United States Department of Transportation
i
Development of a Balanced Mix Design Method in Oregon
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2020-11-01
[PDF-4.13 MB]
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Edition:Final Research Report
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Abstract:According to recent surveys conducted with state Department of Transportations (DOTs) and asphalt contractors, commonly used asphalt mixture properties are not directly reflecting the long-term performance of asphalt mixtures. In addition, there are several new additives, polymers, rubbers, and high-quality binder types incorporated into asphalt mixtures today. Volumetric mixture design methods are not capable of capturing the benefits of using all these new technologies on asphalt mixture performance. Furthermore, the interaction of virgin binders with reclaimed asphalt pavement (RAP) mixtures with high binder replacement contents and the level of RAP binder blending into the asphalt mixture are still not well understood. Due to all these complications related to the more complex structure of today’s asphalt mixtures, simple volumetric evaluations to determine the optimum binder content may not result in reliable asphalt mixture designs. Two volumetrically identical mixtures may provide completely different rutting and cracking performance according to laboratory tests. For all these reasons, in this study, a procedure to incorporate performance tests for rutting and cracking (with a new long-term aging protocol developed in this study) into current asphalt mixture design methods was developed to be able to validate or revise the optimum binder content determined by the volumetric mix design method. Developed balanced mix design method is expected to improve the long-term performance of asphalt-surfaced pavements in Oregon.
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