JP3792646B2 - Anticorrosion reinforced concrete assembly, its anticorrosion method and assembly method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anticorrosion reinforced concrete assembly, an anticorrosion method thereof, and an assembly method.
[0002]
[Prior art]
In a concrete structure such as a reinforced concrete structure or a prestressed concrete structure, corrosion of the reinforcing bar or steel material may occur due to permeation of oxygen, water, chloride ions, or the like. When the steel material or the like is corroded in this way, cracks are generated in the concrete due to the corrosion products, further accelerating the corrosion, and finally the strength of the concrete structure is lowered.
[0003]
As a method for preventing the corrosion of such steel materials, there is an anticorrosion method. In other words, the anode reaction (oxidation reaction) and the cathode reaction (reduction reaction) occur simultaneously on the surface of the steel material or the like in the concrete structure in a state where the potential is not changed, and a corrosion cell is formed as a result. Corrosion occurs due to the occurrence of corrosion, etc., but by changing the potential of the steel material, only the cathode reaction can occur on the surface of the steel material, thereby preventing the generation of iron hydrated oxides, etc. Is something that can be done.
[0004]
Japanese Patent Application No. 11-200516 (Patent Document 1) discloses a technique for reinforcing the structural strength of a concrete structure while performing an anticorrosion method. That is, Patent Document 1 describes an anti-corrosion reinforced concrete assembly in which a carbon fiber sheet is provided on the surface of a concrete structure including concrete and steel, and a current-carrying means is connected to the steel and sheet. Electricity is applied so that the steel material is the cathode and the carbon fiber sheet is the anode.
[0005]
[Patent Document 1]
Japanese Patent Application No. 11-200516 [0006]
[Problems to be solved by the invention]
When the carbon fiber sheet is applied as an anode and strength reinforcement for cathodic protection as in Patent Document 1, the carbon fiber sheet is attached to the concrete structure surface with a conductive adhesive. This conductive adhesive is required to have a high electrical conductivity in order to allow a sufficient current to flow from the carbon fiber sheet to the steel material, and at the same time, a large adhesion strength is required to reinforce the concrete structure. However, it is not easy to freely adjust the conductivity and adhesion strength of the conductive adhesive.
Moreover, when a concrete structure exists especially in a coastal area, it is preferable to implement measures for preventing salt damage not only on the concrete structure but also on the carbon fiber sheet when performing the above-described electrocorrosion protection method. However, if the carbon fiber sheet acts as an anode during cathodic protection, oxygen gas and chlorine gas may be generated by this anodic reaction. Therefore, air permeability that can release these gases to the outside is also required.
[0007]
An object of the present invention is to provide an anti-corrosion reinforced concrete assembly in which a carbon fiber sheet is fixed to a concrete structure so that both sufficient conductive performance and adhesion strength can be obtained, and both an anti-corrosion effect and a reinforcement effect can be obtained. An object of the present invention is to provide a corrosion prevention method and an assembly method thereof.
[0008]
To provide an anti-corrosion reinforced concrete assembly capable of releasing oxygen gas and chlorine gas generated by an anodic reaction of a carbon fiber sheet and capable of protecting a concrete structure from salt damage, an anti-corrosion method and an assembling method thereof. is there.
[0009]
[Means for Solving the Problems]
The anticorrosion reinforced concrete assembly of the present invention provided to solve the above-described conventional problems is provided on a concrete structure including concrete and a steel material provided in the concrete, and on the surface of the concrete structure. A carbon fiber sheet, and a steel member and a current-carrying means connected to the carbon fiber sheet, wherein the carbon fiber sheet is coated with carbon fiber with nickel forming a passive film, and the surface of the concrete structure between the carbon fiber sheet, it said to suppress the destruction of the passive film, provided the filler layer comprising a p H 12 or more hydroxides and water, and the concrete structure by the filler layer characterized in that integrating the said carbon fiber sheet.
[0010]
In the present invention, since the carbon fiber sheet is a carbon fiber coated with nickel that forms a passive film, when this is used as an anode material, the polarization resistance can be reduced, and high anodic polarization or chloride However, it is possible to suppress the consumption of the carbon fiber sheet in a highly alkaline environment with a high concentration.
[0011]
In the present invention, between the concrete structure surface and the carbon fiber sheet, it provided the filler layer comprising a p H 12 or more hydroxides and water, efficient charge transfer reaction at the filler layer Proceed to This charge transfer reaction is different from electron conduction in that the surface of the anode (carbon fiber sheet) subjected to anticorrosion, the electrons in the anode and the negative ions in the filler layer at the interface between the anode and the filler layer. It is a reaction to transfer charges between the two. In the filler layer , negative ions move from the cathode (reinforcing bar) to the anode to carry charges. In other words, current flows from the anode through the filler layer to the cathode and is delivered from the anode to an external electrical circuit. As a result of the above action, on the cathode surface of the concrete structure subjected to cathodic protection, only the ionization reaction of oxygen occurs due to the flow of sufficient current to stop the anode reaction, and the corrosion reaction of the reinforcing bars is stopped. An effect is obtained.
[0012]
In the present invention, there is provided a method for preventing corrosion of a corrosion-resistant reinforced concrete assembly, wherein the steel material of the above-mentioned corrosion-resistant reinforced concrete assembly is used as a cathode and the carbon fiber sheet is energized as an anode.
[0013]
In the present invention, the surface of the concrete structure containing steel provided in the concrete and the inside concrete adhesive as filler layer comprising a hydroxide and water is left scheduled portion provided in striped pattern the layers provided by the carbon fiber sheets coated with nickel to form a passive film the adhesive layer affixed to the surface of the concrete structure, the tube on the carbon fiber sheet so as to communicate before Ki予 constant portion And filling the predetermined portion between the carbon fiber sheet and the surface of the concrete structure through the tube with the filler forming the filler layer, and using the steel material as a cathode and the carbon fiber sheet as an anode. A method for assembling the anti-corrosion reinforced concrete assembly is provided, wherein the energizing means is connected as follows.
In the above method for assembling the anticorrosion reinforced concrete assembly, when the carbon fiber sheet is affixed to the surface of the concrete structure with the adhesive layer, the place where the filler layer is to be provided on the concrete surface is surrounded by the carbon fiber sheet and the adhesive layer. If the tube is inserted into the striped space, a filler for forming a filler layer can be injected into the striped space through the tube. Therefore, it can be constructed relatively easily.
[0014]
In the method of assembling the anti-corrosion reinforced concrete assembly, following the step of connecting the energizing means, a means for forming an air passage at a position facing the filler layer with the carbon fiber sheet interposed therebetween is disposed. It is possible to perform a step of covering the entire surface of the carbon fiber sheet with an airtight sheet having water-proof and airtightness.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, between the concrete structure surface and the carbon fiber sheet, the adhesive layer, for suppressing the destruction of the passive film, and the filler layer comprising a p H 12 or more hydroxides and water Can be arranged so as not to overlap. As a result, the carbon fiber sheet is divided into a portion that fulfills the load-proof reinforcement function of the concrete structure and a portion that fulfills the electrode function, and the effects of both functions can be obtained reliably and efficiently.
That is, the carbon fiber sheet is firmly attached to and integrated with the surface of the concrete structure by the adhesive layer, and the strength of the concrete structure is reinforced by the tensile strength of the carbon fiber itself.
[0016]
In the present invention, the entire surface of the carbon fiber sheet is covered with an airtight sheet having water-proof and airtightness, and the filler layer is sandwiched between the airtight sheet and the carbon fiber sheet. It is preferable that an air passage communicating with the outside air is provided at a position facing the air. This ventilation path can be configured to include a spacing member and a ventilation member provided between the airtight sheet and the carbon fiber sheet.
Thus, by covering the entire outer surface of the carbon fiber sheet with an airtight sheet, oxygen, water, chloride ions, etc. cannot penetrate inside the airtight sheet, and not only the concrete structure but also the carbon fiber. The sheet is also protected from deterioration due to chloride ions and the like. In addition, since an air passage is provided between the hermetic sheet and the carbon fiber sheet, even when oxygen gas or chlorine gas is generated by the anodic reaction of the carbon fiber sheet, these gases are released to the outside. .
The gap holding member is not particularly limited as long as it can hold a predetermined gap between the airtight sheet and the carbon fiber sheet. For example, a bar made of synthetic resin or the like The synthetic resin rod may be extended to a position facing the filler layer. The ventilation member may be any member that can ensure air permeability so that the gap held by the spacing member is not clogged by the filler or the like. A flat perforated tube with a hole, a breathable sponge, a breathable synthetic resin fiber, or the like can be used.
[0017]
In the present invention, as the filler layer, it is possible to use a mixture containing cement, hydroxide and water, or a mixture containing bentonite, hydroxide and water. Although this hydroxide is not specifically limited, For example, it is preferable to use NaOH. NaOH exhibits strong alkalinity and is one of the particularly preferable passive protection agents for suppressing the destruction of the passive film.
In environments such as coastal areas where relatively many chlorine ions are present in the air, the passive film of nickel is susceptible to corrosion, but the filler layer contains hydroxide as a passive protection agent . , it is possible to suppress the destruction of the passive film of the carbon fiber sheet by the action of the hydroxide ions. Furthermore, since the hydroxide also has an effect of increasing the ionic conductivity as the electrolyte, durability of the carbon fiber sheet can be reduced by reducing the burden of the carbon fiber sheet as an electrode.
[0018]
The carbon fiber sheet is, for example, a sheet in which carbon fibers having a diameter of 7 to 10 μm extending in the length direction of the sheet are densely arranged, for example, 10 million or more per 1 m in the width direction and woven. The thing of 0.05-0.2 mm can be mentioned.
Also the carbon fiber sheet coated with nickel to form a passive film, For example, a sheet that is more thinly and uniformly coated on a metal having a nickel. As an aspect of the coating with nickel , for example, each carbon fiber is thinly and uniformly coated to form a carbon fiber sheet with this carbon fiber, or all of the front surface, back surface, and edges of the sheet Either of these embodiments can be selected.
[0019]
Before yn nickel is able to be energized with a high current density of the electrode, machining nor unchanged easy machining gap, wasting less, it is Ru cited as advantages no generation of sludge. Pure nickel has good corrosion resistance from room temperature to high temperature over the entire concentration of the caustic aqueous solution.
Among the carbon fiber sheets coated with nickel, for example, the volume resistivity of the carbon fiber sheet in which each carbon fiber is thinly and uniformly coated with nickel is 7.5 × 10 ⁻⁵ Ω · cm, This is preferable because the charging voltage of the anode can be further lowered.
The nickel-coated carbon fiber sheet has a tensile strength of about 3335 N / mm ² or more and a tensile elastic modulus of about 2.3 × 10 ⁵ N / mm ² in order to obtain a high-strength concrete anticorrosion reinforcement assembly. preferable.
[0020]
The carbon fiber sheet is a unidirectional sheet (one in which carbon fibers are densely arranged in only one direction on the surface of the sheet), and a bi-directional sheet (one direction on the surface of the sheet and a direction perpendicular thereto). Any of those in which carbon fibers are densely arranged) and those in which carbon fibers are arranged in more directions may be used. In particular, a bi-directional sheet that is excellent in linearity and that can more efficiently utilize the tensile strength of carbon fibers is preferable.
Moreover, the said carbon fiber sheet can contain other fibers other than a carbon fiber. Specifically, for example, fibers such as glass fibers for holding unidirectional carbon fibers can be included.
[0021]
The carbon fiber sheet may have a shape that conforms to the surface of a concrete structure having a rectangular shape or other shape, and can usually have a rectangular shape in which carbon fibers are densely arranged in at least the length direction thereof. .
[0022]
In the present invention, the carbon fiber sheet is preferably provided on the surface of the concrete structure so that the tensile strength of the carbon fibers is in a direction to reinforce the concrete structure. For example, a carbon fiber sheet can be provided on the bottom surface of an elongated rectangular parallelepiped beam so that the carbon fibers extend in the length direction. Moreover, in order to achieve the anticorrosion of the entire surface of the concrete structure, the anticorrosion reinforcing device and / or another electrode for anticorrosion can be provided on a surface other than the surface requiring reinforcement. Further, if necessary, one or more carbon fiber sheets can be provided on the surface of the concrete structure in order to achieve sufficient reinforcement.
[0023]
When the carbon fiber sheet is provided on the surface of the concrete structure, the carbon fiber sheet is attached to the surface of the concrete structure by the adhesive layer and the filler layer, and then an adhesive such as an epoxy resin is further added to the carbon fiber sheet. It is preferable to impregnate the carbon fiber sheet, whereby the adhesive strength and durability of the carbon fiber sheet can be improved.
[0024]
The adhesive layer and the filler layer are preferably arranged in a striped pattern extending in the fiber direction of the carbon fiber sheet. If arranged in this way, the electrode portion and the reinforcing portion of the carbon fiber can be uniformly dispersed, and the conductivity and tensile strength in the fiber direction are extremely high compared to the direction perpendicular to the fiber. The effect that the function can be effectively and uniformly used is obtained.
[0025]
The filler layer is composed of a filler containing hydroxide and water for suppressing the destruction of the passive film, and more specifically, a mixture containing cement, hydroxide and water, or bentonite. It can be comprised from the mixture containing a hydroxide and water.
Wherein in the mixture comprising cement and hydroxide and water, Portland cement is used, admixtures or admixtures is added paste Ru is generated. The cement paste is injected between the carbon fiber sheet and the concrete structure surface as an anode hardened by hydration reaction, the adhesion to the extent that the carbon fiber sheet is not peeled off from the concrete structure surface arise. The moisture in the capillary tube of the cement is retained after curing, and the cement component and hydroxide are present as an electrolyte in the moisture, and this filler layer has a volume resistance of about 1000 to 1500 Ω · cm in a highly alkaline environment of pH 12 or higher. shows an ion conductivity which indicates the rate.
On the other hand, the mixture containing bentonite, hydroxide and water is called a backfill (anode performance maintaining material), and this backfill lowers the ground resistance of the carbon fiber sheet as the anode and maintains the anode performance. In addition, it is a substance that fills the inner surface of the carbon fiber sheet. Examples of the mixture containing bentonite include a mixture of bentonite, hydroxide, water, gypsum, and magnesium chloride, bentonite, hydroxide, water, coke, gypsum having a weight ratio of 40%, and NaCl having a weight ratio of 10%. mixture consisting of mixtures consisting of bentonite and calcium sulfate and slaked lime and water.
[0026]
The adhesive layer may be any layer as long as the carbon fiber sheet adheres firmly to the surface of the concrete structure. For example, an epoxy resin may be used, and when the carbon fiber sheet is cured, the adhesive layer is between the concrete surface and the carbon fiber sheet. It is preferable that an adhesive strength of 20 kgf / cm 2 or more is obtained.
[0027]
The assembly of the present invention includes a current-carrying device for supplying a corrosion-proof current. The energization device is not particularly limited as long as it can supply the anticorrosion current, and various DC stabilized power supply devices such as commercially available ones can be used. It is preferable that a steel material is connected to the cathode of the current-carrying device and a carbon fiber sheet is connected to the anode of the current-carrying device because the anticorrosion can be effectively performed. The connection between the current-carrying device and the carbon fiber sheet is not particularly limited as long as electrical connection is achieved, and may be detachable, fixed, or integrally formed.
[0028]
The anticorrosion reinforced concrete assembly of the present invention can include a reference electrode for adjusting the amount of anticorrosion current in the electrocorrosion prevention, confirming the anticorrosion effect by the reinforcing bar potential, and the like, if necessary. As the reference electrode, a silver chloride electrode or a lead electrode can be used. The reference electrode is preferably provided in the vicinity of the steel material in the concrete structure.
[0029]
The concrete constituting the concrete structure includes hardened mortar, cement paste, etc. in addition to ordinary concrete including cement, water, fine aggregate, coarse aggregate and the like. The concrete structure is a structure including the concrete and a steel material. The steel material refers to a metal widely provided in concrete, and a metal provided in concrete for the purpose of enhancing the durability of concrete, such as a steel material provided in reinforced concrete and a steel material provided in prestressed concrete. Including.
[0030]
The anticorrosion reinforced concrete assembly of the present invention can be assembled for newly constructing a concrete structure, but as a repair of the existing concrete structure, the carbon fiber sheet is provided on the surface of the existing concrete structure, It can also be assembled by connecting a current-carrying device so that the steel material in the existing concrete is the cathode and the carbon fiber sheet is the anode.
[0031]
When assembling the anticorrosion reinforced concrete assembly of the present invention as a repair of an existing concrete structure, prior to the provision of the anticorrosion reinforcement device, the steel material in the concrete structure is provided with a drain terminal, etc. It is preferable to provide the reference electrode in Moreover, it is preferable to confirm whether all the steel materials in the concrete structure are electrically connected and to conduct the steel materials by welding or the like as necessary. Then, it is preferable to perform a treatment such as removing dirt, latency, etc. adhering to the surface of the concrete structure by sandblasting, ultra-high pressure water jet or the like, and further removing concrete powder with compressed air.
[0032]
Sticking of the carbon fiber sheet, to paste the masking tape to the Filling material layer pre Tei箇 plant is provided in dry concrete structure surface, the concrete surface to the masking tape is not stuck in a roller brush or a rubber spatula or the like The adhesive is uniformly applied, and then the masking tape is peeled off, the carbon fiber sheet is immediately attached, and the sheet surface is pressed in the fiber direction with a rubber spatula or the like. After the carbon fiber sheet is pasted, at least two pipes are passed through the carbon fiber sheet so as to communicate with the planned location where the filler layer is provided, and air is discharged from one pipe while passing through the other pipe. The filler can be injected between the carbon fiber sheet and the concrete structure surface, and then further impregnated with an adhesive for impregnation from above the carbon fiber sheet.
[0033]
In the anticorrosion method of the present invention, corrosion can be prevented by energizing the steel material in the anticorrosion reinforced concrete assembly as a cathode and the carbon fiber sheet as an anode.
[0034]
Since the preferable energization amount at the time of energization varies depending on the structure of the anticorrosion reinforced concrete assembly, etc., it is preferably determined by an energization test. Specifically, it can be determined by the following procedure.
1) The natural potential of the steel material is measured.
2) Obtain the relationship between the amount of energized current and the potential of the steel material by a polarization test.
3) An energization current amount for obtaining a required polarization amount from a natural potential is obtained.
4) Energize for 24 hours or longer with the energization current obtained in 3).
5) It is confirmed whether a predetermined depolarization amount (100 mV or more) can be obtained by a depolarization test.
[0035]
【Example】
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.
[0036]
FIG. 4 is a schematic view showing the anticorrosion reinforced concrete assembly 1 of the present invention.
The anti-corrosion reinforced concrete assembly 1 is a structure in which a carbon fiber sheet 5 is provided on the surface of an existing reinforced concrete structure 3 and a power supply device 8 is connected to the rebar 2 and the carbon fiber sheet 5. 3 and the carbon fiber sheet 5 are divided so that the adhesive layer 22 and the filler layer 24 containing hydroxide and water for suppressing the destruction of the passive film do not overlap. Are arranged.
[0037]
If it demonstrates in detail, the deterioration part of the existing reinforced concrete structure 3 will be pinched, the surface metal of concrete will be removed, and the concrete surface will be ground-treated with cement paste. A lead wire is connected to the reinforcing bar 2 in the concrete by spot welding, and a discharge terminal 9a and a measurement terminal 12 are provided. And the silver chloride collation electrode 10 is fixed to the reinforcing bar 2 with a plastic band. Further, whether or not all the reinforcing bars 2 existing in the reinforced concrete structure are electrically connected is measured, and if any reinforcing bars are not connected, they are connected by welding and all the reinforcing bars are connected.
[0038]
Next, dirt, latency, etc. adhering to the surface of the concrete structure 3 are removed by sandblasting, ultra-high pressure water jet or the like, and concrete powder is removed by compressed air. After the surface of the concrete was dried, the concrete surface, the masking tape 21 as shown in FIG. 1 is affixed to the vertical pattern shape pre Tei箇 plants providing the charging Hamazai layer 24, these masking tape 21 is attached An epoxy resin adhesive is uniformly applied to the concrete surface with a roller brush or rubber spatula to form an adhesive layer 22 as shown in FIG. 2, and then the masking tape 21 is peeled off, and the carbon fiber sheet 5 is immediately removed. Affixed and the sheet surface is rubbed with a rubber spatula in the fiber direction and fixed. As the carbon fiber sheet 5, a carbon fiber coated with nickel that forms a passive film is used.
[0039]
When the carbon fiber sheet 5 is affixed, gaps are formed at the marks where the masking tapes 21 are peeled off, so that at least two pipes penetrate the carbon fiber sheet 5 from the outside and communicate with the gaps. That is, a filler injection pipe (not shown) and an air discharge pipe (not shown) for forming the filler layer 24 are provided. When the filler is injected into each gap through these injection pipes and the filler comes out of the air discharge pipe, the injection of the filler is stopped. As this filler, a cement paste produced by adding NaOH as a passive protective agent to water and mixing it with cement is used. When the filler is injected into the gaps as described above, the adhesive layer 22 and the filler layer 24 are alternately arranged in a vertical stripe shape as shown in FIG.
Then, the epoxy resin adhesive 6 is impregnated into the fiber from above the carbon fiber sheet 5, and the carbon fiber sheet 7 can be attached as shown in FIG. 4.
[0040]
After a long metal plate 4 is fixed to the end of the carbon fiber sheet and the lead wire 9b is connected to the long plate 4, the installed carbon fiber sheet anode is electrically connected using a DC voltmeter. Is confirmed.
[0041]
Furthermore, a power supply box that houses the DC power supply device 8 is fixed to a concrete base with anchor bolts. These are connected to the DC power supply device 8 so that the discharge terminal 9a is on the cathode side and the lead wire 9b is on the anode side. All the wires and connection points for connection are treated with an insulating material and a waterproof material.
As described above, the anticorrosion reinforced concrete assembly 1 of the present invention is formed.
[0042]
Next, an embodiment of the present invention different from the above will be described with reference to a partially enlarged sectional view of FIG. 5, the same components as those described in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.
The anticorrosion reinforced concrete assembly shown in FIG. 5 is provided separately on the surface of the existing reinforced concrete structure 3 so that the adhesive layer 22 and the filler layer 24 do not overlap each other, and the carbon fiber sheet 5 is provided on the outside thereof. And the filler 24a oozes out of the carbon fiber sheet 5. The spacing member 31 made of a synthetic resin rod is fixed so as to extend to both sides along the oozing filler 24a, and the ventilation member 32 is in contact with the filler 24a between the spacing members 31. The airtight sheet 33 is provided so as to be fixed and cover all of the above configuration together with the carbon fiber sheet 5 from the outside.
The spacing member 31 and the ventilation member 32 constitute an air passage. When oxygen gas or chlorine gas is generated by the anodic reaction of the carbon fiber sheet 5, these air passages make these gases airtight. It leads to the outside of the sheet 33. The spacing member 31 and the ventilation member 32 are fixed by an adhesive or a fixture. Moreover, the said airtight sheet | seat 33 can use the nonelectroconductive sheet formed, for example with the aramid fiber etc., and is fixed with an adhesive agent. The filler layer 24 are those containing a p H 12 or more hydroxides and water to suppress the destruction of the passive film. In addition, the same structure as what was demonstrated in FIG. 4 is taken as the structure for supplying electricity by using the steel material of the anticorrosion reinforced concrete assembly as the cathode and the carbon fiber sheet as the anode.
[0043]
As described above, the entire outer surface of the carbon fiber sheet 5 is covered with the airtight sheet 33, so that oxygen, water, chloride ions and the like cannot permeate inside the airtight sheet 33, and only the reinforced concrete structure 3 is present. The carbon fiber sheet 5 can also be protected from deterioration due to chloride ions or the like. At the same time, an air passage is formed between the airtight sheet 33 and the carbon fiber sheet 5 by the gap maintaining member 31 and the ventilation member 32, and oxygen gas, chlorine gas, and the like pass through this air passage. It is discharged outside the airtight sheet 33.
[0044]
When the anticorrosion reinforced concrete assembly described with reference to FIG. 5 is constructed as described above, in addition to the assembly method described with reference to FIGS. The gap holding member 31 and the ventilation member 32 are disposed at a position opposite to the position 24 to form a ventilation path, and then the entire surface of the carbon fiber sheet 5 is covered with an airtight sheet 33 having water-proof and airtightness. By performing the process, the anticorrosion reinforced concrete assembly of FIG. 5 is formed.
[0045]
【The invention's effect】
In the anticorrosion reinforced concrete assembly of the present invention, since a filler layer containing hydroxide and water is provided between the surface of the concrete structure and the carbon fiber sheet, the charge transfer reaction is efficient in this filler layer. It can go well.
The anticorrosion reinforced concrete assembly of the present invention, so as not to overlap with the adhesive layer and the filler layer is, when it is placed into a divided separately on the concrete surface, the carbon fiber sheet concrete structures surface by an adhesive layer While the strength of the concrete structure is reinforced, the filler layer can provide a stable potential distribution to the concrete structure, and corrosion prevention can be achieved at a lower voltage compared to the prior art. It becomes possible. Further, since the area ratio between the adhesive layer and the filler layer can be easily adjusted, it is possible to freely adjust the anticorrosion effect and the strength reinforcement effect.
Further, in the anticorrosion reinforced concrete assembly of the present invention, the entire surface of the carbon fiber sheet is covered with an airtight sheet having water-proof and airtightness, and communicates with the outside air at a position facing the filler layer with the carbon fiber sheet interposed therebetween. If air passage which is provided, oxygen, water and chloride ions are not able to penetrate to the inside than the airtight sheet, even carbon fiber sheet not concrete structures only protected from degradation due to chloride ion, etc. Furthermore, oxygen gas and chlorine gas generated by the anodic reaction of the carbon fiber sheet can be released to the outside through the ventilation path.
[Brief description of the drawings]
FIG. 1 is a view for explaining the configuration of a corrosion-proof reinforced concrete assembly of the present invention.
FIG. 2 is a view for explaining the configuration of the anticorrosion reinforced concrete assembly of the present invention.
FIG. 3 is a cross-sectional view for explaining the configuration of the anticorrosion reinforced concrete assembly of the present invention.
FIG. 4 is a view showing an example of an anticorrosion reinforced concrete assembly of the present invention.
FIG. 5 is a partially enlarged cross-sectional view showing different embodiments of the anticorrosion reinforced concrete assembly of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Corrosion-proof reinforcement concrete 2 Reinforcement 3 Reinforced concrete structure 5 Carbon fiber sheet 6 Epoxy resin adhesive 7 Carbon fiber sheet 8 Power supply device 9a Exhaust terminal 9b Lead wire 10 Reference electrode 11 Voltmeter 12 Measurement terminal 22 Adhesive layer 24 Filler layer

Claims (9)

A concrete structure including concrete and a steel material provided in the concrete; a carbon fiber sheet provided on a surface of the concrete structure; and an energization means connected to the steel material and the carbon fiber sheet.
The carbon fiber sheet is a carbon fiber coated with nickel forming a passive film,
Between the concrete structure surface and the carbon fiber sheet, said to suppress the destruction of the passive film, the filler layer is provided which includes a p H 12 or more hydroxides and water, said filler layer An anticorrosion reinforced concrete assembly in which the concrete structure and the carbon fiber sheet are integrated by the above.   In addition to the filler layer, an adhesive layer for further strengthening the adhesion between the concrete structure surface and the carbon fiber sheet is provided, and the adhesive layer and the filler layer The anticorrosion reinforced concrete assembly according to claim 1, wherein the anticorrosion reinforced concrete assemblies are arranged separately. The entire surface of the carbon fiber sheet is covered with an airtight sheet having water shielding and airtightness, and the position facing the filler layer with the carbon fiber sheet sandwiched between the airtight sheet and the carbon fiber sheet corrosion reinforced concrete assembly according to claim 2, characterized in that a ventilation path communicating to the outside air in.   The anti-corrosion reinforced concrete assembly according to claim 3, wherein the air passage includes a gap maintaining member and a air vent member provided between the air-tight sheet and the carbon fiber sheet.   The anticorrosion reinforced concrete assembly according to any one of claims 1 to 4, wherein the filler layer is a mixture containing cement, hydroxide and water, or a mixture containing bentonite, hydroxide and water. .   The anticorrosion reinforced concrete assembly according to claim 5, wherein the filler layer and the adhesive layer are arranged in a striped pattern extending in a fiber direction of the carbon fiber sheet.   An anticorrosion reinforced concrete assembly, wherein the steel material of the anticorrosion reinforced concrete assembly according to any one of claims 1 to 6 is energized so that the steel material is a cathode and the carbon fiber sheet is an anode. Anticorrosion method. The surface of the concrete structure containing steel provided in the concrete and the inside concrete adhesive as filler layer comprising a p H 12 or more hydroxides and water is left planned portion provided in striped pattern A carbon fiber sheet coated with nickel that forms a passive film is pasted on the surface of the concrete structure with the adhesive layer, and the carbon fiber sheet penetrates the tubular body so as to communicate with the predetermined location. The filler forming the filler layer is injected into the predetermined portion between the carbon fiber sheet and the concrete structure surface through the tube, and the steel material is used as a cathode and the carbon fiber sheet is used as an anode. A method for assembling the anti-corrosion reinforced concrete assembly, wherein the energizing means is connected. The surface of the concrete structure containing steel provided in the concrete and the inside concrete adhesive as filler layer comprising a p H 12 or more hydroxides and water is left planned portion provided in striped pattern A carbon fiber sheet coated with nickel that forms a passive film is pasted on the surface of the concrete structure with the adhesive layer, and the carbon fiber sheet penetrates the tubular body so as to communicate with the predetermined location. The filler forming the filler layer is injected into the predetermined portion between the carbon fiber sheet and the concrete structure surface through the tube, and the steel material is used as a cathode and the carbon fiber sheet is used as an anode. A means for forming an air passage is disposed at a position facing the filler layer with the carbon fiber sheet sandwiched between the energizing means so as to have a water shielding property and an air tightness. A method for assembling an anticorrosion reinforced concrete assembly, wherein the entire surface of the carbon fiber sheet is covered with an airtight sheet.

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