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Use of indurated laterites and lateritic soils as ferro-kaolinites for the synthesis of geopolymer materials: a comparative study.

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Title: Use of indurated laterites and lateritic soils as ferro-kaolinites for the synthesis of geopolymer materials: a comparative study.
Authors: Tchekwagep, Jean Jacques Kouadjo1 (AUTHOR) mse_wanggg@ujn.edu.cn, Hseumou, Eva Lunine2 (AUTHOR), Tchakouté, Hervé Kouamo2,3 (AUTHOR) htchak@yahoo.fr, Wang, Ruoyu1 (AUTHOR), Tome, Sylvain3 (AUTHOR), Ding, Ning4 (AUTHOR), Rüscher, Claus Henning3 (AUTHOR), Hou, Pengkun1 (AUTHOR)
Source: Archives of Civil & Mechanical Engineering (Elsevier Science). Jul2026, Vol. 26 Issue 4, p1-44. 44p.
Subjects: Laterite, Compressive strength, Mössbauer spectroscopy, Soils, Kaolin, Inorganic chemistry, Hematite
Abstract: Indurated laterites are hardened layers within the laterite profile containing a gravel component. Lateritic soils, on the other hand, are the finer-grained material forming the uppermost part of the laterite profile, lacking the gravel component. The objective of this research work is the comparison of the compressive strength and microscopic properties of geopolymers from lateritic soils and indurated laterites. Three samples of each type of laterite were calcined at 700 °C and used as ferro-kaolinites. The chemical reagent used is a sodium waterglass with a molar ratio of SiO2 to Na2O of 1.6. Chemical composition demonstrates that the Fe2O3 content in indurated laterites is between 36.46 and 37.60 wt. %. Fe2O3 ranges from 17.32 to 22.48 wt. % in lateritic soils. Compressive strengths of geopolymers from indurated laterites are 29.87, 49.63 and 57.17 MPa, while those from lateritic soils are 41.75, 43.21 and 44.51 MPa. From the 57Fe Mössbauer spectra, the relative proportions of hematite in the geopolymers using indurated laterites are 73.9, 72.1 and 64.4%. In contrast, the relative percentages of hematite for geopolymers from lateritic soils are 54.0, 33.8 and 26.9%. The mass percentages of coordinated Fe3+ in geopolymer materials from lateritic soils are 42.5, 29.0 and 15.5%, whereas those from indurated laterites are 6.8, 5.0 and 5.1%. It can be established that the values of compressive strength of the geopolymers from the indurated laterites are higher than those from the lateritic soils. In contrast to lateritic soils, the 57Fe Mössbauer results support a higher hematite and a lower coordinated Fe3+ content in the geopolymers derived from indurated laterites. [ABSTRACT FROM AUTHOR]
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Abstract:Indurated laterites are hardened layers within the laterite profile containing a gravel component. Lateritic soils, on the other hand, are the finer-grained material forming the uppermost part of the laterite profile, lacking the gravel component. The objective of this research work is the comparison of the compressive strength and microscopic properties of geopolymers from lateritic soils and indurated laterites. Three samples of each type of laterite were calcined at 700 °C and used as ferro-kaolinites. The chemical reagent used is a sodium waterglass with a molar ratio of SiO2 to Na2O of 1.6. Chemical composition demonstrates that the Fe2O3 content in indurated laterites is between 36.46 and 37.60 wt. %. Fe2O3 ranges from 17.32 to 22.48 wt. % in lateritic soils. Compressive strengths of geopolymers from indurated laterites are 29.87, 49.63 and 57.17 MPa, while those from lateritic soils are 41.75, 43.21 and 44.51 MPa. From the 57Fe Mössbauer spectra, the relative proportions of hematite in the geopolymers using indurated laterites are 73.9, 72.1 and 64.4%. In contrast, the relative percentages of hematite for geopolymers from lateritic soils are 54.0, 33.8 and 26.9%. The mass percentages of coordinated Fe3+ in geopolymer materials from lateritic soils are 42.5, 29.0 and 15.5%, whereas those from indurated laterites are 6.8, 5.0 and 5.1%. It can be established that the values of compressive strength of the geopolymers from the indurated laterites are higher than those from the lateritic soils. In contrast to lateritic soils, the 57Fe Mössbauer results support a higher hematite and a lower coordinated Fe3+ content in the geopolymers derived from indurated laterites. [ABSTRACT FROM AUTHOR]
ISSN:16449665
DOI:10.1007/s43452-026-01556-9