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Quantifying Thermomechanical Fatigue of Hot Mix Asphalt: A Feasibility Study
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2018-10-01
[PDF-3.99 MB]
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Edition:Final Report 1/15/2016 – 05/15/2018
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Abstract:Highway agencies and the research community have struggled for many years to improve the repeatability of lab tests that characterize the fracture and fatigue properties of hot mix asphalt (HMA) materials. The major source of uncertainty stems from the fact that specimens grossly deviate from the requirements of solid and continuum mechanic; thus the test protocols and interpretation schemes are inaccurate. Even though this mismatch between theory and experiment is pragmatic and practical for day-to-day use, a systematic experimental-theoretical-numerical paradigm is needed to evaluate the fracture and fatigue resistance of HMA materials; especially when subjected to boundary conditions imposed by common lab tests. The outcome of this study are laboratory results that can be used with certainty and improved test specifications and procedures that can delineate material-, equipment-, and operator-related uncertainties. In this study, the feasibility of adapting state-of-the-art testing techniques are evaluated towards understanding better the problems of fracture and fatigue in HMA.
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