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Creep Recovery Behavior of Fresh, Aged, and Rejuvenated SBS-Modified Asphalt under High Shear Stresses
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DOI：10.1061/JMCEE7.MTENG-18865.png)
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Abstract
En 中文
The multiple stress creep recovery (MSCR) test is widely used to evaluate the rutting performance of asphalt binder. However, the results from current MSCR tests with maximum loading stress of 3.2 kPa are difficult to accurately estimate the rutting resistance of asphalt pavement in practice with high stress condition. To comprehensively study the changes in rutting potential of bitumen modified with styrene-butadiene-styrene (SBS-modified bitumen, or SMB) during aging and rejuvenation processes, the effects of different shear stresses and temperatures on the creep recovery behavior of fresh, aged, common, and reactive rejuvenated SMB were investigated. The results indicate that the effects of stress and temperature on the recovery rate and stress sensitivity of different binders vary considerably. The recovery rate and stress sensitivity of SMB are largely unaffected within a temperature range from 34 degrees C to 52 degrees C. However, aging prominently reduces the recovery rate and enhances stress sensitivity of SMB, and these effects would be exacerbated after common rejuvenation. In contrast, reactive rejuvenation mitigates these adverse impacts, particularly under conditions of elevated temperatures and stresses, making it more suitable for higher-level pavement applications. Additionally, the static creep recovery tests reveal that the SBS cross-linked structure supports the retention of creep recovery characteristics under high stress, where excessive stress (>= 12.8 kPa) compromises these properties. The recovery rate of aged SBS modified bitumen (ASMB) significantly declines after aging, and deteriorates further with common rejuvenation. Conversely, reactive rejuvenation not only boosts the recovery rate of ASMB, but also improves its delayed recovery ratio and reduces its stress sensitivity due to the reconstituted SBS cross-linked network. These findings provide a critical theoretical foundation for accurately assessing the rutting resistance of various recycled modified asphalt binders under diverse traffic loads and environmental conditions.
Keywords:
Aged SBS-modified bitumen
Reactive rejuvenation
Multiple stress creep recovery test
High shear stress
Creep recovery behavior
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