基于CT-连续加荷水泥乳化沥青混凝土细观损伤规律研究  

Research on Meso-damage of Cement Emulsified Asphalt Concrete under Continuous Loading by CT Scanning

作　　者：闫小虎[1,2] 杨华全[1,2] 石妍[1,2] 李明霞[1,2] 

机构地区：[1]长江科学院国家大坝安全工程技术研究中心,武汉430010 [2]长江科学院水利部水工程安全与病害防治工程技术研究中心,武汉430010

出　　处：《长江科学院院报》2013年第3期75-78,84,共5页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金重点项目(50539010);中央级公益性科研院所基本科研业务费(KSF2011018/CL)

摘　　要：利用CT技术对水泥乳化沥青混凝土的细观损伤过程进行实时扫描观测,获得了混凝土试件在连续加荷下的CT图像。通过采用直观分析法、CT数分析法、CT数与损伤变量关系3种方法分析表明,水泥乳化沥青混凝土的破坏过程可分为压密、扩容、裂纹扩展、破坏4个阶段,同时混凝土在受压过程中具有韧性,在极限荷载之前各断面处于压密和微扩容的强化阶段,极限荷载之后混凝土从损伤到破坏发展比较平稳。Real-time scanning observation on the meso-damag by means of computerized tomography （CT）. The CT images e in cement emulsified asphalt concrete was carried out of concrete samples under continuous loading were ob- tained. With approaches of visual analysis, CT number analysis and analysis on the relation between CT number and damage variable, it was concluded that the divided into four stages as follows： compression, damage process of the cement emulsified asphalt concrete could be enlargement, crack expansion, and damage. Meanwhile, the con- crete has toughness in the compression process. Before the ultimate load, micro-enlargement intensified into compaction for each section of the concrete ; whereas after the ultimate load, damage developed to failure steadily.

关 键 词：水泥乳化沥青混凝土 CT试验 CT图像 CT数 损伤变量 

分 类 号：TU528.42[建筑科学—建筑技术科学]