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<p>High-content crumb rubber composite-modified asphalt (HRCA) offers superior fatigue resistance while mitigating waste tire pollution. To accelerate its adoption in high-grade highways, this study systematically investigates the modification mechanisms and rheological performance of HRCA with varying rubber contents (20-50 wt.%) and fixed 2 wt.% SBS. Microstructural characterization was performed using Fourier transform infrared spectroscopy (FTIR) and fluorescence microscopy (FM). Rheological properties were evaluated via multiple stress creep recovery (MSCR) and frequency sweep (FS) tests. Results show that HRCA forms a uniform and stable structure through combined physical and chemical interactions. Mechanical responses vary with loading frequency and temperature. HRCA exhibits strong resistance to permanent deformation, ranked as HRCA@30% &gt; HRCA@40% &gt; HRCA@50% &gt; HRCA@20%. The microscopic analysis confirms that rubber particles are mainly physically dispersed, with SBS dominating chemical modification. Moderate rubber contents (30-40 wt.%) promote well-developed three-dimensional networks, while excessive or insufficient rubber causes phase separation. This multiscale characterization provides fundamental insights into structure–property relationships, supporting the design of sustainable, high-performance asphalt pavements.</p>

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Study on the Microscopic Characteristics and Viscoelastic Behavior of Asphalt Modified with High-Content Rubber Powder and SBS at Different Dosages

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Ze Zhang,
  • Ziyu Bai,
  • Mingming Zhang

摘要

High-content crumb rubber composite-modified asphalt (HRCA) offers superior fatigue resistance while mitigating waste tire pollution. To accelerate its adoption in high-grade highways, this study systematically investigates the modification mechanisms and rheological performance of HRCA with varying rubber contents (20-50 wt.%) and fixed 2 wt.% SBS. Microstructural characterization was performed using Fourier transform infrared spectroscopy (FTIR) and fluorescence microscopy (FM). Rheological properties were evaluated via multiple stress creep recovery (MSCR) and frequency sweep (FS) tests. Results show that HRCA forms a uniform and stable structure through combined physical and chemical interactions. Mechanical responses vary with loading frequency and temperature. HRCA exhibits strong resistance to permanent deformation, ranked as HRCA@30% > HRCA@40% > HRCA@50% > HRCA@20%. The microscopic analysis confirms that rubber particles are mainly physically dispersed, with SBS dominating chemical modification. Moderate rubber contents (30-40 wt.%) promote well-developed three-dimensional networks, while excessive or insufficient rubber causes phase separation. This multiscale characterization provides fundamental insights into structure–property relationships, supporting the design of sustainable, high-performance asphalt pavements.