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Effects of Extrusion-Parameters on Properties of 3D Printing Concrete with Coarse Aggregates (2022-02)

10.1016/j.conbuildmat.2022.126740

Ji Guangchao,  Xiao Jianzhuang,  Zhi Peng,  Wu Yuching, Han Nv
Journal Article - Construction and Building Materials, Vol. 325

Abstract

Different extrusion systems have been widely used in previous studies, researches on the influence of nozzle directions and scrapers on properties of 3D printing concrete (3DPC) were however very limited. Therefore, the buildability, mechanical properties, and microstructure of concrete printed by different nozzle directions and scrapers were studied in this investigation. It has been found that the vertical extrusion force would reduce buildability, whereas increase the mechanical properties of 3DPC. Microstructure indicates that the interlayer porosity of concrete printed by vertical nozzle is 79.8% of that printed by horizontal nozzle. Besides, compared with the vertical nozzle without scraper (VN), the vertical nozzle with 40 mm-height scrapers (VN-40S) could reduce the vertical deformation of 3DPC by 20%−25% and increase the flexural strength parallel to the printing direction of 3DPC by 44%–49%. The interlayer porosity of concrete printed by VN-40S is 70.1% of that printed by VN. Longer scrapers could influence more printed layer fresh concrete, so the porosity is further reduced. Finally, a discrete element method (DEM) and automatic scraper system are discussed for the future work of 3DPC.

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BibTeX 
@article{ji_xiao_zhi_wu.2022.EoEPoPo3PCwCA,
  author            = "Guangchao Ji and Jianzhuang Xiao and Peng Zhi and Yuching Wu and Nv Han",
  title             = "Effects of Extrusion-Parameters on Properties of 3D Printing Concrete with Coarse Aggregates",
  doi               = "10.1016/j.conbuildmat.2022.126740",
  year              = "2022",
  journal           = "Construction and Building Materials",
  volume            = "325",
}
Formatted Citation

G. Ji, J. Xiao, P. Zhi, Y. Wu and N. Han, “Effects of Extrusion-Parameters on Properties of 3D Printing Concrete with Coarse Aggregates”, Construction and Building Materials, vol. 325, 2022, doi: 10.1016/j.conbuildmat.2022.126740.

Ji, Guangchao, Jianzhuang Xiao, Peng Zhi, Yuching Wu, and Nv Han. “Effects of Extrusion-Parameters on Properties of 3D Printing Concrete with Coarse Aggregates”. Construction and Building Materials 325 (2022). https://doi.org/10.1016/j.conbuildmat.2022.126740.