Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Effect of Recycled Fine Aggregates and Fly Ash on the Mechanical Properties of PVA Fiber-Reinforced Cement Composites

순환잔골재 및 플라이애시가 PVA 섬유보강 시멘트 복합체의 역학적 특성에 미치는 영향

  • Nam, Yi-Hyun (Dept. of Convergence System Engineering, Chungnam National University) ;
  • Park, Wan-Shin (Dept. of Construction Engineering Education, Chungnam National University) ;
  • Jang, Young-Il (Dept. of Construction Engineering Education, Chungnam National University) ;
  • Yun, Hyun-Do (Dept. of Architectural Engineering, Chungnam National University) ;
  • Kim, Sun-Woo (Dept. of Construction Engineering Education, Chungnam National University)
  • 남의현 (충남대학교 융복합시스템공학과) ;
  • 박완신 (충남대학교 건설공학교육과) ;
  • 장영일 (충남대학교 건설공학교육과) ;
  • 윤현도 (충남대학교 건축공학과) ;
  • 김선우 (충남대학교 건설공학교육과)
  • Received : 2016.10.31
  • Accepted : 2017.02.17
  • Published : 2017.04.30
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Abstract

As the amount of construction wastes increase, reuse of recycled materials is being considered in research areas. While there are many experimental investigations focusing on development of mortar and concrete using the recycled materials, the studies regarding the fiber-reinforced cement composites (FRCCs) using recycled materials are still limited. In this paper, an experimental attempt has been made to investigate the effect of recycled fine aggregates and fly ash on the mechanical properties of PVA FRCCs. The cement and natural sand were respectively replaced by fly ash and recycled fine aggregates at two content levels, 25% and 50%. Ten types of PVA FRCCs mixes were fabricated and tested to investigate the flexural, compressive and direct tensile behaviors. The test results show that flexural, compressive and direct tensile strength were decreased with increase in fly ash content at all ages. In particular, flexural, compressive and direct tensile strengths of specimens, containing 50% recycled fine aggregates and 50% fly ash, showed the lowest values. The modulus of elasticity of specimens showed similar trend to the 28-day compressive strength. Poisson's ratio was increased with increase in fly ash and recycled fine aggregates content.

건설 폐기물 양이 증가하면서, 순환재료의 재사용은 건설 분야 중에서도 학문적으로 활발하게 연구되고 있는 분야로 자리 매김하고 있다. 이에 따라 순환재료를 사용한 모르타르 및 콘크리트 품질의 개선과 역학적 특성을 규명하고자 하는 연구는 활발하게 진행되고 있지만, 순환재료를 사용한 섬유보강 시멘트 복합체에 대한 연구는 많지 않다. 본 연구에서는 순환잔골재 및 플라이애시가 PVA 섬유보강 시멘트 복합체의 역학적 특성에 미치는 영향에 대해서 실험적으로 분석하고자 하였다. 순환잔골재 및 플라이애시 치환율은 25% 및 50%로 설정하였으며, 순환재료 치환율에 따른 10개의 PVA 섬유보강 시멘트 복합체의 휨, 압축 및 인장거동을 실험적으로 평가하였다. 실험결과 플라이애시 치환율이 증가함에 따라 휨, 압축, 직접인장강도가 감소하였다. 특히 순환잔골재 및 플라이애시를 각각 50% 치환하는 경우 강도가 가장 낮게 나타났다. 탄성계수는 재령 28일에서의 압축강도와 유사한 경향을 나타냈으며, 푸아송 비는 순환잔골재 및 플라이애시 치환율이 증가함에 따라 크게 나타났다.

Keywords

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