Computation of Crack Tortuosity from Microtomographic Images of Cement‐based Materials
Computation of Crack Tortuosity from Microtomographic Images of Cement‐based Materials
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根据水泥基材料的显微断层图像计算裂纹弯曲度
DOI：
10.1063/1.3452106
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
T. Sugiyama
中科院分区：
文献类型：
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作者：
M. Promentilla;T. Sugiyama
水泥基材料（如砂浆和混凝土）的开裂是影响材料强度和耐久性的主要因素。因此，裂纹弯曲度对于理解和模拟归因于裂纹的微观结构对材料的输运性质的影响是重要的。本文介绍了一种方法来识别裂纹图案从显微断层图像和量化其曲折的三维图像分析和随机游走模拟，分别。弯曲度被定义为自由空间（无固体）中非吸附步行者的自扩散系数与裂纹空间中这些步行者的长期自扩散系数之比。X射线显微断层扫描是一种3D无损成像技术，用于以10微米的空间分辨率检查受损砂浆中的裂缝。给出了在循环冻融环境中砂浆的裂缝测量结果。
Cracking in cement‐based materials such as mortar and concrete plays a major factor in the material’s strength and durability. The crack tortuosity is therefore important to understand and model the effect of microstructure attributed to cracking on the transport properties of the material. This paper describes a method to identify the crack pattern from the microtomographic images and quantify its tortuosity by 3D image analysis and random walk simulation, respectively. The tortuosity is defined as the ratio of the self‐diffusion coefficient of non‐sorbing walkers in free space (no solids) to the long‐time self‐diffusion coefficient of these walkers in crack space. X‐ray microtomography, a 3D nondestructive imaging technique, was used to examine the cracks in damaged mortar at a spatial resolution of the order of 10 micrometers. Results of the crack measurement in a mortar that was subjected to cyclic freezing‐thawing environment were presented.