沥青混合料真空压实特性的台架试验研究

发布时间：2018-11-29 08:42

【摘要】：压实是沥青路面修建的重要环节,压实方法和设备的性能直接影响压实效率与沥青路面的质量。本文针对现有压实方法的不足,为深入研究沥青混合料真空压实特性,设计加工了多功能沥青混合料真空加载试验台,以某常用的沥青混合料为研究对象,完成了不同加载方式下不同真空度的对比试验。本文首先介绍了沥青混合料组成结构及强度理论,分析了真空压实对沥青混合料压实特性的影响;其次,通过台架试验从压实过程和压实后宏观力学性能两方面对比分析了真空压实的特点;最后,通过静载、振动、冲击三种不同加载方式与不同真空度组合的对比试验,完成了真空压实和常规压实方法的对比。试验结果表明,真空压实对沥青混合料压实过程和宏观力学性能有显著的影响。在同等试验条件下,沥青混合料单次回弹量和累积回弹量均随着真空度的增加而减小,累积沉降量均随着真空度的增加而增大。在同等试验条件下,空隙率均随着真空度的增加而减小,马歇尔稳定度、劈裂强度、抗压强度等力学指标均随着真空度的增加而增加。不同加载方式下,与非真空相比,-0.08MPa真空获得的空隙率降低8.5%以上;马歇尔稳定度、劈裂强度和抗压强度分别提高3.79%、4.55%和9.23%以上。证明真空压实不但具有明显的压实优势,而且对不同的加载方式具有普遍适用性。
[Abstract]:Compaction is an important part of asphalt pavement construction. The compaction method and the performance of equipment directly affect the compaction efficiency and the quality of asphalt pavement. In order to study the vacuum compaction characteristics of asphalt mixture, a multi-function asphalt mixture vacuum loading test-bed is designed and processed in this paper. A common asphalt mixture is used as the research object. The contrast test of different vacuum degree under different loading mode has been completed. In this paper, the composition structure and strength theory of asphalt mixture are introduced, and the influence of vacuum compaction on compaction characteristics of asphalt mixture is analyzed. Secondly, the characteristics of vacuum compaction are compared and analyzed in terms of compaction process and macroscopic mechanical properties after compaction through bench test. Finally, the comparison of vacuum compaction and conventional compaction method is completed by comparing the static load, vibration and shock loading with different vacuum degree combination. The experimental results show that vacuum compaction has a significant effect on the compaction process and macroscopic mechanical properties of asphalt mixture. Under the same test conditions, the single springback and cumulative springback of asphalt mixture decrease with the increase of vacuum degree, and the cumulative settlement increase with the increase of vacuum degree. Under the same experimental conditions, the porosity decreases with the increase of vacuum degree, and the mechanical indexes such as Marshall stability, splitting strength and compressive strength increase with the increase of vacuum degree. Under different loading modes, the void ratio obtained by-0.08MPa vacuum is decreased by more than 8.5%, and the Marshall stability, splitting strength and compressive strength are increased by 3.79% and 9.23%, respectively. It is proved that vacuum compaction not only has obvious compaction advantages, but also has universal applicability to different loading modes.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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