沥青混合料装料、卸料过程中的离析研究

发布时间：2018-03-28 18:33

本文选题：沥青混合料　切入点：集料离析　出处：《长安大学》2015年硕士论文

【摘要】：沥青路面是我国公路路面结构的主要形式,沥青混合料在整个施工过程中产生的离析,容易使路面出现早期病害破坏现象,大大缩短沥青路面的使用寿命。所以认识混合料离析和路面离析之间的关系,研究沥青混合料在施工过程中的离析,提出相应的减少离析的措施,对减少沥青路面早期病害和提高路面使用质量有重要意义。分析各种离析类型的形成机理和对路面早期病害的破坏机理,并对各种路面离析检测方法进行优缺点分析。结合沥青混合料的施工特点,重点分析了集料离析在整个沥青路面生产过程各环节产生的原因,并提出了相应减少离析的控制措施。混合料在装料和卸料过程中发生的竖向位移较大,容易产生严重的集料离析现象,所以选择混合料的装料和卸料过程做离析研究,通过对集料进行不同颜色染色并用透明的胶结材料替代沥青,即用染色集料和胶水在常温下拌和替代热拌沥青混合料,用自制试验装置室内模拟装料和卸料过程,用图像处理技术对试验所得截面图像进行处理,用格子方差法计算出混合料的整体均匀度,提出用均匀度作为评价混合料离析的指标,即混合料均匀度越小,集料离析越严重。试验分别研究了级配对离析的影响关系、装料试验运输车车厢底部构造对离析的影响、卸料试验运输车车厢升起不同角度对离析的影响,通过对试验图像处理和数据统计得出,相同试验过程不同级配混合料离析程度:AC-20AC-13SMA-13,装料试验过程中车厢底部加两侧挡板可以减少混合料离析,卸料试验过程中运输车升起角度越大,混合料越以整体形式落料,车厢里上下层集料相对运动较小,混合料越均匀离析越少。
[Abstract]:Asphalt pavement is the main form of highway pavement structure in China. The segregation of asphalt mixture in the whole construction process makes the pavement appear early damage phenomenon. The service life of asphalt pavement is shortened greatly. Therefore, the relationship between mixture segregation and pavement segregation is recognized, the segregation of asphalt mixture in construction process is studied, and the corresponding measures to reduce segregation are put forward. It is of great significance to reduce the early diseases of asphalt pavement and improve the pavement quality. The formation mechanism of various segregation types and the failure mechanism of early pavement diseases are analyzed. The advantages and disadvantages of all kinds of pavement segregation detection methods are analyzed. Combined with the construction characteristics of asphalt mixture, the causes of aggregate segregation in each link of the whole asphalt pavement production process are analyzed emphatically. The vertical displacement of mixture in the process of loading and unloading is larger, and it is easy to produce serious aggregate segregation phenomenon, so the segregation of the mixture during loading and unloading is studied. By dyeing aggregates in different colors and replacing asphalt with transparent cementing materials, that is, mixing and replacing hot mix asphalt mixtures with dyed aggregates and glue at room temperature, a self-made test device is used to simulate the loading and unloading process. The image processing technology is used to process the cross-section image obtained from the test, and the overall uniformity of mixture is calculated by the lattice variance method, and the uniformity is used as the index to evaluate the segregation of mixture, that is, the smaller the uniformity of mixture, the smaller the mixture uniformity is. The more serious the aggregate segregation is, the more serious the segregation is. The influence of gradation on segregation is studied respectively, the influence of loading test truck bottom structure on segregation, and the influence of different angle of unloading truck car on segregation are studied. According to the image processing and data statistics of the test, the segregation degree of different gradation mixture: AC-20AC-13SMA-13SMA-13 is obtained in the same test process, and the segregation of the mixture can be reduced by adding two side baffles to the bottom of the car during the loading test. In the process of unloading test, the bigger the lift angle of the truck is, the more the mixture is blanked in an integral form, the smaller the relative movement of the aggregate in the upper and lower layers of the car is, and the less the mixture is more evenly segregated.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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