CN106830726A - A kind of impressed current anode composite and preparation method thereof - Google Patents
A kind of impressed current anode composite and preparation method thereof Download PDFInfo
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- CN106830726A CN106830726A CN201710040254.XA CN201710040254A CN106830726A CN 106830726 A CN106830726 A CN 106830726A CN 201710040254 A CN201710040254 A CN 201710040254A CN 106830726 A CN106830726 A CN 106830726A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
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Abstract
The invention provides a kind of impressed current anode composite and preparation method thereof, the impressed current anode composite includes at least one of which CFRP sheet materials and alkali-activated carbonatite Binder Materials, the CFRP sheet materials are mixed in the alkali-activated carbonatite Binder Materials, and the alkali-activated carbonatite Binder Materials is mixed by industrial residue and alkali-activator；The impressed current anode composite is applied to play a part of reinforced concrete structure in concrete reinforcement structure, can also play obvious protective action to the corrosion of inside concrete reinforcing bar, and impressed current anode of the invention also has the advantages that simple installation, area coverage be big, homogeneous current distribution.
Description
Technical field
The present invention relates to field of civil engineering, more particularly to a kind of impressed current anode composite and preparation method thereof.
Background technology
Reinforced concrete structure is topmost structure type in civil engineering, and its security develops in a healthy way with national economy
It is closely related.However, with the increase and the change of use environment of service life, the deterioration of reinforced concrete structure and function are lost
Effect is more universal and serious, causes concern of the scientific research scholar to concrete structure durability problem.In brief, reinforced concrete
It is long-term to keep intensity and complete appearance under the durability of soil structure refers to concrete various failure conditions in actual use
Ability.
From from the perspective of materialogy, the main reason of reinforced concrete structure durability deterioration is the rust of internal reinforcing bar
Erosion；Reinforcing bar is studied more ripe in the Corrosion mechanism of inside concrete, and under normal circumstances, reinforcing bar is about 13 coagulation in pH value
Passivating film can be formed in native internal hole solution, this tunic can provide enough protections under conditions of excellent to reinforcing bar to be made
It is from corrosion；But when external corrosive medium enters into rebar surface through porous concrete, passivating film is destroyed
And the protection to reinforcing bar is lost, so as to cause the corrosion of reinforcing bar.
At present, concrete is self-contained or chlorion of outside intrusion is considered as cause corrosion of reinforcing steel bar main
Reason.The means for suppressing steel bar corrosion are a lot, for example, apply anticorrosive coat and corrosion inhibiter etc., wherein impressed current cathodic protection technology
One of most efficient method is had proved to be, in some cases even unique solution.Impressed current cathodic protection
Technology is put forward based on pH- potential diagram principles, and reinforcing bar current potential Luo Mianshi areas are made by applying cathode current to reinforcing bar,
And then reach the purpose of protection reinforcing bar.Impressed current anode is the important component of impressed current cathodic protection system, most normal at present
It is mixed-metal oxides Ni―Ti anode, but its expensive price greatly limit its promotion and application.
From from the perspective of structure design, concrete structure durability deterioration is embodied in the bad of element mechanics performance
Change.Therefore scholars conduct extensive research, using steel plate and fiber-reinforced polymer (Fiber Reinforced
Polymer, abbreviation FRP) etc. structure enhancing and reinforcement material, it is proposed that the various structures such as increasing section and paste outside reinforce skill
Art, and have application to engineering practice.Structural reinforcing material is generally total to by Binder Materials (such as epoxy resin) with concrete structure
With load action is undertaken, the additional protective layers of concrete structure are can be considered, and it is internal in isolation external environment condition medium to a certain degree
The erosion of portion's structure.But the deterioration and loss of reinforcement material all can during the defect of construction technology and error, structure military service
This protective layer is destroyed, causes the anticaustic of concrete structure.Importantly, structural strengthening technology cannot solve concrete
Continuation of the internal harmful element (chloride and sulfate such as in sea sand concrete) to reinforcing bar is corroded；It is existing in Practical Project
Many structures are reinforced more than once, often occur repairing repeatly bad situation repeatly.
Therefore, generally required in engineering practice while carry out structural strengthening and cathodic protection, to reach what is treated both principal and secondary aspect of disease
Structure repair and consolidation effect.However, structure and cathodic protection adhere to different technical fields separately, each possess independent design reason
By and implementation.Most of engineerings need to consider alone to reinforce and cathodic protection structure respectively when being repaired, this
High financial burden certainly will be caused to owner.Up to now, prior art also can not find a kind of suitable engineering material,
And go to realize the reinforcing and cathodic protection to concrete structure simultaneously using same technique.
Therefore, prior art has yet to be improved and developed.
The content of the invention
In view of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of impressed current anode composite and its system
Preparation Method, it is intended to which solving prior art cannot realize by a kind of engineering material and using a kind of technique while realizing concrete
Structural strengthening and the problem of cathodic protection.
Technical scheme is as follows：
A kind of impressed current anode composite, wherein, including at least one of which CFRP sheet materials and alkali-activated carbonatite Binder Materials, it is described
CFRP sheet materials are mixed in the alkali-activated carbonatite Binder Materials, and the alkali-activated carbonatite Binder Materials is mixed by industrial residue and alkali-activator
Conjunction is formed.
It is preferred that described impressed current anode composite, wherein, by weight percentage, the alkali-activated carbonatite Binder Materials
Including：0~3 part of 50~100 parts of miberal powder, 12 parts of waterglass, 40 parts of water, 0~50 part of flyash and magnesia.
It is preferred that described impressed current anode composite, wherein, by mass percentage, the flyash includes：
49.9% SiO2, 27.0% Al2O3, 14.0% Fe2O3And 2.7% CaO.
It is preferred that described impressed current anode composite, wherein, the waterglass is by KP1 and NaOH allotment systems
Into the modulus of the KP1 is 2.72.
It is preferred that described impressed current anode composite, wherein, the modulus of the waterglass is 1.
It is preferred that described impressed current anode composite, wherein, the magnesia is solid powdery, the magnesia
Mass fraction >=96.0%.
It is preferred that described impressed current anode composite, wherein, the CFRP sheet materials are grid cloth-like.
It is preferred that described impressed current anode composite, wherein, the thickness of the CFRP sheet materials is 0.1~0.2mm.
A kind of preparation method of impressed current anode composite, wherein, including step：
A, the alkali-activated carbonatite Binder Materials that will be prepared in advance are poured into slot type receptacles；
B, by the infiltration of CFRP sheet materials in the alkali-activated carbonatite Binder Materials, and smash the pre- timing of CFRP sheet materials with roller pestle
Between；
C, the CFPR sheet materials are taken out and are attached to the concrete surface polished, surface tool is obtained after room temperature maintenance
There is the concrete structure of impressed current anode composite.
It is preferred that the preparation method of described impressed current anode composite, wherein, the scheduled time is 5~15min.
Beneficial effect：The invention discloses one kind based on CFRP, alkali-activated carbonatite Binder Materials is made for binding agent
Impressed current anode composite, the impressed current anode composite is applied to be played in concrete reinforcement structure plus
Gu the effect of concrete structure, additionally it is possible to which obvious protective action, and the present invention are played in the corrosion to inside concrete reinforcing bar
Impressed current anode also have the advantages that simple installation, area coverage be big, homogeneous current distribution.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the preparation method preferred embodiment of impressed current anode composite of the invention.
Specific embodiment
The present invention provides a kind of impressed current anode composite and preparation method thereof, to make the purpose of the present invention, technical scheme
And effect is clearer, clear and definite, the present invention is described in more detail below.It should be appreciated that specific implementation described herein
Example is only used to explain the present invention, is not intended to limit the present invention.
The present invention provides a kind of impressed current anode composite, wherein, including at least one of which CFRP sheet materials and alkali-activated carbonatite gelling
Material, the CFRP sheet materials are mixed in the alkali-activated carbonatite Binder Materials, and the alkali-activated carbonatite Binder Materials is by industrial residue and alkali
Property exciting agent is mixed.
Specifically, the present invention is gelled using carbon fibre reinforced composite (CFRP) as impressed current anode with alkali-activated carbonatite
Material is fixed up as binding agent with concrete reinforcement structural outer surface, being capable of the large area covering concrete reinforcement knot
Structure；Compared with the impressed current anode that prior art is commonly used, the impressed current anode composite that the present invention is provided has easy for installation, covering
Area is big, the advantage of homogeneous current distribution；And impressed current anode composite of the invention is applied to concrete reinforcement structure
In can not only play a part of reinforced concrete bar construction, additionally it is possible to the corrosion to inside concrete reinforcing bar is played significantly
Protective action.
Based on the problem that prior art is present, this invention address that a kind of suitable engineering material is researched and developed, using same
Technique strives for that reduces cost, labour and time can be made every effort to while realize the reinforcing and cathodic protection of concrete reinforcement structure.Base
In above-mentioned thinking, the composition of integrated structure reinforcement system of the present invention and impressed current cathodic protection system, discovery between the two may be used
The cross section that can exist is the reinforcement material of structural strengthening system and the impressed current anode of impressed current cathodic protection system.This meaning
Taste, once have developed one kind disclosure satisfy that good mechanical properties, the material of impressed current anode requirement is met again, it is possible to same
The reinforcing and cathodic protection of Shi Shixian concrete reinforcement structures.
The consideration of mechanical property and electrochemical properties based on material, the present invention analysis and compare various reinforcement materials and
Auxiliary anode material, finally found that carbon fibre reinforced composite (CFRP materials) not only possesses good mechanical property, and
Carbon fiber guiding as main component is electrically good, electrochemical properties of the electrode potential close to noble metal.
But want the tie for enabling CFRP materials to turn into attachment structure reinforcing and the big field of cathodic protection two, it is necessary to first solve
Certainly CFRP materials as impressed current anode feasibility problems.
To solve feasibility problems of the CFRP materials as impressed current anode, CFRP sheet layers are mixed in alkali-activated carbonatite by the present invention
CFRP- alkali-activated carbonatite latex composite materials are can be prepared by Binder Materials, the CFRP- alkali-activated carbonatites latex composite material is pasted
On the surface of concrete, as impressed current anode.
Wherein, the CFRP sheet materials can be one or more layers, and preferably described CFRP sheet materials are grid cloth-like, and described
The thickness of CFRP sheet materials is 0.1~0.2mm (preferably 0.167mm)；
Specifically, the main mechanical index of CFRP sheet materials used in the present invention is as shown in table 1：
| Mass area ratio | g/m2 | 300 |
| Nominal thickness | mm | 0.167 |
| Tensile strength standard value | MPa | 3389 |
| Elastic modelling quantity | GPa | 269 |
| Fault growth rate | % | 1.8 |
| Bending strength | MPa | 712 |
| Interlaminar shear strength | MPa | 48 |
| Adhesion strength is just drawn with concrete | MPa | 2.6 |
Wherein, the alkali-activated carbonatite Binder Materials is mixed by industrial residue and alkali-activator, and specifically, the alkali swashs
Hair jelly gel material includes：0~3 part of 50~100 parts of miberal powder, 12 parts of waterglass, 40 parts of water, 0~50 part of flyash and magnesia；
As shown in table 2, table 2 is alkali-activated carbonatite Binder Materials prepared by different component proportioning：
Further, in the alkali-activated carbonatite Binder Materials, the flyash includes by mass percentage：49.9%
SiO2, 27.0% Al2O3, 14.0% Fe2O3And 2.7% CaO, belong to low calcium type flyash；The magnesia is solid
Body is powdered, mass fraction >=96.0% of the magnesia.
Further, the waterglass used in the present invention is made up of KP1 and NaOH allotments, the KP1
Modulus is 2.72, mass fraction >=96.0% of NaOH (analysis is pure) used, is provided by western Gansu Province chemical industry；Waterglass after modulation
Modulus is 1, and modulus of water glass is the molecular proportion (or mol ratio) of silica in waterglass and alkali metal oxide；Waterglass mould
Number is the important parameter of waterglass, and typically between 1.5-3.5, modulus of water glass is bigger, and solid water glass is got over and is insoluble in water, n
For 1 when normal-temperature water can dissolve, n needs the hot water could to dissolve when increasing, and n needs the steam more than 4 atmospheric pressure could be molten when being more than 3
Solution, modulus of water glass is bigger, and silica content is more, the increase of waterglass viscosity, it is easy to decompose hardening, cohesive force increase；In order to
The waterglass in the present invention is set to be easy to dissolving, the modulus of preferably described waterglass is 1.
The alkali-activated carbonatite Binder Materials that impressed current anode composite of the present invention is used has good adhesion strength and Nai Gao
Warm ability, the CFRP reinforcing materials bonded by it collective effect together, rupture strength and the impact that can effectively improve product is tough
Property.
Based on above-mentioned impressed current anode composite, the present invention also provides a kind of preparation method of impressed current anode composite,
Wherein, as shown in figure 1, including step：
S1, the alkali-activated carbonatite Binder Materials that will be prepared in advance are poured into slot type receptacles；
S2, by CFRP sheet materials infiltration in the alkali-activated carbonatite Binder Materials, and with roller pestle smash the CFRP sheet materials make a reservation for
Time；
S3, the CFPR sheet materials are taken out and are attached to the concrete surface polished, surface is obtained after room temperature maintenance
Concrete structure with impressed current anode composite.
Further, the scheduled time is 5~15min, preferably 10min, by the way that with roller, pestle smashes CFRP sheet materials back and forth
10mim, can effectively reduce the transition region porosity between adhesive and carbon cloth, make transition region finer and close, fill up whole
Fibrous mesh cloth.
When the present invention is repaired using CFRP- alkali-activated carbonatites latex composite material to concrete reinforcement structure, CFRP materials
On the one hand it is used as reinforcement material and the common stress of Structural Engineering, improves the mechanical property of concrete reinforcement structure；On the other hand make
For impressed current anode imposes impressed current cathodic protection to structure so as to protection structure.
Specifically, the CFRP- alkali-activated carbonatites latex composite material is pasted onto into concrete reinforcement body structure surface is carried out to it
The experimental procedure of reparation is as follows：
(1) concrete surface is polished dabbing, removes the impurity such as skim-coat dust；Then a small amount of water is spilt in concrete surface,
Impurity is wiped with wet rag, and keeps concrete surface to moisten, this way avoids dry concrete surface and draws alkali-activated carbonatite
Binder Materials internal moisture, can make concrete have preferably bonding with alkali-activated carbonatite Binder Materials；
(2) CFRP grid cloths are cut according to specification；
(3) required bonded areas 100mm × 100mm is drawn in concrete surface, so as to accurately by CFRP grid cloths
It is pasted onto designated area；
(4) the alkali-activated carbonatite Binder Materials that will be stirred is poured into slot type receptacles, carbon is infiltrated in alkali-activated carbonatite Binder Materials fine
Dimension grid cloth (CFRP grid cloths), and pestle smashes CFRP grid cloths 10 minutes back and forth with roller, by with alkali-activated carbonatite Binder Materials pair
Carbon fiber mesh fabric carries out infiltration and pestle smashes treatment, reduces the transition region porosity between adhesive and carbon cloth, makes transition
Area is finer and close, fills up whole fibrous mesh cloth；
(5) 2mm thickness alkali-activated carbonatite Binder Materials primers are brushed in concrete surface, CFRP grid cloths one is faced down and is pasted onto
Concrete surface；And bubble is extruded with plastic scrapers, 2mm thickness face glue is brushed, after after glue-line final set, with moist sponge and plastics
Film is covered in reinforcing portion faces, and to ensure to reinforce area moist, other drawing regions of carbon fiber mesh fabric have then been coated
Machine glue epoxy resin, and two pieces of organic adhesive curings of carbon cloth are transferred on clamping zone；
(6) after alkali-activated carbonatite Binder Materials supports 7d, taken out of from mould and, carry out normal temperature laboratory maintenance.
The alkali-activated carbonatite stick that CFRP- alkali-activated carbonatites latex composite material of the present invention is used has the resistance to height of good viscous intensity sum
Warm ability, the CFRP reinforcing materials bonded by it collective effect together, improves the rupture strength and impact flexibility of product.This
Outward, traditional organic binder bond such as epoxy resin etc. has the shortcomings that easily aging, the chance water capacity is also easy to produce organic and inorganic interfacial failure,
And inorganic material has more preferable durability, the advantages of producing interfacial failure with concrete is difficult after meeting water.
CFRP- alkali-activated carbonatites latex composite material is positive as the auxiliary of impressed current cathodic protection system (ICCP-SS systems)
Pole, in addition to early stage optimizes inorganic glue and bonding process, in addition it is also necessary to the feasibility applied in systems is met, below by experiment
The feasibility in ICCP-SS systems of the impressed current anode composite that the checking present invention is provided：
1st, CFRP- alkali-activated carbonatites latex composite material and original concrete test block needs to remain preferably viscous before and after being powered
Knot effect；The judgement of bond effect is failure mode, the peels off area by composite in simple shear test and concrete surface layer
And adhesion strength is evaluated.As shown in table 3：1-1,1-2,1-3 represent the simple shear experiment effect before being powered；2-1、2-2、2-
3 represent the simple shear experiment effect after being powered, and from experimental result, CFRP- alkali-activated carbonatites latex composite material is used as ICCP-SS systems
The impressed current anode of system and the sticking effect of concrete preferably, concrete is carried out with composite proposed by the present invention reinforcing be can
Capable.
Table 3 is powered front and rear simple shear experiment effect
2nd, CFRP- alkali-activated carbonatites latex composite material not only needs reinforcement concrete as the impressed current anode of ICCP-SS systems
Structure, and the corrosion of internal reinforcing bar can be played a protective role；Therefore, can CFRP- alkali-activated carbonatites latex composite material conduct
Impressed current anode protection reinforcing bar is also the requirement that the present invention needs to meet：
Standard armored concrete test specimen is carried out into drying and watering cycle in Nacl solution to process one month, reinforcement corrosion shape is simulated
State, then carries out reinforcement protection using CFRP- alkali-activated carbonatites latex composite material, during conserving, by protective reinforcing bar with it is external
The negative pole of power supply is connected, and CFRP/ alkali-activated carbonatites Binder Materials (AAM) anode is connected with its positive pole；Using data logger (Data
Log it is reference electrode to quilt with 2205 type stainless steels) to being powered voltage monitoring between protective negative electrode and CFRP anodes
When protective is powered, hit when and 4 hours depolarising after potential value be monitored.
For the sign of corrosion conditions of reinforcement, can be analyzed from the angle of thermodynamics and kineticses respectively, i.e., mainly
It is that the corrosion potential and corrosion electric current density of reinforcing bar are estimated.After the present invention is using the test of linear polarization determination method, find
It is more serious by the steel reinforced concrete erosion after drying and watering cycle treatment before being powered.
Except making assessment to cathodic protection effect by the angle from protection potential, Minimum Polarization is also adopted by engineering
The protection criterion of 100mV of decaying judges；According in polarization decay (development) criterion cut-out cathodic protection current 24 hours, polarize
Decay then shows reinforcement corrosion in order not less than 100mV.Through the armored concrete test specimen after corrosion in ICCP-SS systems
Be can be seen that according to its potential change situation in maintenance processes, the corrosion condition of armored concrete is in safe range.
By above-mentioned test result indicate that：Using the CFRP- alkali-activated carbonatite latex composite materials of present invention offer as auxiliary
Anode can play the purpose of protection reinforcing bar, it was demonstrated that CFRP- alkali-activated carbonatites latex composite materials can play its simultaneously as reinforcing
The double duty of material and impressed current anode.That is, being repaired to structure using CFRP- alkali-activated carbonatite latex composite materials
When, on the one hand CFRP- alkali-activated carbonatites latex composite material is used as reinforcement material and the common stress of Structural Engineering, improves the mechanics of structure
Performance；On the other hand impressed current cathodic protection is imposed to structure so as to protection structure as impressed current anode.
So just become the new structural systen of a kind of structural strengthening and cathodic protection after concrete reinforcement structure repair,
The security and durability of concrete reinforcement structure are drastically increased, there is long-term benefit very high.By this CFRP- alkali-activated carbonatites
The double duty of latex composite material is incorporated into FRP- concrete combined structures, material is thus formed band cathodic protection work(
New CFRP-steel-concrete the combined structure system of energy；The new structural systen has tradition FRP- concrete combined structures
Advantage, such as improve mechanical property, without extra construction formwork, good endurance, and due in structure from the beginning
Cathodic protection electric current can be passed through to it, the reinforcement corrosion to structure carries out pro-active intervention, reinforcing bar is polarized and from concrete steel
Muscle surface is outwards driven away harmful corrosive medium, such as chlorion, so as to reach the purpose of protection reinforcing bar.
In sum, the impressed current anode composite that the present invention is provided includes that at least one of which CFRP sheet materials and alkali-activated carbonatite are gelled
Material, the CFRP sheet materials are mixed in the alkali-activated carbonatite Binder Materials, and the alkali-activated carbonatite Binder Materials is by industrial residue and alkali
Property exciting agent is mixed.The impressed current anode composite is applied to play reinforcing in concrete reinforcement structure
The effect of concrete structure, additionally it is possible to which obvious protective action is played in the corrosion to inside concrete reinforcing bar.
It should be appreciated that application of the invention is not limited to above-mentioned citing, and for those of ordinary skills, can
To be improved according to the above description or converted, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Shield scope.
Claims (10)
1. a kind of impressed current anode composite, it is characterised in that including at least one of which CFRP sheet materials and alkali-activated carbonatite Binder Materials, institute
State CFRP sheet materials to be mixed in the alkali-activated carbonatite Binder Materials, the alkali-activated carbonatite Binder Materials is by industrial residue and alkali-activator
Mix.
2. impressed current anode composite according to claim 1, it is characterised in that by weight percentage, the alkali swashs
Hair jelly gel material includes：0~3 part of 50~100 parts of miberal powder, 12 parts of waterglass, 40 parts of water, 0~50 part of flyash and magnesia.
3. impressed current anode composite according to claim 2, it is characterised in that by mass percentage, the fine coal
Ash includes：49.9% SiO2, 27.0% Al2O3, 14.0% Fe2O3And 2.7% CaO.
4. impressed current anode composite according to claim 2, it is characterised in that the waterglass by KP1 and
NaOH allotments are made, and the modulus of the KP1 is 2.72.
5. impressed current anode composite according to claim 2, it is characterised in that the modulus of the waterglass is 1.
6. impressed current anode composite according to claim 2, it is characterised in that the magnesia is solid powdery,
Mass fraction >=96.0% of the magnesia.
7. impressed current anode composite according to claim 1, it is characterised in that the CFRP sheet materials are grid cloth-like.
8. impressed current anode composite according to claim 1, it is characterised in that the thickness of the CFRP sheet materials is 0.1
~0.2mm.
9. a kind of preparation method of impressed current anode composite, it is characterised in that including step：
A, the alkali-activated carbonatite Binder Materials that will be prepared in advance are poured into slot type receptacles；
B, by the infiltration of CFRP sheet materials in the alkali-activated carbonatite Binder Materials, and smash the CFRP sheet materials scheduled time with roller pestle；
C, the CFPR sheet materials are taken out and are attached to the concrete surface polished, be obtained after room temperature maintenance surface have it is auxiliary
The concrete structure of supporing yang pole composite.
10. the preparation method of impressed current anode composite according to claim 9, it is characterised in that the scheduled time
It is 5~15min.
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| WO2014141051A1 (en) * | 2013-03-14 | 2014-09-18 | The Catholic University Of America | High-strength geopolymer composite cellular concrete |
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