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<p>This study explores the potential of <i>Posidonia oceanica</i> marine biomass as a sustainable and low-cost reinforcement for cement-based composites intended for building applications. Two distinct forms of <i>Posidonia oceanica</i> fibers—leaves (POL) and balls (POB)—were incorporated into a cement matrix in both raw and boiled states, allowing a comparative assessment of fiber type and thermal treatment effects. The influence of boiling treatment on the chemical structure, morphology, and crystallinity of POL and POB fibers was first examined using FTIR, SEM, and XRD analyses. Cementitious composites were then manufactured with fiber volume fractions ranging from 0 to 20%, and their mechanical (flexural and compressive strengths) and thermo-physical properties (density, thermal conductivity, thermal diffusivity, and specific heat capacity) were evaluated. Results show that the incorporation of raw <i>Posidonia oceanica</i> fibers enhances the flexural strength of cement composites compared to the reference matrix, with optimal values of 4.2&#xa0;MPa for POL at 15% volume fraction and 5.8&#xa0;MPa for POB at 10% volume fraction. Boiling treatment significantly modifies the fiber surface, leading to higher composite density and improved compressive strength, particularly for POB-reinforced composites. In terms of thermal performance, the addition of both POL and POB fibers reduces thermal conductivity and diffusivity, indicating improved insulation properties, with POL-based composites exhibiting the lowest thermal conductivity values. Furthermore, composites containing boiled fibers exhibit higher specific heat capacity at intermediate fiber contents, highlighting their potential for thermal energy storage. Overall, this work provides a comprehensive comparative analysis of <i>Posidonia oceanica</i> fiber type and treatment in cement-based composites, demonstrating their relevance for sustainable building materials that combine mechanical performance and thermal insulation.</p>

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Effect of posidonia-oceanica fiber type on mechanical and thermal performance of cement matrix composite for building applications

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Lamis Allègue,
  • Insaf Mehrez,
  • Houda Hachem,
  • Imed Marzoug,
  • Foued Mzali,
  • Mondher Zidi

摘要

This study explores the potential of Posidonia oceanica marine biomass as a sustainable and low-cost reinforcement for cement-based composites intended for building applications. Two distinct forms of Posidonia oceanica fibers—leaves (POL) and balls (POB)—were incorporated into a cement matrix in both raw and boiled states, allowing a comparative assessment of fiber type and thermal treatment effects. The influence of boiling treatment on the chemical structure, morphology, and crystallinity of POL and POB fibers was first examined using FTIR, SEM, and XRD analyses. Cementitious composites were then manufactured with fiber volume fractions ranging from 0 to 20%, and their mechanical (flexural and compressive strengths) and thermo-physical properties (density, thermal conductivity, thermal diffusivity, and specific heat capacity) were evaluated. Results show that the incorporation of raw Posidonia oceanica fibers enhances the flexural strength of cement composites compared to the reference matrix, with optimal values of 4.2 MPa for POL at 15% volume fraction and 5.8 MPa for POB at 10% volume fraction. Boiling treatment significantly modifies the fiber surface, leading to higher composite density and improved compressive strength, particularly for POB-reinforced composites. In terms of thermal performance, the addition of both POL and POB fibers reduces thermal conductivity and diffusivity, indicating improved insulation properties, with POL-based composites exhibiting the lowest thermal conductivity values. Furthermore, composites containing boiled fibers exhibit higher specific heat capacity at intermediate fiber contents, highlighting their potential for thermal energy storage. Overall, this work provides a comprehensive comparative analysis of Posidonia oceanica fiber type and treatment in cement-based composites, demonstrating their relevance for sustainable building materials that combine mechanical performance and thermal insulation.