基于高低温及疲劳性能的沥青胶浆流变特性研究

发布时间：2018-01-29 19:34

本文关键词： 矿粉高粘沥青胶浆流变性能多应力重复蠕变恢复灰关联分析　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：沥青路面的使用比较普遍,在我国已运行的高等级路面中,沥青路面占到近90%,而沥青路面的使用性能与寿命主要取决于沥青及其混合料的性能。因此,沥青及其混合料成为道路建设行业关注的焦点。然而,矿粉-沥青组成的胶浆体系对沥青混合料的性能有着很大的影响。目前,对于沥青胶浆的研究还不是很成熟,并且对于高粘沥青胶浆的研究很少。本文在借鉴已有的相关研究成果之上,对基质沥青胶浆和高粘沥青胶浆的流变性能进行研究,目的在于探讨两种类型沥青胶浆的区别、矿粉指标对胶浆性能的影响等。首先用激光粒度分析仪等仪器对选用的5种矿粉的物理化学指标进行测定,得到了不同矿粉的密度、粒度分布、细度模数、比表面积等其他指标,并着重分析了矿粉粒度分布。结果显示对于同样0.075mm通过率的矿粉,其细部的连续性有差别,相比与矿粉的规范要求,用细度模数等粒度指标能更准确表征矿粉的细度。其次,通过研究两种类型沥青胶浆的流变特性,发现矿粉对沥青胶浆具有明显的模量增效行为,使得沥青胶浆的高温抗变形能力增强,低温抗裂性能变差,同时降低了沥青胶浆的疲劳寿命。并且矿粉对沥青胶浆的相位角影响很小,不同矿粉及粉胶比对沥青胶浆流变性能的影响存在差别。基质沥青胶浆与高粘沥青胶浆存在性能上的差异,试验结果表明高粘沥青胶浆的高温、低温及疲劳性能要好于基质沥青胶浆。试验还发现通过多应力重复蠕变恢复试验(MSCR)得到的不可恢复蠕变柔量差Jnr-diff,可以用来判别基质沥青胶浆的最大粉胶比。通过分析粉胶比对沥青胶浆流变性能的影响,确定了沥青胶浆的合理粉胶比范围。基于灰色关联分析,研究了矿粉的不同物理化学指标与沥青胶浆高温、低温及疲劳性能之间的关联性,并得到了矿粉对沥青胶浆性能影响的关键指标,如密度、亲水系数、P20、D10、比表面积及细度模数。最后,通过沥青胶浆的黏附性试验与混合料冻融劈裂强度试验来评价沥青混合料的水稳性能,结果表明高粘沥青及其胶浆的黏附性比基质沥青好的多,而高粘沥青及其胶浆的黏附性不足以评价沥青混合料的水稳性能。高粘沥青在混合料使用中存在着一个最佳粉胶比,超过此粉胶比,将对沥青混合料的水稳性能有影响。
[Abstract]:The use of asphalt pavement is relatively common. In the high grade pavement in our country, asphalt pavement accounts for nearly 90%, and the performance and life of asphalt pavement mainly depend on the performance of asphalt and its mixture. Asphalt and its mixture have become the focus of the road construction industry. However, the slurry system composed of mineral powder and asphalt has a great impact on the performance of asphalt mixture. The research on asphalt mortar is not very mature, and the research on high viscosity asphalt mortar is very few. The rheological properties of matrix asphalt mortar and high viscosity asphalt slurry were studied in order to explore the difference between the two types of asphalt mortar. First, the physical and chemical indexes of five kinds of mineral powder were measured by laser particle size analyzer, and the density, particle size distribution and fineness modulus of different ore powder were obtained. The results show that for the same 0.075mm pass rate, the continuity of the fine parts is different, compared with the specification requirements of the ore powder. Particle size index such as fineness modulus can be used to characterize the fineness of ore powder more accurately. Secondly, by studying the rheological characteristics of two types of asphalt mortar, it is found that ore powder has obvious modulus-synergistic behavior to asphalt mortar. The high temperature deformation resistance and low temperature crack resistance of asphalt mortar are enhanced, and the fatigue life of asphalt mortar is reduced, and the effect of mineral powder on the phase angle of asphalt mortar is very small. The effect of different mineral powder and ratio of powder to glue on rheological properties of asphalt slurry is different. The difference of the existence performance of matrix asphalt slurry and high viscosity asphalt slurry is also discussed. The test results show that the high temperature of high viscosity asphalt slurry is obtained. The low temperature and fatigue properties are better than that of the matrix asphalt mortar. It is also found that the unrecoverable creep compliance difference (Jnr-diff) obtained from the multi-stress repeated creep recovery test (MSCR) is better than that of the matrix asphalt mortar. It can be used to judge the maximum powder / binder ratio of base asphalt mortar. By analyzing the influence of the ratio of powder to glue on the rheological properties of asphalt mortar, the reasonable range of powder / binder ratio of asphalt mortar is determined, based on grey correlation analysis. The relationship between the different physical and chemical indexes of mineral powder and the high temperature, low temperature and fatigue properties of asphalt slurry was studied. The key indexes of the influence of mineral powder on the properties of asphalt mortar, such as density, hydrophilic coefficient, P20, were obtained. D10, specific surface area and fineness modulus. Finally, the stability of asphalt mixture was evaluated by the adhesion test of asphalt mortar and the test of freeze-thaw splitting strength of asphalt mixture. The results show that the adhesion of high viscosity asphalt and its mortar is much better than that of base asphalt. However, the adhesion of high viscosity asphalt and its mortar is not enough to evaluate the water stability of asphalt mixture. There is an optimum powder / binder ratio in the use of high viscosity asphalt, which exceeds the powder / binder ratio. It will affect the water stability of asphalt mixture.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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