【摘要】 利用熔融插层方式制备了不同种类及掺量的纳米材料改性沥青,通过沥青基本物理性能的比较筛选出有机膨润土并基于Superpave沥青胶结料评价方法分析了沥青基纳米复合材料的路用性能,通过XRD、FTIR表征了纳米复合材料的作用机理。结果表明:膨润土使伦特70#、盘锦90#沥青的性能均得到改善,且有机膨润土的基础物理性能都高于无机膨润土;有机膨润土提高了沥青的高温性能和耐老化性能,但对低温性能有负面影响。表现为复数剪切模量增加,相位角降低。粘度老化指数和复数剪切模量比降低。蠕变劲度模量增加,m值降低;有机膨润土晶体结构的层间距和分子特征峰强度随掺量的增加呈先增强后减弱的趋势;由应用性能及作用机理得到有机膨润土的最佳掺量为4%。更多还原

【Abstract】 Different types and amounts of nanomaterial modified asphalt were prepared by melt intercalation. The organic bentonite was selected through comparison of basic physical properties and the road performance of the asphalt-based nanocomposites was analyzed based on Superpave asphalt binder evaluation method. And the mechanism of nanocomposites was characterized by X-ray diffraction and infrared spectroscopy. The results show that the performance of Lent 70# and Panjin 90# matrix asphalt is improved by Bentonite,and the basic physical properties of organic bentonite are higher than that of inorganic bentonite. Organic bentonite improves the high-temperature stability and aging resistance of asphalt,and its low-temperature properties have decreased,it appears that the complex shear modulus increases and the phase angle decreases. The viscosity aging index and the complex shear modulus ratio are reduced. Creep stiffness modulus increases,the value of m decreases. The interlamellar spacing and molecular characteristic peak intensity of the organic bentonite crystal structure increase first and then decrease with the increase of the content of the organic bentonite. The optimum blending amount of organic bentonite is 4% from the application performance and mechanism of action.更多还原