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- W618776027 abstract "The Hamburg wheel-tracking device (HWTD) has gained popularity for testing rutting and stripping potential of asphalt pavements. The life of Superpave pavements with out-of-specification density and air-void mixtures can be estimated based on the HWTD test results. However, a typical HWTD test takes about 6 to 6.5 hours to complete. This study focused on reducing the test duration by developing accelerated-mix testing models based on statistics. Six fine-graded Superpave mixtures with 12.5 mm nominal maximum aggregate size (NMAS) were selected for this study with air voids at Ndesign of 4%, simulated in-place density of 93%, two test temperatures (50°C and 60°C), and three load (158, 168, and 178 lb.) levels. Six-inch field cores from three projects were also tested in HWTD at two temperatures (50°C and 60°C) and three load (158, 168, and 178 lb.) levels for model evaluation. The average number of wheel passes to 20 mm rut depth, creep slope, stripping slope, and stripping inflection point derived from the HWTD test results were used in the statistical analysis to build accelerated-mix testing models. The results show that good consistency between the predicted and the observed test results was obtained when higher temperature and load levels are used. The test duration of HWTD can thus be reduced to two hours or less using accelerated testing (statistical) models. It is expected the use of HWTD will tremendously increase and it would be more effective for the quality control and quality assurance (QC/QA) of Superpave mixtures." @default.
- W618776027 created "2016-06-24" @default.
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- W618776027 date "2009-01-01" @default.
- W618776027 modified "2023-09-27" @default.
- W618776027 title "Development of Accelerated Superpave Mix Testing Models" @default.
- W618776027 hasPublicationYear "2009" @default.
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