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A method of electroosmotic substitution pore solution for repairing chloride corrosion of concrete structures

A technology of concrete structure and pore solution, applied in the field of concrete, can solve the problems of restricting application, increasing the risk of alkali-aggregate reaction, reducing the bond strength of steel/concrete interface, etc., and achieves the effect of low cost, wide application range and simple process

Inactive Publication Date: 2016-03-16
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electrochemical desalination also has some defects, such as reducing the bond strength of the steel / concrete interface, increasing the risk of alkali-aggregate reaction, softening the steel / concrete interface mortar, and causing hydrogen embrittlement, which seriously restrict the application of this method in engineering.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of electrolyte:

[0023] Anolyte: a mixed solution of 0.03mol / L sodium dodecylbenzenesulfonate and 0.1mol / L NaOH;

[0024] Catholyte: deionized water;

[0025] (2) Soak the reinforced concrete structure sample in the electrolyte for 10 days, so that the reinforced concrete structure sample reaches a saturated state;

[0026] (3) Place the saturated reinforced concrete structure sample in the electrolytic cell, divide the electrolytic cell into an anode pool and a cathode pool, and place a titanium mesh plate with a purity of 98% in the anode pool and the cathode pool as the anode and cathode respectively ; Inject electrolyte into the anode pool, and inject deionized water into the cathode pool;

[0027] (4) Ground the steel bar in the reinforced concrete structure for protection, the anode and the cathode are respectively connected to the positive and negative electrodes of the external power supply, and at 20°C, apply an applied voltage of 12V between...

Embodiment 2

[0030] (1) Preparation of electrolyte:

[0031] Anolyte: 0.05mol / L sodium dodecylbenzenesulfonate, saturated Ca(OH) 2 mixed solution;

[0032] Catholyte: deionized water;

[0033] (2) Soak the reinforced concrete structure sample in the electrolyte for 3 days, so that the reinforced concrete structure sample reaches a saturated state;

[0034] (3) Place the saturated reinforced concrete structure sample in the electrolytic cell, divide the electrolytic cell into an anode pool and a cathode pool, and place a titanium mesh plate with a purity of 98% in the anode pool and the cathode pool as the anode and cathode respectively ; Inject electrolyte into the anode pool, and inject deionized water into the cathode pool;

[0035] (4) Ground the steel bars in the reinforced concrete structure for protection, and connect the anode and cathode to the positive and negative electrodes of the external power supply respectively. At 15°C, apply an applied voltage of 6V between the anode an...

Embodiment 3

[0038] (1) Preparation of electrolyte:

[0039] Anolyte: 0.01mol / L sodium dodecylbenzenesulfonate, 0.6mol / LKOH, 0.2mol / LNaOH and 0.001mol / LCa(OH) 2 mixed solution;

[0040] Catholyte: deionized water;

[0041] (2) Soak the reinforced concrete structure sample in the electrolyte for 14 days, so that the reinforced concrete structure sample reaches a saturated state;

[0042] (3) Place the saturated reinforced concrete structure sample in the electrolytic cell, divide the electrolytic cell into an anode pool and a cathode pool, and place a titanium mesh plate with a purity of 98% in the anode pool and the cathode pool as the anode and cathode respectively ; Inject electrolyte into the anode pool, and inject deionized water into the cathode pool;

[0043] (4) Ground the steel bars in the reinforced concrete structure for protection, and connect the anode and cathode to the positive and negative electrodes of the external power supply respectively. At 30°C, apply an applied vol...

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PUM

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Abstract

The invention provides an electro-osmotic pore solution replacement method for repairing chloride corrosion in concrete structures. The method includes the steps of mixing well anionic surfactant and alkali pore solution to obtain electrolyte; soaking a reinforced concrete structure sample in the electrolyte to saturate the sample; placing the saturated reinforced concrete structure sample in an electrolytic cell, dividing the electrolytic cell into anodic cell and a cathodic cell, and placing an anode and a cathode in the anodic cell and the cathodic cell respectively at the same time; pouring electrolyte into the anodic cell and pouring deionized water into the cathodic cell; subjecting rears in the reinforced concrete structure sample to ground protection, externally connecting the anode and the cathode to positive and negative electrodes of a power source respectively, applying external voltage 1-6V / cm (relative to concrete width between the anode and the cathode) between the anode and the cathode to perform electro-osmotic pore solution replacement for 7-28 days at the temperature of 0-50 DEG C. The electro-osmotic pore solution replacement method for repairing chloride corrosion in concrete structures is simple in process, low in cost, capable of lossless repairing, and widely applicable.

Description

technical field [0001] The invention belongs to the technical field of concrete, and specifically relates to a method for repairing chlorine salt corrosion of concrete structures by electroosmosis driving away the pore solution polluted by chloride ions, promoting the external pure pore solution to enter the concrete pores, thereby removing chloride ions, and promoting the restoration of steel bars to a passive state method. Background technique [0002] Reinforced concrete structure combines many advantages of steel bar and concrete, and the cost is low. It is the preferred form in the design of civil engineering structures and is widely used. However, the reinforced concrete structure in the chloride-salt environment (such as marine environment, salt lake and saline-alkali land, and road ice salt) is extremely vulnerable to the intrusion of chloride ions, which induces corrosion and damage to the steel bars, thereby shortening the service life of the reinforced concrete. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G23/02
Inventor 徐金霞单鸿猷高国福蒋林华赵梦琼庞大鹏
Owner HOHAI UNIV
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