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

PDFBrief16-4BBindersCreep propertiesStyrene butadiene styreneBenefit cost analysisEvaluationLouisianaLouisiana Transportation Research CenterCooper, Samuel, III.Louisiana Transportation Research CenterUS Transportation CollectionHigher tra\uef\uac\u192 c coupled with heavier loads led the asphalt industry to introduce polymer-modi\uef\uac? edbinders to enhance the durability and strength of HMA pavements. Numerous research projectsshowed that G*/Sin\uce\ub4, the high temperature speci\uef\uac? cation parameter for current PerformanceGraded (PG) asphalt binder is not adequate to re\uef\uac\u201a ect the rutting characteristics of modi\uef\uac? edbinders. Even though G*/Sin\uce\ub4 can capture the viscous and elastic e\uef\uac\u20ac ects of neat binders, it isunable to denote the bene\uef\uac? ts of elastomeric modi\uef\uac? cation of asphalt binder. Consequently, manystate DOTs have added supplemental speci\uef\uac? cations (\ue2\u20ac\u153PG-Plus\ue2\u20ac? tests) to identify the presenceof polymer modi\uef\uac? ed binders. Louisiana is among the states that are currently using a PG-Plusspeci\uef\uac? cation. Separation of Polymer, Force Ductility, Elastic Recovery tests are the required testsfor 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 speci\uef\uac? c, these tests can only determine the presence, not theperformance, of a modi\uef\uac? er