Implications of Changing Asphalt Binder Sources on Engineering Properties of Traditional and Balanced Asphalt Mixtures
Publication: International Conference on Transportation and Development 2022
ABSTRACT
This paper reports on the impacts that different sources of asphalt binders, which satisfactorily met the grading requirements of a PG 70-22 binder, have on the mechanical performance of two Superpave mixtures, namely a traditional mix design and a balanced mix design. Five asphalt binders were acquired from different asphalt suppliers. Superpave mixtures were designed and produced with two different aggregate gradations, and similar recycled material content following both volumetric-based and performance-based design approaches. For performance testing, the Hamburg wheel tracking device and Texas overlay tester tests were used as the main rutting and cracking tests, respectively, during the design process. The Illinois Flexibility Index Test and indirect tensile asphalt cracking tests were performed as surrogate cracking tests. From this study, the voids in the mineral aggregate parameter does not differentiate the impact of changing the asphalt binder source. The mechanical tests were sensitive to changes in binder source, which demonstrated the importance of incorporating a performance testing stage to current design specifications. The asphalt mixtures denoted as balanced mix designs in this study yielded acceptable mechanical and volumetric properties regardless of the binder source.
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International Conference on Transportation and Development 2022
Pages: 269 - 282
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Published online: Aug 31, 2022
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