Steel bar corrosion evaluation method based on magnetic field principle

Abstract

The invention relates to a steel bar corrosion evaluation method based on a magnetic field principle, which comprises the following steps: arranging a reference steel bar, testing the magnetic induction intensity of the steel bar by using an external sensor on the basis of not damaging the stability of a concrete structure, and monitoring a reinforced concrete test piece. The corrosion conditions of the reinforcing steel bars under different protective layer thicknesses are obtained according to monitoring results and theoretical basis analysis, the magnetic induction intensity of the test piece before corrosion is set to be B0I, the magnetic induction intensity of the test piece after corrosion is set to be B0II, the corrosion rate of the reinforcing steel bars is set to be PII, the calculation formula is PI = alpha (B0II-B0I), and alpha is a linear relation coefficient. The method is an evaluation method which does not influence the stability of a concrete structure and accurately tracks and tests steel bar corrosion at different protective layer thicknesses in a concrete sample for a long time on the basis of a magnetic field principle, the efficiency of a steel bar corrosion test in a laboratory can be greatly improved, and smooth research is helped.

Description

technical field [0001] The invention relates to a steel bar corrosion evaluation method in a reinforced concrete test. In particular, it relates to evaluating the corrosion of steel bars with a sensor based on the principle of using a magnetic field. Background technique [0002] As the most widely used building material today, concrete is widely used in the field of civil engineering. Deterioration of reinforced concrete structures due to steel corrosion is a major consideration in concrete design, construction and maintenance. Corrosion of steel bars will produce rust swelling force on concrete, which will lead to cracking of concrete and reduce the service performance of concrete structure. 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. [0003] Therefore, long-term monitoring of the steel bars after th...

AI Technical Summary

Problems solved by technology

Each test needs to destroy a sample, and a complete test needs to destroy multiple samples of the same type. Due to the differences between samples, the test results are very discrete, and it is impossible to carry out long-term follow-up analysis on the samples.

In the stage of non-destructive testing, the macro current test method of the anode ladder sensor has become an important detection method in the detection of steel corrosion. The corrosion of steel bars with different protective layer thickness can be detected by using the anode ladder sensor. However, the current anode ladder is subject to The influence of ambient humidity is great, and the installation process of the anode ladder is complicated, and the insulation life is short

In addition, the spacing between the six steel anodes of the anode ladder sensor is fixed, and there are defects in synchronous and real-time monitoring of steel corrosion at different protective layer thicknesses

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