Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Flexural Behavior of Layered RC Slabs, which Bio-Mimics the Interface of Shell Layers, Produced by Using 3D Printable Highly Ductile Cement Composite

3D 프린팅용 고연성 시멘트 복합체를 활용한 패류 껍질층 경계면 모방형 적층 RC 슬래브의 휨 거동

  • Received : 2024.01.28
  • Accepted : 2024.02.06
  • Published : 2024.02.28
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Abstract

In this study, we employed Highly Ductile Cement Composite (HDCC) to evaluate the flexural performance of a RC slab that simulates the laminating structure of a seashell. To evaluate flexural performance, we produced conventional RC slab specimens, HDCC slab specimens, and HDCC-M slab specimens which biomimics a seashell's layered structure by inserting PE mesh inside the slab made of HDCC. A series of 4-point bending tests were conducted. Experimental results shows the flexural strength of the HDCC-M slab specimen was 1.7 times and 1.2 times higher than that of the RC and HDCC slab specimens, respectively. Furthermore, the ductility was evaluated using the ratio of yield deflection to maximum deflection, and it was confirmed that the HDCC slab test specimen exhibited the best ductility. This is most likely due to the fact that the inserted PE mesh separates the layers and increases ductility, while the HDCC passing through the mesh prevents the loss of load carrying capacity due to layer separation.

이 연구에서는 3D 프린팅용 HDCC를 활용하여 패류 껍질의 적층형 결합구조를 모사한 1방향 슬래브의 휨 성능을 평가하였다. 휨 성능 평가를 위하여 일반 콘크리트(RC) 및 HDCC로 일체 제작된 슬래브(HDCC)와 HDCC로 제작된 슬래브 내부에 PE-mesh를 삽입하여 층상형 구조를 모방한 슬래브(HDCC-M)를 제작하여 4점 재하 휨 실험을 수행하였다. 실험결과 HDCC-M 슬래브 실험체의 내력은 RC 및 HDCC 슬래브 실험체 대비 각각 1.7배 및 1.2배 높은 결과를 나타내었다. 또한, 항복 변위와 최대처짐량의 비율로 변위 연성비를 평가한 결과, HDCC 슬래브 실험체가 가장 우수한 값을 나타내었다. 이는 삽입된 PE-mesh로 인해 층을 분리하여 연성을 증가시키는 동시 mesh 체눈을 관통하는 각주형 HDCC가 로 내력손실을 방지하였기 때문이라고 판단된다.

Keywords

Acknowledgement

이 논문은 2020년도 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임(NRF-2020R1A2C1101465).

References

  1. Choi, Y. C., Choi, J. S., and Cho, Y. W. (2011), Biomimetic Functional Materials: Find a Solution from Mother Nature, Polymer Science and Technology, 22(5), 460-466 (in Korean). 
  2. Barthelat, F. (2007), Biomimetics for next generation materials, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 365(1861), 2907-2919.  https://doi.org/10.1098/rsta.2007.0006
  3. Kakisawa, H., and Sumitomo, T. (2012), The toughening mechanism of nacre and structural materials inspired by nacre, Science and technology of advanced materials. 
  4. Li, V. C. (1997), Damage tolerance of engineered cementitious composites, Elsevier Science Ltd.(UK), 619-629. 
  5. Kwon, K. S., Bang, J. W., and Kim, Y. Y. (2018), Flexural Performance of Multi-layered Fiber-reinforced Cement Composites with Diverse Interface Shape, Journal of the Korea Concrete Institute, 30(4), 429-435 (in Korean).  https://doi.org/10.4334/JKCI.2018.30.4.429
  6. Lin, Z., Kanda, T., and Li, V. C. (1999), On interface property characterization and performance of fiber reinforced cementitious composites, RILEM J. Concrete Science and Engineering, 1, 173-184. 
  7. Cho, C. G., Kim, Y. Y., Feo, L., and Hui, D. (2012), Cyclic responses of reinforced concrete composite columns strengthened in the plastic hinge region by HPFRC mortar, Composite Structures, 94(7), 2246-2253.  https://doi.org/10.1016/j.compstruct.2012.01.025
  8. Hyun, C. J., Seo, J. S., and Kim, Y. Y.(2023), Flexural Experiments on Reinforced Concrete Beams Strengthened with SHCC and Special Reinforcements, Journal of The Korea Institute for Structural Maintenance and Inspection, 27(1), 46-53 (in Korean).  https://doi.org/10.11112/JKSMI.2023.27.1.46
  9. Hyun, J. H., Lee, B. Y., and Kim, Y. Y. (2018), Composite properties and micromechanical analysis of highly ductile cement composite incorporating limestone powder. Applied Sciences, 8(2), 151. 
  10. Boukhelf, F., Sebaibi, N., Boutouil, M., Yoris-Nobile, A. I., Blanco-Fernandez, E., Castro-Fresno, and E. Hall, A. (2022), On the Properties Evolution of Eco-Material Dedicated to Manufacturing Artificial Reef via 3D Printing: Long-Term Interactions of Cementitious Materials in the Marine Environment, Sustainability, 14(15), 9353. 
  11. Lee, B. J., Kim, B. K., and Kim, Y. Y. (2022), Strength and Durability Characteristics of Low-alkali Mortar for Artificial Reefs Produced by 3D Printers, Journal of the Korea Institute for Structural Maintenance and Inspection, 26(1), 67-72 (in Korean).  https://doi.org/10.11112/JKSMI.2022.26.1.67
  12. Seo, J. S., Hyun, C. J., and Kim, Y. Y. (2022), Effect of polymer post-treatment on the durability of 3D-printed cement composites, Journal of the Korea Institute for Structural Maintenance and Inspection, 26(5), 20-29 (in Korean).  https://doi.org/10.11112/JKSMI.2022.26.5.20
  13. Kim, H. J., Lee, B. J., and Kim, Y. Y. (2023), Material Properties of 3D Printed Mortars Produced with Synthetic Fibers and Biopolymers, Journal of the Korea Institute for Structural Maintenance and Inspection, 27(4), 78-85 (in Korean).  https://doi.org/10.11112/JKSMI.2023.27.4.78
  14. Kwon, K. S., Chun. J. Y., and Kim, Y. Y. (2020), Flexural Behavior of Highly Ductile Cement Composites Mimicking Boundary Conditions of Shellfish Skin Layer, Journal of the Korea Institute for Structural Maintenance and Inspection, 24(1), 108-115 (in Korean).  https://doi.org/10.11112/JKSMI.2020.24.1.108
  15. Seo, J. S., Lee, B. C., and Kim, Y. Y. (2020), The Effects of Void Ratio on Extrudability and Buildability of Cement-based Composites Produced by 3D Printers, Journal of the Korea Institute for Structural Maintenance and Inspection, 23(7), 104-112 (in Korean). https://doi.org/10.11112/JKSMI.2019.23.7.104