콘크리트학회논문집 (Journal of the Korea Concrete Institute)

  • 제15권6호
  • /
  • Pages.902-912
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  • 2003
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  • 1229-5515(pISSN)
  • /
  • 2234-2842(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
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중성화와 염해를 고려한 콘크리트의 복합열화 예측

Prediction of Deterioration Process for Concrete Considering Combined Deterioration of Carbonation and Chlorides Ion

  • 이창수 (서울시립대학교 토목공학과) ;
  • 윤인석 (서울시립대학교 토목공학과)
  • Lee, Chang-Soo (Dept. of Civil Engineering, The University of Seoul) ;
  • Yoon, In-Seok (Dept. of Civil Engineering, The University of Seoul)
  • 발행 : 2003.12.01
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초록

전 세계적으로 콘크리트 구조물의 열화를 발생하는 가장 중요한 원인은 중성화와 염소이온이다. 대체적으로 많은 콘크리트 구조물에서 염소이온과 중성화로 인하여 철근이 부식되며 이에 대한 많은 연구가 이루어지고 있다. 그러나 실구조물의 상황은 염소이온과 중성화가 복합적으로 발생함에도 불구하고 많은 연구들이 각각의 단일열화에 대한 연구가 이루어지고 있으며 복합열화에 대한 연구는 매우 드문 상황이다. 본 연구는 2중 복합 매체에 대한 확산모델을 이용하여 중성화된 콘크리트의 염소이온 프로파일을 예측하고자 하였다. 실험결과에 의하여 중성화 깊이로부터 3∼5 mm영역에 염소이온의 농축현상이 발생하였으며 2중 복합 구조체에 적용할 수 있는 확산 방정식에 중성화된 콘크리트와 비중성화된 콘크리트의 시간의존적인 염소이온 확산 계수를 고려하여 내구수명예측에 반영하였다.

The most common deteriorating processes of concrete structures are carbonation and chloride ion ingress. Many concrete structures have been suffered from chloride ions diffusion or carbonation induced reinforcement corrosion damage and many studies have been done on it. However, those studies were confined mostly to the single deterioration of carbonation or chloride attack only, although actual environment is rather of combined conditions. In case of many in-situ concrete structures, deterioration happened more for the case of combined attack than the single case of carbonation or chloride attack. In this paper, chloride profiles of carbonated concrete is predicted by considering two layer composite model, which is based on Fick's 2nd law. From the experimental result on combined deterioration of chloride and carbonation, it was examined that high chloride concentration was built up to 3∼5 mm over depth from carbonation depth. The analytical modeling of chloride diffusion was suggested to depict the relative influence of the carbonation depth. The diffusion coefficients of carbonation concrete and uncarbonated concrete with elapsed time were considered in this modeling.

키워드

참고문헌

  1. 이창수, 설진성, 윤인석, '서울시내 140개 철근콘크리트 교량의 내구성 현황 분석', 한국구조물진단학회지,4권, 3호, 2000, pp.161-168
  2. 이창수, 설진성, 윤인석, 이규동, '해양성환경에 위치한 RC 구조물의 현장조사에 의한 내구수명예측 시도', 한국콘크리트학회, 가을학술발표회 논문집, 12권,2호, 2000
  3. 이창수, 윤인석, 박종혁, '제병화학제 살포로 인한 콘크 리트 교량 바닥판의 철근부식 시작시기의 예측,' 콘크리트학회 논문집, 15권, 4호, 2003, pp.606-614
  4. EB,: 'Durable Concrete Structures: Desin Guide,'2nd Edition Thomas Telford, London, 1992
  5. '複合劣化コンクリ-ト構造物の評價と維持管理計劃硏究委員會 報告書', 社團法人 日本コンクリ-ト工學協會, 2001
  6. '大井埠頭棧橋劣化調査.補修マニュアル(案)', 財團法人 東京港埠頭公社,1997
  7. 小林一輔 감, '鹽化物を含んだコンクリ-トの炭酸化による鹽素の濃縮現象 (ll)', 生産硏究, 苐41卷, 苐4号, 1989, pp.
  8. 小林一輔 등, "コンクリ-トの炭酸化による硫酸化の移動と濃縮現象 (I),' 生産硏究, 제41卷, 제12호, 1989,pp.940-943
  9. 岸谷孝- 등, "鹽化物を含むフンクリ-ト中における鐵筋腐食と中性化の開係,' コンクリ-ト工學論文集, 제2卷, 제1호, 1991, pp.77~84
  10. 小林一輔 등, "炭酸化によって引き起こされるコンクリ-ト中の鹽化物, 硫酸化合物及びアルカリ化合物の移動と濃縮', コンクリ-ト工學論文集, 苐2卷, 苐1号,1990, pp. 69-82
  11. 이창수, 윤인석, '대기환경변화를 고려한 콘크리트 구조물의 중성화 예측,' 콘크리트학회논문집, 15권, 4호,2003, pp.578-588
  12. Byfors J., 'Plain Concrete at Early Age,' SwedishCement and Concrete Research Institute, 1980
  13. Bentz D.P. and Garboczi E.J., "Modeling Leaching ofCalcium Hydroxides from Cement Paste: Effects onPore Space Percolation and Diffusivity,' Materialsand Structures, Vol.25, 1992, pp.523-533 https://doi.org/10.1007/BF02472448
  14. Cha S.W., 'Modeling of Hydration Process and Analysis qf Thermal and Hygral Stresses in Hardening Concrete,' Ph.D Thesis, Seoul National University, Seoul, Korea, 1999
  15. Andrade C., Diez J.M, and Alonso C., 'MathematicaIModeling of a Concrete Surface Skin Effect onDiffusion in Chloride Contaminated Media,'Advanced Cement Based Materials, Vol.6, 1997,pp.39-44 https://doi.org/10.1016/S1065-7355(97)00002-3
  16. 윤인석, '중성화와 염소이온의 복합열화를 고려한 콘크리트구조물의 내구수명예측', 공학박사학위논문, 서울시립대학교, 2003
  17. Uji K, Matsudaka Y., and Maruya T, 'Formulationfor Surface ChIoride Content of Concrete Due toPermeation cf Chloride,' Corrosion of Reinforcementin Concrete, Page C.L, Treadaway K.W.J.V Page,and Bamforth P.B(ds.), Elsevier Appld Science, NewYork, 1990, pp.258-267
  18. Weyers R.E, Michael G. Fitch, Erin P. Larsen,Imad L. Al-Qadi, W.P. Chamberlin, and Paul C.Hoffman, 'Concrete Bridge Protection andRehabilitation: Cheical and Physical Techniques,Service Life Estimates,' SHRP-S-668, StrategicHighway Research Program, Washington, 1994,pp.156-164
  19. CEB Belletin d'lnformation No.243, Strategies forTesting and Assessment of Concrete Structures,CEB-FIP, May, 1998, pp.142~149
  20. 竹田宣典, 十河戊辛, 迫田專三, 出光陸, '種ヮの海洋環境條件におけるコンクリ一トの鹽分浸透と鐵議筋腐食に關する實驗的硏究,' 土木學會論文集, 日本土木學會,No.599, Vol.40, 1998, pp.91-104
  21. Kassir M.K., Ghosn M, 'Chloride-induced Corrosionof Reinforced Concrete Bridge Decks,' Cement andConcrete Research Vol.32 2002, pp.139-143 https://doi.org/10.1016/S0008-8846(01)00644-5
  22. AroraP, Popov B.N., HaranB., M. Ramasubramanian,S. Popova, and R.E. White, 'Corrosion Initiadon Time of Steel Reinforcement in a ChlohdeEnvironment A One Dimensional Solution,'Corrosion Science, Vol.39, No.4, 1997, pp.739-759 https://doi.org/10.1016/S0010-938X(96)00163-1
  23. Wee T.H., Wong S.F., S. Swaddiwudhipong, and S.L. Lee, 'A Prediction Method of Long-Term Chloride Concentration Profiles in Hardened Cement Matrix Matrials,' ACI Materials JournaI, Vol.94,No.6, 1998, pp.565~576
  24. Bamforth P.B. and Price W.F., 'An InternationalReview of Chloride Ingress into Structural Concrete,'Report No.303/969092, Taywood Engineenng Ltd.Technology Division, 1997
  25. Maage M., Helland S., and Carlsen J.E., "Practical Non-Steady State Chloride Transport as a Part of a Model for Predicting the Initiation Period,'Proceeding IntenationaI RILEM Workshop:Chloride Penetration Into Concrete, Oct.15-18, Saint-Remy-Les-Chevreuses, 1995, pp.398-406
  26. Mangat P.S. and Molloy B.T., 'Prediction of LongTerm Chloride Concentration in Concrete' Materialand Structural, Vol.27, 1994, pp.338-346 https://doi.org/10.1007/BF02473426
  27. Bamforth P.B. and Price W.F., 'Ai InternationaIReview of Chloride Ingress into Structural Concrete,'Report No.303/969092, Taywood Engineering Ltd.Technology Division, 1997
  28. Tekewaka K. and Mastumoto S., 'Quality and CoverThickness of Concrete Based on the Estimation ofChloride Penetration in Marine Environments,'ACI-SP 109-117, Concrete Marine Environment,Detroit, 1988, pp.381-400
  29. Kanaya M., Masuda Y., ABE M., and Nishiyaman.,'Diffusion of Chloride ions in Concrete Exposed inthe Costal Area,' Gjrv O.E., Sakai K. and BanthiaN.(Eds.), Concrete Under Severe Condition 2, Vol.1,1998, pp.242~249
  30. 佐伯龍彦 등, "鹽害と中性化の複合による鹽化物イオン浸透豫測モデルの構築,' 土木學會論文集, 日本土木學會, 제69卷, 2002, pp.131-142
  31. John P. BroomSeld, 'Corrosion of SteeI in Concrete- Understanding, Investigation and Repair," E &FN SPON, 1997, pp.16-19
  32. Henriksen C., Ladefoged L., and Thaulow N.,'Concrete Specifications for New Bridges,' BridgeManagement 3, J.E. Harding, G.A.R. Parke, and MJ.Ryall (Eds.), E & FN SPON, 1996, pp.124-137
  33. Hobbs D.W. and Matthews, 'Minimum Require-ments for Concrete to Resist Deterioration due toChloride Induced Corrosion.' Minimum Require-ments for DurabIe Concrete,' D.W. Hobbs (Eds.).Bhtish Cement Association, Crowthorne, UK, 1998,pp.43-89
  34. Lin S.H., 'Chloride Diffusion in a Porous ConcreteSlab,' Corrosion, Vol.46, No.12, National Associationof Corrosion Engineers, 1990, pp.964-967
  35. Papadakis V.G., Roumeliotis A.P., Fardis M.N., andVagenas C.G., 'Mathematical Modeling ChIorideEffect on Concrete Durabitity and ProtectionMeasures,' Concrete Repair, Rehabilitation andProtection, R.K.-Dhir, M.R. Jones (Eds.), London(UK),E & FN SPON, 1996, pp.165-174
  36. Luciano J. and Miltenberger M., 'Prediction Chloride Diffusion Coefficient from Concrete Mixture Properties,' ACI Materiats Journal, 96-M86, 1999,pp.698-703
  37. 日本土木學會, 'コンクリ-ト標準視方書-施工編, 耐久性照査型 改訂資料,' 1999
  38. 문한영, 김성수, 류재석, 김성섭, '해양환경하에 있는콘크리트 구조물의 염해에 대한 고찰,' 한국콘크리트학회 봄학술발표회논문집, 8권, 1호, 1996, pp.83-88

피인용 문헌

  1. Influence of carbonation on ionic transport in unsaturated concrete: evolution of porosity and prediction of service life pp.2116-7214, 2018, https://doi.org/10.1080/19648189.2018.1455609