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Title |
Structural Stability in Concrete 3D Printing Construction
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Authors |
홍성걸(Sung-gul Hong) ; 박지슬(Ji-seul Park) ; 김남희(Nam-hee Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2018.30.4.345 |
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Keywords |
구조안정성 ; 3D 프린팅 콘크리트 ; 한계파괴응력 ; 형상지수 ; 중공단면 structural stability ; 3D printing concrete ; critical failure stress ; geometrical parameter ; hollow section |
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Abstract |
In concrete 3-D printing, it is important to control parameters for structural stability during construction. Such parameters include properties of fresh concrete-shear strength and critical yield stress. In this study, a geometrical parameter has been used to relate structural shape to the compression-resisting capacity. Some different shapes of hollow cross section have been tested under compression by varying thickness, height, centerline perimeter of extruded filament. Experimental results provided useful information so that some important measures for structural safety for 3-D printing construction are identified. The fracture initiation time was estimated by scrutinizing shape behavior with very fine time intervals. And geometrical parameter of each specimen was thereby obtained by calculating the shear strength and the critical stress right before the failure. This paper shows that the parameter can be used as a measure for the structural safety of and its value is related to the cross-sectional area and centerline perimeter of extruded filament. Finally this paper suggests that the fracture onset time could be chosen as a failure indicator relating with the geometrical parameter.
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