Abstract
Soil particle shape analysis was conducted on two calcareous sands from Dissa and Matmata in Tunisia and one silica sand from Jumunjin in Korea using an image analysis method. This technique uses complex Fourier shape descriptors and image analysis of sand grains SEM photographs to provide accurate quantification of particle morphology and texture. The Fourier descriptors, denoted “Signature Descriptors”, provide measures of Elongation, Triangularity, Squareness, and Asymmetry and identify the overall shape of soil particles. A summary of higher-order descriptors provides textural information linked up to local roughness and texture characteristics. After analyzing the Fourier descriptors, elongation was found to be the major characteristics of the three sands, mainly for the Dissa and Matmata carbonate sands. In addition, the elongation signature descriptors for the Dissa and Matmata sands have very high values compared to those of Ras Alkhair (Saudi Arabia) and Dog’s bay (Ireland) sands. Therefore, the Dissa and Matmata carbonate sands have higher angles of friction and higher critical state angle of friction than Ras Alkhair and Dog’s bay sands. Furthermore, the Dissa and Matmata carbonate sands show higher roughness than Jumunjin’s silica sand.
Highlights
In Civil engineering literature, the mechanical behavior of sands is related to their microcharacteristics and particle morphology
According to Kandhal and Parker [18], Saeed et al [25] and Meininger [20], the form, angularity, and texture of fine, and coarse aggregate particles used in hot-mix asphalt (HMA), hydraulic cement concrete, and unbound base and subbase layers influence their mutual interactions and interactions with any stabilizing agents and are related to durability, workability, shear resistance, tensile strength, stiffness, fatigue response, optimum stabilizer content, and, the performance of the pavement layer
The particles of carbonate sands vary in size and shape, producing well-graded distribution curves, whereas silica sands have generally a uniform grade
Summary
In Civil engineering literature, the mechanical behavior of sands is related to their microcharacteristics and particle morphology. According to Kandhal and Parker [18], Saeed et al [25] and Meininger [20], the form, angularity, and texture of fine, and coarse aggregate particles used in hot-mix asphalt (HMA), hydraulic cement concrete, and unbound base and subbase layers influence their mutual interactions and interactions with any stabilizing agents (e.g., asphalt, cement, and lime) and are related to durability, workability, shear resistance, tensile strength, stiffness, fatigue response, optimum stabilizer content, and, the performance of the pavement layer. The skeletal particles of carbonate sands are varied and diverse in their size, shape, and ability to resist mechanical and chemical effects. The particles of carbonate sands vary in size and shape, producing well-graded distribution curves, whereas silica sands have generally a uniform grade
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