Aging Resistance Evaluation of Asphalt Modified by BRA/NA/AA Composite Modified Asphalt Based on the Rheological and Microscopic Analysis

Gao, Yingli; Long, Guoxin; Xiang, Shuncheng; Shi, Ke; Bu, Tao

doi:10.1061/(asce)mt.1943-5533.0004617

Cited by 5 publications

(2 citation statements)

References 31 publications

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“…Asphalt aging can weaken its low-temperature crack resistance and fatigue resistance. [30][31][32] Therefore, it is necessary to consider the changes of performance indicators in different temperature ranges when evaluating the aging resistance of asphalt binder. The special changes in rheological index and chemical composition of polymer modified asphalt increase the difficulty in evaluating the antiaging ability.…”

Section: Introductionmentioning

confidence: 99%

“…Asphalt pavement needs to withstand fatigue loads in a wide temperature range, which has more stringent requirements for the high‐ and low‐temperature performance of asphalt binder. Asphalt aging can weaken its low‐temperature crack resistance and fatigue resistance 30–32 . Therefore, it is necessary to consider the changes of performance indicators in different temperature ranges when evaluating the aging resistance of asphalt binder.…”

Section: Introductionmentioning

confidence: 99%

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Rheological properties and aging resistance of self‐healing polyurea elastomer modified asphalt

Li,

Zhang,

et al. 2024

Polymer Engineering & Sci

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Polymer modified asphalt containing dynamic chemical bonds has the potential to increase the service life of asphalt pavement due to its excellent self‐healing ability. The effect of this self‐healing accelerator with dynamic chemical bond on the rheological properties and aging resistance of asphalt binder is still unclear. In this study, a self‐healing polyurea elastomer (PUA) modified asphalt containing dynamic disulfide bonds was prepared. The high‐ and low‐temperature performance and fatigue resistance of PUA modified asphalt were studied through multiple stress creep, low‐temperature bending beam rheometer, mechanical glass transition temperature, and linear amplitude scanning tests. Moreover, considering the service environment of asphalt over a wide temperature range (−30–70°C), three rheological aging indices (RAI) were proposed. At the same time, the aging resistance of PUA modified asphalt was evaluated by chemical aging index (CAI) based on carbonyl and sulfoxide groups. Finally, a linear relationship is established between RAI and CAI over a wide temperature range. The experimental results show that self‐healing accelerators can increase the resistance to permanent deformation of asphalt by 47.41% and the fatigue resistance by 88.54%. The S value of PUA modified asphalt decreased by at most 33.21% and the m value increased by at most 35.23% compared with BA at −18°C. Moreover, PUA can improve the long‐term thermal oxygen aging resistance of asphalt binders by at least 38.33% over a wide temperature range.Highlights Rheological properties of self‐healing polyurea elastomer modified asphalt. Aging resistance of self‐healing polyurea elastomer modified asphalt. Proposed rheological aging indices for different temperature ranges. Clarified the correlation between chemical–rheological aging indices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%