Method for Evaluating Compatibility between SBS Modifier and Asphalt Matrix Using Molecular Dynamics Models
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 8
Abstract
To further evaluate the compatibility between asphalt matrix and styrene-butadiene-styrene (SBS) modifier using a molecular dynamics (MD) method, MD models of asphalt matrix, SBS modifier, and SBS-modified asphalt were first established. Solubility parameters and interaction energy were utilized to discuss the compatibility between asphalt matrix and SBS modifier. The simulated results indicate that asphalt is compatible with SBS modifier, and the compatibility at 160°C is much better than that at 120°C. The interaction between SBS modifier and asphalt matrix increases their compatibility, and the van der Waals potential energy predominates in the intermolecular potential energy, playing an important role in forming a stable blending system of SBS-modified asphalt. Further, interactions among asphalt components and SBS modifier cannot inhibit the molecular diffusion of each component, lowering the compatibility between asphalt and SBS modifier at 120°C. However, the higher temperature at 160°C inhibits SBS diffusion and increases the interaction and compatibility between SBS and asphalt. This study reveals the segregation mechanism of SBS-modified asphalt.
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (51978340), Provincial Six Talent Peaks Project in Jiangsu (JNHB-050), and Jiangsu Provincial Department of Education for the Qing Lan Project. Also we would like to thank Advanced Analysis & Testing Center of Nanjing Forestry University for assistance with the experiments.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 8 • August 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Nov 20, 2020
Accepted: Jan 25, 2021
Published online: Jun 11, 2021
Published in print: Aug 1, 2021
Discussion open until: Nov 11, 2021
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