Electromagnetic field principle-based external nondestructive steel bar corrosion monitoring sensor and testing method

Abstract

The invention discloses an electromagnetic field principle-based steel bar corrosion monitoring sensor, which comprises a magnetic induction intensity monitoring unit and a data processing unit, wherein the magnetic induction intensity monitoring unit comprises a magnetic core, a coil, a packaging housing, hall sensors and a signal generator; and the data processing unit comprises a signal processor and a central processor. The invention further provides a testing method for the electromagnetic field principle-based steel bar corrosion monitoring sensor. The method comprises the steps of pretreating a to-be-tested specimen; measuring the magnetic induction intensity; carrying out calibration test; and calculating the steel bar corrosion rate according to a calibration fitting equation. According to the electromagnetic field principle-based steel bar corrosion monitoring sensor and the testing method, the defect of corrosion monitoring of steel bars built in concrete in a traditional testing method is overcome, the effects of changes in steel bar positions and bayonet sizes on steel bar corrosion monitoring are removed through symmetrically arranging the hall sensors and controllingthe electromagnetic field intensity, accurate monitoring of reinforced concrete corrosion is achieved, and the electromagnetic field principle-based steel bar corrosion monitoring sensor and the testing method are suitable for a mortar specimen and also suitable for a concrete specimen.

Description

technical field

[0001] The invention relates to steel bar corrosion monitoring technology in construction engineering, in particular to an external non-destructive monitoring sensor and testing method for steel bar corrosion based on the principle of electromagnetic field. Background technique

[0002] Reinforced concrete structure combines the tensile strength of steel bars and the compression resistance of concrete. Since it was applied in the field of civil engineering in the mid-19th century, it has become the most widely used structure in the world due to its low cost, wide selection of materials, and convenient construction. structure type. For a long time, the damage caused by the durability failure of concrete has been huge, which has far exceeded people's expectations and has become a worldwide problem. Among the causes of concrete durability failure, steel bar corrosion is the most serious, which has attracted widespread attention at home and abroad. In view of t...

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