纳米复合ZnO改性沥青混合料路用性能分析

Road Performance Analysis of Nano-composite ZnO Modified Asphalt Mixtures

为分析纳米ZnO材料在改性沥青方面的应用效果,验证其沥青混合料的综合路用性能,文章通过制定相应的纳米ZnO改性沥青、纳米复合ZnO/SBS改性沥青的试验方案,利用车辙试验、SPT简单剪切试验、小梁弯曲试验和冻融劈裂试验等分析四种不同类型沥青混合料的路用性能。结果显示:纳米ZnO材料显著改善了70#基质沥青的高温抗车辙性能、低温抗裂性能和水稳定性能,其中采用复合ZnO/SBS改性的沥青混合料综合路用性能最佳,远超出规范要求标准;纳米复合ZnO改性沥青混合料与70^#基质沥青相比动稳定度和动态模量值分别提高了约114.1%和233%,最大破坏弯曲应变和残留稳定度分别提高了35.7%和14.5%。汇总可知,采用纳米ZnO改性方法能够有效解决目前沥青路面所面临的早期病害问题,为沥青混合料改性技术的应用提供技术支持,对延长路面使用寿命具有重要意义。

In order to analyze the application effect of nano-ZnO materials in modified asphalt and verify the comprehensive road performance of its asphalt mixture,by developing the corresponding experiment scheme of nano-ZnO modified asphalt and nanocomposite ZnO/SBS modified asphalt,and through the rutting test,SPT simple shear test,trabecular bending test and freeze-thaw splitting test,this article analyzes the road performance of four different types of asphalt mixtures.The results show that the nano-ZnO material significantly improves the high-temperature rutting resistance,low-temperature crack resistance and water stability of 70^# matrix asphalt,wherein the composite ZnO/SBS modified asphalt mixture has the best comprehensive road performance,far exceeding the specification requirement standard;the dynamic stability and dynamic modulus values of nanocomposite ZnO modified asphalt mixture are increased by about 114.1% and 233% respectively compared to 70^# matrix asphalt,and the maximum failure bending strain and residual stability are increased by 35.7% and 14.5% respectively.It can be seen that the nano-ZnO modification method can effectively solve the early disease problems faced by asphalt pavement at present,which provides the technical support for the application of asphalt mixture modification technology and is of great significance for extending the service life of pavement.