Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Analysis of Permeability Characteristics for Fly Ash Concrete According to Aggregate Size and Mixing Ratio

골재크기와 배합비에 따른 플라이애시 콘크리트의 투기특성 분석

  • Eun-A Seo (Department of Structural Engineering Research, Korea Institute of Civil engineering and Building Technology) ;
  • Do-Gyeum Kim (Department of Structural Engineering Research, Korea Institute of Civil engineering and Building Technology) ;
  • Chul-Woo Jung (Department of Architectural Engineering, Pukyong National University) ;
  • Ho-Jae Lee (Department of Structural Engineering Research, Korea Institute of Civil engineering and Building Technology)
  • 서은아 (한국건설기술연구원 구조연구본부) ;
  • 김도겸 (한국건설기술연구원 구조연구본부) ;
  • 정철우 (부경대학교 건축공학과) ;
  • 이호재 (한국건설기술연구원 구조연구본부)
  • Received : 2023.11.01
  • Accepted : 2023.11.13
  • Published : 2023.12.30
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Abstract

In this study, the relationship between the material properties and air permeability characteristics was examined, an experimental method to analyze the air permeability characteristics was presented, and experimental results were derived. The effects of compressive strength and apparent density of hardened concrete on air permeability characteristics were evaluated experimentally. Focusing on the mix proportions used in nuclear power plant concrete structures, concrete test specimens were manufactured and air permeability characteristics were measured according to changes in binder, maximum aggregate size, and water-binder ratio. The apparent density was over 2,400 kg/m3 for the OPC mix and the FA-35 mix, and the air permeability for both mixes were low, in the range of 0.1-0.2 L/min. On the other hand, in the case of the combination of FA-40, FA-45, and FA-M, the apparent density was measured to be less than 2,400 kg/m3 and the air permeability was measured to be more than 0.3 L/min, experimentally verifying that the apparent density is an important factor in air permeability characteristics.

이 연구에서는 재료의 물성과 투기특성과의 관계를 검토하였으며 투기특성을 분석하기 위한 실험방법을 제시하고 실험결과를 도출하였다. 경화된 콘크리트의 압축강도와 겉보기 밀도가 투기특성에 미치는 영향에 대해서 실험적 방법으로 평가하였다. 원전 콘크리트 구조물에 사용된 배합을 중심으로 결합재, 최대 골재 치수, 물-결합재 비의 변화에 따라 콘크리트 시험체를 제작하고 투기특성을 측정했다. 겉보기 밀도는 OPC 배합과 FA-35 배합이 2,400 kg/m3 이상 나타났으며, 두 배합의 기체 투기량이 0.1 ~ 0.2 L/min 의 범위로 낮게 나타났다. 반면, FA-40와 FA-45 및 FA-M 배합의 경우 겉보기 밀도는 2,400 kg/m3 이하 투기량은 0.3 L/min 이상으로 측정되어 겉보기 밀도가 투기특성에 중요한 인자임을 실험적으로 검증하였다.

Keywords

Acknowledgement

이 연구는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. RS-2022-00143120)

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