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<p>Managing ash from biomass combustion is a significant environmental challenge, while the construction industry is increasingly seeking sustainable alternatives to traditional, energy-intensive binders. This study evaluates the potential of two types of biomass ash (BA-a and BA-b) as eco-friendly stabilizing agents for making compressed earth bricks (CEBs), focusing on how hygrothermal curing conditions influence their long-term performance. The experimental program involved adding these ashes in different proportions (0, 5, 10, 15, and 20% by weight) into soil to produce stabilized CEBs, labeled BBA-a(X%) and BBA-b(X%). The specimens were cured under controlled hygrothermal conditions (40&#xa0;°C and 100% RH) for 7, 28, 60, and 180&#xa0;days, then tested for mechanical, thermal, and durability properties. The results reveal different behaviors depending on the type of biomass ash used. BA-b exhibits strong pozzolanic activity, significantly improving mechanical performance, with a maximum compressive strength of 33.34&#xa0;MPa at 180&#xa0;days for 20% addition, compared to 11.60&#xa0;MPa for the control bricks at the same age. Conversely, BA-a primarily enhances thermal performance, achieving a thermal conductivity as low as 0.722 W/m·K at 20% addition after 180&#xa0;days, versus 0.952 W/m·K for the control bricks. The data clearly demonstrate the gradual activation of pozzolanic reactions under hygrothermal curing, with notable performance enhancements between 28 and 180&#xa0;days. This study highlights the positive impact of hygrothermal conditions in accelerating the development of mechanical and thermal properties in biomass-ash-stabilized CEBs. Overall, the findings support using biomass ashes as effective, eco-friendly stabilizers for producing high-quality CEBs, especially suitable for construction in hot and humid environments.</p>

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Impact of storage under high temperature and relative humidity on the properties of compressed earth bricks stabilized with biomass ash

  • 期刊论文

  • 发表日期：

    2026年1月11日

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  • Nadia Boussaa,
  • Nasser Chelouah,
  • Nordine Leklou,
  • Fatma Kheloui

摘要

Managing ash from biomass combustion is a significant environmental challenge, while the construction industry is increasingly seeking sustainable alternatives to traditional, energy-intensive binders. This study evaluates the potential of two types of biomass ash (BA-a and BA-b) as eco-friendly stabilizing agents for making compressed earth bricks (CEBs), focusing on how hygrothermal curing conditions influence their long-term performance. The experimental program involved adding these ashes in different proportions (0, 5, 10, 15, and 20% by weight) into soil to produce stabilized CEBs, labeled BBA-a(X%) and BBA-b(X%). The specimens were cured under controlled hygrothermal conditions (40 °C and 100% RH) for 7, 28, 60, and 180 days, then tested for mechanical, thermal, and durability properties. The results reveal different behaviors depending on the type of biomass ash used. BA-b exhibits strong pozzolanic activity, significantly improving mechanical performance, with a maximum compressive strength of 33.34 MPa at 180 days for 20% addition, compared to 11.60 MPa for the control bricks at the same age. Conversely, BA-a primarily enhances thermal performance, achieving a thermal conductivity as low as 0.722 W/m·K at 20% addition after 180 days, versus 0.952 W/m·K for the control bricks. The data clearly demonstrate the gradual activation of pozzolanic reactions under hygrothermal curing, with notable performance enhancements between 28 and 180 days. This study highlights the positive impact of hygrothermal conditions in accelerating the development of mechanical and thermal properties in biomass-ash-stabilized CEBs. Overall, the findings support using biomass ashes as effective, eco-friendly stabilizers for producing high-quality CEBs, especially suitable for construction in hot and humid environments.