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Evaluation of non-SBS modified binders using the multiple stress creep recovery test : [research project capsule].

Filetype[PDF-140.52 KB]


English
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  • Creators:
    Cooper, Samuel, III.
  • Corporate Creators:
    Louisiana Transportation Research Center
  • Subject/TRT Terms:
  • Publication/ Report Number:
    16-4B
  • Resource Type:
    Brief
  • Geographical Coverage:
    Louisiana
  • Corporate Publisher:
    Louisiana Transportation Research Center
  • Abstract:
    Higher traffic coupled with heavier loads led the asphalt industry to introduce polymer-modified binders to enhance the durability and strength of HMA pavements. Numerous research projects

    showed that G*/Sinδ, the high temperature specification parameter for current Performance Graded (PG) asphalt binder is not adequate to reflect the rutting characteristics of modified binders. Even though G*/Sinδ can capture the viscous and elastic effects of neat binders, it is unable to denote the benefits of elastomeric modification of asphalt binder. Consequently, many state DOTs have added supplemental specifications (“PG-Plus” tests) to identify the presence of polymer modified binders. Louisiana is among the states that are currently using a PG-Plus specification. Separation of Polymer, Force Ductility, Elastic Recovery tests are the required tests for the Louisiana Department of Transportation and Development (DOTD) PG-Plus requirement. However, most of these PG-Plus tests are unable to evaluate the performance of the polymer-enhanced binders. To be more specific, these tests can only determine the presence, not the performance, of a modifier.

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