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Electrolyte solution for electrochemical desalting of reinforced concrete

An electrolytic solution and reinforced concrete technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems of high price, inability to effectively prevent alkali-aggregate reaction, low desalination efficiency, etc. material reaction, improvement of concrete pore structure, high salt removal rate

Inactive Publication Date: 2006-09-27
成立
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AI Technical Summary

Problems solved by technology

However, when calcium hydroxide saturated solution is used as electrolyte solution, there are disadvantages such as low desalination efficiency (generally below 60%), and cannot effectively prevent alkali aggregate reaction, and when lithium tetraborate solution is selected, the price is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Preparation of electrolyte solution: first prepare calcium hydroxide saturated solution, then take 8.392g lithium hydroxide,

[0007] Boric acid 24.732g, add calcium hydroxide saturated solution to 10 liters. That is to prepare a calcium hydroxide saturated solution of 0.01mol / L lithium tetraborate solution.

[0008] The size of the reinforced concrete used in the test is 515mm×100mm×100mm, the mix ratio is water: cement: standard sand=0.55:1:3, and the amount of sodium chloride accounts for 3% of the cement mass. Four round steel bars with a diameter of 8 mm were buried in the specimen, and distilled water and analytically pure LiOH·H were used to prepare the electrolyte solution. 2 O, Ca(OH) 2 、H 3 BO 3 . According to the principle of electrochemical desalination, a set of laboratory electrochemical desalination device is designed. A layer of electrolyte solution holding material is preset on the concrete surface, and the metal mesh is wrapped on the surface of t...

Embodiment 2

[0016] Three electrolyte solutions were used in the test:

[0017] (1) distilled water (contrast);

[0018] (2)Ca(OH) 2 Saturated solution (control);

[0019] (3) Ca(OH) of 0.0010mol / L Li salt solution 2 saturated solution. Wherein, the Li salt solution is formed by mixing lithium hydroxide and boric acid at a ratio of 1:2 (ratio of the amount of substances). Specific preparation method: firstly prepare calcium hydroxide saturated solution, then take lithium hydroxide 0.8392g, boric acid 2.4732g, add calcium hydroxide saturated solution to 10 liters. That is, Ca(OH) prepared into 0.0010mol / L Li salt solution 2 saturated solution.

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Abstract

This invention discloses an electrolyte solution of removal salt from ferroconcrete with electrochemistry method, which comprises lithium hydrate, boric acid and calcium hydrate solution; the substantial weight ratio between lithium hydrate and boric acid is: lithium hydrate: boric acid=1: 1.5-2.5; after adding them into saturated calcium hydrate solution, the concentration of lithium tetraborate solution produced in reaction is theoretically 0.01-0.001mol / L. The invention comprises the following merits: the electrolyte solution is of high efficiency of removing salt, and can alkalinize reinforcement again, improve aperture framework of aperture, prevente reaction of base material, with low cost of removing salt.

Description

technical field [0001] The invention relates to the field of reinforced concrete protection, in particular to an electrolyte solution for electrochemical desalination of reinforced concrete. technical background [0002] Reinforcement corrosion, especially due to chloride pollution (from marine environment, deicing salt, chlorine-containing storage or industrial waste, etc.), has become the most prominent and common threat to the safety and durability of reinforced concrete structures. hazards. Electrochemical desalination is a technology for re-passivating the surface of steel bars by expelling chloride ions inside the concrete through an external power supply against chlorine salt erosion. At present, saturated calcium hydroxide solution and lithium tetraborate solution are used as electrolyte solution for electrochemical desalination of reinforced concrete. But when calcium hydroxide saturated solution is used as electrolytic solution, there is desalination efficiency l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/00
Inventor 成立余其俊黎能武
Owner 成立
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