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Effect of Carbonates on the Formation of Magnesium Silicate Hydrates (M-S-H) and Magnesium Alumino Silicate Hydrates (M-A-S-H)

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International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures (SynerCrete 2023)

Part of the book series: RILEM Bookseries ((RILEM,volume 44))

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Abstract

The effect of carbonates on the formation of magnesium silicate hydrate phases (M-S-H) and magnesium alumina-silicate hydrate phases (M-A-S-H) was investigated in paste experiments at a molar ratio Mg/Si = 1.5, an Al/Si ratio of either 0 or 1 and with and without addition of 1.7 wt. % Na2CO3. M-S-H pastes were synthesised from silica fume and MgO, while M-A-S-H pastes were synthesised from metakaolin and MgO. Thermogravimetric analyses, X-ray diffraction, and 29Si MAS NMR data showed that M-S-H and M-A-S-H phases formed much faster in the presence of sodium carbonate, which destabilised brucite. Furthermore, hydrotalcite formed in the presence of alumina. No evidence of the formation of Mg-carbonate phases in crystalline or amorphous form was observed. The MgO-metakaolin binder reached the highest compressive strength while the MgO-silica fume binder presented a slightly more than the half of the strength. By the addition of sodium carbonate compressive strengths could be improved for both systems.

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Authors and Affiliations

  1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Concrete and Asphalt, 8600, Dübendorf, Switzerland

    Ellina Bernard, Barbara Lothenbach, Alexander German & Frank Winnefeld

Authors
  1. Ellina Bernard
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  2. Barbara Lothenbach
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  3. Alexander German
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  4. Frank Winnefeld
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Corresponding author

Correspondence to Ellina Bernard .

Editor information

Editors and Affiliations

  1. Department of Structural Engineering, Silesian University of Technology, Gliwice, Poland

    Agnieszka Jędrzejewska

  2. Technical Specialist Services, Materials, ARUP, London, UK

    Fragkoulis Kanavaris

  3. ISISE, University of Minho, Guimaraes, Portugal

    Miguel Azenha

  4. Laboratoire de Mécanique Paris-Saclay, ENS Paris-Saclay, Gif-sur-Yvette, France

    Farid Benboudjema

  5. Institute of Structural Concrete, Graz University of Technology, Graz, Austria

    Dirk Schlicke

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Bernard, E., Lothenbach, B., German, A., Winnefeld, F. (2023). Effect of Carbonates on the Formation of Magnesium Silicate Hydrates (M-S-H) and Magnesium Alumino Silicate Hydrates (M-A-S-H). In: Jędrzejewska, A., Kanavaris, F., Azenha, M., Benboudjema, F., Schlicke, D. (eds) International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures. SynerCrete 2023. RILEM Bookseries, vol 44. Springer, Cham. https://doi.org/10.1007/978-3-031-33187-9_51

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  • DOI: https://doi.org/10.1007/978-3-031-33187-9_51

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-031-33186-2

  • Online ISBN: 978-3-031-33187-9

  • eBook Packages: EngineeringEngineering (R0)

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