基于CT-连续加荷水泥乳化沥青混凝土细观损伤规律研究

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。

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

Real-time scanning observation on the meso-damage in cement emulsified asphalt concrete was carried out by means of computerized tomography (CT). The CT images of concrete samples under continuous loading were obtained. With approaches of visual analysis, CT number analysis and analysis on the relation between CT number and damage variable, it was concluded that the damage process of the cement emulsified asphalt concrete could be divided into four stages  as follows: compression, enlargement, crack expansion, and damage. Meanwhile, the concrete 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.