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2025 Vol.38, Issue 1 Preview Page

Research Paper

Mechanical Properties and Interfacial Transition Zone Microstructure Analysis of 3D Printed Concrete Utilizing Waste Cockle Shell Aggregate and PP Fiber Waste Fishing Net

꼬막 패각 및 PP 섬유 폐어망을 활용한 3D 프린팅 자원순환 콘크리트의 역학적 성능 및 계면 변화 영역 미세구조 분석

Hyunju Oh1
,
Jeewoo Suh2
,
Ju-Hyeon Park1
,
Tong-Seok Han3*
오 현주1
,
서 지우2
,
박 주현1
,
한 동석3*
1Graduate Student, Department of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
2Graduate Student, Department of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
3Professor, Department of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
1연세대학교 건설환경공학과 석사과정
2연세대학교 건설환경공학과 석박사통합과정
3연세대학교 건설환경공학과 교수
*Corresponding Author
28 February 2025. pp. 11-18
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Abstract

This study examines the mechanical properties and microstructural characteristics of the interfacial transition zone in 3D-printed recycled concrete incorporating cockle shell aggregate and polypropylene (PP) waste fishing net. The shell aggregate and waste fishing net underwent the requisite pre-treatment, and a concrete mix suitable for 3D printing was selected with a focus on recycling marine waste. The specimens were subjected to compressive and flexural strength tests in accordance with KS L ISO 679, while their microstructure was analyzed using scanning electron microscope (SEM) images obtained in backscattered electron (BSE) mode. The SEM images were segmented using a histogram- and morphology-based phase segmentation method, as well as pixel value differences in regions exhibiting an interfacial transition zone, to analyze microstructural characteristics. The mechanical properties were evaluated by measuring the compressive and flexural strength of specimens with varying PP fiber contents, specifically 0.0%, 0.5%, and 1.0 vol.%. The results demonstrated that the specimen containing 0.5 vol.% PP fiber exhibited the highest compressive and flexural strength, which was attributed to the fiber bridging effect. SEM image analysis revealed that larger-diameter pores were observed at the interface between the shell fine aggregates and binder compared to those in the fine aggregate case, whereas relatively smaller pores formed around the PP fibers. A correlation was thus established between the microstructural analysis results and mechanical performance.

Keywords
recycled concrete
cockle shell aggregate
PP fiber waste fishing net
mechanical property
microstructural analysis

본 연구는 꼬막 패각 잔골재와 PP 폐어망 섬유를 혼입한 자원순환 콘크리트의 역학적 성능과 계면 변화 영역에서의 미세구조 특성을 분석하였다. 패각 잔골재와 폐어망 섬유를 적절한 방법으로 전처리하고 자원화를 고려하여 3D 프린팅 콘크리트 배합을 선정해 콘크리트 시편을 제작하였다. 제작된 시편은 KS L ISO 679 규정에 따라 압축강도와 휨강도를 측정하였고, BSE 모드를 이용한 SEM 이미지 촬영을 통해 미세구조를 분석하였다. SEM 이미지는 히스토그램 및 형상 기반 상 분리 방법, 그리고 계면 변화 영역의 픽셀값 차이를 활용하여 이미지를 분리하고 미세구조를 분석하였다. 역학적 성능을 확인하기 위해 PP 섬유를 0.0%, 0.5%, 1.0vol.% 혼입한 시편의 압축강도와 휨강도를 측정한 결과, PP 섬유 0.5vol.% 혼입 시 섬유 브릿징 효과로 인해 가장 높은 압축 및 휨강도가 나타났다. SEM 이미지 분석 결과, 일반 잔골재와 바인더 계면보다 패각 잔골재와 바인더 계면에서 더 큰 직경의 공극이 관찰되었으며, PP 섬유와 바인더 계면에서는 상대적으로 작은 공극이 형성됨을 확인하였다. 이를 바탕으로 미세구조 분석 결과와 역학적 성능 간의 상관관계를 규명하였다.

키워드
자원순환 콘크리트
꼬막 패각 잔골재
PP 섬유 폐어망
역학적 성능
미세구조 분석
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Information
  • Publisher :Computational Structural Engineering Institute of Korea
  • Publisher(Ko) :한국전산구조공학회
  • Journal Title :Journal of the Computational Structural Engineering Institute of Korea
  • Journal Title(Ko) :한국전산구조공학회 논문집
  • Volume : 38
  • No :1
  • Pages :11-18
  • Received Date : 2024-08-22
  • Revised Date : 2024-09-18
  • Accepted Date : 2024-09-19
  • DOI :https://doi.org/10.7734/COSEIK.2025.38.1.11
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