基于正交试验的纳米ZnO/SEBS复合改性沥青性能

为使改性沥青混合料具有良好的性能，能够在一些极端环境下正常使用，选择纳米ZnO和（苯乙烯-乙烯-丁二烯-苯乙烯）SEBS两类改性剂复合对70号沥青进行改性。利用正交试验对复合改性沥青的制备方案进行优化，并通过布氏旋转黏度、针入度、延度、软化点和高低温流变等实验，对纳米ZnO、SEBS、纳米ZnO/SEBS改性沥青以及基质沥青的粘滞性、温度敏感性、高低温流变性能以及PG连续分级进行比较分析，以此确定最优配方。试验结果表明，纳米ZnO/SEBS复合改性沥青最优制备改性剂掺量为3%纳米ZnO+5%SEBS，最优制备方案为先加SEBS后加纳米ZnO；此掺量复合改性沥青的温度敏感性显著降低，低温抗裂性能以及PG连续分级的高低温服务温度范围均有明显改善，对沥青高温性能提升最为显著。

Research on Performance of Nano-ZnO/SEBS Composite Modified Asphalt Based on Orthogonal Test

In order to make the modified asphalt mixture have good performance and can be used normally in some extreme environments, nano-zno and (styrene-ethylene-butadiene-styrene) SEBS were selected to modify asphalt 70. Using orthogonal experiment optimization scheme of compound preparation of modified asphalt, and through the brinell rotary viscosity, penetration, ductility, softening point and high and low temperature rheological experiments, such as the nano ZnO, SEBS, nano ZnO/SEBS modified asphalt and the matrix asphalt viscosity, temperature sensitivity, high and low temperature rheological properties and PG continuous classification comparative analysis, To determine the optimal formula. The results show that the optimal modifier content of nano-zno /SEBS composite modified asphalt is 3% nano-zno +5%SEBS, and the optimal preparation scheme is to add SEBS first and then ganagzno. The temperature sensitivity, crack resistance at low temperature and service temperature range at high and low temperature of PG continuous grading were significantly improved, and the high temperature performance of asphalt was significantly improved.