Asphaltene Agglomeration Through Physical-Chemical and Rheological Testing
Résumé
Binder aging has long been recognized as one of the key factors behind several types of pavement distresses. A better understanding of the changes in binder chemistry and microstructure triggered by aging is fundamental as they increase the cracking susceptibility of asphalt materials and reduce pavement durability, one of its main life-cycle cost analysis (LCCA) drivers. In this context, this paper presents the findings of a collaborative study that delves further into the alterations in binder chemistry, microstructure, and rheology of laboratory-and field-aged binders using innovative experimental and fundamental theory techniques developed by partner teams. An increase in polarity leading to a shift in the apparent molecular weight distribution (AMWD) towards higher molecular weights, which implies molecular agglomerations, could be observed as a result of oxidation via Saturates, Aromatics, Resins, and Asphaltene Determinator (SAR-AD) and Size Exclusion Chromatography (SEC), respectively. As for the theoretical methods, the δ-method and Molecular Agglomeration Index (MAI) estimate the AMWD and incidence of molecular agglomeration, respectively, solely from binder rheology. Both methods show satisfactory relationship with the SAR-AD and SEC results. This reinforces the soundness of the δ-method and MAI.
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Licence : CC BY NC ND - Paternité - Pas d'utilisation commerciale - Pas de modification