LU102505B1 - Carbon fiber-doped conductive cement-based material, preparation method and application thereof - Google Patents
Carbon fiber-doped conductive cement-based material, preparation method and application thereof Download PDFInfo
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- LU102505B1 LU102505B1 LU102505A LU102505A LU102505B1 LU 102505 B1 LU102505 B1 LU 102505B1 LU 102505 A LU102505 A LU 102505A LU 102505 A LU102505 A LU 102505A LU 102505 B1 LU102505 B1 LU 102505B1
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
- B28B1/087—Producing shaped prefabricated articles from the material by vibrating or jolting by means acting on the mould ; Fixation thereof to the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/29—Producing shaped prefabricated articles from the material by profiling or strickling the material in open moulds or on moulding surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/0062—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects forcing the elements into the cast material, e.g. hooks into cast concrete
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
- B28C5/402—Methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
- B28C5/404—Pre-treatment of fibres
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0003—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability making use of electric or wave energy or particle radiation
- C04B40/0007—Electric, magnetic or electromagnetic fields
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/26—Corrosion of reinforcement resistance
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/90—Electrical properties
- C04B2111/94—Electrically conducting materials
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Abstract
The present invention provides a carbon fiber-doped conductive cement-based material. The conductive cement-based material includes a mixture of the following components by weight: 85-90 parts of cement. 125-200 parts of sand. 10-15 parts of ore powder, 1-3 parts of redispersible latex powder,40-50 parts of water. 0.5-0.8 parts of water reducing agent.0.03-0.06 parts of defoamer: and carbon fiber, the volume of carbon fiber accounts for 0.6-1% of the volume of the above mixture. The conductive cement-based material has the properties of early strength and quick hardening, which is suitable for repairing projects; it has higher durability, higher toughness and lower resistivity, which effectively reduces the shrinkage of cement-based materials; it has the functions of repairing and conducting electricity, and has broad development prospects in the field of electrochemical dechlorination.
Description
B1.-5201 LU102505 CARBON FIBER-DOPED CONDUCTIVE CEMENT-BASED MATERIAL,
BACKGROUND Field of Invention The present invention belongs to the technical field of cement-based composite materials. and specifically relates to a conductive cement-based material. as well as a preparation method and application thereof.
Background of the Invention Under the effect of external environmental conditions. some buildings will be damaged by erosion. which will affect their service life. Buildings are generally reinforced concrete structures. Corrosion of the reinforced concrete structure will have a huge impact on the structure and performance of the reinforced concrete structure. For the corroded reinforced concrete. impressed current cathodic protection 1s one of the most effective protective measures. In the cathodic protection system. the selection of anode materials is the most critical technology. For the reinforced concrete system contaminated by chloride salts (chlorine salts). in order to improve the efficiency of cathodic protection, the anode materials with excellent performance coated on the concrete surface need to meet the following basic requirements: (1) clectronic conduction. low resistivity, providing the required protection current: (2) electrochemical inertness to ensure a long service life: (3) excellent mechanical properties. higher adhesion strength especially with base concrete. and better toughness.
At present. the existing anode materials. titanium-based anode electrode strengthening life is long. but the cost is too high: conductive coating anodes will be damaged in the case of dry and wet alternating. cold and hot cycling. ultraviolet exposuring. as well as severe chloride salt corrosion or excessive current density. The conductive cement-based material can repair damaged structures while using its conductive properties for structural monitoring and evaluation. which has excellent using performance. However. conductive fiflers such as
BL-5201 LU102505 graphite. carbon black, and carbon fiber added to the conductive cement-based materials are not casily dispersed in the cement-based materials, which affects the performance of conductive cement-based materials. For buildings that need to repair concrete surface damage, the anode material is also required to have carly strength and carly hardening, while the silicate cement used in ordinary cement base is not casy to construct and has a long solidification time for repairing, which is not conducive to emergency repairing and restricts its application.
Therefore, it is necessary to provide an improved technical solution for the above- mentioned shortcomings of the prior art.
SUMMARY The purpose of the present invention is to provide a carbon fiber-doped conductive cement-based material, as well as a preparation method and application thereof. so as to solve the problems that the fillers of the traditional conductive cement-based material are difficult to be dispersed, the conductive cement base has low mechanical properties, the repairing function is lacking. to provide a conductive cement-based material with excellent conductivity, mechanical properties and durability.
In order to achieve the above purpose. the present invention provides the following technical solutions.
A carbon fiber-doped conductive cement-based material, the conductive cement-based material includes a mixture of the following components by weight: 85-90 parts of cement, 125-200 parts of sand, 10-15 parts of ore powder. 1-3 parts of redispersible latex powder, 40-50 parts of water. 0.5-0.8 parts of water reducing agent.0.03-
0.06 parts of defoamer:; and carbon fiber. the volume of carbon fiber accounts for 0.6-1% of the volume of the above mixture: the conductive cement-based material further includes a dispersant. the mass of the mixed dispersant is 0.4-0.6% of a mass of gel material. and the mass of the gel material is the mass
BL-5201 LU102505 sum of the cement and the ore powder.
BRIEF DESCRIPTION OF THE DRAWINGS The specification drawings constituting a part of the present application arc used to provide a further understanding of the present invention. The exemplary examples and descriptions of the present invention are used to explain the present invention, and do not constitute an improper definition to the present invention. Wherein.
Fig.l is a schematic diagram of a four-electrode method for testing the resistivity of conductive cement-based material of Example ! of the present invention: Fig.2 is a resistivity diagram of the conductive cement-based materials obtained by mixing with different contents of carbon fiber in Experiment 1 of the present invention.
DETAILED DESCRIPTION OF THE EMBODYMENTS The technical solutions in the examples of the present invention will be described clearly and completely below. Obviously. the described examples are only part of the examples of the present invention, rather than all the examples. Based on the examples in the present invention. other examples which are obtained by those skilled in the art all fall within the protection scope of the present invention.
The present invention provides a carbon fiber-doped conductive cement-based material. as well as a preparation method and application thereof. The carbon fiber-doped conductive cement-based material is applied to the clectrochemical dechlorination of corroded reinforced concrete. The filler carbon fiber is added to the conductive cement-based material. The carbon fiber has high strength. corrosion resistance and excellent conductive performance. After the carbon fiber is added to cement, it can improve the mechanical properties of the cement-based materials. increase toughness. and reduce drying shrinkage. The present invention selects an appropriate size of carbon fiber and dispersant. as well as a reasonable dispersion process. which can make the carbon fiber easier to form a conductive network in the cement base. The
BI.-5201 LU102505 cement used in the present invention is sulphate aluminium cement. Compared with ordinary silicate cement, the sulphate aluminium cement has the advantages of shorter setting time and higher carly strength. which is more suitable for use as repairing materials for some projects. At the same time. in order to improve the performance of sulphate aluminium cement-based materials in the present invention. the sulphate aluminium cement is modified by adding redispersible latex powder to the sulphate aluminium cement. which improves the construction conditions of sulphate aluminium cement-based materials, makes them more convenient and efficient. and improves their toughness, bonding strength and durability.
The present invention combines the modified sulphate aluminium cement-based material with the well-dispersed carbon fiber to prepare a new type of conductive cement-based material. This material overcomes the disadvantage that the traditional conductive fillers have a high content and difficult dispersion in cement-based materials. The present invention can make it have excellent conductive performance by adding a small amount of dispersed carbon fiber. Mcanwhile. the conductive cement-based material of the present invention uses sulphate aluminium cement. which is easier to construct than ordinary silicate cement. The early strength is high. the setting time is short. and the adhesion to the concrete matrix is good. which are good for emergency repairing. The conductive cement-based material prepared by the present invention has a good conductive effect, excellent mechanical properties and durability. which can be used for a long time. and has broad development and application prospects in the fields such as clectrochemical desalination. steel corrosion monitoring.
The present invention provides a carbon fiber-doped conductive cement-based material. the conductive cement-based material includes a mixture of the following components by weight: 85-90 parts (such as 86 parts. 87 parts. 88 parts. 89 parts. 89.5 parts) of cement. 125-200 parts (such as 130 parts. 135 parts. 140 parts. 145 parts. 150 parts, 155 parts. 160 parts. 165 parts. 170 parts. 175 parts. 180 parts. 185 parts. 190 parts. 195 parts) of sand. 10-15 parts (such as 10.5 parts, 11 parts, 12 parts. 13 parts. 14 parts. 15 parts) of ore powder. 1-3 parts (such as
31.-3201 LU102505
1.5 parts. 2 parts. 2.5 parts. 3 parts) of redispersible latex powder,40-50 parts (such as 41 parts. 42 parts. 43 parts, 44 parts, 45 parts. 46 parts, 47 parts, 48 parts, 49 parts) of water. 0.5-0.8 parts (such as 0.6 parts, 0.7 parts, 0.8 parts) of water reducing agent,0.05-0.06 parts (such as 0.04 parts, 0.05 parts. 0.06 parts) of defoamer: and carbon fiber, the volume of carbon fiber accounts for 0.6-1% (such as 0.65%. 0.7%.
0.75%, 0.8%. 0.85%. 0.9%) of the volume of the above mixture: Preferably. the conductive cement-based material further includes a dispersant. the mass of the mixed dispersant is 0.4-0.6% (such as 0.45%. 0.53%. 0.35%. 0.6%) of a mass of gel material. and the mass of the gel material is the mass sum of the cement and the ore powder.
In the specific example of the present invention, the mortar-sand (or known as glue-sand) ratio is 1 :(1.25-2). suchas (1:13. 1:1,35. 114 11,45. HLS. 1:155, 1716, 1:11.65. 1:1,7, 1:11.75, 1:1.8. 1:1.85. 1:1.9. 1:1.95). wherein the mortar-sand ratio is the mass ratio of the total amount of cement and ore powder to the amount of sand: a mixture of cement and ore power is also called as gel material: the water-gel ratio is 0.4-0.5. that is. the ratio of water to the gel material is 0.4-0.5 (such as 0.41. 0.42. 0,43, 0.44, 0.45, 0.46, 0.47. 0.48. 0.49): the redispersible latex powder accounts for 1-3% of the mass of the gel material. the water reducing agent accounts for 0.5-0.8% of the mass of the gel material. and the defoamer accounts for 0.03-0.06% of the mass of the gel material.
Both different water-gel ratio and the content of mixed water reducing agent in the conductive cement-based material will affect the {fluidity of the conductive cement base. thereby affecting the dispersion of carbon fiber in the cement base. and ultimately affecting the formation of its conductive network. The reasonable amount of the mixed dispersant will be more conducive to the dispersion of carbon fiber in the cement based materials.
In the specific examples of the present invention. the length of the carbon fiber is 6-9mm (such as 6.5mm. 7mm. 7.3mm. 8mm. 8.5mm). As the length of carbon fiber is too short. it 1s not easy to overtap to form a conductive network. and as the length of carbon fiber is too long. it is not conducive to its dispersion in the cement base. The chosen carbon fibers with a length
BL-3201 LU102505 of 6-9mm can not only overlap each other to form a better conductive network, but also disperse well in the cement base. resulting in improving the stability of the conductive cement-based material, and reducing the resistivity.
In the specific examples of the present invention, the cement is sulphate aluminium cement.
In the specific examples of the present invention. the redispersible latex powder is ethylene vinyl acetate copolvmer: Preferably. the dispersant ts methyl cellulose; also preferably. the water reducing agent is a water reducing agent of polycarboxylic acid type.
In order to further understand the conductive cement-based material of the present invention. the present invention also provides a preparation method of the carbon fiber-doped conductive cement-based material. The preparation method comprises the following steps.
S1. préparation of a carbon fiber dispersion the weighed carbon fiber is dissolved in water and is dispersed uniformly to obtain a pre- dispersed carbon fiber solution: the dispersant and the defoamer are added to the pre-dispersed carbon fiber solution. dispersed by stirring and ultrasonic to obtain a carbon fiber dispersion: In the specific examples of the present invention, in step S1,the dispersant is added to the pre-dispersed carbon fiber solution, dispersed for 5-13min by stirring and ultrasonic (such as Gmin. 7min. 8min, 9min. 10min. 11min. 12min. 13min. 14min).
Preferably. the water for dissolving the carbon fiber in step SI accounts for 1/3 to 2/3 of the amount of water in the mixture, and more preferably. the water for dissolving the carbon fiber accounts for 1/3 of the amount of water in the mixture.
Preferably. the specific preparation process of the pre-dispersed carbon fiber solution in step ST is that the carbon fiber is dissolved in water. and the water is heated 16 65-75°C (such as 66°C. 67°C. 68°C. 69°C. 70°C. 71°C, 72°C. 73°C. 74°C), and ultrasonically dispersed for 5-15 min(such as 6min. 7min. 8min. 9min. 10min. 11min. 12min. 13min. l4min) to obtain the pre-dispersed carbon fiber solution.
S2. preparation of cement-based mortar cement. ore powder. redispersible latex powder. water. and water reducing agent are added
BI-5201 LU102505 into a blender and stirred evenly; then the carbon fiber dispersion obtained in step S1 is added into the blender and continue to be stirred evenly: then sand 1s added into blender. and a cement- based mortar mixture is obtained after mixing evenly: S3. forming of conductive cement-based material the cement-based mortar obtained in step S2 is filled into a die assembly. vibrated and smoothed. and the electrode material is inserted; the die assembly is released after standing for 4-24 hésuch as 5h. 10h. 15h. 17h. 20h, 21h, 22h, 23h, 24h). and a conductive cement-based material is obtained after curing. Preferably. the electrode 1s a copper sheet electrode.
In the specific examples of the present invention. in step S3. the specific curing condition is that curing is performed in a curing room with a temperature of 15-25°C(such as 16°C, 17°C, 18°C. 19°C. 20°C. 21°C. 22°C. 23°C, 24°C) and a relative humidity of =90%.
The conductive cement-based material prepared by the preparation method of the carbon fiber-doped conductive cement-based material of the present invention is applied to the clectrochemical dechlorination of corroded reinforced conerete.
The cement used in the following examples of the present invention 1s the High-Belite sulphate aluminium cement produced by Tangshan Polar Bear Building Materials Co.. Lid. in Hebei province: the carbon fiber is chopped from Japan's Toho glue-free and pulp-free carbon fiber filament. with the specification of 6-9 mm. strength of 4900 Mpa. modulus of 240 Gpa. resistivity of 1.5*107 (.cm, monofilament diameter of 7um: sand is river sand with a fineness modulus of 2.7: the water reducing agent is an efficient water reducing agent of polycarboxylic acid type. which is produced by Hangsu Bote New Material Co.. Ltd.
Example 1 This example provides a preparation method of a carbon fiber-doped conductive cement- based material. including the following steps.
Step S1. 10.82 carbon fiber with the 6mm of length (the content of the mixed carbon fiber is (1.6 % of the volume of the mixture) is put into a 300 ml beaker. and 1342 water heated to
BI.-5201 LU102505 70° C is added, stirring evenly with a glass rod. The beaker ( the resulting product) is put into an ultrasonic cleaner and dispersed ultrasonically for 10 min to obtain a pre-dispersed carbon fiber solution; 3.2g methyl cellulose is weighed. added into the pre-dispersed carbon fiber solution, and stirred evenly with a glass rod, and then 0.24 g defoamer is added with a dropper. and continues to be dispersed ultrasonically for 10 min to obtain a well-dispersed carbon fiber dispersion for use.
Step S2. 720g sulphate aluminium cement, 80g ore powder, and 266g water (the amount of water consumption here is 2/3 of the total amount of water consumption. and the water dissolving the carbon fiber accounts for 1/3 of the total amount of water consumption). 16g redispersible latex powder, 4e water reducing agent are weighed. added into a mortar mixing pot, and stirred at low speed for 30s with a stirring speed of 140 Z 5r/min. Stopping stirring. the dispersed carbon fiber dispersion is added and stirred at low speed for 30s with a stirring speed of 140% 5r/min. And then 1200g sand is added and stirred at low speed for 180s with a stirring speed of 140 + 5r/min.
Step S3. the mixture is poured into a cement mortar triple die assembly, and the cement mortar triple die assembly is placed on the vibrating table. vibrated and smoothed. and the copper electrode is inserted: the dic assembly is released after standing for 12h. The mixture after releasing the dic assembly is moved into a standard curing room with a temperature of 20°C and a relative humidity of 95% for curing.
Performance testing The resistivity test usually has three test methods. multimeter. two-electrode method and four-clectrode method. When using a multimeter to measure the resistivity of cement-based materials. if vou directly use the multimeter to measure the results, there is usually a large deviation. because the contact between the copper sheet and the test block will produce contact resistance. and the measured resistance value is the sum of the contact resistance and the sample resistance. which caused a great error, For the two-electrode method. the resistance of the connecting wire is added 10 the measured resistance value during measurement. thus it 1s often
BL-5201 LU102505 used in the case that the target resistance value 1s small. The four-clectrode method can effectivelv avoid the above-mentioned problems in the test. The four-electrode method adopts an independent current source and an inductance voltage circuit, which can greatly reduce the influence of the circuit impedance on the measured target resistance. Therefore. the resistivity test method adopts the four-electrode method. and the schematic diagram is shown in Fig.l, The wires, power supply. voltmeter. and ammeter are connected according to the schematic diagram. The resistivity calculation is based on the formulas RFU/T. p=RS/L, where S is a cross- sectional arca of the specimen (mm2). and Lis a distance between the two electrodes in the middle.
Using the four-electrode method to test. the resistivity value of the conductive cement- based material prepared in this example is 121.65 Qeem, Example 2 In this example. the mass of carbon fiber in step ST is replaced with 14.4 g (the content of the mixed carbon fiber accounts for 0.8% of the volume of the mixture). and the other method steps are the same as in example 1, which will not be repeated here.
In this example. the same test method as in example | is used. and the resistivity value of the prepared conductive cement-based material is 69.16 Qecm.
Example 3 In this example. the mass of carbon fiber in step S1 is replaced with 18 g (the content of carbon fiber mixed accounts for 1% of the volume of the mixture}. and the other method steps are the same as in example |. which will not be repeated here.
In this example, the same test method as in example 1 is used. and the resistivity value of the prepared conductive cement-based material 1s 49,02 Qeem.
Example 4
BI-5201 LU102505 In this example. the mass of redispersible latex powder in step S2 is replaced with 24 2. and the other method steps are the same as in example 2, which will not be repeated here.
In this example, the same test method as in example 1 is used. and the resistivity value of the prepared conductive cement-based material is 61.27 Qeem, Example 5 In this example. the mass of redispersible latex powder in step S2 is replaced with 8 ©. and the other method steps arc the same as in example 2. which will not be repeated here.
In this example, the same test method as in example 1 is used. and the resistivity value of the prepared conductive cement-based material is 75.87 Qscm.
Example 6 In this example, the carbon fiber with a diameter of 6 mm in step SI is replaced with a carbon fiber with a diameter of 9 mm, and the other method steps are the same as in example 1, which will not be repeated here.
In this example. the same test method as in example 1 is used, and the resistivity value of the prepared conductive cement-based material is 185.24 Qecm, Example 7 In this example. the carbon fiber with a diameter of 6 mm in step SI is replaced with a carbon fiber with a diameter of 9 mm, and the mass of the carbon fiber is 14.42. The other method steps are the same as in example 2. which will not be repeated here.
In this example. the same test method as in example 11s used. and the resistivity value of the prepared conductive cement-based material is 89. 10cm.
Example 8 This example provides a preparing method of a carbon fiber-doped conductive cement-
fl BL-5201 LU102505 based material, including the following steps.
Step S1, 14.4 g carbon fiber (the content of the mixed carbon fiber is 0.8 % of the volume of the mixture) is put into a 500 ml beaker, and 266 g water heated to 65° C is added, stirring evenly with a glass rod. The beaker ( the resulting product) is put into an ultrasonic cleaner and dispersed ultrasonically for 15 min to obtain a pre-dispersed carbon fiber solution: 3.2g methyl cellulose is weighed, added into the pre-dispersed carbon fiber solution, and stirred evenly with a glass rod, and then 0.48 g defoamer is added with a dropper, and continues to be dispersed ultrasonically for 5 min to obtain a well-dispersed carbon fiber dispersion for use.
Step S2, 680 ¢ sulphate aluminium cement, 120 & ore powder, and 134 g water (the amount of water consumption here is 1/3 of the total amount of water consumption, and the amount of the water dissolving and dispersing the carbon fiber accounts for 2/3 of the total amount of water consumption). 16 g redispersible latex powder. 6.4 g water reducing agent are weighed. added into a mortar mixing pot, and stirred at low speed for 30 s with a stirring speed of 140+ r/min. Stopping stirring. the dispersed carbon fiber dispersion is added and stirred at low speed for 30 s with a stirring speed of 1405 r/min. And then 1600 g sand is added and stirred at low speed for 180 s with a stirring speed of 140+ 5 r/min.
Step S3, the mixture is poured into a cement mortar triple die assembly, and the cement mortar triple die assembly is placed on the vibrating table, vibrated and smoothed, and the copper electrode is inserted; the die assembly is released after standing for 24 h. The mixture after releasing the die assembly is moved into a standard curing room with a temperature of 25°C and a relative humidity of 95% for curing.
In this example. the same test method as in example 1 is used. and the resistivity value of the prepared conductive cement-based material 1s 71.23 Qecm.
Example 9 This example provides a preparation method of a carbon fiber-doped conductive cement- based material. including the following steps.
BI.-5201 LU102505 Step S1, 18 g carbon fiber (the content of the mixed carbon fiber is 1 % of the volume of the mixture) is put into a 500 mi beaker. and 266 g water heated to 75° C is added, stirring evenly with a glass rod. The beaker (the resulting product) is put into an ultrasonic cleaner and dispersed ultrasonically for 15 min to obtain a pre-dispersed carbon fiber solution; 4.8 g methyl cellulose is weighed. added into the pre-dispersed carbon fiber solution, and stirred evenly with a glass rod, and then 0.48 g defoamer is added with a dropper, and continues to be dispersed ultrasonically for 15 min to obtain a well-dispersed carbon fiber dispersion for use.
Step S2, 690 g sulphate aluminium cement, 110 g ore powder, and 134 g water (the amount of water consumption here is 1/3 of the total amount of water consumption. and the amount of the water dissolving and dispersing the carbon fiber accounts for 2/3 of the total amount of water consumption), 16 g redispersible latex powder, 6.4 g water reducing agent are weighed. added into a mortar mixing pot, and stirred at low speed for 30 s with a stirring speed of 140 + r/min. Stopping stirring, the dispersed carbon fiber dispersion is added and stirred at low speed for 30 s with a stirring speed of 140+ 5 r/min. And then 1600 ¢ sand is added and stirred at low speed for 180 s with a stirring speed of 140 +5 r/min.
Step S3, the mixture is poured into a cement mortar triple die assembly, and the cement mortar triple die assembly is placed on the vibrating table. vibrated and smoothed. and the copper electrode is inserted: the die assembly is released after standing for 20 h. The mixture after releasing the die assembly is moved into a standard curing room with a temperature of 20°C and a relative humidity of 95% for curing.
In this example, the same test method as in example 1 ts used, and the resistivity value of the prepared conductive cement-based material is 51.62 Qscm, Experiment 1 This Experiment is a test of the influence of changing the carbon fiber content on the resistivity of the prepared conductive cement-based material. including the combination of Examples 1-3 with other examples. The steps and methods of the conductive cement-based
BL-5201 LU102505 material prepared in this Experiment are the same as those of example 1, and the difference is only the content of carbon fiber.
The resistivity performance data of the conductive cement-based material prepared in this Experiment 1s shown in Fig. 2.
Control 1 The difference between this Control and Example 2 is that the carbon fiber in step S1 is replaced with a carbon fiber with a diameter of 5mm. The other steps and methods are the same as in example 2, which will not be repeated here.
In this Control, the same test method as in example 1 is used, and the resistivity value of the prepared conductive cement-based material is 106.46 Q-cm.
Control 2 The difference between this Control and Example 2 is that the diameter of the carbon fiber in step S1 is replaced with a carbon fiber with a diameter of 10 mm in this Control. The other steps and methods are the same as in example 2, which will not be repeated here.
fn this Control. the same test method as in example 1 1s used. and the resistivity value of the prepared conductive cement-based material is 198.21 Qeem.
Control 3 The difference between this Control and example 2 is that the redispersible latex powder in step S2 is not added in this Control, and the other steps and methods are the same as in example 2. which will not be repeated here.
In this example, the same test method as in example 1 is used. The fluidity of conductive cement-based mortar without the redispersible latex powder is reduced, and the cohesion of the mortar becomes worse. resulting in that the cohesive force between conductive cement-based material and reinforced concrete decreases. and the resistivity rises slightly. The resistivity
BL-5201 LU102505 value of the conductive cement-based material is 87.27 © cm. Control 4 The difference between this Control and example 2 is that the amount of dispersant methyl cellulose added in step S1 accounts for 0.2% of the mass of the gel material in this Control. The other steps and methods are the same as in example 2. which will not be repeated here.
In this example, the same test method as in example ! is used. The decrease of the dispersant addition will reduce the dispersion of carbon fiber. resulting in an increase in resistivity. At this time, the resistivity of the conductive cement-based material is 87.82 Qeem.
Control 5 The difference between this Control and example 2 is that in this Control. the amount of water reducing agent added in step S2 accounts for 0.3% of the mass of the gel material (cement and ore powder). The other steps and methods arc the same as in example 2, which will not be repeated here.
In this example. the same test method as in example 1 is used. The reduction of the amount of water reducing agent added can reduce the fluidity of the mortar and make the workability of the conductive cement base worse, which will also cause the carbon fiber to be difficult to disperse in the cement base with adhesion and agglomeration, resulting in an increase of the resistivity of the conductive cement-based material. The resistivity of the conductive cement- based material prepared in this Control is 217.10 Q=cm.
Control 6 The difference between this Control and example 2 is that in this Control. the cement used in step S1 is replaced with silicate cement. The other steps and methods are the same as in example 2. which will not be repeated here.
In this example. the same test method as in example 1 is used. When the traditional silicate
BL-5201 LU102505 cement is used as the gel material, the change of the conductive cement-based material is mainly reflected in the prolonged setting time of the conductive cement base. Compared to example 2 wherein the used raw material sulphate aluminium cement can be coagulated in 4 h, the setting time of silicate cement used in this Control needs 24 h. and the early strength growth is slow, and the later strength grows steadily, which is not suitable for rapid repairing projects and has an negligible impact on the resistivity ol conductive cement base. The resistivity of the conductive cement-based material prepared in this Control is 73.60 (scm.
In summary, in example 2, when the content of carbon fiber is increased to 0.8% of the volume of the mixture, the resistivity of the prepared conductive cement-based material can be reduced greatly, and the conductive performance will be improved. In the present invention, the content of carbon fiber used accounts for 0.6%-1% of the volume of the mixture. which is a selection on consideration of cost and dechlorination effect. The preparation method of carbon fiber-doped conductive cement-based material in the present invention adopts a reasonable water-gel ratio, a mortar-sand ratio and reasonably controls the size and content of carbon fiber. and the amount of additives to obtain the cement-based material with excellent conductive performance, and excellent mechanical properties and durability, which can be used for a long time, and has broad development and application prospects in the ficlds. such as electrochemical desalination and steel corrosion monitoring. The specific effects are as follows.
1. The conductive cement-based material where the sulphate aluminium cement is used as a cement, 1s more environmentally friendly and has better performance than traditional silicate cement. so that the conductive cement basc has early strength and fast hardening properties and is more suitable for repairing projects.
2. The redispersible latex powder is added to the conductive cement base, which improves the cohesive force between the conductive cement base and the reinforced concrete. and improves the durability and toughness of the cement-based material. making the conductive cement base more durably use in harsh environment.
3. The conductive filler used in the conductive cement base of the present invention is
BL-5201 LU102505 carbon fiber with a suitable length and good dispersibility. The carbon fiber 1s distributed in the cement-based material to form a coherent conductive network. Compared with the conduetive materials, such as graphite and carbon nanotubes, the amount of the used carbon fiber is less. which is easier to form a conductive network. and the resistivity of cement-based materials is lower. And the addition of carbon fiber will increase the toughness of the material and effectively reduce the shrinkage of cement-based materials.
4. The present invention combines the modified sulphate aluminium cement and carbon fiber to prepare a conductive cement-based material that has both repairing and conductive functions. It not only has excellent mechanical properties and durability, but also has lower resistivity, so that it has broad development prospects in the fields, such as electrochemical dechlorination.
The foregoing arc only preferred examples of the present invention, and are not used to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, ete. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims (10)
1.A carbon fiber-doped conductive cement-based material, characterized in that the conductive cement-based material includes a mixture of the following components by weight: 85-90 parts of cement, 125-200 parts of sand. 10-15 parts of ore powder. 1-3 parts of redispersible latex powder. 40-50 parts of water, 0.5-0.8 parts of water reducing agent. 0.03-
0.06 parts of defoamer:; and carbon fiber. a volume of carbon fiber accounts for 0.6-1% of a volume of the above mixture: the conductive cement-based material further includes a dispersant, a mass of the dispersant mixed is 0.4-0.6% of a mass of gel material, and the mass of the gel material is a mass sum of the cement and the ore powder.
2. The carbon fiber-doped conductive cement-based material according to claim 1, characterized in that a length of the carbon fiber is 6-9 mm.
3.The carbon fiber-doped conductive cement-based material according to claim |. characterized in that the cement is sulphate aluminium cement.
4.The carbon fiber-doped conductive cement-based material according to claim 1. characterized in that the dispersant is methyl cellulose.
5.The carbon fiber-doped conductive cement-based material according to claim 1. characterized in that the redispersible latex powder is ethylene vinyl acetate copolymer: the water reducing agent is a water reducing agent of polycarboxylic acid type.
6. A preparation method of the carbon fiber-doped conductive cement-based material according to any one of claims 1-5, characterized in that the preparation method comprises the following
BL-5201 LU102505 steps ol: S1. preparing a carbon fiber dispersion comprising: dissolving the carbon fiber weighed in water and dispersing uniformly to obtain a pre-dispersed carbon fiber solution, adding the dispersant and defoamer to the pre-dispersed carbon fiber solution. and dispersing by stirring and ultrasonic to obtain the carbon fiber dispersion: S2, preparing a cement-based mortar comprising: adding the cement, orc powder, redispersible latex powder, water, and water reducing agent into a blender and stirring evenly, then adding the carbon fiber dispersion obtained in step S1 into the blender and stirring evenly. adding the sand into the blender. and stirring evenly to obtain the cement-based mortar mixture; S3. forming the conductive cement-based material comprising: filling the cement-based mortar obtained in step S2 into a die assembly. vibrating and smoothing. inserting an electrode material, releasing the die assembly after standing for 4-24 h, performing a curing to obtain the conductive cement-based material.
7. The preparation method of the carbon fiber-doped conductive cement-based material according to claim 6. characterized in that a specific preparation process of the pre-dispersed carbon fiber solution in step S1 is that the carbon fiber is dissolved in water. and the water is heated to 65-75°C and ultrasonically dispersed for 5-15 minutes to obtain the pre-dispersed carbon fiber solution.
8.The preparation method of the carbon fiber-doped conductive cement-based material according to claim 6, characterized in that in step S1. the dispersant is added 10 the pre-dispersed carbon fiber solution. and dispersed by stirring and ultrasonic for 5-15 min; in step S1. the water dissolving the carbon fiber accounts for 1/3 to 2/3 of the amount of water in the mixture.
BL-5201 LU102505
9.The preparation method of the carbon fiber-doped conductive cement-based material according to claim 6, characterized in that in step S3, a condition of the curing is that curing is performed in a curing room with a temperature of 15-25°C and a relative humidity of >90%.
10.A use of the carbon fiber-doped conductive cement-based material according to any one of claims 1-5, or a conductive cement-based material prepared by the preparation method according to any one of claims 6-9. characterized in that the conductive cement-based matcrial is applied to electrochemical dechlorination.
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| CN112500073B (en) * | 2020-12-08 | 2022-06-21 | 武汉纺织大学 | Cement-based electroflocculation cathode material and preparation and application methods thereof |
| CN113060989A (en) * | 2021-03-25 | 2021-07-02 | 中国人民解放军空军工程大学 | Method for enhancing concrete resistance and electromagnetic shielding performance by using carbon nanofibers |
| CN113200720A (en) * | 2021-05-14 | 2021-08-03 | 广西鑫和建材科技产业开发有限公司 | Low-cost concrete material special for flood fighting, disaster relief and emergency rescue and preparation method thereof |
| CN114149213B (en) * | 2021-12-02 | 2022-12-30 | 国网江西省电力有限公司电力科学研究院 | Cement-based conductive composite material based on conductive aggregate and preparation method thereof |
| CN114149211B (en) * | 2021-12-02 | 2023-03-17 | 国网江西省电力有限公司电力科学研究院 | Cement-based composite material based on multi-wall carbon nano tube and preparation method thereof |
| CN115385621A (en) * | 2022-07-11 | 2022-11-25 | 长安大学 | Self-induction conductive cement composite material and preparation method thereof |
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| KR20050104156A (en) * | 2004-04-28 | 2005-11-02 | 주식회사 인트켐 | Electro-conductive alumino-silicate type mortar composition with high chemical resistance and fire resistance |
| US7341627B2 (en) * | 2005-02-18 | 2008-03-11 | Ogden Technologies, Inc. | Fiber reinforced concrete products and method of preparation |
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| CN109836083A (en) * | 2019-04-09 | 2019-06-04 | 刘铁民 | A kind of cement self-leveling mortar of antistatic fire-retardant |
| CN111235581A (en) * | 2020-03-13 | 2020-06-05 | 青岛理工大学 | Device for electrochemical dechlorination by taking conductive cement base as external anode |
| CN111268978A (en) * | 2020-03-13 | 2020-06-12 | 青岛理工大学 | Carbon fiber doped conductive cement-based material and preparation method and application thereof |
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