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Advances in Concrete Construction Volume 12, Number 6, December 2021 , pages 517-525 DOI: https://doi.org/10.12989/acc.2021.12.6.517 |
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Probabilistic service life of box culvert due to carbonation of concrete cover |
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Sang-Kyun Woo, In-Yeop Chu, Yun Lee and Byung-Jae Lee
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| Abstract | ||
| More underground structures are increasingly being constructed such as box culverts for electric power transmission, and the life extension of these structures is very important. It is well known that the steel embedded in concrete is usually invulnerable to corrosion because the high alkalinity of the pore solution in concrete generates a thin protective oxide layer on the surface of the steel. Recent observations in the field and experimental evidence have shown that even steel in concrete can be corroded through the carbonation reaction of cover concrete. Carbonation-induced corrosion in concrete may often occur in a high carbon dioxide environment. In this study, the risk of carbonation of underground box culverts in Korea was evaluated by measuring the car¬bonation rate and concrete cover depth in the field. Then, the carbonation-free service life for the cover depth of the steel was calcu¬lated with in situ information and Monte Carlo simulation. Additionally, an accelerated carbonation test for a cracked beam specimen was performed, and the effect of a crack on the service life of a box culvert was numerically investigated with Monte Carlo simulation based on experimental results. | ||
| Key Words | ||
| box culvert; carbonation; cover depth; durability; Monte Carlo simulation; service life | ||
| Address | ||
| Sang-Kyun Woo: Transmission Laboratory, KEPCO Research Institute, 105 Munji-Ro, Yuseong-Gu, Daejeon, 34056, Republic of Korea In-Yeop Chu: Transmission Laboratory, KEPCO Research Institute, 105 Munji-Ro, Yuseong-Gu, Daejeon, 34056, Republic of Korea Yun Lee: Department of Civil Engineering, Daejeon University, 62, Daehak-ro, Dong-gu, Daejeon, 34520, Republic of Korea Byung-Jae Lee: Department of Civil Engineering, Daejeon University, 62, Daehak-ro, Dong-gu, Daejeon, 34520, Republic of Korea | ||
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