Quantifying Weathering-Aging Test Parameters of High Viscosity–Modified Asphalt by Establishing a Conversion Relationship with Standard PAV Aging
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 6
Abstract
The purpose of this study was to quantify the weathering-aging degree by establishing a conversion relationship with standard pressure-aging vessel (PAV) aging, thus guiding the selection of environmental parameters in the weathering-aging test. First, the orthogonal test was used to determine the most severe weathering-aging combination. Then the rheological property and chemical composition of high viscosity–modified asphalt (HVMA) after weathering-aging and standard PAV aging were investigated by dynamic shear rheometer (DSR), multiple stress creep recovery (MSCR), Fourier transform infrared spectroscopy (FTIR), and gel permeation chromatography (GPC) tests. Afterward, the radar figure was used to establish the conversion relationship between weathering aging and standard PAV aging. The results show that the most severe weathering-aging condition combination is 70°C, , and 70% relative humidity (RH). The molecules from the polymer, asphaltene, and maltene phase exhibit dynamic migration processes of molecular weight during aging, thus leading to the transition from a viscous component to an elastic component in HVMA. Compared with PAV aging, HVMA has more significant chemical changes during weathering aging due to the coupling effect of solar radiation and heat. Most of the performance changes of HVMA are similar in weathering aging and standard PAV aging except for functional groups and . The 4 days of weathering aging at 70°C, , and 70% RH shows the best accordance to the standard PAV aging.
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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 National Natural Science Foundation of China (Grant Nos. 52178434 and 51878500).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 6 • June 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Apr 10, 2021
Accepted: Oct 1, 2021
Published online: Mar 18, 2022
Published in print: Jun 1, 2022
Discussion open until: Aug 18, 2022
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