Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Development of Shrinkage Reducing Agent for 3D Printing Concrete

3D 프린팅 콘크리트용 수축저감제 개발

  • 이동규 (동남기업(주) 중앙연구소) ;
  • 유병현 (동남기업(주) 중앙연구소) ;
  • 손호정 (동남기업(주) 중앙연구소)
  • Received : 2019.10.07
  • Accepted : 2019.12.06
  • Published : 2019.12.31
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Abstract

Since 3D printed concrete can be constructed without formwork, it is easy to construct an atypical structure, and the construction time and labor cost can be reduced. However, since the construction is exposed to the outside, shrinkage cracking due to moisture loss inside and outside the concrete occurs. Therefore, in order to improve the durability of the 3D printed concrete, a shrinkage reduction plan of the 3D printed concrete is required. In this study, glycol-based and alcohol-based shrinkage reducing agents were fabricated and evaluated for their performance. The shrinkage reducing agent samples showing excellent performance were selected and applied to 3D printed concrete. As a result, the compressive strength was increased by more than 10% and the shrinkage was reduced by more than 36% when using a shrinkage reducing agent. It is expected that the production of high quality 3D printed concrete will be possible because it is possible to increase the compressive strength and reduce the amount of dry shrinkage by applying a shrinkage reducing agent for 3D printed concrete.

3D 프린팅 콘크리트는 거푸집 없이 시공이 가능하기 때문에 비정형 구조물 건설이 용이하고, 연속시공에 따른 공사시간 단축 및 공사현장 인력 감소로 인한 인건비 절감이 가능하다는 장점이 있지만, 외부에 노출된 상태로 시공을 하기 때문에 콘크리트 내외부의 수분 손실에 의한 수축균열이 발생확률이 크다는 문제점이 있어 3D 프린팅 콘크리트의 내구성 향상을 위해서는 3D 프린팅 콘크리트의 수축저감 방안이 필수적으로 요구된다. 이에 본 연구에서는 글리콜계 및 알콜계 수축저감제 샘플 7종을 제조하여 그 성능을 평가하였고, 우수한 성능을 보인 수축저감제 샘플을 선별하여 이를 적용한 3D 프린팅 콘크리트의 기초적 특성을 확인하였다. 그 결과 수축저감제 사용 시 기존의 3D 프린팅 콘크리트 대비 압축강도가 10% 이상 증진되었고, 수축량은 36% 이상 감소되었다. 3D 프린팅 콘크리트용 수축저감제의 적용으로 압축강도 증진 및 건조수축량 저감이 가능하기 때문에 기존의 3D 프린팅 콘크리트 대비 내구성 향상이 가능하여 고품질의 3D 프린팅 콘크리트의 제조가 가능할 것으로 기대된다.

Keywords

References

  1. B. H. Yoo, H. S. Han, D. G. Lee, "Investigation of Fundamental Properties for Development of Chemical Admixture of 3D Printing Concrete", Journal of Korea Concrete institute, Vol.29, No.2, pp.555-556, Oct. 2017.
  2. J. P. Park, Y. W. Jung, "Performance Improvement of High Performance Shrinkage Reducing Agent using Early Strength Improving Agent", Journal of Korea Academia-Industrial cooperation Society, Vol.17, No.4, pp.296-302, April. 2016. DOI: https://doi.org/10.5762/KAIS.2016.17.4.296
  3. M. C. Han, "Estimation of the Autogenous Shrinkage of the High Performance Concrete Containing Expansive Additive and Shrinkage Reducing Agent", Journal of Korea institute of building construction, 7(3), pp. 123-130, Sep. 2007. DOI: https://doi.org/10.5345/JKIC.2007.7.3.123
  4. I. S. Hwang, M. C Han, C. G Han, "Properties of Drying Shrinkage of Concrete with Unit Water and Contents of Shrinkage Reducing Admixtures", Journal of Architectural institute of korea, 20(6), pp. 75-82, 2004.
  5. S. H. Lee, "Properties of Reducing Drying Shrinkage by Using Shrinkage Reducing Agent", Journal of Korean society of civil engineers, 16(1-4), pp. 435-443, 1996.
  6. P. J. Park, B. H. Yoo, Y. H. Kwon, H. S. Han, "Fundamental Properties of Concrete Corresponding to Various Shrinkage Reducing Materials", Journal of Korea Concrete institute, Vol.26 No.2, pp.315-316, Oct. 2014. https://doi.org/10.4334/JKCI.2014.26.3.315
  7. P. J. Park, B. H. Yoo, H. J. Son, H. S. Han, "Shrinkage Properties of High strength Concrete Corresponding to Various Shrinkage Reducing Agent", Journal of Korea Concrete institute, Vol.28 No.2, pp.265-266, Oct. 2016.
  8. H. J. Lee, W. W. Kim, J. H. Moon, "Study on Rheological Properties of Mortar for the Application of 3D Printing Method", Korea Recycled Construction Resources Institute, Vol.6 No.1, pp.16-24, March. 2018. DOI: https://doi.org/10.14190/JRCR.2018.6.1.16
  9. B. H. Yoo, J. H. Shin, H. J. Son, D. G. Lee, H. S. Han, H. W. Choi "Development of Thixotropy Materials for 3D Printing Concrete", Journal of Korea Concrete institute, Vol.30 No.1, pp.549-550, May. 2018.
  10. H. J. Lee, W. W. Kim, E. A. Seo, J. H. Moon "A Study on the Pore Distribution between Layer of 3D Printed Mortar", Journal of Korea Concrete institute, Vol.31 No.1, pp.595-560, May. 2019.
  11. J. P. Park, Y. W. Jung, "Fundamental Properties on the Development of High Performance Shrinkage Reducing Agent for Concrete", Journal of Korea Academia-Industrial cooperation Society, Vol.16, No.6, pp.4298-4307, Jun. 2015. DOI: https://doi.org/10.5762/KAIS.2015.16.6.4298
  12. M. C. Han, D. G. Lee "Strength and Autogenous Shrinkage of High Strength Mortar Using Water Substituting Liquid", Journal of the Korea Institute of Building Construction, Vol.11 No.6, pp.538-546, Sep. 2011. DOI: https://doi.org/10.5345/JKIBC.2011.11.6.538
  13. A. Safat, R. Gianluca, V Zora "SShrinkage effects on the flexural stiffness of composite beams with solid concrete slabs: An experimental study", Engineering Structures, Vol.33 No.4, pp.1302-1315, April. 2011. DOI: https://doi.org/10.1016/j.engstruct.2011.01.007