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<p>Owing to the unique features of soft interfaces around short fibers and other particulate components in the fiber-reinforced granular composites, their percolation behavior representing the interfacial connectivity is commonly considered as a crucial parameter influencing the macroscopic performance of materials and its specific value is closely dependent on the spatial pattern and geometric shape of these fibers. In this work, a numerical study on the percolation of ITZ (i.e., interfacial transition zone which is a kind of soft interface phase in concrete) in both ordinary fiber-reinforced mortar (OFRM) and aligned fiber-reinforced mortar (AFRM) is conducted based on computer numerical simulation. Firstly, by simplifying the short fibers and fine aggregates in mortar as the spherocylindrical and spheroidal particles, respectively, the three-dimensional (3D) mesoscale models of mortars are generated. By combining these models with a commonly used method for continuum percolation, the ITZ percolation thresholds in different systems are approximately derived based on the percolation probability, and the effects of the characteristics of both fibers and aggregates on the ITZ percolation thresholds in OFRM and AFRM are investigated in detail. The results show that the ITZ percolation threshold for AFRM is always greater than that for OFRM and their difference becomes more obvious as the content and aspect ratio of fibers increase or the effective fiber width decreases. By coupling the obtained results with the linear regression method, the approximately empirical formulas of ITZ percolation thresholds for both OFRM and AFRM are proposed and their reliabilities are also validated. According to these proposed formulas, the predicted ranges of ITZ percolation threshold for OFRM and AFRM in practical engineering are, respectively, 0.074 ~ 0.386 and 0.096 ~ 0.397, and the maximum increased rate is up to 30.7%, which further proves the significance of the alignment of fibers. The above studies can provide sound guidance for the design and evaluation of the transport and mechanical properties of fiber-reinforced materials in the field of concrete materials.</p> Graphical Abstract <p></p>

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A numerical study on the interface percolation in fiber-reinforced granular composite based on non-spherical particle packing models: Effect of spatial pattern of fibers

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Jianjun Lin,
  • Sibo Wang,
  • Qingxin Zhao,
  • Huisu Chen

摘要

Owing to the unique features of soft interfaces around short fibers and other particulate components in the fiber-reinforced granular composites, their percolation behavior representing the interfacial connectivity is commonly considered as a crucial parameter influencing the macroscopic performance of materials and its specific value is closely dependent on the spatial pattern and geometric shape of these fibers. In this work, a numerical study on the percolation of ITZ (i.e., interfacial transition zone which is a kind of soft interface phase in concrete) in both ordinary fiber-reinforced mortar (OFRM) and aligned fiber-reinforced mortar (AFRM) is conducted based on computer numerical simulation. Firstly, by simplifying the short fibers and fine aggregates in mortar as the spherocylindrical and spheroidal particles, respectively, the three-dimensional (3D) mesoscale models of mortars are generated. By combining these models with a commonly used method for continuum percolation, the ITZ percolation thresholds in different systems are approximately derived based on the percolation probability, and the effects of the characteristics of both fibers and aggregates on the ITZ percolation thresholds in OFRM and AFRM are investigated in detail. The results show that the ITZ percolation threshold for AFRM is always greater than that for OFRM and their difference becomes more obvious as the content and aspect ratio of fibers increase or the effective fiber width decreases. By coupling the obtained results with the linear regression method, the approximately empirical formulas of ITZ percolation thresholds for both OFRM and AFRM are proposed and their reliabilities are also validated. According to these proposed formulas, the predicted ranges of ITZ percolation threshold for OFRM and AFRM in practical engineering are, respectively, 0.074 ~ 0.386 and 0.096 ~ 0.397, and the maximum increased rate is up to 30.7%, which further proves the significance of the alignment of fibers. The above studies can provide sound guidance for the design and evaluation of the transport and mechanical properties of fiber-reinforced materials in the field of concrete materials.

Graphical Abstract