Preparation Process and Performance of Polyurethane-Modified Bitumen for Ultrathin Asphalt Layers
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 10
Abstract
To adapt to the high temperatures in the summer and resist the shrinkage effect caused by high-temperature differences, this study developed an asphalt material with excellent high-temperature stability and applied it to ultrathin asphalt layer technology to extend the service life of asphalt pavement. The base bitumen was modified using a polyurethane (PU) polymer, which had a significant influence on the high-temperature performance of the bitumen. To achieve the best modification effect, four response indicators (softening point, rutting factor, 135°C rotational viscosity, and dispersion coefficient) were used to evaluate the high-temperature stability, compatibility, and hot-storage stability of the PU-modified bitumen (PMB). Using grey relational analysis and principal component analysis, the four response indicators were transformed into a single-objective parameter (grey correlation degree) to optimize the best combination of parameters for the PMB preparation process. The test results showed that the comprehensive effects of the PMB on the preparation process parameters, from greatest to lowest, followed the order of PU content, shearing time, shearing temperature, and shearing speed, and the optimal process parameters were a PU content of 20%, shearing time of 60 min, shearing temperature of 155°C, and shearing speed of 2,500 rpm. The performance was as follows: a softening point of 90.2°C, rutting factor of 21.21 kPa, rotational viscosity of 2.24 Pa·s, and dispersion coefficient of 0.924. The PMB had good high-temperature stability and hot-storage stability, which allowed it to be effectively applied to ultrathin asphalt layer technology. The preparation process of the PMB provides a technical reference for the development of novel modified bitumen suitable for ultrathin asphalt layers.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The research was financially supported by the National Natural Science Foundation of China (No. 51978073).
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 10 • October 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Oct 31, 2022
Accepted: Mar 1, 2023
Published online: Jul 24, 2023
Published in print: Oct 1, 2023
Discussion open until: Dec 24, 2023
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