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Chloride Diffusion in Hardened Concrete with Concrete Properties and Testing Method

콘크리트 물성 및 시험법에 따른 콘크리트 염화물 확산

  • Yang Eun-Ik (Dept. of Civil Engineering, Kangnung National University) ;
  • Kim Myung-Yu (Dept. of Civil Engineering, Kangnung National University) ;
  • Min Seok-Hong (Dept. of Metal & Materials Engineering, Kangnung National University)
  • 양은익 (강릉대학교 토목공학과) ;
  • 김명유 (강릉대학교 토목공학과) ;
  • 민석홍 (강릉대학교 금속재료공학과)
  • Published : 2004.04.01

Abstract

Corrosion of reinforcement is the main cause of damage and early failure of reinforced concrete structures. The corrosion is mainly progressed by the chloride ingress. In this paper, an experimental study is executed to investigate the effect of concrete properties and testing methods on the coefficients of chloride diffusion. Also, it is surveyed the relationship between total chloride and free chloride in concrete. According to this experiment results, W/C ratio and testing method affect chloride diffusion coefficient of concrete. As W/C ratio is increased, diffusion coefficient in concrete is also increased. Diffusion coefficient obtained by each testing method show the different values, respectively. The model equation of diffusion coefficient with W/C ratio is proposed.

RC 구조물이 해양 환경에 노출되거나 염화물 환경에 놓이면 콘크리트 속의 매립철근의 부식이 발생한다. 철근의 부식은 구조물의 내구성을 감소시키게 되며, 이러한 부식은 염화물의 침투로 인해 발생하게 된다. 이에 본 연구에서는 염화물 침투실험을 통하여 콘크리트 물성과 시험법이 염화물 확산에 미치는 영향을 살펴보았다. 실험 결과에 따르면, W/C비와 시험법 모두 콘크리트의 확산계수에 영향을 미치는 것으로 나타났다. W/C비가 증가함에 따라 확산계수도 증가하였으나, 비례하여 증가하지는 않았다. 또한, 시험법에 따른 확산계수의 경우, W/C비의 영향은 잘 반영하나 시험법에 따라 확산계수의 차이가 보인다. 본 연구에서는 W/C비에 따른 확산계수 추정식을 제안하였다.

Keywords

References

  1. 문한영외, '해양환경하에 위치한 구조물의 내구성 저하', 한국콘크리트학회, 연구소 위원회 발표집, 2002, pp.57-72
  2. 오병환외, '콘크리트 구조물의 염화물 확산거동 및 침투해석', 한국콘크리트학회, 연구소위원회보고서, 2001. pp. 201-223
  3. 신도철, 손형호, 김영웅, '염해환경 하에서의 콘크리트 내구성 증진에 대한 고찰', 콘크리트학회지 14권 2호, 2002, pp.103-109
  4. 'Standard Method of Test for Resistance of Concrete to Chloride lon Penetration,' (T259-80), American Assodation of State Highway and Transportation Officials, Washington, D.C., U.S.A., 1980
  5. Otsuki, N., Nagataki, S.,and Nakashita, K., 'Evaluation of ${AgNO_3}$ Solution Spray Method for Measurement of Chloride Penetration into Hardened Cementitious Matrix Materials,' ACI Materials Journal, Vol.89, No.6, 1992, pp.589-92
  6. Tang, L. and Nilsson, L.-O., 'Rapid Estimation of Chloride Diffusivity in Concrete by Applying an Electrical Field,' ACI Materials Journal, Jan-Feb. 1992, pp.49-53
  7. ASTM C 114, 'Standard Test Method for Chemical Analysis of Hydraulic Cement,' ASTM Committe COl, Annual Book of ASTM Standards, 2000, pp.18-20
  8. Arya, C., Buenfeld, N.R, and Newmann, J.B., 'Assessment of Simple Method to Determining fhe Free Chloride Content of Cement Pastes,' Cement and Concrete Research, Vol.17, 1987, pp.907-918 https://doi.org/10.1016/0008-8846(87)90079-2
  9. X. Lu, 'Relationship between the Free and Total Chloride Diffusity in Concrete,' Cement and Concrete Research, Vol.32, 2002, pp.323-326 https://doi.org/10.1016/S0008-8846(01)00664-0

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