CN104863089A - Concrete crack electrolytic deposition repair system capable of realizing self-supply of electrolyte - Google Patents
Concrete crack electrolytic deposition repair system capable of realizing self-supply of electrolyte Download PDFInfo
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- CN104863089A CN104863089A CN201410062065.9A CN201410062065A CN104863089A CN 104863089 A CN104863089 A CN 104863089A CN 201410062065 A CN201410062065 A CN 201410062065A CN 104863089 A CN104863089 A CN 104863089A
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Abstract
The invention discloses a concrete crack electrolytic deposition repair system capable of realizing self-supply of electrolyte. The concrete crack electrolyte deposition repair system comprises a direct-current power supply, an anode made from metallic magnesium or zinc and a cathode, wherein reinforcing steel bars in a to-be-repaired concrete member serve as the cathode; the anode and the cathode are connected with the direct-current power supply through an anode lead and a cathode lead respectively; the current density calculated based on the steel area is 0.5-5 A/m2, and the power-on time lasts for 6-10 weeks; zinc ions or magnesium ions are ionized from the anode in the power-on process; hydroxyl is ionized from positions around the reinforcing steel bars serving as the cathode in the power-on process; the zinc ions or magnesium ions are combined with hydroxyl in cracks around, so that deposit sediment is generated to repair concrete cracks. The system is adopted for repair of the concrete cracks, no electrolyte needs to be added, the repair effect is good, and the system is applicable to repair of cracks of concrete members in different environments and especially applicable to repair of cracks of underwater concrete members in a fresh water environment or an onshore environment.
Description
Technical field
Patent of the present invention belongs to concrete structure repairing field, is specifically related to a kind of patch system occurring crack for the concrete component in fresh water environment, salt-fresh water environment and district waterborne concrete component.
Technical background
Concrete Structure Crack produces harmful effect to structure durability and safety, and crack repairing is an important step of old concrete structure maintenance.Crack repairing main method is grouting and polymer mortar patching now.But these methods all have some limitations, wherein because existing grouting equipment can not provide enough pressure, slurries can not fully be filled into crack root, and slip casting cannot reach full, closely knit, and therefore effect is not very desirable.Polymer mortar patching site operation comparatively bothers, and with regard to crack location fluting and need fill mortar, the later stage also needs to carry out maintenance to mortar, and construction condition and constructor's quality affect larger on its repairing quality.Major cracks recovery technique now has some limitations and defect.In this context, people work out electro-deposition repairing concrete crack technology.
From M.Yokoda, T.Fukute and H.Sasaki scholar proposes to answer the new technology of Means of Electrodeposition repairing concrete crack so far, electro-deposition techniques obtains research work and still mainly concentrates on desk research.Its research work mainly concentrates on choosing of electro-deposition electrolyte, and electrodeposition effect and electro-deposition are on the impact of concrete performance.As being select suitable electrolyte from 1998 ~ calendar year 2001 American scholar J.S.Ryu and Japanese scholars N.Otsuki, carry out electro-deposition test with the magnesium chloride of 0.1mol/L, zinc sulfate, silver nitrate, copper chloride, magnesium nitrate, copper sulphate, calcium hydroxide, sodium acid carbonate 8 kinds of solution respectively, result draws ZnSO
4that they propose to adopt crack self-healing rate and surface coverage to evaluate electrodeposition effect for the best electrolyte of electro-deposition repairing concrete crack effect (this result is identical with Hisada's with Banshoya in 1999).Calendar year 2001 J.S.Ryu and N.Otsuki adopts the reinforced concrete beam of 15cm × 15cm × 125cm to carry out electro-deposition test, result of the test shows the increase in time of crack self-healing rate and increases, the less healing rate in crack is faster, and the last fortnight healing is very fast, and during off-test, healing rate reaches 90%; Show that deposit is ZnO by X-ray diffraction analysis; The impermeability of test specimen can be improved after electrodeposition process, reduce the content of chlorion in test specimen.Within 2004, J.S.Ryu and P.Monteiro carries out laboratory test and field test respectively, and electrolyte is 0.1mol/LZnSO
4, current density is 0.5A/m
2direct current, test duration 14 days, test show that the adhesion strength of deposit and concrete body reaches 2.35MPa, this value is identical with the tensile strength of ordinary concrete, and the porosity through the test specimen of electrodeposition process obviously reduces; Outdoor test show that sedimentary deposit still can keep complete with the change of temperature and time, has certain durability.The Jiang Zhengwu of Tongji University of China is drawn by electro-deposition test, and current density is a key factor of distress in concrete healing effect.Current density is larger, Mg (OH)
2crystal sheet size is large, and thickness is thin, and arranges loose, will obtain structural arrangement on the contrary tight, the Mg (OH) that intensity is high
2foliaceous crystal.The electrode reaction that between electrode, electrical potential difference causes is the reason of electrochemical deposition, the mechanism of electrochemical deposition method to distress in concrete healing is: the product that cell reaction generates is induced nucleation and forms crystal in crack, thus realizes the filling healing of deposit in distress in concrete.
But at present electro-deposition mends a split technology all by means of interpolation magnesium salts or zinc salt as electrolyte, or utilize the salt in seawater as the electrolyte of electro-deposition system, as patent " repairing the electrochemical depositer of concrete structure crack " (ZL03231833.2), " a kind of device of repairing concrete crack by pulse electrodeposition " (ZL200820161863.7) and " device of electrochemical deposition method repairing concrete crack " (ZL200520076008.2).And do not need to add the electrolytical electro-deposition technology that mends a split and do not have patent or reported in literature temporarily, the field that electro-deposition is mended a split is limited, as the concrete component of inland river fresh water environment.
Summary of the invention
The object of the invention is to make up the deficiencies in the prior art, provide a kind of method from providing electrolytical electro-deposition mending concrete Fracture System, its construction is easier.
In order to reach foregoing invention object, present invention employs following technical scheme: a kind of from providing electrolytical electro-deposition mending concrete Fracture System, it anode comprising dc source, make with magnesium metal or zinc, and using the reinforcing bar in concrete component to be repaired as negative electrode, described anode and negative electrode are connected with dc source respectively by anode tap and cathode leg, and the current density calculated by the area of reinforcement is 0.5 ~ 5A/m
2conduction time is 6 ~ 10 weeks, and described anode ionizes out zinc ion or magnesium ion in galvanization, and negative electrode reinforcing bar ionizes out hydroxyl in galvanization around it, zinc ion or the hydroxyl of magnesium ion in neighbouring crack are combined, and generate deposit mending concrete crack.
Preferably, described conduction time is 7 weeks, and crack self-healing rate can up to 100%.
Preferably, current density is 1.5A/m
2.
Specifically, described anode is covered in concrete surface to be repaired, and described anode is bar-shaped, banded or tabular.
Preferably, described anode adopts cross section to be trapezoidal zinc band, and trapezoidal lower wide face is affixed on concrete surface to be repaired, and concrete surface to be repaired can arrange many zinc bands simultaneously.
Alternatively, described anode adopts bar-shaped magnesium anode, and bar-shaped magnesium anode is fixed on concrete surface to be repaired by flexible material.
Preferably, the output voltage of described dc source is 30V ~ 50V.
Specifically, described cathode leg is a cable of the reinforcing bar drawn in described concrete component to be repaired, and the extraction position of described cable and reinforcing bar is with mortar or epoxy resin sealing.
Adopt native system mending concrete crack, without the need to adding electrolyte, repairing effect is good, is applicable to the crack repairing of concrete component under varying environment, is particularly useful for fresh water environment or the repairing of underwater concrete structure member crevices under environment on the bank.Especially for the concrete structure in fresh water, the technology fracture that can directly adopt this patent to provide is repaired, and its construction is easier, and the scope of application is wider.
Accompanying drawing explanation
Fig. 1 is that the present invention adopts electro-deposition to mend a split in operation, repairs the elevation in square pile crack.
Fig. 2 is that the present invention adopts electro-deposition to mend a split in operation, repairs the lateral view in square pile crack.
Fig. 3 is the schematic diagram that the present invention adopts from providing electrolytical electro-deposition mending concrete Fracture System.
Wherein, crack 1 concrete square pile 2 anode 3 anode tap 4 cathode leg 5 rectifier 6 positive pole 7 negative pole 8
Detailed description of the invention
To repair inland terminal depot concrete square pile 2, illustrate from providing electrolytical electro-deposition mending concrete Fracture System.This concrete square pile inserts below the water surface and stands on mud face.
With reference to Fig. 1,2, provide elevation and the side view in mending concrete square pile crack respectively.Concrete square pile sectional dimension is 500mm × 500mm, and body structure surface has crack 1 and hole.
Electro-deposition mending concrete Fracture System of the present invention is set: negative electrode is the reinforcing bar in concrete component to be repaired.Reinforcing bar from concrete component to be repaired, draws a cable, as cathode leg 5, and is closed at cathode terminal position with the insulation materials such as mortar or epoxy resin.
Using magnesium or zinc anode as anode 3, anode tap 4 extends to positive pole 7, anode 3 is covered concrete component (being concrete square pile 2 in this example) surface.Anode 3 adopts cross section to be trapezoidal zinc band, and sectional dimension is upper wide 25.4mm, lower wide 31.25mm, high 30.5mm, and concrete surface to be repaired arranges 3 zinc bands altogether.
Anode tap 4 and cathode leg 5 are caused respectively positive pole 7 and the negative pole 8 of dc source (rectifier), rectifier carries the size that instrument can show electric current and voltage output.
The output current of adjustment dc source (rectifier), current density is 0.5 ~ 5A/m
2(calculating by the area of reinforcement), preferred 1.5A/m
2conduction time was 7 week, and the healing rate in crack reaches 100%.
The ac input end of dc source should install outside roof-cut resistence, its metal shell answer ground connection promptly resistance should be less than 4 Ω.The output voltage of dc source should control at below 50V, and reinforcing bar is by the negative pole of black wire connecting power, and anode is by the positive pole of red wire connecting power.
The present invention is equally also suitable for the reparation of district waterborne cracks in reinforced concrete, and repair system controls identical with technical data.
Claims (8)
1. from providing electrolytical electro-deposition mending concrete Fracture System, it is characterized in that: the anode comprise dc source, making with magnesium metal or zinc, and using the reinforcing bar in concrete component to be repaired as negative electrode, described anode and negative electrode are connected with dc source respectively by anode tap and cathode leg, and the current density calculated by the area of reinforcement is 0.5 ~ 5A/m
2conduction time is 6 ~ 10 weeks, and described anode ionizes out zinc ion or magnesium ion in galvanization, and negative electrode reinforcing bar ionizes out hydroxyl in galvanization around it, zinc ion or the hydroxyl of magnesium ion in neighbouring crack are combined, and generate deposit mending concrete crack.
2. according to claim 1 from providing electrolytical electro-deposition mending concrete Fracture System, it is characterized in that: it is characterized in that described conduction time is 7 weeks.
3. according to claim 1 from providing electrolytical electro-deposition mending concrete Fracture System, it is characterized in that: preferably current density is 1.5A/m
2.
4. according to claim 1 from providing electrolytical electro-deposition mending concrete Fracture System, it is characterized in that: described anode is covered in concrete surface to be repaired, described anode is bar-shaped, banded or tabular.
5. according to claim 4 from providing electrolytical electro-deposition mending concrete Fracture System, it is characterized in that: described anode adopts cross section to be trapezoidal zinc band, and trapezoidal lower wide face is affixed on concrete surface to be repaired, concrete surface to be repaired can arrange many zinc bands simultaneously.
6. according to claim 4 from providing electrolytical electro-deposition mending concrete Fracture System, it is characterized in that: described anode adopts bar-shaped magnesium anode, bar-shaped magnesium anode is fixed on concrete surface to be repaired by flexible material.
7. according to claim 1 from providing electrolytical electro-deposition mending concrete Fracture System, it is characterized in that: the output voltage of described dc source is 30V ~ 50V.
8. according to claim 1 from providing electrolytical electro-deposition mending concrete Fracture System, it is characterized in that: described cathode leg is a cable of the reinforcing bar drawn in described concrete component to be repaired, and the extraction position of described cable and reinforcing bar is with mortar or epoxy resin sealing.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107558753A (en) * | 2017-10-15 | 2018-01-09 | 吴腾飞 | A kind of decaying concrete electrochemical stabilization restorative procedure |
| CN110646594A (en) * | 2019-10-18 | 2020-01-03 | 无锡地铁集团有限公司 | Underground structure top crack indoor simulation device based on electrodeposition restoration |
| CN110965801A (en) * | 2019-11-29 | 2020-04-07 | 同济大学 | Underground concrete crack electrodeposition repair equipment and method |
| CN112982517A (en) * | 2021-02-04 | 2021-06-18 | 同济大学 | Three-electrode system for electrodeposition repair of water seepage crack of underground structure and repair method |
| CN113737231A (en) * | 2021-09-07 | 2021-12-03 | 河海大学 | Electrodeposition liquid for concrete microbial corrosion, preparation method and repair method |
| CN115536435A (en) * | 2022-10-14 | 2022-12-30 | 浙大宁波理工学院 | Bacteriostatic and antiseepage treatment method for reinforced concrete and its member |
| CN110646594B (en) * | 2019-10-18 | 2024-05-31 | 无锡地铁集团有限公司 | Underground structure top crack indoor simulation device based on electrodeposition restoration |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0665938A (en) * | 1992-08-19 | 1994-03-08 | Mitsui Eng & Shipbuild Co Ltd | Repairing method of reinforced concrete structure |
| CN101418595A (en) * | 2008-10-23 | 2009-04-29 | 河海大学 | Method and device for repairing concrete crack by pulse electrodeposition |
-
2014
- 2014-02-24 CN CN201410062065.9A patent/CN104863089B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0665938A (en) * | 1992-08-19 | 1994-03-08 | Mitsui Eng & Shipbuild Co Ltd | Repairing method of reinforced concrete structure |
| CN101418595A (en) * | 2008-10-23 | 2009-04-29 | 河海大学 | Method and device for repairing concrete crack by pulse electrodeposition |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107558753A (en) * | 2017-10-15 | 2018-01-09 | 吴腾飞 | A kind of decaying concrete electrochemical stabilization restorative procedure |
| CN110646594A (en) * | 2019-10-18 | 2020-01-03 | 无锡地铁集团有限公司 | Underground structure top crack indoor simulation device based on electrodeposition restoration |
| CN110646594B (en) * | 2019-10-18 | 2024-05-31 | 无锡地铁集团有限公司 | Underground structure top crack indoor simulation device based on electrodeposition restoration |
| CN110965801A (en) * | 2019-11-29 | 2020-04-07 | 同济大学 | Underground concrete crack electrodeposition repair equipment and method |
| CN110965801B (en) * | 2019-11-29 | 2021-10-08 | 同济大学 | Underground concrete crack electrodeposition repair equipment and method |
| CN112982517A (en) * | 2021-02-04 | 2021-06-18 | 同济大学 | Three-electrode system for electrodeposition repair of water seepage crack of underground structure and repair method |
| CN112982517B (en) * | 2021-02-04 | 2022-07-05 | 同济大学 | Three-electrode system for electrodeposition repair of water seepage crack of underground structure and repair method |
| CN113737231A (en) * | 2021-09-07 | 2021-12-03 | 河海大学 | Electrodeposition liquid for concrete microbial corrosion, preparation method and repair method |
| CN115536435A (en) * | 2022-10-14 | 2022-12-30 | 浙大宁波理工学院 | Bacteriostatic and antiseepage treatment method for reinforced concrete and its member |
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