한국건설순환자원학회논문집 (Journal of the Korean Recycled Construction Resources Institute)

한국건설순환자원학회 (Korean Recycled Construction Resources Institute)
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압축강도 수준별 순환골재 콘크리트의 강도와 길이변화 특성

The Strength and Length Change Properties of Recycled Aggregate Concrete(RAC) by Compressive Strength Levels

  • 이봉춘 (한국건설생활환경시험연구원 대전.충남지원) ;
  • 이준 (한국건설생활환경시험연구원 대전.충남지원) ;
  • 조영근 (한국건설생활환경시험연구원 첨단건설재료센터) ;
  • 정상화 (한국건설생활환경시험연구원 첨단건설재료센터)
  • Lee, Bong-Chun (Daejeon & Chungnam Branch, Korea Conformity Laboratories) ;
  • Lee, Jun (Daejeon & Chungnam Branch, Korea Conformity Laboratories) ;
  • Cho, Young-Keun (High-tech Construction Materials Center, Korea Conformity Laboratories) ;
  • Jung, Sang-Hwa (High-tech Construction Materials Center, Korea Conformity Laboratories)
  • 투고 : 2015.12.01
  • 심사 : 2015.12.17
  • 발행 : 2015.12.30
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초록

본 연구에서는 국내에서 생산되고 있는 콘크리트용 순환 굵은 골재를 사용하여 콘크리트의 압축강도 수준별(20, 35, 50MPa) 순환 굵은 골재의 혼입률 변화가 강도와 건조수축에 미치는 영향을 분석하였다. 실험결과 순환 굵은 골재의 치환율 변화에 따른 유동성(슬럼프)은 순환골재를 혼입하지 않은 경우에 비해 동등하거나 양호한 유동성을 갖는 것으로 나타났다. 이러한 영향은 국내에서 생산되는 순환골재의 양호한 입형이 유동성 개선에 기여한 것으로 판단된다. 또한, 순환 굵은 골재의 치환율 변화에 따른 압축강도는 순환골재 혼입률이 증가할수록 약 9~10% 감소하는 것으로 나타났으며 순환 굵은 골재의 치환율에 따른 길이변화는 강도 수준에 관계없이 약 4~40%의 범위로 증가하는 것으로 나타났다. 저강도 수준(20MPa)에서의 길이변화량은 약 18~40%로 35MPa 및 50MPa 수준의 길이변화량 약 4~17% 보다 큰 것으로 나타났다. 저강도 수준(20MPa)에서의 순환 굵은 골재 활용량을 증대시키기 위해서는 광물혼화제의 첨가 등 건조수축을 억제시킬 수 있는 방안 마련이 필요하다.

This paper addresses mechanical properties and length change performance of the recycled aggregate concretes(RAC) in which natural coarse was replaced by recycled coarse aggregate(RCA) by compressive strength levels(20, 35, 50 MPa). A total of 9 RAC were produced and classified into three series, each of which included three mixes designed with three compressive strength levels of 20 MPa, 35 MPa and 50 MPa and three RCA replacement ratios of 0, 50 and 100%. Physical/Mechanical properties of RAC were tested for slump test, compressive strength, and length change. The test results indicated that the workability of RC could be improved or same by RCA replacement ratios, when compared with that containing no RCA. This is probably because of the RCA shape improving the workability of RAC. Also, the test results showed that the compressive strength was decreased by 9~10% as the RCA replacement ratios increase. However, the length change ratio by the RCA replacement ratios increased regardless of compressive strength levels. At 20 MPa level, the length change ratio was 8~40% which was much higher than that of 4~17% at both 35 and 50 MPa levels. Therefore, it was considered that such admixture addition preventing dry shrinkage is required in order to improve the properties of the RAC at 20 MPa level.

키워드

참고문헌

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피인용 문헌

  1. The Effects of Steel-Fiber Reinforcement on High Strength Concrete Replaced with Recycled Coarse Aggregates More Than 60% vol.4, pp.4, 2016, https://doi.org/10.14190/JRCR.2016.4.4.404