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Research Projects
Crumb Rubber Modified Open Graded Friction Course Asphalt Pavement

The objective of this study is to evaluate the effects of rubber modified binders on the performance of porous asphalt mixtures. The performance measures will include binder draindown, mix permeability, rutting resistance, and resistance to abrasion (raveling). To accomplish the objective of this study, several tasks will be completed in sequence. These four main tasks include:

  1. Conduct a review of the literature related to rubber modified asphalt and porous asphalt.
  2. Develop draindown curves for each mixture to determine the mixture sensitivity to draindown based on binder content. These curves will also aid in the determination of the optimum binder content for each mixture. In total, a minimum of 160 specimens will be tested.
  3. Prepare specimens and measure the volumetric properties (density, porosity, VMA, VFA, and stone-on-stone contact) and performance properties (permeability, rutting susceptibility, raveling susceptibility, and long-term mix draindown potential) for each mixture. In total, a minimum of 192 specimens will be tested.
  4. Compile Results and Prepare a Final Report

The variables included in this study are:

  • Aggregate Gradation - Two Gradations from the same aggregate source will be used
  • Asphalt binder PG 64-22 and PG 76-22 binders will serve as the control binders and four rubber modified binders will also be evaluated using the PG 64-22 binder as the base. The rubber modified binder will consist of 5% -30 mesh ambient Ground Tire Rubber (GTR), 12% -30 mesh ambient GTR, 18% -14 mesh ambient GTR, and GTR pellets.
  • Fiber stabilizers cellulose fiber will be added to the PG 64-22 and PG 76-22 mixtures not including GTR to serve as a reference. All mixtures (including PG 64-22 and PG 76-22) will be made without fibers.




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