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<p>This study investigates the preparation and characterization of geopolymer binders incorporating a high proportion of construction wastes, namely bauxite brick residue and quartz stone powder, as aluminosilicate sources. Geopolymer formulations were developed with a constant metakaolin content of 10 wt% while varying the proportions of bauxite brick waste (70–90 wt%) and quartz powder (0–20 wt%), resulting in Si/Al molar ratios ranging from 1.53 to 3.85. The effects of quartz addition on the physical, mechanical, and microstructural properties of the synthesized geopolymers were evaluated. The results indicate that all formulations led to the formation of consolidated geopolymer matrices cured at ambient temperature. An optimal composition containing 10 wt% quartz and a Si/Al ratio of 2.16 exhibited a compressive strength of 58.28&#xa0;MPa after 28 days, along with a bulk density of 2.40&#xa0;g/cm<sup>3</sup> and a porosity of 12.45%. The findings demonstrate the feasibility of significantly reducing metakaolin content through the incorporation of industrial construction wastes, thereby promoting resource conservation and reducing the environmental impact associated with the production of geopolymer binders.</p>

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High-content construction waste geopolymers based on bauxite brick residues and quartz stone powder: synthesis, mechanical and microstructural properties

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Meriem Aggoun,
  • Farouk Benali,
  • Ahmed Benkhelif,
  • Hocine Osmani,
  • Mohamed Hamidouche,
  • Hammoudi Abderazek

摘要

This study investigates the preparation and characterization of geopolymer binders incorporating a high proportion of construction wastes, namely bauxite brick residue and quartz stone powder, as aluminosilicate sources. Geopolymer formulations were developed with a constant metakaolin content of 10 wt% while varying the proportions of bauxite brick waste (70–90 wt%) and quartz powder (0–20 wt%), resulting in Si/Al molar ratios ranging from 1.53 to 3.85. The effects of quartz addition on the physical, mechanical, and microstructural properties of the synthesized geopolymers were evaluated. The results indicate that all formulations led to the formation of consolidated geopolymer matrices cured at ambient temperature. An optimal composition containing 10 wt% quartz and a Si/Al ratio of 2.16 exhibited a compressive strength of 58.28 MPa after 28 days, along with a bulk density of 2.40 g/cm3 and a porosity of 12.45%. The findings demonstrate the feasibility of significantly reducing metakaolin content through the incorporation of industrial construction wastes, thereby promoting resource conservation and reducing the environmental impact associated with the production of geopolymer binders.