Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Physical and Chemical Properties of Atomizing EFOS as Fine Aggregate for Concrete

아토마이징 전기로 산화슬래그 잔골재의 물리·화학적 특성

  • Beom-Soo Kim (CSM Tech) ;
  • Sun-Mi Choi (Department of Architectural Engineering, Kongju National University) ;
  • Sang-Chul Shin (Department of Architectural Engineering, Kongju National University) ;
  • Sun-Gyu Park (Department of Architectural, Mokwon University) ;
  • Jin-Man Kim (Department of Architectural Engineering, Kongju National University)
  • 김범수 (씨에스엠테크) ;
  • 최선미 (공주대학교 그린스마트건축공학과) ;
  • 신상철 (공주대학교 그린스마트건축공학과) ;
  • 박선규 (목원대학교 건축학과) ;
  • 김진만 (공주대학교 그린스마트건축공학과)
  • Received : 2023.02.02
  • Accepted : 2023.03.07
  • Published : 2023.03.30
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Abstract

Blast furnace slag, a by-product of the steel industry, is mostly recycled as concrete admixture, but electric arc furnace slag has not been recycled to date. In particular, since electric arc furnace slag partially contains free lime (free-CaO) in the discharge, it is necessary to review this in order to recycle f or construction materials. Recently an atomizing process which is a method of rapidly cooling electric arc furnace slag has been developed and applied. Therefore, in order to use the fine aggregate of oxidized slag from electric furnace restored by this method as an aggregate for concrete, physical damage and chemical reviewing are required. In this study, a physical and chemical review was conducted on the fine aggregate of Electric Arc Furnace Oxidizing Slag (EFOS) as a by-product of the steel manufacturing process with atomizing process. In this experimental study, EFOS was experimentally examined about whether it can be used as concrete fine aggregate. Also, we intend to provide basic data for the future use of the EFOS fine aggregate. As a result of the experimental study, it was found that the fine aggregate of the EFOS satisfied the quality standards of the fine aggregate for concrete in most items specified by Korean Standard.

철강산업 부산물인 고로슬래그는 대부분이 콘크리트 혼화재 등으로 재활용되고 있지만, 제강슬래그는 아직까지 뚜렷한 재활용 용도가 마련되지 않고 있다. 특히 제강슬래그는 배출과정에 있어서 다량의 유리석회(Free CaO)를 함유하고 있어, 유리석회에 의한 팽창 붕괴성을 가지고 있기 때문에 콘크리트용 골재로 재활용하기 위해서는 이에 대한 검토가 필요한 실정이다. 최근에는 고온의 액상 제강슬래그를 고압의 압축공기로 분무하여 슬래그를 매우 작은 크기의 입자로 공기 중에 노출시킴으로써 급냉하는 방식인 아토마이징 공정이 개발되어 적용되고 있다. 따라서 이러한 방법으로 배출되는 전기로 산화슬래그 잔골재를 콘크리트용 골재로 사용하기 위해서는 충분한 물리·화학적 검토가 필요하다. 본 연구에서는 국내 E사에서 철강제조 공정의 부산물로 배출되는 전기로 산화슬래그 잔골재를 대상으로 물리·화학적 검토를 실시하였다. 즉, 아토마이징 공정을 통해 생산되는 전기로 산화슬래그 잔골재가 콘크리트용 골재로서 사용 가능한가에 대하여 실험적으로 검토함으로써 향후 전기로 산화슬래그 잔골재의 활용에 기초적인 자료를 제공하고자 한다. 실험결과, 전기로 산화슬래그 잔골재는 대부분의 항목에서 콘크리트용 잔골재의 품질규준을 만족하고 있는 것으로 나타났다.

Keywords

Acknowledgement

본 논문은 한국연구재단의 이공분야기초연구사업 중 중견연구자지원사업(과제번호 2020R1A2C2013161) 및 창의도전연구기반 지원(No. 2020R1I1A1A01074492)의 지원을 받아 수행한 연구로 이에 감사드립니다. 또한 본 논문은 현대제철의 '철강슬래그의 고부가가치적 활용 연구' 수행을 위한 원료 제공을 통해 진행된 연구로서 이에 감사드립니다.

References

  1. Cho, B.S., Lee, H.H., Yang, S.K., Lee, W.J., Um, T.S. (2009). Appraisal of concrete performance and plan for stable use of EAF oxidizing slag as fine aggregate of concrete, Journal of the Korea Concrete Institute, 21(3), 367-375. https://doi.org/10.4334/JKCI.2009.21.3.367
  2. Choi, S.W., Back, C.W., Ryu, D.H., Son, Y.S., Park, C.G., Kim, K.H. (2010). An experimental study on the basic properties of high strength concrete, using oxidized electric-furnace-slag aggregate, Proceedings of the Korea Concrete Institute Conference, 22(1), 251-252.
  3. Gajda, J. (2001). Absorption of Atmospheric Carbon Dioxide by Portland Cement, PCA, R&D, Chicago, USA.
  4. Han, S.I., Lee, W.Y., Park, H.J., Choi, H.G., Kwak, E.G., Kim, J.M. (2009). A fundamental study on the fluidity properties of normal concrete using fine aggregate with rapidly cooled electric arc furnace oxidizing slag, Proceedings of the Korea Concrete Institute, 21(1), 333-334.
  5. Kim, J.H., Lee, M.J., Ra, J.M., Choi, S.M., Bae, K.S., Kim, J.M. (2011). Quality properties of fine aggregate from rapidly cooled EAF slag, Proceedings of the Korea Concrete Institute Conference, 23(1), 469-470.
  6. Kim, J.M., Kwak, E.G., Choi, S.M., Kim, J.H., Lee, W.Y., Oh, S.Y. (2012). Properties of mortar according to gradation change of electric arc furnace oxidizing slag fine aggregate made by rapidly cooled method, Journal of the Korean Recycled Construction Resources Institute, 6(4), 112-118.
  7. Kim, K.H., Lim, J.Y., Ryu, D.H., Choi, S.W. (2007). The present situation of production and it's utilization of electronic arc furnace oxidizing slag in korea and other countries, Magazine of the Korea Concrete Institute, 19(6), 51-57.
  8. Kim, K.S., Bae, I.K., Seo, J.B., Choi, J.S., Lee, Y.K., Kim, H.S. (2015). Properties of reformed electric arc furnace slag as cement admixtures, Resources Recycling, 24(6), 31-37. https://doi.org/10.7844/kirr.2015.24.6.31
  9. Korea Iron & Steel Association (2021). https://www.kosa.or.kr/
  10. KS F 2502. (2019). Method of Test for Sieve Analysis of Aggregates, Seoul, Korea.
  11. KS F 2504. (2020). Method for Density and Water Absorption Rate of Fine Aggregates, Seoul, Korea.
  12. KS F 2505. (2022). Method for Bulk Density and Solid Contents in Aggregates, Seoul, Korea.
  13. KS F 2527. (2022). Concrete Aggregate, Korean Standards Association, Seoul, Korea.
  14. Kwak, E.G., Kim, J.M. (2010). Evaluation of application for the concrete aggregate of electric arc furnace oxidizing slag treated by rapidly cooling method, Journal of the Architectural Institute of Korea: Structure & Construction, 26(2), 63-70.
  15. Lee, J., Yoon, B., Choo, H., Lee, W., Lee, C. (2020). Effect of hydration on swelling properties and shear strength behavior of MgO-sand mixture, Journal of the Korean Geotechnical Society, 36(11), 97-106. https://doi.org/10.7843/KGS.2020.36.11.97
  16. Lim, H.S., Lee, H.S. (2017). Study on performance evaluation of concrete using electric arc furnace oxidizing slag aggregate, Journal of the Korea Institute for Structural Maintenance and Inspection, 21(4), 97-103.
  17. Ryu, D.H. (2009). The prospect for utilization of electronic arc furnace oxidizing slag as concrete's aggregate, Magazine of RCR, 4(1), 17-25.
  18. Yoon, J.K., Sim, J.D. (2004). Introduction to Ferrous Metallurgy, DaeWoong, Korea.