CN117756481A - Carbon nano tube modified polymer repair material and preparation method and application thereof - Google Patents
Carbon nano tube modified polymer repair material and preparation method and application thereof Download PDFInfo
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- CN117756481A CN117756481A CN202311838525.8A CN202311838525A CN117756481A CN 117756481 A CN117756481 A CN 117756481A CN 202311838525 A CN202311838525 A CN 202311838525A CN 117756481 A CN117756481 A CN 117756481A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 239000002041 carbon nanotube Substances 0.000 title claims abstract description 88
- 229910021393 carbon nanotube Inorganic materials 0.000 title claims abstract description 88
- 239000000463 material Substances 0.000 title claims abstract description 87
- 230000008439 repair process Effects 0.000 title claims abstract description 76
- 229920000642 polymer Polymers 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000006004 Quartz sand Substances 0.000 claims abstract description 32
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 32
- 239000013530 defoamer Substances 0.000 claims abstract description 27
- 239000002893 slag Substances 0.000 claims abstract description 25
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 24
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 23
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 23
- 239000011398 Portland cement Substances 0.000 claims abstract description 21
- 239000004567 concrete Substances 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims description 84
- 238000003756 stirring Methods 0.000 claims description 60
- 238000002156 mixing Methods 0.000 claims description 49
- 229920005646 polycarboxylate Polymers 0.000 claims description 16
- 239000003469 silicate cement Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- 238000007580 dry-mixing Methods 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 239000002518 antifoaming agent Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims 11
- 238000000034 method Methods 0.000 claims 3
- 239000004576 sand Substances 0.000 claims 3
- 239000000377 silicon dioxide Substances 0.000 claims 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000004568 cement Substances 0.000 abstract description 7
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000002114 nanocomposite Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a carbon nanotube modified polymer repair material, and a preparation method and application thereof, and belongs to the technical field of concrete structure repair. The carbon nano tube modified polymer repair material comprises the following components in parts by mass: 60-90 parts of Portland cement, 17.5-32.5 parts of blast furnace slag, 3-10 parts of ethylene-vinyl acetate copolymer, 0.15-0.6 part of carbon nano tube, 17.5-32.5 parts of silica fume, 125-170 parts of quartz sand, 0.1-0.5 part of defoamer, 0.4-0.8 part of water reducer and 15-30 parts of water; the components of the cement-based repairing material are synergistic by the polymer and the carbon nano tube, so that the mechanical property and the adhesive property of the cement-based repairing material are improved.
Description
Technical Field
The invention belongs to the technical field of concrete structure repair, and particularly relates to a carbon nano tube modified polymer repair material, and a preparation method and application thereof.
Background
With the extension of the service life of the building structure, most old and damaged concrete structures need to be repaired and reinforced to continue normal use. The cement-based material and the old concrete are considered to have good compatibility, so that the cement-based material and the old concrete are the main repairing materials. However, a weak interface transition area is easily formed between the traditional silicate cement-based material and the old concrete, so that the bonding strength between the traditional silicate cement-based material and the old concrete is reduced, and the reinforcing layer falls off. However, although the existing organic repairing materials with more uses have stronger bonding strength, the materials generally have the defects of large brittleness, low mechanical strength and easy aging property when in actual use, so that the application range of the materials is limited. Although the ordinary silicate cement mortar has good compatibility and mechanical strength with the old concrete matrix as a repair material, the silicate cement has the problem of low bonding strength, and is easy to fall off when being applied to the old concrete as a repair material.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a carbon nano tube modified polymer repair material, and a preparation method and application thereof, which are used for solving the technical problems of poor bonding performance of inorganic materials, poor durability of organic repair materials and the like at present.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the invention discloses a carbon nano tube modified polymer repair material which comprises the following components in parts by mass: 60-90 parts of Portland cement, 17.5-32.5 parts of blast furnace slag, 3-10 parts of ethylene-vinyl acetate copolymer, 0.15-0.6 part of carbon nano tube, 17.5-32.5 parts of silica fume, 125-170 parts of quartz sand, 0.1-0.5 part of defoamer, 0.4-0.8 part of water reducer and 15-30 parts of water;
wherein the carbon nanotubes are carboxylated carbon nanotubes; the water reducer is a polycarboxylate water reducer.
Further, the solid content of the polycarboxylate water reducer is 40%.
Further, the defoamer is an organosilicon defoamer.
Further, the quartz sand with the grain diameter of 0.7-1.2mm, the quartz sand with the grain diameter of 0.42-0.7mm and the quartz sand with the grain diameter of 0.2-0.42mm are mixed according to the following proportion of 1:0.56: and 0.67 by mass.
The invention also discloses a preparation method of the carbon nanotube modified polymer repair material, which comprises the following steps:
s1: mixing silicate cement, silica fume, blast furnace slag and ethylene-vinyl acetate copolymer according to the weight portion ratio to obtain a first mixture;
s2: mixing the carbon nano tube, the water reducing agent, the defoaming agent and water according to the weight portion to obtain a second mixture;
s3: and mixing the first mixture and the second mixture, adding quartz sand, and stirring to obtain the carbon nano tube modified polymer repair material.
In the step S1, the mixing mode is dry mixing, and the time of the dry mixing is 3-5 min.
In the step S2, the mixing mode is ultrasonic and stirring mixing, and the time of ultrasonic and stirring mixing is 15-18 min.
Further, in S3, after the first mixture and the second mixture are mixed and stirred for 4-10 min, quartz sand is added and stirred for 5-15 min.
The invention also discloses application of the carbon nanotube modified polymer repair material, and the carbon nanotube modified polymer repair material is used as a repair material for repairing and reinforcing concrete.
Further, when the carbon nano tube modified polymer repair material is adopted for repairing and reinforcing concrete, the bonding strength formed by repairing the carbon nano tube modified polymer repair material is 1.77-2.43 MPa, and the flexural strength is 13.6-17.8 MPa.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a carbon nano tube modified polymer repair material, wherein the components of the material can fill the internal pores of the repair material through carbon nano tubes, so that the porosity is reduced. Meanwhile, the carbon nano tube inhibits crack development by promoting hydration reaction and bridging pores, and improves the mechanical property of concrete. In addition, the polymer can improve the bending strength of the repair material, and active groups in molecules of the polymer can also react with the cement-based repair material to improve the physical structure of the repair material. Therefore, the synergistic effect of the carbon nano tube and the polymer can improve the compactness of the cement-based repair material, improve the fracture toughness and refine the pore structure, so that the mechanical property and the adhesive property of the cement are improved.
Detailed Description
So that those skilled in the art can appreciate the features and effects of the present invention, a general description and definition of the terms and expressions set forth in the specification and claims follows. Unless otherwise defined, 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 invention belongs, and in the event of a conflict, the present specification shall control.
The theory or mechanism described and disclosed herein, whether right or wrong, is not meant to limit the scope of the invention in any way, i.e., the present disclosure may be practiced without limitation to any particular theory or mechanism.
All features such as values, amounts, and concentrations that are defined herein in the numerical or percent ranges are for brevity and convenience only. Accordingly, the description of a numerical range or percentage range should be considered to cover and specifically disclose all possible sub-ranges and individual values (including integers and fractions) within the range.
Herein, unless otherwise indicated, "comprising," "including," "having," or similar terms encompass the meanings of "consisting of … …" and "consisting essentially of … …," e.g., "a includes a" encompasses the meanings of "a includes a and the other and" a includes a only.
In this context, not all possible combinations of the individual technical features in the individual embodiments or examples are described in order to simplify the description. Accordingly, as long as there is no contradiction between the combinations of these technical features, any combination of the technical features in the respective embodiments or examples is possible, and all possible combinations should be considered as being within the scope of the present specification.
The invention provides a carbon nano tube modified polymer repair material which is prepared from the following raw materials in parts by weight: 60-90 parts of silicate cement, 17.5-32.5 parts of blast furnace slag, 3-10 parts of ethylene-vinyl acetate copolymer, 0.15-0.6 part of carbon nano tube, 17.5-32.5 parts of silica fume, 125-170 parts of quartz sand, 0.1-0.5 part of defoamer, 0.4-0.8 part of water reducer and 15-30 parts of water.
Preferably, the Portland cement has a grade of 42.5.
Preferably, the grade of the blast furnace slag is grade S105.
Preferably, the water reducer is a polycarboxylate water reducer with a solid content of 40%.
Preferably, the carbon nanotubes are carboxylated carbon nanotubes.
Preferably, the defoamer is a silicone defoamer.
Preferably, the mass ratio of the quartz sand with the particle size of 0.7-1.2mm to the quartz sand with the particle size of 0.42-0.7mm to the quartz sand with the particle size of 0.2-0.42mm is 1:0.56:0.67.
the preparation method adopted by the invention comprises the following steps:
and weighing silicate cement, silica fume and blast furnace slag according to the proportion, and carrying out dry mixing and uniform mixing to obtain the first concrete mixture.
And weighing the carbon nano tube, the water reducing agent, the defoaming agent and water according to the proportion, and carrying out ultrasonic and stirring mixing to obtain a second mixture.
And (3) mixing and stirring the first mixture and the second mixture obtained in the steps for 4 minutes, adding quartz sand and stirring to obtain a concrete repairing material, pouring the concrete repairing material into a mould containing old concrete, vibrating and compacting, and obtaining a concrete repairing test piece after normal temperature standard maintenance is carried out for 28 days.
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
The following examples use instrumentation conventional in the art. The experimental methods, in which specific conditions are not noted in the following examples, are generally conducted under conventional conditions or under conditions recommended by the manufacturer. The following examples used various starting materials, unless otherwise indicated, were conventional commercial products, the specifications of which are conventional in the art. In the description of the present invention and the following examples, "%" means weight percent, and "parts" means parts by weight, and ratios means weight ratio, unless otherwise specified.
Example 1
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 87.5 parts of Portland cement, 18.8 parts of blast furnace slag, 18.8 parts of silica fume and 3 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.3 part of carboxylated carbon nano tube, 0.3 part of defoamer, 0.6 part of polycarboxylate water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 125 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 2
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 87.5 parts of Portland cement, 18.8 parts of blast furnace slag, 18.8 parts of silica fume and 3 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.5 part of carboxylated carbon nano tube, 0.3 part of defoamer, 0.6 part of polycarboxylate water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 125 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 3
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 87.5 parts of Portland cement, 18.8 parts of blast furnace slag, 18.8 parts of silica fume and 5 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.3 part of carboxylated carbon nano tube, 0.3 part of defoamer, 0.6 part of polycarboxylate water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 125 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 4
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 60 parts of Portland cement, 32.5 parts of blast furnace slag, 32.5 parts of silica fume and 5 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.15 part of carboxylated carbon nano tube, 0.1 part of defoamer, 0.4 part of polycarboxylate water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 125 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 5
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 60 parts of Portland cement, 32.5 parts of blast furnace slag, 32.5 parts of silica fume and 5 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.3 part of carboxylated carbon nano tube, 0.2 part of defoamer, 0.5 part of polycarboxylate water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 125 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 6
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 60 parts of Portland cement, 32.5 parts of blast furnace slag, 32.5 parts of silica fume and 5 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.6 part of carboxylated carbon nano tube, 0.5 part of defoamer, 0.8 part of polycarboxylate water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 125 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 7
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 90 parts of Portland cement, 17.5 parts of blast furnace slag, 17.5 parts of silica fume and 5 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.6 part of carboxylated carbon nano tube, 0.5 part of defoamer, 0.8 part of polycarboxylate water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 125 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 8
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 60 parts of Portland cement, 32.5 parts of blast furnace slag, 32.5 parts of silica fume and 10 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.3 part of carboxylated carbon nano tube, 0.2 part of defoamer, 0.5 part of polycarboxylate water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 125 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 9
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 90 parts of Portland cement, 17.5 parts of blast furnace slag, 17.5 parts of silica fume and 5 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.3 part of carboxylated carbon nano tube, 0.2 part of defoamer, 0.5 part of polycarboxylate water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 125 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 10
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 90 parts of Portland cement, 17.5 parts of blast furnace slag, 17.5 parts of silica fume and 5 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.6 part of carboxylated carbon nano tube, 0.4 part of defoamer, 0.7 part of polycarboxylate water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 125 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 11
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 90 parts of Portland cement, 17.5 parts of blast furnace slag, 17.5 parts of silica fume and 10 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.3 part of carboxylated carbon nano tube, 0.3 part of defoamer, 0.5 part of water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 125 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 12
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 87.5 parts of Portland cement, 18.8 parts of blast furnace slag, 18.8 parts of silica fume and 5 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.3 part of carboxylated carbon nano tube, 0.2 part of defoamer, 0.8 part of water reducer and 15 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 125 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 13
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 87.5 parts of Portland cement, 18.8 parts of blast furnace slag, 18.8 parts of silica fume and 5 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.3 part of carboxylated carbon nano tube, 0.3 part of defoamer, 0.6 part of water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 170 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 14
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 87.5 parts of Portland cement, 18.8 parts of blast furnace slag, 18.8 parts of silica fume and 5 parts of ethylene-vinyl acetate copolymer for 5min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.3 part of carboxylated carbon nano tube, 0.3 part of defoamer, 0.6 part of water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 170 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 15
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 87.5 parts of Portland cement, 18.8 parts of blast furnace slag, 18.8 parts of silica fume and 5 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.3 part of carboxylated carbon nano tube, 0.3 part of defoamer, 0.6 part of water reducer and 30 parts of water for 18min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 10min, adding 170 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
Example 16
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 87.5 parts of Portland cement, 18.8 parts of blast furnace slag, 18.8 parts of silica fume and 5 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.3 part of carboxylated carbon nano tube, 0.3 part of defoamer, 0.6 part of water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 170 parts of quartz sand, and stirring for 15min to obtain the carbon nano tube modified polymer repair material.
Comparative example 1
A preparation method of a carbon nano tube modified polymer repair material comprises the following steps:
s1: mixing 87.5 parts of Portland cement, 18.8 parts of blast furnace slag, 18.8 parts of silica fume and 3 parts of ethylene-vinyl acetate copolymer for 3min to obtain a first mixture;
s2: carrying out ultrasonic and stirring mixing on 0.1 part of carboxylated carbon nano tube, 0.3 part of defoamer, 0.6 part of polycarboxylate water reducer and 30 parts of water for 15min to obtain a second mixture;
s3: stirring the first mixture and the second mixture for 4min, adding 125 parts of quartz sand, and stirring for 5min to obtain the carbon nano tube modified polymer repair material.
The polymer nano-repair materials prepared in comparative example 1, example 2 and example 3 were measured for flexural strength according to the standard JGJ/T70-2009 test method, and the concrete repair test piece was measured for tensile bond strength according to the standard GB/T50081-2002 test method, and the measured data are shown in table 1.
TABLE 1 Performance test data for Polymer nanocomposites prepared in comparative example 1, examples 1-3
As can be seen from table 1, an increase in the carbon nanotube content can improve the flexural strength and the adhesive strength of the repair material. However, when an excessive amount of carbon nanotubes is added, agglomeration of carbon nanotubes may result in a decrease in the bonding strength and the flexural strength. The bonding strength can be effectively improved by adding the polymer on the basis.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. The carbon nano tube modified polymer repair material is characterized by comprising the following components in parts by mass: 60-90 parts of Portland cement, 17.5-32.5 parts of blast furnace slag, 3-10 parts of ethylene-vinyl acetate copolymer, 0.15-0.6 part of carbon nano tube, 17.5-32.5 parts of silica fume, 125-170 parts of quartz sand, 0.1-0.5 part of defoamer, 0.4-0.8 part of water reducer and 15-30 parts of water;
wherein the carbon nanotubes are carboxylated carbon nanotubes; the water reducer is a polycarboxylate water reducer.
2. The carbon nanotube-modified polymer repair material of claim 1 wherein the polycarboxylate water reducer has a solids content of 40%.
3. The carbon nanotube-modified polymeric repair material of claim 1 wherein the defoamer is a silicone defoamer.
4. The carbon nanotube-modified polymer repair material according to claim 1, wherein the silica sand having a particle size of 0.7 to 1.2mm, the silica sand having a particle size of 0.42 to 0.7mm, and the silica sand having a particle size of 0.2 to 0.42mm are mixed according to 1:0.56: and 0.67 by mass.
5. The method for producing a carbon nanotube-modified polymer repair material according to any one of claims 1 to 4, comprising the steps of:
s1: mixing silicate cement, silica fume, blast furnace slag and ethylene-vinyl acetate copolymer according to the weight portion ratio to obtain a first mixture;
s2: mixing the carbon nano tube, the water reducing agent, the defoaming agent and water according to the weight portion to obtain a second mixture;
s3: and mixing the first mixture and the second mixture, adding quartz sand, and stirring to obtain the carbon nano tube modified polymer repair material.
6. The method for preparing a carbon nanotube-modified polymer repair material according to claim 5, wherein in S1, the mixing mode is dry mixing, and the dry mixing time is 3 min-5 min.
7. The method for preparing a carbon nanotube-modified polymer repair material according to claim 5, wherein in S2, the mixing is performed by ultrasonic and stirring, and the time of ultrasonic and stirring is 15 min-18 min.
8. The method for preparing a carbon nanotube-modified polymer repair material according to claim 5, wherein in S3, the first mixture and the second mixture are mixed and stirred for 4 to 10 minutes, and then quartz sand is added and stirred for 5 to 15 minutes.
9. The use of the carbon nanotube-modified polymer repair material according to any one of claims 1 to 4, as a repair material for repairing and reinforcing concrete.
10. The use of the carbon nanotube-modified polymer repair material according to claim 9, wherein the bonding strength formed by repairing the carbon nanotube-modified polymer repair material is 1.77 to 2.43MPa and the flexural strength is 13.6 to 17.8MPa when the carbon nanotube-modified polymer repair material is used for repairing and reinforcing concrete.
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