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Appl. Sci. 2018, 8(8), 1405; https://doi.org/10.3390/app8081405

Effects of Natural Antioxidant Agents on the Bitumen Aging Process: An EPR and Rheological Investigation

1
Department of Chemistry and Chemical Technologies, University of Calabria, I-87036 Arcavacata di Rende (CS), Italy
2
Department of Chemical Sciences, University of Naples Federico II, Complesso di Monte S. Angelo, via Cinthia, I-80126 Naples (NA), Italy
3
CSGI (Center for Colloid and Surface Science), Via della Lastruccia 3, I-50019 Sesto Fiorentino (FI), Italy
4
Department of Agricultural, Environmental and Food Sciences, University of Molise, Via De Sanctis, I-86100 Campobasso (CB), Italy
*
Authors to whom correspondence should be addressed.
Received: 24 July 2018 / Revised: 14 August 2018 / Accepted: 15 August 2018 / Published: 19 August 2018
(This article belongs to the Section Materials)
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Abstract

Bitumen aging is the major factor contributing to the deterioration of the road pavement. Oxidation and volatilization are generally considered as the most important phenomena affecting aging in asphalt paving mixtures. The present study was carried out to investigate whether various antioxidants provided by natural resources such as phospholipids, ascorbic acid as well as lignin from rice husk, could be used to reduce age hardening in asphalt binders. A selected bituminous material was modified by adding 2% w/w of the anti-aging natural additives and subjected to accelerated oxidative aging regimes according to the Rolling Thin Film Oven Test (RTFOT) method. The effects of aging were evaluated based on changes in sol-gel transition temperature of modified bitumens measured through Dynamic Shear Rheology (DSR). Moreover, changes of Electron Paramagnetic Resonance (EPR) spectra were monitored on the bituminous fractions asphaltene and maltene separated by solvent extraction upon oxidative aging. The phospholipids-treated binder exhibited the highest resistance to oxidation and the lowest age-hardening effect compared to the other tested anti-oxidants. The combination of EPR and DSR techniques represents a promising method for elucidating the changes in associated complex properties of bitumen fractions promoted by addition of free radical scavengers borrowed by green resources. View Full-Text
Keywords: bitumen; antioxidant agent; rheology; electron paramagnetic resonance bitumen; antioxidant agent; rheology; electron paramagnetic resonance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Oliviero Rossi, C.; Caputo, P.; Ashimova, S.; Fabozzi, A.; D’Errico, G.; Angelico, R. Effects of Natural Antioxidant Agents on the Bitumen Aging Process: An EPR and Rheological Investigation. Appl. Sci. 2018, 8, 1405.

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