Method for rapidly measuring reinforcing steel tarnishing criticality chlorine ion concentration

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...

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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. The current is detected, but the corrosion battery cannot be monitored in real time, and the corrosion battery cannot be continuously monitored

The electroosmotic test method has been widely used to test the diffusion coefficient of chloride ions in concrete. The electroosmotic voltage generally used is 30-60 volts. The disadvantage is that the applied voltage is too high, and it will be generated inside the concrete during the experiment. A certain amount of heat will affect the test results

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