Evaluating Effects of Ground Tire Rubber-Modified Asphalt and Dry Added Treated GTR on Performance Characteristics of RAP Mixtures

One approach to reduce the cost of asphalt mixtures and to produce environmentally friendly mixtures is to use more readily available recycled materials like Reclaimed Asphalt Pavements (RAP) and Ground Tire Rubber (GTR). In this study, GTR and Treated GTR were added to binder and to high RAP content mixtures. Rutting performance of the binders was evaluated by conducting the Multiple Stress Creep Recovery test, fatigue performance was evaluated by the Linear Amplitude Sweep test, and the degree of separation was measured by conducting the Cigar Tube Test . Also, the effect of a suspension agent on the degree of separation was determined. GTR and Treated GTR significantly improved the rutting and fatigue performance of the asphalt binders. The suspension agent successfully decreased the degree of separation between rubber particles and binder. GTR was introduced into the binder and the resulting rubberized binder was used to design a 9.5 mm Superpave mixture. The Treated GTR was directly added to the mixture. Treated GTR mixtures were mixed and compacted at lower temperatures compared to GTR mixtures. The dynamic modulus was determined using the Asphalt Mixture Performance Tester, reflective cracking performance was evaluated using the Texas Overlay Tester, low temperature cracking resistance was evaluated by the Thermal Stress Restrained Specimen Test, and rutting and moisture susceptibility was evaluated using the Hamburg Wheel Tracking Device. GTR and Treated GTR made the mixtures slightly more prone to reflective cracking, but improved their resistance to rutting, moisture susceptibility, and low temperature cracking.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK30 Characteristics of Nonasphalt Components of Asphalt Paving Mixtures.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Vahidi, Siavash
  • Mogawer, Walaa S
  • Booshehrian, Abbas
• Conference:
  • Transportation Research Board 92nd Annual Meeting
  • Location: Washington DC, United States
  • Date: 2013-1-13 to 2013-1-17
• Date: 2013

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 18p
• Monograph Title: TRB 92nd Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Asphalt rubber; Creep tests; Dynamic modulus of elasticity; Fatigue tests; Low temperature tests; Mechanical relaxation; Moisture damage; Pavement performance; Reclaimed asphalt pavements; Reflection cracking; Rutting
• Uncontrolled Terms: Ground tires; Moisture susceptibility
• Subject Areas: Environment; Highways; Materials; Pavements; I15: Environment; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01475716
• Record Type: Publication
• Report/Paper Numbers: 13-4248
• Files: TRIS, TRB, ATRI
• Created Date: Mar 15 2013 9:48AM