Performance of Dry Mixed Rubber–Plastic Composite Modified Asphalt Mixture
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 10
Abstract
In wet process–modified asphalt, the modifier is easily separated from the asphalt, resulting in poor storage stability. For traditional dry-mixed modified-asphalt mixtures, adding a single modifier to the mixture, it is difficult to improve the comprehensive performance of asphalt mixtures. In this study, rubber–polyethylene composite modified particles were added to a dry-mixed asphalt mixture. The rubber powder was first desulfurized using a twin-screw extruder and then blended and extruded with low-density polyethylene particles to form rubber–plastic composite particles. Then, the high- and low-temperature performance and water stability of the dry-mixed rubber–plastic composite modified asphalt mixture were evaluated. Finally, the asphalt in the rubber–plastic composite modified mixture was extracted. The microscale properties were tested to investigate the mechanism of the composite particles. The results indicated that the rubber–plastic composite modified particles improved the high-temperature deformation resistance of the mixture. Additionally, the low-temperature crack resistance and water stability were slightly improved. Compared with adding desulfurized rubber powder alone, the comprehensive performance of the asphalt mixture can be significantly improved by using a rubber–plastic composite.
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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
This study was supported by the National Key R&D Program of China (No. 2018YFE0103800), the Special Fund for Basic Scientific Research of Central College of Chang’an University (Nos. 300102219308 and 300102219316), Science and Technology Plan Project of Zhejiang Highway and Transportation Management Center (No. 211821200009), Science and Technology Planning Project of Zhejiang Provincial Department of Transportation (No. 2021041), and the Fundamental Research Funds for the Central Universities, CHD (No. 300102211703). The authors gratefully acknowledge their financial support.
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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: Aug 26, 2021
Accepted: Jan 27, 2022
Published online: Jul 19, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 19, 2022
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