Surface Modification of Basalt Aggregate by Coupling Agent to Improve the Interfacial Adhesion with Asphalt Binder
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 8
Abstract
The surface performance of basalt aggregate shows a great influence on the interfacial adhesion between basalt aggregate and asphalt binder and further affects the moisture stability of the asphalt mixture. To improve the interfacial adhesion between basalt aggregate and asphalt binder, as well as to increase the moisture stability of asphalt mixture in hot and humid environments, the basalt aggregate surface was hydrophobically modified by silane coupling agents (SCAs). Microscopically, the surface properties of basalt aggregate before and after surface modification by SCAs were characterized by environmental scanning electron microscope and Fourier transform infrared spectrometer, as well as the adhesion work between basalt aggregate and asphalt was calculated. Macroscopically, the moisture stability of the asphalt mixture was verified by boiling test and asphalt mixture tests. Test results indicate that the surface free energy values of basalt aggregates modified by SCAs and the stripping work values are decreased. Additionally, silanols, hydrogen bonds, and fibrous protrusions are introduced to the aggregate surface for improving the compactness of the asphalt-aggregate system. Finally, the loss rates of asphalt film and immersion scattering are decreased, as well as the freeze-thaw splitting tensile strength ratio is increased. The hydrophobic surface modification of basalt aggregate can enhance the moisture stability of the asphalt mixture.
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
The authors would like to thank the financial support from the National Natural Science Foundation of China, China (No. 52278452), A Project Funded by the National First-class Disciplines (PNFD), and the Jiangsu Provincial Department of Education for the Qing Lan Project.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 8 • August 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Oct 10, 2022
Accepted: Jan 11, 2023
Published online: May 29, 2023
Published in print: Aug 1, 2023
Discussion open until: Oct 29, 2023
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