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Title |
Effect of Shrinkage Characteristics of Cement-Based Composites by Extrusion and Lamination Process of Construction 3D Printing
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Authors |
이호재(Hojae Lee) ; 김원우(Won-Woo Kim) ; 서은아(Eun-A Seo) ; 문재흠(Jae-Heum Moon) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.6.113 |
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Keywords |
3D 프린팅; 적층공법; 압축강도; 수축; 출력공정 3D printing; Additive manufacturing; Compressive strength; Shrinkage; Printing process |
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Abstract |
The purpose of this study is to evaluate the shrinkage characteristics of the cement-based composite for 3D printing construction, and to evaluate the shrinkage before/after extrusion and after printing during the printing process. As a result of evaluating the compressive strength by curing age of OPC-mix and printing-mix, similar trends were shown until 7 days of age, but the maximum shrinkage of 252 μm/m was larger in the case of OPC-mix compared to printing-mix. During the printing process, the compressive strength of the cementitious composite material after extrusion was about 6.5 MPa lower than the material before extrusion until the 7th day of age, but the level of strength on the 28th day of age was similar. As for the shrinkage characteristics, the result of shrinkage after printing showed greater shrinkage in the range of 220-260 μm/m compared to the result of shrinkage before extrusion.
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