【摘要】 为了得到一种兼顾高低温性能且环境友好的复合改性沥青，研究选用Sasobit与SBR两种材料作为改性剂，制备得到一种高低温性能兼顾的复合改性沥青。通过对不同掺配比例（Sasobit掺量为0%、1%、2%、3%、4%;SBR掺量为0%、3%、4%、5%、6%）复合改性沥青老化前后的流变性能进行研究，确定了Sasobit/SBR复合改性沥青的最佳掺配比例，利用红外光谱实验研究复合改性沥青的改性机理，并利用荧光显微镜观察改性剂在沥青中的分散情况。研究结果表明：Sasobit的加入会提高沥青的高温流变性能，降低沥青的低温性能；SBR的加入会提高沥青的低温流变性能，对高温流变性能的提升不明显。在兼顾经济性的情况下，复合改性沥青的最佳掺配比例为3%Sasobit+5%SBR。红外光谱分析表明，复合改性沥青的改性机理为物理改性，两种改性剂在沥青中分布均匀，有交联结构产生。更多还原

【Abstract】 To develop a composite modified asphalt that balances high and low-temperature performance while being environmentally friendly, this study selected Sasobit and SBR as modifi ers to prepare a composite modifi ed asphalt with good high and low-temperature properties. The rheological properties of the composite modifi ed asphalt before and after aging with dif ferent mixing ratios(Sasobit content of 0%, 1%, 2%, 3%, 4%; SBR content of 0%, 3%, 4%, 5%, 6%) were studied to determine the optimal mixing ratio of Sasobit/SBR composite modifi ed asphalt. The modifi cation mechanism of composite modifi ed asphalt was investigated using infrared spectroscopy, and the dispersion of modifi ers in asphalt was observed using fl uorescence microscopy.The results show that the addition of Sasobit improves the high-temperature rheological performance of asphalt and reduces its lowtemperature rheological performance; the addition of SBR improves the low-temperature rheological performance of asphalt but has no signifi cant ef fect on high-temperature rheological performance. Considering cost-ef fectiveness, the optimal mixing ratio for the composite modifi ed asphalt is 3% Sasobit + 5% SBR. The study of the modifi cation mechanism using infrared spectroscopy indicates that the modifi cation mechanism of composite modifi ed asphalt is physical modifi cation, with both modifi ers evenly distributed in the asphalt and cross-linking structures formed.更多还原