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Computers and Concrete Volume 20, Number 2, August 2017 , pages 185-196 DOI: https://doi.org/10.12989/cac.2017.20.2.185 |
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Numerical technique for chloride ingress with cover concrete property and time effect |
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Bang Yeon Lee, Mohamed A. Ismail, Hyeok-Jung Kim,
Sung-Won Yoo and Seung-Jun Kwon
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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. | ||
| Key Words | ||
| diffusion; durability; double-layer; deicing agent; chloride attack; surface impregnation | ||
| Address | ||
| Bang Yeon Lee: School of Architecture, Chonnam National University, 77 Yongbong-no, Buk-gu, Gwangju, 61186, Republic of Korea Mohamed A. Ismail: Department of Civil and Construction Eng., Faculty of Engineering and Science, Curtin University Malaysia, CDT 250, 98009 Miri, Sarawak, Malaysia Hyeok-Jung Kim: Elastomer TS&D Team, Kumho Petrochemical R & BD Center, 15577 Yuseong-daero, Yuseong-gu, Daejeon, 34044, Republic of Korea Sung-Won Yoo: Department of Civil and Environmental Eng., Gachon University, 1342 Seongnam Daero, Seongnam-Si 13120, Republic of Korea Seung-Jun Kwon: Department of Civil and Environmental Eng., Hannam University, 133 Ojeong-dong, Daejeon, 34430, Republic of Korea | ||