Development of Cementitious Metamaterial with Compressive Strain-Hardening Characteristics (2022-06)¶

10.1007/978-3-031-06116-5_21

Nishijo Keisuke, Ohno Motohiro, Ishida Tetsuya
Contribution - Proceedings of the 3^rd RILEM International Conference on Concrete and Digital Fabrication, pp. 139-144

Abstract

The aim of this study is to fabricate a cementitious metamaterial with compressive strain-hardening characteristics by directly 3D printing fiber reinforced cement mortar. The internal structure of the metamaterial was designed such that vertical and horizontal elliptical holes were hollowed out alternately from a rectangular prism. This structure was intended to “squeeze” inward when compressed even after cracking. To validate the conceptual design, specimens were prepared by using two methods: casting fiber reinforced cement mortar in 3D printed plastic molds and directly printing fiber reinforced mortar by an extrusion-based 3D mortar printer. The hollowed specimens, as well as a control cast specimen without holes, were subjected to compression testing, and the surface strain was measured by using Digital Image Correlation. The test result showed that the load first increased almost linearly with the increase of deformation, followed by 76% load drop at the onset of the first crack. After the load drop, the load increased again, instead of showing brittle failure, and could recover up to 76% of the peak. When compared with the filled specimen, the hollowed cast specimen showed significantly larger deformation capacity with 14 times larger energy absorption due to the post-peak strain hardening behavior. On the other hand, the hollowed 3D-printed specimen showed the strain-softening behavior after the peak load, which could be attributed to the lack of accuracy in printing the elliptical holes. Nevertheless, significantly high energy absorption could be achieved in the printed specimen as well.

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BibTeX

@inproceedings{nish_ohno_ishi.2022.DoCMwCSHC,
  author            = "Keisuke Nishijo and Motohiro Ohno and Tetsuya Ishida",
  title             = "Development of Cementitious Metamaterial with Compressive Strain-Hardening Characteristics",
  doi               = "10.1007/978-3-031-06116-5_21",
  year              = "2022",
  volume            = "37",
  pages             = "139--144",
  booktitle         = "Proceedings of the 3rd RILEM International Conference on Concrete and Digital Fabrication: Digital Concrete 2022",
  editor            = "Richard A. Buswell and Ana Blanco and Sergio Cavalaro and Peter Kinnell",
}

Formatted Citation

IEEE

K. Nishijo, M. Ohno and T. Ishida, “Development of Cementitious Metamaterial with Compressive Strain-Hardening Characteristics”, in Proceedings of the 3^rd RILEM International Conference on Concrete and Digital Fabrication: Digital Concrete 2022, 2022, vol. 37, pp. 139–144. doi: 10.1007/978-3-031-06116-5_21.

CMOS

Nishijo, Keisuke, Motohiro Ohno, and Tetsuya Ishida. “Development of Cementitious Metamaterial with Compressive Strain-Hardening Characteristics”. In Proceedings of the 3^rd RILEM International Conference on Concrete and Digital Fabrication: Digital Concrete 2022, edited by Richard A. Buswell, Ana Blanco, Sergio Cavalaro, and Peter Kinnell, 37:139–44, 2022. https://doi.org/10.1007/978-3-031-06116-5_21.