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http://dx.doi.org/10.14190/JRCR.2019.7.4.375

Buildability of 3D Printed Concrete Structures at Various Nozzle Speeds and Aspect Ratios  

Park, Ji-Hun (Department of Civil Engineering, Kunsan National University)
Lee, Jungwoo (Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Joh, Changbin (Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Yang, In-Hwan (Department of Civil Engineering, Kunsan National University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.7, no.4, 2019 , pp. 375-382 More about this Journal
Abstract
In this study, an experimental study on the buildability of the structure using the developed printing materials and equipment was performed. Experimental variables included the moving speed of nozzles(=80 and 100mm/s), the revolutions per minute (RPM) of screw in discharge buckets, and the aspect ratio(=1.67 and 5.00) reflecting wall length of the structures. Buildability of the 3D printed concrete structures was analyzed based on the maximum decomposition layer and collapse patterns of the structures according to the experimental variables. The nozzle movement speed of 80mm/s and the aspect ratio of 1.67 were favorable for 3D printing in this study. The collapse process of structure due to uneven layer decomposition was also analyzed through the relative displacement measurement of the lower part of the structure during printing.
Keywords
3D printing; Concrete; Buildability; Nozzle speed; Aspect ratio;
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