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Effect of crack width on chloride ion corrosion of reinforcement in concrete

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Document pages: 11 pages

Abstract: When subjected to load or thermal shrinkage, reinforced concrete structures are usually in a cracked state, which increases the risk of reinforcement corrosion in the working environment. Through 654 days laboratory test on cracked reinforced concrete specimens exposed to chloride solution, the effect of protective layer cracking on chloride ion corrosion was studied. The size of the concrete sample is 100   mm × 100   mm × 400   mm and single precast crack in the middle of the span. When the percentage concentration of chloride ion (0.6 , 1.2 , 2.1 , 3.0 and 6.0 ) and crack width (uncracked, 0.2, 0.3, 0.4 and 0.5), the experimental results show that the corrosion rate of cracked samples increases with the increase of Chl concentrationride and increasing crack width. This study also showed the interrelationship between crack width and percentage concentration of chloride on the corrosion rate. In addition, an empirical model, incorporating the influence of the cover cracking and chloride concentration, was developed to predict the corrosion rate. This model allows the prediction of the maximum allowable based on the given percentage concentration of chloride in the exposure condition.

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