Investigation on the High- and Low-Temperature Performance of Organic Rectorite and Polyurethane Composite-Modified Asphalt Binder
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 9
Abstract
Organic rectorite (OREC) can significantly improve the resistance of asphalt to deformation and aging, but it tends to cause low-temperature cracking. To solve this defect, a novel idea that develops an OREC and polyurethane (PU) composite-modified asphalt binder has been put forward in this work. Various modified asphalt binder systems containing different combinations of OREC and PU contents were prepared by the melt blending method. The storage stability of the OREC/PU-modified asphalt binders was studied. The high- and low-temperature properties of binders were investigated by dynamic shear rheometer and bending beam rheometer tests. The microstructure and modification mechanism of the binders were characterized by gel permeation chromatography, differential scanning calorimetry, and Fourier transforms infrared spectroscopy. The results showed that the OREC/PU-modified asphalt binder displayed good high-temperature storage stability. However, excessively high content of OREC will adversely affect the storage stability of asphalt. In the 2% by weight OREC/9% by weight PU modified asphalt system, OREC and PU exhibited excellent synergistic effects. And the high- and low-temperature properties of the asphalt were significantly improved. The introduction of OREC/PU reduces the of the asphalt binder and the enthalpy during temperature change. The modified asphalt has good low-temperature flexibility through the physical and chemical interaction between polyurethane and asphalt during the modification process. PU can intercalate OREC and react with active hydrogens in asphalt to generate cross-linked structures to enhance the high- and low-temperature properties of the asphalt binder.
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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 authors are grateful for the funding provided 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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Journal of Materials in Civil Engineering
Volume 35 • Issue 9 • September 2023
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© 2023 American Society of Civil Engineers.
History
Received: Oct 31, 2022
Accepted: Feb 17, 2023
Published online: Jun 26, 2023
Published in print: Sep 1, 2023
Discussion open until: Nov 26, 2023
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