Microscopic Mechanism of Direct-Input Waste Plastic Modified Asphalt
Publication: Journal of Transportation Engineering, Part B: Pavements
Volume 148, Issue 2
Abstract
The continuous pollution of waste plastics to the ecological environment has attracted global attention. Using waste plastics in road construction can save energy, reduce pollution, and improve the high-temperature performance of asphalt mixtures. It will be the development trend of road materials in the future, but there have been few in-depth studies and evaluations on it. This study evaluated the microscopic characteristics of waste plastic modified asphalt. After the investigation and screening, this study used low-density polyethylene (LDPE) recycled materials in waste plastics as the main research object and used twin-screw extruders and instant dispersants to directly modify them and optimize the modification process parameters. In this way, a direct throw-in type of waste plastic asphalt modifier was prepared. Through fluorescence microscopy, infrared spectroscopy, scanning electron microscopy, gel chromatography, X-ray diffraction methods (XRD), and other technical means, the modification mechanism of direct-input waste plastic modified asphalt was analyzed. The test results show that the direct-input waste plastic modifier can achieve micron-level dispersion in the asphalt under the action of the instant dispersant, which can significantly improve the high-temperature performance of the asphalt mixture.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was sponsored by the National Key R&D Program of China (Grant No. 2018YFE0103800) and Fundamental Research Funds for the Central Universities, Chang’an University (Grant No. 300102219316). The authors gratefully acknowledge their financial support.
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Information
Published In
Journal of Transportation Engineering, Part B: Pavements
Volume 148 • Issue 2 • June 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Mar 23, 2021
Accepted: Nov 22, 2021
Published online: Jan 17, 2022
Published in print: Jun 1, 2022
Discussion open until: Jun 17, 2022
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