| 覃茜,徐千军.基于CT 图像的混凝土初始缺陷分布规律研究[J].水利学报,2016,47(7):959-966 |
| 基于CT 图像的混凝土初始缺陷分布规律研究 |
| Statistics of the initial defects within concrete based on CT image |
| 投稿时间：2015-09-03 |
| DOI：10.13243/j.cnki.slxb.20150935 |
| 中文关键词: 混凝土 CT 初始缺陷 椭球 概率密度 |
| 英文关键词: concrete initial defect CT ellipsoid probability density |
| 基金项目:国家重点基础研究发展计划（973）项目（2013CB035902）；国家自然科学基金重点项目（51339003）；水沙科学与水利水电工程国家重点实验室自主课题（2016-ky-05） |
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| 摘要点击次数: 1866 |
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| 中文摘要: |
| 混凝土材料是由骨料、砂浆、初始缺陷组成的多相复合材料。为了得到初始缺陷的分布规律，本文利用CT 断层扫描技术获得的混凝土试件各断层扫描图片，通过图像处理软件提取和重构了试件中初始缺陷的空间形貌。然后采用MATLAB 编程实现对各个不连通缺陷的区分，进而对每一个缺陷都分别用不同的椭球进行近似。对椭球的方位、位置和尺寸等参数进行概率密度统计和拟合，得到了混凝土内初始缺陷定量的分布规律，椭球方位角可能呈正态、指数或均匀分布，缺陷中心点位置呈均匀分布，尺寸呈对数正态或极值分布，提供了对混凝土初始缺陷分布特征的定量描述。 |
| 英文摘要: |
| Concrete is a multiphase composite material consisting of aggregates, mortar and initial defects. In order to understand the distribution of the initial defects, X-ray computed tomographic images were utilized to extract and reconstruct the three dimensional configuration of the defects by means of the image processing software. Each individual defect was identified and approximated with a specific ellipsoid using MATLAB codes. Statistics of the parameters of the ellipsoid, such as axis orientation, coordinates of the center, as well as the semimajor axis, can provide distributions of the initial defects within concrete. It was demonstrated that normal distribution, exponential distribution or uniform distribution could be used to describe the distribution of the axis orientation, and uniform distribution might be suitable for the position of the defects, while logarithmic normal distribution or extreme value distribution might be appropriate for the size of the defects. Such quantitative statistics improve our knowledge of initial defects within concrete. |
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