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6506-13 - Introduction to Superpave Strategic Highway...

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1 Introduction 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 (SU perior PER forming Asphalt PAVE ments) 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, ESALs Testing Requirements 1 ESALs 10 6 Materials selection & volumetric proportioning 2 10 6 ESALs 10 7 Level 1 + performance prediction tests 3 ESALs 10 7 Level 1 + enhanced performance prediction tests However, only Level 1 mix design can be implemented at this point.
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2 SUPERPAVE BINDER TESTS 1. 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 hours Bottom of pressure aging vessel Rack of individual pans (50g of asphalt / pan) Pressure Aging Vessel Vessel Lid Components
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