AU2021104932A4 - Conductive structural adhesive for reinforcement of concrete structure and preparation method and application - Google Patents
Conductive structural adhesive for reinforcement of concrete structure and preparation method and application Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 82
- 239000000853 adhesive Substances 0.000 title claims abstract description 69
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 69
- 230000002787 reinforcement Effects 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 32
- 239000010439 graphite Substances 0.000 claims abstract description 32
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 150000003017 phosphorus Chemical class 0.000 claims abstract description 20
- 239000003822 epoxy resin Substances 0.000 claims abstract description 17
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 239000002270 dispersing agent Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 238000004210 cathodic protection Methods 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 10
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 230000007935 neutral effect Effects 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical group OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims description 4
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 4
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 4
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 abstract description 11
- 239000004917 carbon fiber Substances 0.000 abstract description 11
- 239000004744 fabric Substances 0.000 abstract description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 11
- 239000010405 anode material Substances 0.000 abstract description 4
- 230000009977 dual effect Effects 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- 239000011150 reinforced concrete Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000000840 electrochemical analysis Methods 0.000 description 2
- 238000006056 electrooxidation reaction Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 238000001453 impedance spectrum Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011376 self-consolidating concrete Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/015—Anti-corrosion coatings or treating compositions, e.g. containing waterglass or based on another metal
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2463/00—Presence of epoxy resin
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F2201/00—Type of materials to be protected by cathodic protection
- C23F2201/02—Concrete, e.g. reinforced
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/20—Constructional parts or assemblies of the anodic or cathodic protection apparatus
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The conductive structural adhesive for reinforcement of concrete structure is provided,
comprising: a preparation method and an application of the conductive structural adhesive
for reinforcement of concrete structure. The conductive structural adhesive for
5 reinforcement of concrete structure includes a component A and a component B, wherein
the component A comprises following raw materials: epoxy resin, activated phosphorus
flake graphite, ethanol and dispersant; and the component B comprises curing agent; the
conductive structural adhesive for reinforcement of concrete structure of the present
invention has excellent conductivity and good mechanical properties, and can realize the
10 dual purpose of carbon fiber cloth reinforcement of the concrete structure and being used
as an anode material.
2/5
FIG. 2
Description
2/5
FIG. 2
[0001] The present invention relates to a conductive adhesive, in particular to a conductive structural adhesive for reinforcement of concrete structure and preparation method and application.
[0002] Reinforced concrete structure is used in marine environment or in environment polluted by salt or other environments, and the mechanical properties of the structure are degraded due to corrosion of steel bars, which has seriously affected their safety and usability. Because the corrosion of steel bars in concrete belongs to electrochemical corrosion, and cathodic protection can directly restrain the electrochemical corrosion process of steel bars and effectively protect steel bars, and cathodic protection has been widely used. Cathodic protection is the use of impressed current or introduction of more negative potential anode material to make the steel bars cathodic polarization and the steel bars can be protected; wherein: since that carbon fib polymeric material has good conductivity and corrosion resistance, it is a new cathodic protection method to bond carbon fiber cloth on the corroded components and act as the anode material of cathodic protection while it is used for reinforcement to achieve the dual purpose of reinforcing and preventing steel corrosion. However, the general adhesive for the reinforcement of concrete structure has no conductivity, which leads to the failure of electrical connection between carbon fiber cloth and steel bar and the failure of cathodic protection. Therefore, the preparation of conductive structural adhesive is the core problem of carbon fiber reinforced concrete structure cathodic protection. In order to achieve the purpose of strengthening concrete structure and cathodic protection at the same time, the conductive adhesive should not only have the bond strength required by the specification for strengthening concrete structure, but also have good conductivity.
[0003] At present, preparation of conductive adhesive is usually made by adding conductive materials into polymer matrix, but it is mainly used in waveguide, printed circuit, electronic instrument, electronic package and other fields, without the high strength required for structural reinforcement. In order to solve these problems, a new type of conductive structural adhesive is urgently needed.
[0004] In view of above background, the present invention provides a conductive structural adhesive for reinforcement of concrete structure and a preparation method and application of the conductive structural adhesive for reinforcement of concrete structure, so as to solve or partially solve the technical problems existing in the prior art.
[0005] In the first aspect, the present invention provides the conductive structural adhesive for reinforcement of concrete structure comprising: a component A and a component B, wherein the component A comprises following raw materials in parts by a weight: from 80 to 120 parts of epoxy resin, from 25 to 35 parts of activated phosphorus flake graphite, from 5 to 10 parts of ethanol and from 1 to 3 parts of dispersant;
[0006] the component B comprises from 10 to 15 parts of curing agent;
[0007] the epoxy resin is bisphenol A type epoxy resin;
[0008] the dispersant is polyvinyl pyrrolidone;
[0009] the curing agent is triethanolamine; and
[0010] a particle size of the activated phosphorus flake graphite is from 10 to 44 m.
[0011] Preferably, the conductive structural adhesive for reinforcement of concrete structure, comprising: a preparation method of the activated phosphorus flake graphite is: putting flake graphite in sodium hydroxide solution with a mass concentration of 5% to 15%, heating at 90° C to 100° C for 8 minutes to 15 minutes, and cooling to a room temperature, filtering, and washing to neutral; then putting the flake graphite in nitric acid solution with the mass concentration of 5% to 15%, heating at 90°C to 100°C for 8 minutes to minutes, cooling to the room temperature, filtering, washing to neutral, and drying to obtain the activated phosphorus flake graphite.
[0012] In the second aspect, the present invention provides a preparation method of the conductive structural adhesive for reinforcement of concrete structure comprising following steps:
[0013] mixing the epoxy resin and the ethanol, adding the activated phosphorus flake graphite and the dispersant, and adding the curing agent to obtain the conductive structural adhesive for reinforcement of concrete structure.
[0014] Preferably, mixing the epoxy resin and the ethanol and then pouring mixed solution into a ultrasonic vibrator and keeping ultrasonic vibration for 5 minutes to 15 minutes, then adding the activated phosphorus flake graphite and the dispersant to continue the ultrasonic vibration for 10 minutes to 20 minutes, and then adding the curing agent to continue the ultrasonic vibration for 5 minutes to 10 minutes, so as to obtain the conductive structural adhesive for reinforcement of concrete structure.
[0015] In the third aspect, the present invention provides an application of the conductive structural adhesive for reinforcement of concrete structure, comprising: the conductive structural adhesive for reinforcement of concrete structure is used as bonding adhesive for engineering structure and secondary anode for cathodic protection.
[0016] The conductive structural adhesive for reinforcement of concrete structure and the preparation method of conductive structural adhesive for reinforcement of concrete structure of the present invention have the following beneficial effects compared with the prior art:
[0017] (1) the conductive structural adhesive for reinforcement of concrete structure of the present invention adopts epoxy resin with high cohesion strength and good adhesion as the matrix, phosphorus flake graphite with good conductivity, stable resistance and low price as the conductive material, and is supplemented with other self-adding additives as the component A; the component B is curing agent triethanolamine. The experimental results show that the conductive structural adhesive for reinforcement of concrete structure of the present invention has excellent conductivity and good mechanical properties, and can realize the dual purpose of carbon fiber cloth reinforcement of the concrete structure and being used as an anode material.
[0018] (2) the tensile strength of the conductive structural adhesive for reinforcement of concrete structure of the present invention should be > 38 MPa, the flexural strength should be > 50 MPa, and the compressive strength should be > 70 MPa. The volume resistivity of the conductive structural adhesive for reinforcement of concrete structure of the present invention is less than 1-cm, which meets the requirements of a conductive coating layer anode for cathodic protection; after several tests, it is proved that the conductive structural adhesive for reinforcement of concrete structure of the present invention is effective as both the reinforcement adhesive and the cathodic protection secondary anode of the engineering structure.
In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the following will briefly describe the figures to be used in the embodiments or the prior art description.
[0019] FIG. 1 shows a SEM view of a conductive structure for the conductive structural adhesive for reinforcement of concrete structure prepared in Embodiment 1 of the present invention;
[0020] FIG. 2 shows a photograph of a specimen of a corroded reinforced concrete column reinforced with CFRP bonded with the conductive structural adhesive for reinforcement of concrete structure prepared in Embodiment 1;
[0021] FIG. 3 shows the electrochemical impedance spectroscopy of concrete cylinder specimens numbered 4 and 7;
[0022] FIG. 4 shows the electrochemical impedance spectroscopy of concrete cylinder specimens numbered 5 and 8;
[0023] FIG. 5 shows the electrochemical impedance spectroscopy of concrete cylinder specimens numbered 6 and 9.
[0024] The technical solution in the embodiment of the present invention will be clearly and completely described in connection with the embodiment of the present invention. It is obvious that the described embodiment is only a part of the embodiments of the present invention and not all of the embodiments.
[0025] The present invention provides a conductive structural adhesive for
reinforcement of concrete structure, comprising: a component A and a component B, wherein the component A comprises following raw materials in parts by a weight: from 80 to 120 parts of epoxy resin, from 25 to 35 parts of activated phosphorus flake graphite, from 5 to 10 parts of ethanol and from 1 to 3 parts of dispersant;
[0026] the component B comprises from 10 to 15 parts of curing agent;
[0027] the epoxy resin is bisphenol A type epoxy resin;
[0028] the dispersant is polyvinyl pyrrolidone;
[0029] the curing agent is triethanolamine; and
[0030] a particle size of the activated phosphorus flake graphite is from 10 to 44 m.
[0031] In some embodiments, a preparation method of the activated phosphorus flake graphite is: putting flake graphite in sodium hydroxide solution with a mass concentration of 5% to 15%, heating at 90° C to 1000 C for 8 minutes to 15 minutes, and cooling to a room temperature, filtering, and washing to neutral; then putting the flake graphite in nitric acid solution with the mass concentration of 5% to 15%, heating at 90°C to 100°C for 8 minutes to minutes, cooling to the room temperature, filtering, washing to neutral, and drying to obtain the activated phosphorus flake graphite.
[0032] Based on the same invention concept, the present invention provides a preparation method of the conductive structural adhesive for reinforcement of concrete structure, comprising following steps:
[0033] mixing the epoxy resin and the ethanol and then pouring mixed solution into a ultrasonic vibrator and keeping ultrasonic vibration for 5 minutes to 15 minutes, then adding the activated phosphorus flake graphite and the dispersant to continue the ultrasonic vibration for 10 minutes to 20 minutes, and then adding the curing agent to continue the ultrasonic vibration for 5 minutes to 10 minutes, so as to obtain the conductive structural adhesive for reinforcement of concrete structure.
[0034] The tensile strength of the conductive structural adhesive for reinforcement of concrete structure of the present invention meets the bonding strength of engineering structure reinforcement: according to GB50728-2011 Code for Application Safety Evaluation of EngineeringStructuralReinforcement Materials, in case where the structural adhesive takes the concrete as the base material and the adhesive fiber as the composite material, the tensile strength should be > 38 MPa, the flexural strength should be > 50 MPa, and the compressive strength should be > 70 MPa. The volume resistivity of the conductive structural adhesive for reinforcement of concrete structure of the present invention is less than 1-cm, which meets the requirements of a conductive coating layer anode for cathodic protection.
[0035] Specifically, the specific usage of the conductive structural adhesive for reinforcement of concrete structure of the present invention is:
[0036] SI: cleaning the bonding surface of the part to be reinforced with cleaning agent Dynatex49665 to remove oil, dirt and dust, and the cleaning width shall be greater than the bonding construction width;
[0037] S2: polishing the cleaned surface mechanically (file, sand paper, etc. can be used), after roughening, the adhesive parts with the highest strength and the best durability can be obtained, and after polishing, cleaning the surface for the second time;
[0038] S3: immediately splicing and clamping the bonded part after applying the conductive structural adhesive for reinforcement of concrete structure, and rolling roller brush with uniform contact pressure to ensure the best curing of bonded part, so as to ensure the conductive structural adhesive is completely soaked in carbon fiber cloth and eliminating defects such as bubbles and bulges. Avoid the construction under the environment with the temperature below 10°C. Generally, the conductive structural adhesive for reinforcement of concrete structure can be cured naturally above 10°C; If it is cured at 120°C, the bonding strength can be greatly improved (the maximum bonding strength can be obtained after curing for 150min).
[0039] The preparation method and application of the conductive structural adhesive for reinforcement of concrete structure of the present invention will be further described with specific embodiment.
[0040] Embodiment 1
[0041] The preparation method of the conductive structural adhesive for reinforcement of concrete structure according to claim 1, comprising following steps:
[0042] SI: putting flake graphite in sodium hydroxide solution with a mass concentration of 10%, heating at 100°C for 10 minutes, and cooling to a room temperature, filtering, and washing to neutral; then putting the flake graphite in nitric acid solution with the mass concentration of 10%, heating at 100°C for 10 minutes to minutes, cooling to the room temperature, filtering, washing to neutral, and finally drying in vacuum at 120°C to activate flake graphite and then obtaining the activated phosphorus flake graphite.
[0043] S2: in part by weight, mixing the 100 parts of bisphenol A type epoxy resin and 7 parts of ethanol and then pouring mixed solution into a ultrasonic vibrator and keeping ultrasonic vibration for 10 minutes, then adding 30 parts of activated phosphorus flake graphite and 2 parts of dispersant polyvinyl pyrrolidone to continue the ultrasonic vibration for 15 minutes, and finally adding 14 parts of curing agent triethanolamine to continue the ultrasonic vibration for 5 minutes, so as to obtain the conductive structural adhesive for reinforcement of concrete structure.
[0044] Performance test:
[0045] the surface topography of the conductive structural adhesive for reinforcement of concrete structure prepared in Embodiment 1 is shown in FIG. 1.
[0046] As can be seen from FIG. 1, the conductive structural adhesive for reinforcement of concrete structure prepared according to the present invention has good dispersibility of flake graphite in the matrix, and the flake graphite crystals are lapped continuously, so the current conduction can be realized.
[0047] Fabricating 9 Self-compacting concrete cylinders with 150 mm in diameter and 310 mm in height and numbering as NO. I to NO. 9; after the concrete cylinders are cured for 28 days, the corroded reinforced concrete columns can be obtained by accelerating the corrosion of steel bars with the constant current method. The results are shown in Table 1 below.
[0048] Table 1 Corrosion of Concrete Cylinders of Different Numbers
CFRP Cathodic NO. reinforcement protection corroso rate currodenity _______ yes or no yes or no 1 no no 1% 0.183pA-cm 2 no no 3% 0.450 A-cm 3 no no 6% 10.406 A-cm 4 yes no 1% 0.115 A-cm 5 yes no 3% 0.289pA-cm 6 yes no 6% 5.327jA-cm 7 yes yes 1% 0.165pA-cm 8 yes yes 3% 0.204pA-cm 9 yes yes 6% 2.933jA-cm
[0049] Before using the conductive structural adhesive for reinforcement of concrete structure in Embodiment 1 to bond with the carbon fiber cloth: firstly, cleaning the adhesive surface with cleaning agent Dynatex4966, roughing with grinding wheel grinding machine and then cleaning again, and then uniformly painting the conductive structural adhesive on the column body with a roller brush, pasting a layer of carbon fiber cloth along the column body of concrete cylinder test pieces with NO. 4 to NO. 9 respectively, applying a thin layer of the conductive structural adhesive for reinforcement of concrete structure uniformly, and finally rolling the roller to brush the carbon fiber cloth against the surface of the test piece to ensure that the conductive structural adhesive for reinforcement of concrete structure is completely soaked in the fiber cloth. The fabricated test pieces is shown in FIG. 2.
[0050] The forced current cathodic polarization method is adopted to protect the concrete cylinder specimens with NO. 7 to NO. 9. Reinforced concrete impressed current cathodic protection system consists of CS310 single channel electrochemical workstation, auxiliary anode and electrode cable; where in: the auxiliary anode is composed of a main anode and a secondary anode, and the main anode is carbon fiber cloth, which is used to connect the DC cable of the power supply to the secondary anode and distribute the cathodic protection current to the secondary anode. The secondary anode is the conductive structural adhesive for reinforcement of concrete structure, and the function of the conductive structural adhesive for reinforcement of concrete structure is to transfer the cathodic protection current directly from the main anode to the paint film, and then distribute it uniformly to the surface of the concrete column.
[0051] After a one-year dry-wet cycle, the electrochemical tests are carried out, and the results are shown in FIG. 3 to FIG. 5. In FIG. 3, Embodiment 4 corresponds to a concrete cylinder specimen NO. 4 and Embodiment 7 corresponds to a concrete cylinder specimen NO. 7; in FIG. 4, Embodiment 5 corresponds to a concrete cylinder specimen NO. 5 and Embodiment 8 corresponds to a concrete cylinder specimen NO. 8; and in FIG. 5, Embodiment 6 corresponds to a concrete cylinder specimen NO. 6 and Embodiment 9 corresponds to a concrete cylinder specimen NO. 9.
[0052] According to the comparison of electrochemical impedance spectra before and after cathodic protection in FIG. 3 to FIG. 5, the charge transfer resistance of corroded reinforced concrete column under the action of cathodic polarization current increases, the corrosion current density decreases and the corrosion condition of reinforced and concrete interface is effectively improved, showing that the conductive structural adhesive for reinforcement of concrete structure can transfer and disperse cathodic protection current well, and meet the requirements of cathodic protection.
[0053] After the electrochemical test, concrete cylinder specimens NO. 4 to NO. 6 compared with unreinforced concrete cylinder specimens NO. 1 to NO. 3, the ultimate bond stress between steel bars and concrete is significantly increased, and the failure of specimens is changed from brittle splitting failure to ductile steel bar pull-out failure, which is mainly because the restraining effect of fiber-reinforced polymer on the lateral deformation of concrete ensures that the protective layer of concrete will not crack, and significantly improves the bond property between the reinforcement and the concrete. The results show that the conductive structural adhesive for reinforcement of concrete structure can be used as the structural adhesive to reinforce the concrete structure bonding with carbon fiber cloth, which can meet the strength requirements of engineering structural reinforcement.
[0054] The above-mentioned embodiments are only preferred embodiments of the present invention, and cannot be used to limit the scope of rights of the present invention. And any modifications, equivalent changes, improvements, etc. made according to the scope of the present invention still belong to the protection scope of the present invention
Claims (5)
- What is claimed is: 1. A conductive structural adhesive for reinforcement of concrete structure,comprising: a component A and a component B, wherein the component A comprises following raw materials in parts by a weight: from 80 to 120 parts of epoxy resin, from 25 to 35 parts of activated phosphorus flake graphite, from 5 to 10 parts of ethanol and from 1 to 3 parts of dispersant; the component B comprises from 10 to 15 parts of curing agent; the epoxy resin is bisphenol A type epoxy resin; the dispersant is polyvinyl pyrrolidone; the curing agent is triethanolamine; and a particle size of the activated phosphorus flake graphite is from 10 to 44 m.
- 2. The conductive structural adhesive for reinforcement of concrete structure according to claim 1, comprising: a preparation method of the activated phosphorus flake graphite is: putting flake graphite in sodium hydroxide solution with a mass concentration of 5% to 15%, heating at 90° C to 1000 C for 8 minutes to 15 minutes, and cooling to a room temperature, filtering, and washing to neutral; then putting the flake graphite in nitric acid solution with the mass concentration of 5% to 15%, heating at 90°C to 100°C for 8 minutes to minutes, cooling to the room temperature, filtering, washing to neutral, and drying to obtain the activated phosphorus flake graphite.
- 3. A preparation method of the conductive structural adhesive for reinforcement of concrete structure according to claim 1, comprising following steps: mixing the epoxy resin and the ethanol, adding the activated phosphorus flake graphite and the dispersant, and adding the curing agent to obtain the conductive structural adhesive for reinforcement of concrete structure.
- 4. The preparation method of the conductive structural adhesive for reinforcement of concrete structure according to claim 3, comprising: mixing the epoxy resin and the ethanol and then pouring mixed solution into a ultrasonic vibrator and keeping ultrasonic vibration for 5 minutes to 15 minutes, then adding the activated phosphorus flake graphite and the dispersant to continue the ultrasonic vibration for 10 minutes to 20 minutes, and then adding the curing agent to continue the ultrasonic vibration for 5 minutes to 10 minutes, so as to obtain the conductive structural adhesive for reinforcement of concrete structure.
- 5. An application of the conductive structural adhesive for reinforcement of concrete structure, comprising: the conductive structural adhesive for reinforcement of concrete structure is used as bonding adhesive for engineering structure and secondary anode for cathodic protection.
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