Characterization of Ice Distribution in Geotechnical Materials Based on Cryo-electron Microscopy
Quantitatively describing the distribution characteristics of ice in geotechnical materials from a microscopic perspective is crucial.Based on the technique of cryo-electron microscopy(Cryo-EM),an experimental characterization method of the distribution of ice in porous geotechnical materials is proposed.For artificial core samples with different ice saturations,the distribution of ice in porous geotechnical materials is confirmed by elemental content distribution and comparison of images before and after sublimation based on the secondary electron(SE)images and energy spectrum analysis maps of the samples at different magnifications.With the increase of ice saturation,the pore space of the skeleton is filled by ice,the area of the skeleton particle surface wrapped by ice increases,the sample section is denser and flatter,and the stacking structural characteristics of the geotechnical skeleton become weaker.In the backscattered electron(BSE)image,the image of ice is less bright than that of the geotechnical skeleton,based on which a digital image calculation method for the ice saturation of the sample is developed.The deviation of the ice saturation calculated by this method before sublimation from the ice saturation of the predesigned sample is less than 5%,and the results are accurate and reliable.
geotechnical materialscryo-electron microscopy(Cryo-EM)ice distribution statedigital image analysis
万方数据
维普
