Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Evaluation on the Chloride Ion Diffusion Coefficient of Mortar Depending on Replacement Ratio of Recycled Fine Aggregate

순환잔골재 치환율에 따른 모르타르의 염화물이온확산계수 평가

  • Lee, Sang-Yun (Dept. of Architectural Eng., Chungnam National University) ;
  • Yoo, Jae-Chul (Dept. of Architectural Eng., Chungnam National University) ;
  • Kim, Gyu-Yong (Dept. of Architectural Eng., Chungnam National University) ;
  • Yoon, Min-Ho (Dept. of Architectural Eng., Chungnam National University) ;
  • Nam, Jeong-Soo (Institute of Innovative Research, Tokyo Institute of Technology) ;
  • Choi, Hyeong-Gil (Dept. of Civil Eng. and Architecture, Muroran Institute of Technology)
  • Received : 2016.05.30
  • Accepted : 2016.10.07
  • Published : 2016.12.20
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Abstract

This paper presents an experimental study conducted to investigate the effect of recycled fine aggregate (RFA) on the mechanical properties and chloride diffusion behavior of mortar. The test results revealed that the addition of RFA plays an important role in the mechanical properties and pore structures of the investigated mortar specimens as well as chloride diffusion behavior. The mechanical properties such as compressive strength and flexural strength of recycled fine aggregate mortar (RFAM) were gradually decreased as RFA replacement ratio increase. The pore structure of RFAM was examined by permeability tests. The RFAM showed a increment in the permeability according to replacement ratio increase of RFA. But the chloride diffusion coefficient of RFAM was almost same up to 50% replacement ratio of RFA due to a chloride binding phenomenon of RFAM which may compensate the higher permeability of RFAM.

콘크리트용 천연골재의 공급이 어려워지고 건설폐기물은 발생량이 지속적으로 증가하고 있는 추세이다. 따라서 건설폐기물을 골재로 만든 순환골재 사용의 필요성이 대두되고 있다. 이에 순환골재를 사용한 콘크리트의 특성에 대한 많은 연구가 진행되고 있으나 대부분의 연구들이 부정적인 결과를 나타내고 있다. 하지만 최근 연구들을 중심으로 긍정적인 연구결과들이 보고되고 있으며 그 중 순환굵은골재의 부착 모르타르의 염화물고정효과에 관한 연구도 보고되고 있다. 따라서 본 연구에서는 순환굵은골재에 비해 모르타르 함량이 많아 염화물고정에 유리하다고 예상되는 순환잔골재를 사용한 모르타르의 역학적 특성과 염화물확산을 평가한 결과 순환잔골재의 염화물고정효과를 확인했다.

Keywords

References

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