Journal of the Korean Society of Hazard Mitigation (한국방재학회 논문집)

Korean Society of Hazard Mitigation (한국방재학회)
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Relationship between Chloride Diffusivity and the Fundamental Properties of Concrete

염소이온의 확산계수와 콘크리트의 기초물성과의 관계

  • 최두선 ((주)다산글로벌컨설팅) ;
  • 최재진 (공주대학교 건설환경공학부)
  • Published : 2009.02.28
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Abstract

Marine concrete structure is exposed to salt injury and deteriorated by steel corrosion due to chloride ions diffusion. It, therefore, is very important to estimate the chloride diffusivity in concrete. In this paper the compressive strength and permeable pore volume of concrete are measured and the diffusion coefficient and penetration depth of chloride ions in concrete were investigated to estimate the chloride diffusivity efficiently. To correlate these results each other, regression analysis was done. The results showed a good linear relation between chloride diffusivity and the fundamental properties of concrete and the chloride diffusivity of concrete with water-cement ratios of $40%{\sim}60%$ were about $2.5{\sim}6.6{\times}10^{-12}m^2/s$.

해양환경 하에 건설되는 콘크리트구조물은 다양한 염해 환경에 노출되어 있으며, 이중 염소이온의 침투 및 확산으로 인한 콘크리트 중의 철근부식과 화학적 침식 등은 콘크리트구조물의 주요 성능저하 요인으로 지적되고 있다. 따라서 해수 중의 염소이온의 침투 및 확산 메커니즘을 효율적으로 평가하기 위하여 전기화학적 촉진시험으로부터 염소이온의 확산계수를 추정하였다. 또한 콘크리트의 압축강도, 투수공극량 및 염소이온의 침투깊이 등과 염소이온의 확산계수와의 상관관계를 분석하기 위하여 회귀분석을 실시하였다. 본 연구의 시험결과에 의하면, 물-시멘트비 40~60%의 범위에서 보통콘크리트의 염소이온 확산계수는 $2.5{\sim}6.6{\times}10^{-12}m^2/s$ 정도였으며, 염소이온의 확산계수와 콘크리트의 물성과의 상관관계는 선형의 상관관계가 있었다.

Keywords

References

  1. 大卽信明(1982) 海洋還境下におけるコンクリ一トの鹽分含有量, セメント·コンクリ一ト, No.421. pp. 39-46
  2. JIS A 6203(1996) セメント混和用ポリマ一デイスパ一ジヨン及び再乳化形粉末樹脂 8.12 化物イオン浸透深さ
  3. ASSHTO T 277(1993) Electrical Indication of Concrete's Ability to Resist Chloride
  4. ASTM C 1202(1991) Standard Test Method for Electrical Indication of Concrete's Ability to Resist Chloride Ion Penetration
  5. ASTM C 642(1997) Standard Test Method for Density, Absorption and Voids in Hardened Concrete
  6. Andrade, C.(1993) Calculation of Chloride Diffusion Coefficients in Concrete from Ionic Migration measurements, Cement and Concrete Research, Vol. 23, pp.724-742 https://doi.org/10.1016/0008-8846(93)90023-3
  7. Berke, N.S., Hicks, M.C.(1994) Predicting Chloride Profiles in Concrete, Corrosion, March, pp.234-239 https://doi.org/10.5006/1.3293515
  8. Dhir, R.K., Uones, M.R., Ahmed, H.E.H., Seneviratne, A.M.G. (1990) Rapid Estimation of Chloride Diffusion Coefficient in Concrete, Magazine of Conctete Research, Vol. 42, No. 152, pp.177-185 https://doi.org/10.1680/macr.1990.42.152.177
  9. Mackechnie, J. R. and Alexander, M. G.(1997) Exposure of Concrete in Different Marine Environments, Journal of Materials in Civil Engineering, pp. 41-44 https://doi.org/10.1061/(ASCE)0899-1561(1997)9:1(41)
  10. Mangat, P.S., Molloy, B.T.(1994) Prediction of Long Term Chloride Concentration in Concrete, Materials and Structures, Vol. 27, pp.338-346 https://doi.org/10.1007/BF02473426
  11. Metha, P.K.(1993), Concrete; Structure, Properties, and Materials, 2nd Ed. Prentice Hall
  12. Moon, H.Y., Kim, H.S., Choi, D.S.(2006) Relationship Between Average Pore Diameter and Chloride Diffusivity in Various Concretes, Construction and Building Materials, Vol. 20, No. 9, pp.725-732 https://doi.org/10.1016/j.conbuildmat.2005.02.005
  13. Tang, L.(1996) Electrically Accelerated Methods for Determining Chloride Diffusivity in Concrete-Current Development, Magazine of Concrete Research, Vol. 48, No. 176, pp.173-179 https://doi.org/10.1680/macr.1996.48.176.173
  14. Tumidajski, P.J., Chan, G.W., Feldman, R.F., Strathdee, G.(1995) Boltzmann-Manato Analysis of Chloride Diffusion, Cement and Concrete Research, Vol. 25, pp.1556-1566 https://doi.org/10.1016/0008-8846(95)00149-7
  15. Whiting(1981) Rapid Determination of the Chloride Permeability of Concrete, Report No. FHWA/RD-81/119
  16. Zhang, T., Gj$\varnothing$rv, O.E.(1994) An Electrochemical Method for Accelerated Testing of Chloride Diffusivity in Concrete, Cement and Concrete Research, Vol. 24, No. 8, pp.1534-1548 https://doi.org/10.1016/0008-8846(94)90168-6