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<p>This study assesses comparison between acid and alkaline activations of powders of two raw laterite samples denoted as B and P respectively for Compressed Earth Blocks (CEB) issue. For this purpose, phosphoric acid solutions of P<sub>2</sub>O<sub>5</sub> / H<sub>2</sub>O molar ratio 0.06, 0.09, 0.12 and 0.15 and alkaline solutions in which NaOH molarities were 6,8,10 and 12&#xa0;M were used as activators. Depending on both the raw materials and activated products, the following analytical techniques and characteristics were performed: chemical and thermal analyses, FTIR spectroscopy, XRD, SEM, particle size distribution, plasticity, linear shrinkage, flexural strength, and durability. Raw laterite (B) at the laterization stage was found to be more reactive than at the kaolinization stage (P) in both media. No matter the lateritic sample, increase in either NaOH concentration or P<sub>2</sub>O<sub>5</sub> / H<sub>2</sub>O molar ratios caused high dissolution of reactive entities. However, increase in flexural strength (3.19 to 5.23 and 3.24 to 3.92&#xa0;MPa for samples B and P respectively) for alkali activated CEB and decrease in flexural strength (3.43 to 2.61 and 2.02 to 1.76&#xa0;MPa for samples B and P respectively) for acid activated CEB are achieved due to water content. Moreover, both activated CEB were found to be stable in water after 24&#xa0;h of immersion. Hence, raw laterites activated with either acid or alkaline solution can be used for the production of Compressed Earth Blocks for engineering purposes.</p>

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Acid and Alkaline Activations of Raw Laterites Cured at Ambient Temperature: A Comparative Study

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Monique Michèle Ngo Bitty,
  • Jean Baenla,
  • Vivien Igor Banzouzi Samba,
  • Jean Jacques Madiba Mboka,
  • Marchand Joseph Manga Dika,
  • Antoine Elimbi

摘要

This study assesses comparison between acid and alkaline activations of powders of two raw laterite samples denoted as B and P respectively for Compressed Earth Blocks (CEB) issue. For this purpose, phosphoric acid solutions of P2O5 / H2O molar ratio 0.06, 0.09, 0.12 and 0.15 and alkaline solutions in which NaOH molarities were 6,8,10 and 12 M were used as activators. Depending on both the raw materials and activated products, the following analytical techniques and characteristics were performed: chemical and thermal analyses, FTIR spectroscopy, XRD, SEM, particle size distribution, plasticity, linear shrinkage, flexural strength, and durability. Raw laterite (B) at the laterization stage was found to be more reactive than at the kaolinization stage (P) in both media. No matter the lateritic sample, increase in either NaOH concentration or P2O5 / H2O molar ratios caused high dissolution of reactive entities. However, increase in flexural strength (3.19 to 5.23 and 3.24 to 3.92 MPa for samples B and P respectively) for alkali activated CEB and decrease in flexural strength (3.43 to 2.61 and 2.02 to 1.76 MPa for samples B and P respectively) for acid activated CEB are achieved due to water content. Moreover, both activated CEB were found to be stable in water after 24 h of immersion. Hence, raw laterites activated with either acid or alkaline solution can be used for the production of Compressed Earth Blocks for engineering purposes.