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<p>This study investigates the chemical composition, microstructure, and thermophysical performance of compressed red earth bricks reinforced with argan nut shell fibers at varying contents (0–30 wt%). The objective is to assess the suitability of this natural reinforcement for improving the thermal efficiency of sustainable earthen construction materials. Scanning Electron Microscopy revealed uniform fiber dispersion and increased porosity at higher fiber contents, while XRF and EDX analyses confirmed the incorporation of organic components through increased carbon content and reduced mineral oxides (Si, Al, Ca, Fe). Thermophysical parameters—thermal conductivity, volumetric and specific heat capacity, thermal diffusivity, and thermal effusivity—were measured between 20&#xa0;° C and 50&#xa0;° C. Results show a progressive reduction in thermal conductivity (up to 20%) and diffusivity (26%) with increasing fiber content, indicating an enhanced insulation effect. Statistical analyses (Type III ANOVA and Tukey HSD) confirmed that both fiber content and temperature significantly influenced all measured parameters. These findings highlight the potential of argan shell fibers as sustainable additives for thermally efficient, low-impact earthen construction materials.</p>

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Thermophysical performance of compressed red earth bricks incorporating argan nut shell fibers for sustainable construction applications

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Karima Ouaazizi,
  • Abderrahim Samaouali,
  • Randa Bakari,
  • Fatima Kanibou,
  • Asmae Arbaoui

摘要

This study investigates the chemical composition, microstructure, and thermophysical performance of compressed red earth bricks reinforced with argan nut shell fibers at varying contents (0–30 wt%). The objective is to assess the suitability of this natural reinforcement for improving the thermal efficiency of sustainable earthen construction materials. Scanning Electron Microscopy revealed uniform fiber dispersion and increased porosity at higher fiber contents, while XRF and EDX analyses confirmed the incorporation of organic components through increased carbon content and reduced mineral oxides (Si, Al, Ca, Fe). Thermophysical parameters—thermal conductivity, volumetric and specific heat capacity, thermal diffusivity, and thermal effusivity—were measured between 20 ° C and 50 ° C. Results show a progressive reduction in thermal conductivity (up to 20%) and diffusivity (26%) with increasing fiber content, indicating an enhanced insulation effect. Statistical analyses (Type III ANOVA and Tukey HSD) confirmed that both fiber content and temperature significantly influenced all measured parameters. These findings highlight the potential of argan shell fibers as sustainable additives for thermally efficient, low-impact earthen construction materials.