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<p>Elastomer-modified asphalt, as a key material for enhancing the high-temperature rutting resistance and fatigue performance of pavements, has long been limited in performance optimization by the empirical selection of traditional process parameters and the ambiguity of micro-mechanisms. Therefore, this study investigates the processing parameters of various modification processes and determines the optimal preparation process for polyurethane-modified asphalt based on orthogonal experimental methods. On the basis of the proposed optimal preparation process, a comprehensive evaluation of the quality of the prepared polyurethane-modified asphalt is conducted under different concentrations of the modifier. Furthermore, the compatibility of the elastomeric modifiers with asphalt under optimal preparation conditions was also evaluated. Thermal analysis techniques, including Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA) were employed to investigate the variations in thermal and physical properties of elastomer-treated asphalt. To establish a multi-scale quality assessment system for polyurea-modified asphalt preparation, molecular dynamics simulation was employed to comprehensively investigate the interaction mechanisms between Polyurea (PUA) modifiers and the asphalt matrix. The analysis showed that the most effective parameters for high-speed shear mixing in the preparation process of elastomer-treated asphalt were 150&#xa0;°C, 6000&#xa0;rpm, and 40&#xa0;min. Incorporating PUA modifier demonstrated notable enhancement in the asphalt binder’s softening characteristics, albeit with observable diminishment in both ductility performance and penetration metrics. Incorporating the PUA modifier enhanced the rutting factor of the bituminous composites, while effectively reducing phase angle, and enhancing both rheological and elastic restitution capacity properties, with greater improvements observed at higher dosages. However, the PUA modifier demonstrated dosage-dependent enhancement characteristics, achieving profound augmentation in thermal stabilization and pyrolysis efficiency within bituminous composites, albeit with moderate interfacial compatibility variation. Molecular dynamics simulation&#xa0;utilized for&#xa0;optimizing and validating the modeling of PUA-modified asphalt, revealing at the molecular scale the mechanisms behind performance variations observed in macroscopic tests, thereby enabling multi-scale comprehensive evaluation of modified asphalt preparation quality.</p>

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Optimization of Preparation Technology and Quality Assessment of Polyurea (PUA) Modified Asphalt

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Xiaolong Sun,
  • Yuqian Zhang,
  • Zhisheng Liu,
  • Xiao Qin,
  • Hualong Xu

摘要

Elastomer-modified asphalt, as a key material for enhancing the high-temperature rutting resistance and fatigue performance of pavements, has long been limited in performance optimization by the empirical selection of traditional process parameters and the ambiguity of micro-mechanisms. Therefore, this study investigates the processing parameters of various modification processes and determines the optimal preparation process for polyurethane-modified asphalt based on orthogonal experimental methods. On the basis of the proposed optimal preparation process, a comprehensive evaluation of the quality of the prepared polyurethane-modified asphalt is conducted under different concentrations of the modifier. Furthermore, the compatibility of the elastomeric modifiers with asphalt under optimal preparation conditions was also evaluated. Thermal analysis techniques, including Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA) were employed to investigate the variations in thermal and physical properties of elastomer-treated asphalt. To establish a multi-scale quality assessment system for polyurea-modified asphalt preparation, molecular dynamics simulation was employed to comprehensively investigate the interaction mechanisms between Polyurea (PUA) modifiers and the asphalt matrix. The analysis showed that the most effective parameters for high-speed shear mixing in the preparation process of elastomer-treated asphalt were 150 °C, 6000 rpm, and 40 min. Incorporating PUA modifier demonstrated notable enhancement in the asphalt binder’s softening characteristics, albeit with observable diminishment in both ductility performance and penetration metrics. Incorporating the PUA modifier enhanced the rutting factor of the bituminous composites, while effectively reducing phase angle, and enhancing both rheological and elastic restitution capacity properties, with greater improvements observed at higher dosages. However, the PUA modifier demonstrated dosage-dependent enhancement characteristics, achieving profound augmentation in thermal stabilization and pyrolysis efficiency within bituminous composites, albeit with moderate interfacial compatibility variation. Molecular dynamics simulation utilized for optimizing and validating the modeling of PUA-modified asphalt, revealing at the molecular scale the mechanisms behind performance variations observed in macroscopic tests, thereby enabling multi-scale comprehensive evaluation of modified asphalt preparation quality.