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Slag and Activator Chemistry Control the Reaction Kinetics of Sodium Metasilicate-Activated Slag Cements

Author

Listed:
  • Maria Criado

    (Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Sheffield S1 3JD, UK
    Eduardo Torroja Institute for Construction Sciences (IETcc-CSIC), Madrid 28033, Spain)

  • Brant Walkley

    (Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Sheffield S1 3JD, UK)

  • Xinyuan Ke

    (Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Sheffield S1 3JD, UK
    BRE Centre for Innovative Construction Materials, University of Bath, Bath BA2 7AY, UK)

  • John L. Provis

    (Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Sheffield S1 3JD, UK)

  • Susan A. Bernal

    (Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Sheffield S1 3JD, UK
    School of Civil Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK)

Abstract

The reaction kinetics of four commercial ground granulated blast furnace slags with varying percentages of MgO (6 to 14 wt.%), activated with four different doses of sodium metasilicate, were evaluated using isothermal calorimetry. The reaction kinetics were strongly dependent on the dose of the alkaline activator used, and the chemical and physical properties of the slag. When using low concentrations of sodium metasilicate as an activator, the MgO content in the slag influences the kinetics of the reaction, while the CaO content plays a more significant role when the concentration of metasilicate is increased. This study elucidated a close relationship between the dose of the alkali-activator and the chemistry of the slag used, although it was not possible to identify a clear correlation between any of the published chemically-based “slag quality moduli” and the calorimetry results, highlighting the complexity of blast furnace slag glass chemistry, and the importance of the physical properties of the slag in defining its reactivity.

Suggested Citation

  • Maria Criado & Brant Walkley & Xinyuan Ke & John L. Provis & Susan A. Bernal, 2018. "Slag and Activator Chemistry Control the Reaction Kinetics of Sodium Metasilicate-Activated Slag Cements," Sustainability, MDPI, vol. 10(12), pages 1-14, December.
    • Handle: RePEc:gam:jsusta:v:10:y:2018:i:12:p:4709-:d:189529
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    Citations

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    Cited by:

    1. Liang Jia & Li Zhang & Jian Guo & Kai Yao & Sin Mei Lim & Bin Li & Hui Xu, 2019. "Evaluation on Strength Properties of Lime–Slag Stabilized Loess as Pavement Base Material," Sustainability, MDPI, vol. 11(15), pages 1-15, July.
    2. Daniela Carolina Paz-Gómez & Inês Silveirinha Vilarinho & Silvia M. Pérez-Moreno & João Carvalheiras & José Luis Guerrero & Rui Miguel Novais & Maria Paula Seabra & Guillermos Ríos & Juan Pedro Bolíva, 2021. "Immobilization of Hazardous Wastes on One-Part Blast Furnace Slag-Based Geopolymers," Sustainability, MDPI, vol. 13(23), pages 1-18, December.

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