Nanomaterials for asphalt modification and incorporating nanoparticles into asphalt mixtures to deal with road failure have gained popularity recently. Researchers have reported the improved performance of asphalt modified by carbon nanotubes (CNTs), but the cost is very high with the relatively high CNTs content. This work studied the composites modification for asphalt by CNTs and polymer with a relatively low dosage. Combined adding CNTs and polyethylene (PE), and pre-melting-mixed CNTs/PE composites were selected for preparation of modified asphalt in the study. The rheological properties as well as anti-aging performance were investigated using dynamic oscillation shearing, steady state shearing, MSCR, Fourier transform infrared (FT-IR) spectroscopy and Scanning Electron Microscopy (SEM). The influence of CNTs/PE composites on viscoelasticity as well as anti-aging performance was illustrated. The results indicated that CNTs and PE have synergistic effect on improving the high temperature performance of asphalt binders (verified by increased modulus, higher viscosity, etc.), indicating improvement on rutting resistance. Premixed CNTs/PE composites benefits for the low temperature cracking resistance and has the good anti-aging performance. No new absorption peaks appeared in FT-IR spectrum of CNTs/PE modified asphalt after aging, whereas a number of micro-cracks occurred in the SEM of aged asphalt with CNTs & PE. Microstructure evaluation indicated that premixed CNTs/PE composites can delay the aging degree of asphalt.

近年来，用于沥青改性的纳米材料以及将纳米颗粒掺入沥青混合物中以应对道路故障的纳米材料已广受欢迎。研究人员已经报告了碳纳米管（CNTs）改性沥青的性能改善，但是由于CNTs含量相对较高，成本很高。这项工作研究了碳纳米管和较低剂量的聚合物对沥青复合材料的改性。结合添加碳纳米管和聚乙烯（PE），选择预熔混合的碳纳米管/聚乙烯复合材料制备改性沥青。使用动态振荡剪切，稳态剪切，MSCR，傅立叶变换红外（FT-IR）光谱和扫描电子显微镜（SEM）研究了流变性能和抗老化性能。说明了碳纳米管/聚乙烯复合材料对粘弹性和抗老化性能的影响。结果表明，CNT和PE具有改善沥青粘合剂高温性能的协同作用（通过增加模量，更高的粘度等进行验证），表明耐车辙性得到改善。预混的CNTs / PE复合材料具有良好的抗低温开裂性，并具有良好的抗老化性能。老化后的CNTs / PE改性沥青的FT-IR光谱中未出现新的吸收峰，而CNTs和PE老化的沥青的SEM中出现了许多微裂纹。显微组织评估表明，预混合的CNTs / PE复合材料可以延迟沥青的老化程度。结果表明，CNT和PE具有改善沥青粘合剂高温性能的协同作用（通过增加模量，更高的粘度等进行验证），表明耐车辙性得到改善。预混的CNTs / PE复合材料具有良好的抗低温开裂性，并具有良好的抗老化性能。老化后的CNTs / PE改性沥青的FT-IR光谱中未出现新的吸收峰，而CNTs和PE老化的沥青的SEM中出现了许多微裂纹。显微组织评估表明，预混合的CNTs / PE复合材料可以延迟沥青的老化程度。结果表明，CNT和PE具有改善沥青粘合剂高温性能的协同作用（通过增加模量，更高的粘度等进行验证），表明耐车辙性得到改善。预混的CNTs / PE复合材料具有良好的抗低温开裂性，并具有良好的抗老化性能。老化后的CNTs / PE改性沥青的FT-IR光谱中未出现新的吸收峰，而CNTs和PE老化的沥青的SEM中出现了许多微裂纹。显微组织评估表明，预混合的CNTs / PE复合材料可以延迟沥青的老化程度。预混的CNTs / PE复合材料具有良好的抗低温开裂性，并具有良好的抗老化性能。老化后的CNTs / PE改性沥青的FT-IR光谱中未出现新的吸收峰，而使用CNTs和PE的老化沥青的SEM中出现了许多微裂纹。显微组织评估表明，预混合的CNTs / PE复合材料可以延迟沥青的老化程度。预混的CNTs / PE复合材料具有良好的抗低温开裂性，并具有良好的抗老化性能。老化后的CNTs / PE改性沥青的FT-IR光谱中未出现新的吸收峰，而CNTs和PE老化的沥青的SEM中出现了许多微裂纹。显微组织评估表明，预混合的CNTs / PE复合材料可以延迟沥青的老化程度。