基于CT试验的混凝土裂纹扩展演化研究

发布时间：2018-03-05 17:10

本文选题：混凝土　切入点：CT试验　出处：《混凝土》2017年04期 　论文类型：期刊论文

【摘要】：针对混凝土宏观性能指标与破坏特性细观参数之间关系的技术难题,采用工业CT对单轴压缩条件下的混凝土试样进行了CT扫描试验;利用图像处理技术对混凝土CT图像进行分析,得到不同加载阶段混凝土孔隙和裂纹的三维细观模型及孔隙率变化规律。运用分形理论建立了CT图像分形维数计算模型,对混凝土CT图像分形特征进行了研究。结果表明:混凝土孔隙体积和分形维数的快速增大是混凝土失稳破坏的预警信息;利用混凝土CT三维重建图像结合分形理论观察研究混凝土裂纹扩展全过程,为有效分析混凝土细观损伤破坏提供了新技术。
[Abstract]:Aiming at the technical problem of the relationship between the macroscopic performance index of concrete and the meso-parameters of failure characteristics, the CT scanning test of concrete samples under uniaxial compression condition was carried out by industrial CT. Based on the analysis of CT images of concrete with image processing technology, the three-dimensional meso-model and porosity variation law of concrete pores and cracks at different loading stages are obtained. The fractal dimension calculation model of CT images is established by using fractal theory. The fractal characteristics of concrete CT images are studied. The results show that the rapid increase of pore volume and fractal dimension of concrete is the early warning information of concrete instability. The whole process of crack propagation of concrete is studied by using 3D reconstruction images of concrete CT and fractal theory, which provides a new technique for the effective analysis of the damage and failure of concrete in meso-scale.
【作者单位】：河北农业大学城乡建设学院;河北省第四建筑工程有限公司第六分公司;
【基金】：国家重点基础研究发展规划(973)项目(2010CB226801) 河北省教育厅重点项目(ZD2014073) 河北农业大学理工基金项目(LG201403);河北农业大学中青年教师境外研修项目(2014)
【分类号】：TU528.01

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