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Reuse of kaolinitic waste as a precursor of pozzolanic material

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Abstract

The replacement of cement with supplementary cementitious materials has great potential for mitigating CO2 emissions, as it leads to a lesser clinker production. One of the materials that can be used as a precursor of pozzolanic material is the by-product of a Brazilian industrial beneficiation process of kaolin, which is considered as a kaolinitic waste (KW), but still having a high kaolinite content. The calcination of the waste forms a product (CKW) consisting largely of metakaolinite (MK), which pozzolanic activity is known. Thus, the objective of this work was to study the calcination of KW, to evaluate the pozzolanic activity of CKW in Portland cement type II (PC) pastes with cement substitution degrees of 10, 20 and 30%, chosen based on the results of compaction essays of CKW/PC dry mixtures. Hydration was evaluated using isothermal calorimetry and also through thermogravimetry (TG) of pastes at different times of hydration. From the calorimetric tests, it was observed that as the CKW content added to the pastes was increased, the hydration reactions were accelerated and the heat released in relation to the reference paste containing only cement with water was increased as well. Through the TG results, it was noted that the increase in the replacement content and hydration time generated a greater amount of hydrated products and a greater consumption of calcium hydroxide, due to the pozzolanic action of CKW. The compressive strength of the pastes was evaluated at 3 and 28 days of curing, observing that at 28 days all the substitutions presented resistances higher than that of the reference paste, with direct correlation with the degrees of compaction of respective dry PC/CKW mixtures.

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Authors and Affiliations

  1. Sustainable Materials Laboratory‑NUMATS, Civil Engineering Department, COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil

    Bruna Luiza Ferreira Brito

  2. Thermal Analysis Laboratory, Department of Inorganic Processes, School of Chemistry, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil

    Bruna Luiza Ferreira Brito & Jo Dweck

Authors
  1. Bruna Luiza Ferreira Brito
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  2. Jo Dweck
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Correspondence to Bruna Luiza Ferreira Brito.

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Brito, B.L.F., Dweck, J. Reuse of kaolinitic waste as a precursor of pozzolanic material. J Therm Anal Calorim 147, 6087–6097 (2022). https://doi.org/10.1007/s10973-021-10957-2

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  • DOI: https://doi.org/10.1007/s10973-021-10957-2

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