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

IF 3.3 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Silicon Pub Date : 2025-03-10 DOI:10.1007/s12633-025-03279-7

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

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引用次数: 0

Abstract

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.

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生红土常温下酸、碱活化的比较研究

本研究评估了压缩土块（CEB）问题中两种红土原料样品粉末的酸碱性活性，分别记为B和P。为此，使用P2O5 / H2O摩尔比分别为0.06、0.09、0.12和0.15的磷酸溶液和NaOH摩尔浓度分别为6、8、10和12 M的碱性溶液作为活化剂。根据原料和活化产物，进行了以下分析技术和特征：化学和热分析，FTIR光谱，XRD， SEM，粒度分布，塑性，线性收缩率，抗弯强度和耐久性。在两种介质中，红土化阶段的原红土(B)比高岭土化阶段的活性更强。无论红土样品，NaOH浓度或P2O5 / H2O摩尔比的增加都会导致活性物质的高溶解。然而，由于水的含量，碱活化的CEB的抗弯强度增加（B和P样品分别为3.19 ~ 5.23和3.24 ~ 3.92 MPa），酸活化的CEB的抗弯强度降低（B和P样品分别为3.43 ~ 2.61和2.02 ~ 1.76 MPa）。此外，两种活化的CEB在水中浸泡24 h后均保持稳定。因此，用酸或碱性溶液活化的红土原料可用于生产用于工程目的的压缩土块。

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来源期刊

Silicon CHEMISTRY, PHYSICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.90

自引率

20.60%

发文量

685

审稿时长

>12 weeks

期刊介绍： The journal Silicon is intended to serve all those involved in studying the role of silicon as an enabling element in materials science. There are no restrictions on disciplinary boundaries provided the focus is on silicon-based materials or adds significantly to the understanding of such materials. Accordingly, such contributions are welcome in the areas of inorganic and organic chemistry, physics, biology, engineering, nanoscience, environmental science, electronics and optoelectronics, and modeling and theory. Relevant silicon-based materials include, but are not limited to, semiconductors, polymers, composites, ceramics, glasses, coatings, resins, composites, small molecules, and thin films.