콘크리트학회논문집 (Journal of the Korea Concrete Institute)

  • 제14권5호
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  • Pages.708-717
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  • 2002
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  • 1229-5515(pISSN)
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  • 2234-2842(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
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콘크리트 구조물의 단일 및 복합열화 환경하에서의 염소이온 확산특성

Diffusion Characteristics of Chloride ion under Single and Combined Attacks in Concrete Structures

  • 발행 : 2002.10.01
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⟨ 이전 논문 다음 논문 ⟩

초록

해안 등 열악한 환경에 노출되는 구조물들의 건설이 증가되면서 구조물의 내구성 문제가 심각해지고 있다. 특히, 염해만이 아니라 염해와 황산염 그리고 중성화 등 복합작용에 의한 열화문제는 아직도 연구된 바가 거의 없는 실정이다. 따라서, 본 연구에서는 염해와 황산염 및 중성화가 복합된 환경하에서 콘크리트 구조물의 성능저하 현상을 살피고 이들의 상호작용과 영향을 실험적으로 구명하는데 그 목적을 두고 있다. 이를 위해서 단일 및 복합열화 실험을 포괄적으로 수행하였다. 본 연구결과, 염소이온 단일열화시 보다 황산염 또는 황산염과 중성화가 복합되었을 경우의 열화현상이 더 두드러졌으며, 모든 열화조건에서 표면염소이온의 농도는 시간에 따라 증가하고 반면에 확산계수는 시간에 따라 감소하는 경향을 나타냈다. 표면염소이온 농도는 복합열화에서 더 증가하며 특히 염소이온 확산계수는 염해와 황산염 2중 복합열화시 더 커지고 여기에 중성화가 복합될 경우 더욱 커지는 것으로 나타났다. 따라서, 해안 구조물과 같이 염해와 황산염 및 중성화가 복합될 경우 염소이온의 침투가 더욱 커져 이들의 합리적인 고려가 필요한 것으로 나타났다.

Durability is a major concern in the design and construction of concrete structures which are located in the sea environments. In particular, the combined action of chlorides, sulfates, and carbonation nay influence greatly the deterioration behavior of concrete structures. The purpose of the present study is to explore the diffusion characteristics of chloride ions in concrete structures under combined deterioration conditions. The present test results indicate that the chloride penetration into concrete structures is more pronounced under combined attacks of chlorides, sulfates and carbonation. The diffusion coefficients and surface chloride contents were found to increase under combined multiple deterioration conditions. The present study provides quantitatively the penetration and diffusion characteristics of chloride ions in concrete structures under various deterioration conditions. The results of present study may be efficiently used for the realistic design of concrete structures under combined deterioration conditions.

키워드

참고문헌

  1. 오병환 외, "고함량 플라이애쉬 콘크리트의 개발 및 실용화 연구," 서울대학교 기초전력공학공동연구소, 1997. 12.
  2. 박영식, 서진국, 이재훈, 신영식, "황산염의 침해를 받는 고강도 콘크리트의 강도특성과 물성변화," 콘크리트학회 논문집, 제10권 5호, 1998, 10, pp.117-128.
  3. 오병환 외, "해수의 영향을 받는 콘크리트 구조물의 수명증가에 따른 영향 연구(II)," 한국원자력안전기술원, 1999. 2.
  4. 오병환 외, "원전격납건물 구조재료의 열화실험 및 열화모델개발, "한국원자력연구소, 2001. 3.
  5. James R. Clifton and Lawrence I. Knab, "Service Life of Concrete," NISTIR 89-4086, National Bureau of Standards U.S. Department of Commerce,1989.
  6. James R. Clifton, "Predicting the Remaining Service Life of Concrete," NISTIR 4712, National Bureau of Standards U.S. Department of Commerce, 1991.
  7. Haque, M. N. and Kawamura, M. "Carbonation and Chloride-Induced Corrosion of Reinforcement in Fly Ash Concretes," ACI Materials Journal, 1992, pp.41-48.
  8. Tang, L. P. and Nilsson, L. O., "Rapid Determination of the Chloride Diffusivity in Concrete by Applying an Electrical Field," ACI Materials Journal, 1992, pp.49-53.
  9. Tikalsky, P.J. and Carrasquillo, R. L., "Influence of Fly Ash on the Sulfate Resistance of Concrete," ACI Materials Journal, 1992, pp.69-75.
  10. Liam, K.C., Roy, S. K, and Northwood, D. O., "Chloride Ingress Measurements and Corrosion Potential Mapping Study of A 24-Year- Old Reinforced Concrete Jetty Structure in A Tropical Marine Environment," Magazine of Concrete Rearch, 1992, 44, No 160, September, pp.205-215. https://doi.org/10.1680/macr.1992.44.160.205
  11. Omar Saeed Baghabra AI-Amoudi, Mohammed Maslehuddin, "Role of Chloride Ions on Expansion and Strength Reduction in Plain and Blended Cements in Sulfate Environments," Construction and Building Materials, Vol. 9, No. 1, 1995, pp.25-33. https://doi.org/10.1016/0950-0618(95)92857-D
  12. Kdroff, J. and Hilsdorf, H. K, "Performance Creteria for Concrete Durability," Rilem Report 12, E & FN Spon, London, 1995.
  13. Thomas, M., "Chloride Thresholds in Marine Concrete," Cement and Concrete Research, Vol. 26, No. 4, 1996, pp.513 - 519. https://doi.org/10.1016/0008-8846(96)00035-X
  14. Tumidajski, P.J. and Chan, G. W., "Effect of Sulfate and Carbon Dioxide on Chloride Diffusivity," Cement and Concrete Research, Vol. 26, No. 4, 1996, pp.551 - 556. https://doi.org/10.1016/0008-8846(96)00019-1
  15. Sarja, A. and Vesikari, E., "Durability Design of Concrete Structures," E & FN SPON, 1996.
  16. ASTM C1152-97 "Standard Test Method for Acid-Soluble Chloride In Mortar and Concrete," 1997.
  17. Alkhaiat, H. and Haque, M. N., "Carbonation of Some Coastal Concrete Structures in Kuwait," ACI Materials Journal, 1997, pp.602-607.
  18. Ngala, V. T. and Page, C. L. "Effects of Carbonation on Pore Structure and Diffusional Properties of Hydrated Cement Pastes," Cement and Concrete Research, Vol. 27, No. 7, 1997, pp.995-1007. https://doi.org/10.1016/S0008-8846(97)00102-6
  19. Khatri, R.P., Sirivivatnanon, V., and Yang, J. L., "Role of Permeability in Sulphate Attack," Cement and Concrete Research, Vol. 27, No. 8, 1997, pp.1179-1189. https://doi.org/10.1016/S0008-8846(97)00119-1
  20. Oh, B. H, Chang, B. S., Cha, S. W., and Chung, W. K, "An Experimental Study on the Properties of High-Performance Concrete," High Performance Concrete : Design and Materials and Recent Advances in Concrete Technology, Supplementary Papers, ACI International Conference, Kuala Lumpur, Malaysia, 1997. pp.335-342.
  21. Guide to Durable Concrete-ACI 201.2R-92, ACI Manual of Concrete Practice, American Concrete Institute, 1998.
  22. Konin, A, Francois, R, and Arliguie, G. "Penetration of Chlorides in Relation to the Microcracking State Into Reinforced Ordinary and High Strength Concrete," Materials and Structures, Vol. 31, 1998. 6. pp.310-316. https://doi.org/10.1007/BF02480672
  23. Sandberg, P., Tang, L., and Andersen, A, "Recurrent Studies of Chloride Ingress in Uncracked Marine Concrete at Various Exposure Times and Elevations," Cement and Concrete Research, Vol. 28, No. 10, 1998, pp.1489 -1503. https://doi.org/10.1016/S0008-8846(98)00124-0
  24. Costa, A and Appleton, J., "Chloride Penetration Into Concrete in Marine Environment -Part I : Main Parameters Affecting Chloride Penetration," Materials and Structures, Vol. 32, May 1999, pp.252 - 259. https://doi.org/10.1007/BF02479594
  25. Costa, A. and Appleton, J., "Chloride Penetration Into Concrete in Marine Environment -Part II : Prediction of Long Term Chloride Penetration," Materials and Structures, Vol.32, June 1999, pp.354-359. https://doi.org/10.1007/BF02479627