Study On Chloride Ion Distribution In The Process Of Electrochemical Repair Of Concrete Structures

Chloride erosion is one of the main reasons for the early failure of reinforced concrete durability Electrochemical repair technology is a mainly for the chloride salt erosion of concrete structure of the durability of the upgrade technology.However,electrochemical repair technology to enhance the durability of the process of the existence of chloride ion space distribution of the unknown problem,This paper explores the characteristics of internal electric field distribution during the electrochemical repair of reinforced concrete structures by indoor experiment,and sets up multiple sets of experiments to optimize the parameters of the electrochemical repair process to improve the efficiency of chloride ion transport ion at the same time with more uniform precipitation of chloride ions,combining COMSOL Multiphysics numerical simulation equation to simulate the distribution of chloride ion in electron transport in reinforced concrete.And the actual construction application of Ningbo island building to enhance the durability.The main contents of this paper are as follows:A kind of embedded electrode array was developed to detect the electric field distribution around the reinforced concrete inside the reinforced concrete,and the internal electric field test of the reinforced concrete was carried out.The characteristics of electric field distribution in the specimen during the process of electromagnetism were determined by setting the parameters of simple reinforcement and complex steel bar,the maintenance period and the end of curing,the thickness of different protective layer,the different current density and the number of different capacitance.And compared with COMSOL Multiphysics numerical simulation software to simulate the distribution of electric field inside the concrete.The test results show that the distribution of the electric field during the 15 days of the test,the results show that the embedded electrode array is stable and the numerical simulation results are in good agreement with the indoor test,and the spatial distribution characteristics of the electric field in the process of energization are provedIn this paper,the electrochemical repair test of simple steel bar layout and complex steel bar specimen is carried out.The influence of different concrete age,different thickness of protective layer,different number of electric contacts and different current density parameters on the spatial distribution of chloride ion is set.The results showed that the chlorine removal efficiency of the test piece was lower than that of the curing period,and the chloride ion accumulation was found in the depth direction of the concrete surface,and the current was set at the end of the curing period.When the density increases from 1A / m2 to 5A / m2,the chloride ion accumulation in the depth direction of the concrete gradually disappears.When the thickness of the protective layer increases from 40 mm to 50 mm,the chlorine removal efficiency decreases gradually.Increased to four sides of the steel around the chloride ion out gradually become uniform.However,there is a non-uniform distribution of chloride ions in the area directly below the steel bar and in the middle area of the steel.In this paper,the cathodic electrode optimization test was carried out.The results show that the effect of uniform electromigration on chloride ion in different areas of the electrodeposition surface is greatly improved.