CN113929391A - Carbon fiber reinforced concrete and preparation method and application thereof - Google Patents

Carbon fiber reinforced concrete and preparation method and application thereof Download PDF

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CN113929391A
CN113929391A CN202111250636.8A CN202111250636A CN113929391A CN 113929391 A CN113929391 A CN 113929391A CN 202111250636 A CN202111250636 A CN 202111250636A CN 113929391 A CN113929391 A CN 113929391A
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carbon fiber
reinforced concrete
fiber reinforced
carbon
concrete
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傅强
赵旭
张兆瑞
周枝明
王振华
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Xian University of Architecture and Technology
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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
    • C04B28/04—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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • C04B14/386—Carbon
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00—Coherent pavings made in situ
    • E01C7/08—Coherent pavings made in situ made of road-metal and binders
    • E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
    • E01C7/14—Concrete paving
    • E01C7/142—Mixtures or their components, e.g. aggregate
    • 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
    • C04B2111/2038—Resistance against physical degradation

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  • Ceramic Engineering (AREA)
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Abstract

The invention relates to carbon fiber reinforced concrete and a preparation method and application thereof. According to the carbon fiber reinforced concrete provided by the disclosure, on the premise that only carbon fibers are added into the admixture, no additional dispersing agent or coupling agent or other components are needed, the bonding strength of the carbon fibers and the concrete matrix can be improved through the added mineral admixture (river sand), the influence of an interface transition region on the concrete performance is reduced, and the carbon fiber reinforced concrete with high dynamic split tensile resistance is obtained.

Description

Carbon fiber reinforced concrete and preparation method and application thereof
Technical Field
The disclosure relates to the technical field of civil engineering, in particular to carbon fiber reinforced concrete and a preparation method and application thereof.
Background
At present, the addition of randomly distributed fibers to concrete to make fiber reinforced concrete has been identified and practiced as a solution to improve the tensile, bending and split tensile strength of concrete. The fiber with the geometric dimension and the physical and mechanical properties can fully exert respective reinforcing effects in different levels and stress stages of the concrete, and obviously improve the toughness and the shock resistance of the concrete. The fiber concrete has wide application prospect in engineering structures which are easy to suffer various impact and explosion effects, such as protective structures, engineering structures in earthquake regions, airport runways, ocean engineering structures, offshore engineering structures and the like.
Currently, fibers commonly used in concrete include polypropylene fibers and steel fibers. The polypropylene fiber has good mechanical bonding effect, and the steel fiber has high elastic modulus and strength, so that the mechanical property and the durability of concrete can be improved by adding the steel fiber into the concrete. However, polypropylene fibers have poor fire resistance and a low elastic modulus, and although the addition of polypropylene fibers to concrete can enhance the impact resistance of concrete to a certain extent, the effect of enhancing the dynamic split tensile resistance is not so great, so that the obtained concrete cannot resist various impacts, explosions, and the like. The performance of the steel fiber is similar to that of the steel bar, so that the steel fiber not only increases the self weight of the structure when being doped into concrete, but also is easy to rust, and the durability of the concrete structure can be seriously reduced when the steel fiber is applied to a maritime work concrete structure. Meanwhile, because the fibers are not easy to disperse in other materials, when the fibers are used, a large amount of external additives such as a dispersing agent, a coupling agent and the like need to be additionally added, so that the cost of the concrete is enhanced on one hand, and on the other hand, the addition of a large amount of additives can also have adverse effects on the tensile property, the bending resistance and the dynamic split tensile resistance of the concrete.
Accordingly, there is a need to provide a carbon fiber reinforced concrete material having excellent dynamic shear tensile resistance without adding a large amount of additives.
Disclosure of Invention
In order to solve the above technical problem or at least partially solve the above technical problem, the present disclosure provides a carbon fiber reinforced concrete, a method of manufacturing the same, and an application of the same.
In a first aspect, the present disclosure provides a carbon fiber reinforced concrete, the raw materials of which are composed of cement, river sand, crushed stone, a water reducing agent, water and carbon fibers.
The carbon fiber is a fiber bundle consisting of a plurality of single fiber layered graphite layered small crystals, and has the advantages of high strength, high elastic modulus, small specific gravity, fatigue resistance, corrosion resistance, low thermal expansion coefficient and the like; therefore, under certain conditions, the carbon fiber can replace steel fiber and polypropylene fiber to be used as a reinforcing and toughening material for concrete. When the carbon fiber is doped into concrete, the carbon fiber can play a role in different mechanical scales of the concrete due to the excellent physical and mechanical properties of the carbon fiber, so that the mechanical properties of the concrete are effectively improved.
According to the carbon fiber reinforced concrete provided by the disclosure, on the premise that only carbon fibers are added into the admixture, no additional dispersing agent or coupling agent or other components are needed, the bonding strength of the carbon fibers and the concrete matrix can be improved through the added mineral admixture (river sand), the influence of an interface transition region on the concrete performance is reduced, and the carbon fiber reinforced concrete with high dynamic split tensile resistance is obtained.
The carbon fiber reinforced concrete split-pulling device has the advantages that the carbon fiber is uniformly dispersed in the concrete, when the concrete is applied and cracks in a concrete matrix expand under the load effect, the better bonding performance between the carbon fiber and the concrete can play a role of crack bridging, the dynamic split-pulling performance of the concrete is favorably improved, the typical brittleness characteristic of a concrete material is improved, the deformation resistance and the split-pulling strength of the concrete are greatly improved, the serious safety problem that a concrete structure is exposed due to insufficient split-pulling strength can be solved to a certain extent, and the service life of an engineering structure with insufficient split-pulling strength can be effectively prolonged.
As a preferable technical scheme of the present disclosure, the adding amount of the carbon fiber is 0.3-0.9%, preferably 0.6% of the weight of the cement.
In the present disclosure, when the addition amount of the carbon fiber is 0.6% by weight of the cement, the dispersion effect of the carbon fiber in the concrete is the best, the reinforcing effect is the best, and the final reinforced concrete has excellent dynamic split tensile strength. If the amount of the carbon fibers added is small, the reinforcing effect is poor, and if the amount of the carbon fibers added is too large, the carbon fibers are accumulated in the concrete, and the dispersibility is poor, thereby deteriorating the performance of the concrete.
As a preferred technical scheme of the present disclosure, the carbon fiber reinforced concrete comprises the following raw materials in parts by weight:
Figure BDA0003322488570000031
as a specific embodiment of the present disclosure, the raw materials of the carbon fiber reinforced concrete comprise, by weight:
Figure BDA0003322488570000032
as a specific embodiment of the present disclosure, the raw materials of the carbon fiber reinforced concrete comprise, by weight:
Figure BDA0003322488570000033
as a specific embodiment of the present disclosure, the raw materials of the carbon fiber reinforced concrete comprise, by weight:
Figure BDA0003322488570000041
as a preferred technical scheme of the present disclosure, the carbon content of the carbon fiber is more than 95 wt%, the diameter is 5-8 μm, the length is 3-5mm, and the density is more than 1.6g/cm3Preferably, the carbon content of the carbon fibers is > 95 wt.%, the diameter is 7 μm, the length is 4mm, and the density is 1.63g/cm3The tensile strength was 3.53GPa and the tensile modulus was 258 GPa.
As a preferred embodiment of the present disclosure, the cement is Portland cement, and preferably, the cement is P.O 42.5R-grade Portland cement.
As a preferred technical scheme of the present disclosure, the fineness modulus of the river sand is 2.7.
As a preferred technical scheme of the present disclosure, the maximum particle size of the crushed stone is 20 mm.
As a preferred technical scheme of the present disclosure, the water reducing agent is a polycarboxylate water reducing agent, and preferably, the water reducing agent is a polycarboxylic acid high performance water reducing agent with a water reducing rate of 30%.
In a second aspect, the present invention provides a method for preparing a carbon fiber reinforced concrete according to the first aspect, the method comprising the steps of:
(1) mixing the carbon fiber with the formula amount and part of water and performing ultrasonic dispersion;
(2) mixing the cement, river sand and crushed stone according to the formula amount, and then adding water with half of the total water consumption for mixing;
(3) mixing the water reducing agent with the rest water according to the formula amount;
(4) and (3) further mixing the mixtures obtained in the steps (1) to (3) to obtain the carbon fiber reinforced concrete.
As a specific embodiment of the present disclosure, the preparation method includes the steps of:
(1) mixing the carbon fiber with the formula amount with part of water, and performing ultrasonic dispersion for 3min by using the dispersion energy of 1.87KJ per gram of carbon fiber;
(2) mixing and stirring the cement, river sand and crushed stone in the formula amount for 2min, and then adding water with half of the total water consumption for mixing and stirring for 2 min;
(3) mixing the water reducing agent with the rest water according to the formula amount;
(4) and (3) adding the carbon fiber dispersion liquid obtained in the step (1) into the mixture obtained in the step (2), stirring for 2min, adding the mixed liquid obtained in the step (3), and continuously mixing for 2min to obtain the carbon fiber reinforced concrete.
In a third aspect, the present invention provides the use of a carbon fibre reinforced concrete according to the first aspect in an airport runway, an oceanographic engineering structure, a seismic protection structure or an engineering structure for blasting.
The carbon fiber reinforced concrete provided by the disclosure has excellent dynamic split tensile resistance and deformation resistance, and can be applied to scenes frequently suffering from various impacts and explosions.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
(1) according to the carbon fiber reinforced concrete provided by the disclosure, on the premise that only carbon fibers are added into the admixture, no additional dispersing agent or coupling agent or other components are needed, the bonding strength of the carbon fibers and the concrete matrix can be improved through the added mineral admixture (river sand), the influence of an interface transition region on the concrete performance is reduced, and the carbon fiber reinforced concrete with high dynamic split tensile resistance is obtained;
(2) when the carbon fiber reinforced concrete provided by the disclosure generates cracks and expands under the load action, the better bonding property between the carbon fibers and the concrete can play a role in crack bridging, the dynamic split-pulling property of the concrete is favorably improved, the typical brittleness characteristic of a concrete material is improved, and the deformation resistance and the split-pulling strength of the concrete are greatly improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a graph showing the variation of dynamic split tensile strength of carbon fiber reinforced concrete with strain rate according to examples and comparative examples of the present disclosure;
FIG. 2 is a graph showing the change of dynamic energy consumption with strain rate of carbon fiber reinforced concrete provided in the examples and comparative examples of the present disclosure;
fig. 3 is a dispersion morphology of carbon fibers in carbon fiber reinforced concrete in concrete provided in embodiment 2 of the present disclosure;
fig. 4 is a dispersion morphology diagram of carbon fibers in carbon fiber reinforced concrete provided in embodiment 3 of the present disclosure in concrete.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
Example 1
The embodiment provides carbon fiber reinforced concrete (CFC-0.3), which comprises the following raw materials:
Figure BDA0003322488570000061
wherein the cement is P.O 42.5R-grade ordinary portland cement; the river sand is river sand with fineness modulus of 2.7; the maximum particle size of the crushed stone is 20 mm; the water reducing agent is a polycarboxylic acid high-performance water reducing agent with the water reducing rate of 30 percent; carbon content of carbon fiber>95 wt%, a diameter of 7 μm, a length of 4mm, a tensile strength of 3.53GPa, a tensile modulus of 258GPa, a density of 1.63g/cm3。
The preparation method comprises the following steps:
(1) mixing carbon fiber with a small amount of water in a beaker, and performing ultrasonic dispersion for 3min at the dispersion energy of 1.87KJ per gram of carbon fiber;
(2) mixing and dry-stirring cement, river sand and crushed stone for 2min, and then adding water with half of the total water consumption for mixing and stirring for 2 min;
(3) mixing the water reducing agent with the rest water according to the formula amount;
(4) and (3) adding the carbon fiber dispersion liquid obtained in the step (1) into the mixture obtained in the step (2), stirring for 2min, adding the mixed liquid obtained in the step (3), and continuously mixing for 2min to obtain the carbon fiber reinforced concrete.
Examples 2 to 3
The present embodiment provides a carbon fiber reinforced concrete.
The only difference from example 1 is that in this example, the amount of carbon fibers added is 1.89kg/m3Example 2 CFC-0.6), 2.835kg/m3(example 3, CFC-0.9).
Comparative example 1
This comparative example provides a concrete (PC).
The only difference from example 1 is that in this comparative example, no carbon fibers were added.
And (3) performance testing:
the carbon fiber reinforced concrete provided by the examples and the comparative examples is prepared into a test piece according to the following method, and the dispersion condition and the dynamic splitting performance of the carbon fiber in the concrete are observed:
the method for preparing the test piece comprises the following steps:
pouring the uniformly mixed mixture into a prepared mould, compacting by vibration of a vibration table, placing the mould in a standard curing room (the temperature is 20 +/-2 ℃, and the relative humidity is more than 95%) for 24h, then removing the mould from the test piece, continuously placing the test piece into the curing room for curing, preparing a thin cake-shaped test piece with the size of phi 50 multiplied by 25mm required by a dynamic split-pulling experiment by drilling, cutting and polishing when the age reaches 20 days, continuously placing the test piece into the curing room for curing to the age of 28 days, performing dynamic split-pulling test, and observing the dispersion condition of carbon fibers in concrete, wherein the method comprises the following steps:
(1) dynamic split tensile strength
And testing the dynamic split-pulling performance of the carbon fiber reinforced concrete by adopting a Hopkinson pressure bar device. Under the action of high-pressure nitrogen, the spindle-shaped punch impacts the incident rod and forms incident waves, the incident waves are split into two parts when being transmitted to the interface of the incident rod and the test piece, one part of the incident waves is reflected back to the incident rod to form reflected waves, and the other part of the incident waves penetrates through the test piece and enters the transmission rod to form transmission waves; incident waves and reflected waves are collected by the strain gauge a, and transmitted waves are collected by the strain gauge b; through the acquired incident wave signal, reflected wave signal and transmitted wave signal, the dynamic splitting tensile strength of the carbon fiber reinforced concrete can be calculated according to the formula (I):
Figure BDA0003322488570000081
in the formula: epsiloni(t)、εr(t) and εt(t) incident, reflected and transmitted strain pulses, respectively; eb、AbThe elastic modulus and the cross-sectional area of the compression bar are respectively; l, D are the thickness and diameter of the carbon fiber reinforced concrete test piece, respectively.
Fig. 1 is a graph showing a change rule of the dynamic split tensile strength of the carbon fiber reinforced concrete according to the strain rate in the embodiment and the comparative example of the present disclosure, and it can be seen from fig. 1 that the dynamic split tensile strength of the carbon fiber reinforced concrete increases according to the increase of the strain rate. When the doping amount of the carbon fiber is less than 0.6 wt%, the dynamic split tensile strength is increased along with the increase of the doping amount of the carbon fiber under the condition of similar strain rate, which shows that the dynamic split tensile strength of the concrete is improved by adding the carbon fiber, and the expansion of cracks in the concrete is effectively limited mainly due to the crack bridging effect of the carbon fiber. When the addition amount of the carbon fibers is 0.9 wt%, the dispersion uniformity of the carbon fibers in the concrete is reduced due to the excessively high addition amount of the carbon fibers, so that the inhibition effect on cracks is reduced, and the dynamic split tensile strength of the carbon fiber reinforced concrete begins to be reduced but is still greater than that of the reference group concrete (comparative example 1).
Meanwhile, as can be seen from fig. 1, the dynamic split tensile strength of the carbon fiber reinforced concrete is almost linearly increased along with the strain rate, so that the relationship between the dynamic split tensile strength and the strain rate of the carbon fiber reinforced concrete is represented by formula (II),
σdst＝aθ+b(II)
in the formula, σdstFor reinforcing carbon fibresDynamic modulus of elasticity, MPa, of the concrete; theta is the strain rate, s-1(ii) a a is a strain rate sensitivity coefficient, MPa.s; and b is a correlation coefficient, MPa.
The correlation coefficient of formula (II) obtained by the least squares calculation is shown in table 1, and the comparison between the fitting result of formula (II) and the test result is shown in fig. 1, and it can be seen from fig. 1 that the consistency between the calculation result of formula (II) and the test result is better.
TABLE 1
Figure BDA0003322488570000091
As can be seen from the variation of the parameter a in the table 1, the addition of the carbon fibers improves the strain rate sensitivity of the dynamic split tensile strength of the concrete, which is mainly attributed to that the crack bridging effect of the carbon fibers is more favorable for improving the shock resistance of the concrete, thereby improving the strain rate sensitivity of the dynamic split tensile strength of the concrete. Among them, the strain rate sensitivity is most remarkable when the addition amount of the carbon fiber is 0.6 wt%.
(B) Dynamic energy consumption
The dynamic energy consumption of the test piece can be calculated by formula (III):
Figure BDA0003322488570000092
in the formula, JdEnhancing the energy dissipated by the concrete test piece for the carbon fiber; j. the design is a squarei、Jr、JtEnergy carried by incident waves, reflected waves and transmitted waves respectively; cbIs the wave velocity in the strut.
Fig. 2 is a graph of a change rule of dynamic energy consumption of carbon fiber reinforced concrete along with a strain rate according to embodiments and comparative examples of the disclosure, and it can be seen from fig. 2 that the dynamic energy consumption of carbon fiber reinforced concrete increases non-linearly along with the strain rate, and when the doping amount of carbon fiber is less than 0.6 wt%, the dynamic energy consumption increases along with the increase of the doping amount of carbon fiber under the condition of similar strain rate; when the carbon fiber content is 0.9 wt%, the dynamic energy consumption begins to decrease due to the excessive carbon fiber content, but the dynamic energy consumption of CFC-0.9 is still significantly larger than that of the standard group concrete (comparative example 1) due to the crack inhibition effect of the carbon fiber.
The relationship between dynamic energy consumption and strain rate of carbon fiber reinforced concrete can be expressed by the following formula (IV):
Jd＝mln(θ)+n(IV)
in the formula, m is a strain rate sensitive coefficient of dynamic energy consumption, J & s; n is a correlation coefficient, JdThe energy is consumed dynamically.
The comparison between the fitting result of formula (IV) and the experimental result is shown in fig. 2, the calculation results of the relevant parameters in formula (IV) are shown in table 2, and it can be seen from fig. 2 that the calculation results of formula (IV) are better consistent with the experimental results.
TABLE 2
Figure BDA0003322488570000101
It can be seen from table 2 that the incorporation of carbon fibers also improves the strain rate sensitivity of the dynamic energy consumption of the concrete.
(C) Dispersion of carbon fiber
FIG. 3 is a graph of the distribution morphology of carbon fibers in 0.6% carbon fiber reinforced concrete in concrete provided in example 2 of the present disclosure; as can be seen from fig. 3, when the amount of the carbon fibers is moderate, the carbon fibers are dispersed in the concrete more uniformly, and when the concrete is cracked by splitting, the pulling-out length of the carbon fibers is smaller, which indicates that the bonding property between the carbon fibers and the concrete is better, which is very beneficial to improving the dynamic splitting performance of the concrete, and the pulling-out energy consumption of the carbon fibers also improves the dynamic energy consumption of the concrete. Fig. 4 is a dispersion morphology diagram of carbon fibers in 0.9% carbon fiber reinforced concrete provided in embodiment 3 of the present disclosure in concrete, and as can be seen from fig. 4, when the amount of the carbon fibers is large, the carbon fibers are easily accumulated in the concrete, and the dispersion uniformity is reduced, which not only reduces the adhesion property between the carbon fibers and the concrete matrix, but also easily introduces large bubbles during the mixing process of the mixture, reduces the dynamic splitting tensile strength of the concrete, but also promotes the dynamic splitting tensile property of the concrete by partially dispersing the carbon fibers relatively uniformly, so compared with the standard group concrete, the dynamic splitting tensile strength and dynamic energy consumption of CFC-0.9 are still large.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The carbon fiber reinforced concrete is characterized in that raw materials of the carbon fiber reinforced concrete consist of cement, river sand, broken stone, a water reducing agent, water and carbon fibers.
2. Carbon fibre reinforced concrete according to claim 1, characterized in that the carbon fibres are added in an amount of 0.3-0.9%, preferably 0.6% by weight of the cement.
3. The carbon fiber reinforced concrete according to claim 1 or 2, wherein the raw materials of the carbon fiber reinforced concrete comprise the following components in parts by weight:
Figure FDA0003322488560000011
4. the carbon fiber reinforced concrete according to claim 3, wherein the raw materials of the carbon fiber reinforced concrete comprise the following components in parts by weight:
Figure FDA0003322488560000012
5. the carbon fiber reinforced concrete according to claim 3, wherein the raw materials of the carbon fiber reinforced concrete comprise the following components in parts by weight:
Figure FDA0003322488560000013
Figure FDA0003322488560000021
6. the carbon fiber reinforced concrete according to claim 3, wherein the raw materials of the carbon fiber reinforced concrete comprise the following components in parts by weight:
Figure FDA0003322488560000022
7. carbon fibre reinforced concrete according to any one of claims 1 to 6, wherein the carbon fibres have a carbon content > 95 wt%, a diameter of 5-8 μm, a length of 3-5mm and a density > 1.6g/cm3。
8. Carbon fibre reinforced concrete according to any one of claims 1-7, wherein the cement is ordinary portland cement;
and/or the fineness modulus of the river sand is 2.7;
and/or the maximum particle size of the crushed stone is 20 mm;
and/or the water reducing agent is a polycarboxylate water reducing agent.
9. Method for the production of carbon fibre reinforced concrete according to any one of claims 1 to 8, characterized in that it comprises the following steps:
(1) mixing the carbon fiber with the formula amount and part of water and performing ultrasonic dispersion;
(2) mixing the cement, river sand and crushed stone according to the formula amount, and then adding water with half of the total water consumption for mixing;
(3) mixing the water reducing agent with the rest water according to the formula amount;
(4) and (3) further mixing the mixtures obtained in the steps (1) to (3) to obtain the carbon fiber reinforced concrete.
10. Use of the carbon fiber reinforced concrete of any one of claims 1-8 in airport runways, marine engineering structures or seismic protection structures.
CN202111250636.8A 2021-10-26 2021-10-26 Carbon fiber reinforced concrete and preparation method and application thereof Pending CN113929391A (en)

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Application publication date: 20220114