Influence of cracks and spacers on chloride penetration and reinforcement corrosion in concrete
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This thesis studies the influence of cracks and spacers on chloride penetration and reinforcement corrosion in concrete. The study was conducted in connection with the Norwegian Public Road Authorities (NPRA) E39 project, wherein NTNU is collecting data regarding the extent of reinforcement corrosion in the vicinity of cracks in field exposed concrete structures. As such, the project was partially funded by the NPRA. The study is performed on parts of four concrete columns that NTNU had access to through DNV GL. The concrete specimens were originally the middle parts of larger columns at marine field station established by DNV GL in 1983, where they were exposed to the tidal zone for more than 30 years. At least up until 1992, the columns were dynamically loaded to simulate wave action. The columns were taken out of the water in 2016. Electrochemical potential measurements were performed on the specimens at NTNU in autumn 2016, and were repeated for this study. Chloride penetration was examined by the use of silver nitrate and µXRF scans on samples retrieved from the specimens. Patterns observed within the individual samples are documented, and comparisons are made between uncracked samples, cracked samples at samples containing spacers. The samples were later excavated, and the extent of corrosion in the rebars was visually assessed.