硅灰改性沥青老化性能研究

发布时间：2018-11-27 17:13

【摘要】：为了研究硅灰改性沥青的抗老化性能，本文采用对比的方法，以抗老化性能较好的多聚磷酸为参照，在基质沥青中分别掺入一定量的硅灰、多聚磷酸，制得硅灰、多聚磷酸改性沥青，通过旋转薄膜烘箱对沥青进行短期老化试验来模拟沥青的老化过程，研究了老化前后的基质沥青及改性沥青的基本物理性能和流变性能的变化，并利用红外光谱分析和电镜扫描，分析了老化前后的基质沥青及改性沥青的微观结构。 研究结果表明，加入硅灰改变了沥青的物理性能：沥青的软化点升高，老化后的软化点差值降低，针入度比和延度保留率增加；加入硅灰也改变了沥青的流变性能：沥青的车辙因子和复数剪切模量增大，相位角减小，老化后硅灰改性沥青的复合模量老化指数较低。硅灰对沥青物理性能和流变性能的这些影响均表明，加入硅灰提高了沥青的抗老化性能。与多聚磷酸改性沥青比较，，硅灰改性沥青能以较低廉的改性成本达到相同的抗老化性能。 红外光谱分析和扫描电镜分析结果揭示了硅灰提高沥青抗老化性能的机理在于：加入硅灰使沥青老化后的羰基指数减小，以及硅灰能够较均匀的分散在沥青中以达到较好的改善效果。
[Abstract]:In order to study the anti-aging performance of silica fume modified asphalt, the silica fume was prepared by comparison method, using polyphosphoric acid as reference, adding a certain amount of silica fume and polyphosphoric acid into the base asphalt, respectively. The aging process of polyphosphoric acid modified asphalt was simulated by short term aging test in rotary film oven. The basic physical properties and rheological properties of matrix asphalt and modified asphalt before and after aging were studied. The microstructure of matrix asphalt and modified asphalt before and after aging were analyzed by infrared spectroscopy and scanning electron microscope. The results showed that the physical properties of asphalt were changed by adding silica fume: the softening point of asphalt increased, the difference of softening point decreased after aging, the penetration ratio and ductility retention rate increased; The rheological properties of asphalt were also changed by adding silica fume: the rutting factor and complex shear modulus of asphalt were increased, the phase angle was decreased, and the aging index of composite modulus of modified asphalt was lower after aging. These effects of silica fume on the physical and rheological properties of asphalt show that the addition of silica fume can improve the aging resistance of asphalt. Compared with polyphosphoric acid modified asphalt, silica fume modified asphalt can achieve the same aging resistance with lower modification cost. The results of infrared spectroscopy and scanning electron microscopy show that the mechanism of silica fume to improve the aging resistance of asphalt is that the carbonyl index of asphalt after aging is reduced by adding silica fume. And silica fume can be dispersed in asphalt evenly to achieve better effect.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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