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<p>Stabilizing CEBs with geopolymer binder is more eco-friendly than Portland cement, which emits high CO₂. However, geopolymer production remains energy-intensive due to the calcination process required for some aluminosilicate precursors. This study aims to improve the engineering and durability properties of CEBs through alkali activation without the use of calcined aluminosilicate. Laterite-based CEBs were activated with a 12&#xa0;M NaOH solution at mass contents of 0 to 20%. After 45&#xa0;days of curing (7&#xa0;days in laboratory at 30 ± 5&#xa0;°C, 14&#xa0;days under black polyane film at 40 ± 5&#xa0;°C, and 24&#xa0;days sun-dried in open air), physico-mechanical and durability tests were conducted. The properties of CEBs were improved at higher alkali content. The 20% NaOH-treated CEB exhibited optimal performance: density of 1659&#xa0;kg/m<sup>3</sup>, dry compressive strength of 4.3&#xa0;MPa, abrasion resistance of 18.4&#xa0;g/cm<sup>2</sup>, and eroded area of 0.86%. Alkali-activation effectively strengthens CEBs while reducing environmental impact compared to cement stabilization.</p> Graphical abstract <p></p>

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Improvement of the performance of compressed earth blocks (CEBs) through alkali-activation of lateritic earth cured in the ambient sub-Saharan climate

  • 期刊论文

  • 发表日期：

    2025年4月21日

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  • Seick Omar Sore,
  • Philbert Nshimiyimana,
  • Souleymane Ouedraogo,
  • Kader Banaou Djibo,
  • Diatto Kevin Namoulniara,
  • Mamounata Semde,
  • Abdoulaye Sana,
  • Adamah Messan

摘要

Stabilizing CEBs with geopolymer binder is more eco-friendly than Portland cement, which emits high CO₂. However, geopolymer production remains energy-intensive due to the calcination process required for some aluminosilicate precursors. This study aims to improve the engineering and durability properties of CEBs through alkali activation without the use of calcined aluminosilicate. Laterite-based CEBs were activated with a 12 M NaOH solution at mass contents of 0 to 20%. After 45 days of curing (7 days in laboratory at 30 ± 5 °C, 14 days under black polyane film at 40 ± 5 °C, and 24 days sun-dried in open air), physico-mechanical and durability tests were conducted. The properties of CEBs were improved at higher alkali content. The 20% NaOH-treated CEB exhibited optimal performance: density of 1659 kg/m3, dry compressive strength of 4.3 MPa, abrasion resistance of 18.4 g/cm2, and eroded area of 0.86%. Alkali-activation effectively strengthens CEBs while reducing environmental impact compared to cement stabilization.

Graphical abstract