CN113105139B - Basalt fiber nano composite material for concrete and production process thereof - Google Patents

Basalt fiber nano composite material for concrete and production process thereof Download PDF

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CN113105139B
CN113105139B CN202110290661.2A CN202110290661A CN113105139B CN 113105139 B CN113105139 B CN 113105139B CN 202110290661 A CN202110290661 A CN 202110290661A CN 113105139 B CN113105139 B CN 113105139B
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张鸿浩
谢杰柱
桂红光
李家东
王海龙
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Wuhan Sanyuan Speical Building Materials Co Ltd
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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
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Structural Engineering (AREA)
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Abstract

The invention provides a basalt fiber nano composite material for concrete and a preparation method thereof. The basalt fiber nano composite material is prepared from the following components in percentage by mass: 8-15% of basalt fiber, 10-20% of nano silicon dioxide, 20-38% of nano calcium carbonate and 40-62% of an ultrafine mineral admixture. The invention also provides a preparation method of the basalt fiber nanocomposite, and the method modifies basalt fibers only by a physical mixing method through improving process equipment, so that the operation is simple, the raw material feeding and metering are accurate, the large-batch uniform mixing of basalt fibers and modified materials can be realized, the dispersibility of the basalt fiber nanocomposite is improved, the basalt fibers are prevented from agglomerating in the modification process, and meanwhile, the manual operation can be reduced.

Description

Basalt fiber nano composite material for concrete and production process thereof
Technical Field
The invention relates to a basalt fiber nano composite material for concrete and a production process thereof, belonging to the technical field of concrete admixtures.
Background
The cracking problem has been short slabs of concrete quality during use of the concrete. In 7 months 2014, the national building leakage condition survey project report published by the building waterproofing association of china in 2013 indicates that: 1022 underground building samples subjected to spot check have leakage in different degrees, and the leakage rate is as high as nearly 60%; in some areas, such as Chongqing and tin-free areas, the leakage rate of the underground structure even reaches 100 percent. In foreign countries, the early shrinkage cracking tendency of concrete has been studied in the United states and is included in ACBM (advanced center based materials) research project for Cement concrete in the new millennium. The difficulty in solving the cracking problem of concrete and the interest in concrete science are seen. Concrete itself is a brittle material, the strength of the hardened cement paste is derived from van der waals-like forces among fibrous hydration products, and the inter-particle connection strength is very low compared with ionic bonds, covalent bonds and metallic bonds, so that the crack resistance of the cement-based material is inherently insufficient. In addition, defective voids in concrete are a significant cause of insufficient strength and durability.
At present, in order to solve the problems of cracking and harmful pores of concrete, a method of adding fibers, an expanding agent and the like is generally adopted in engineering. The fiber is commonly used organic synthetic fiber and steel fiber, but the organic synthetic fiber has poor mechanical property, the tensile strength is generally not more than 1000MPa, the fiber has a certain effect on solving the problem of early plastic shrinkage, but the fiber is difficult to limit cracking in the later hardening stage. The use of steel fiber in general engineering is limited because of the inconvenience of its use process. The use of the expanding agent is matched with the shrinkage time curve of the concrete, and the shrinkage deformation of the concrete is compensated in stages and in the whole process. And for the concrete using the expanding agent, the maintenance should be strengthened, the establishment of sufficient pre-stress in the concrete is ensured, and the requirement on construction and maintenance is higher.
CN201610414707.6 discloses basalt fiber concrete, wherein the method for preparing basalt fibers comprises the following steps: after crushing and mixing 60-68 wt% of basalt, 7-11 wt% of coke, 10-12 wt% of dolomite and 11-19 wt% of slag, feeding the mixture into a cupola furnace for high-temperature melting, wherein the melting temperature is above 1470 ℃, the melt is guided to a fiber manufacturing device through a guide groove for fiber manufacturing, the filament outlet temperature of the fiber manufacturing device is 1450-1455 ℃, the blowing pressure is 0.5MPa, and basalt fibers with the length of 3-20mm are selected from the prepared basalt fibers. The method is characterized in that the raw materials are crushed and mixed firstly, and then the modified basalt fiber is prepared at high temperature, so that the operation process is complicated, the consumed energy is too high, and the requirement on equipment is too strict.
CN201410481965.7 discloses a method for coating basalt fiber filter material with modified polyphenylene sulfide/polytetrafluoroethylene in a layered manner, wherein basalt fibers are made into filter material base cloth, and modified polyphenylene sulfide emulsion, polytetrafluoroethylene emulsion and fluorine-containing silane coupling agent are mixed to prepare primer; dipping the filter material base cloth in the primer, curing at high temperature, and cooling along with a furnace to prepare a primer; spraying the surface coating on the surface of the bottom layer by a spray gun, and plasticizing at high temperature to obtain a finished product. The basalt fiber composite filter material prepared by the method can improve the dispersibility of finished fibers, and is suitable for large-scale industrial production. However, the method modifies the basalt fibers by a chemical method, needs a large amount of chemical substances in industrial scale production, is not friendly to the personal safety and the environment of operators, has more treatment steps, and increases the operation difficulty and the safety risk.
Disclosure of Invention
In order to solve the problem that concrete is easy to crack, the invention provides a basalt fiber nano composite material for concrete. Meanwhile, in order to solve the problem of the dispersibility of the basalt fiber nanocomposite material, the invention also provides a preparation method of the basalt fiber nanocomposite material. According to the method, the technological equipment is improved, and the basalt fiber is modified only by a physical mixing method, so that the operation is simple, the raw material feeding and metering are accurate, the large-batch basalt fiber and the modified material can be uniformly mixed, the dispersibility of the basalt fiber nanocomposite is improved, the basalt fiber is prevented from agglomerating in the modification process, and meanwhile, the manual operation can be reduced.
In order to achieve the purpose, the basalt fiber nano composite material provided by the invention is prepared from the following components in parts by weight: 8-15% of basalt fiber, 10-20% of nano silicon dioxide, 20-38% of nano calcium carbonate and 40-62% of an ultrafine mineral admixture.
Preferably, the basalt fibers are short cut filaments with the diameter of 18-22 mu m and the length of 22 mm.
Preferably, the particle size of the nano silicon dioxide is 30-80 nm.
Preferably, the particle size of the nano calcium carbonate is 80-120 nm.
Preferably, the specific surface area of the superfine mineral admixture is 600-750 m 2 /kg。
Preferably, the ultrafine mineral admixture is one or more of ultrafine fly ash, ultrafine mineral powder and ultrafine gypsum which are mixed according to any mass percentage.
The preparation method of the basalt fiber nanocomposite material for concrete comprises the following steps:
s1: putting the basalt fibers into a feeding station, lifting the basalt fibers to a weighing scale through a hoist, weighing the basalt fibers, then feeding the basalt fibers into a mixing machine, simultaneously operating a high-speed fly cutter and the mixing machine, wherein the rotating speed of the high-speed fly cutter is 1800-2100 r/min, the rotating speed of the mixing machine is 100-130 r/min, and stirring for 2-6 minutes to completely disperse the bunched fibers in the mixing machine;
s2: putting the nano silicon dioxide and the nano calcium carbonate into a feeding station, lifting the nano silicon dioxide and the nano calcium carbonate to a weighing scale by a lifter, then putting the nano silicon dioxide and the nano calcium carbonate into the mixing machine in the step S1, simultaneously operating the high-speed fly cutter and the mixing machine, wherein the rotating speed of the high-speed fly cutter is 1800-2100 r/min, the rotating speed of the mixing machine is 100-130 r/min, and stirring the mixture of the basalt fibers, the nano silicon dioxide and the nano calcium carbonate for 3-5 minutes;
s3: and (2) putting the superfine mineral admixture into a feeding station, lifting the superfine mineral admixture to a weighing scale by a lifter for quantification, then putting the mixture into a mixing machine, simultaneously operating a high-speed fly cutter mixing machine, stirring the basalt fiber, nano-silica, nano-calcium carbonate and superfine mineral admixture mixture for 10-15 minutes at the high-speed fly cutter rotation speed of 1800-2100 r/min and the mixing machine rotation speed of 100-130 r/min, uniformly mixing, and then discharging the mixture into a buffer bin to obtain the basalt fiber nano-composite material for concrete.
The hoisting machine can be a Z-type hoisting machine or a spiral hoisting machine; the weighing scale can be a 14-head combined scale or a spiral weighing scale; the mixer may be a gravimetric mixer or other mixer capable of meeting the mixing conditions.
Preferably, the high-speed fly cutter rotating speed is 2000r/min in steps S1, S2 and S3, and the mixer rotating speed is 120 r/min.
Preferably, the measuring scale and the interior of the hoisting machine are sprayed with polytetrafluoroethylene with the thickness of 25 μm.
The invention has the beneficial effects that: (1) the tensile strength of the basalt fiber adopted in the invention reaches more than 3000MPa, the basalt fiber has better mechanical property, is high temperature resistant and corrosion resistant, is a novel green high-performance fiber prepared from natural basalt, can inhibit the shrinkage cracking of concrete in a whole service life when being applied to the concrete, and improves the crack resistance. Meanwhile, the crystal nucleus effect, the filling effect and the high activity of the nano active material and the superfine mineral admixture are assisted, so that the cracking of the concrete can be effectively avoided, and the compactness is improved. (2) The basalt fiber material with high mechanical property forms a three-dimensional disorderly-supported lap joint system in concrete, so that the shrinkage stress of the concrete is effectively dispersed, and the cracking risk is reduced. The graded nano silicon dioxide, nano calcium carbonate and the superfine mineral admixture are formed, are filled and hydrated in the concrete, provide crystallization nucleation points, enable the concrete to be more uniform and dense, and improve the mechanical strength and durability. (3) By improving the process equipment, the basalt fiber is modified only by a physical mixing method, so that the operation is simple, the raw material feeding and metering are accurate, the large-batch basalt fiber and the modified material are uniformly mixed, the dispersity of the basalt fiber nanocomposite can be improved, and the basalt fiber is prevented from agglomerating in the modification process.
Drawings
FIG. 1 is an apparatus used in the preparation of basalt fiber nanocomposite material of example 1.
In the figure: 1. a feeding station; 2. a screw elevator; 3. a spiral weighing scale; 4. a 14-head combination scale; 5. a Z-type hoist; 6. a gravity-free mixer; 7. flying the cutter at a high speed; 8. buffer the feed bin.
Detailed Description
The technical solution of the present invention is described in detail and fully with reference to the following examples, it is obvious that the described examples are only a part of the examples of the present invention, and not all of the examples. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention. Any equivalent changes or substitutions by those skilled in the art according to the following embodiments are within the scope of the present invention.
Example 1
The basalt fiber nano composite material for concrete in the embodiment is prepared from the following components in parts by weight: 8% of basalt fiber, 15% of nano-silica, 25% of nano-calcium carbonate and 52% of superfine mineral admixture. Wherein the ultrafine mineral admixture comprises 23% of ultrafine mineral powder, 39% of ultrafine fly ash and 38% of ultrafine gypsum according to mass percentage.
The preparation method of the basalt fiber nano composite material comprises the following steps:
s1: as shown in figure 1, the basalt fiber chopped strand with the diameter of 18-22 μm and the length of 22mm is put into a feeding station 1, lifted to a 14-head combination scale 4 by a Z-type lifter 5, weighed and then enters a gravity-free mixer 6, and a high-speed fly cutter 7 and the gravity-free mixer 6 are operated at the same time; the rotating speed of the high-speed fly cutter 7 is 2000r/min, the rotating speed of the gravity-free mixer 6 is 120r/min, and the cluster-shaped fibers are completely dispersed in the mixer after being stirred for 3 minutes;
s2: putting the nano silicon dioxide with the particle size of 30-80 nm and the nano calcium carbonate with the particle size of 80-120 nm into a feeding station 1, lifting the nano silicon dioxide and the nano calcium carbonate to a spiral metering scale 3 through a spiral elevator 2, weighing the nano silicon dioxide and the nano calcium carbonate, putting the weighed nano silicon dioxide and the weighed nano calcium carbonate into a gravity-free mixer 6 in the step S1, and simultaneously operating a high-speed fly cutter 7 and the gravity-free mixer 6; the rotating speed of the high-speed fly cutter is 2000r/min, the rotating speed of the gravity-free mixer 6 is 120r/min, and the mixture of the basalt fiber, the nano-silica and the nano-calcium carbonate is stirred for 3 minutes;
s3: the specific surface area is 600 to 750m 2 Putting/kg of superfine mineral admixture into a feeding station 1, lifting the superfine mineral admixture to a spiral metering scale 3 by a spiral lifter 2, then putting the superfine mineral admixture into a gravity-free mixer 6, and simultaneously operating a high-speed fly cutter 7 and the gravity-free mixer 6; the speed of the high-speed fly cutter 7 is 2000r/min, the speed of the gravity-free mixer 6 is 120r/min, the basalt fiber, nano-silica, nano-calcium carbonate and superfine mineral admixture mixture is stirred for 10 minutes, and the mixture is evenly mixed and then fed into a buffer bin 8, so that the basalt fiber nanocomposite material for concrete is obtained.
Example 2
The basalt fiber nanocomposite material for concrete in the embodiment is prepared from the following components in parts by weight: 10% of basalt fiber, 12% of nano-silica, 38% of nano-calcium carbonate and 40% of superfine mineral admixture. Wherein the superfine mineral admixture consists of 35 percent of superfine mineral powder, 32.5 percent of superfine fly ash and 32.5 percent of superfine gypsum according to mass percentage.
The preparation method of the basalt fiber nanocomposite material of this example is the same as that of example 1.
Example 3
The basalt fiber nanocomposite material for concrete in the embodiment is prepared from the following components in parts by weight: 15% of basalt fiber, 20% of nano-silica, 20% of nano-calcium carbonate and 45% of superfine mineral admixture. Wherein the ultrafine mineral admixture comprises 33.3 percent of ultrafine mineral powder, 33.3 percent of ultrafine fly ash and 33.4 percent of ultrafine gypsum according to mass percentage.
The preparation method of the basalt fiber nanocomposite material of this example is the same as that of example 1.
Example 4
The basalt fiber nanocomposite material for concrete in the embodiment is prepared from the following components in parts by weight: 8% of basalt fiber, 10% of nano-silica, 20% of nano-calcium carbonate and 62% of superfine mineral admixture. Wherein the ultrafine mineral admixture comprises 37 percent of ultrafine mineral powder, 37 percent of ultrafine fly ash and 26 percent of ultrafine gypsum according to mass percentage.
The preparation method of the basalt fiber nanocomposite material of this example is the same as that of example 1.
Example 5
This example differs from example 1 in that: the high-speed fly rotor 7 in steps S1, S2 and S3 has a speed of 1800r/min, and the rotational speed of the gravity-free mixer 6 is 100 r/min. The mixing time in step S1 was 6 minutes, the mixing time in step S2 was 5 minutes, and the mixing time in step S3 was 15 minutes.
Example 6
This example differs from example 1 in that: the preparation method of the basalt fiber nanocomposite material of this example is different from example 1 in that the speeds of the high-speed fly cutter 7 in steps S1, S2, and S3 are all 2100r/min, and the rotational speed of the gravity-free mixer 6 is 130 r/min. The mixing time in step S1 was 2 minutes, the mixing time in step S2 was 4 minutes, and the mixing time in step S3 was 12 minutes.
Comparative example 1
The basalt fiber nano composite material for concrete of the comparative example is prepared from the following components in percentage by weight: 6% of basalt fiber, 17% of nano-silica, 25% of nano-calcium carbonate and 52% of superfine mineral admixture. Wherein the superfine mineral admixture consists of 23 percent of superfine mineral powder, 39 percent of superfine fly ash and 38 percent of superfine gypsum according to mass percentage.
The preparation method of the basalt fiber nanocomposite material is the same as that of example 1.
Comparative example 2
The basalt fiber nano composite material for concrete of the comparative example is prepared from the following components in percentage by weight: 18% of basalt fiber, 17% of nano-silica, 20% of nano-calcium carbonate and 45% of superfine mineral admixture. Wherein the ultrafine mineral admixture comprises 33.3 percent of ultrafine mineral powder, 33.3 percent of ultrafine fly ash and 33.4 percent of ultrafine gypsum according to mass percentage.
The preparation method of the basalt fiber nanocomposite material is the same as that of the basalt fiber nanocomposite material in example 1.
Comparative example 3
The composition of the basalt fiber nanocomposite material for concrete of the present comparative example is the same as that of example 1, except that the preparation method of the basalt fiber nanocomposite material is as follows:
s1: as shown in fig. 1, nano silica with a particle size of 30 to 80nm and nano calcium carbonate with a particle size of 80 to 120nm are put into a feeding station 1, lifted to a screw weigher 3 by a screw elevator 2, weighed and then put into a non-gravity mixer 6, and a high-speed fly cutter 7 and the non-gravity mixer 6 are operated at the same time; the rotating speed of the high-speed fly cutter is 2000r/min, the rotating speed of the gravity-free mixer 6 is 120r/min, and the mixture of the nano silicon dioxide and the nano calcium carbonate is stirred for 3 minutes;
s2: throwing the basalt fiber chopped strands with the diameter of 18-22 mu m and the length of 22mm into a feeding station 1, hoisting the basalt fiber chopped strands to a 14-head combination scale 4 by a Z-type hoist 5, weighing the basalt fiber chopped strands, entering a gravity-free mixer 6 in the step S1, and simultaneously operating a high-speed fly cutter 7 and the gravity-free mixer 6; the rotating speed of the high-speed fly cutter 7 is 2000r/min, the rotating speed of the gravity-free mixer 6 is 120r/min, and the mixture of the clustered basalt fibers, the nano-silica and the nano-calcium carbonate is stirred for 3 minutes;
s3: the specific surface area is 600-750 m 2 The ultra-fine mineral admixture of/kg is put into a feeding station 1 and passes through a screw elevator2, lifting the mixture to a spiral metering scale 3 for quantifying, then putting the mixture into a gravity-free mixer 6, and simultaneously operating a high-speed fly cutter 7 and the gravity-free mixer 6; the speed of the high-speed fly cutter 7 is 2000r/min, the rotating speed of the gravity-free mixer 6 is 120r/min, the basalt fiber, nano-silica, nano-calcium carbonate and superfine mineral admixture are stirred for 10 minutes, and the mixture is evenly mixed and then fed into a buffer bin 8, so that the basalt fiber nanocomposite material for concrete is obtained.
Comparative example 4
The composition of the basalt fiber nanocomposite material for concrete of the present comparative example is the same as that of example 1, except that the preparation method of the basalt fiber nanocomposite material is as follows:
s1: as shown in fig. 1, nano silica with a particle size of 30 to 80nm and nano calcium carbonate with a particle size of 80 to 120nm are put into a feeding station 1, lifted to a screw weigher 3 by a screw elevator 2, weighed and then put into a non-gravity mixer 6, and a high-speed fly cutter 7 and the non-gravity mixer 6 are operated at the same time; the rotating speed of the high-speed fly cutter is 2000r/min, the rotating speed of the gravity-free mixer 6 is 120r/min, and the mixture of the nano silicon dioxide and the nano calcium carbonate is stirred for 3 minutes;
s2: the specific surface area is 600 to 750m 2 Putting/kg of superfine mineral admixture into a feeding station 1, lifting the superfine mineral admixture to a spiral metering scale 3 by a spiral lifter 2, then putting the superfine mineral admixture into a gravity-free mixer 6, and simultaneously operating a high-speed fly cutter 7 and the gravity-free mixer 6; the speed of the high-speed fly cutter 7 is 2000r/min, the speed of the non-gravity mixer 6 is 120r/min, the mixture of the nano silicon dioxide, the nano calcium carbonate and the superfine mineral admixture is stirred for 3 minutes,
s3: throwing the basalt fiber chopped strands with the diameter of 18-22 mu m and the length of 22mm into a feeding station 1, hoisting the basalt fiber chopped strands to a 14-head combination scale 4 by a Z-type hoisting machine 5, weighing the basalt fiber chopped strands, feeding the basalt fiber chopped strands into a gravity-free mixer 6, and simultaneously operating a high-speed fly cutter 7 and the gravity-free mixer 6; the rotating speed of the high-speed fly cutter 7 is 2000r/min, the rotating speed of the gravity-free mixer 6 is 120r/min, and the mixture of the bunched basalt fibers, the nano-silica and the nano-calcium carbonate is stirred for 10 minutes.
In order to test the performance of the basalt fiber nanocomposite materials in examples 1 to 6 and comparative examples 1 to 4, 20kg of each of the basalt fiber nanocomposite materials prepared in examples 1 to 6 and comparative examples 1 to 4 was added to a reference concrete, and the compressive strength of the concrete at 7d and 28d was measured according to the relevant provisions in the test method Standard for physical and mechanical Properties of concrete (GB/T50081-2019); according to relevant regulations in the test method Standard for the Long-term Performance and durability of ordinary concrete (GB/T50082-2009), the cracking resistance of the concrete is measured and is characterized by a crack reduction coefficient eta. The fracture reduction coefficient η is calculated as follows:
Figure BDA0002982438210000071
wherein, C k As the total crack area (mm) per unit area of the reference concrete 2 /m 2 ) To the accuracy of 1mm 2 /m 2 ；C s The total area of cracks (mm) per unit area of the concrete to which the basalt fiber nanocomposite material was added in examples 2 /m 2 ) To the accuracy of 1mm 2 /m 2 。
The formulation of the reference concrete is shown in table 1, and the test results of the reference concrete and the concrete prepared by adding the basalt fiber nanocomposite material of examples 1 to 6 and comparative examples 1 to 4 are shown in table 2.
TABLE 1 Standard concrete component ratio Table
Figure BDA0002982438210000072
TABLE 2 Performance test data of concrete with basalt fiber nanocomposites in each of examples and comparative examples added
Figure BDA0002982438210000073
Figure BDA0002982438210000081
According to the test results, compared with the standard concrete without any fiber, the 7d compressive strength of the concrete doped with the basalt fiber nanocomposite material can be improved by more than 15.4 percent, and the 28d compressive strength can be improved by more than 18.7 percent; the crack reduction coefficient is more than 89%. Compared with the embodiment 1, the basalt fiber nano composite material in the comparative example 1 has the advantages that the content of basalt fibers is reduced, the content of nano silicon dioxide is increased, the compressive strength of concrete is obviously reduced, and the crack resistance is obviously reduced. Compared with the embodiment 3, the basalt fiber nano composite material of the comparative example 2 has the advantages that the content of basalt fibers is increased, the content of nano silicon dioxide is reduced, the compressive strength of concrete is obviously reduced, and the crack resistance is obviously reduced. Compared with the embodiment 1, the preparation method of the basalt fiber nanocomposite material is changed in the comparative example 3 and the comparative example 4, so that the compressive strength and the crack resistance of the concrete are obviously reduced, and particularly the reduction amplitude of the comparative example 4 is the largest. The method is characterized in that the bunched basalt fiber is dispersed firstly, and then the surface of the bunched basalt fiber is modified by using the nano silicon dioxide and the nano calcium carbonate, so that the dispersibility of the basalt fiber can be improved, and the inherent performances of the basalt fiber and other raw materials can be exerted to the maximum extent; after the preparation method is changed, the dispersibility of the basalt fiber is poor, and the basalt fiber is easy to agglomerate, so that the effect of the nano silicon dioxide and the nano calcium carbonate on the surface modification is not obvious. When the adding amount of the basalt fiber is too small, the crack resistance of the concrete is not remarkably improved; when the addition amount of the basalt fiber is too large, the dispersibility of the basalt fiber in concrete is poor, the workability and the homogeneity of the concrete are poor, the strength and the durability of the concrete are reduced, and even a concrete delivery pump is easily blocked. Therefore, when the components of the basalt fiber nano composite material prepared by the preparation method are in a limited range, the compressive strength and the crack resistance of concrete are improved best.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The present invention may be subject to various modifications and changes by any person skilled in the art. Any simple equivalent changes and modifications made in accordance with the protection scope of the present application and the content of the specification are intended to be included within the protection scope of the present invention.

Claims (7)

1. The basalt fiber nano composite material for concrete is characterized by being prepared from the following components in parts by weight: 8-15% of basalt fiber, 10-20% of nano silicon dioxide, 20-38% of nano calcium carbonate and 40-62% of an ultrafine mineral admixture; the tensile strength of the basalt fiber is more than or equal to 3000 MPa; the superfine mineral admixture is one or more of superfine fly ash, superfine mineral powder and superfine gypsum which are mixed according to any mass percentage;
the preparation method of the basalt fiber nano composite material for the concrete comprises the following steps:
s1: putting the basalt fibers into a feeding station, lifting the basalt fibers to a weighing scale by a lifter, weighing the basalt fibers, then feeding the basalt fibers into a mixing machine, simultaneously operating a high-speed fly cutter and the mixing machine, wherein the rotating speed of the high-speed fly cutter is 1800-2100 r/min, the rotating speed of the mixing machine is 100-130 r/min, and stirring for 2-6 minutes to completely disperse the bunched fibers in the mixing machine;
s2: putting the nano silicon dioxide and the nano calcium carbonate into a feeding station, lifting the nano silicon dioxide and the nano calcium carbonate to a weighing scale by a lifter, then putting the nano silicon dioxide and the nano calcium carbonate into the mixing machine in the step S1, simultaneously operating the high-speed fly cutter and the mixing machine, wherein the rotating speed of the high-speed fly cutter is 1800-2100 r/min, the rotating speed of the mixing machine is 100-130 r/min, and stirring the mixture of the basalt fibers, the nano silicon dioxide and the nano calcium carbonate for 3-5 minutes;
s3: putting the superfine mineral admixture into a feeding station, lifting the superfine mineral admixture to a weighing scale for quantification through a lifter, then feeding the superfine mineral admixture into a mixing machine, simultaneously operating a high-speed fly-cutter mixing machine, stirring the basalt fiber, nano-silica, nano-calcium carbonate and superfine mineral admixture mixture for 10-15 minutes at the high-speed fly-cutter rotation speed of 1800-2100 r/min and the mixing machine rotation speed of 100-130 r/min, uniformly mixing, and then discharging the mixture to a buffer bin to obtain the basalt fiber nano-composite material for concrete.
2. The basalt fiber nanocomposite material for concrete according to claim 1, wherein the basalt fiber is a short filament with a diameter of 18 to 22 μm and a length of 22 mm.
3. The basalt fiber nanocomposite material for concrete according to claim 1, wherein the nano silica has a particle size of 30 to 80 nm.
4. The basalt fiber nanocomposite material for concrete according to claim 1, wherein the nano calcium carbonate has a particle size of 80 to 120 nm.
5. The basalt fiber nanocomposite material for concrete according to claim 1, wherein the ultrafine mineral admixture has a specific surface area of 600 to 750m 2 /kg。
6. The basalt fiber nanocomposite material for concrete according to claim 1, wherein the high-speed fly cutter rotation speeds in the steps S1, S2, and S3 are all 2000r/min, and the mixer rotation speed is all 120 r/min.
7. The basalt fiber nanocomposite material for concrete according to claim 1, wherein the weigher and the elevator are each coated with 25 μm-thick polytetrafluoroethylene.
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