Laboratory Investigation of PPG-TDI Polyurethane–Modified Asphalt Binders and Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 9
Abstract
Considering the defects of insufficient low-temperature flexibility and high cost of epoxy asphalt binder, low-cost polypropylene glycol (PPG) and toluene diisocyanate (TDI) were used to synthesize two polyurethane (PU) prepolymers (PTPU) with different isocyanate group (─ NCO) contents, and the properties of PTPU-modified asphalt binders and mixtures were studied. First, the mixing parameters of the PTPU-modified asphalt binders were determined through tests, and its storage stability, high- and low-temperature creep characteristics were studied. Then the microscopic modification mechanism of PTPU-modified asphalt binders was explored. Finally, the PTPU-modified asphalt binders were used to prepare mixtures, and the application performance in bridge deck pavement was evaluated. The results showed that PTPU-modified asphalt binder has satisfactory storage stability and high- and low-temperature performance. Chemical reactions occur during the modification process which change the micromorphology of the asphalt binder, and its high-and low-temperature performance and the adhesion to the aggregates are improved. The increase of -NCO content improves the high-temperature stability and mechanical strength of the PTPU-modified asphalt binder but reduces the flexibility. Hence, the ─ NCO content in PTPU can be adjusted according to actual needs during application. The PTPU-modified asphalt mixture has a good comprehensive performance, its low-temperature anticracking performance is improved greatly compared with that of epoxy asphalt mixture, and the lower price gives it good promotion and application prospects in engineering applications.
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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 supported by the Shaanxi Provincial Communication Construction Group (No. 17-06K) and the fund of Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University (No. QETHSP2020003).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 9 • September 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Sep 7, 2021
Accepted: Jan 10, 2022
Published online: Jun 24, 2022
Published in print: Sep 1, 2022
Discussion open until: Nov 24, 2022
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Cited by
- Li Wang, Zengping Zhang, Jia Sun, Hao Liu, Yongming Wei, Dali Zhang, Zhaofei Wang, Investigation on the High- and Low-Temperature Performance of Organic Rectorite and Polyurethane Composite-Modified Asphalt Binder, Journal of Materials in Civil Engineering, 10.1061/JMCEE7.MTENG-15896, 35, 9, (2023).