1Introduction to Superpave•Strategic Highway Research Program (SHRP) was established by U.S. Congress in 1987 to conduct a 5-year study to improve the performance of roads in the U.S.•Of the U.S.$150 million budget, $50 million was spent on asphalt research.•SUPERPAVE (SUperior PERforming Asphalt PAVEments) is a product of the SHRP asphalt research.•SUPERPAVE consists of:(1)Asphalt Binder Specification.(2) Mixture Design and Analysis System.•Originally, there were 3 levels of Superpave mix design._______________________________________________Design Level Traffic, ESALsTesting Requirements 1 ESALs106Materials selection &volumetric proportioning2 106ESALs107Level 1 + performanceprediction tests3 ESALs107Level 1 + enhanced performance prediction tests•However, only Level 1 mix design can be implemented at this point.
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2SUPERPAVE BINDER TESTS1. Pressure Aging Vessel (PAV)•Simulates long term aging of binders in service.•Binders are aged in the standard RTFOT first.•50 g samples placed in pans and placed in the PAV.•Up to 10 pans can be placed in the PAV.•PAV temperatures: 90, 100 or 110 °C•PAV pressure: 2.1 MPa (300 psi)•PAV time duration: 20 hoursBottom of pressure aging vesselRack of individual pans(50g of asphalt / pan)Pressure Aging VesselVessel Lid Components