Abstract
Cracking has been a severe threat to the durability of reinforced concrete structures. Electrochemical deposition is a promising rehabilitating method for crack repair with the additional advantages of chloride removal and realkalization of embedded rebars. This work presents a comprehensive numerical study of three coupled subprocesses involved in the electrochemical deposition treatment: concrete cracking, multi-ionic transport and crack repair, which can reveal the underlying mechanisms from a fundamental point of view. A multi-phase cracking model was developed considering local mechanical property variances in concrete composites. Interconnections and chemical reactions among various ions in concrete composites were elaborated thoroughly. Unlike most existing studies, the overall improvement of impermeability and compactness of structural components was well reflected by considering porosity changes and corresponding time-dependent ionic diffusivities. A detailed parametric analysis on influencing factors revealed that the current density of 0.5 A/m2 possesses the best repair effect with a complete closure in 15 days, but the chloride removal efficiency is not ideal. Increasing the ambient temperature can promote the crack repair rate, and the most obvious improvement is between 0 ℃ and 10 ℃. The findings could provide the basis for optimal selection during electrochemical deposition treatment.
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