A Comprehensive Analysis of Fatigue and Healing Capacity of Sasobit Polymer-Modified Asphalt from Two Perspectives: Binder and FAM
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 3
Abstract
Wax-based Sasobit synthetic hard wax can be designed for producing asphalt with less energy consumption and lower carbon emissions in the pavement industry. This study investigated the effectiveness of Sasobit synthetic hard wax on microscopic properties, fatigue-fracture behavior, and healing potential of polymer-modified asphalt (PMA) from two perspectives: asphalt binder and fine aggregate matrix (FAM). First, microscopic morphology, dispersion mechanism, and thermal stability of styrene-butadiene-styrene (SBS)– and crumb rubber (CR)–modified asphalt binders under the influence of Sasobit synthetic hard wax were characterized. Second, linear viscoelastic properties and evolution law of fatigue life of Sasobit synthetic hard wax/polymer-modified asphalt binders and FAM with and without healing interval were assessed under the framework of the simplified viscoelastic continuum damage (S-VECD) model. Third, the correlation between properties of the modified asphalt binder and FAM was statistically analyzed by radar chart. Thermodynamic analysis indicated that Sasobit synthetic hard wax enhanced the thermal stability of PMA but slightly reduced the low-temperature performance. Morphological observations showed that Sasobit synthetic hard wax had limited effectiveness on the dispersion of the polymer particles in PMA. Dynamic modulus master curves and fatigue and healing tests demonstrated that Sasobit synthetic hard wax contributes to the stiffness, fatigue resistance, and self-healing capability of the asphalt binder and mixture. Finally, statistical analysis revealed that the asphalt binder performance lacked a close correlation with the FAM owing to the complex composition system.
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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 financial supports from the project funded by China Postdoctoral Science Foundation (Grant No. 2021M692918), the Natural Science Foundation of Henan (Grant No. 222300420308), the Key Scientific and Technological Project of Henan Province (Grant No. 212102310937), and the Science and Technology Project of Henan Provincial Department of Transportation (2021-2-13) were greatly appreciated.
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Journal of Materials in Civil Engineering
Volume 35 • Issue 3 • March 2023
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© 2022 American Society of Civil Engineers.
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Received: Feb 1, 2022
Accepted: Jul 1, 2022
Published online: Dec 28, 2022
Published in print: Mar 1, 2023
Discussion open until: May 28, 2023
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