Issue 46

J. Liu et alii, Frattura ed Integrità Strutturale, 46 (2018) 352-360; DOI: 10.3221/IGF-ESIS.46.32 356 3D MESO SCALE MODEL OF CONCRETE CT IMAGE he Amira software was used to reconstruct the meso structure in 3D after the CT images were divided [13]. It is needed to say that Amira is a 3D visual modeling software system, and two basic components of the system, data and modules with different function, are included. The data are processed with modules by their connection with each other, then the visualization of scientific data can be realized in various application area, such as medical science, materials science, geophysics and engineering etc. The result of the 3D reconstruction shows in Fig. 5. Figure 5: From left to right: test specimens, aggregate, mortar, spatial distribution of cracks. In Fig. 5, the distribution of aggregate in concrete 3D reconstruction model accords with the original CT images, and the volume of each component is almost the same with the mix proportion of concrete. The visualization of cracks realizes with transparent processing, and the spatial shape is relatively clear, finally the cracks structure in concrete materials is shown in a real way. Subsequent work like image segmentation and extrusion of cracks can be done with Amira Software, and the Fig. 6 is the characteristic change chart of cracks and pores. Figure 6: Threshold segmentation map of Concrete pore under different scanning stage As shown in Fig. 6, there are cracks and pores in concrete surrounded by green area, then the cracks and pores show more clear in CT images through segmentation and extrusion. CT images in the upper of the test specimens from the 20th to 470th CT images were selected to gather statistical information on the volume of pores and the porosity in every 90 CT images, the relation graphs of pore volume, Pore ratio with pressure can be seen in Fig. 7, Fig. 8. T