Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Cesare Oliviero Rossi
ORCID logo ,
Paolino Caputo
ORCID logo ,
Saltanat Ashimova
,
Antonio Fabozzi
,
Gerardino D'Errico
* ORCID logo ,
Ruggero Angelico
* ORCID logo
Version 1 : Received: 24 July 2018 / Approved: 24 July 2018 / Online: 24 July 2018 (13:20:22 CEST)

A peer-reviewed article of this Preprint also exists.

Rossi, C.O.; 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. Rossi, C.O.; 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.

Abstract

Bitumen aging is the major factor which contributes 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 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.

Keywords

bitumen; antioxidant agent; rheology; electron paramagnetic resonance

Subject

Chemistry and Materials Science, Electronic, Optical and Magnetic Materials

Copyright: 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.

Download PDF Download Supplementary

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our Diversity statement.

Leave a public comment
Send a private comment to the author(s)
* All users must log in before leaving a comment
Views 0
Downloads 0
Comments 0
Metrics 0
Get PDF Supplementary Files Cite Share 0
Bookmark BibSonomy Mendeley Reddit Delicious
×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.