A System for Microscopic Image Analysis for Studying Fracture Toughness of Cement Composites

购买图像分析系统，评估硅酸盐水泥基复合材料缺陷的各种几何特征，记录它们在宏观断裂前的相互作用。抛光切片的图像（浸渍荧光环氧树脂）将使用高分辨率视频扫描仪进行放大和数字化。数字化图像将被增强、编辑、存储和操作，以获得缺陷结构的定量测量。这将通过彩色电视显示器和主机来完成。除了量化缺陷结构及其相互作用外，还将进行断裂韧性测量，并建立缺陷结构与断裂韧性的理论模型。考虑到断裂过程区，给出了非线性断裂力学和裂纹屏蔽现象。该设备将有助于研究裂缝结构对水泥、砂浆、混凝土和其他水泥基复合材料断裂性能的影响。

An image analysis system will be purchased to evaluate various geometrical features of the flaws of portland cement-based composites and to record their interaction preceding macroscopic fracture. An image of a polished section (impregnated with a fluorescent epoxy) will be magnified and digitized using a high resolution video scanner. The digitized image will be enhanced, edited, stored and manipulated to obtain quantitative measures of the flaw structure. This will be done using color TV monitors and a host computer. In addition to quantifying flaw structure and their interactions, fracture toughness measurements will be made and theoretical models relating flaw structure to fracture toughness will be developed. Due consideration to fracture process zone, nonlinear fracture mechanics and crack shielding phenomena will be given. The equipment will enable studies leading to a basic understanding of the influence of flaw structure on fracture properties of cement, mortar, concrete and other cement-based composites.