Damage model for simulating chloride concentration in reinforced concrete with internal cracks |
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| Affiliation: | 1. Department of Urban and Civil Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki, 316-8511, Japan;2. Department of Safety Systems Construction Engineering, Kagawa University, 2217-20, Hayashi, Takamatsu, Kagawa, 761-0396, Japan;3. Department of Civil and Environmental Engineering, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8552, Japan;1. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing, China;2. Department of Civil Engineering, Tsinghua University, Beijing, China;1. Higher Polytechnic School of Ávila, University of Salamanca (USAL), 50 Hornos Caleros Avenue, 05003 Ávila, Salamanca, Spain;2. School of Civil Engineering of Bauru, São Paulo State University (UNESP), 14-01 Eng. Luís Edmundo Carrijo Coube Avenue, 17033-360 Bauru, SP, Brazil;1. Division of Material and Computational Mechanics Chalmers University of Technology, S-41296 Gothenburg, Sweden;2. Division of Structural Engineering, Chalmers University of Technology, S-41296 Gothenburg, Sweden;1. School of Civil, Environmental & Architectural Engineering, Korea University, 5 Ga 1, An-Am Dong, Sung-Buk Gu, Seoul 136-701, Republic of Korea;2. College of Pipeline and Civil Engineering, China University of Petroleum (Huadong), No. 66 Changjiang West Road, Qingdao, Shandong Province, China;1. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China;2. Western China Earthquake and Hazards Mitigation Research Center, Sichuan University, Chengdu, Sichuan 610065, China |
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| Abstract: | We present a method to simulate, in three dimensions, the concentration of chloride ions that penetrate into concrete with internal cracks. The method comprises the crack-propagation analysis of concrete and the diffusion analysis of chloride ions. A finite-element model with a damage model that is based on fracture mechanics for concrete was applied in the crack-propagation analysis, and we were able to reproduce the three-dimensional geometry of the internal cracks. Chloride-ion transfer through internal cracks was simulated by diffusion analysis with the simultaneous consideration of damage, and a diffusion coefficient that was expressed as a function of the damage variable obtained from crack-propagation analysis. We present a formulation of crack-propagation analysis by using the damage model and unsteady-diffusion analysis in consideration of damage. We also present a verification analysis of internal cracking in concrete to demonstrate that the crack width and the chloride concentration can be evaluated without mesh dependency. This is followed by a validation analysis. A comparison between the numerical and experimental results shows that the proposed method enables the high-accuracy simulation of chloride penetration into concrete with internal cracks. |
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| Keywords: | Damage model FEM Reinforced concrete Internal crack Chloride ion |
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