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Evaluation of non-SBS modified binders using the multiple stress creep recovery test : [research project capsule].
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    Higher traffi c coupled with heavier loads led the asphalt industry to introduce polymer-modifi ed binders to enhance the durability and strength of HMA pavements. Numerous research projects showed that G*/Sinδ, the high temperature specifi cation parameter for current Performance Graded (PG) asphalt binder is not adequate to refl ect the rutting characteristics of modifi ed binders. Even though G*/Sinδ can capture the viscous and elastic eff ects of neat binders, it is unable to denote the benefi ts of elastomeric modifi cation of asphalt binder. Consequently, many state DOTs have added supplemental specifi cations (“PG-Plus” tests) to identify the presence of polymer modifi ed binders. Louisiana is among the states that are currently using a PG-Plus specifi cation. 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 specifi c, these tests can only determine the presence, not the performance, of a modifi er.
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