Test method and test device for simulating natural non-uniform corrosion of steel bars in concrete

Abstract

The invention discloses a test method and a test device for simulating natural inhomogeneous rusting of a reinforcing steel bar in concrete. The method comprises the following steps: pre-burying stainless steel wires in concrete, and supplying constant-current power for electrolytic reaction to a concrete test piece. The test device comprises a mold unit, a stressing unit, a test piece to be tested and a power supply unit, wherein the mold unit comprises a mold for casting the test piece to be tested, a through hole bolt and a fastening bolt; the stressing unit comprises a bracket, a lower fulcrum, an upper fulcrum, a loading screw rod and a popping bolt; the test piece to be tested comprises a concrete base body, a reinforcing steel bar and a stainless steel wire electrode; the power supply unit adopts a voltage-stabilizing current-stabilizing direct-current power supply. The test method and the test device have the benefits that the test period is short, natural inhomogeneous rusting of the reinforcing steel bar can be effectively simulated, the position, the rusting range and the rusting degree of inhomogeneous rusting in the circumference direction, and inhomogeneous rusting in the length direction of the reinforcing steel bar can be effectively controlled, energy loss caused by concrete resistance can be reduced, and the prediction result precision is high.

Description

technical field [0001] The invention relates to a test method and a test device for simulating the natural non-uniform corrosion of steel bars in concrete. Background technique [0002] Due to the advantages of concrete structure in terms of materials, cost and maintenance, it has always occupied a dominant position in civil engineering, and has been widely used in major civil engineering (large-scale construction projects, bridge engineering, hydraulic engineering and port engineering). For concrete structures in marine environment and deicing salt environment, steel corrosion is the main factor affecting the durability of concrete structures. The economic losses caused by the durability of concrete structures have brought huge economic losses to both developed countries and developing countries, and have attracted widespread attention at home and abroad. A large number of achievements have emerged in the research on the corrosion of steel bars and the cracking of concrete...

AI Technical Summary

Problems solved by technology

Although this method can achieve non-uniform corrosion of steel bars to a certain extent, it cannot cause non-uniform corrosion along the circumferential direction of steel bars and non-uniform corrosion along the length of steel bars, and it cannot cause rust to occur on the side facing the concrete protective layer. Does not truly reflect the natural corrosion due to the corrosion form caused by the transfer of chloride ions, oxygen and moisture to the steel surface

And according to the electrochemical theory, the farther the distance between the electrode and the steel bar is, the greater the resistance of the concrete will be, resulting in a greater thermal effect, which leads to the inaccurate prediction of the amount of steel bar corrosion by Faraday's law.

Images