적층시험체 제작 방식에 따른 시멘트계 복합재료의 적층성능 및 강도 특성 분석
Analysis of Buildability and Strength Characteristics of Cement-based Composite Materials by Manufacturing Method of Laminated Specimens
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초록
이 연구에서는 적층시험체 제작 방식에 따른 시멘트계 복합재료의 적층성능과 강도특성을 분석하였다. 레이어 높이에 따른 적층성능평가결과, 직선부과 곡선부에서 레이어 높이가 10 mm일 때 가장 높은 치수 안정성을 나타내었다. 몰드 타설 시험체와 Printing-Z 시험체의재령 28일 압축강도는 동일한 압축강도 성능을 나타내었다. 반면, Printing-X 시험체의 재령 28일 압축강도는 71.72 MPa로 가장 낮았으며, 몰드 제작 시험체와 Printing-Z시험체 대비 평균 8%가 낮은 압축강도를 나타내었다. 적층시험체의 쪼갬인장강도는 몰드 제작 시험체와 유사한성능을 나타낼 수 있으나, 하중 가력방향에 대한 레이어의 방향과 시험체 내 레이어의 개수에 따라 10% 이상의 강도성능 저하현상이 나타날 수있다. X-ray CT 분석을 통한 적층시험체의 계면 분석결과, 레이어의 계면을 따라 일정한 크기의 공극이 분포함을 확인하였다.
Abstract
In this study, the lamination performance and strength characteristics of cement-based composite materials according to the laminated specimens manufacturing method were analyzed. As a result of evaluating the buildability according to the layer height, the highest dimensional stability was shown when the layer height was 10 mm in all parts. The mold casting specimen and the printing-Z specimen showed the same compressive strength performance at the age of 28 days. On the other hand, the compressive strength at 28 day of printing-X specimen was the lowest at 71.72 MPa, and 8% lower than that of the mold casting specimen and the printing-Z specimen. The split tensile strength of the laminated specimen may show similar performance to that of the mold casting specimen, but the strength performance may decrease by more than 10% depending on the direction of the layer and the number of layers in the specimen. As a result of the interface analysis of the laminated specimen through X-ray CT analysis, it was confirmed that pores of a certain size were distributed along the interface of the layer.
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