Effect of High-Speed Shear Preparation Conditions on Asphalt Aging and Prevention of Asphalt Aging
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 11
Abstract
In this research, to study the effect of a high-speed shearing method on asphalt aging, based on SK-70# matrix asphalt, the influences of the shear time, shear rate, shear temperature, shear ring, and air on asphalt aging were investigated by using penetration, a 5°C force ductility value, and a softening point as indexes and a high-shear emulsifier as the shear preparation instrument. The results show that oxygen aging in air is the main factor causing asphalt aging during high-speed shearing in laboratory experiments. A device that prevents asphalt from aging during high-speed shearing was invented. The device and method can effectively eliminate the contact between asphalt and oxygen in the preparation of asphalt and remove the heat generated inside the asphalt. A nitrogen layer is formed on top of the asphalt sample, which can prevent oxidation and reduce the temperature of asphalt to solve the asphalt aging problem in high-speed shear preparation. Subsequently, styrene-butadiene-styrene triblock copolymer (SBS)-modified asphalt was used to carry out relevant tests to verify the equipment and method, which proved the reliability of its preventive effect. This study has important reference significance for reducing the influence of thermal oxidation aging and accurately evaluating the properties of modifiers in the preparation of modified asphalt by a high-speed shear machine, providing important technological measures for the preparation of modified asphalt in the future.
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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 research was funded by the National Natural Science Foundation of China (No. 51778096) and the Natural Science Foundation Project of CQ CSTC (No. cstc2016jcyjA0119). The authors would like to gratefully acknowledge financial support from the National Natural Science Foundation of China and the Natural Science Foundation Project of CQ CSTC. Junxi He and Gang Huang contributed equally to this work, and Junxi He and Gang Huang are cofirst authors.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 11 • November 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Sep 5, 2019
Accepted: May 12, 2020
Published online: Aug 24, 2020
Published in print: Nov 1, 2020
Discussion open until: Jan 24, 2021
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