A strain-based method for steel corrosion monitoring

A steel bar corrosion and steel bar technology, which is applied in the field of steel bar corrosion monitoring, can solve the problems of being easily affected by environmental humidity, temperature, electromagnetic interference, inability to detect the degree of steel bar corrosion, low accuracy and reliability, etc., achieving low test cost, Precise positioning detection, ensuring safe and reliable results

Active Publication Date: 2022-01-18
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

The existing problems are: (1) It can only detect the overall corrosion degree of steel bars in a large area, but cannot detect the corrosion degree of steel bars in specific parts
(2) The detection is easily affected by environmental humidity, temperature, and electromagnetic interference, and its detection accuracy and reliability are low
(3) For each detection, it is necessary to temporarily dig a hole and bury electrodes for detection, which is troublesome to operate and high in detection cost

Method used

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  • A strain-based method for steel corrosion monitoring
  • A strain-based method for steel corrosion monitoring
  • A strain-based method for steel corrosion monitoring

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Embodiment

[0024] A specific embodiment of the present invention is a steel corrosion monitoring method based on strain, comprising the steps of:

[0025] A, a length of 5-20 times the length of the steel test optical fiber strain sensors 2, uniformly winding a laminated wrapping layer 3 is composed of two layers of nylon cloth elongated in the optical fiber strain sensor 2 and the leading end of the end leads each optical fiber at the same side wrapping layer 3 is exposed; 2 of the optical fiber strain sensors to a plurality of equally spaced grating strain sensors 2a optical fiber strain sensors; see figure 1 , 2 ;

[0026] B, with a wound optical fiber strain sensor wrap layer 3 against the package 2 to be tested on a reinforced steel cage; then using foam layer of sponge 4 is wound on the package in close contact layer 3, is embedded optical fiber strain obtained 2, the sensor reinforcement cage;

[0027] C, the optical fiber strain sensors are embedded reinforcement cage pouring templat...

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Abstract

A strain-based steel corrosion monitoring method, the main steps of which are: A, winding the optical fiber strain sensor in the wrapping layer; B, wrapping the wrapping layer on the steel bar to be tested in the steel cage; winding a layer of foam plastic sponge B, placing the reinforcement cage embedded with the optical fiber strain sensor in the pouring formwork, and then pouring concrete; C, connecting the optical fiber strain acquisition device with the optical fiber lead wire of the optical fiber strain sensor, and recording the initial data; then collecting the strain data regularly to obtain The corrosion degree of the corresponding part of the steel bar to be tested can complete the dynamic and positioning monitoring of the corrosion of the steel bar to be tested. The method can detect the degree of corrosion of steel bars with precise positioning, the detection results are accurate and reliable, the operation is simple and convenient, and the detection cost is low; it can provide more targeted, accurate and reliable monitoring for the design and maintenance, repair and demolition of reinforced concrete structures basis, so as to better ensure the safety and reliability of reinforced concrete structures.

Description

Technical field [0001] The present invention relates to a monitoring method of steel corrosion in reinforced concrete. Background technique [0002] Reinforced concrete structures are widely used in housing construction, hydraulic structures, offshore platforms and other projects. The effective cross-sectional area of ​​reinforced concrete structures occurs in a corrosive environment will rust in the steel is reduced so that the bond between the steel and concrete stress decreased rust expansion crack initiation and development, and the like, leading to failure of the reinforced concrete structure ; a serious impact on reliability and expected useful life of existing reinforced concrete structures. Steel corrosion in concrete is the cause of the durability of structural damage most prominent, will have a significant security risk, even causing huge economic losses, casualties and major adverse social impact. [0003] According to "China corrosion Survey Report" in October 2003 st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/2045G01B11/16
CPCG01N33/2045G01B11/165
Inventor 王士民王先明陈兵
Owner SOUTHWEST JIAOTONG UNIV
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