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Carbonation of Concrete Slurry Waste and Its Use as Supplementary Cementitious Material

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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

Concrete slurry waste is generated at concrete plants and generally re-used in new batches of concretes. Due to the presence of hydrated cement paste it has the potential to be carbonated prior to re-use in order not only to store CO2, but also to enhance its reactivity. In this study, a concrete waste slurry obtained at a ready-mix concrete plant was investigated. For accelerated carbonation, a wet process in laboratory scale was used. The carbonated product was dried afterwards, characterized and used as supplementary cementitious material. When carbonated, the hydrate phases of the concrete waste slurry decomposed to calcite, gypsum and a silica-alumina gel. When blended with Portland cement (30% replacement by mass) early hydration kinetics was accelerated by the carbonated concrete slurry waste. The pozzolanic reaction of the silica-alumina gel consumed a significant part of the portlandite and showed a positive contribution to compressive strength compared to inert quartz powder and to the uncarbonated concrete slurry.

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Acknowledgements

The Swiss Federal Office of Energy and the Swiss Federal Office for the Environment are acknowledged for partly funding this study within the framework of the "DemoUpCarma" project, and Kästli Bau AG, Rubigen (Switzerland) for providing the concrete slurry waste. The authors thank Boris Ingold, Daniel Käppeli and Beat Münch for their support in the laboratory.

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Authors and Affiliations

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

    Frank Winnefeld & Andreas Leemann

  2. Neustark AG, Freiburgstrasse 251, 3018, Bern, Switzerland

    Johannes Tiefenthaler

  3. School of Geography and Environmental Sciences, Ulster University, Coleraine, UK

    Andreas Leemann

Authors
  1. Frank Winnefeld
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  2. Johannes Tiefenthaler
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  3. Andreas Leemann
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Corresponding author

Correspondence to Frank Winnefeld .

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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Winnefeld, F., Tiefenthaler, J., Leemann, A. (2023). Carbonation of Concrete Slurry Waste and Its Use as Supplementary Cementitious Material. 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_52

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  • DOI: https://doi.org/10.1007/978-3-031-33187-9_52

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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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