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<p>The sustainable utilization of natural resources in construction materials has become increasingly important, emphasizing the need for locally available and cost-effective raw materials. This study evaluates the potential of two natural clays from Zaghouan, North-East Tunisia, designated as A1 and A2, for fired brick production. Geotechnical, structural, and thermal analyses revealed distinct properties: A1 exhibits low plasticity, while A2 is highly plastic. Both clays contain sufficient sand content, eliminating the need for supplementary sand in formulations. A mixture design was employed to optimize the proportions of A1 and A2 at firing temperatures of 800&#xa0;°C and 900&#xa0;°C, examining their effects on mechanical strength and volume shrinkage. The optimal composition, comprising 60% A1 and 40% A2 fired at 800&#xa0;°C, produced bricks meeting quality standards for fired clay products. This study demonstrates the feasibility of using these local clays as sustainable materials for brick manufacturing. The findings offer an economical and eco-friendly alternative to traditional formulations, reducing reliance on additional natural resources, lowering energy consumption, and advancing the valorization of local resources in Tunisia.</p>

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Optimization of fired clay brick manufacturing using mixture design: application to Zaghouan clays, Tunisia

  • 期刊论文

  • 发表日期：

    2025年7月25日

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  • Rakia S’habou,
  • Assia Boukhili,
  • Ali Ellouze,
  • Hassib Tounsi

摘要

The sustainable utilization of natural resources in construction materials has become increasingly important, emphasizing the need for locally available and cost-effective raw materials. This study evaluates the potential of two natural clays from Zaghouan, North-East Tunisia, designated as A1 and A2, for fired brick production. Geotechnical, structural, and thermal analyses revealed distinct properties: A1 exhibits low plasticity, while A2 is highly plastic. Both clays contain sufficient sand content, eliminating the need for supplementary sand in formulations. A mixture design was employed to optimize the proportions of A1 and A2 at firing temperatures of 800 °C and 900 °C, examining their effects on mechanical strength and volume shrinkage. The optimal composition, comprising 60% A1 and 40% A2 fired at 800 °C, produced bricks meeting quality standards for fired clay products. This study demonstrates the feasibility of using these local clays as sustainable materials for brick manufacturing. The findings offer an economical and eco-friendly alternative to traditional formulations, reducing reliance on additional natural resources, lowering energy consumption, and advancing the valorization of local resources in Tunisia.