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Title |
The Buildability and Strength Properties of 3D Printed Concrete in the Air and Underwater Environment
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Authors |
서은아(Eun-A Seo) ; 이호재(Ho-Jae Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2024.28.2.35 |
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Keywords |
3D 프린팅; 수중; 적층성능; 겉보기 밀도; 압축강도 3D Printing; Underwater; Buildability; Apparent density; Compressive strength |
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Abstract |
This study evaluated the buildability and mechanical properties of 3DP concrete printed in air and underwater environments. Buildability was evaluated by green strength test on fresh concrete and height and deflection immediately and 1 hour after printing. The green compressive strength of the concrete was 5.0 kPa after 30 minutes and 7.9 kPa after 3 hours, an increase of 1.6 times the initial strength. The total height of the laminated parts met the design height regardless of the printing environment. The amount of deflection in air and under water 1 hour after printing was 1 mm and 0.2 mm, respectively, indicating a small amount of deflection under water. The apparent density of the sample appeared in the order of A-M > A-P > UW-P. This is believed to be because a large amount of air is mixed into the concrete during the printing process, and water infiltrates during the underwater printing process. The compressive strength ratio of UW-P/A-P was 0.86 at 1 day, but the compressive strength of the underwater printed concrete was high from 7 days.
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