콘크리트학회논문집 (Journal of the Korea Concrete Institute)

  • 제28권3호
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  • Pages.341-348
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  • 2016
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  • 1229-5515(pISSN)
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  • 2234-2842(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
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순환 골재 부착 이질재의 탄산화 개질에 따른 공극구조 및 물리적 특성

Pore Structure and Physical Properties of Heterogeneous Bonding Materials of Recycled Aggregate according to Carbonation Reforming

  • 신진학 (단국대학교 건축공학과) ;
  • 김한식 (삼성물산 건설부문 주거성능연구소) ;
  • 정란 (단국대학교 건축공학과) ;
  • 하정수 (단국대학교 건축공학과)
  • Shin, Jin-Hak (Dept. of Architectural Engineering, Dankook University) ;
  • Kim, Han-Sic (Residential Engineering Team, Samsung C&T Co. Ltd. Engineering & Construction Group) ;
  • Chung, Lan (Dept. of Architectural Engineering, Dankook University) ;
  • Ha, Jung-Soo (Dept. of Architectural Engineering, Dankook University)
  • 투고 : 2015.12.03
  • 심사 : 2016.02.11
  • 발행 : 2016.06.30
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초록

현재, 해체되는 콘크리트는 연간 4000만톤에 이르고 있고, 전체 건설폐기물 중에서 60.8%로서 가장 큰 비중을 차지하고 있으며, 그 중의 약 97.5%는 재활용 되고 있는 것으로 알려져 있다. 그러나, 이러한 폐 콘크리트의 사용용도는 대부분 저부가가치 산업에 머물고 있는 실정이며, 향후 건축물의 노후화로 더욱 증가하는 폐 콘크리트의 발생량을 감안하면 구조용 콘크리트로의 전용이 절실하다. 따라서, 본 연구에서는 순환 골재를 구조용 콘크리트로의 적용을 위하여 부착 이질재(시멘트 페이스트 및 모르타르)의 촉진 탄산화 개질 방법을 이용하여 순환 골재의 품질 향상을 위한 최적 개질 기간의 추정을 목적으로 한다. 선행 연구를 통해 도출된 순환 골재의 부착 이질재 두께와 각 부착 두께에 적합한 탄산화 기간을 바탕으로 촉진 탄산화 진행에 따른 공극구조 특성 및 물리적 특성 변화를 분석하였다. 그 결과, 탄산화가 진행됨에 따라 부착 이질재의 세공량과 흡수율이 감소하고, 밀도는 증가하여 품질이 향상되는 경향을 나타내었으나, 일정 재령 이후에는 경향이 역전되어 품질이 저하하는 결과를 나타내었다. 따라서, 선행 연구 결과와 본 연구 시험 결과를 종합하여 순환 잔 골재와 순환 굵은 골재의 최적 탄산화 개질기간을 각각 4일, 14일로 제안하였다.

At present, about 40 million tons of concrete is dismantled each year, which accounts for the largest portion of the total amount of construction waste with 60.8%. It is known about 97.5% of it is recycled. However, most of the usage of waste concrete is limited to lower value-added business areas, and considering the increasing amount of waste concrete generated due to the deterioration of structures, the need for converting waste concrete to structural concrete is urgent. Therefore, this study aims at estimating the period for the optimum carbonation reforming to improve the quality of recycled aggregate, by making use of the method of accelerated carbonation reforming of the bonding heterogeneous (cement paste and mortar) for the purpose of converting recycled aggregate to structural concrete. Based on the period appropriate for the heterogeneous thickness and each bonding thickness of recycled aggregate which was drawn from previous studies, the changes in the characteristics and physical properties of pore structure according to progress of accelerated carbonation were analyzed. The result shows that with the progress of carbonation, the pore volume and the percentage of water absorption of the bonding heterogeneous decreased and the density increased, which indicates improvement of the product quality. But after certain age, the tendency was reversed and the product quality deteriorated. Synthesizing the results of previous studies and those of the present study, this study proposed 4 days and 14 days respectively for the period for the optimum carbonation reforming of recycled fine aggregate and recycled coarse aggregate.

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참고문헌

  1. Korea Environment Corporation, Generation and Processing Status of National Waste(2013), No. KECO2014-PE14-38, Ministry of Environment, 2014. pp.22-30.
  2. Waste Resources Management Division, Construction Waste Recycling Promotion Act, Law No. 13527, Ministry of environment, 2015, pp.1-20.
  3. Technology Policy Division, Quality Standard of Recycled Aggregate, Bulletin No. 2013-92, Ministry of Land, Infrastructure and Transport, 2013, pp.5-82.
  4. Tam, V.W.Y., Gao, X.F., and Tam, C.M., "Microstructural analysis of recycled aggregate concrete produced from two-stage mixing approach", Cement and Concrete Research, Vol.35, No.6, 2005, pp.1195-1203. https://doi.org/10.1016/j.cemconres.2004.10.025
  5. Xiao, J., Li, W., Fan, Y., and Huang, X., "An overview of study on recycled aggregate concrete in China (1996-2011)", Construction and Building Materials, Vol.31, 2012, pp.364-383. https://doi.org/10.1016/j.conbuildmat.2011.12.074
  6. Behnood, A., Gharehveran, M.M., Asl, F.G., and Ameri, M., "Effects of copper slag and recycled concrete aggregate on the properties of CIR mixes with bitumen emulsion, rice husk ash, Portland cement and fly ash", Construction and Building Materials, Vol.96, 2015, pp.172-180. https://doi.org/10.1016/j.conbuildmat.2015.08.021
  7. Cakir, O., and Sofyanli, O.O., "Influence of silica fume on mechanical and physical properties of recycled aggregate concrete", Housing and Building National Research Center Journal, Vol.11, No.2, 2015, pp.157-166.
  8. Akca, K.R., Cakir, O., and Ipek, M., "Properties of polypropylene fiber reinforced concrete using recycled aggregates", Construction and Building Materials, Vol.98, 2015, pp.620-630. https://doi.org/10.1016/j.conbuildmat.2015.08.133
  9. Cartuxo, F., de Brito, J.. Evangelista, L., Jimenez, J.R., and Ledesma, E.F., "Rheological behaviour of concrete made with fine recycled concrete aggregates - Influence of the superplasticizer", Construction and Building Materials, Vol.89, 2015, pp.36-47. https://doi.org/10.1016/j.conbuildmat.2015.03.119
  10. Alexander, S.B., Jefferay, R.R., and Andres, S., "Initial moisture and mixing effects on higher quality recycled coarse aggregate concrete", Construction and Building Materials, Vol.79, 2015, pp.83-89. https://doi.org/10.1016/j.conbuildmat.2015.01.047
  11. Zhang, H., Zhao, Y., Meng, T., and Shah, S.P., "The modification effects of a nano-silica slurry on microstructure, strength, and strain development of recycled aggregate concrete applied in an enlarged structural test", Construction and Building Materials, Vol.95, 2015, pp.721-735. https://doi.org/10.1016/j.conbuildmat.2015.07.089
  12. Song, I.H., and Ryou, J.S., "Hybrid techniques for quality improvement of recycled fine aggregate", Construction and Building Materials, Vol.72, 2014, pp.56-64. https://doi.org/10.1016/j.conbuildmat.2014.08.041
  13. Power, T.C., A Hypothesis of Carbonation Shrinkage, Journal of the PCA Research and Development Laboratories, Vol.4, No.2, 1962, pp.40-50.
  14. Yamada, J., Ariizumi, M., Knowledge of Descriptive Cement and Concrete, Kajima Co., 1989, pp.71-76.
  15. Mehta, P.K., and Monteiro, P.J.M., Concrete : Microstructure, Properties and Materials : Third edition, McGraw-Hill, New York, 2005. p.31.
  16. Kunieda, Y., Research on Low-Quality Recycled Aggregate Reforming Technology by Accelerated Carbonation, Graduate School of Engineering, University of Tokyo master's thesis, 2010, pp.139-140.