Abstract: The modified asphalt was prepared by compound mixing of nano-montmorillonite and SBS, which could improve the comprehensive performance of the modified asphalt and its asphalt mixture. The nano-montmorillonite and SBS modifiers with different dosages were selected for re-doping, and the softening point, penetration, ductility, rotational viscosity and dynamic shear rheological tests were used to evaluate the performance of the modified asphalt. The influence of nano-montmorillonite content on the performance of modified asphalt was explored. The research results show that the ductility of asphalt is greatly affected by the amount of nano-montmorillonite. When the amount of nano-montmorillonite is 3%, the rutting factor of the compound modified asphalt is 1.26 times higher than that of the ordinary SBS modified asphalt; the fatigue factor is 0.68 times lower than that of the ordinary SBS modified asphalt; thus, the performance of compound modified asphalt is the best.

Key words: road engineering, nano-montmorillonite, modified asphalt, performance index, dynamic shear rheology: influence law

摘要： 将纳米蒙脱石和SBS进行复掺制备改性沥青，可提升改性沥青及其沥青混合料的综合性能。选取不同掺量的纳米蒙脱石与SBS改性剂进行复掺，采用软化点、针入度、延度、旋转黏度、动态剪切流变试验对复掺改性沥青的性能进行综合评价，探究纳米蒙脱石掺量对改性沥青性能的影响规律。研究结果表明：沥青的延度受纳米蒙脱石掺量的影响幅度较大，纳米蒙脱石掺量在3%时，复掺改性沥青的车辙因子较普通SBS改性沥青提升1.26倍，疲劳因子较普通SBS改性沥青下降0.68倍，复掺改性沥青的性能达到最佳。

关键词: 道路工程, 纳米蒙脱石, 改性沥青, 性能指标, 动态剪切流变：影响规律