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<p>Using BASF commercial polyurethane 1185&#xa0;A (TPU) as the modifying material, polyurethane-modified asphalt in varying dosages was created for this study. The rheological properties, fatigue behavior, temperature sensitivity, chemical composition, and self-healing properties of polyurethane-modified asphalt were all characterized using multi-dimensional characterization techniques, such as the dynamic shear rheometer test (DSR), bending creep stiffness test (BBR), fatigue-healing-fatigue test, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The findings of the study indicated that adding TPU to asphalt can optimize its low-temperature performance, effectively increase its low-temperature flexibility, and greatly increase its resistance to low-temperature cracking. Excellent interfacial adhesion between the modifier and the base asphalt was found by microscopic morphological investigation. According to the results of the fatigue-healing-fatigue tests, the modified asphalt’s self-healing performance progressively improved as the TPU content rose, peaking at 6% TPU content. When the TPU concentration is 6%, the changed asphalt achieves the best overall modification effect, according to a thorough investigation of all performance metrics. This study’s findings offer a theoretical foundation for enhancing matrix asphalt’s rheological characteristics and self-healing capabilities while also prolonging the pavement’s service life.</p>

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Preparation and performance study of commercial polyurethane-modified asphalt

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Xiaoxuan Shen,
  • Longhai Chen,
  • Yichang Ma,
  • Ziyi Li,
  • Bo Liang,
  • Yue-Fei Zhang

摘要

Using BASF commercial polyurethane 1185 A (TPU) as the modifying material, polyurethane-modified asphalt in varying dosages was created for this study. The rheological properties, fatigue behavior, temperature sensitivity, chemical composition, and self-healing properties of polyurethane-modified asphalt were all characterized using multi-dimensional characterization techniques, such as the dynamic shear rheometer test (DSR), bending creep stiffness test (BBR), fatigue-healing-fatigue test, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The findings of the study indicated that adding TPU to asphalt can optimize its low-temperature performance, effectively increase its low-temperature flexibility, and greatly increase its resistance to low-temperature cracking. Excellent interfacial adhesion between the modifier and the base asphalt was found by microscopic morphological investigation. According to the results of the fatigue-healing-fatigue tests, the modified asphalt’s self-healing performance progressively improved as the TPU content rose, peaking at 6% TPU content. When the TPU concentration is 6%, the changed asphalt achieves the best overall modification effect, according to a thorough investigation of all performance metrics. This study’s findings offer a theoretical foundation for enhancing matrix asphalt’s rheological characteristics and self-healing capabilities while also prolonging the pavement’s service life.