Development of visualization technique relating to physical property for the diagnosis of concrete structure

混凝土是一种主要的建筑材料，因此在不同的环境下被用于各种类型的结构构件。已经发现，一些混凝土结构表现出恶化与裂缝和蚀变。为了对这些退化混凝土进行升级改造，首先需要进一步发展诊断技术，以便采取下一步适当的修复措施。可视化技术现在很流行，因为可以通过图像分析和类似的方法进行合理的评估。要做到这一点，X射线计算机断层扫描（XRCT）被认为是有前途的工具。它能够获得内部微观结构和裂纹的三维图像。然后，本研究的目的是澄清XRCT的能力，使用砂浆标本。结果发现，可以获得3D裂纹图像，并且可以量化裂纹几何形状，例如10微米或更大的裂纹宽度分布。

Concrete is a primary construction material and hence has been used for varied types of structural members under diverse environments. It has been found that some concrete structures exhibit deterioration with cracks and alteration. For upgrading these degraded concrete the technology of diagnosis needs to be further developed first so that one can take next proper action for repairing.Visualization technique is now popular because rational evaluation can be made through image analysis and similar methods. To do so a X-ray Computed Tomography (XRCT) is considered promising tool. It can enable to obtain three dimensional images of internal microstructure and cracks. Then this research aims to clarify the capacity of the XRCT using mortar specimens. It was found that the 3D crack image could be obtained and the crack geometry such as crack width distribution with 10 micrometers or larger was quantified.