United States Department of Transportation
i
Ruggedness and Interlaboratory Studies for Asphalt Mixture Performance Tester (AMPT) Cyclic Fatigue Test: Phase Ⅱ Report
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2023-06-01
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[PDF-2.83 MB]
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Edition:Phase II Report
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Abstract:This report highlights findings from Phase Ⅱ of a project designed to develop precision statements for cyclic fatigue testing using an asphalt mixture performance tester (AMPT). These standards include American Association of State Highway and Transportation Officials (AASHTO) TP 107-22 and AASHTO TP 133-21, which apply to 100-mm-diameter and 38-mm-diameter test specimens, respectively.(1,2) Seven laboratories participated in an interlaboratory study of the AMPT cyclic fatigue tests designed according to ASTM E691-20 and ASTM C670-15(4,5) . Researchers in these laboratories conducted dynamic modulus and cyclic fatigue testing of three mixtures for each specimen geometry. The results were used to establish repeatability and reproducibility precision limits for damage characteristic curve and failure criterion results of the AMPT cyclic fatigue tests; these limits reflect the variation in test results that will be exceeded with a probability of 5 percent if the test is executed properly. The researchers introduced a refined functional data metric to capture the variation in damage characteristic curve results. All precision limits were defined as a function of the mixture nominal maximum aggregate size (NMAS) except the failure criterion reproducibility, which did not follow a consistent trend with respect to NMAS. The established repeatability limits quantify the acceptable variation among three test determinations (specimens) obtained within a laboratory on a single material. The reproducibility limits quantify the acceptable variation between average test results of two laboratories conducted on the same material.
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