Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Characteristics Evaluation of Solidifying Agent for Disposal of Radioactive Wastes Using Waste Concrete Powder

원전 폐콘크리트의 방사성 폐기물 처분용 고화제로의 활용을 위한 고화체 특성 평가

  • Seo, Eun-A (Department of Structural Engineering Research, Korea Institute of Civil engineering and Building technology) ;
  • Lee, Ho-Jae (Department of Structural Engineering Research, Korea Institute of Civil engineering and Building technology) ;
  • Kwon, Ki-Hyon (Department of Structural Engineering Research, Korea Institute of Civil engineering and Building technology) ;
  • Kim, Do-Gyeum (Department of Structural Engineering Research, Korea Institute of Civil engineering and Building technology)
  • 서은아 (한국건설기술연구원 구조연구본부) ;
  • 이호재 (한국건설기술연구원 구조연구본부) ;
  • 권기현 (한국건설기술연구원 구조연구본부) ;
  • 김도겸 (한국건설기술연구원 구조연구본부)
  • Received : 2021.09.28
  • Accepted : 2021.11.16
  • Published : 2021.12.30
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Abstract

The purpose of this study is to evaluate the performance of a solidifying agent for recycling the fine powder separated from the nuclear power plant decommissioned concrete as a solidifying agent(SA) for radioactive waste. In order to evaluate the performance of the solidifying agent, a powder simulating the fine powder of waste concrete separated from the dismantled concrete of a nuclear power plant was produced, and the main variables were the type of binder and the replacement ratio of zeolite. The solidifying agent was evaluated for fluidity performance, compressive strength, and leaching resistance to non-radioactive cesium. The compressive strength of SA increased as the zeolite replacement ratio increased, and the SA containing 5% or more of zeolite showed a compressive strength that was 1.4 to 1.7 times higher than the acceptance criteria. The cesium leaching index of all specimens was 6 or higher, satisfying the acceptance criteria, and the leaching index of SA was 1.47~1.63 times higher than that of OPC. In particular, the average leaching index after 28 days of the 5% zeolite-substituted solidifying agent was 9.15, which was improved by about 6.4% compared to OPC, and it was confirmed that the zeolite was effective in improving the leaching resistance to cesium ions by showing stable performance over the entire period.

이 연구에서는 원전 해체 콘크리트에서 분리된 폐콘크리트 미분말을 방사성 폐기물용 고화제로 재활용하기 위한 성능평가를 수행하였다. 원전 해체 콘크리트에서 분리된 폐콘크리트 미분말을 모사한 시료를 제작하였으며, 주요 변수는 결합재 종류와 제올라이트 혼입율이었다. 고화제 특성평가는 유동성과 압축강도 및 비방사성 세슘에 대한 침출 저항성을 수행하였다. 폐콘크리트 모사시료의 압축강도는 제올라이트 혼입율이 증가함에 따라 증가하였으며, 제올라이트가 5% 이상 혼입된 고화제는 인수기준 대비 1.4~1.7배 높은 압축강도를 나타내었다. 모든 시험체의 세슘 침출지수는 6 이상으로 인수기준을 만족하였으며, SA의 침출지수는 OPC 대비 1.47~1.63배 높게 나타났다. 특히, 제올라이트 5% 치환 고화제의 28일 이후 평균 침출지수는 9.15으로 OPC 대비 약 6.4% 향상되었으며, 전 기간 동안 안정적인 성능을 나타내어 제올라이트가 세슘이온에 대한 침출저항성 향상에 효과적임을 확인하였다.

Keywords

Acknowledgement

본 연구는 산업통상자원부(MOTIE)와 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 연구 과제입니다(No. 20203210100150).

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