Lecture6_Asphalt_testing_-_superpave - Asphalt Cements New...

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1 Asphalt Cements 1 New Superpave P erformance G raded Specification Some slides are courtesy of FHWA PG Specifications Fundamental properties related to pavement performance Environmental factors In-service & construction temperatures Short and long term aging 2 PG Specifications Based on rheological testing Rheology: study of flow and deformation Asphalt cement is a viscoelastic material Behavior depends on: Temperature Time of loading Aging (properties change with time) 3
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2 High Temperature Behavior High in-service temperature Desert climates Summer temperatures Viscous Liquid Sustained loads Slow moving trucks Intersections 4 Pavement Behavior (Warm Temperatures) Permanent deformation (rutting) Mixture is plastic <