Accelerated test method for simulating non-uniform corrosion of steel bar in reinforced concrete by external electrode

Abstract

The invention discloses an accelerated test method for simulating non-uniform corrosion of a steel bar in concrete by an external electrode, which comprises the following steps: serving the concrete surface as a bottom surface on one side of a concrete sample away from the steel bar to be corroded; arranging a water tank of which the length is the same as that of the area to be corroded and the width is the same as that of the concrete sample at the periphery; sealing the periphery of the water tank and the concrete sample by using epoxy resin; arranging an external stainless steel mesh with the same length as an area to be corroded at the bottom of the water tank; and performing electroosmosis treatment, drying and watering cycle, and constant current power-on treatment on the concrete sample in turn. The accelerated test method can simulate the process of diffusing chloridions to the concrete under the chloride corrosion environment, realize non-uniform corrosion and single-side corrosion of the steel bar in the concrete, really reflect the process of developing a corrosion expansion crack in the corroded reinforced concrete structure, and is the accelerated test method for evaluating the performance of the corroded reinforced concrete structure.

Description

technical field [0001] The invention relates to a concrete structure durability test method, in particular to an external electrode accelerated simulation method for non-uniform corrosion of steel bars in reinforced concrete structures in a chloride-salt erosion environment. Background technique [0002] At present, the test methods used to study the performance of corroded reinforced concrete structures at home and abroad mainly include electrified accelerated corrosion methods, natural exposure test methods, component replacement methods, artificial climate environment methods, and artificial mechanical simulation methods. [0003] The method of accelerating corrosion by energizing is to use the steel bar to be corroded in the concrete as the anode, use stainless steel or copper as the cathode, and use concrete as the medium. In order to reduce the resistivity of the concrete, the concrete components are usually soaked in NaCl solution or the concrete is kept moist. Curren...

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Problems solved by technology

This method is simple to operate and easy to control, and can quantitatively analyze the influence of the corrosion rate of steel bars on the performance of components. The disadvantage is that only simple mechanical simulation cannot truly reflect the performance of complex actual reinforced concrete components after corrosion. The results obtained are the same as There is bound to be a certain gap in the actual corrosion situation

[0008] Although the performance of corroded reinforced concrete structures has been studied for a long time, there is still a lack of an accelerated corrosion test method with a short simulation period, low cost, and high similarity to the actual corrosion situation. How to more effectively simulate the actual chloride corrosion environment The non-uniform corrosion of steel bars in reinforced concrete structures has become a key issue in the study of the mechanical properties of existing reinforced concrete structures

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