건설용 3D 프린팅 압출 및 적층공정에 따른 시멘트계 복합재료의 수축 특성 영향
Effect of Shrinkage Characteristics of Cement-Based Composites by Extrusion and Lamination Process of Construction 3D Printing
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초록
본 연구의 목적은 적층 시공을 위해 개발한 시멘트계 복합재료 배합의 수축특성을 평가하며, 출력공정 중 압출 전/후, 적층 후의 수축을 평가하는데 있다. OPC배합과 프린팅 배합의 재령별 압축강도를 평가한 결과 재령 7일까지 유사한 경향을 보였으나, OPC 배합의 경우 프린팅 배합과 비교하여 최대 252 ㎛/m 수축이 더 크게 나타났다. 출력공정 중 압출 후 재료의 압축강도는 압출 전 재료보다 재령 7일차까지 약 6.5 MPa 낮았으나, 재령 28일에는 동등 수준의 강도가 발현되었다. 수축특성은 적층 이후 재료의 수축 측정 결과 압출 전 재료와 비교하여 220-260 ㎛/m 범위로 수축이 더 크게 나타났다.
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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