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Title |
Evaluation of Fluidity Over Time and Mechanical Properties of Cement-based Composite Materials for 3D Printing
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Authors |
서은아(Eun-A Seo) ; 이호재(Ho-Jae Lee) ; 양근혁(Keun-Hyeok Yang) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.4.73 |
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Keywords |
콘크리트 3D 프린팅; 레올로지; 경시변화; 압축강도; 쪼갬인장강도 Concrete 3D printing; Rheology; Elapsed time; Compressive strength; Splitting tensile strength |
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Abstract |
This study evaluated changes in fluidity and rheological properties over time for 3D printed composite materials, and evaluated compressive strength and splitting tensile strength properties for laminated and molded specimens. The composite material for 3D printing starts to change rapidly after 30 minutes of extrusion, and the viscosity of the material tends to be maintained up to 90 minutes, but it was confirmed that construction within 60 minutes after mixing is effective. The compressive strength of the laminated test specimen showed equivalent or better performance at all ages compared to the molded test specimen. In the stress-strain curve of the laminated specimen, the initial slope was similar to that of the molded specimen, but the descending slope was on average 1.9 times higher than that of the molded specimen, indicating relatively brittle behavior. The splitting tensile strength of the P-V laminated specimen was about 6% lower than that of the molded specimen. It is judged that this is because the interfacial adhesion force against the vertical load is affected by the pattern direction of the laminated test specimen.
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