基于数字图像处理的沥青混合料集料形状及分布研究

发布时间：2018-01-29 08:11

本文关键词： 数字图像处理针片状集料主轴排列离散程度　出处：《南华大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着沥青混凝土的普遍应用,对其进行的研究也日新月异。目前主流的研究均是基于像马歇尔之类的宏观力学性能或者体积参数实验。而本文主要从数字图像处理这个角度出发,直接对混合料中的集料几何信息和位置分布进行统计。对集料的针片状含量、主轴分布、质心离散程度进行分析,从而了解并总结混合料内部集料在外界实验因素和制作过程中的分布规律。对沥青混合料在优化配合比方面以及更深一步对集料分布的研究有一定的启发意义。实验发现混合料中针片状集料的数量和分布,只与材料的原材料结构和制作工艺有关。后续的如增加击实次数和引入玻璃集料与其均无相关性。针片状集料基本出现在大粒径档,小粒径集料在生产后表面能均达到高水平,不易被压碎。同时等效椭圆长短轴之比分别为3:1,2.5:1,2:1去判别针片状集料时,不出现针片状集料突然增多现象。集料的主轴方向排列是受到一系列力作用的综合结果。实验表明在击实初期,击实功对于主轴排列的贡献就已完成,后续的击实已无明显影响。玻璃的大内摩擦角以及在试件中部的集料由于约束较多主轴排列更加稳定。同时值得提出的是各档集料的主轴排列和截面整体集料的排列无较高相关度。集料的离散程度受到击实功的影响较大。虽然有试模壁的限制,但是由于空隙率的存在,击实所产生的间接拉力使集料在截面上更加离散。在粒径方面,大粒径集料更能自主迁移,而小粒径集料只能绕着大粒径集料四处流淌,所以大粒径集料的离散程度要高。未来伴随着电子技术的迅猛发展,基于数字图像处理技术对于材料试验的研究必将是趋势所在。本文基于数字图像处理对于沥青混合料的研究,对沥青混凝土更深层次集料分布的研究有一定的启发作用。
[Abstract]:With the widespread application of asphalt concrete. The current mainstream research is based on macro-mechanical properties such as Marshall or volume parameters experiments. This paper mainly from the point of view of digital image processing. The geometric information and location distribution of aggregate in the mixture are analyzed directly. The needle content, spindle distribution and dispersion degree of center of mass of aggregate are analyzed. Therefore, it is helpful to understand and summarize the distribution of aggregate in the external experiment and production process, which is helpful to the optimization of mixture ratio and the further study of aggregate distribution. It is found that the quantity and distribution of the needle-like aggregate in the mixture. It has nothing to do with the raw material structure and the manufacturing process. The subsequent ones, such as increasing the compaction times and introducing glass aggregate, have no correlation with it. The needle-like aggregate basically appears in the large particle size range. The surface energy of the small size aggregate is high after production, and it is not easy to be crushed. The ratio of the equivalent elliptical axis is 3: 1 / 2.5: 1: 2: 1 to judge the needle sheet aggregate. There is no sudden increase of needle-shaped aggregates. The main axis alignment of aggregates is the result of a series of forces. The experimental results show that the contribution of compaction work to spindle alignment has been completed in the early stage of compaction. There is no obvious effect on subsequent compaction. The large angle of internal friction of glass and the arrangement of aggregate in the middle of the specimen are more stable because of more constraints. At the same time, it is worth mentioning that the main axis arrangement of each grade aggregate and the aggregate of the whole section are more stable. The dispersion of aggregates is greatly affected by the compaction work, although there are some limitations on the test die wall. However, due to the existence of voidage, the indirect tensile force produced by compaction makes the aggregate more discrete in the section, and in the aspect of particle size, the large particle size aggregate can migrate more independently. The small size aggregate can only flow around the large size aggregate, so the dispersion degree of the large size aggregate is high. In the future, with the rapid development of electronic technology. The research of material test based on digital image processing technology will be the trend. This paper based on digital image processing for asphalt mixture research. The research on the deeper aggregate distribution of asphalt concrete has some enlightening effect.
【学位授予单位】：南华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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