Fuel 212 (2018) 593–604 Contents lists available at ScienceDirect Fuel journal homepage: www.elsevier.com/locate/fuel Full Length Article Characterization of oxidized asphaltenes and the restorative eﬀect of a bio- modiﬁer a a a b, Farideh Pahlavan , Masoumeh Mousavi , Albert M. Hung , Elham H. Fini Innovation Center for Materials, Methods and Management, Division of Research and Economic Development, North Carolina A & T State University, 1601 E. Market St., Greensboro, NC 27411, USA Department of Civil, Architectural and Environmental Engineering, North Carolina A & T State University, 1601 E. Market St., Greensboro, NC 27411, USA GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: In this study, we use density functional theory (DFT) at a micro-level and laboratory experiments at a macro- Asphalt binder level to understand two phenomena: the molecular mechanisms responsible for the chemical aging of asphalt, Bio-rejuvenator and the restorative eﬀect of a new generation of bio-modiﬁers for treating aged asphalt. Our DFT-based studies Density functional theory (DFT) show that the interplay of a series of competing factors is responsible for enhancement of the intermolecular Oxidized asphaltene interactions in aged (oxidized) asphaltene dimers compared to unaged (unoxidized) forms. While electron- withdrawing groups of carbonyl (C]O) around
Fuel – Elsevier
Published: Jan 15, 2018
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