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Method for monitoring corrosion cracks of reinforced concrete and sensor

A reinforced concrete and sensor technology, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of inability to interpret the whole process of material cracking and cracking, and achieve good stability.

Inactive Publication Date: 2011-06-15
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method realizes distributed monitoring of rock mass deformation, but cannot intuitively interpret the whole process of material cracking and cracking from the perspective of material strain

Method used

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  • Method for monitoring corrosion cracks of reinforced concrete and sensor
  • Method for monitoring corrosion cracks of reinforced concrete and sensor
  • Method for monitoring corrosion cracks of reinforced concrete and sensor

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Embodiment Construction

[0039] To further illustrate the technical solution of the present invention, the following will be described in detail in conjunction with the accompanying drawings:

[0040] 1. Sensor production

[0041] In the process of structural concrete construction, the sensor of this embodiment is directly embedded in the concrete by binding with structural steel bars. Its structural features are as follows: figure 1 shown.

[0042] The sensor is a cylindrical concrete specimen 1 with a specific length, the radius of which is consistent with the thickness of the concrete protective layer 11 of the structure to be measured, and the simulated steel bars 15 and concrete materials thereof are consistent with the structure to be measured. The length of simulated steel bars 15 and stainless steel 16 inside the sensor is slightly shorter than the length of the sensor. Both ends are sealed with epoxy resin and then connected to wires, connected to the electrochemical workstation 17 to judge ...

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Abstract

The invention discloses a discloses a method for monitoring the corrosion cracks of reinforced concrete based on distributed optical fiber sensing technique. The method comprises the following steps: periodically detecting the polarization current of a steel bar and a stainless steel segment embedded in a sensor by an electrochemical work station to determine the initial corrosion time of the steel bar; monitoring the optical fiber strain by the distributed optical fiber sensing technique in real time through using sensing optical fibers surrounding the steel bar and laid in the sensor to deduce the corrosion expansion or corrosion crack stage of the reinforced concrete; and determining the corrosion expansion or corrosion crack degree by a calibration curve. The invention also discloses a sensor for executing the above method. The sensor can be used for monitoring the total corrosion cracking process of reinforced concrete at any position without damaging the structure of the concrete by monitoring the polarization current and the sensing optical fiber strain of the corroded steel bar, and can determine the corrosion crack stage and the degree of the reinforced concrete. The sensor is used for monitoring and evaluating the durability of reinforced concrete structure in the field of civil engineering.

Description

technical field [0001] The invention relates to the technical field of civil engineering health monitoring, in particular to a monitoring method and a sensor for the whole process of concrete rust swelling and cracking caused by steel bar corrosion. Background technique [0002] Corrosion of steel bars in reinforced concrete is one of the most important factors leading to structural durability failure. The premature failure of reinforced concrete structures caused by steel bar corrosion has become a major disaster that is generally concerned by countries all over the world. According to the survey results of my country's coastal bridges, wharves and industrial buildings, there is a common problem of "rebar corrosion" in coastal concrete structures and the situation is severe, which seriously affects the service life of the structures. Therefore, it is of great significance to accurately monitor the whole process of the initial rust of steel bars, concrete expansion cracking,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01B11/16G01B11/02
Inventor 何勇金伟良毛江鸿
Owner ZHEJIANG UNIV
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