Analysis of calcareous sand particle shape using fourier descriptor analysis
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ORIGINAL RESEARCH
Open Access
Analysis of calcareous sand particle shape using fourier descriptor analysis Lamia Touiti1* , Taesik Kim2 and Young‑Hoon Jung3 *Correspondence: [email protected] 1 LGC Civil Engineering Laboratory ‑ Ecole Nationale d’Ingénieurs de Tunis, University of Tunis El Manar, Tunis, Tunisia Full list of author information is available at the end of the article
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 mor‑ phology 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 Mat‑ mata carbonate sands show higher roughness than Jumunjin’s silica sand. Keywords: Shape analysis, Fourier descriptor, Carbonate sand, Jumunjin sand, Dissa sand, Matmata sand
Introduction In Civil engineering literature, the mechanical behavior of sands is related to their microcharacteristics and particle morphology. Moreover, the variation of packing ability, compression properties, yielding, and stiffness parameters are interpreted as a function of absolute particle size and variability of grading, as well as their particle micro-characteristics (e.g.: [2, 8, 9, 13, 23, 27, 29]). 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, ultimately, the performance of the pavement layer. Therefore, the fundamental measurements of aggregate shape characteristics are essential for the high-quality control © The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as l
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