Comparative Investigation of the Rheological Properties and Rejuvenation Mechanism of Rejuvenated SBS Modified Asphalt Binder After Ultraviolet Aging
Fucheng Guo, Xu He, Pengfei Zhi, Hongmei Ma, Hui Dou, Bo Li
TL;DR
This study compares two rejuvenators to restore UV-aged SBS modified asphalt binder, finding one more effective at restoring performance.
Contribution
The paper introduces two new rejuvenators and evaluates their effectiveness in restoring UV-aged asphalt binder properties.
Findings
UV aging significantly deteriorates high- and low-temperature performance of SBS modified asphalt binder.
Rejuvenator B outperforms Rejuvenator A in restoring chemical properties and reducing large molecular size.
Both rejuvenators restore low-temperature performance, but with different stiffness and m-value recovery effects.
Abstract
This study aims to investigate the restorative effects and rejuvenation mechanisms of two rejuvenators on ultraviolet (UV)-aged SBS modified asphalt binder. Two types of rejuvenators were developed. The rheological properties of aged and rejuvenated asphalt were systematically evaluated using a dynamic shear rheometer (DSR), bending beam rheometer (BBR), and multiple stress creep and recovery (MSCR) tests. Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC) were employed to analyze the rejuvenation mechanisms. The results demonstrate that UV aging significantly deteriorates both the high- and low-temperature performance of SBS modified asphalt binder. Oil-rich rejuvenator A effectively restores UV-aged asphalt’s high-temperature performance and low-temperature stiffness. Polymer-based rejuvenator B better repairs PAV-aged cross-linked networks with…
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Taxonomy
TopicsAsphalt Pavement Performance Evaluation · Infrastructure Maintenance and Monitoring · Petroleum Processing and Analysis