Particle Size Identification In Diatomaceous Soils _ Hydrometry Vs Image Processing

Abstract

The particle size distribution of soils greatly influences their mechanical and hydraulic behavior. Therefore, it is necessary to adequately characterize soils by applying standardized or alternative methods with a high level of precision. Diatomaceous soils are the product of sedimentation of fossilized frustules. They have a high silica content, a particle size ranging from nano to micro, and varied morphologies. These soils have particular properties, such as high porosity, low density, and great absorption capacity, and exhibit unusual geotechnical behavior. The distribution of particle sizes and its relationship with soil strength and compressibility have not been extensively studied. The distinctive nature and sizes of these particles necessitate identification and characterization through microscopic observation. In this study, we determined the particle size distribution of three diatomaceous soils of different origins (Colombia, Mexico, and Peru) and morphological characteristics using the traditional hydrometry method. These results were contrasted with the size distribution obtained from scanning electron microscopy (SEM) image processing and analysis. The goal of this study is to determine a possible correlation between the two methodologies so that size assessments can be performed efficiently and effectively. The results revealed differences between diatom species, and a significant numerical adjustment was established between the methods for samples of Colombian and Mexican origin.