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Consumption of calcium hydroxide and formation of C–S–H in cement pastes

Influence of the addition of a spent FCC catalyst (Ecat)

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Abstract

The pozzolanic properties of the equilibrium catalyst (Ecat), an abundant waste from fluid catalytic cracking units of oil refineries, have been studied in cementitious matrices. The consumption of calcium hydroxide is usually taken as a means to assess the pozzolanicity of a material, ignoring the formation of C–S–H and other hydrates, the main product of the pozzolanic reaction. The use of thermal analysis methods allows the identification and quantification of the products of the hydration reaction, based on the loss of chemically combined water of phases present in a cementitious matrix. In the present study, TG/DTG techniques were used to quantify the amount of C–S–H + ettringite, C–A–S–H + C–A–H, and calcium hydroxide in cement–Ecat pastes, containing 0–40 % Ecat, aged for 1–28 days. The influence of the content of these phases on the mechanical properties of the resulting samples was also investigated by axial compression. The results further confirmed the pozzolanic activity of Ecat, so that the production of C–S–H and C–A–S–H increased with the aging time, but in a smaller amount than in the reference paste. The compressive strength test showed that the pastes containing 10 % Ecat, aged for 14 and 28 days, presented improved properties as compared to the corresponding references.

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Acknowledgements

The authors are grateful to CAPES, CNPq, and FAPESB for the scholarships and financial support.

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Authors and Affiliations

  1. Escola Politécnica, Centro Interdisciplinar de Energia e Ambiente (Cienam), Universidade Federal da Bahia, Rua Aristide Novis, s/n, Campus da Federação, Salvador, Bahia, 40210-630, Brazil

    Francisco Gabriel Santos Silva & Jardel Pereira Gonçalves

  2. Centro de Ciências Exatas e Tecnológicas (CETEC), Universidade Federal do Recôncavo da Bahia, Campus Universitário, Cruz das Almas, Bahia, 44380-000, Brazil

    Francisco Gabriel Santos Silva

  3. Laboratório de Catálise e Materiais (LABCAT), Instituto de Química, Departamento de Química Geral e Inorgânica, Universidade Federal da Bahia, Rua Barão de Jeremoabo, s/n, Campus de Ondina, Salvador, Bahia, 40170-280, Brazil

    Raildo Alves Fiuza Junior, Jefferson Santos da Silva, Carlos Magno S. R. de Brito & Heloysa Martins Carvalho Andrade

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  1. Francisco Gabriel Santos Silva
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  2. Raildo Alves Fiuza Junior
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  6. Jardel Pereira Gonçalves
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Correspondence to Jardel Pereira Gonçalves.

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Silva, F.G.S., Fiuza Junior, R.A., da Silva, J.S. et al. Consumption of calcium hydroxide and formation of C–S–H in cement pastes. J Therm Anal Calorim 116, 287–293 (2014). https://doi.org/10.1007/s10973-013-3546-9

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  • DOI: https://doi.org/10.1007/s10973-013-3546-9

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