Effect of Mineral Fillers on Oxidative Aging of Epoxy Bitumen
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 12
Abstract
This research involving two binders, a neat paving grade bitumen and an epoxy-diluted bitumen, evaluated the effect of hydrated lime and limestone filler on the oxidative age hardening of binders. A pressure aging vessel (PAV) unit was used to mimic long-term oxidative aging, and the rheological properties of binders containing fillers were measured using a dynamic shear rheometer. The active nature of hydrated lime with binders was further verified by conducting elongation-to-fracture tensile tests. Results indicate that the effect of the filler reactivity is much more pronounced in epoxy bitumen than in neat bitumen, with the pure limestone filler showing the highest stiffening effect. The epoxy bitumen containing limestone filler was also tougher, showing higher elongation-to-break than the mastics generated with hydrated lime. Even though the epoxy bitumen containing limestone was the strongest and toughest material, it exhibited higher susceptibility to fracture after 80 h in PAV than of the same binder with hydrated lime. This research verifies earlier studies that hydrated lime could improve the low-temperature properties, resulting in the reduction of the deleterious effects of oxidative age hardening in bituminous binders.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
Financial support from the Province of Gelderland and Province of Noord Holland on the Epoxy Modified Asphalt Concrete project is gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 12 • December 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Dec 31, 2020
Accepted: Apr 23, 2021
Published online: Sep 29, 2021
Published in print: Dec 1, 2021
Discussion open until: Feb 28, 2022
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Cited by
- Ruxin Jing, Panos Apostolidis, Xueyan Liu, Sandra Erkens, Tom Scarpas, First-Year Field Performance of Epoxy-Modified Asphalt, Transportation Research Record: Journal of the Transportation Research Board, 10.1177/03611981221121271, (036119812211212), (2022).