Modeling the Dynamic Modulus of Asphalt Mixtures Using Single-value Test Results Phase II: Relation Between E* Parameters and CT Index
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2024-01-01
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Edition:Final Report Nov 2022 – Nov 2023
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Abstract:This report outlines the development of relations between the IDEAL-CT test results and the dynamic modulus of asphalt mixtures. In this, the second phase of a four-phase study, the theoretical results obtained as part of Phase I were validated by measuring dynamic modulus and cracking tolerance index values on nine different mixtures; seven of these mixtures were plant-produced and two of them were lab-produced. Eight of the mixtures were prepared with PG 64-34 asphalt binders and one was prepared with PG 58-28 asphalt binder. Based on the test results obtained, two relations were developed between two parameters that define the dynamic modulus master curve and the cracking energy (area under the force deformation curve) and the cracking tolerance (CT) index. Using these two relations, the dynamic modulus master curve was predicted within an absolute difference of 17.2% with respect to the measured values in eight of the nine mixtures. Larger differences were observed for the mixture prepared with the PG 58-28 asphalt binder indicating that adjustments need to be made for different types of mixtures. The conclusion of this work is that there is a relation between different tests and that the dynamic modulus of asphalt mixtures can be predicted within acceptable accuracy, especially at intermediate temperatures, using only the IDEAL-CT test. While measuring the actual dynamic modulus of asphalt mixtures continues to be the desirable option, the complexities and time demands of such tests make the use of simplified relations, albeit imperfect, a very attractive option. Further work is needed to expand the work to different mixtures and to different temperatures.
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