THERMAL CONDUCTIVITY OF RECYCLED TIRE RUBBER TO BE USED AS INSULATING FILL BENEATH ROADWAYS

Under the present federal highway funding act, Intermodal Surface Transportation Efficiency Act (ISTEA) of 1991, used tires in all states must be either combined with highway pavements or recycled as consumer products in increasing amounts. One possible use of tires in Alaska is to shred, chop or grind tires into small particles and use this material as an insulating fill to reduce thaw or freeze penetration beneath roads. This study presents the results of measuring thermal conductivities of frozen and unfrozen ground and shredded tire rubber of various sizes and at three compactions. Thermal conductivities ranged from 0.059 to 0.096 BTU/hr-ft-F0 for crumb rubber, 0.056 to 0.080 BTU/hr-ft-F0 for rubber buffings, and 0.071 to 0.10 BTU/hr-ft-F0 for rubber chips. Resilient moduli of the two smaller types of rubber samples were also measured in a triaxial test cell. Values ranged from 94 psi at a confining pressure of 5 psi up to 215 psi at a confining pressure of 15 psi.

• Record URL:
  • http://www.dot.state.ak.us/stwddes/research/assets/pdf/ine_trc_94_12.pdf
• 
• Corporate Authors:

  Alaska Department of Transportation and Public Facilities

  2301 Peger Road
  Fairbanks, AK  United States  99701

  University of Alaska, Fairbanks

  Institute of Northern Engineering, P.O. Box 755910
  Fairbanks, AK  United States  99775-5900
• Authors:
  • Shao, J
  • Zarling, J
• Publication Date: 1995-2

Language

• English

Media Info

• Pagination: 70 p.

Subject/Index Terms

• TRT Terms: Confining pressure; Fills; Freezing; Highways; Insulating materials; Modulus of resilience; Pavements; Recycled materials; Rubber; Thaw; Thermal analysis; Thermal conductivity; Tires
• Geographic Terms: Alaska
• Subject Areas: Geotechnology; Highways; Materials; Pavements; Vehicles and Equipment; I35: Miscellaneous Materials;

Filing Info

• Accession Number: 00942287
• Record Type: Publication
• Report/Paper Numbers: INE/TRC 94.12,, SPR-UAF-93-09A,, Final Report
• Files: TRIS, STATEDOT
• Created Date: May 6 2003 12:00AM