Effect of fine crack width and water cement ratio of SHCC on chloride ingress and rebar corrosion |
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| Affiliation: | 1. Department of Civil Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan;2. Oriental Consultants, Japan;3. Formerly Master Course Student, Department of Civil Engineering, Gifu University, 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. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China;2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China;3. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing, 210098, China;4. Department of Civil and Environmental Engineering, University of Louisiana at Lafayette, United States;5. Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, MI, United States |
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| Abstract: | SHCC (Strain Hardening Cement-based Composite) is a material known for its strain-hardening behavior under tensile and bending stress and its characteristic numerous small cracks. SHCC is expected to show superior durability because of the fineness of the cracks. In this study, chloride ingress through cracks into SHCC and progress of rebar corrosion in three mixtures of SHCC with various water-cement ratios were investigated. Through a chloride solution immersion test, it was confirmed that chloride could penetrate through even very fine cracks. The resistivity of cracked SHCC against chloride ingress is mainly governed by the accumulated crack width and the water cement ratio. Chloride pre-mixed SHCC specimens were left in a high-temperature, high-humidity chamber for 11 months to promote rebar corrosion. While the accumulated crack width and the water cement ratio were both influential to an increase in corrosion area, only the water cement ratio had bearing on corrosion loss. |
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| Keywords: | SHCC Chloride attack Rebar corrosion Crack width |
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