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Pozzolanic Reactivity of Low Grade Kaolinitic Clays: Influence of Mineralogical Composition

  • Adrián AlujasEmail author
  • Roger S. Almenares
  • Sergio Betancourt
  • Carlos Leyva
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 10)

Abstract

The influence of chemical and mineralogical composition of five Cuban clays in the pozzolanic reactivity of its calcination products is studied in this research. Raw materials were chemically and mineralogically characterized by XRF, XRD and TGA. Pozzolanic reactivity of 800 °C calcination products was evaluated by heat released in chemically modified lime-pozzolan pastes, and by compressive strength in mortars with a 30 % substitution of OPC by calcined clays. Preliminary results shown that pozzolanic reactivity of clays calcined at temperatures that guarantees a complete dehydroxylation of the raw materials could be qualitatively assessed by its relative positions along the diagonal trend in an Al2O3–SiO2–OH ternary plot, where pozzolanic reactivity is related to the percent of structural hydroxyl groups and the percent of Al2O3 in the raw material. Conducted pozzolanic reactivity test highlight the potential of kaolinite rich red clay soils as source for the obtaining of highly reactive pozzolanic materials.

Keywords

Compressive Strength Clay Mineral Mineralogical Composition Pozzolanic Reactivity Clay Sample 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Notes

Acknowledgments

The authors would like to thanks the valuable collaboration of Francois Avet on the performance of lime-pozzolan reactivity tests, and the Laboratoires des Matériaux de Construction (LMC) of the École Polytechnique Fédérale de Lausanne (EPFL) for offering their facilities. The authors would also like to acknowledge to the Cuban Geological Services, for the technical support in clay deposits sampling.

References

  1. 1.
    Njila, T., et al.: An overview of non-nickeliferous weathering crusts in Eastern Cuba. Mineria y Geología 26(2), 14–34 (2010)Google Scholar
  2. 2.
    Murray, H.H.: Traditional and new applications for kaolin, smectite, and palygorskite: a general overview. Appl. Clay Sci. 17(5–6), 207–221 (2000)CrossRefGoogle Scholar
  3. 3.
    Fernández López, R., Martirena Fernández, J.F., Scrivener, K.: The origin of the pozzolanic activity of calcined clay minerals: a comparison between kaolinite, illite and montmorillonita. Cem. Concr. Res. 41, 113–122 (2011)Google Scholar
  4. 4.
    Habert, G., et al.: Clay content of argillites: influence on cement based mortars. Appl. Clay Sci. 43(3–4), 322–330 (2009)CrossRefGoogle Scholar
  5. 5.
    He, C., Makovicky, E., Osbæck, B.: Thermal stability and pozzolanic activity of raw and calcined mixed-layer mica/smectite. Appl. Clay Sci. 17, 141–161 (2000)CrossRefGoogle Scholar
  6. 6.
    He, C., Osbaeck, B., Makovicky, E.: Pozzolanic reactions of six principal clay minerals: activation, reactivity assessments and technological effects. Cem. Concr. Res. 25(8), 1691–1702 (1995)CrossRefGoogle Scholar

Copyright information

© RILEM 2015

Authors and Affiliations

  • Adrián Alujas
    • 1
    Email author
  • Roger S. Almenares
    • 2
  • Sergio Betancourt
    • 3
  • Carlos Leyva
    • 2
  1. 1.Centro de Estudios de Química AplicadaUniversidad Central de Las VillasSanta ClaraCuba
  2. 2.Instituto Superior Minero-Metalúrgico de MoaHolguínCuba
  3. 3.Facultad de ConstruccionesUniversidad Central de Las VillasSanta ClaraCuba

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