热拌沥青混合料的筛分机理及试验研究

发布时间：2018-02-26 21:29

本文关键词： 热拌沥青混合料筛分级配曲线沥青含量胶浆分形　出处：《武汉工程大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,随着我国交通运输事业的快速发展,沥青路面因其具有行车舒适、修建迅速、维修方便及防眩低噪等优点,逐渐成为我国道路路面结构的主要形式,沥青混合料的需求也日益增加。研究热拌沥青混合料筛分,可以进一步了解其特点和性质,并探索一次拌和得到两种甚至多种不同配合比的热拌沥青混合料的可能性。本文首先设计了一套简单的热拌沥青混合料(HMA)实验室筛分试验程序:①由马歇尔设计法得到AC-13与AC-20两种HMA,将这两种HMA搅拌后依次通过孔径为16mm、13.2mm、4.75mm的方孔筛进行筛分;②对筛分得到的四档沥青混合料按照一定比例进行重新分配,得到新的AC-13(n)与AC-20(n);③通过燃烧法和抽提法试验测定AC-13(n)与AC-20(n)的沥青含量及其矿料级配曲线;④分别对比AC-13(n)与AC-13和AC-20(n)与AC-20的沥青含量和矿料级配曲线变化情况。然后通过分析试验数据和观察试验现象,探究热拌沥青混合料筛分的可行性。最后尝试引入了胶浆理论和分形理论,对热拌沥青混合料的筛分机理进行分析。本文的主要研究结论包括:(1)热拌沥青混合料筛分是可行的。通过筛分得到的新沥青混合料在沥青含量和矿料级配曲线方面均符合规范规定的范围,且偏离最初的设计很小。(2)沥青结合料的黏性对热拌沥青混合料筛分有影响。随着沥青结合料黏性增大,将致使热拌沥青混合料在筛分过程中透筛不够充分。另外,随着结合料黏性的增大,筛网上粘附的细集料增多,使得细集料的偏差更加明显。(3)在一定范围内,随着粉胶比的提高,沥青胶浆的黏性逐渐增大,沥青胶浆的高黏性影响细集料在粗集料表面的粘附,最终会影响热拌沥青混合料筛分中的矿料分布。(4)影响热拌沥青混合料筛分的因素,除与其自身特性有关,还与筛分方式、筛网特征及其他外界因素有关。(5)对于连续密级配热拌沥青混合料,适当提高沥青结合料的黏性,可以改善沥青混合料级配离析。(6)初次尝试将分形理论应用到了热拌沥青混合料筛分分析中。研究表明,筛分后的各档沥青混合料级配曲线具有显著的分形特征,引入分形理论进行相关分析是一个有益的尝试。
[Abstract]:In recent years, with the rapid development of transportation in China, asphalt pavement has gradually become the main form of road pavement structure in China because of its advantages of comfortable driving, rapid construction, easy maintenance and anti-dazzling and low noise. The demand for asphalt mixture is also increasing day by day. To study the screening of hot mix asphalt mixture, we can further understand its characteristics and properties. And to explore the possibility of getting two or more kinds of hot mix asphalt mixture with different mix ratio at one time. In this paper, a simple laboratory screening test program: 1 was designed by Marshall method. Two kinds of HMAs, AC-13 and AC-20, were obtained by mixing the two kinds of HMA, and then the four grade asphalt mixture was redistributed according to a certain proportion through the square hole sieve with the aperture of 16mm ~ 13.2mm ~ 4.75mm. A new AC-13 (n) and AC-20 (n) 3 were obtained. The asphalt content and aggregate gradation curve of AC-13 (n) and AC-20 (n) were determined by combustion and extraction methods respectively. The asphalt content and aggregate gradation curve of AC-13 (n) and AC-20 (n)) and AC-20 were compared with those of AC-13 (n) and AC-20 (n) and AC-20, respectively. Then, the asphalt content and aggregate gradation curve of AC-13 (n) and AC-20 (n) were compared with those of AC-20 (n) and AC-20. Analysis of experimental data and observation of experimental phenomena, The feasibility of sieving hot mix asphalt mixture is explored. Finally, the slurry theory and fractal theory are introduced. The screening mechanism of hot mix asphalt mixture is analyzed. The main research conclusions in this paper include: 1) screening of hot mix asphalt mixture is feasible. All comply with the scope specified in the Code, Moreover, the viscosity of asphalt binder has an effect on the screening of hot mix asphalt mixture. With the increase of viscosity of asphalt binder, it will lead to inadequate screening of hot mix asphalt mixture during screening process. With the increase of the viscosity of binder, the adhesion of fine aggregate on the screen increases, which makes the deviation of fine aggregate more obvious in a certain range. With the increase of the ratio of powder to binder, the viscosity of asphalt mortar increases gradually. The high viscosity of asphalt mortar affects the adhesion of fine aggregate on the surface of coarse aggregate, and finally affects the distribution of mineral aggregate in the screening of hot mix asphalt mixture. 4) the factors affecting the screening of hot mix asphalt mixture are related not only to its own characteristics, but also to the screening method. Sieve mesh characteristics and other external factors. 5) for continuous dense gradation hot mix asphalt mixture, the viscosity of asphalt binder can be improved appropriately. The fractal theory is applied to the screening analysis of hot mix asphalt mixture for the first time. The research shows that the gradation curve of each grade asphalt mixture after screening has remarkable fractal characteristics. It is a useful attempt to introduce fractal theory into correlation analysis.
【学位授予单位】：武汉工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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