineering Dept.
• Subject/TRT Terms:
  • Crumb rubber
  • Reclaimed rubber
  • Subgrade materials
  • Base course (Pavements)
  • Soil stabilization
  • Geotechnical engineering
• Publication/ Report Number:
  BDK81 977-03
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Corporate Publisher:
  Florida. Dept. of Transportation. Research Center
• Abstract:
  Over 250 million scrap tires are generated annually in the U.S. Historically, a significant portion of these tires ; have been processed into finely ground tire rubber (GTR), or crumb rubber, for use as an additive in hot mix asphalt ; (HMA) pavements to improve pavement performance. Recently, improved synthetic polymer additives have been ; developed that more economically provide the same performance improvements as GTR. This development has ; decreased the demand for GTR in HMA, potentially freeing supplies of GTR for other applications. ; Over the past two decades, the Florida Department of Transportation (FDOT) has conducted a significant amount ; of research on ways to re-use waste materials such as energy generation ash, tires, glass, reclaimed asphalt pavement, ; and reclaimed concrete in roadway construction. FDOT initiated this study to investigate whether blending GTR with ; subgrade soils would be a beneficial practice. ; The objective of this research was to determine the effect of GTR on subgrade soil engineering properties. Three ; representative sizes of GTR, 1 inch (25.4 mm), 3/8 inch (9.51 mm), and #40 (0.422 mm) were blended in varying ; percentages with three subgrade soils. Subgrade soils were selected with low, medium, and high limerock bearing ratio ; (LBR) strength. Blends were evaluated with 4, 8, 16, 24, and 32% GTR by volume. Blends were evaluated for grain ; size, moisture-density, LBR, permeability, consolidation, resilient modulus (Mr), and creep. ; Ground tire rubber does not make a good stabilizing agent for subgrade soils. Blending GTR with subgrade soils ; reduced both LBR and Mr significantly. Blending has minimal impact on consolidation or permeability. Blending ; increases creep in the tested soils, however the creep remained within acceptable limits. ; Blending GTR with soil did reduce the density of the blend. Additional research should be conducted to evaluate ; whether soil/GTR blends would be suitable for low-density fill applications where the benefits from reduction in ; vertical and horizontal soil pressures would offset the reduction in strength.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27311/dot_27311_DS1.pdf
• File Type:
  [PDF - 6.17 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:b782d5f7a51cc87ef851428e615cf3830d785ef96b40dc208c9aebda4a941212