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<p>The unique hybrid structure of crab shell waste offers opportunities for sustainable ceramics. This study investigates crab shell waste incorporation as a multifunctional additive in clay bricks at 0&#xa0;% to 15&#xa0;% replacement rates. The material appears to act through a dual mechanism: its organic chitin serves as a sacrificial porogenic agent, while its mineral fraction could act as a reactive flux. Samples were fired at 850&#xa0;°C to 900&#xa0;°C. Multi-scale characterization suggests a “Special Coupling” mechanism: 15&#xa0;% CSW (Crab Shell Waste) bricks fired at 900&#xa0;°C exhibit 8.71&#xa0;MPa compressive strength and 228.8 mW·(m·K)<sup>−1</sup> thermal conductivity, representing 19.5&#xa0;% better insulation while meeting structural standards. This synergy could be explained by a pore-sealing effect where reactive CaO would promote matrix densification. This approach valorizes local marine waste, supporting a circular economy model for the Mediterranean region. These findings demonstrate CSW’s potential as a sustainable additive for energy-efficient construction in Mediterranean regions, contributing to circular waste management strategies and cleaner production in the ceramic industry.</p>

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Crab Shell Waste in Sustainable Clay Bricks: A Dual Mechanism of Pore Formation and Reactive Sealing for Improved Thermal and Mechanical Performance

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Zina Sdiri,
  • Ali Bennour,
  • Paulo Santos,
  • Daniel Ferrández,
  • Nicoletta Fusi,
  • Samira Arroum,
  • Wissem Gallala

摘要

The unique hybrid structure of crab shell waste offers opportunities for sustainable ceramics. This study investigates crab shell waste incorporation as a multifunctional additive in clay bricks at 0 % to 15 % replacement rates. The material appears to act through a dual mechanism: its organic chitin serves as a sacrificial porogenic agent, while its mineral fraction could act as a reactive flux. Samples were fired at 850 °C to 900 °C. Multi-scale characterization suggests a “Special Coupling” mechanism: 15 % CSW (Crab Shell Waste) bricks fired at 900 °C exhibit 8.71 MPa compressive strength and 228.8 mW·(m·K)−1 thermal conductivity, representing 19.5 % better insulation while meeting structural standards. This synergy could be explained by a pore-sealing effect where reactive CaO would promote matrix densification. This approach valorizes local marine waste, supporting a circular economy model for the Mediterranean region. These findings demonstrate CSW’s potential as a sustainable additive for energy-efficient construction in Mediterranean regions, contributing to circular waste management strategies and cleaner production in the ceramic industry.