基于CT图像处理技术的混凝土损伤演化研究  

Study on damage development of concrete based on CT image processing

作　　者：郝景宏[1] 姜袁[1] 梅世强[1] 雷敏[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《人民长江》2010年第17期79-83,共5页Yangtze River

基　　金：国家自然科学基金项目(50679039);国家自然科学基金重大项目(90510017);中国博士后基金项目(20060390832)

摘　　要：采用X射线CT技术对单轴受压作用下的混凝土试件进行实时扫描观测,获得了混凝土试件的裂纹开裂、扩展、贯通的全过程图像。运用7种不同的方法分析了混凝土损伤演化全过程。分析结果表明,X射线CT是研究混凝土细观结构的有效方法,可以定性和定量分析混凝土细观结构损伤演化全过程;采用聚类分析算法,避免了由于窗宽和窗位不同引起的人为误差,真实地反映了混凝土细观结构,并较好地识别了粗骨料、砂浆和孔隙;通过差值算法得到的裂纹图像具有较强的直观性,有效地提取了裂纹;利用裂纹区像素点个数的变化代替CT数平均值,可以很好地反映混凝土损伤发展状态,当裂纹迅速扩展时,混凝土裂纹区像素点的个数发生了量级上的变化。Real-time scanning observations on concrete under uniaxial compression loading was performed by X-ray CT technology,and CT images of crack propagation,extension and failure were obtained.We analyzed the whole process of concrete damage development by seven methods.The results show that,X-ray CT is an effective method for research on concrete meso-structure,by which,we can analyze the whole process of meso-structural damage development of the concrete qualitatively and quantitatively;using cluster algorithm can avoid human errors caused by different window widths and window levels,therefore,the concrete meso-structure can be reflected actually and the coarse aggregate,mortar and pore can be identified better;crack images obtained by the difference method is more intuitive,and can extract the crack more effectively;compared with the average CT gray value,the variation of pixels number in crack zone can reflect the development of concrete damage much better.The number of pixels will change in magnitude when concrete damage develops.

关 键 词：混凝土 CT 图像处理 机理分析 损伤演化 

分 类 号：TV43[水利工程—水工结构工程]