Aligned Inter-Layer Fiber-Reinforcement and Post-Tensioning as a Reinforcement-Strategy for Digital Fabrication (2020-07)¶

10.1007/978-3-030-49916-7_63

Gebhard Lukas, Mata-Falcón Jaime, Anton Ana-Maria, Burger Joris, Lloret-Fritschi Ena, Reiter Lex, Dillenburger Benjamin, Gramazio Fabio, Kohler Matthias, Flatt Robert, Kaufmann Walter
Contribution - Proceedings of the 2^nd RILEM International Conference on Concrete and Digital Fabrication, pp. 622-631

Abstract

Digital Fabrication with Concrete (DFC) brings many new possibilities for the design and production of concrete structures, promising to revolutionise the concrete construction industry. While technological and material challenges have already been overcome to a large extent, there is still a lack of sufficiently mature reinforcement solutions. Therefore, most digital technologies encounter difficulties in producing load-bearing concrete members. Fibre reinforced concrete (FRC) is one of the most promising reinforcing strategies for DFC due to its capability for producing complex geometries. In conventional FRC, the fibres are dispersed randomly in the concrete matrix; for DFC applications this (i) forces to re-engineer the concrete processing (pumpability and rheology), and (ii) requires using very short and expensive fibres due to pumpability constraints. This paper presents a new reinforcement strategy for using FRC in layered DFC technologies that overcomes the stated limitations of conventional FRC. It consists in adding fibres right after the deposition of each layer of concrete in a controlled amount and orientation and providing a posttensioning reinforcement in the perpendicular direction. The mechanical behaviour, as well as the potential and first implementation steps in the Concrete Extrusion 3D Printing and Eggshell technologies under development at ETH Zurich, are discussed. The mechanical results show a significant increase in tensile resistance of the aligned interlayer fibre reinforcement compared to conventional FRC. However, for large-scale applications, the main loads still need to be carried by post-tensioning reinforcement.

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17 References

21 Citations

BibTeX

@inproceedings{gebh_mata_anto_burg.2020.AILFRaPTaaRSfDF,
  author            = "Lukas Gebhard and Jaime Mata-Falcón and Ana-Maria Anton and Joris Jan Burger and Ena Lloret-Fritschi and Lex Reiter and Benjamin Dillenburger and Fabio Gramazio and Matthias Daniel Kohler and Robert Johann Flatt and Walter Kaufmann",
  title             = "Aligned Inter-Layer Fiber-Reinforcement and Post-Tensioning as a Reinforcement-Strategy for Digital Fabrication",
  doi               = "10.1007/978-3-030-49916-7_63",
  year              = "2020",
  volume            = "28",
  pages             = "622--631",
  booktitle         = "Proceedings of the 2nd RILEM International Conference on Concrete and Digital Fabrication: Digital Concrete 2020",
  editor            = "Freek Paul Bos and Sandra Simaria de Oliveira Lucas and Robert Johannes Maria Wolfs and Theo A. M. Salet",
}

Formatted Citation

IEEE

L. Gebhard, “Aligned Inter-Layer Fiber-Reinforcement and Post-Tensioning as a Reinforcement-Strategy for Digital Fabrication”, in Proceedings of the 2^nd RILEM International Conference on Concrete and Digital Fabrication: Digital Concrete 2020, 2020, vol. 28, pp. 622–631. doi: 10.1007/978-3-030-49916-7_63.

CMOS

Gebhard, Lukas, Jaime Mata-Falcón, Ana-Maria Anton, Joris Jan Burger, Ena Lloret-Fritschi, Lex Reiter, Benjamin Dillenburger, et al.. “Aligned Inter-Layer Fiber-Reinforcement and Post-Tensioning as a Reinforcement-Strategy for Digital Fabrication”. In Proceedings of the 2^nd RILEM International Conference on Concrete and Digital Fabrication: Digital Concrete 2020, edited by Freek Paul Bos, Sandra Simaria de Oliveira Lucas, Robert Johannes Maria Wolfs, and Theo A. M. Salet, 28:622–31, 2020. https://doi.org/10.1007/978-3-030-49916-7_63.