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Device and method for monitoring corrosion condition of steel in steel plate concrete

A technology of steel plate concrete and monitoring device, which is used in measurement devices, weather resistance/light resistance/corrosion resistance, and analysis of materials, etc., can solve the problems of steel plate concrete damage, inability to accurately judge steel corrosion, critical concentration differences, etc.

Pending Publication Date: 2021-05-14
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current method of analyzing the concentration of chloride ions in the concrete protective layer after drilling the core will cause damage to the steel plate concrete on the one hand, and on the other hand, there are differences in the critical concentration of chloride ions that cause corrosion of steel bars, and it is impossible to accurately determine whether the steel bars are about to corrode.

Method used

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  • Device and method for monitoring corrosion condition of steel in steel plate concrete
  • Device and method for monitoring corrosion condition of steel in steel plate concrete
  • Device and method for monitoring corrosion condition of steel in steel plate concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The present invention can be used to monitor the corrosion situation of the steel plate in the steel plate concrete, and the arrangement method of the device is as follows figure 1 , 2 shown. To implement, first follow the Image 6 Electrode (2) was fabricated as shown. The cathode (12) of electrode (2) is made of stainless steel, and the top has screw holes; the anode (13) is the same steel material as the steel plate to be tested, and the upper part is tapped; the cathode and anode must be cleaned with acetone earlier during production, Then fix a wire (1) on the inner side of the opening of the cathode (12) with bolts and nuts, and fix the other wire (1) on the anode (13) with bolts to seal the flat surface of the cathode and anode and then pour the Fill it with epoxy resin (14) and fill it tightly. After the epoxy resin is completely dry, polish the flat surface of the cathode and anode, and number the electrodes at the end of the wire, and the electrode producti...

Embodiment 2

[0031] The present invention can also be used for monitoring the corrosion situation of steel bar in steel plate concrete, as image 3 , 4 As shown, the difference from Example 1 is that when engineering plastics (3) are installed, two fixed steel sheets (9) need to be welded on the steel plate in advance, and the steel sheets have opposite bolt holes (11), and engineering plastics ( 3) Holes are also drilled at corresponding positions; the distance between the steel sheets is slightly greater than the width of the engineering plastic (3). After the engineering plastics are inserted between the two fixed steel sheets, the engineering plastics (3) are fixed on the fixed steel sheets (9) with the through bolts and nuts. It should be noted that when the fixed steel sheet (9) is set, the distance between the bolt holes (11) should be large enough to prevent the support rigidity of the engineering plastics (3) from being fixed and rotate. Other steps are identical with embodiment...

Embodiment 3

[0033] The present invention can also be used for monitoring the intrusion situation of chloride ion in concrete in steel plate concrete, as Figure 5 shown. The difference from Example 1 is that the working surface of the electrode (2) is arranged parallel to the main concrete surface where chloride ions invade; adjust the relative position of the electrode (2) engineering plastics, starting from the surface of the concrete not greater than 5mm with a certain Several electrodes (2) are arranged in a depth gradient, and other steps are the same as in Embodiment 1. When the electrode potential difference and macro cell corrosion current suddenly increase at a certain depth during monitoring, it indicates that the concentration of chloride ions at this depth has reached the concentration that can corrode steel bars, and then more electrodes will have the above situation as time goes by. In this way the intrusion of chloride ions in concrete can be monitored over time.

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Abstract

The invention discloses a device and method for monitoring the corrosion condition of steel in steel plate concrete. An electrode support is arranged on a steel plate (5) of the steel plate concrete; the support comprises a steel cushion block (4) welded on the steel plate (5) and engineering plastic (3) fixed on the steel cushion block (4); a row of fixing grooves are formed in the engineering plastic (3); the fixing grooves are used for fixing electrodes (2) for monitoring; threaded holes (7) are formed in the side faces of the fixing grooves; and the electrodes (2) are fixed in the fixing grooves through bolts and the threaded holes (7); the distances between the working surfaces of the electrodes (2) and the steel plate (5) are not more than 5mm; and leads (1) are led out from the other ends of the electrodes (2) and are connected with a measuring instrument. The device and method are simple to operate; and corrosion conditions of steel plates and steel bars are monitored and found as soon as possible, so that harm and loss can be reduced to the greatest extent.

Description

technical field [0001] The invention belongs to the technical field of corrosion monitoring, in particular to the technical field of steel corrosion monitoring in steel plate concrete members in a chlorine-containing environment. Background technique [0002] The corrosion of steel bars and steel plates in steel plate concrete is one of the most important factors restricting the durability of steel plate concrete structures. Among the corrosion of many steel plates and steel bars, the corrosion of steel bars and steel plates caused by the intrusion of chloride ions is the most influential and destructive. [0003] Since the concentration of chloride ions in concrete itself is low, the reason for the corrosion of steel bars and steel plates is mostly the intrusion of external chloride ions and accumulation on steel bars and steel plates, and corrosion occurs after reaching a certain concentration. [0004] Compared with spending a lot of money on repairs after corrosion occu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02G01N27/30
CPCG01N17/02G01N27/30
Inventor 储艳春李成左绍兵徐良严军张立力
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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