Electrochemical rapid detection method for reinforcement corrosion degree in concrete structure

A technology for corrosion of concrete structures and steel bars, which is applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, scientific instruments, etc. It can solve the problems of not giving the quantitative relationship of corrosion detection results, unclear influence degree of corrosion detection results, and limitations Research and other issues, to achieve the effect of simple and easy measurement method, fast measurement process and accurate results

Inactive Publication Date: 2016-10-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0014] To sum up, the shortcomings of the half-cell potential method and the resistivity method in detecting the corrosion degree of concrete steel bars are: ① limited to qualitative research, and did not give a specific quantitative relationship between the corrosion detection results and the corrosion degree of steel bars; ② The degree of influence of external and internal factors such as ambient temperature and humidity, chloride ion concentration, mineral admixtures, and concrete cover thickness on the corrosion detection results is not yet clear

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  • Electrochemical rapid detection method for reinforcement corrosion degree in concrete structure
  • Electrochemical rapid detection method for reinforcement corrosion degree in concrete structure
  • Electrochemical rapid detection method for reinforcement corrosion degree in concrete structure

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Embodiment 1

[0062] Calculation example

[0063] A reinforced concrete bridge has been built and put into use for 10 years. The concrete strength grade of the box girder is C30, and the thickness of the protective layer is 45mm. The half-cell potential method and the concrete resistivity method are used to detect the corrosion of steel bars in the box girder. The measured ambient temperature is 26°C, humidity is 50%, chloride ion concentration is 0.1%, concrete resistivity is 5kΩ.cm, and the steel bar corrosion potential is -310mV.

[0064] First, it is judged that the temperature and humidity are both non-standard conditions, and the temperature and humidity correction of the potential and resistivity is carried out to obtain the steel corrosion potential and concrete resistivity under standard conditions. From Table 6, when the protective layer is 45mm, the temperature and humidity correction coefficients of concrete resistivity are -0.2353 and -17.9963 respectively, and the temperature...

Embodiment 2

[0072] (1) The old Longwang River Bridge in Ganyu County, Lianyungang City was completed in 1999, and two piers were selected for steel corrosion testing. The measured ambient temperature is 22°C, the humidity is 78%, and the thickness of the concrete protective layer is 60mm.

[0073] By looking up Table 6, using the interpolation method, the potential temperature and humidity correction coefficients are -2.60402, -248.761, and the resistivity temperature and humidity correction coefficients are -0.25456, -20.6701, respectively. The measured values ​​of potential and resistivity of No. 1 and No. 2 piers, the corrected values, and the evaluation of steel corrosion rate are shown in Table 7 to Table 10.

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Abstract

The electrochemical rapid detection method for the corrosion degree of steel bars in concrete structures under different conditions provided by the present invention adopts the combination of half-cell detection, resistivity detection and environmental factors, forms a half-cell by soaking the concrete surface with a conductive solution, and combines the environmental temperature , environmental humidity, fly ash content, chloride ion content and the thickness of the protective layer, the corrosion potential of the steel bar at the measuring point and the resistivity of the concrete are obtained by the look-up table method or the interpolation calculation method to determine whether the steel bar is corroded and the corrosion rate, and the determination process is fast ; Determination method is simple and easy; integrated two electrochemical detection methods, the result is more accurate.

Description

technical field [0001] The invention relates to the technical field of evaluating concrete steel bars, in particular to an electrochemical rapid detection method for the corrosion degree of steel bars in concrete structures under different conditions. Background technique [0002] Corrosion of reinforcement in concrete, especially in different external environments such as marine environment, chloride pollution, etc., can lead to premature and accelerated failure of concrete structures. Therefore, if we can timely and accurately detect the initial corrosion state of steel bars and predict the development trend of steel bar corrosion, and take corresponding reinforcement measures, not only can avoid major safety accidents, but also can greatly reduce the cost of concrete structure maintenance. [0003] At present, the commonly used non-destructive detection methods of steel corrosion degree include analytical method, physical method and electrochemical method. Since the corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02
CPCG01N17/02G01N17/006
Inventor 吴瑾邹正浩汪中杨桂新
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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