United States Department of Transportation
i
Evaluation of Rutting Potential of Hot Mix Asphalt Using the Asphalt Pavement Analyzer
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2002-11-01
[PDF-3.68 MB]
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TRIS Online Accession Number:00977169
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Edition:Final Report (September 1999 - September 2001)
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Abstract:A comprehensive study involving rut potential of Hot Mix Asphalt (HMA) was conducted. Both cylindrical and beam specimens of HMA were prepared using a Superpave Gyratory Compactor (SGC) and an Asphalt Vibratory Compactor (AVC), respectively. Mixture rutting performance was determined in the Asphalt Pavement Analyzer (APA). Initially, rut tests were conducted on three laboratory-prepared HMA specimens for 8000 cycles of loading with 100 psi hose pressure, 100 lb wheel load, and 50 seating cycles. The rut values (8,000 cycles) varied between 2.0 mm and 6.4 mm. Rut depths were found to be sensitive to temperature when compared to asphalt content. Subsequently, this study evaluated rut potential of 10 plant-produced mixes. Of these, 3 were Type A, 6 were Type B insoluble and 1 was Type C. Only one mix showed a rut depth of more than 4 mm. The AVC beam specimens showed higher rut depth compared to cylindrical specimens. The APA rut test data were analyzed to identify the important contributing factors. Type A mixes were sensitive to percent asphalt content, whereas Type B insoluble mixes were sensitive to material passing the number 200 sieve. This research investigated the relationship between rheological and mechanical properties for various Oklahoma unmodified and modified binders based on the asphalt mixture's rutting performance. The test results showed that binder Performance Grade(PG) affects mixture performance significantly. In general, modified binder showed better performance compared to the unmodified binders. Modified binders of the same PG did not show the same performance when test parameters were held constant. Binder viscosity and rut factor did not show significant effects on rutting performance of both modified and unmodified binders. Linear and nonlinear regression analyses were performed to investigate the contributions of binder properties to rutting. The nonlinear regression prediction of rutting was better than the linear prediction. This study identified the most significant factors from a number of factors, which affect rut potential of HMA.
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