Weak Bond Strength Between Successive Layers in Extrusion-Based Additive Manufacturing (2019-06)¶

Measurement and Physical Origin

10.1016/j.cemconres.2019.105787

Keita Emmanuel, Bessaies-Bey Hela, Zuo Wenqiang, Belin Patrick, Roussel Nicolas
Journal Article - Cement and Concrete Research, Vol. 123

Abstract

Requirements on material properties for extrusion-based additive manufacturing mostly focus on the rheological behavior of the cementitious material being printed. The layer interface strength is therefore often considered to result from a proper mixing or remixing of two consecutive layers induced by the deposition process itself and therefore from the material thixotropic behavior. We show however here that, in the case of smooth interfaces, the drop in interface strength finds its origin in the water evaporation from the free surface occurring during the short time interval between two successive layers. Our results and their analysis within the framework of drying physics suggest that the water loss is localized in a dry region at the free surface leading to an incomplete cement hydration and high local porosity. We moreover compare here various experimental protocols allowing for the assessment of a drop in bond strength.

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7 References

188 Citations

BibTeX

@article{keit_bess_zuo_beli.2019.WBSBSLiEBAM,
  author            = "Emmanuel Keita and Hela Bessaies-Bey and Wenqiang Zuo and Patrick Belin and Nicolas Roussel",
  title             = "Weak Bond Strength Between Successive Layers in Extrusion-Based Additive Manufacturing: Measurement and Physical Origin",
  doi               = "10.1016/j.cemconres.2019.105787",
  year              = "2019",
  journal           = "Cement and Concrete Research",
  volume            = "123",
}

Formatted Citation

IEEE

E. Keita, H. Bessaies-Bey, W. Zuo, P. Belin and N. Roussel, “Weak Bond Strength Between Successive Layers in Extrusion-Based Additive Manufacturing: Measurement and Physical Origin”, Cement and Concrete Research, vol. 123, 2019, doi: 10.1016/j.cemconres.2019.105787.

CMOS

Keita, Emmanuel, Hela Bessaies-Bey, Wenqiang Zuo, Patrick Belin, and Nicolas Roussel. “Weak Bond Strength Between Successive Layers in Extrusion-Based Additive Manufacturing: Measurement and Physical Origin”. Cement and Concrete Research 123 (2019). https://doi.org/10.1016/j.cemconres.2019.105787.