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As the tide retreats, large quantities of seaweed are left stranded along the coastline, and the resulting accumulation of marine macroalgae presents a serious environmental concern. This study investigates the potential large-scale use of stranded macroalgae in building materials. Specifically, it explores the impact of incorporating seaweed at varying proportions in both lightweight and structural cob. A thorough analysis of earthen wall samples was performed to assess their compressive strength and hygrothermal properties. For lightweight earth, improvements were observed in thermal storage capacity and conductivity, without compromising compressive strength. The optimal seaweed content was found to be 20%, leading to a 26% reduction in thermal conductivity compared to traditional cob. The addition of algae significantly enhanced both the mechanical and hygrothermal performance of the cob, allowing for reduced wall thickness. These findings support the development of eco-friendly, sustainable, and energy-efficient building materials.

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Characterization of Earth-Based Construction Incorporating Stranded Algae: Mechanical and Hygrothermal Properties

  • 会议论文

  • 发表日期：

    2025年

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  • Yassine El Mandili,
  • Fouad Boukhelf,
  • Mohammed Hichem Benzaama,
  • Badreddine El Haddaji

摘要

As the tide retreats, large quantities of seaweed are left stranded along the coastline, and the resulting accumulation of marine macroalgae presents a serious environmental concern. This study investigates the potential large-scale use of stranded macroalgae in building materials. Specifically, it explores the impact of incorporating seaweed at varying proportions in both lightweight and structural cob. A thorough analysis of earthen wall samples was performed to assess their compressive strength and hygrothermal properties. For lightweight earth, improvements were observed in thermal storage capacity and conductivity, without compromising compressive strength. The optimal seaweed content was found to be 20%, leading to a 26% reduction in thermal conductivity compared to traditional cob. The addition of algae significantly enhanced both the mechanical and hygrothermal performance of the cob, allowing for reduced wall thickness. These findings support the development of eco-friendly, sustainable, and energy-efficient building materials.