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http://dx.doi.org/10.14190/JRCR.2018.6.3.174

Structural Behavior of 3D Printed Concrete Specimens with Reinforcement  

Joh, Changbin (Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Lee, Jungwoo (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.6, no.3, 2018 , pp. 174-181 More about this Journal
Abstract
This paper examines the structural behavior of 3D printed concrete specimens with focus on the bond between the layers. The tensile bond and flexural strengths were investigated experimentally and compared with those of specimens made by conventional mold casting. The test parameters were the time gap between printing layers and the reinforcement between vertical layers. The results showed the 3D printed specimens had voids between layers and confirmed the strength reduction due to printing time gap and the stress concentration caused by the voids. Most of the reduction in tensile bond strength between layers was due to the stress concentration at least up to certain printing time gap. Moreover, beyond a certain printing time gap (24hours), the additional reduction in tensile bond strength reached a level that could affect the structural behavior. The reinforcement between layers was helpful to increase the ductile behavior which is essential to prevent the sudden collapse of the structure. In addition, the reduction in flexural strength due to the stress concentration by the voids was observed and should be considered in the design of 3D printed wall structures against the lateral load.
Keywords
3D Concrete Printing; Printing time gap; Stress concentration; Tensile bond behavior; Reinforcement;
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