Steel bar corrosion monitoring method

Abstract

The invention belongs to a steel bar corrosion monitoring technical field, and relates to a steel bar corrosion monitoring method, which comprises the following steps of using an change of a resistance value of a built-in steel wire to reflect the corrosion condition of the steel bar, which is mainly used for corrosion monitoring and durability assessment of the steel bar component in a steel bar concrete structure, and is achieved in a parallel-resistance-typed steel bar corrosion monitoring device. The process procedure comprises two steps of mounting of parallel-resistance-typed steel bar corrosion monitoring device and monitoring of steel bar corrosion condition, wherein the steel wire is embedded in different depth from the concrete surface by using a parallel-connection manner, and is led out only using a group of wires uniform sections or variable cross-sections, thereby ensuring sensibility of the change in resistance of a metal conductor caused by corrosion of the steel bar. The inclining degree of the parallel-resistance-typed steel bar corrosion monitoring device can be adjusted so as to monitor the corrosion condition of the steel bar in different concrete protective layer thicknesses. The principle thereof is scientific and reliable, monitoring is easy and convenient, the monitoring result is accurate and reliable, and the resistance signal is simple and sensitive to change, thereby being easy to analyze and monitor, so that the adaptive range is wide.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of steel bar corrosion monitoring, and specifically relates to a steel bar corrosion monitoring method, which uses the change of the built-in steel wire resistance value of a parallel resistance type steel bar corrosion monitoring device to reflect the steel bar corrosion status, and is mainly used for the corrosion monitoring of steel bar parts in reinforced concrete structures and durability rating. [0003] Background technique: [0004] In reinforced concrete structures, the corrosion of steel bars is one of the important factors affecting the safety and durability of construction engineering structures; when steel bars are corroded, the volume expands, the bond between steel bars and concrete decreases, and the concrete protective layer peels off. In turn, the strength of the building structure is reduced, and the steel bar corrosion occurs inside the building structure, which is difficult to det...

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Problems solved by technology

[0004] In reinforced concrete structures, the corrosion of steel bars is one of the important factors affecting the safety and durability of construction engineering structures; when steel bars are corroded, the volume expands, the bond between steel bars and concrete decreases, and the concrete protective layer peels off. In turn, the strength of the building structure is reduced, and the steel bar corrosion occurs inside the building structure, which is difficult to detect with the naked eye. When repairing a slightly damaged building caused by steel bar corrosion, there are problems of heavy workload, high cost and poor benefit. The problem is that when the damage of the building is serious, it will bring immeasurable losses to people's lives and property safety; therefore, it is necessary to monitor the corrosion state of the steel bars in the concrete and grasp the internal conditions of the building structure, so that Early warning before damage occurs to minimize losses

In the late 1980s, the Institute of Civil Engineering of RWTH Aachen University in Germany invented the trapezoidal anode concrete structure embedded non-destructive testing sensor system, which is widely used in steel corrosion monitoring, but it has the disadvantages of high cost, complex structure and special measuring instruments. Problem; At present, the monitoring of steel bar corrosion is realized by measuring some electrochemical parameters of steel bars in concrete structures by sensors: a kind of steel bar corrosion time prediction device disclosed in Chinese patent 201120123530. Bracket, screw and fixing rod, the steel wire is wound on the PVC rod and leads to the side groove of the bracket, and the two ends of the steel wire are connected with wires, and the side groove of the bracket is provided with an epoxy resin filling layer, which is used to fix the wire and PVC rod, the screw is set at one end of the bracket, and it passes through the stainless steel fixing rod, its function is to adjust the distance between the fixing rod and the bracket, each group of steel wires has a set of external wires, the number of external wires is large, and the structure of the junction box is complex ; Chinese patent ZL201210471244.9 discloses a steel bar corrosion monitoring device and method in a concrete structure. The device includes a fiber grating strain sensor, a signal processing unit, a stainless steel inclined plane support, at least three fiber grating strain sensors and wires, and the fiber grating strain sensor is sequentially Arranged on the slope of the inclined plane support, the signals collected by each fiber grating strain sensor are sent to the signal processing unit through the wire, and the fiber grating strain sensor is used to measure the tensile strain caused by the rust swelling force generated by the corrosion product of the steel bar at different thicknesses of the concrete protective layer through the fiber grating strain sensor and the time of strain generation, deduce the corrosion rate of steel bars and the initial corrosion time of steel bars in reinforced concrete structures, which are used to indirectly monitor the corrosion of steel bars. The integrity of the device is not protected during the pouring of concrete. Disadvantages such as non-adjustable height and small application range

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