CN103205759A - Control-free reinforced concrete structure cathode protection method and device - Google Patents
Control-free reinforced concrete structure cathode protection method and device Download PDFInfo
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- CN103205759A CN103205759A CN2013101314020A CN201310131402A CN103205759A CN 103205759 A CN103205759 A CN 103205759A CN 2013101314020 A CN2013101314020 A CN 2013101314020A CN 201310131402 A CN201310131402 A CN 201310131402A CN 103205759 A CN103205759 A CN 103205759A
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Abstract
The invention discloses control-free reinforced concrete structure cathode protection method and a device. The device comprises a rebar, a carbon fiber reinforced plastic (CFRP) sheet, and a direct current power supply, wherein the rebar is implanted into concrete; the CFRP sheet is used as an auxiliary anode material of current; the direct current power supply supplies electricity to the device; and a binding material for connecting the CFRP sheet and the concrete is arranged between the CFRP sheet and the concrete. The CFRP sheet is adopted as an auxiliary electrode of the protection device, and constant power supply of enough current or voltage is output to remove a control system and an inspection system in the traditional device. Therefore, the cost can be greatly reduced when an ideal protection effect is obtained.
Description
Technical field
The present invention relates to the impressed current cathodic protection field, relate in particular to a kind of skeleton construction guard method and device that need not to control.
Background technology
Skeleton construction is topmost structure formation in the civil engineering work, along with the increase of working life and the variation of environment for use, the deterioration of skeleton construction and disabler are comparatively general and serious, have caused the concern of scientific research scholar to the concrete structure durability problem.Concrete weather resistance refers to that concrete resists the effect of various destructive factors under actual service conditions, keeps the ability of intensity and outward appearance integrity for a long time.
From the angle of materialogy, the main reason of reinforced concrete structure durability deterioration is the corrosion of inner reinforcing bar.Under the normal circumstances, reinforcing bar is about in 13 the inside concrete hole solution at pH value can form passive film.But when the concrete that passes porous when the external corrosion medium entered into rebar surface, passive film was destroyed and is lost protection to reinforcing bar, thereby caused the corrosion of reinforcing bar.
At present, impressed current cathodic protection technology has been proved to be one of effective means.The impressed current cathodic protection technology is based on that PH-potential ph diagram ph principle puts forward, and thinks the reinforcing bar current potential to be dropped on exempt from the erosion district by apply cathodic current to reinforcing bar, and then reaches the purpose of protection reinforcing bar.Supplementary anode is the important component part of impressed current cathodic protection system, has played cathodic current is passed to concrete effect from external circuit.The process of delivered current is to discharge electronics by the electrochemical reaction that supplementary anode surface takes place to finish, and this requires, and supplementary anode must possess that polarization is little, current drainage big, difficult consumption and the characteristics of long term operation stable performance etc.Up to now, scientific research scholar's research and developed various supplementary anodes, as the ferrosilicon anode, metallize layer anode, baried type anode and mixed metal oxide titanium anode etc.Wherein at present effect ideal what be most widely used is mixed metal oxide titanium anode, but its expensive price has limited its promotion and application greatly.
In addition, a complete skeleton construction impressed current cathodic protection system is mainly by reinforcing bar, supplementary anode, and direct supply detection system and Controlling System are formed.Therefore wherein, the prime cost of system is distributed on supplementary anode and the Controlling System, wants the cost of control cathode protection, can develop in the configuration of suitable supplementary anode or the system of improvement and start with.Wherein, suitable supplementary anode can be that the supplementary anode of main body is realized by research and development CFRP.
As the most common carbon fibre reinforced composite in structural strengthening field (CFRP) because having advantages such as high-strength light, modulus are big, good corrosion resistance, become a kind of structural strengthening material of maturation.In fact, CFRP is except the mechanical property that people know, because one of its main component that contains-carbon fiber has good electrochemical properties, i.e. and good electrical conductivity and near the electropotential of precious metal, CFRP has good electrochemical properties equally.Therefore, the applicant utilizes the electrochemical properties of CFRP to form the impressed current cathodic protection method that a kind of novel supplementary anode is applied to skeleton construction.
After structure is applied impressed current cathodic protection, need the etch state of reinforcing bar is detected according to traditional thinking, measure the electrochemical parameter of reinforcing bar, as polarized potential, corrosion electric current density etc., and feed back to Controlling System.When the electrochemical parameter of reaction reinforcement corrosion state did not meet the demands, Controlling System can be regulated voltage or the electric current output of direct supply, and reinforcing bar all is subjected to enough protections in guaranteeing structure.This has determined traditional impressed current cathodic protection to need expensive cost, and daily maintenance and operation expense.
Therefore, prior art remains to be further developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art; the object of the present invention is to provide a kind of skeleton construction guard method and device that need not to control; be intended to solve in the prior art carry out skeleton construction when carrying out impressed current cathodic protection because the cathodic protection system cost is expensive limited deficiency on causing using; a kind of skeleton construction impressed current cathodic protection method and device that need not to control electrochemical parameter is provided; in the ideal effect that reaches the protection concrete structure, reduced cost.
Technical scheme of the present invention is as follows:
A kind of skeleton construction cathode protecting process that need not to control wherein, may further comprise the steps:
A, remove in the protection zone loose concrete, and in concrete, occur inserting the matrix material with conducting function in the zone in crack;
B, in concrete the CFRP sheet material of implantation current auxiliary anode material, and with spacing of reinforcement setting in this CFRP sheet material and the concrete;
C, matrix material is covered on the described CFRP sheet surface of a corresponding side with reinforcing bar, and the matrix material that firmly pressurizes, make itself and CFRP sheet material and concrete binding together;
D, the positive pole of CFRP sheet material with a direct current power supply is connected, described reinforcing bar is connected with the negative pole of described direct supply; Described reinforcing bar links to each other by described concrete electric with described matrix material, and forms a loop line with described CFRP sheet material and described direct supply.
The described skeleton construction cathode protecting process that need not to control, wherein, described step B also comprises: be electrically connected between the reinforcing bar that needs are protected, and the electrical connectivity between the test reinforcing bar.
The described skeleton construction cathode protecting process that need not to control, wherein, described matrix material is cement paste or the epoxy resin glue that has added conductive particle.
A kind of skeleton construction cathodic protector that need not to control, wherein, this device comprises:
Be used for being installed in the reinforcing bar in the concrete;
Be used for being installed in the concrete and as the CFRP sheet material of electric current auxiliary anode material,
And one carry out direct current power source supplying power for described device;
Described CFRP sheet material is by concrete and described spacing of reinforcement setting;
The CFRP sheet material is connected with the positive pole of described direct supply, and described reinforcing bar is connected with the negative pole of described direct supply; And a side corresponding with described reinforcing bar is provided with the matrix material with conducting function on described CFRP sheet material; Described reinforcing bar links to each other with described matrix material by described concrete with described CFRP sheet material, and forms a loop line with described direct supply.
The described skeleton construction cathodic protector that need not to control, wherein, the number of steel bars in the described concrete is at least 1, when the reinforcing bar number greater than 1 the time, be electrically connected between the reinforcing bar, and detect electrical connectivity between the reinforcing bar.
The described skeleton construction cathodic protector that need not to control, wherein, described matrix material is cement paste or the epoxy resin glue that has added conductive particle.
Beneficial effect: the invention provides a kind of skeleton construction cathode protecting process and device that need not to control; described device adopts CFRP sheet material as supplementary anode; and export the stabilized power source of enough curtages and saved Controlling System and the check system in the conventional apparatus; not only can obtain desirable protection effect; effectively improve durability of structures, and controlled the cost of skeleton construction galvanic protection greatly.
Description of drawings
Fig. 1 is a kind of skeleton construction cathode protecting process that need not to control of the present invention and device most preferred embodiment flow chart of steps.
Fig. 2 is concrete Application Example one structural representation of a kind of skeleton construction cathodic protector that need not to control of the present invention.
Fig. 3 is the concrete Application Example one cross-sectional structure synoptic diagram of a kind of skeleton construction cathodic protector that need not to control of the present invention.
Embodiment
The invention provides a kind of skeleton construction cathode protecting process and device that need not to control, clearer, clear and definite for making purpose of the present invention, technical scheme and effect, below the present invention is described in more detail.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
As described in Figure 1, the invention provides a kind of skeleton construction cathode protecting process that need not to control, wherein, this method may further comprise the steps:
S1, remove in the protection zone loose concrete, and in concrete, occur inserting the matrix material with conducting function in the zone in crack.
Loop in order to ensure last installation can be good at carrying out the transmission of cathodic protection current; therefore before installing; need remove concrete loose in the protection zone earlier; the matrix material that can conduct electricity is inserted in the zone that the crack concrete occurred; make it to become continuous ionogen; so not only guaranteed the smooth circulation of loop current, and matrix material itself has very strong hardness, can well increase the steadiness of described current protective device.
S2, in concrete, implant the CFRP sheet material of impressed current auxiliary anode material, and with spacing of reinforcement setting in this CFRP sheet material and the concrete.
Discover that the carbon fibre reinforced composite (CFRP) that is widely used in the structural strengthening field at present not only possesses the good mechanical performance; and it is good as the electric conduction of carbon fiber of main component; electropotential is near the electrochemical properties of precious metal; and described CFRP sheet material has electric action; be used for transmitting the cathodic current that this concrete structure is protected; CFRP also has corrosion-resistant advantage, has good resistibility for the electrochemical reaction product that produces on its surface.
Because the CFRP pattern is flexible; there is the cloth material that sheet material is also arranged; it can present different section forms; different shapes, different sites applicable to structure; in order to guarantee to transmit cathodic protection current uniformly as the CFRP of electric current auxiliary anode material; what can expect is; when specific embodiment, can use CFRP sheet material and CFRP cloth; this the best implements to select to use the CFRP sheet material; and the CFRP material normally is tiled in the structural region that needs protection as supplementary anode; its area coverage is big, for the positive effect of being evenly distributed with of protective current.
In this step matrix material is covered on the surface of CFRP sheet material and the corresponding side of described reinforcing bar, be convenient to by concrete the cathodic current on the reinforcing bar is delivered on the CFRP sheet material.
S3, matrix material is covered on the described CFRP sheet surface of a corresponding side with reinforcing bar, and the matrix material that firmly pressurizes, make itself and CFRP sheet material and concrete binding together;
Bad for fear of contacting with the CFRP sheet surface because of matrix material, cause cathodic current can better not transmit smoothly or uniformly, therefore matrix material need be pressurizeed makes its thickness even.
S4, reinforcing bar and CFRP sheet material are linked to each other with anodal with the negative pole of direct supply respectively, described reinforcing bar, concrete, CFRP sheet material and direct supply are formed the series loop of closure.
Reinforcing bar is connected with the negative pole of direct supply, and the CFRP sheet material is connected with the positive pole of direct supply.Because reinforcing bar links to each other with the matrix material of CFRP sheet material by concrete and conduction, therefore described reinforcing bar, concrete, CFRP sheet material and direct supply are formed closed series loop.
In concrete the application, described matrix material need satisfy and has conductivity and the high characteristic of intensity own, CFRP firmly can be fixed on concrete surface, for example be the inorganic coagulation material of representative or the epoxy resin glue that has added conductive particles such as powdered graphite with the cement paste.Preferably, use cement paste as matrix material in the present invention, it is even glutinous mutually with the CFRP sheet surface, not only self has very high intensity, it with CFRP sheet material and concrete binding together, can improve the stability of whole concrete structure, thickness the best of described matrix material is about 3mm.
Described concrete is continuous ionogen, if the crack then should in time use cement paste to fill up, thereby cathodic protection current can be well transmitted in the complete loop of guaranteeing reinforcing bar-concrete-cement paste-CFRP sheet material composition.
Also comprise among the above-mentioned steps S4: be electrically connected between the reinforcing bar that needs are protected, and the electrical connectivity between the test reinforcing bar.
The method of impressed current cathodic protection provided by the invention because adopt CFRP as supplementary anode, is used for reference the construction technology of CFRP ruggedized construction, with matrix material CFRP is bonded in concrete surface, need not main equipment, has the easy-to-install benefit.
In addition, as shown in Figure 2, the present invention also provides a kind of skeleton construction cathodic protector that need not to control, and as described in Figure 2, this device is by forming with the lower section:
The reinforcing bar 4 that described device is protected in advance, imbed described reinforcing bar concrete 3, be used for carrying out direct current power source supplying power 5 as the CFRP sheet material 1, of electric current auxiliary anode material for described device; Be provided with for the matrix material 2 that both are linked together between described CFRP sheet material 1 and the described concrete 3.
Reinforcing bar 4 is implanted in the concrete 3, and device provided by the invention is used for it is protected.Be provided with a CFRP sheet material 1 in the concrete middle and upper part, described CFRP sheet material 1 surface is adhesive with matrix material 2, described matrix material 2 itself has enough intensity, and it links to each other CFRP sheet material 1 with concrete 3, can strengthen the integrally-built intensity of described device.
Described reinforcing bar 4 links to each other with anodal with the negative pole of a direct current power supply 5 respectively with described CFRP sheet material 1, and this direct supply 5 provides described protector required electric current.
Because described reinforcing bar is connected by described matrix material 2 with described CFRP sheet material 1, reinforcing bar 4 is connected with described direct supply 5 with described CFRP sheet material 1, and therefore last described reinforcing bar 4, described concrete 3, described matrix material 2 and described CFRP sheet material 1 and described direct supply 5 form a closed series loop and form a complete closed series loop.
What can expect is that the skeleton construction that the present invention is directed to is not limited only to rectangular beam structure as shown in Figure 2, also can be used for the various skeleton construction shapes that the protection needs are arranged, as concrete circular post etc.
Employed matrix material 2 is cement paste in above-mentioned specific embodiment of the present invention.
A kind of skeleton construction cathodic protector that need not to control provided by the invention, this device comprise the reinforcing bar of protecting in advance, the concrete of imbedding described reinforcing bar, are used for carrying out direct current power source supplying power as the CFRP sheet material, of electric current auxiliary anode material for described device; Be provided with for the matrix material that both are linked together between described CFRP sheet material and the described concrete; This device is owing to adopt the CFRP sheet material as the supplementary anode of protector; can when obtaining desirable protection effect, greatly reduce cost; and because the matrix material itself that uses has intensity preferably; it is connected with concrete with the CFRP sheet material, has improved the firm of described protection constructional device.
Be illustrated in figure 3 as a kind of skeleton construction cathodic protector embodiment one cross-sectional structure synoptic diagram that need not to control provided by the invention; described reinforcing bar 4 is connected by described matrix material 2 with described CFRP sheet material 1. because in the application of reality; not just one of the number of steel bars that generally needs protection; be example as being two with the reinforcing bar number that needs protection among Fig. 3; so when it is protected; to be electrically connected 7 between two reinforcing bars 4, and detect the electrical connectivity between the reinforcing bar.
A kind of skeleton construction cathode protecting process and device that need not to control provided by the invention; described device adopts CFRP sheet material as supplementary anode; and export the stabilized power source of enough curtages and saved Controlling System and the check system in the conventional apparatus; not only can obtain desirable protection effect; effectively improve durability of structures, and controlled the cost of skeleton construction galvanic protection greatly.
Should be understood that application of the present invention is not limited to above-mentioned giving an example, for those of ordinary skills, can be improved according to the above description or conversion that all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (6)
1. a skeleton construction cathode protecting process that need not to control is characterized in that, may further comprise the steps:
A, remove in the protection zone loose concrete, and in concrete, occur inserting the matrix material with conducting function in the zone in crack;
B, in concrete the CFRP sheet material of implantation current auxiliary anode material, and with spacing of reinforcement setting in this CFRP sheet material and the concrete;
C, matrix material is covered on the described CFRP sheet surface of a corresponding side with reinforcing bar, and the matrix material that firmly pressurizes, make itself and CFRP sheet material and concrete binding together;
D, the positive pole of CFRP sheet material with a direct current power supply is connected, described reinforcing bar is connected with the negative pole of described direct supply; Described reinforcing bar links to each other by described concrete electric with described matrix material, and forms a loop line with described CFRP sheet material and described direct supply.
2. according to the described skeleton construction cathode protecting process that need not to control of claim 1, it is characterized in that described step B also comprises: be electrically connected between the reinforcing bar that needs are protected, and the electrical connectivity between the test reinforcing bar.
3. according to the described skeleton construction cathode protecting process that need not to control of claim 1, it is characterized in that described matrix material is cement paste or the epoxy resin glue that has added conductive particle.
4. skeleton construction cathodic protector that need not to control is characterized in that this device comprises:
Be used for being installed in the reinforcing bar in the concrete;
Be used for being installed in the concrete and as the CFRP sheet material of electric current auxiliary anode material,
And one carry out direct current power source supplying power for described device;
Described CFRP sheet material is by concrete and described spacing of reinforcement setting;
The CFRP sheet material is connected with the positive pole of described direct supply, and described reinforcing bar is connected with the negative pole of described direct supply; And a side corresponding with described reinforcing bar is provided with the matrix material with conducting function on described CFRP sheet material; Described reinforcing bar links to each other with described matrix material by described concrete with described CFRP sheet material, and forms a loop line with described direct supply.
5. according to the described skeleton construction cathodic protector that need not to control of claim 4; it is characterized in that the number of steel bars in the described concrete is at least 1, when the reinforcing bar number greater than 1 the time; be electrically connected between the reinforcing bar, and the electrical connectivity between the detection reinforcing bar.
6. according to the described skeleton construction cathodic protector that need not to control of claim 4, it is characterized in that described matrix material is cement paste or the epoxy resin glue that has added conductive particle.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310131402.0A CN103205759B (en) | 2013-04-16 | 2013-04-16 | A kind of skeleton construction cathode protecting process without the need to control and device |
| US14/253,837 US20140305807A1 (en) | 2013-04-16 | 2014-04-15 | Cathode Protection Method for Reinforced Concrete Structure and Apparatus Therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310131402.0A CN103205759B (en) | 2013-04-16 | 2013-04-16 | A kind of skeleton construction cathode protecting process without the need to control and device |
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| Publication Number | Publication Date |
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| CN103205759A true CN103205759A (en) | 2013-07-17 |
| CN103205759B CN103205759B (en) | 2016-01-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831288A (en) * | 2015-04-30 | 2015-08-12 | 深圳大学 | Reinforced concrete protection method and system through combination of cathode protection and structure reinforcement |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0147977A2 (en) * | 1983-12-13 | 1985-07-10 | RAYCHEM CORPORATION (a California corporation) | Novel anodes for cathodic protection |
| CN1180761A (en) * | 1997-10-31 | 1998-05-06 | 中国科学院上海硅酸盐研究所 | Mixed conductive anode coating composited by carbon fibre |
| JPH11200516A (en) * | 1998-01-20 | 1999-07-27 | Oriental Construction Co Ltd | Anticorrosion reinforcing concrete assembly, its anticorrosion method and assembling method |
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2013
- 2013-04-16 CN CN201310131402.0A patent/CN103205759B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0147977A2 (en) * | 1983-12-13 | 1985-07-10 | RAYCHEM CORPORATION (a California corporation) | Novel anodes for cathodic protection |
| CN1180761A (en) * | 1997-10-31 | 1998-05-06 | 中国科学院上海硅酸盐研究所 | Mixed conductive anode coating composited by carbon fibre |
| JPH11200516A (en) * | 1998-01-20 | 1999-07-27 | Oriental Construction Co Ltd | Anticorrosion reinforcing concrete assembly, its anticorrosion method and assembling method |
Non-Patent Citations (2)
| Title |
|---|
| S.GADVE ET AL.: "Active Protection of Fiber-Reinforced PolymerWrapped Reinforced Concrete Structures Against Corrosion", 《CORROSION》, vol. 67, no. 2, 28 February 2011 (2011-02-28), XP 001560059, DOI: doi:10.5006/1.3549564 * |
| 朱雅仙 等: "钢筋混凝土的阴极保护", 《腐蚀与防护》, vol. 29, 31 May 2008 (2008-05-31), pages 26 - 3 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831288A (en) * | 2015-04-30 | 2015-08-12 | 深圳大学 | Reinforced concrete protection method and system through combination of cathode protection and structure reinforcement |
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| CN103205759B (en) | 2016-01-27 |
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