红外图像温度离析定量评价方法

发布时间：2018-05-03 04:31

本文选题：温度离析 + 红外热像仪　；参考：《长安大学》2014年硕士论文

【摘要】：沥青路面是我国路面结构的主要形式，，其中摊铺、碾压过程中存在的温度离析已经成为沥青路面早期局部破坏的主要原因之一，所以沥青混合料在压实阶段温度的控制是影响其最终成型质量的关键因素。因此，及时地进行温度监测，对温度离析状况做出正确的评价对提高道路施工质量有很大的帮助。本文从道路材料和施工角度阐述了温度离析成因，通过对比当前几种路用温度监测方法证明了红外热像仪监测温度离析的优势；利用红外热辐射规律，提出了使用红外热像仪监测沥青混合料温度的正确操作方法；结合混合料温度监测的状况对不同红外热像仪进行了性能对比，选择出了适用于监测沥青混合料的红外热像仪的具体参数；改善了当前温度离析的研究仅基于“点温度”的统计方法，运用图像处理技术设计了红外图像分割系统，得到了影响温度离析程度的低温区域面积和分布两个重要参数，将研究范围从“点统计”扩展到了“面统计”；改进了美国NCAT温度离析标准，综合温差、低温面积、低温分布状况三个参数提出了新的温度离析评价指标温度离析指数TSI，弥补了当前温度离析评价仅依靠温差判断的缺陷；设计了室内试验模拟路面温度离析，将温度离析的研究从施工现场转移到实验室内进行；通过室内试验得到的红外图像对温度离析指数TSI进行了反算与验证，检测结果表明温度离析指数可以对不同红外图像做出区分，证明此理论指标进行实际施工评价的可行性。
[Abstract]:Asphalt pavement is the main form of pavement structure in China. The temperature segregation in the process of spreading and compacting has become one of the main reasons for the early local damage of asphalt pavement. So the temperature control of asphalt mixture in compaction stage is the key factor to affect the final molding quality. Therefore, timely temperature monitoring and correct evaluation of temperature segregation are of great help to improve the quality of road construction. In this paper, the causes of temperature segregation are expounded from the point of view of road materials and construction. The advantages of infrared thermal imager in monitoring temperature segregation are proved by comparing with several current road temperature monitoring methods, and the rules of infrared thermal radiation are used. The correct operation method of using infrared thermal imager to monitor bituminous mixture temperature is put forward, and the performance of different infrared thermal imager is compared with the state of mixture temperature monitoring. The specific parameters of infrared thermal imager suitable for monitoring asphalt mixture are selected, the current research on temperature segregation is improved only based on the statistical method of "point temperature", and the infrared image segmentation system is designed by using image processing technology. Two important parameters, the area and distribution of low temperature region, which affect the degree of temperature segregation, are obtained, and the range of research is extended from "point statistics" to "surface statistics", and the American NCAT standard of temperature segregation is improved, the comprehensive temperature difference and low temperature area are improved. The three parameters of low temperature distribution condition put forward a new index of temperature segregation evaluation, temperature segregation index (TSI), which makes up for the defect that the current evaluation of temperature segregation only depends on temperature difference, and designs the indoor test to simulate the temperature segregation of road surface. The study of temperature segregation was transferred from the construction site to the laboratory, and the temperature segregation index (TSI) was calculated and verified by the infrared image obtained from the laboratory test. The test results show that the temperature segregation index can distinguish different infrared images and prove the feasibility of the theoretical index for practical construction evaluation.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP391.41;U416.217

【参考文献】