Mechanical Properties and Micromechanisms of SBS-Modified Asphalt Binder under Multiple Aging and Regeneration Effects
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 9
Abstract
The multiple regeneration of aging asphalt pavements has emerged as a pavement maintenance approach. However, the micromechanisms and performance deterioration patterns associated with multiple regenerations remain unclear. The present work aims to investigate the rheological and physicochemical properties of styrenic block copolymers (SBS)-modified asphalt during multiple recycling processes. The rheological properties, nanostructure, and functional group evolution of SBS-modified asphalt during multiple recyclings were evaluated using rotational viscosity, frequency scanning, multistress creep recovery (MSCR), atomic force microscopy (AFM), and Fourier transform infrared (FTIR) tests. The key findings demonstrated that the viscoelasticity of asphalt is affected by both SBS degradation and asphalt aging. During the initial aging phase, SBS degradation mainly affects the asphalt properties, whereas the subsequent aging process becomes the dominant factor. Moreover, the viscoelasticity of the asphalt binder is primarily influenced by aging rather than the SBS degradation. Importantly, the SBS-modified asphalt continues to meet specification requirements even after multiple recycling rounds, demonstrating the feasibility of aging SBS-modified asphalt binder through multiple regeneration techniques.
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Data Availability Statement
Some or all data or models that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors gratefully appreciate the supports from the National Natural Science Foundation of China (Grant No. 52108413), the Postdoctoral Science Foundation China (Grant Nos. 2021M702480 and 2022T150480), and Shanghai Housing and Urban-Rural Construction Management Commission (2023-002-051 and 2022-002-002).
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 9 • September 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Aug 24, 2023
Accepted: Feb 23, 2024
Published online: Jun 26, 2024
Published in print: Sep 1, 2024
Discussion open until: Nov 26, 2024
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