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<p>Hematite is a mineral that does not dissolve during the geopolymerization, but instead acts as a micro-aggregate. The main goal of this researcher is to explore the compressive strength and microscopic structure of metakaolin-based geopolymers containing different levels of incorporated ferric ions. Ferric ion was obtained by dissolution of hematite in oxalic acid and nitric acid. Geopolymers were obtained by substituting metakaolin with varying amounts of ferric ions (0, 5, 10, 15, and 20&#xa0;g). Each formulation cured for 28&#xa0;days was subjected to compressive strength tests. The fragments were used to examine the microscopic pore structure. Other fragments were pulverized to monitor the mineralogical compositions in the geopolymers. The maximum compressive strength of 72.80&#xa0;MPa was attained by replacing the metakaolin with 5&#xa0;g of ferric ions. Macropores between 100 and 1000&#xa0;nm were absent from the cumulative and differential intrusion pore volume curves of the geopolymers after the incorporation of ferric ions. The EDS mapping reveals that Si, Al, O, and Na were abundant, with less Fe uniformly dispersed throughout the matrix. However, the mappings also indicate zones rich in Si and Al, as well as unreacted metakaolinite particles embedded in the matrices. Surface fractal dimensions indicate fractally smooth pore surfaces. It was found that the incorporation of fewer ferric ions into the geopolymers reduces the macropores content and promotes the development of compressive strength.</p>

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Effects of Incorporating Ferric Ions from Hematite into Metakaolin on Microscopic Pore Structures and Compressive Strength of Geopolymers

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • D. L. Vofo Ngnintedem,
  • Jean Jacques Kouadjo Tchekwagep,
  • A. Oumarou Amadou,
  • H. Kouamo Tchakouté,
  • Ruoyu Wang,
  • Fengzhen Yang,
  • Sylvain Tome,
  • C. Henning Rüscher,
  • Pengkun Hou

摘要

Hematite is a mineral that does not dissolve during the geopolymerization, but instead acts as a micro-aggregate. The main goal of this researcher is to explore the compressive strength and microscopic structure of metakaolin-based geopolymers containing different levels of incorporated ferric ions. Ferric ion was obtained by dissolution of hematite in oxalic acid and nitric acid. Geopolymers were obtained by substituting metakaolin with varying amounts of ferric ions (0, 5, 10, 15, and 20 g). Each formulation cured for 28 days was subjected to compressive strength tests. The fragments were used to examine the microscopic pore structure. Other fragments were pulverized to monitor the mineralogical compositions in the geopolymers. The maximum compressive strength of 72.80 MPa was attained by replacing the metakaolin with 5 g of ferric ions. Macropores between 100 and 1000 nm were absent from the cumulative and differential intrusion pore volume curves of the geopolymers after the incorporation of ferric ions. The EDS mapping reveals that Si, Al, O, and Na were abundant, with less Fe uniformly dispersed throughout the matrix. However, the mappings also indicate zones rich in Si and Al, as well as unreacted metakaolinite particles embedded in the matrices. Surface fractal dimensions indicate fractally smooth pore surfaces. It was found that the incorporation of fewer ferric ions into the geopolymers reduces the macropores content and promotes the development of compressive strength.