【摘要】 为进一步提升改性沥青的使用性能和流变性能，文中件采用PU预聚体、SBS改性剂制备PU-SBS复合改性沥青。采用针入度试验、软化点试验、延度试验评价PU-SBS复合改性沥青的基本物理性能，采用温度扫描试验、频率扫描试验评价PU-SBS复合改性沥青的流变特性，并构建主曲线评价其在更宽的温域及频域范围的流变特性。结果表明，PU-SBS复合改性沥青表现出良好的物理性能和流变特性。SBS、PU在基质沥青中形成空间网络结构，阻碍了沥青的流动，从而显著提高了复合改性沥青的高温性能。同时PU-SBS复合改性能够降低沥青在高频范围内的劲度，改善沥青的低温抗开裂性能。更多还原

【Abstract】 To further enhance the performance and rheological properties of modified asphalt,PU prepolymers and SBS modifiers were adopted to prepare PU-SBS composite modified asphalt in this research.The basic physical performance of PU-SBS composite modified asphalt were evaluated including penetration tests,softening point tests,and ductility tests.The rheological properties were studied by temperature scanning tests and frequency scanning tests,and the master curve was constructed to evaluate the rheological properties over a broader temperature and frequency range.The results indicate that PU-SBS composite modified asphalt exhibits excellent physical performance and rheological properties.SBS and PU form a spatial network structure in the base asphalt,obstructing asphalt flow and significantly improving the high-temperature performance of the composite modified asphalt.Additionally,PU-SBS composite modification reduces the stiffness of asphalt in the high-frequency range,enhancing its low-temperature crack resistance.更多还原