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<p>Sand concrete (SC) offers a sustainable alternative in the construction industry by addressing environmental, technical, and economic challenges, particularly using recycled materials. Limestone fillers, which play a key role in enhancing the compactness and mechanical performance of SC, can be partially or fully replaced by recycled fillers to improve sustainability. In this study, recycled concrete filler (RF) and recycled brick filler (RB) were investigated as substitutes for limestone filler in SC mixtures intended for paving applications, with replacement levels of 0%, 25%, 50%, 75%, and 100%. A Simplex-Centroid Design approach was employed to optimize mixture proportions and evaluate the effects of recycled fillers on workability and compressive strength. The results indicate that both RF and RB significantly influence the fresh and hardened properties of SC. The developed predictive models exhibited a high overall desirability value of 0.94 for workability and 28-day compressive strength, demonstrating the potential of recycled fillers to enhance both the performance and sustainability of sand concrete for paving applications.</p>

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Synergistic effect of recycled fillers on sand concrete performance: a statistical modelling approach

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Ikram Souici,
  • Leila Zeghichi,
  • Zied Benghazi

摘要

Sand concrete (SC) offers a sustainable alternative in the construction industry by addressing environmental, technical, and economic challenges, particularly using recycled materials. Limestone fillers, which play a key role in enhancing the compactness and mechanical performance of SC, can be partially or fully replaced by recycled fillers to improve sustainability. In this study, recycled concrete filler (RF) and recycled brick filler (RB) were investigated as substitutes for limestone filler in SC mixtures intended for paving applications, with replacement levels of 0%, 25%, 50%, 75%, and 100%. A Simplex-Centroid Design approach was employed to optimize mixture proportions and evaluate the effects of recycled fillers on workability and compressive strength. The results indicate that both RF and RB significantly influence the fresh and hardened properties of SC. The developed predictive models exhibited a high overall desirability value of 0.94 for workability and 28-day compressive strength, demonstrating the potential of recycled fillers to enhance both the performance and sustainability of sand concrete for paving applications.