On-line corrosion detector for reinforced concrete and method thereof

Abstract

The invention provides an on-line corrosion detector for reinforced concrete based on a disk electrode. The on-line detector comprises a polarization circuit (2) and a current constraint circuit (3), wherein the disk electrode (1) comprises reference electrodes RE1, RE2 and RE3, an auxiliary electrode CE (13) and a circular ring electrode GE (17); the polarization circuit (2) polarizes the reinforcing steel bars in concrete through the auxiliary electrode CE (13) and the reference electrode RE1 in the disk electrode (1); and meanwhile the current constraint circuit (3) restrains polarization current through the circular ring electrode GE (17) and potential difference between the reference electrodes RE2 and the reference electrodes RE3 so as to limit the polarization current in a projection zone of the auxiliary electrode CE (13). The invention further provides a method for measuring corrosion rate of the reinforcing steel bar in a concrete structure by using the detector. The invention improves measurement accuracy of the corrosion rate of the reinforcing steel bars in the concrete structure and avoids measurement errors caused by current over-constraint and under-constraint.

Description

technical field [0001] The invention relates to the field of on-line corrosion detection of reinforced concrete, in particular to an on-line corrosion detector for reinforced concrete based on self-adaptive current constraints, which is a portable corrosion detector that directly measures the corrosion state of steel bars in the concrete structure without destroying the concrete structure. It is suitable for corrosion investigation of built concrete projects, online evaluation of rust inhibitor efficiency and cathodic protection effect. Background technique [0002] The health status of reinforced concrete is directly related to the safety and durability of large-scale building structures such as bridges, docks, and highways. Therefore, on-line monitoring of the corrosion status of steel bars has become a very important engineering problem. Early failure of concrete structures is caused by Cl - It is caused by ion intrusion and concrete carbonation, while steel corrosion is...

AI Technical Summary

Problems solved by technology

[0004]The key to the corrosion detection of concrete reinforcement is to determine the polarization area of ​​the reinforcement as the working electrode, because all the reinforcement in the engineering structure are interconnected by the reinforcement, forming a It is difficult to determine the polarization area of ​​steel bars in actual engineering

In this regard, someone proposed the guard ring electrode method (Guard Ring electrode method, GRM) to constrain the polarization current of the auxiliary electrode, so that the polarization area is limited to a specific range, but this technology is based on complete current constraints and is not based on concrete Resistivity and steel corrosion state are adaptively adjusted, resulting in frequent over-constraint or under-constraint of current in field tests

U.S. Patent 5,259,944 is a patent on corrosion monitoring of grommet electrodes. Its internal circuit adopts full compensation mode, and does not automatically adjust the current constraints of grommet electrodes according to different concrete systems. The results measured during supervision have large deviations and are far from the true value

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