Bidirectional electroosmosis repairing method of corrosive concrete structure

A concrete structure and repair method technology, applied in the field of electrochemical repair, can solve the problem of low efficiency of harmful ion precipitation, achieve the effect of improving migration ability, convenient operation, and reducing corrosion rate

Inactive Publication Date: 2012-09-05
GUANGSHA CONSTR GROUP +1
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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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  • Bidirectional electroosmosis repairing method of corrosive concrete structure
  • Bidirectional electroosmosis repairing method of corrosive concrete structure
  • Bidirectional electroosmosis repairing method of corrosive concrete structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The mass ratio of each component in concrete is: cement: sand: gravel: water = 1: 1.40: 2.60: 0.49, that is, to prepare a cubic meter of fresh concrete, use 210kg of water, 429kg of cement, 600kg of medium sand, and 1115kg of particle size 5 ~ 18mm stones, mix 2% of the cement mass that is 8.58kg of sodium chloride during concrete casting, the water-cement ratio is 0.5, the depth of the protective layer is 40mm, the standard maintenance is 28 days, and after 5 months in the normal room , using the electrochemical workstation Reference600 to measure the electrochemical impedance spectrum and weak polarization curves of the steel bars in the concrete specimens before repair, and found that the steel bars have been corroded, and the data of the initial corrosion potential of the steel bars are shown in Table 1. At the same time, the chlorine ion content in the concrete specimen was measured by the rapid chloride ion test method (RCT). The initial test data are shown in Tabl...

Embodiment 2

[0025] The mass ratio of each component in concrete is: cement: sand: gravel: water = 1: 1.40: 2.60: 0.49, that is, to prepare a cubic meter of fresh concrete, use 210kg of water, 429kg of cement, 600kg of medium sand, and 1115kg of particle size 5 ~ 18mm stones, mix 2% of the cement mass that is 8.58kg of sodium chloride during concrete casting, the water-cement ratio is 0.5, the depth of the protective layer is 40mm, the standard maintenance is 28 days, and after 5 months in the normal room , using the electrochemical workstation Reference600 to measure the electrochemical impedance spectrum and weak polarization curves of the steel bars in the concrete specimens before repair, and found that the steel bars have been corroded, and the data of the initial corrosion potential of the steel bars are shown in Table 1. At the same time, the chlorine ion content in the concrete specimen was measured by the rapid chloride ion test method (RCT). The initial test data are shown in Tabl...

Embodiment 3

[0029] The mass ratio of each component in concrete is: cement: sand: gravel: water = 1: 1.40: 2.60: 0.49, that is, to prepare a cubic meter of fresh concrete, use 210kg of water, 429kg of cement, 600kg of medium sand, and 1115kg of particle size 5 ~ 18mm stones, mix 2% of the cement mass that is 8.58kg of sodium chloride during concrete casting, the water-cement ratio is 0.5, the depth of the protective layer is 40mm, the standard maintenance is 28 days, and after 5 months in the normal room , using the electrochemical workstation Reference600 to measure the electrochemical impedance spectrum and weak polarization curves of the steel bars in the concrete specimens before repair, and found that the steel bars have been corroded, and the data of the initial corrosion potential of the steel bars are shown in Table 1. At the same time, the chlorine ion content in the concrete specimen was measured by the rapid chloride ion test method (RCT). The initial test data are shown in Tabl...

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Abstract

The invention discloses a bidirectional electroosmosis repairing method of a corrosive concrete structure. The method comprises the following steps of: injecting a corrosion inhibitor into electrolyte; with the steel bar in the concrete as a cathode, paving a stainless steel net on the concrete surface as an anode; immersing the anode into the electrolyte containing the corrosion inhibitor; applying DC (direct current) power between the anode and cathode, and controlling the applied current density to be 1-5A/m<2> based on the total surface area of the steel bar; and cutting off the power 10-20 days later. The method disclosed by the invention is convenient to operate, improves the moving ability of the cationic corrosion inhibitor, and can enable the corrosion inhibitor to enter the steel bar surface through electroosmosis in relatively short time; through the invention, the chloride ions in a concrete protection layer can be effectively removed, and the precipitation rate of chloride ions is high; and moreover, the corrosion potential of the corroded steel bar is increased, the corrosion rate is reduced, re-passivation is realized, the salt-damaged concrete structure is repaired to the greatest degree, and the service life of the structure is prolonged according to the expected requirements.

Description

technical field [0001] The invention relates to the technical field of electrochemical repair, in particular to a two-way electroosmotic repair method for corroded concrete structures. Background technique [0002] It is a very serious problem whether the engineering life of concrete structures in harsh corrosive environments such as seawater and marine climates can meet the one-hundred-year requirements that people expect when designing. Reinforced concrete buildings in my country's coastal areas generally have different degrees of corrosion damage about 10 years after they are built, and even endanger the safety of buildings in serious cases. Improving the durability of concrete structures is the key to solving this problem. However, due to improper design, use or maintenance, a large number of coastal concrete structures have durability problems to varying degrees. Due to the lack of durability of concrete structures, huge economic losses will be caused every year. How t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G23/02
CPCE04C5/015C23F2201/02
Inventor 金伟良夏晋章思颖郭柱卢振华周剑刚
Owner GUANGSHA CONSTR GROUP
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