Abstract
The macroscopic properties of loess soils are significantly controlled by their microstructure. However, researches on the microstructure of loess soils at micrometer scale are inadequate, especially in the aspect of quantitative analysis of three-dimensional (3D) microstructure. This study systematically investigates the micrometer-scale microstructure of loess soils from Jingyang, Shaanxi province, China, via X-ray computed tomography and explored image segmentation method. The microstructural characteristics, including size, shape, and arrangement of particle and pore, were discussed from the real 3D view and quantitatively analyzed by statistical method. Results showed that the representative elementary volume obtained through porosity is applicable to microstructural parameters of size distribution, shape factor, orientation angle, and pore connectivity. Sectional analysis revealed that the two-dimensional (2D) results of size, shape, arrangement, and pore connectivity cannot adequately represent the corresponding 3D characteristics. These works may provide insight for researches on the microstructure of similar particulate materials. • The micrometer-scale microstructure of loess soils was analyzed from real 3D view. • REV obtained from porosity is applicable to quantitative microstructure analysis. • 2D size, arrangement, shape, and pore connectivity cannot represent 3D characteristics.
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