Accelerated test method of non-uniform corrosion in inbuilt electrode simulation concrete

Abstract

The invention discloses an accelerated test method of non-uniform corrosion in inbuilt electrode simulation concrete. After a concrete test piece is prepared by precating stainless steel sheets in concrete, the concrete test piece is successively performed with electroosmosis treatment, drying and watering cycle and constant-current energization treatment. Under the action of an electric field, chlorid ions accelerate to move into a concrete structure, and reinforcing steel bars in concrete reach the corrosion threshold value in advance so as to simulate the process that chlorid ions enter the concrete structure in the engineering environment. The drying and watering cycle process and little corrosion current speed up to corrode the reinforcing steel bars in the concrete structure, and the developing process of practical corrosion-induced expansive cracks is simulated. The method of the invention can simulate the diffusion process of chlorid ions to concrete in the chloride corrosion environment to realize the non-uniform corrosion and the single-surface corrosion of reinforcing steel bars in concrete, truly reflects the developing process of corrosion-induced expansive cracks in a reinforced concrete structure, and provides an accelerated test method for accessing the corroded property of the reinforced concrete structure.

Description

technical field [0001] The invention relates to a concrete structure durability test method, in particular to a method for accelerating the non-uniform corrosion of steel bars in reinforced concrete structures in simulated chloride corrosion environments. 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. Current intensity and ener...

AI Technical Summary

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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