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<p>This study experimentally investigated the effect of bauxite residue (BR) content on the production and mechanical performance of synthetic coarse aggregates (SAGs). Once considered an environmental liability, this residue has increasingly been recognized as a sustainable alternative for several engineering applications. SAGs were produced with 70%, 80%, and 90% BR, referred to as SAG-70, SAG-80, and SAG-90, and their performance was evaluated by water absorption, impact (shock) loss, and Los Angeles abrasion tests, as well as compressive strength, tensile strength, and elastic modulus, in comparison with pebble aggregates (PB). The results showed that lower BR contents led to lower water absorption; accordingly, SAG-70 exhibited water absorption nearly equivalent to that of PB while achieving higher compressive performance, with statistically significant differences relative to PB and to the other SAG groups. In addition, SAG exhibited higher abrasion resistance than PB, and despite higher water demand, no significant differences in tensile strength were observed among the groups. Thus, these findings confirm the strong potential and technical feasibility of using bauxite-residue-based aggregates in structural concrete, reducing dependence on natural aggregates and promoting sustainable waste valorization in the aluminum and construction industries.</p>

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Mechanical performance of concrete with synthetic coarse aggregates derived from bauxite residue

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月12日

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  • Aaron Nzambi,
  • Marcella Ribeiro,
  • Robson Fernandes,
  • Luciano Farias,
  • Aedjota Jesus,
  • Marcelo Picanço,
  • Deivison Guerreiro

摘要

This study experimentally investigated the effect of bauxite residue (BR) content on the production and mechanical performance of synthetic coarse aggregates (SAGs). Once considered an environmental liability, this residue has increasingly been recognized as a sustainable alternative for several engineering applications. SAGs were produced with 70%, 80%, and 90% BR, referred to as SAG-70, SAG-80, and SAG-90, and their performance was evaluated by water absorption, impact (shock) loss, and Los Angeles abrasion tests, as well as compressive strength, tensile strength, and elastic modulus, in comparison with pebble aggregates (PB). The results showed that lower BR contents led to lower water absorption; accordingly, SAG-70 exhibited water absorption nearly equivalent to that of PB while achieving higher compressive performance, with statistically significant differences relative to PB and to the other SAG groups. In addition, SAG exhibited higher abrasion resistance than PB, and despite higher water demand, no significant differences in tensile strength were observed among the groups. Thus, these findings confirm the strong potential and technical feasibility of using bauxite-residue-based aggregates in structural concrete, reducing dependence on natural aggregates and promoting sustainable waste valorization in the aluminum and construction industries.