CN117756484A - Cement adhesive for rapidly testing strength of porcelain insulator porcelain piece, and preparation method and application thereof - Google Patents
Cement adhesive for rapidly testing strength of porcelain insulator porcelain piece, and preparation method and application thereof Download PDFInfo
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- CN117756484A CN117756484A CN202311752693.5A CN202311752693A CN117756484A CN 117756484 A CN117756484 A CN 117756484A CN 202311752693 A CN202311752693 A CN 202311752693A CN 117756484 A CN117756484 A CN 117756484A
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- 239000004568 cement Substances 0.000 title claims abstract description 130
- 229910052573 porcelain Inorganic materials 0.000 title claims abstract description 87
- 239000000853 adhesive Substances 0.000 title claims abstract description 85
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 85
- 239000012212 insulator Substances 0.000 title claims abstract description 28
- 238000012360 testing method Methods 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- HPTYUNKZVDYXLP-UHFFFAOYSA-N aluminum;trihydroxy(trihydroxysilyloxy)silane;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O[Si](O)(O)O HPTYUNKZVDYXLP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052621 halloysite Inorganic materials 0.000 claims abstract description 28
- 239000004576 sand Substances 0.000 claims abstract description 28
- 150000004645 aluminates Chemical class 0.000 claims abstract description 25
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000002274 desiccant Substances 0.000 claims abstract description 21
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 75
- 239000000377 silicon dioxide Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 12
- 239000011230 binding agent Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 229910021487 silica fume Inorganic materials 0.000 claims description 4
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 3
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 3
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Inorganic materials [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 claims description 3
- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical group Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052710 silicon Inorganic materials 0.000 abstract description 2
- 239000010703 silicon Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- 238000010521 absorption reaction Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 239000000843 powder Substances 0.000 description 9
- 238000007906 compression Methods 0.000 description 8
- 230000006835 compression Effects 0.000 description 8
- -1 polypropylene Polymers 0.000 description 8
- 239000004743 Polypropylene Substances 0.000 description 7
- 229910001570 bauxite Inorganic materials 0.000 description 7
- 239000013530 defoamer Substances 0.000 description 7
- 239000000835 fiber Substances 0.000 description 7
- 229920001155 polypropylene Polymers 0.000 description 7
- 238000006703 hydration reaction Methods 0.000 description 6
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 235000012239 silicon dioxide Nutrition 0.000 description 6
- 238000005245 sintering Methods 0.000 description 6
- 239000005995 Aluminium silicate Substances 0.000 description 5
- 235000012211 aluminium silicate Nutrition 0.000 description 5
- 239000011449 brick Substances 0.000 description 5
- 239000002270 dispersing agent Substances 0.000 description 5
- 230000036571 hydration Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000010453 quartz Substances 0.000 description 5
- 238000009472 formulation Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- 239000006004 Quartz sand Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000002086 nanomaterial Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 3
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical group [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 3
- 238000001694 spray drying Methods 0.000 description 3
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 229920002125 Sokalan® Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 239000004584 polyacrylic acid Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 235000019832 sodium triphosphate Nutrition 0.000 description 2
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The invention provides a cement adhesive for rapidly testing the strength of porcelain insulator porcelain pieces, and a preparation method and application thereof. The cement adhesive comprises the following components in percentage by weight: 40-60 wt% of aluminate cement, 30-50 wt% of artificial porcelain sand, 2-5 wt% of halloysite and 1-5 wt% of silicon micropowder, wherein the cement adhesive further comprises an externally doped anticracking agent, a water reducing agent, a quick drying agent and a defoaming agent, and the externally doped amounts of the anticracking agent, the water reducing agent, the quick drying agent and the defoaming agent are respectively 0.1-0.3 wt%, 0.1-0.5 wt% and 0.1-0.3 wt%. The cement adhesive greatly shortens the period of intensity detection of the porcelain insulator, and can be shortened to 1d from the current detection time of 7 d.
Description
Technical Field
The invention relates to the technical field of electric extra-high voltage, in particular to cement adhesive for rapidly testing the strength of porcelain insulator porcelain pieces, and a preparation method and application thereof.
Background
In ultra-high voltage and extra-high voltage engineering of a national power grid, a composite insulator, a glass insulator and a porcelain insulator are generally applied. The porcelain insulator is widely applied to ultra-high voltage engineering because of excellent properties such as corrosion resistance, high strength and the like of porcelain pieces. Compared with other two insulators, the unique performance of the insulator greatly ensures the safety and reliability of extra-high voltage circuit engineering. The porcelain insulator mainly comprises porcelain pieces, cement adhesive and hardware fittings. In the production process, in order to detect whether the strength of the porcelain piece is qualified, cement adhesive is often required to be glued in the porcelain piece, after the porcelain piece is cured for 7 days, the strength of the cement adhesive is improved to be more than 90MPa, and then the mechanical property of the porcelain piece is tested, if the strength of the cement adhesive is too low, the cement adhesive is often broken to break the porcelain piece, and the actual strength of the porcelain piece cannot be truly reflected. The main reason is that the cement binder is prepared by using silicate cement as a cementing material and adding filling material river sand or quartz sand and water, and the strength of the cement binder needs to be enough maintenance time to reach 90MPa, and generally needs 7d or more. In addition, lead-tin alloy is directly cast after being melted, but the preparation process is complex, and the process is hardly used in practical factories. The most widely used portland cement cements are currently used.
At present, cement adhesive for porcelain insulation test is required to reach more than 90MPa, and is often cured for 7d or longer, and in the porcelain insulator manufacturing process, the period for detecting the strength of porcelain pieces is overlong, so that the product delivery period is influenced, and the production efficiency is further influenced. Therefore, it is necessary to further shorten the detection period of the strength of the porcelain.
Disclosure of Invention
The invention provides a cement adhesive for rapidly testing the strength of porcelain insulator porcelain pieces and a preparation method and application thereof. The cement adhesive greatly shortens the period of intensity detection of the porcelain insulator, and can be shortened to 1d from the current detection time of 7 d.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the cement adhesive for rapidly testing the strength of the porcelain insulator porcelain piece comprises the following components in percentage by weight: 40-60 wt% of aluminate cement, 30-50 wt% of artificial porcelain sand, 2-5 wt% of halloysite and 1-5 wt% of silica micropowder, wherein the cement adhesive further comprises an externally doped anticracking agent, a water reducing agent, a quick drying agent and a defoaming agent, and the externally doped amounts of the anticracking agent, the water reducing agent, the quick drying agent and the defoaming agent are respectively 0.1-0.3 wt%, 0.1-0.5 wt% and 0.1-0.3 wt%.
Preferably, the halloysite has a nano tubular structure, the purity is more than 96wt%, the diameter is 30-80nm, and the length is 1 mu m.
Preferably, the aluminate cement is CA80 cement.
Preferably, the main component of the silicon micropowder is spherical silicon dioxide, the purity is more than 99 weight percent, and the fineness is 10-120 nm.
Preferably, the quick-drying agent is lithium sulfate, lithium carbonate or a combination of the lithium sulfate and the lithium carbonate.
Preferably, the anticracking agent is polypropylene fiber with the length of 6mm and the length-diameter ratio of 5-10.
Preferably, the water reducer is a polycarboxylic acid type water reducer with the concentration of 50 weight percent.
Preferably, the defoamer is a silicone defoamer.
Preferably, the grain size of the artificial porcelain sand is 30-120 meshes, the content of alumina is more than 70wt percent, and Fe 2 O 3 <2wt％。
Preferably, the preparation method of the artificial porcelain sand comprises the following steps:
ball milling wet mixing bauxite, water washing kaolin, quartz powder and a dispersing agent, and then spray drying to form balls;
adding a plasticizer, drying and sintering after dry pressing into green bricks, cooling, crushing and screening to obtain the artificial porcelain sand.
Preferably, the mass ratio of the bauxite to the water-washed kaolin to the quartz powder is 40-70:20-30:5-15.
Preferably, the dispersing agent is sodium hexametaphosphate, polyacrylic acid or sodium tripolyphosphate, preferably sodium hexametaphosphate, and the mixing amount of the dispersing agent is 0.3-0.4wt% of the total mass of bauxite, water-washed kaolin and quartz powder.
Preferably, the particle size after spray drying and balling is 0.2-0.5 mm.
Preferably, the plasticizer is polyvinyl alcohol or carboxymethyl cellulose, and the mixing amount is 0.2-0.3 wt%.
Preferably, the dry-pressed green bricks are dry-pressed at a pressure of 100-130 MPa.
Preferably, the drying is performed at 110-120 ℃ for 20-40 h.
Preferably, the content of alumina in the bauxite is 40-70 wt%, and the bauxite is added with water and ground to remove iron, so that the iron content is controlled below 2 wt%.
Preferably, the sintering temperature is 1600-1800 ℃ and 10-20 h.
The preparation method of the cement adhesive comprises the following steps: premixing aluminate cement, artificial porcelain sand, an anticracking agent, halloysite and silica micropowder to obtain a premix, adding a water reducing agent, a quick drying agent and a defoaming agent into the premix, and adding water to stir for 6-8min until stirring uniformly to obtain the cement adhesive.
The application of the cement adhesive in the rapid strength test of porcelain insulator porcelain pieces is as follows: pouring the cement adhesive into a porcelain piece, standing for 3-4h, and drying at 100-120 ℃ for 18-20h to obtain the cement adhesive for testing.
Preferably, the compressive strength of the cement adhesive 1d is more than 100MPa, and the flexural strength is more than 15 MPa.
The invention also provides application of the cement adhesive in the extra-high voltage large-tonnage disc-shaped suspension porcelain insulator. The extra-high voltage is divided into extra-high voltage alternating current and extra-high voltage direct current, and the extra-high voltage alternating current (UHV) refers to voltages of 1000kV and above. Extra-high voltage direct current refers to voltages of + -800 kV and above. Large tonnage refers to an insulator with rated tension of 420KN or more.
In the hydration reaction process of the aluminate cement, the aluminate cement generates hydration products (such as CAH 10 、C 2 AH 8 And C 3 AH 6 ) These hydration products are interlaced with each other and encapsulate the particles, giving the castable high strength. During the curing process, the hydration product of aluminate cement is formed by CAH 10 And C 2 AH 8 To C 3 AH 6 Phase transition, which is accompanied by volume shrinkage, increases the porosity, resulting in a decrease in the material bond strength. Whereas halloysite is added, because the crystal composition of halloysite is monoclinic system silicate mineral with water-containing lamellar structure, the crystal structure is similar to kaolinite, and the cement hydration product CAH 10 、C 2 AH 8 And C 3 AH 6 And the like, has good compatibility, and the like, in addition, the unique nano-tubular structure and the important hydration product AH of aluminate cement 3 The gel fills the pores among the crystal frames together to form a compact structure, and the synergistic effect ensures the cement adhesive to have good early strength and high strength.
Compared with the prior art, the invention has the beneficial effects that:
aluminate cement is adopted to replace silicate cement, and halloysite is simultaneously used for doping, which is different from the traditional natural curing system, and a baking process is adopted, so that the 1d strength of the cement adhesive can reach more than 100 MPa; the halloysite with a nano structure is used as a reinforcing material, so that the flexural strength of the cement adhesive is greatly improved, and the curing time of the cement adhesive is greatly shortened by adopting the concrete quick-drying agent. The invention has the advantages of simple technical scheme, convenient construction operation, capability of enabling the strength of the cement adhesive to be more than 100MPa within 1d, greatly shortening the detection period of the strength of the porcelain piece, shortening the original test period from more than 7d to less than 1d and greatly improving the production period and efficiency of the product.
Drawings
Fig. 1 is an SEM image of synthetic artificial porcelain sand, and it can be seen from the image that the prepared artificial porcelain sand has compact structure, small porosity and 15-20 μm size, and the structure of the structure endows cement adhesive with high compressive strength and flexural strength.
From the SEM image of the spherical silica powder of fig. 2, it can be seen that the silica powder is spherical in shape and has a size of 10-120 nm, and the structure enables the adhesive to have good flowing property.
FIG. 3 is an SEM image of halloysite, from which the nanotube-like structure is evident, having a diameter of 80nm and a length of 1. Mu.m. Such nanostructures help to increase the flexural strength of the glue.
Fig. 4 is a cross-sectional view of the baked cement paste. The figure shows that the synthesized cement adhesive has high density, even aggregate distribution and almost no air holes.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides cement adhesive for rapidly testing the strength of porcelain insulator porcelain pieces, which comprises the following components in percentage by weight: 40-60 wt% of aluminate cement, 15-50 wt% of artificial porcelain sand, 2-5 wt% of halloysite and 1-5 wt% of silica micropowder; 0.1 to 0.3 weight percent of polypropylene fiber is taken as an anticracking agent, and 0.1 to 0.3 weight percent of polycarboxylic acid is taken as a water reducing agent; adding 0.1-0.5 wt% quick-drying agent; 0.1 to 0.3 weight percent of defoamer is added.
Premixing aluminate cement, artificial porcelain sand, an anticracking agent, halloysite and silica micropowder for 8-10 min according to the weight percentage, obtaining a premix, adding a water reducing agent, a quick drying agent and a defoaming agent into the premix, adding water, stirring for 5min uniformly, wherein the water adding amount is such that the water cement ratio is 0.15, obtaining the cement adhesive, pouring the cement adhesive into a porcelain piece, standing for 4h, and drying at 100-120 ℃ for 18-20h, thus testing.
Specifically, the aluminate cement adopts CA80 cement, aggregate is synthetic artificial porcelain sand, and is different from the river sand and quartz sand which are used at present, the main components of the aluminate cement are alumina and mullite, the aluminate cement has more stable performance than the river sand and quartz sand, has excellent toughness, has no potential hazard of alkali aggregate reaction, and greatly improves the long-term service life and safety of cement adhesive. The adopted halloysite with the nano structure greatly improves the flexural strength of the cement adhesive, and in addition, the adopted high-purity spherical silica powder has small addition amount and good fluidity, and the high density is beneficial to the long-term stability and the operation safety of the cement adhesive and even the porcelain insulator. In addition, polypropylene fiber is used as an anticracking agent, a high-efficiency water reducing agent and a certain amount of defoaming agent are added, so that generation of large bubbles is reduced. In conclusion, the cement adhesive prepared by the invention has excellent performance and short curing time, is beneficial to the rapid detection of the strength of the porcelain insulator, and greatly improves the production efficiency.
The preparation method of the artificial porcelain sand comprises the following steps:
bauxite is used as a raw material, water is added for grinding, iron is removed, the iron content is controlled below 2%, and water-washed kaolin, quartz powder, dispersing agent and the like are added for ball milling wet mixing. Bauxite: kaolin: quartz powder = 40-70 wt%: 20-30 wt%: 5-15 wt%. The dispersant is sodium hexametaphosphate, polyacrylic acid, sodium tripolyphosphate and the like, so that the whole system materials are more uniform after being mixed. Wet mixing the raw materials for more than 20 hours, uniformly mixing the raw materials in the whole slurry, performing spray drying to form balls, adding a certain amount of plasticizing agent such as polyvinyl alcohol or carboxymethyl cellulose with the particle size of 0.2-0.5 mm, performing dry pressing under the pressure of 100MPa to form a green brick, drying at 110 ℃ for more than 20 hours, and placing the green brick in a tunnel kiln for sintering according to a certain sintering process, wherein the highest sintering temperature is more than 1600 ℃ and the highest sintering temperature is more than 10 hours. And (3) after cooling, placing the green bricks into a crusher for crushing, screening, and selecting 30-70 mesh particles to obtain the required artificial porcelain sand.
Specific examples and comparative examples of the present invention are shown in table 1 below:
TABLE 1
Note that: 1. portland cement cements are naturally cured.
2. The water-cement ratio in the experiment is the same.
The experimental results of the specific examples and comparative examples of the present invention are shown in table 2 below:
TABLE 2
Example 1
The embodiment provides a cement adhesive for rapidly testing the strength of porcelain insulator porcelain pieces: 60 weight percent of aluminate cement, 30 weight percent of artificial porcelain sand, 5 weight percent of halloysite and 5 weight percent of high-purity silica micropowder. 0.1 weight percent of polypropylene fiber with the total weight is added as an anticracking agent, and 0.1 weight percent of water reducer is added; 0.1wt% quick drying agent; 0.2wt% defoamer. And premixing aluminate cement, artificial porcelain sand, an anticracking agent, halloysite and high-purity silica micropowder according to the percentage content to obtain a premix, adding a water reducing agent, a quick drying agent and a defoaming agent into the premix, adding water and stirring for 5min uniformly to obtain the cement adhesive, pouring the cement adhesive into a porcelain piece, standing for 4h, baking at 110 ℃ for 20h, demoulding, curing to a specified age, and testing the performance of the porcelain piece.
The compressive strength of the 1d cement adhesive is 103.5MPa, the flexural strength is 16.5MPa, the compressive strength of the 11d cement adhesive is 112.0MPa, the flexural strength is 21.6MPa, the dry shrinkage rate of 11d is 0.04%, and the 11d elastic modulus is 42.1GPa. The water absorption of the adhesive is 3.8%, the compression expansion rate is 0.04%, the fluidity is more than 300mm, the adhesive belongs to self-leveling, and the specification of the existing cement adhesive is met.
Example 2
The embodiment provides a cement adhesive for rapidly testing the strength of porcelain insulator porcelain pieces: 50wt% of aluminate cement, 45wt% of artificial porcelain sand, 2wt% of halloysite and 3wt% of high-purity silica micropowder. 0.2 weight percent of polypropylene fiber with the total weight is added as an anticracking agent, and 0.2 weight percent of water reducer is added; 0.2wt% quick drying agent; 0.2wt% defoamer. And premixing aluminate cement, artificial porcelain sand, an anticracking agent, halloysite and high-purity silica micropowder according to the percentage content to obtain a premix, adding a water reducing agent, a quick drying agent and a defoaming agent into the premix, adding water and stirring for 5min uniformly to obtain the cement adhesive, pouring the cement adhesive into a porcelain piece, standing for 4h, baking at 110 ℃ for 20h, demoulding, curing to a specified age, and testing the performance of the porcelain piece.
The compressive strength of the 1d cement adhesive is 106.5MPa, the flexural strength is 17.4MPa, the compressive strength of the 11d cement adhesive is 115.5MPa, the flexural strength is 22.8MPa, the dry shrinkage rate of 11d is 0.04%, and the 11d elastic modulus is 45.4GPa. The water absorption of the cement is 3.5%, the compression expansion rate is 0.05%, the fluidity is 260mm, and the cement meets the specifications of the existing cement.
Example 3
The embodiment provides a cement adhesive for rapidly testing the strength of porcelain insulator porcelain pieces: 45wt% of aluminate cement, 49wt% of artificial porcelain sand, 2wt% of halloysite and 4wt% of high-purity silica micropowder. 0.1 weight percent of polypropylene fiber with the total weight is added as an anticracking agent, and 0.1 weight percent of water reducer is added; 0.1wt% quick drying agent; 0.2wt% defoamer. And premixing aluminate cement, artificial porcelain sand, an anticracking agent, halloysite and high-purity silica micropowder according to the percentage content to obtain a premix, adding a water reducing agent, a quick drying agent and a defoaming agent into the premix, adding water and stirring for 5min uniformly to obtain the cement adhesive, pouring the cement adhesive into a porcelain piece, standing for 4h, baking at 110 ℃ for 20h, demoulding, curing to a specified age, and testing the performance of the porcelain piece.
The compressive strength of the 1d cement adhesive is 109.2MPa, the flexural strength is 20.6MPa, the compressive strength of the 11d cement adhesive is 123.7MPa, the flexural strength is 24.3MPa, the dry shrinkage rate of 11d is 0.05%, and the 11d elastic modulus is 47.8GPa. The water absorption of the cement is 3.5%, the compression expansion rate is 0.06%, the fluidity is 270mm, and the cement meets the specifications of the existing cement.
Example 4
The embodiment provides a cement adhesive for rapidly testing the strength of porcelain insulator porcelain pieces: 40wt% of aluminate cement, 53wt% of artificial porcelain sand, 2wt% of halloysite and 5wt% of high-purity silica micropowder. 0.1 weight percent of polypropylene fiber with the total weight is added as an anticracking agent, and 0.3 weight percent of water reducer is added; 0.3wt% quick drying agent; 0.3wt% defoamer. And premixing aluminate cement, artificial porcelain sand, an anticracking agent, halloysite and high-purity silica micropowder according to the percentage content to obtain a premix, adding a water reducing agent, a quick drying agent and a defoaming agent into the premix, adding water and stirring for 5min uniformly to obtain the cement adhesive, pouring the cement adhesive into a porcelain piece, standing for 4h, baking at 110 ℃ for 20h, demoulding, curing to a specified age, and testing the performance of the porcelain piece.
The compressive strength of the 1d cement adhesive is 112.4MPa, the flexural strength is 22.5MPa, the compressive strength of the 11d cement adhesive is 125.6MPa, the flexural strength is 25.8MPa, the dry shrinkage rate of 11d is 0.05%, and the 11d elastic modulus is 49.6GPa. The water absorption of the cement is 3.2%, the compression expansion rate is 0.05%, the fluidity is 280mm, and the cement meets the specifications of the existing cement.
Comparative example 1
The main formulation and process of this comparative example was the same as in example 1, except that 60wt% Portland cement, ordinary 92% silica fume, was used, and halloysite was not added.
The compressive strength of the 1d cement adhesive is 35.2MPa, the flexural strength is 4.5MPa, the compressive strength of the 11d cement adhesive is 90.4MPa, the flexural strength is 7.8MPa, the dry shrinkage rate of the 11d cement adhesive is 0.09%, and the 11d elastic modulus is 36.5GPa. The water absorption of the adhesive is 5.5%, the compression expansion rate is 0.08%, the fluidity is 210mm, the compressive strength and the flexural strength of 1d are obviously lower than those of the adhesive in the example 1, and the adhesive cannot be used for testing the strength of porcelain pieces.
Comparative example 2
The main formulation and process of this comparative example were the same as in example 1, except that the aggregate was plain river sand, plain 92% silica fume, and no halloysite was added.
The compressive strength of the 1d cement adhesive is 80.4MPa, the flexural strength is 6.8MPa, the compressive strength of the 11d cement adhesive is 97.8MPa, the flexural strength is 9.6MPa, the dry shrinkage rate of the 11d cement adhesive is 0.07%, and the 11d elastic modulus is 32.8GPa. The cement has a water absorption of 5.8%, an expansion by compression of 0.09%, a fluidity of 220mm, and a compressive strength and flexural strength of 1d which are significantly lower than those of example 1, in particular, a compressive strength of less than 90MPa, so that the strength of the porcelain cannot be tested.
Comparative example 3
The main formulation and process of this comparative example was the same as in example 1, except that the normal 92% silica fume was used without halloysite.
The compressive strength of the 1d cement adhesive is 92.6MPa, the flexural strength is 8.5MPa, the compressive strength of the 11d cement adhesive is 101.4MPa, the flexural strength is 12.8MPa, the dry shrinkage rate of 11d is 0.06%, and the 11d elastic modulus is 40.9GPa. The water absorption of the adhesive is 4.0%, the compression expansion rate is 0.06%, the fluidity is 200mm, the compressive strength and the flexural strength of 1d are lower than those of the adhesive in the example 1, and although the strength can meet the requirements of porcelain testing, the fluidity is small, so that the viscosity is high, and the practical use of the adhesive is affected.
Comparative example 4
The main formulation and process of this comparative example were the same as in example 1, except that halloysite was not added, and the amount of the high-purity fine silica powder was 10wt%.
The compressive strength of the 1d cement adhesive is 85.2MPa, the flexural strength is 10.5MPa, the compressive strength of the 11d cement adhesive is 91.7MPa, the flexural strength is 13.4MPa, the dry shrinkage rate of 11d is 0.08%, and the 11d elastic modulus is 39.2GPa. The water absorption of the adhesive is 4.2%, the compression expansion rate is 0.07%, the fluidity is more than 300mm, and the adhesive is self-leveling. 11d is lower in compressive strength and flexural strength than in example 1, and is higher in dry shrinkage and water absorption than in example 1. The overall performance was lower than in example 1.
The above examples are presented for clarity of illustration only and are not limiting of the embodiments. Other variations and modifications of the above description will be apparent to those of ordinary skill in the art, and it is not necessary or exhaustive of all embodiments, and thus all obvious variations or modifications that come within the scope of the invention are desired to be protected.
Claims (10)
1. The cement adhesive for rapidly testing the strength of the porcelain insulator porcelain piece is characterized by comprising the following components in percentage by weight: 40-60 wt% of aluminate cement, 30-50 wt% of artificial porcelain sand, 2-5 wt% of halloysite and 1-5 wt% of silica micropowder, wherein the cement adhesive further comprises an externally doped anticracking agent, a water reducing agent, a quick drying agent and a defoaming agent, and the externally doped amounts of the anticracking agent, the water reducing agent, the quick drying agent and the defoaming agent are respectively 0.1-0.3 wt%, 0.1-0.5 wt% and 0.1-0.3 wt%.
2. The cement paste of claim 1, wherein the halloysite is a nano-tubular structure,
the diameter is 30-80nm.
3. The cement binder of claim 1 wherein the halloysite is >96wt% pure.
4. The cement binder of claim 1 wherein the aluminate cement is CA80 cement.
5. The cement binder of claim 1 wherein the silica fume has a major component of spherical silica with a purity of >99wt% and a fineness of 10-120 nm.
6. The cement binder of claim 1 wherein the quick-drying agent is lithium sulfate, lithium carbonate, or a combination thereof.
7. The cement binder of claim 1, wherein the artificial porcelain sand has a particle size of 30 to 120 mesh, an alumina content of 70wt% or more, and Fe 2 O 3 <2wt％。
8. The method of preparing a cement paste according to any of claims 1 to 7, wherein the method is: premixing aluminate cement, artificial porcelain sand, an anticracking agent, halloysite and silica micropowder to obtain a premix, adding a water reducing agent, a quick drying agent and a defoaming agent into the premix, and adding water and uniformly stirring to obtain the cement adhesive.
9. The use of the cement paste obtained by the method for preparing the cement paste according to claim 8 in the rapid strength test of porcelain insulator porcelain pieces, wherein the use is as follows: pouring the cement adhesive into a porcelain piece, standing for 3-4h, and drying at 100-120 ℃ for 18-20h to obtain the cement adhesive for testing.
10. The use according to claim 9, wherein the cement binder 1d has a compressive strength of more than 100MPa and a flexural strength of more than 15 MPa.
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