Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Static and Fatigue Flexural Tests of Ductile High-performance Fiber Reinforced Cementitious Composites

고인성 섬유보강 콘크리트의 정적 및 피로 휨시험

  • Shin, Kyung-Joon (Department of Civil Engineering, Chungnam National University) ;
  • Lee, Do-Keun (Department of Civil Engineering, Chungnam National University) ;
  • Lee, Kyoung-Chan (Department of Civil Engineering, Pai Chai University) ;
  • Kim, Sung-Il (Korea Railroad Research Institute)
  • 신경준 (충남대학교 토목공학과) ;
  • 이도근 (충남대학교 토목공학과) ;
  • 이경찬 (배재대학교 드론.철도.건설시스템공학과) ;
  • 김성일 (철도기술연구원 철도구조연구실)
  • Received : 2021.11.12
  • Accepted : 2021.12.13
  • Published : 2021.12.30
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Abstract

Recently, research and development has been conducted to impart high performance and functionality to concrete materials by mixing various reinforcing materials into the matrix. Ductile fiber reinforced concrete using a large amount of fibers shows a distributed multiple cracking behavior, and various studies are being conducted on this material. However, research is focused on static behavioral analysis but studies on cyclic behaviors are not sufficient. In this study, beams were made of ductile fiber reinforced concrete with various fiber contents, and static and fatigue flexural tests were performed. As a result, the effect of fiber content on the flexural behavior was analyzed. Also, the applied load level and fatigue life relationship of ductile fiber reinforced concrete was proposed. Concrete with high ductile property could be achieved with a fiber content of 2%. When 0.5% fiber was more added, the maximum flexural strength was similar, but the flexural toughness is nearly doubled. On the other hand, there was no significant difference in the fatigue life of these two mixtures.

최근에는 다양한 보강재를 매트릭스에 혼입하는 방식으로 콘크리트 재료에 다양한 유형의 성능을 부여하는 연구 개발이 이루어지고 있다. 다량의 섬유를 사용하여 배합된 고인성 콘크리트는 다중균열분산 특성을 가지고 있으며, 이에 대한 다양한 연구가 수행되고 있다. 하지만 정적 하중에 대한 연구가 집중되고 있으며, 반복적인 하중에 대한 연구는 부족한 실정이다. 본 연구에서는 섬유비율을 달리한 고인성 콘크리트로 보를 제작하였고, 정적 휨시험과 피로 휨시험을 수행하였다. 그 결과 섬유 함량이 휨 거동에 미치는 영향을 분석하였고, 고인성 콘크리트의 하중-수명 관계를 S-N관계식으로 제안하였다. 2%의 섬유 혼입량으로 고인성 특성의 콘크리트를 배합할 수 있었다. 0.5% 섬유를 추가하는 경우 최대 휨강도는 유사하지만 휨인성은 2배 가까이 향상되는 것으로 나타났다. 반면, 두 배합의 피로수명은 큰 차이를 보이지 않았다.

Keywords

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었음(과제번호 21CTAP-C152090-03).

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