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The SHRP Superpave asphalt mixture design system, with its stringent material requirements was specifically developed to produce pavements to meet the expectations of the American public. The Superpave system includes a performance graded asphalt binder system, criteria for aggregate properties, a new mix design procedure using the Superpave gyratory compactor, and refined procedures and requirements for mixture analysis. To date, the Superpave system has primarily been used on medium to high volume roadways, where funding is more readily available. Issues concerning aggregate availability and local economy have limited its use on low volume roads at the local government level. Therefore, the question is: Can the material and testing requirements of the Superpave system be economically applied at the local government level without compromising pavement performance? To answer the above question, the two key requirements of the Superpave system, material requirements and testing requirements, were evaluated.
The objective of this study was to compare the Superpave mix design to the Marshall mix design on a typical aggregate source in Wyoming. The comparison concentrated on the resistance to rutting and low-temperature cracking of asphalt mixes prepared using the two design methods. Chapter 1 of this report provides an introduction. Chapter 2 contains a literature review related to the Marshal and Hveem mix design methods in addition to the newer Superpave level one mix design method. Chapter 3 describes the design of the experiment including information about the materials used in the study, the Marshall and Superpave level one mix designs, and the accelerated testing devices used in the study. Results from the Marshall and Superpave mix designs are summarized in Chapter 4. Chapter 5 contains the Georgia Loaded Wheel Tester and Thermal Stress Restrained Specimen Tester accelerated testing results on the Marshall and Superpave samples. Conclusions and recommendations based on the study are presented in Chapter 6.
This report summarizes the research devoted to three key aspects of the Superpave Level I mix design: volumetric mix design criteria for aggregates and mixes; compaction; and mix conditioning. The first chapter describes the Delphi group process that was used to select aggregate properties and specification values included in the Level I mix design procedure. Chapter 2 addresses the rationale for the selection of the gyratory compactor, its relations to field control, and validation. The final chapter summarizes the research associated with the development and validation of laboratory conditioning procedures for asphalt concrete mixes. It describes the procedures used to simulate both short- and long-term aging, as well as moisture sensitivity under repeated loading.
This laboratory manual presents Superpave mix design system in a complete, step-by-step format. It is intended for engineers and technicians in public and private organizations to use when designing paving mixes for all classes of highways, from farm-to-market roads to urban freeways. An essential companion to this manual is "The Superpave Mix Design System Manual of Specifications, Test Methods and Practices." The Superpave software program--"The Superpave Specification, Mix Design and Support Program"--And its users manual are also necessary to take full advantage of the mix design system.
Report on the testing of asphalt mixes including superpave level 1 mix which ties asphalt binder and aggregate selection into the mix design process, and considers traffic and climate.