白色硅藻土微观结构特征定量研究

硅藻土常常呈现白色、黄色、黑色等颜色,其中以白色硅藻土较为特殊,遇水后其强度明显降低.为了掌握白色硅藻土的工程特性,必须研究白色硅藻土的微观结构特征.本文以白色硅藻土为研究对象,通过扫描电镜试验,以数值化的形式展现其孔隙特征,从微观角度分析白色硅藻土的整体形貌,同时对白色硅藻土的微观结构进行量化分析,通过二值化处理以及...

QUANTITATIVE STUDY ON MICROSTRUCTURE CHARACTERISTICS OF WHITE DIATOMITE

Diatomite often appears white, yellow, black or other colors. The white diatomite is more special, and its strength decreases significantly when it meets water. In order to accurately grasp the engineering characteristics of white diatomite, it is necessary to master the microstructure of white diatomite. This paper takes the white diatomite as the research object. We use the SEM test and display the pore characteristics of the white diatomite by numerical method. The overall morphology of the white diatomite is analyzed from the microscopic point of view. At the same time, we quantitatively analyzes the microstructure of the white diatomite, and studies the micro characteristics of the pores of the white diatomite through the binarization analysis and fractal dimension analysis. The results show the following findings. (1)The white diatomite has a unique disordered porous structure. The aggregation of particles is mainly in the form of accumulation polymerization. Its overall structure is mainly in the form of dispersion structure. The contact form is mainly face-to-face. (2)The micro pore size of white diatomite is generally small. The pore size presents an irregular distribution with strong randomness. The pore structure has irregular shape, showing a small pore shape. (3)White diatomite has relatively high surface porosity. It is manifested as small pore size, large quantity and complex structure on the microscopic level. (4)White diatomite has good fractal characteristics. The fractal dimension of diatomite shows a nonlinear decreasing trend under different thresholds. The larger the threshold is, the larger the fractal dimension decreases. At the same time, the fractal dimension value of white diatomite is large. This result indicates that there are more pore structure units on the micro surface of white diatomite, which shows the characteristics of small pores and large number of pores on the macro level.