CN103205757A - Cathode protection method and cathode protection device for reinforced concrete adopting CFRP (carbon fibre reinforced plastics) anode - Google Patents
Cathode protection method and cathode protection device for reinforced concrete adopting CFRP (carbon fibre reinforced plastics) anode Download PDFInfo
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- CN103205757A CN103205757A CN2013101313456A CN201310131345A CN103205757A CN 103205757 A CN103205757 A CN 103205757A CN 2013101313456 A CN2013101313456 A CN 2013101313456A CN 201310131345 A CN201310131345 A CN 201310131345A CN 103205757 A CN103205757 A CN 103205757A
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Abstract
The invention discloses a cathode protection method and a cathode protection device for reinforced concrete adopting a CFRP (carbon fibre reinforced plastics) anode. The device comprises a reinforcing steel bar embedded with concrete, a CFRP sheet material used as a current auxiliary anode material, and a direct-current power supply used for supplying power to the device, wherein a binding material for connecting the CFRP sheet material with concrete is arranged between the CFRP sheet material and concrete. The CFRP sheet material is used as the auxiliary anode of the protection device, so that the cost is greatly reduced while an ideal protection effect is obtained; and the CFRP sheet material is bound with the concrete by the binding material in the installation method, so that the device has the characteristics of being large in coverage area, and simple and convenient to install.
Description
Technical field
The present invention relates to the impressed current cathodic protection field, relate in particular to the skeleton construction cathode protecting process and the device that adopt the CFRP anode.
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 view of this, prior art is demanded urgently improving and development.
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; it is good electrical conductivity and near the electropotential of precious metal; CFRP has good electrochemical properties equally; therefore, the electrochemical properties of CFRP forms the impressed current cathodic protection method that a kind of novel supplementary anode may be used on skeleton construction.
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 cathode protecting process and device of the CFRP of employing anode; be intended to solve in the prior art carrying out skeleton construction and cause using limited deficiency when carrying out impressed current cathodic protection because supplementary anode is expensive; a kind of novel auxiliary anode material is provided; in the ideal effect that reaches the protection concrete structure, reduced cost.
Technical scheme of the present invention is as follows:
Adopt the skeleton construction cathode protecting process of CFRP anode, 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, 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;
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;
E, the control device and that series connection one is used for that the size of current of skeleton construction impressed current catholic protection device is controlled in described loop are used for the proofing unit that the corrosion condition to described reinforcing bar detects.
The method of the skeleton construction galvanic protection of described employing CFRP anode, wherein, described step e also comprises: be electrically connected between the reinforcing bar that needs are protected, and the electrical connectivity between the test reinforcing bar.
The skeleton construction cathode protecting process of described employing CFRP anode, wherein, described matrix material is cement paste or the epoxy resin glue that has added conductive particle.
Adopt the skeleton construction cathodic protector of CFRP anode, 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;
Described device also comprises the Controlling System that a size of current in the described device that is connected with described direct supply is controlled;
Described device also comprise one with the described reinforcing bar proofing unit that corrosion condition to described reinforcing bar detects that links to each other with concrete.
The skeleton construction cathodic protector of described employing CFRP anode, 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 skeleton construction cathodic protector of described employing CFRP anode, 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 CFRP of employing is skeleton construction impressed current cathodic protection method and the device of supplementary anode; described device adopts the CFRP sheet material as supplementary anode; not only can obtain desirable protection effect; and with prior art in use the mixed metal oxide titanium to compare can to reduce the protection cost greatly; this device adopts matrix material that the entire structure of device is fixed up, and has advantages such as the big and distribution of current of area coverage is even.
Description of drawings
Fig. 1 is the skeleton construction cathode protecting process most preferred embodiment flow chart of steps of employing CFRP anode of the present invention.
Fig. 2 is the structural representation of the skeleton construction cathodic protector of employing CFRP anode of the present invention.
Fig. 3 is the cross-sectional structure synoptic diagram of the skeleton construction cathodic protector of employing CFRP anode of the present invention.
Embodiment
The invention provides a kind of method and device of skeleton construction impressed current cathodic protection, 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 the skeleton construction cathode protecting process that adopts the CFRP anode, it is characterized in that this method may further comprise the steps:
H1, 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.
H2, 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; the CFRP material also has corrosion-resistant advantage, has good resistibility for the electrochemical reaction product that produces on its surface.
In addition, CFRP is that supplementary anode refers to and utilizes the CFRP electrochemical properties to be the supplementary anode of foundational development, comprise such as by mixing matrix material that different fibers or body material produce etc., for example mixed the fibre reinforced composites of carbon fiber and glass fibre etc.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 material of electric current auxiliary anode material; what can expect is; in specific embodiment, can use CFRP sheet material and CFRP cloth; this the best implements to select to use 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.
H3, 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.
H4, 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 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, itself and CFRP sheet surface glutinous company mutually not only self have very high intensity, and it can improve the stability of whole concrete structure with CFRP sheet material and concrete binding together.
Through research, the thickness that draws described matrix material is best for about 3mm.
Described concrete is continuous ionogen, if the crack then should in time use the cement paste 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.
H5: series connection one is used for the proofing unit that the performance of control device that the size of current of skeleton construction impressed current catholic protection device is controlled and a pair of described reinforcing bar detects in described series loop.
Described proofing unit feeds back to Controlling System with the corrosion condition of the reinforcing bar of test, and whether decision needs to regulate the size of current in the skeleton construction impressed current catholic protection device.
The method of impressed current cathodic protection provided by the invention; because adopt the CFRP material as supplementary anode, use for reference the construction technology of CFRP ruggedized construction, with matrix material the CFRP material is bonded in concrete surface; need not main equipment, have the easy-to-install benefit.
Also comprise among the above-mentioned steps H5: be electrically connected between the reinforcing bar that needs are protected, and the electrical connectivity between the test reinforcing bar.
In addition; as shown in Figure 2; the present invention also provides and adopted CFRP is the skeleton construction impressed current catholic protection device of supplementary anode, is the structural representation of the skeleton construction cathodic protector of employing CFRP anode of the present invention as described in Figure 2, and this device is by forming with the lower section:
The reinforcing bar 4 that described device is protected in advance, contain 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 embedded 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 with concrete 3 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.
In the closed series loop of above-mentioned reinforcing bar 4, described concrete 3, described matrix material 2 and described CFRP sheet material 1 and described direct supply 5 formation, increase the Controlling System 6 that the size of current in the described device that is connected with described direct supply is controlled; the size that this Controlling System 6 can reasonably be regulated protective current according to the concrete needs of reinforcing bar protection, thus better whole device is regulated and control.
For better performance to reinforcing bar detects; between reinforcing bar and concrete, set up a proofing unit 8; this proofing unit 8 and Controlling System 6 combine and can obtain its maintenance situation of concrete structure easily, are convenient to according to the present situation of this concrete structure it reasonably be protected.
Employed matrix material 2 is cement paste or the epoxy resin glue that has added conductive particle in above-mentioned specific embodiment of the present invention.
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.
The device of a kind of skeleton construction impressed current cathodic protection 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 the cross-sectional structure synoptic diagram of a kind of skeleton construction impressed current catholic protection device provided by the invention; 1 is CFRP sheet material as supplementary anode among the figure; concrete 3 is connected by matrix material 2 with CFRP sheet material 1, and the reinforcing bar 4 that 8 pairs of proofing units are imbedded in the concrete 3 detects in real time.Because in the application of reality; not just one of the number of steel bars that generally needs protection is example as being two with the reinforcing bar number that needs protection among Fig. 3, when reinforcing bar is protected; need will be electrically connected 9 between two reinforcing bars 4, and detect the electrical connectivity between the reinforcing bar.
The method of a kind of skeleton construction impressed current cathodic protection provided by the invention and device; this device by use price than the cheap CFRP material of the mixed metal oxide titanium that uses in the prior art as supplementary anode; and use and have electroconductibility and bigger matrix material connecting reinforcement and the CFRP sheet material of hardness own; thereby can when obtaining desirable protection effect, protection cost and the steadiness that has strengthened protector have been reduced.Described installation method does not need main equipment because the matrix material that uses directly is bonded in the surface of concrete and CFRP sheet material, and simple installation is easy to implement.
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. adopt the method for the skeleton construction galvanic protection of CFRP anode, it 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, 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;
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;
E, the control device and that series connection one is used for that the size of current of skeleton construction impressed current catholic protection device is controlled in described loop are used for the proofing unit that the corrosion condition to described reinforcing bar detects.
2. according to the method for the skeleton construction galvanic protection of the described employing of claim 1 CFRP anode, it is characterized in that described step e 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 method that adopts the skeleton construction galvanic protection of CFRP anode 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. adopt the device of the skeleton construction galvanic protection of CFRP anode, it 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;
Described device also comprises the Controlling System that a size of current in the described device that is connected with described direct supply is controlled;
Described device also comprise one with the described reinforcing bar proofing unit that corrosion condition to described reinforcing bar detects that links to each other with concrete.
5. according to the described device that adopts the skeleton construction galvanic protection of CFRP anode 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 device that adopts the skeleton construction galvanic protection of CFRP anode 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 |
|---|---|---|---|
| CN201310131345.6A CN103205757B (en) | 2013-04-16 | 2013-04-16 | Adopt skeleton construction cathode protecting process and the device of CFRP anode |
| US14/253,837 US20140305807A1 (en) | 2013-04-16 | 2014-04-15 | Cathode Protection Method for Reinforced Concrete Structure and Apparatus Therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310131345.6A CN103205757B (en) | 2013-04-16 | 2013-04-16 | Adopt skeleton construction cathode protecting process and the device of CFRP anode |
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| CN103205757A true CN103205757A (en) | 2013-07-17 |
| CN103205757B CN103205757B (en) | 2016-01-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103469212A (en) * | 2013-08-05 | 2013-12-25 | 青岛双瑞海洋环境工程股份有限公司 | Positive electrode conductive filler used for negative electrode protection system of reinforced concrete |
| 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 |
| CN106673527A (en) * | 2017-01-03 | 2017-05-17 | 深圳大学 | Cement-based inorganic cementing material and preparation method thereof |
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| 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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469212A (en) * | 2013-08-05 | 2013-12-25 | 青岛双瑞海洋环境工程股份有限公司 | Positive electrode conductive filler used for negative electrode protection system of reinforced concrete |
| CN103469212B (en) * | 2013-08-05 | 2015-11-25 | 青岛双瑞海洋环境工程股份有限公司 | For the anode conducting weighting material of protecting reinforced concrete cathode system |
| 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 |
| CN106673527A (en) * | 2017-01-03 | 2017-05-17 | 深圳大学 | Cement-based inorganic cementing material and preparation method thereof |
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