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<p>This study investigated the effect of thermal storage conditions on the performance stability of crumb rubber (CR) composite modified asphalt. Routine performance tests, rheological tests, segregation tests, and fluorescence microscopy tests were conducted on CR composite modified asphalt under different storage temperatures and durations. Fluorescence images were analyzed using image processing techniques, and the particle separation index (I<sub>SE</sub>) was introduced as a metric to assess storage stability. Quantitative relationships were established between I<sub>SE</sub>, softening point difference (SPD), and storage conditions. On this basis, a predictive method for safe storage duration and a zoning scheme for segregation evaluation were proposed. The results indicate that the penetration and viscosity of CR composite modified asphalt increase initially and then decrease with prolonged storage, whereas the softening point exhibits the opposite trend, while ductility and elastic recovery continuously decline. Optimal elastic response and rutting resistance are achieved under storage at 160&#xa0;°C. Fluorescence imaging reveals that the dispersion of polymers in asphalt undergoes distinct phases during storage. The I<sub>SE</sub> exhibits an exponential correlation with storage time and a linear relationship with temperature. When the SPD reaches 2.5&#xa0;°C, the critical I<sub>SE</sub> value is 1.5, corresponding to safe storage times of 59h, 52h, and 45h at 140&#xa0;°C, 160&#xa0;°C, and 180&#xa0;°C, respectively. Based on the SPD and I<sub>SE</sub>, storage states can be divided into qualified, warning, and degraded zones. This classification provides theoretical guidance for optimizing storage conditions while maintaining a balance between performance, cost, and sustainability.</p>

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Study on the thermal storage stability of crumb rubber composite modified asphalt

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Hui Wang,
  • Huiyun Wu,
  • Zhiwei Zeng,
  • Tao Chen,
  • Junwei Xiang,
  • Shuihui Wu,
  • Zhenghui Zhou,
  • Hui Xu

摘要

This study investigated the effect of thermal storage conditions on the performance stability of crumb rubber (CR) composite modified asphalt. Routine performance tests, rheological tests, segregation tests, and fluorescence microscopy tests were conducted on CR composite modified asphalt under different storage temperatures and durations. Fluorescence images were analyzed using image processing techniques, and the particle separation index (ISE) was introduced as a metric to assess storage stability. Quantitative relationships were established between ISE, softening point difference (SPD), and storage conditions. On this basis, a predictive method for safe storage duration and a zoning scheme for segregation evaluation were proposed. The results indicate that the penetration and viscosity of CR composite modified asphalt increase initially and then decrease with prolonged storage, whereas the softening point exhibits the opposite trend, while ductility and elastic recovery continuously decline. Optimal elastic response and rutting resistance are achieved under storage at 160 °C. Fluorescence imaging reveals that the dispersion of polymers in asphalt undergoes distinct phases during storage. The ISE exhibits an exponential correlation with storage time and a linear relationship with temperature. When the SPD reaches 2.5 °C, the critical ISE value is 1.5, corresponding to safe storage times of 59h, 52h, and 45h at 140 °C, 160 °C, and 180 °C, respectively. Based on the SPD and ISE, storage states can be divided into qualified, warning, and degraded zones. This classification provides theoretical guidance for optimizing storage conditions while maintaining a balance between performance, cost, and sustainability.