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Title |
Probabilistic Durability Design of RC Structures Exposed to Sulfate Attack Using Natural Diffusion Coefficient Tests
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Authors |
방자호(Ja-Ho Bang) ; 최지완(Ji-Woan Choi) ; 권성준(Seung-Jun Kwon) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.4.427 |
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Keywords |
원전 구조물; 내구설계; 내구수명; 피복두께; 황산염 확산계수 NPP structure; durability design; service life; cover depth; sulfate diffusion coefficient |
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Abstract |
Service life is evaluated differently depending on the quantification of environmental deterioration, resistance mechanisms, and design methods. In this study, the service life of precast (PC) box structures in nuclear power plant structures constructed in the UAE was assessed with respect to sulfate attack. Concrete samples were prepared based on the obtained mixing materials, and the mean and coefficient of variation (COV) of the sulfate ion diffusion were determined through natural diffusion tests. Service life was evaluated through deterministic and probabilistic methods based on Monte Carlo simulation (MCS) and the linear degradation depth method, respectively, and the influence of various design parameters on the predicted service life was analyzed and discussed. Owing to design variables such as the environmental load factor, durability acceleration factor, and marginal erosion depth for safety, the deterministic design method was found to be slightly conservatively; however, no significant differences were observed. When the external sulfate concentration exceeded 200 ppm and the COV of aluminum oxide content was high, the results showed considerable variation, highlighting the importance of sufficient cover depth and stringent material quality control. Furthermore, it is necessary to quantify the variability of design parameters for the target structure (such as cover depth, external sulfate concentration, and diffusion coefficient) to enable a more accurate and reliable prediction of service life.
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