Sulfate ingress simulation in concrete considering repairing and temperature condition
Keun-Hyeok Yang,Seung-Jun Kwon,Hyeon-Woo Lee,Ahmed K. Alkaabi,Gyeong-Hee An,Ji-Won Hwang
Abstract
In the high exterior temperature, the cracking possibility due to hydration heat and drying shrinkage also increases, and the ion penetration and the related corrosion increase since the ions move rapidly. In this study, the sulfate diffusion behavior with increasing temperature was evaluated and its activation energy was derived for evaluating the deterioration behavior in the NPP (Nuclear Power Plant) concrete for sulfate ion ingress. After obtaining the materials used in the NPP, concrete samples were prepared, and the temperature-dependent sulfate diffusion coefficients were obtained while elevating the temperature from 20oC to 50oC with 10oC interval. During the process of temperature elevating, the diffusion coefficient increased to a level of 3.4 times, and the activation energy range was measured to 19.4-28.9 KJ/mol with average of 22.3 KJ/mol, which had no significant differences from the those of chloride diffusion results. Finally, the sulfate ion ingress behavior was simulated considering effect of temperature, repairing thickness, and cover depth, which showed a significant sulfate intrusion due to elevated temperature.
Key Words
activation energy; diffusion; NPP; repairing; sulfate ion; temperature effect
Address
Keun-Hyeok Yang — Department of Architectural Engineering, Kyonggi University, Suwon 16227, Republic of Korea
Seung-Jun Kwon — Department of Civil and Environmental Engineering, Hannam University, Daejeon 34430, Republic of Korea
Hyeon-Woo Lee — Department of Civil and Environmental Engineering, Hannam University, Daejeon 34430, Republic of Korea
Ahmed K. Alkaabi — Emirates Nuclear Technology Center & Department of Mechanical and Nuclear Engineering, Khalifa, UAE; University of Science and Technology, Abu Dhabi 127788, UAE
Gyeong-Hee An — Structural and Seismic Safety Research Division, Korea Atomic Energy Research Institute, Daejeon 34142, Republic of Korea
Ji-Won Hwang — Department of Architectural Engineering, Kyonggi University, Suwon 16227, Republic of Korea
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