Investigating the Addition of Organomontmorillonite Nanoclay and Its Effects on the Performance of Asphalt Binder
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 8
Abstract
Asphalt binder aging is a complex phenomenon that plays an essential role in reducing flexible pavement serviceability. The aging resistance of asphalt binder can be enhanced through the binder modification. This research investigates the impact of aging on unmodified and organo-montmorillonite (OMMT) nanoclay modified asphalt binders. In this study, laboratory aging is carried out for asphalt binders modified with two types of OMMT nanoclays at different dosages (2% and 4% by weight of the binder). The asphalt binders are subjected to short-term and long-term aging using a rolling thin-film oven and pressure aging vessel equipment. Rheological properties of the aged and unaged binders are determined using a dynamic shear rheometer. In addition, storage stability, full performance grading, and rutting resistance of the binders are evaluated and compared. Aging indices were calculated to investigate the aging behavior of the unmodified and modified binders. The results showed that the montmorillonite nanoclay-modified asphalts had improved resistance to aging compared with the unmodified binder.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors would like to acknowledge the National Research Council Canada for funding this study, Husky Energy for providing the asphalt binder for this work, and BYK Clays for providing the nanoclays. Also, the authors acknowledge the efforts of Jonathan Tomalty in reviewing this paper.
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© 2023 American Society of Civil Engineers.
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Received: Jun 13, 2022
Accepted: Nov 3, 2022
Published online: May 31, 2023
Published in print: Aug 1, 2023
Discussion open until: Oct 31, 2023
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