Computers and Concrete

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Numerical technique for chloride ingress with cover concrete property and time effect

  • Lee, Bang Yeon (School of Architecture, Chonnam National University) ;
  • Ismail, Mohamed A. (Department of Civil and Construction Eng., Faculty of Engineering and Science, Curtin University Malaysia) ;
  • Kim, Hyeok-Jung (Elastomer TS&D Team, Kumho Petrochemical R & BD Center) ;
  • Yoo, Sung-Won (Department of Civil and Environmental Eng., Gachon University) ;
  • Kwon, Seung-Jun (Department of Civil and Environmental Eng., Hannam University)
  • Received : 2017.01.13
  • Accepted : 2017.04.11
  • Published : 2017.08.25
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Abstract

Durability problems initiated from steel corrosion are unseen but critical issues, so that many researches are focused on chloride penetration evaluation. Even if RC (Reinforced Concrete) structures are exposed to normal environment, chloride ingress varies with concrete surface conditions and exposed period. This paper presents an analysis technique for chloride behavior evaluation considering time effect on diffusion and surface conditions assumed as double-layered system. For evaluation of deteriorated surface condition, field investigation was performed for concrete pavement exposed to deicing agent for 18 years. In order to consider enhanced surface concrete, chloride profiles in surface-impregnated concretes exposed to chloride attack for 2 years from previous research were investigated. Through reverse analysis, effectively deteriorated/enhanced depth of surface and the related reduced/enlarged diffusion coefficient in the depth are simulated. The proposed analysis technique was evaluated to handle the chloride behavior more accurately considering changes of chloride ingress within surface layer and decreased diffusion coefficient with time. For the concrete surface exposed to deicing agent, the deteriorated depth and enlarged diffusion coefficient are evaluated to be 12.5~15.0 mm and 200% increasing diffusion coefficient, respectively. The results in concrete containing enhanced cover show 10.0~12.5 mm of impregnated depth and 85% reduction of chloride diffusion in tidal and submerged conditions.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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