Evaluation of High-Temperature Creep Deformation Properties of Warm-Mix Recycled Asphalt Mixture Based on Improved Flow Number
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 10
Abstract
To calculate a more accurate flow number () to evaluate the effects of temperature, long-term aging, and salt freeze-thaw cycles on the high-temperature creep deformation characteristics of warm-mix recycled asphalt mixture (WRAM). This paper uses WRAM with different recycled asphalt pavement (RAP) old material contents (0%, 30%, 50%, and 70%) as the research object. The shortcomings of the cut line minimum method were analyzed, and based on this, a two-step slope of the cut line minimum method based on different interval coefficients (P) was proposed. In addition, this method was also compared with the four common methods. The results show that all five methods can solve the accurately, but the two-step slope of the cut line minimum method is better than the four common methods. When the P value is 0.99, 0.97, and 0.95, the method can find the accurate and unique , which is easy to operate and practical. According to the high-temperature evaluation indexes (creep rate and improved ), temperature and salt freeze-thaw cycles reduce the high-temperature creep deformation resistance of WRAM, while long-term aging will promote the high-temperature creep deformation resistance ability. Compared with traditional hot-mix asphalt mixture (HAM), WRAM is more excellent in high-temperature creep deformation resistance, aging resistance, and salt freeze-thaw cycles damage resistance.
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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 paper was financially supported by the Basic Scientific Research Expenses Program of Universities directly under the Inner Mongolia Autonomous Region (JY20220005) and Science and Technology Project of Inner Mongolia Autonomous Region (No. 2020GG0263).
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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 25, 2022
Accepted: Mar 23, 2023
Published online: Jul 31, 2023
Published in print: Oct 1, 2023
Discussion open until: Dec 31, 2023
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