United States Department of Transportation
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Development of a Fatigue Testing Protocol for Supporting Integrated Design of Asphalt Pavement
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2023-07-28
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[PDF-8.19 MB]
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Edition:Final Report 6/8/2021 – 7/28/2023
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Abstract:This research study was sponsored by PennDOT and US DOT Transportation Research Center to evaluate the potential of the Hamburg wheel tracking device (HWTD) in determining the mix quality in terms of fatigue cracking resistance. The research work included applying changes to HWTD, developing the test setup and the experimental plan, conducting the tests and analysis, and finally developing a test protocol. The test setup included the HWTD, a data acquisition system and foil strain gauges to capture the strain response under repeated wheel tracking. The tests were conducted under two different temperatures and various support conditions. Various types of asphalt mixtures were included in the study. Specimens were in the form of rectangular slabs and were prepared from loose asphalt mixes through compaction. Based on the numerical analysis, a width of 6 inches was used for the majority of the slabs tested in this work. However, the experiment also included the 4-inch width for comparison. The thickness of the slab was also selected at three levels: 1, 1.5, and 2 inches, with the 1.5-inch thickness being the core thickness applied to most of the slabs. The experiment showed that as the width and the thickness become smaller, the strain amplitude and its corresponding growth rate become larger, exhibiting a higher rate of fatigue damage. It was also found that the rate of growth in strain amplitude during the test considerably increased when the binder content in the mix was decreased. The mix with 35% RAP content and a softer binder delivered lower growth in strain amplitude compared with the mix with no RAP. At the conclusion of the work, a test protocol in the AASHTO format was developed.
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