基于多参数描述的沥青混合料构成研究

发布时间：2018-12-11 00:47

【摘要】：沥青混合料是由不同粒径的矿料和沥青胶结料以及大小不同的空隙组成。现有的沥青混合料设计方法都是基于现象和经验,沥青混合料的构成机理未能深入研究,对沥青混合料内在信息未能充分挖掘,使得沥青混合料细观研究欠缺系统性和理论性。为了深入挖掘混合料内部信息,为其设计理论和质量评定提供支持,本文对沥青混合料细观参数进行了多参数表征研究。依据沥青路面的实际需求,重点研究了对沥青混合料性能影响起主要影响的粗集料分布状态和空隙分布状态。首先针对当前粗集料特性研究的不足,建立了基于角点检测的评价方法,提出了用于评价粗集料排布特性的合成质心距参数,对比了不同类型混合料不同平面区域参数的变化规律。同时为了研究混合料成型过程中粗集料的运动和破碎规律,分别建立了基于室内实测输入参数的数学模型,实现了粗集料的运动和破碎的图像处理技术检测,并对粗集料组成的细观区域变化进行了探索性研究。最后针对开级配抗滑磨耗层粗集料和空隙的相对分布进行了研究。通过以上研究,发现角点检测可以作为一种有效的粗集料评价方法,不同类型的混合料类型粗集料的排布规律表现出明显的差异性,从这个角度给出了传统室内沥青混合料模具尺寸的建议。同时发现粗集料在成型过程中的运动集中于一定压实次数下,提出了判定粗集料破碎程度的依据,开级配沥青混合料粗集料和空隙分布有明显的相关性。本文的研究从细观层次揭示了沥青混合料内部组成的特点,提供了检测混合料运动的方法,对混合料成型行为进行了多参数描述,为沥青混合料的设计和质量评定提供了理论支持。
[Abstract]:Asphalt mixture is composed of mineral aggregate with different particle size, bituminous binder and void of different size. The existing design methods of asphalt mixture are based on phenomenon and experience. The structure mechanism of asphalt mixture has not been studied deeply, and the inherent information of asphalt mixture has not been fully excavated, which makes the research of asphalt mixture meso-scale lack of systematization and theory. In order to excavate the internal information of asphalt mixture and provide support for its design theory and quality evaluation, this paper studies the multi-parameter characterization of asphalt mixture's meso-parameters. According to the actual demand of asphalt pavement, the distribution state of coarse aggregate and voids which mainly affect the performance of asphalt mixture is studied. In view of the deficiency of current research on coarse aggregate characteristics, an evaluation method based on corner detection is established, and a synthetic centroid distance parameter is proposed to evaluate the distribution characteristics of coarse aggregate. The variation law of the parameters of different types of mixtures in different plane regions is compared. At the same time, in order to study the movement and breaking law of coarse aggregate in the process of mixture forming, the mathematical model based on indoor measured input parameters is established, and the motion of coarse aggregate and the image processing technology of crushing are realized. An exploratory study on the regional variation of coarse aggregate composition was carried out. Finally, the relative distribution of coarse aggregate and voids in the open gradation anti-slip layer is studied. Through the above research, it is found that corner detection can be used as an effective evaluation method for coarse aggregate, and the distribution law of coarse aggregate of different types of mixture shows obvious differences. From this point of view, the suggestion of mould size of traditional indoor asphalt mixture is given. At the same time, it is found that the movement of coarse aggregate in the process of forming is concentrated under certain compaction times, and the basis for judging the degree of coarse aggregate breaking is put forward. The distribution of coarse aggregate and void of open graded asphalt mixture has obvious correlation. In this paper, the characteristics of the internal composition of asphalt mixture are revealed from the microscopic level, the method of detecting the mixture movement is provided, and the multi-parameter description of the mixture forming behavior is carried out. It provides theoretical support for the design and quality evaluation of asphalt mixture.
【学位授予单位】：东南大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：U414

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