Exploration of the Potential Prospect of Rare Earth Compounds in the Antiaging of Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 10
Abstract
In order to mitigate the effects of thermal-oxidative and ultraviolet (UV) aging on asphalt pavements during service, we explored the influence law of rare earth compounds on the aging properties of asphalt and the antiaging mechanism. The asphalt was subjected to thermal-oxidative and UV aging tests by using a thin-film aging oven as well as a UV aging oven. The changes of macroscopic and microscopic properties of three rare earth–modified asphalts before and after aging with base asphalt were studied by using basic physical property tests, dynamic shear rheology tests, and Fourier infrared spectroscopy comparisons. The results showed that the rare earth–modified asphalt had significantly improved in deformation resistance and high-temperature stability compared with the base asphalt. After aging, the change of carbonyl and sulfoxide functional group indexes of rare earth–modified asphalt was significantly slowed down compared with the base asphalt. It showed that the incorporation of rare earth compounds has a direct effect on the improvement of the aging resistance of asphalt. Regarding the three types of rare earth–modified asphalt, cerium oxide–modified asphalt showed better improvement in thermal-oxidative and UV aging resistance.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors gratefully acknowledge financial support from National Key research and development Program and Transportation Science and Technology Development Plan of Tianjin (No. 2019-14).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 10 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Nov 16, 2021
Accepted: Feb 17, 2022
Published online: Jul 29, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 29, 2022
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