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Reduction of Drying Shrinkage of Mortar and Concrete by Expansion of Rapid Cooling Slag Fine Aggregate

급냉 슬래그 잔골재의 팽창성을 활용한 모르타르 및 콘크리트의 건조수축저감에 관한 연구

  • Lee, Dong-Gyu (Research Institute for Engineering & Technology, Chungcheong University) ;
  • Min, Kyung-Hwan (Research Institute for Engineering & Technology, Chungcheong University) ;
  • Jeong, Yong-Wook (Advenced Construction Materials Testing Center, Keimyung University)
  • 이동규 (충청대학교 공학기술연구원) ;
  • 민경환 (충청대학교 공학기술연구원) ;
  • 정용욱 (계명대학교 첨단건설재료실험센터)
  • Received : 2015.04.07
  • Accepted : 2015.05.07
  • Published : 2015.05.31

Abstract

It is necessary to maximize the durability of Concrete for the underground structure because its maintenance and reinforcement are difficult. For cracks due to drying shrinkage of the concrete on the characteristics of the material, there is a need for an alternative in the deterioration phenomenon that occurs. In this study, fundamental properties including drying shrinkage of mortar and concrete were investigated to replace fine aggregate from cooling slag for reducing drying shrinkage of mortar and concrete. In the case of rapid cooling slag fine aggregate, it was effective to reduce and restrain initial shrinkage of mortar and concrete, and compressive strength was increased through the all specimen in proportion to its replacement ratio.

본 지하매설 구조물용 콘크리트는 보수가 어려워 내구성을 극대화할 필요가 있는데, 콘크리트의 건조수축에 의한 균열은 재료의 특성상 발생하는 열화현상으로 대안이 필요하다. 본 연구에서는 건조수축 저감방안의 하나로써 급냉 슬래그 잔골재의 반응에 의한 팽창을 활용하여 콘크리트의 건조수축 발생량을 저감시키고자 하였는데, 실험결과 초기 재령에서 발생되는 수축을 효과적으로 억제하는 것으로 확인되었으며, 급냉 슬래그 잔골재의 치환사용량과 비례하여 전 재령에 거쳐 압축강도가 상승하는 것을 확인할 수 있었다.

Keywords

References

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