Rheology of 3D Printable Lightweight Foam-Concrete Incorporating Nano-Silica (2019-09)¶

10.1007/978-3-030-22566-7_43

Cho Seung, Kruger Jacques, van Rooyen Algurnon, Zeranka Stephan, van Zijl Gideon
Contribution - Proceedings of the 2^nd International RILEM Conference on Rheology and Processing of Construction Materials and the 9^th International RILEM Symposium on Self-Compacting Concrete, pp. 373-381

Abstract

Lightweight foam concrete (LWFC) has relatively high workability, or low static and dynamic shear resistance in the fresh state. It is also sensitive to applied pressure. These limitations present challenges for 3D printing of LWFC, through its pumping and extrusion, and bearing pressure of subsequent layers. The associated risks of 3D printing LWFC is therefore twofold, altering the LWFC properties during the printing process, and insufficient buildability. Inclusion of appropriate nanoparticles, with high surface area to volume ratio, is proposed here to influence the microstructure of the cementitious composite in the fresh and hardened state, in order to increase the shear resistance, and limit the impact of the 3D printing process on its density. Nano-SiO2 (nS) particles with a diameter smaller than 30 nm and 99.5% purity are incorporated into LWFC at 2% and 3% by weight of cement. Rheometer results indicate increased shear resistance and thixotropic behavior. Conservative buildability prediction based on the thixotropic properties is validated by 3D printed nLWFC building height of a circular hollow column.

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2 References

27 Citations

BibTeX

@inproceedings{cho_krug_rooy_zera.2019.Ro3PLFCINS,
  author            = "Seung Cho and Jacques Pienaar Kruger and Algurnon Steve van Rooyen and Stephan Zeranka and Gideon Pieter Adriaan Greeff van Zijl",
  title             = "Rheology of 3D Printable Lightweight Foam-Concrete Incorporating Nano-Silica",
  doi               = "10.1007/978-3-030-22566-7_43",
  year              = "2019",
  volume            = "23",
  pages             = "373--381",
  booktitle         = "Proceedings of the 2nd International RILEM Conference on Rheology and Processing of Construction Materials and the 9th International RILEM Symposium on Self-Compacting Concrete",
  editor            = "Viktor Mechtcherine and Kamal H. Khayat and Egor Secrieru",
}

Formatted Citation

IEEE

S. Cho, J. P. Kruger, A. S. van Rooyen, S. Zeranka and G. P. A. G. van Zijl, “Rheology of 3D Printable Lightweight Foam-Concrete Incorporating Nano-Silica”, in Proceedings of the 2^nd International RILEM Conference on Rheology and Processing of Construction Materials and the 9^th International RILEM Symposium on Self-Compacting Concrete, 2019, vol. 23, pp. 373–381. doi: 10.1007/978-3-030-22566-7_43.

CMOS

Cho, Seung, Jacques Pienaar Kruger, Algurnon Steve van Rooyen, Stephan Zeranka, and Gideon Pieter Adriaan Greeff van Zijl. “Rheology of 3D Printable Lightweight Foam-Concrete Incorporating Nano-Silica”. In Proceedings of the 2^nd International RILEM Conference on Rheology and Processing of Construction Materials and the 9^th International RILEM Symposium on Self-Compacting Concrete, edited by Viktor Mechtcherine, Kamal H. Khayat, and Egor Secrieru, 23:373–81, 2019. https://doi.org/10.1007/978-3-030-22566-7_43.