Method for rapidly measuring reinforcing steel tarnishing criticality chlorine ion concentration

A technology of chloride ion concentration and steel corrosion, applied in the direction of electrochemical variables of materials, etc., can solve the problems of real-time monitoring of non-corroding batteries, high voltage, long test time, etc., and achieve the effect of reducing the time for critical concentration determination.

Inactive Publication Date: 2008-07-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the dry-wet cycle method is usually used to measure the critical chloride ion concentration of steel bar corrosion. Continuous monitoring of corroded cells
The electroosmotic test method has been widely used to test the diffusion coefficient ...

Method used

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  • Method for rapidly measuring reinforcing steel tarnishing criticality chlorine ion concentration
  • Method for rapidly measuring reinforcing steel tarnishing criticality chlorine ion concentration
  • Method for rapidly measuring reinforcing steel tarnishing criticality chlorine ion concentration

Examples

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Embodiment 1

[0022] In a certain test, the mass of concrete powder obtained by sampling the concrete on the surface of the electrode was 6.9g, and the concentration of silver nitrate used was C AgNO3 =0.01mol / l, the cement content C%=17.58% in the concrete, and the volume relationship between the potential measured during titration and the consumed silver nitrate solution and its first-order and second-order derivatives are shown in the following table:

[0023] V AgNO3

Potential difference E / mV

ΔE / ΔV(mV / ml)

ΔE 2 / ΔV 2 (mV / ml 2 )

0.0

211.0

2.0

221.0

5

4.0

248.4

13.7

4.35

5.5

281.8

22.3

5.73

6.0

289.3

15.0

-14.6

8.0

312.5

11.6

-1.7

10.0

321.6

4.5

-14.2

[0024] Use the interpolation method to calculate the corresponding second-order differential quotient ΔE 2 / ΔV 2 is zero when V...

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Abstract

The invention discloses a method for quickly measuring steel bar corrosion critical chloride ion density, belonging to steel corrosion detection technique. The method comprises arranging prepared a concrete sample with a non-immersion reference electrode and an immersion working electrode into an electro-osmosis tank, adding 3-20V direct-current voltages at two sides of the concrete sample, detecting the current of the macro battery composed of the immersion working electrode and the non-immersion reference electrode, if the macro battery current reaches the value of corrosion germination, stopping the electro-osmosis test, or else, continuing and repeating the processes as adding voltage, stopping powering and macro battery current detection until the macro battery current reaches the value of corrosion germination, stopping the electro-osmosis test. And after the electro-osmosis test, the invention uses potential titration to test chloride ion density in concrete. The inventive method can significantly reduce critical chloride ion density test time and realize automatic test control via detecting macro battery current.

Description

technical field [0001] The invention belongs to the field of steel corrosion degree detection methods, more specifically, the invention relates to a method for quickly measuring the critical chloride ion concentration of steel bar corrosion. Background technique [0002] As an engineering structural material, reinforced concrete is widely used in construction projects such as roads, bridges, and ports in chloride-salt corrosion environments. Corrosion of steel bars caused by chloride ions has widely caused damage to concrete structures, seriously affecting or even endangering the safety of buildings, bridges and other buildings. It has become an urgent task to use various high-performance concrete to improve the protection level of steel bars in concrete and to repair and repair the structure where corrosion occurs. At present, the general survey on the safety hazards of concrete bridges has been carried out in an all-round way in our country, and the standards and specific...

Claims

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Application Information

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IPC IPC(8): G01N27/44
Inventor 徐永模耿春雷翁端
Owner TSINGHUA UNIV
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