Evaluation of Moisture Damage in Asphalt Mixtures at Macro- and Nanoscales
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 12
Abstract
The aim of this study was to examine the effects of different additives on the moisture resistance of asphalt binders using atomic force microscopy (AFM), and to correlate the results with those obtained in macroscale tests. To this end, AFM force spectroscopy was conducted on neat and polymer-modified asphalt binders produced using various warm mix asphalt (WMA) technologies. The technologies considered included Sasobit, Advera, foamed WMA, and Evotherm M1. Furthermore, the asphalt mixtures were prepared using the considered asphalt binders and were tested using the AASHTO T 283 test. The results of this study show that the most significant factor affecting the AFM adhesive forces of asphalt binders is the use of polymer additives. However, the interactions between various chemical groups in asphalt binders and the considered additives differ. Finally, it was found that the effect of aggregate-binder adhesive bonds on indirect tensile strength is greater than that of the binder’s cohesive bonds, as the cracking in this AASHTO T 283 test has more tendency to occur at the interface between the aggregate and the binder due to the high stress concentration.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
References
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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 2, 2020
Accepted: Apr 21, 2021
Published online: Sep 30, 2021
Published in print: Dec 1, 2021
Discussion open until: Feb 28, 2022
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