Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Evaluation of Bonding Performance in UHPC-based Concrete Repair Materials Considering Surface of Structure Subject to Repair

보수대상 구조 표면 상태를 고려한 UHPC 기반 콘크리트 보수재료의 부착 성능 평가

  • 윤용식 (한국건설기술연구원 남북한인프라특별위원회) ;
  • 김경철 (한국건설기술연구원 남북한인프라특별위원회 북방인프라특화팀) ;
  • 임광모 (한국건설기술연구원 남북한인프라특별위원회) ;
  • 안기홍 (한국건설기술연구원 구조연구본부) ;
  • 류금성 (한국건설기술연구원 구조연구본부) ;
  • 고경택 (한국건설기술연구원 남북한인프라특별위원회)
  • Received : 2023.11.06
  • Accepted : 2023.11.20
  • Published : 2023.12.30
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Abstract

In this study, the bonding performance of repair materials was evaluated on concrete repair surface to develop concrete repair materials based on UHPC (Ultra High Performance Concrete) which has high mechanical and durability performance. The ten test variables were applied considering the roughness and wet condition of the concrete surface subject to repair, the addition of polymer, and the use PP and PVA fibers in repair materials. The addition of the polymer caused a significant decrease in strength, which was thought to be due to the effect of the additional super plasticizer used to adjust workability. Also, flow was reduced by up to 13.8 % with the use of plastic-based fibers. As a result of evaluating the bond strength of the repair material considering the condition of the surface subject to repair, it was thought that in the case of using UHPC-based repair material, high bonding performance could be secured without any additional surface treatment as long as the surface of the base material was sound. In addition, UHPC-based repair materials showed high bonding performance even when the attachment surface was wet. In the future, research will be conducted on shot-crete application and gradient pouring for the development of UHPC-based repair materials, and continuous improvement in the repair material mixing property will be carried out to ensure economic efficiency and performance as a concrete structural repair material.

본 연구에서는 높은 역학적, 내구적 성능이 확보된 UHPC(Ultra High Performance Concrete) 배합을 기반으로 보수재료를 개발하기 위해 일반 콘크리트 보수면을 대상으로 부착성능을 평가하였다. 보수 대상 모체의 표면의 거칠기와 습윤 상태 그리고 보수재료 배합에 폴리머 혼입 및 PP, PVA 섬유 사용을 고려하여 총 10가지 시험 변수를 적용하였다. 폴리머를 혼입함에 따라 큰 폭의 강도 저하가 발생하였으며 이는 워커빌리티 조정을 위해 추가로 사용한 감수제의 영향으로 사료된다. 또한 플라스틱 계열 섬유를 혼입함에 따라 플로우가 최대 13.8 % 감소하였다. 부착면의 상태를 고려한 보수재료의 부착 강도 평가 결과 UHPC 기반 보수재료를 사용하는 경우 보수 대상 모체의 표면이 건전하다면 별도의 면 처리 작업 없이 높은 부착성능을 확보할 수 있는 것으로 판단된다. 또한 UHPC 기반 보수재료는 부착면의 습윤하더라도 높은 부착성능을 나타내었다. 추후 UHPC 기반 보수재료의 개발을 위해 숏크리트 적용과 구배 타설에 대한 연구가 진행될 예정이며 콘크리트 구조 보수재료로써의 경제성과 성능 확보를 위해 지속적인 보수재료 배합 개선이 수행될 계획이다.

Keywords

Acknowledgement

본 연구는 과학기술정보통신부 한국건설기술연구원 연구운영비 지원(주요사업)사업으로 수행되었습니다(과제번호 20230275-001, 슈퍼콘크리트 활용 혹한기 지역 맞춤형 콘크리트 교량의 보수 재료⋅공법 개발 및 실증).

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