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Device and method for repairing concrete structure damaged by salt through two-step process

A concrete structure and concrete technology, applied in the field of electrochemical repair, can solve the problem of low precipitation efficiency of harmful ions, and achieve the effects of improving migration ability, convenient operation and improving precipitation rate

Inactive Publication Date: 2012-08-08
浙大宁波理工学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the effect of removing chloride ions under the action of an electric field, but the removal efficiency of harmful ions in concrete is not high

Method used

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  • Device and method for repairing concrete structure damaged by salt through two-step process
  • Device and method for repairing concrete structure damaged by salt through two-step process
  • Device and method for repairing concrete structure damaged by salt through two-step process

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Experimental program
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Effect test

Embodiment 1

[0026] Such as figure 1 As shown, the device for repairing salt-injured concrete structures in two steps according to the present invention comprises a steel bar in the concrete (1) as a cathode (2), an electrolytic cell (3) in which the notch is sealed and matched with the surface of the concrete (1), and an electrolytic cell (3) located in the electrolytic The electrolyte (4) in the tank (3), the anode (5) immersed in the electrolyte (4), the DC power supply (6) for supplying power to the cathode (2) and the anode (5), and a pH indicator (7), The anode is a stainless steel mesh, the electrolytic cell (3) has an inlet (8) and an outlet (9) of the electrolyte (4), and the probe of the pH indicator (9) runs through the cell wall of the electrolytic cell (3) and is connected with the electrolytic cell (3). Liquid (4) contact, electrolytic cell (3) and concrete (1) surface contact position is provided with water-swelling water-stop bead (10), described water-stop bead (10) and co...

Embodiment 2

[0027] Embodiment 2 two-step method repairs the concrete structure of salt damage

[0028] The mass ratio of each component of the concrete structure is: cement: sand: gravel: water = 1: 1.40: 2.60: 0.49, that is, to configure a cubic meter of fresh concrete, use 210kg of water, 429kg of cement, 600kg of medium sand and 1115kg of particle size 5 ~ 16mm stones, among them, 2% of the cement mass, that is, 8.58kg of sodium chloride is added when the concrete is poured, the water-cement ratio is 0.5, the depth of the protective layer is 40mm, the standard maintenance is 28 days, and it is placed in the room for 5 months Finally, the electrochemical impedance spectrum and weak polarization curves of the steel bars in the concrete specimens before repair were measured with an electrochemical workstation Reference600, and it was found that the steel bars had been corroded. At the same time, along the depth direction of the concrete protective layer, drill holes to take powder, and us...

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Abstract

The invention discloses a device for repairing a concrete structure damaged by salt through two-step process, including a steel bar that acts as a cathode and is disposed in concrete, an electrolytic tank whose mouth is in seal seal fit with a surface of the concrete, electrolyte disposed in the electrolytic groove, an anode immersed in the electrolyte and a direct current power supply for providing power to the cathode and the anode, wherein the electrolytic groove is provided with an electrolyte inlet, an electrolyte outlet and a pH indicator, a probe of the pH indicator penetrating througha wall of the electrolytic groove and contacting with the electrolyte. The device provided in the invention is capable of timely replacement of electrolyte which is conducive to full discharge of chloride ions, and is capable of real-time monitoring of the ph value of the electrolyte, being applicable to concrete structures of various kinds of shapes; in addition, the device has the advantages ofsimple structure, convenient operation and effective removal of the chloride ions in a concrete protective layer with the removal efficiency achieving about 60%; further, the device can raise the corrosion potential of a corroded steel bar, decrease corrosion rate, realize the repassivation and maximumly repair a concrete structure damaged by salt.

Description

technical field [0001] The invention relates to the technical field of electrochemical restoration, in particular to a device and method for repairing salt-damaged concrete structures in two steps. Background technique [0002] It is a very serious problem whether the engineering life of concrete structures in harsh environments such as seawater and marine climates can meet the century-old requirements that people expect when designing. Reinforced concrete buildings in my country's coastal areas will generally be corroded and damaged to varying degrees about 10 years after they are built, which may even endanger the safety of the buildings. There are many reasons for the corrosion of concrete steel bars, and the intrusion of various chloride salts is the main culprit causing the corrosion of steel bars. Concrete salt pollution mainly refers to the presence of a large number of chlorides in concrete, which depassivates the steel bars in the concrete through chemical reaction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/00
Inventor 金伟良夏晋郭柱章思颖
Owner 浙大宁波理工学院
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