A Comparative Evaluation of Sepiolite and Nano-Montmorillonite on the Rheology of Cementitious Materials for 3D Printing (2022-08)¶

10.1016/j.conbuildmat.2022.128935

Aydin Eylül, Kara Burhan, Bundur Zeynep, Özyurt Nilüfer, Bebek Özkan, Gulgun Mehmet
Journal Article - Construction and Building Materials, Vol. 350

Abstract

Through the last decade, methods of digital manufacturing of concrete gained a significant interest compared to conventional concrete. The main challenge in additive manufacturing (3D printing) is to design a highly thixotropic cementitious system. This study aims to investigate the use of sepiolite as a rheology modifier as a novel approach to improve the thixotropic behavior and adapt cementitious systems to 3D printing. To understand the influence of sepiolite on rheological properties, a comparative evaluation with nano-montmorillonite was established. The effectiveness of clay addition was also investigated in fly-ash amended cement-based materials. The rheological analysis was done on cement-paste samples containing both clays in terms of their effects on thixotropy, structural build-up, and recovery. A preliminary printability assessment was done with a lab scale printer having a ram extruder. The results show that the incorporation of clays increased the dynamic yield stress and time-dependent evolution of static yield stress. Moreover, the addition of clays improved the thixotropic behavior of cement-based systems, particularly those containing fly-ash. Herein, the sepiolite was found to be more effective compared to nano-montmorillonite in terms of improving thixotropy, structural build-up and recovery. The results showed that use of fly-ash enhances the printability of the mix for the specified extruder and the samples containing 1% nano-montmorillonite or 0.5% sepiolite can be printed. The positive effects of sepiolite were attributed to opposing surface charges of the clay layers and its micro-fibrous microstructure. The findings in this study enabled an in-depth understanding of the rheology and printability of fly-ash amended clay containing printable cement-based mortars.

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23 References

25 Citations

BibTeX

@article{aydi_kara_bund_ozyu.2022.ACEoSaNMotRoCMf3P,
  author            = "Eylül Mina Aydin and Burhan Kara and Zeynep Başaran Bundur and Nilüfer Özyurt and Özkan Bebek and Mehmet Ali Gulgun",
  title             = "A Comparative Evaluation of Sepiolite and Nano-Montmorillonite on the Rheology of Cementitious Materials for 3D Printing",
  doi               = "10.1016/j.conbuildmat.2022.128935",
  year              = "2022",
  journal           = "Construction and Building Materials",
  volume            = "350",
}

Formatted Citation

IEEE

E. M. Aydin, B. Kara, Z. B. Bundur, N. Özyurt, Ö. Bebek and M. A. Gulgun, “A Comparative Evaluation of Sepiolite and Nano-Montmorillonite on the Rheology of Cementitious Materials for 3D Printing”, Construction and Building Materials, vol. 350, 2022, doi: 10.1016/j.conbuildmat.2022.128935.

CMOS

Aydin, Eylül Mina, Burhan Kara, Zeynep Başaran Bundur, Nilüfer Özyurt, Özkan Bebek, and Mehmet Ali Gulgun. “A Comparative Evaluation of Sepiolite and Nano-Montmorillonite on the Rheology of Cementitious Materials for 3D Printing”. Construction and Building Materials 350 (2022). https://doi.org/10.1016/j.conbuildmat.2022.128935.