CN113754369B - Preparation and application of graphene-carbon nanotube-carbon fiber reinforcement concrete - Google Patents
Preparation and application of graphene-carbon nanotube-carbon fiber reinforcement concrete Download PDFInfo
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- 229910052786 argon Inorganic materials 0.000 description 2
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- WOXXJEVNDJOOLV-UHFFFAOYSA-N ethenyl-tris(2-methoxyethoxy)silane Chemical compound COCCO[Si](OCCOC)(OCCOC)C=C WOXXJEVNDJOOLV-UHFFFAOYSA-N 0.000 description 2
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Classifications
-
- 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
- C04B28/04—Portland cements
-
- 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
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention discloses graphene-carbon nano tube-carbon fiber reinforcement reinforced concrete and a preparation method and application thereof. The material comprises the following raw materials in parts by weight: 2.0 to 4.0 parts of graphene-carbon nano tube-carbon fiber reinforcement, 35 to 55 parts of cement, 4 to 8 parts of dispersing agent, 0.5 to 3.5 parts of water reducer, 10 to 30 parts of water and 20 to 30 parts of sand stone. The concrete of the invention fully mixes the graphene-carbon nano tube-carbon fiber reinforcement and the dispersing agent, and adds the mixture into cement to obtain a mixture; uniformly mixing water and a water reducing agent to obtain stirring water; adding the sand and the mixture into a stirrer for dry stirring, and adding stirring water for stirring to prepare the mortar. The invention fully utilizes the high mechanical property of the graphene-carbon nano tube-carbon fiber reinforcement to improve the toughness of the concrete, has the advantages of excellent quality, simple preparation process and the like, and is suitable for large-area popularization and application.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to preparation and application of graphene-carbon nano tube-carbon fiber reinforcement concrete.
Background
With the development of economy, the modernization degree is deepened continuously, the super-infrastructure engineering mainly adopts a large amount of cement-based materials, and increasingly severe use environments put higher performance requirements on concrete. In addition, the concrete structure is easy to be suddenly damaged in the continuous cyclic loading and unloading process, and serious property loss and casualties are caused. There is therefore a need for larger spans and higher levels of modern buildings, and in order to meet these needs, there is a need for building materials, in particular cement-based composites, in which the use of fiber reinforcement is critical. Therefore, the research of the fiber reinforced cement composite material is greatly broken through at home and abroad.
In recent years, the development of interdisciplinary subjects such as material physics and chemistry has greatly promoted the progress of the research of cement-based machine materials. Particularly, with the development of nano materials and the increasing functional demands of cement concrete, advanced nano materials such as nano carbon fibers, carbon nanotubes and graphene oxide are used in cement matrixes to prepare cement-based composite materials with self-diagnosis, self-adjustment, self-adaption or self-repair functions, and a relatively rich research result is obtained. However, research shows that the cement-based material has a large improvement space in the aspects of improving the mechanical property, engineering intelligent application and the like at the same time due to various factors such as the electric conductivity, the physical and mechanical properties or the combination problem between the cement-based material and the cement matrix, and the research and the application of the cement concrete are still promoted by means of the innovation of the material. Graphene is a high-performance material which is newly grown in recent years, is the thinnest nano material with the greatest strength in the world at present, and has wide market prospect. The carbon fiber reinforcement is used as a fiber reinforcement material, and has the advantages of outstanding mechanical properties, small specific gravity and strong acid and alkali corrosion resistance. The carbon fiber as the reinforcement not only can improve the flexural strength and tensile strength of the cement composite material, but also has the characteristics of light weight, high strength, impact resistance, difficult drying shrinkage and the like of the cement-based concrete material. Based on this, carbon fiber cement-based materials are becoming more and more favored. Therefore, graphene and carbon fiber are required to be applied to concrete together, and dispersion optimization and interface modification are realized in the cement-based material so as to improve the toughness of the concrete.
Disclosure of Invention
Aiming at the prior art, the invention aims to provide preparation and application of graphene-carbon nano tube-carbon fiber reinforcement concrete. The invention applies the graphene-carbon nano tube-carbon fiber reinforcement to concrete, and the invention focuses on the preparation of the graphene-carbon nano tube-carbon fiber reinforcement and the dispersion optimization and interface modification in cement-based materials, so that various performances of the cement-based materials are improved on the premise of meeting the actual demands of the cement-based materials.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides graphene-carbon nanotube-carbon fiber reinforcement concrete, which comprises the following raw materials in parts by weight:
2.0 to 4.0 parts of graphene-carbon nano tube-carbon fiber reinforcement, 35 to 55 parts of cement, 4 to 8 parts of dispersing agent, 0.5 to 3.5 parts of water reducer, 10 to 30 parts of water and 20 to 30 parts of sand stone.
Preferably, the cement is Portland cement.
Preferably, the carbon nanotube-carbon fiber reinforcement is prepared by the following method: mixing the carbon nano tube-carbon fiber reinforcement with graphene according to a weight ratio of 80:20 to prepare a graphene-carbon nano tube-carbon fiber reinforcement;
preferably, the carbon nanotube-carbon fiber reinforcement is prepared by the following method:
1) Carrying out electrochemical modification on the 12K carbon fiber to obtain a carbon fiber after surface treatment;
2) Immersing the carbon fiber obtained in the step 1) into a metal salt solution, putting the immersed carbon fiber into a tube furnace, and introducing protective gas and H 2 Obtaining carbon fiber with metal nano particles loaded on the surface;
3) Putting the carbon fiber obtained in the step 2) into a chemical vapor deposition furnace, and simultaneously introducing H 2 And C 2 H 2 And obtaining the carbon fiber with the surface of which the carbon nano tube grows.
Preferably, the graphene is prepared by a modified Hummers method.
Preferably, the cement is Portland cement.
Preferably, the dispersant is an anionic surfactant;
preferably, the dispersing agent is selected from one or more of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltris (beta-methoxyethoxy) silane, sodium oleate or sodium dodecylbenzenesulfonate.
Preferably, the water reducer is prepared by compounding 1-10wt% of defoaming component and 90-99wt% of mother solution and dispersing the mixture in water.
Preferably, the mother liquor is selected from methylallyl alcohol polyoxyethylene ether, methoxy polyethylene glycol methacrylate, allyl polyoxyethylene ether or isopentenyl alcohol polyoxyethylene ether; the defoaming component is selected from ethylene bis stearamide, calcium stearate, polyether modified silicon or glyceryl monostearate.
Preferably, the sand and stone comprise river sand and stone, wherein the grain size of the river sand is 0.2-0.5mm, and the average grain size of the stone is 10mm; the river sand accounts for 40-70% of the total weight of the sand stone.
In a second aspect of the present invention, there is provided a method for preparing graphene-carbon nanotube-carbon fiber reinforcement concrete, comprising the steps of:
1) Firstly, fully mixing the graphene-carbon nano tube-carbon fiber reinforcement and the dispersing agent by utilizing ultrasonic treatment, and then adding the mixture into cement to uniformly mix to obtain a mixture;
2) Uniformly mixing water and a water reducing agent by ultrasonic treatment to obtain stirring water;
3) Sequentially adding the sand and the mixture obtained in the step 1) into a stirrer for dry mixing, adding the stirring water obtained in the step 2) into the mixture for stirring, and uniformly mixing to obtain the graphene-carbon nano tube-carbon fiber reinforced concrete.
Preferably, the time of the ultrasonic treatment is 60s, and the power of the ultrasonic treatment is 200-220W.
Preferably, after the mixture obtained in the step 1) and the sand are mixed, a stirrer is started to dry mix for 60 seconds, the stirrer is stopped, stirring water obtained in the step 2) is added, and stirring is continued for 300 seconds.
The invention has the beneficial effects that:
the invention applies the graphene-carbon nano tube-carbon fiber reinforcement to concrete, and the invention focuses on the preparation of the graphene-carbon nano tube-carbon fiber reinforcement and the dispersion optimization and interface modification in cement-based materials, so that various performances of the cement-based materials are improved on the premise of meeting the actual demands of the cement-based materials. The invention fully utilizes the comprehensive mechanical property of the carbon fiber reinforcement to improve the toughness of the concrete, has the advantages of excellent quality, simple preparation process and the like, and is suitable for large-area popularization and application.
Drawings
FIG. 1 is a schematic diagram showing the steps of the graphene-carbon nanotube-carbon fiber reinforcement reinforced concrete prepared by the method of the present invention;
FIG. 2 is a scanning electron microscope image of the carbon nanotube-carbon fiber reinforcement prepared in example 1;
FIG. 3 is a scanning electron microscope image of the graphene results prepared in example 1;
fig. 4 is a toughness test result of graphene-carbon nanotube-carbon fiber reinforcement reinforced concrete prepared in examples and comparative examples.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
As described in the background, the real-time, convenient and efficient monitoring of the safety of cement concrete structures while simultaneously improving the conventional performance of cement-based materials is one of the most important challenges faced in the current and future sustainable development processes of cement-based materials.
Based on the preparation method, the preparation and the application of the graphene-carbon nano tube-carbon fiber reinforcement concrete are provided. The invention adopts graphene-carbon nano tube-carbon fiber reinforcement, and specially prepared dispersing agent and water reducer are needed. Compared with common carbon fibers, the graphene-carbon nano tube-carbon fiber reinforcement has good surface layer structure state and has a region for enhancing mechanical properties, and the invention discovers that the dispersing agent can fully contact with the graphene-carbon nano tube-carbon fiber reinforcement through the fine advantage of the dispersing agent, improves the contact surface state between carbon fibers and promotes the dispersion of the carbon fiber reinforcement to be more uniform; the invention can effectively reduce the bubble content brought by organic matters generated by mixing of the carbon fiber reinforcement in the system by utilizing the defoaming component compounded in the water reducer, thereby improving the discrete effect of the graphene-carbon nano tube-carbon fiber reinforcement in the cement material. Meanwhile, the dispersing agent and the water reducing agent are matched for use, so that the dispersing effect of the graphene-carbon nano tube-carbon fiber reinforcement body on the cement material can be improved, the physical contact state with the concrete is improved, the embedded effect formed by the dispersing agent in the hydration reaction of the cement is improved, and the chemical combination state of the embedded effect with the concrete is improved, so that the interface structure of the concrete can achieve the combination of physical and chemical improvement, and under the same use condition, the requirements of the cement-based material on the conductive intelligence are met, and meanwhile, the aim of reducing the production cost is fulfilled.
In order to enable those skilled in the art to more clearly understand the technical solutions of the present application, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
The test materials used in the examples of the present invention are all conventional in the art and are commercially available.
Description: the portland cement used in the examples and comparative examples was 425 portland cement.
Dispersants (vinyltriethoxysilane and sodium dodecylbenzenesulfonate) were purchased from the industry company, san Chuan chemical Co., ltd;
example 1: preparation of graphene-carbon nanotube-carbon fiber reinforcement
1) Preparation of carbon nanotube-carbon fiber reinforcement:
step 1: carrying out electrochemical modification on the carbon fiber to promote uniform coating of the catalyst precursor, wherein the electrochemical anodic oxidation time is 40s, and the current intensity is 0.2A;
step 2: the carbon fiber was immersed in 0.03mol/L of the catalyst precursor (Co (NO) 3 ) 2 ) For 5min;
step 3: pulling the carbon fiber obtained in the step 2 into a tube furnace, and adding N into the furnace 2 In atmosphere, utilize H 2 Reducing the catalyst precursor coating into metal nano particles, wherein the reduction temperature is 450 ℃, and the reduction time is 10min;
step 4: continuously extending the carbon fiber sample obtained in the step 3 into a chemical vapor deposition furnace, and introducing H 2 And C 2 H 2 The carbon nanotubes were synthesized at 650 c, and finally the samples were collected by an electric winder.
2) Preparation of graphene: GO was prepared using the modified Hummers method. First, 2g of flake graphite powder and 1g of NaNO are mixed 3 Is dispersed in 46mL of concentrated H 2 SO 4 And the mixture was placed in a thermostatic water bath at 5 ℃ to stir the mixture. 6g KMnO 4 Slowly adding KMnO into the above mixture 4 And controlling the temperature of the system to avoid temperature sharp increase, wherein the stage is a low-temperature reaction stage with the duration of 2 hours. Then the reaction system is heated to 35 ℃ and kept at the temperature for 1h, and stirring is continued in the process. After the medium temperature reaction stage, the temperature was raised to 85 ℃, 100mL deionized water was slowly added to dilute the reactants and the system turned brown. Finally, 30mL of H was added to the reaction solution 2 O 2 At this time, the solution turned bright yellow, and the reaction was completed after 1 hour of high temperature reaction. The solution was filtered while hot and the product was washed with 5% HCl, ethanol and deionized water until the pH of the washing solution was neutral. After sonicating the resulting product for 30min, it was freeze-dried under vacuum for 36h to give a loose brown flaky GO.
3) Preparation of graphene-carbon nanotube-carbon fiber reinforcement
Mixing the carbon nano tube-carbon fiber reinforcement prepared in the step 1) with the graphene prepared in the step 2) according to the weight ratio of 80:20, and then performing ultrasonic treatment with ultrasonic power of 30-40 w and ultrasonic time of 60-180 s to prepare the graphene-carbon nano tube-carbon fiber reinforcement.
Example 2: preparation of graphene-carbon nano tube-carbon fiber reinforcement reinforced concrete
The specific method comprises the following steps:
1) Weighing and taking: 45kg of Portland cement; 4.0kg of vinyltriethoxysilane and 2.0kg of sodium dodecyl benzene sulfonate; 2kg of water reducer (ethylene bis stearamide 5wt% and methallyl alcohol polyoxyethylene ether 95 wt%); 20kg of tap water; 13.2kg of river sand; 10.8kg of crushed stone; 3.0kg of graphene-carbon nanotube-carbon fiber reinforcement prepared in example 1.
2) Adding the graphene-carbon nano tube-carbon fiber reinforcement and the dispersing agent into a stirrer, stirring for 60s, fully mixing, adding the required cement into the stirrer, and continuously stirring for 60s to uniformly mix the cement, the carbon fiber and the dispersing agent.
3) Pouring the required water and water reducer into a barrel, and uniformly mixing the water and the water reducer by utilizing ultrasonic waves for 60 seconds and ultrasonic power of 200W to obtain stirring water;
4) Firstly, adding required sand and stone into a forced stirrer; and then adding the mixture of the cement, the graphene-carbon nano tube-carbon fiber reinforcement and the dispersing agent obtained after the uniform mixing in the step 2) into a forced mixer, and finally pouring the stirring water obtained in the step 3). The stirring method comprises the following steps: after the first two steps of adding, the stirrer is started, dry mixing is carried out for 60 seconds, then the stirring water mixed with the polycarboxylate water reducer is turned off, the stirring water is poured into the stirrer, after 300 seconds of stirring, the stirring water is discharged, and the required concrete is obtained. Then according to CECS13: and 2009 fiber concrete test method standard is used for testing the fresh mixing performance such as working performance and the like.
Example 3: preparation of graphene-carbon nano tube-carbon fiber reinforcement reinforced concrete
The specific method comprises the following steps:
1) Weighing and taking: 55kg of Portland cement; 3.0kg of vinyltris (. Beta. -methoxyethoxy) silane and 1.0kg of sodium dodecylbenzenesulfonate; 12.0kg of river sand; 18.0kg of crushed stone; 30kg of tap water; 3.5kg of water reducer (10 wt% of polyether modified silicon and 90wt% of isopentenyl alcohol polyoxyethylene ether), and 2.0kg of graphene-carbon nanotube-carbon fiber reinforcement prepared in example 1.
2) 4) are the same as in example 1.
Example 4 preparation of graphene-carbon nanotube-carbon fiber reinforced concrete
The specific method comprises the following steps:
1) Weighing and taking: 35kg of Portland cement; vinyl trimethoxy silane 5kg, sodium oleate 3kg, river sand 14.0kg; 6.0kg of crushed stone; 10kg of tap water; 0.5kg of water reducer (1 wt% of calcium stearate, 99% of methoxy polyethylene glycol methacrylate); 4.0kg of graphene-carbon nanotube-carbon fiber reinforcement prepared in example 1.
2) 4) are the same as in example 1.
Comparative example 1
1) 45kg of Portland cement; 4.0kg of vinyltriethoxysilane and 2.0kg of sodium dodecyl benzene sulfonate; 2kg of water reducer (ethylene bis stearamide 5wt% and methallyl alcohol polyoxyethylene ether 95 wt%); 20kg of tap water; 13.2kg of river sand; 10.8kg of crushed stone; 3.0kg of carbon fiber.
2) 4) are the same as in example 1.
Comparative example 2
1) Weighing and taking: 45kg of Portland cement; 4.0kg of vinyltriethoxysilane and 2.0kg of sodium dodecyl benzene sulfonate; 2kg of water reducer (ethylene bis stearamide 5wt% and methallyl alcohol polyoxyethylene ether 95 wt%); 20kg of tap water; 13.2kg of river sand; 10.8kg of crushed stone; 3.0kg of graphene.
2) 4) are the same as in example 1.
Comparative example 3
1) Weighing and taking: 45kg of Portland cement; 4.0kg of vinyltriethoxysilane and 2.0kg of sodium dodecyl benzene sulfonate; 2kg of water reducer (ethylene bis stearamide 5wt% and methallyl alcohol polyoxyethylene ether 95 wt%); 20kg of tap water; 13.2kg of river sand; 10.8kg of crushed stone; 3.0kg of carbon nanotube-carbon fiber reinforcement.
2) 4) are the same as in example 1.
Comparative example 4
1) Weighing and taking: 45kg of Portland cement; 4.0kg of vinyltriethoxysilane and 2.0kg of sodium dodecyl benzene sulfonate; 2kg of water reducer (ethylene bis stearamide 5wt% and methallyl alcohol polyoxyethylene ether 95 wt%); 20kg of tap water; 13.2kg of river sand; 10.8kg of crushed stone; 1.5kg of graphene and 1.5kg of carbon fiber reinforcement.
2) 4) are the same as in example 1.
Comparative example 5
1) Uniformly dispersing graphene oxide with the sheet diameter of 1-20um, the thickness of 1-2nm and the carbon content of 99.5% in a water phase under the ultrasonic action to prepare a dispersion liquid with the graphene oxide content of 0.1 g/L; adding the dispersion into an iron nano catalyst, performing ultrasonic treatment for 15min, and then placing the mixture into a polytetrafluoroethylene-lined stainless steel water heating reaction kettle under the stirring condition. And reacting for 10 hours at 220 ℃, and naturally cooling to room temperature after the reaction is finished. The reaction product is separated, washed and dried for standby.
And adding the dried reaction product into a corundum crucible, depositing a carbon source by a chemical vapor deposition method, and introducing argon and hydrogen into a deposition reaction zone (the volume ratio is 1:1). After the reaction is completed, stopping heating, closing hydrogen, and closing argon when the temperature in the furnace chamber is reduced to normal temperature. The furnace chamber is opened to remove the reaction products. And obtaining the graphene/carbon nano tube composite material.
Adding 5kg of graphene/carbon nano tube composite material into 38kg of NMP to prepare an organic dispersion liquid, adding 30kg of mesoporous glass beads, uniformly dispersing, and drying to prepare the graphene/carbon nano tube loaded glass beads.
Weighing and taking: 1) Weighing and taking: 45kg of Portland cement; 4.0kg of vinyltriethoxysilane and 2.0kg of sodium dodecyl benzene sulfonate; 2kg of water reducer (ethylene bis stearamide 5wt% and methallyl alcohol polyoxyethylene ether 95 wt%); 20kg of tap water; 13.2kg of river sand; 10.8kg of crushed stone; 3.0kg of glass beads loaded with graphene/carbon nano tubes.
2) 4) are the same as in example 1.
Comparative example 6
1) Weighing and taking: weighing and taking: 45kg of Portland cement; 4.0kg of vinyltriethoxysilane and 2.0kg of sodium dodecyl benzene sulfonate; 2kg of water reducer (ethylene bis stearamide 5wt% and methallyl alcohol polyoxyethylene ether 95 wt%); 20kg of tap water; 13.2kg of river sand; 10.8kg of crushed stone; graphene 1.5kg and carbon nanotube 1.5kg.
Performance comparison the performance of the graphene-carbon nanotube-carbon fiber reinforcement reinforced concrete prepared in examples 2 to 4 and comparative examples 1 to 6 was compared. Immediately after the concrete preparation, the concrete was prepared according to CESE13: according to 2009 fiber concrete test method standards, testing new mixing performances such as working performance and the like, then manufacturing a test die according to the requirement of performance detection, and testing mechanical properties after reaching a specified age. The results of the performance index detection of the concrete are shown in table 1 and fig. 4.
TABLE 1
As shown in Table 1, the concrete prepared in examples 2 to 4 has higher improvement in comprehensive properties than the concrete prepared in comparative examples 1 to 6. Compared with the comparative example, the invention has no negative effect on the working performance and compressive strength of the concrete, and has an enhancement effect on the bending strength; the reinforced concrete prepared in example 2 has much higher toughness than the reinforced concrete prepared in comparative examples 1 to 6 (see load-deflection curves of fig. 4) under the same doping amount as compared with the concrete prepared in comparative examples 1 to 6.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (1)
1. The application of the graphene-carbon nano tube-carbon fiber reinforcement in improving the interface performance of concrete is characterized in that the graphene-carbon nano tube-carbon fiber reinforcement is prepared by the following method: mixing the carbon nano tube-carbon fiber reinforcement with graphene according to a weight ratio of 80:20, and then performing ultrasonic treatment, wherein the ultrasonic power is 30-40 w, and the ultrasonic time is 60-180 s, so as to prepare the graphene-carbon nano tube-carbon fiber reinforcement;
the carbon nanotube-carbon fiber reinforcement is prepared by the following method:
step 1: carrying out electrochemical modification on the carbon fiber to promote uniform coating of the catalyst precursor, wherein the electrochemical anodic oxidation time is 40s, and the current intensity is 0.2A;
step 2: immersing the carbon fiber in 0.03mol/L of catalyst precursor Co (NO 3 ) 2 For 5min;
step 3: pulling the carbon fiber obtained in the step 2 into a tube furnace, and adding N into the furnace 2 In atmosphere, utilize H 2 Reducing the catalyst precursor coating into metal nano particles, wherein the reduction temperature is 450 ℃, and the reduction time is 10min;
step 4: continuously extending the carbon fiber sample obtained in the step 3 into a chemical vapor deposition furnace, and introducing H 2 And C 2 H 2 Synthesizing carbon nanotubes at 650 ℃, and finally collecting a sample by an electric winder;
the concrete is prepared by the following method:
1) Weighing and taking: 45kg of Portland cement; 6.0kg of dispersing agent; 2.0kg of water reducer; 20kg of tap water; 13.2kg of river sand; 10.8kg of crushed stone; 3.0kg of graphene-carbon nano tube-carbon fiber reinforcement; the mass of ethylene-based bis-stearamide in the water reducer is 5%, and the mass of methallyl alcohol polyoxyethylene ether is 95%; the dispersing agent consists of 4.0kg of vinyltriethoxysilane and 2.0kg of sodium dodecyl benzene sulfonate;
2) Adding the graphene-carbon nano tube-carbon fiber reinforcement and the dispersing agent into a stirrer, stirring for 60s, adding the required cement into the stirrer, and continuously stirring for 60s to uniformly mix the cement, the graphene-carbon nano tube-carbon fiber reinforcement and the dispersing agent;
3) Pouring the required water and water reducer into a barrel, and uniformly mixing the water and the water reducer by utilizing ultrasonic waves for 60 seconds and ultrasonic power of 200W to obtain stirring water;
4) Firstly, adding required sand and stone into a forced stirrer; adding the mixture of the cement, the graphene-carbon nano tube-carbon fiber reinforcement and the dispersing agent obtained after the uniform mixing in the step 2) into a forced mixer, and finally pouring the stirring water obtained in the step 3); the stirring method comprises the following steps: after the addition of the first two steps, the mixer is started for 60 seconds, then the mixer is turned off, the water for stirring in the step 3) is poured into the mixer for 300 seconds, and the mixer is discharged after stirring, so that the required concrete is obtained.
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| CN109797540A (en) * | 2018-12-26 | 2019-05-24 | 山东大学 | A kind of preparation method of carbon fiber surface on-line continuous growth carbon nanotube |
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| CN109797540A (en) * | 2018-12-26 | 2019-05-24 | 山东大学 | A kind of preparation method of carbon fiber surface on-line continuous growth carbon nanotube |
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