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

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Shear Bond Strength of 3D Printed Concrete Layers According to Water Cement Ratio and Printing Time Gap

물시멘트비와 프린팅 시간간격에 따른 3D 프린팅 콘크리트 레이어의 전단부착강도

  • 김진호 (서울시립대학교 건축공학과) ;
  • 이윤정 (서울시립대학교, 건축공학과 스마트시티융합전공) ;
  • 정호성 (서울시립대학교, 건축공학과 스마트시티융합전공) ;
  • 김강수 (서울시립대학교, 건축공학과 스마트시티융합전공)
  • Received : 2021.10.29
  • Accepted : 2021.12.06
  • Published : 2021.12.31
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Abstract

The extrudability of 3D printed concrete and its member strength can be highly influenced by water cement ratio (W/C) and printing time gap (PTG). In this study, mold cast specimens and 3D printed specimens were fabricated with variables of W/C ratio and PTG, and their shear bond strength and interlayer surface moisture content were measured and analyzed. The test results showed that the shear bond strength is greatly influenced by the amount of interlayer surface moisture. It is thus recommended that proper amount of interlayer surface moisture with respect to PTG needs to be maintained to have a required interlayer shear bond strength. In addition, further research is required to estimate the effect of many environmental factors that can influence the interlayer surface moisture content.

3D 프린팅 콘크리트의 출력성능 및 부재 강도는 물시멘트비(Water cement ratio, W/C)와 레이어의 프린팅 시간 간격(Printing Time Gap, PTG)에 의하여 큰 영향을 받을 수 있다. 이 연구에서는 W/C와 PTG를 변수로 하여 제작된 프린팅실험체와 몰드 실험체의 표면수분량과 전단부착강도와의 관계를 측정·고찰하였으며, 그 결과, 레이어표면수분량이 전단부착강도에 큰 영향을 주는 것으로 나타났다. 따라서, 3D 프린팅 출력 시 요구되는 레이어 계면 전단부착성능을 확보하기 위해서는 PTG에 따라 적절한 레이어표면수분량이 유지될 수 있도록 유의해야 하며, 레이어표면수분량에 영향을 줄 수 있는 여러 가지 프린팅 환경인자들 대한 후속 연구도 필요할 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 2019년도 정부(교육과학기술부)의 재원으로 한국연구재단 중견연구의 지원을 받아 수행되었습니다. (과제번호: NRF-2019R1A2C2086388).

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