CN116023094A - High-performance concrete and preparation method thereof - Google Patents
High-performance concrete and preparation method thereof Download PDFInfo
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- CN116023094A CN116023094A CN202211683765.0A CN202211683765A CN116023094A CN 116023094 A CN116023094 A CN 116023094A CN 202211683765 A CN202211683765 A CN 202211683765A CN 116023094 A CN116023094 A CN 116023094A
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- 239000004574 high-performance concrete Substances 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 162
- 239000002893 slag Substances 0.000 claims abstract description 77
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 76
- 239000004113 Sepiolite Substances 0.000 claims abstract description 65
- 229910052624 sepiolite Inorganic materials 0.000 claims abstract description 65
- 235000019355 sepiolite Nutrition 0.000 claims abstract description 65
- 239000000843 powder Substances 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000006229 carbon black Substances 0.000 claims abstract description 20
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 claims abstract description 20
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000010881 fly ash Substances 0.000 claims abstract description 9
- 239000000314 lubricant Substances 0.000 claims abstract description 9
- 239000002270 dispersing agent Substances 0.000 claims abstract description 8
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 7
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 30
- 239000000243 solution Substances 0.000 claims description 26
- 239000011259 mixed solution Substances 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- RRIWRJBSCGCBID-UHFFFAOYSA-L nickel sulfate hexahydrate Chemical compound O.O.O.O.O.O.[Ni+2].[O-]S([O-])(=O)=O RRIWRJBSCGCBID-UHFFFAOYSA-L 0.000 claims description 10
- 229940116202 nickel sulfate hexahydrate Drugs 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 239000000725 suspension Substances 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 claims description 7
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000002203 pretreatment Methods 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 229920005551 calcium lignosulfonate Polymers 0.000 claims description 3
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 claims description 3
- 229920001732 Lignosulfonate Polymers 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 2
- 238000000967 suction filtration Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 76
- 230000000694 effects Effects 0.000 abstract description 2
- 239000012615 aggregate Substances 0.000 description 30
- 239000011148 porous material Substances 0.000 description 15
- 239000000203 mixture Substances 0.000 description 10
- 230000000740 bleeding effect Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 239000011372 high-strength concrete Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses high-performance concrete and a preparation method thereof, wherein the high-performance concrete is prepared from the following raw materials in parts by weight: and (3) cement: 250-300 parts; coarse aggregate: 1050-1150 parts; fine aggregate: 650-700 parts; fly ash: 150-200 parts; water: 70-120 parts; water reducing agent: 4-8 parts of a lubricant; modified sepiolite: 30-60 parts; nickel slag powder: 20-40 parts of a lubricant; triethanolamine: 10-20 parts of a lubricant; the modified sepiolite comprises sepiolite, carbon black, titanium tetrachloride, ethanol, a dispersing agent and ammonia water. The application has the effect of improving the compressive strength of concrete.
Description
Technical Field
The invention relates to the field of concrete, in particular to high-performance concrete and a preparation method thereof.
Background
The concrete is usually obtained by mixing cement as gel material, sand and stone as aggregate, water and additive according to a certain proportion, and mechanically stirring. The concrete has the advantages of easy forming, low energy consumption, good durability, low price and capability of being combined with steel to form various bearing mechanisms, is the most widely applied building material in the current generation, and plays an important role in the development of human society.
However, the use range of the common concrete is seriously affected and limited due to the fact that the common concrete has high brittleness, low compressive strength and the like. Meanwhile, for low-strength concrete, the cement consumption is large when the same functions are met, so that the consumption of natural resources and energy sources is increased, the emission of waste gas and dust is increased, and the energy source requirement and the environmental pollution are increased.
Disclosure of Invention
In order to improve the compressive strength of concrete, the application provides high-performance concrete and a preparation method thereof.
In a first aspect, the present application provides a high-performance concrete adopting the following technical scheme:
the high-performance concrete is prepared from the following raw materials in parts by weight:
and (3) cement: 250-300 parts;
coarse aggregate: 1050-1150 parts;
fine aggregate: 650-700 parts;
fly ash: 150-200 parts;
water: 70-120 parts;
water reducing agent: 4-8 parts of a lubricant;
modified sepiolite: 30-60 parts;
nickel slag powder: 20-40 parts of a lubricant;
triethanolamine: 10-20 parts of a lubricant;
the modified sepiolite comprises sepiolite, carbon black, titanium tetrachloride, ethanol, a dispersing agent and ammonia water.
By adopting the technical scheme, the high-strength concrete can be prepared by adopting the raw materials of the concrete, and the cement, the coarse aggregate, the fine aggregate, the water and the fly ash are mutually matched, and then the water reducer is matched, so that the dosage of mixing water can be reduced, and the workability of the concrete is improved; the sepiolite has a continuous silicon oxygen tetrahedron layer and has good adsorption capacity, the sepiolite is modified, carbon black and titanium tetrachloride are attached to the surface of the sepiolite after being reacted, and the modified sepiolite tightly connects coarse aggregate and fine aggregate, so that the compressive strength of concrete is improved; the nickel slag powder can better fill the pores among various components of the concrete; the triethanolamine can control the concrete to have certain fluidity and promote the preparation of high-performance concrete.
Preferably, the preparation method of the modified sepiolite comprises the following steps: mixing and stirring 10-20 parts by weight of titanium tetrachloride and 5-10 parts by weight of ethanol to obtain a mixed solution; mixing and stirring 10-20 parts by weight of sepiolite, 5-10 parts by weight of dispersing agent, 10-20 parts by weight of carbon black and 5-10 parts by weight of ethanol to obtain suspension; adding the mixed solution into the suspension, fully mixing, then dripping 1-3 parts by weight of ammonia water, adjusting the pH to 7-8, carrying out suction filtration, washing and drying, and then preserving heat to obtain a preparation; heating and reducing the preparation in a nitrogen environment to obtain the modified sepiolite; the weight ratio of the titanium tetrachloride to the sepiolite to the carbon black is (0.8-0.95): 1: (1.05-1.2).
By adopting the technical scheme, the preparation method prepares titanium carbonitride through the reaction of carbon black and titanium tetrachloride, sepiolite is added in the process of preparing the titanium carbonitride, the adsorption capacity of the sepiolite is strong, the carbon black and the titanium tetrachloride form uniformly mixed aggregates in the process of reaction and are closely adhered to the surface of the sepiolite, and along with the progress of the reaction, oxygen elements in components are gradually replaced by carbon and nitrogen elements to form TiC x N y The solid solution of the coarse aggregate is wrapped on the sepiolite, and the modified sepiolite is added into the concrete component to tighten the pores between the coarse aggregate and the fine aggregate, so that the compressive strength of the concrete is improved, and the crack generation of the concrete is reduced; when titanium tetrachloride, sepiolite and carbon black are in a specific weight ratio, titanium carbonitride formed after the reaction of the titanium tetrachloride and the carbon black can be stably attached to the surface of the sepiolite, so that the modified sepiolite fills the internal expansion gap of the concrete, and the crack of the concrete is reduced.
Preferably, the nickel powder is pretreated nickel slag powder, and the pretreatment method of the nickel slag powder comprises the following steps: mixing and stirring 5-10 parts by weight of sodium hydroxide and 5-10 parts by weight of hydrazine hydrate to obtain a mixed solution; dissolving 10-20 parts by weight of nickel slag powder and 5-10 parts by weight of nickel sulfate hexahydrate in 20-40 parts by weight of water, mixing and stirring to obtain a nickel slag solution; respectively carrying out ultrasonic vibration on the nickel slag solution and the mixed solution, heating in a water bath while stirring, dripping the nickel slag solution into the mixed solution, centrifuging, washing, drying and obtaining the pretreated nickel slag powder.
Through adopting above-mentioned technical scheme, this application is through carrying out preliminary treatment to nickel slag powder, and hydrazine hydrate is the reductant, and the preliminary treatment nickel powder dispersibility of preparation is better, and easy separation, preliminary treatment nickel powder can evenly disperse in the hole of concrete mixture, makes the hole of concrete mixture reduce, cuts off capillary pore seam, effectively suppresses inside moisture from bottom to top's motion, and then improves the compactibility of concrete, improves the compressive strength of concrete.
Preferably, the weight ratio of the nickel slag powder to the nickel sulfate hexahydrate is 1: (0.4-0.6).
By adopting the technical scheme, when nickel slag powder and nickel sulfate hexahydrate are in a specific weight ratio, the prepared pretreated nickel powder is used for sealing capillary holes in concrete, then wrapping water, and meanwhile, promoting the dispersion of cement particles and reducing bleeding of the concrete.
Preferably, the particle size range of the pretreated nickel slag powder is 300-400nm.
By adopting the technical scheme, the pore in the concrete can be better plugged by controlling the particle size range of the pretreated nickel slag powder, so that the conditions of aggregate drop and water floating in the concrete system are reduced.
Preferably, the weight ratio of the modified sepiolite, the nickel slag powder and the triethanolamine is (1.6-1.8): 1: (0.5-0.6).
By adopting the technical scheme, when the three raw materials are in a specific weight ratio, the triethanolamine can control the fluidity in a concrete mixture system, and the modified sepiolite tightens the pores between the coarse aggregate and the fine aggregate, so that the compressive strength of the concrete is improved, and the crack generation of the concrete is reduced; the three components are matched together, so that the uniformity and the fluidity of each component in the concrete can be ensured, the compressive strength of the concrete can be improved, and the bleeding condition of the concrete can be reduced.
Preferably, the dispersing agent comprises one of cetyltrimethylammonium bromide and sodium dodecyl sulfate.
By adopting the technical scheme, the sepiolite modification effect can be better by selecting a proper dispersing agent, the compressive strength of the concrete is improved, and the crack generation of the concrete is reduced.
Preferably, the cement is Portland cement.
Preferably, the water reducing agent comprises one of calcium lignosulfonate, sodium lignosulfonate and magnesium lignosulfonate.
By adopting the technical scheme, concrete with higher performance can be prepared by selecting proper cement and water reducer.
In a second aspect, the present application provides a method for preparing high-performance concrete, which adopts the following technical scheme:
the preparation method of the high-performance concrete comprises the following steps:
mixing and stirring cement, fly ash, modified sepiolite, nickel slag powder and triethanolamine, adding coarse aggregate, fine aggregate and water, stirring uniformly, adding a water reducer, and stirring uniformly to obtain the high-performance concrete.
By adopting the technical scheme, various raw materials of the concrete, the modified sepiolite, the nickel slag powder and the triethanolamine are mixed together, so that the concrete with higher performance can be obtained.
In summary, the present application has the following beneficial effects:
1. the raw materials of the concrete are adopted, the cement, the coarse aggregate, the fine aggregate, the water and the fly ash are matched with each other to prepare the high-strength concrete, and the water reducer is matched with the high-strength concrete to reduce the consumption of mixing water and increase the workability of the concrete; the sepiolite has a continuous silicon oxygen tetrahedron layer and has good adsorption capacity, the sepiolite is modified, carbon black and titanium tetrachloride are attached to the surface of the sepiolite after being reacted, and the modified sepiolite tightly connects coarse aggregate and fine aggregate, so that the compressive strength of concrete is improved; the nickel slag powder can better fill the pores among various components of the concrete; the triethanolamine can control the concrete to have certain fluidity and promote the preparation of high-performance concrete.
2. According to the preparation method, the nickel slag powder is pretreated, the hydrazine hydrate is used as a reducing agent, the prepared pretreated nickel powder is good in dispersibility and easy to separate, the pretreated nickel powder can be uniformly dispersed in the pores of the concrete mixture, so that the pores of the concrete mixture are reduced, capillary pores are cut off, movement of internal moisture from bottom to top is effectively inhibited, the compactness of the concrete is improved, and the compressive strength of the concrete is improved.
3. When the three raw materials of the modified sepiolite, the nickel slag powder and the triethanolamine are in a specific weight ratio, the triethanolamine can control the fluidity in a concrete mixture system, and the modified sepiolite tightens the pores between the coarse aggregate and the fine aggregate, so that the compressive strength of the concrete is improved, and the crack generation of the concrete is reduced; the three components are matched together, so that the uniformity and the fluidity of each component in the concrete can be ensured, the compressive strength of the concrete can be improved, and the bleeding condition of the concrete can be reduced.
Detailed Description
The present application is described in further detail below in connection with examples and comparative examples.
Examples
Example 1
A preparation method of high-performance concrete comprises the following steps:
25kg of Portland cement, 15kg of fly ash, 3kg of modified sepiolite, 2kg of nickel slag powder and 1kg of triethanolamine are put into a reaction kettle, mixed and stirred for 30s at the temperature of 80 ℃ and the rotating speed of 300 r/min; and adding 105kg of coarse aggregate, 65kg of fine aggregate and 7kg of water, continuously stirring for 2min, uniformly stirring, adding 0.4kg of calcium lignosulfonate water reducer, and stirring for 30s to obtain the high-performance concrete.
The preparation method of the modified sepiolite comprises the following steps:
uniformly mixing 10kg of titanium tetrachloride and 5kg of ethanol at the temperature of 50 ℃ to obtain a mixed solution;
adding 10kg of sepiolite, 5kg of hexadecyl trimethyl ammonium bromide and 10kg of carbon black into 5kg of ethanol, and uniformly stirring at 50 ℃ to obtain suspension;
adding the mixed solution into the suspension, fully and uniformly stirring at 50 ℃, dropwise adding 1kg of ammonia water to ensure that the pH value of the solution is 7, filtering, washing and drying, then preserving heat for 2 hours at 350 ℃ to obtain the prepared powder, putting the prepared powder into a vacuum furnace, introducing nitrogen into the vacuum furnace, controlling the pressure at 1500Pa, and reducing for 2 hours at 1200 ℃ to obtain the modified sepiolite.
Examples 2 to 3
The preparation methods of the high performance concrete of example 2 and example 3 are basically the same as those of example 1, except that the raw materials for preparing the high performance concrete are added in weight as shown in table 1:
TABLE 1
Example 4
The preparation method of the high-performance concrete is different from that of the embodiment 3 in that the preparation method of the modified sepiolite comprises the following steps: uniformly mixing 20kg of titanium tetrachloride and 10kg of ethanol at 50 ℃ to obtain a mixed solution;
adding 20kg of sepiolite, 10kg of hexadecyl trimethyl ammonium bromide and 20kg of carbon black into 10kg of ethanol, and uniformly stirring at 50 ℃ to obtain suspension;
adding the mixed solution into the suspension, fully and uniformly stirring at 50 ℃, dropwise adding 3kg of ammonia water to ensure that the pH value of the solution is 7, filtering, washing and drying, and then preserving the heat for 2 hours at 350 ℃ to obtain the modified sepiolite.
Example 5
A method for producing a high-performance concrete was different from example 3 in that the amount of titanium tetrachloride charged was 12kg, the amount of sepiolite charged was 15kg, and the amount of carbon black charged was 16kg.
Example 6
A method for producing a high-performance concrete was different from example 3 in that the amount of titanium tetrachloride charged was 14kg, the amount of sepiolite charged was 15kg, and the amount of carbon black charged was 18kg.
Example 7
A method for preparing high-performance concrete, which is different from example 6 in that the nickel slag powder is pretreated before being put into the nickel slag powder, wherein the pretreatment method of the nickel slag powder is as follows: mixing and stirring 5kg of sodium hydroxide and 5kg of hydrazine hydrate at the temperature of 40 ℃ to obtain a mixed solution, mixing and stirring 10kg of nickel slag powder and 5kg of nickel sulfate hexahydrate in 20kg of water at the temperature of 40 ℃ to obtain a nickel slag solution; respectively carrying out ultrasonic vibration on the nickel slag solution and the mixed solution in an ultrasonic cleaner until the nickel slag solution and the mixed solution are uniformly dispersed, then putting the nickel slag solution and the mixed solution into a water bath pot, heating the nickel slag solution to 80 ℃ in a water bath, stirring the nickel slag solution for 30min at the speed of 250r/min, dripping the nickel slag solution into the mixed solution at the speed of 3mL/min, centrifuging the nickel slag solution at the speed of 8000r/min in a centrifuge, washing the nickel slag solution with ethanol, and then drying the nickel slag powder at the temperature of 60 ℃ after the nickel slag powder is cleaned, thereby obtaining the pretreated nickel slag powder.
Example 8
A method for preparing high-performance concrete, which is different from example 6 in that the nickel slag powder is pretreated before being put into the nickel slag powder, wherein the pretreatment method of the nickel slag powder is as follows: mixing and stirring 10kg of sodium hydroxide and 10kg of hydrazine hydrate at the temperature of 40 ℃ to obtain a mixed solution, mixing and stirring 20kg of nickel slag powder and 10kg of nickel sulfate hexahydrate in 40kg of water at the temperature of 40 ℃ to obtain a nickel slag solution; respectively carrying out ultrasonic vibration on the nickel slag solution and the mixed solution in an ultrasonic cleaner until the nickel slag solution and the mixed solution are uniformly dispersed, then putting the nickel slag solution and the mixed solution into a water bath pot, heating the nickel slag solution to 80 ℃ in a water bath, stirring the nickel slag solution for 30min at the speed of 250r/min, dripping the nickel slag solution into the mixed solution at the speed of 3mL/min, centrifuging the nickel slag solution at the speed of 8000r/min in a centrifuge, washing the nickel slag solution with ethanol, and then drying the nickel slag powder at the temperature of 60 ℃ after the nickel slag powder is cleaned, thereby obtaining the pretreated nickel slag powder.
Example 9
A method for preparing high-performance concrete is different from example 8 in that the input amount of nickel slag powder is 15kg and the input amount of nickel sulfate hexahydrate is 6kg.
Example 10
A method for preparing high-performance concrete is different from example 8 in that the input amount of nickel slag powder is 15kg and the input amount of nickel sulfate hexahydrate is 8kg.
Example 11
A preparation method of high-performance concrete is different from example 10 in that the input amount of modified sepiolite is 4.8kg, the input amount of nickel slag powder is 3kg, and the input amount of triethanolamine is 1.6kg.
Example 12
A method for preparing high-performance concrete is different from example 10 in that the input amount of modified sepiolite is 5.6kg, the input amount of nickel slag powder is 3kg, and the input amount of triethanolamine is 1.8kg.
Comparative example
Comparative example 1
A method for preparing high-performance concrete is different from example 1 in that the modified sepiolite is replaced by sepiolite in equal amount.
Comparative example 2
A method for preparing high-performance concrete, which is different from example 1 in that nickel slag powder is replaced by iron slag powder in equal amount.
Comparative example 3
A method for preparing high-performance concrete, which is different from example 1 in that nickel slag powder is not added.
Comparative example 4
A method for preparing high-performance concrete is different from example 1 in that modified sepiolite is not added.
Performance test:
compressive strength: standard test blocks are prepared according to GB/T50010 concrete structural design Specification, and the compressive strength of concrete is tested on days 7 and 28.
Bleeding rate: the prepared concrete mixture was put into a 5L container at one time and vibrated on a vibrating table for 20s. The surface was gently screeded with a spatula, the time was calculated from the surface, the bleeding was sucked out with a pipette every 10min for the first 60min, then water was sucked out every 20min until no bleeding was observed three times in succession, then the amount of water sucked out each time and the total amount of water were measured, and the bleeding rate was calculated.
Crack resistance: manufacturing a standard test block according to GB/T50081-2019 'ordinary concrete mechanical property test method Standard', and calculating the number of cracks in a unit area after concrete casting for 24 hours; wherein the number of cracks per unit area is recorded as the number of cracks.
According to the data comparison of the examples 1-4 and the comparative examples 1-4, the raw materials of the concrete, cement, coarse aggregate, fine aggregate, water and fly ash are adopted to be matched with each other to prepare high-strength concrete, and the water reducer is matched to reduce the consumption of mixing water and increase the workability of the concrete; the sepiolite has a continuous silicon oxygen tetrahedron layer and has good adsorption capacity, the sepiolite is modified, carbon black and titanium tetrachloride are attached to the surface of the sepiolite after being reacted, and the modified sepiolite tightly connects coarse aggregate and fine aggregate, so that the compressive strength of concrete is improved; the nickel slag powder can better fill the pores among various components of the concrete; the triethanolamine can control the concrete to have certain fluidity and promote the preparation of high-performance concrete.
According to the data comparison of the example 3 and the examples 5-6, when titanium tetrachloride, sepiolite and carbon black are in a specific weight ratio, titanium carbonitride formed after the reaction of titanium tetrachloride and carbon black can be stably adhered to the sepiolite surface, so that the modified sepiolite fills the internal expansion gaps of the concrete, and the cracks of the concrete are reduced.
According to the data comparison of the embodiments 6-8, the nickel slag powder is pretreated, hydrazine hydrate is used as a reducing agent, the prepared pretreated nickel powder is good in dispersibility and easy to separate, and the pretreated nickel powder can be uniformly dispersed in the pores of the concrete mixture, so that the pores of the concrete mixture are reduced, capillary pores are cut off, the movement of internal moisture from bottom to top is effectively inhibited, the compactness of the concrete is further improved, and the compressive strength of the concrete is improved.
According to the data comparison of examples 8-10, when nickel slag powder and nickel sulfate hexahydrate are in a specific weight ratio, the prepared pretreated nickel powder is used for sealing capillary holes in concrete, then the water is wrapped, meanwhile, the cement particles are promoted to be dispersed, and the bleeding situation of the concrete is reduced.
According to the data comparison of the examples 10-12, when the three raw materials of the modified sepiolite, the nickel slag powder and the triethanolamine are in a specific weight ratio, the triethanolamine can control the fluidity in a concrete mixture system, and the modified sepiolite tightens the pores between the coarse aggregate and the fine aggregate, so that the compressive strength of the concrete is improved, and the crack generation of the concrete is reduced; the three components are matched together, so that the uniformity and the fluidity of each component in the concrete can be ensured, the compressive strength of the concrete can be improved, and the bleeding condition of the concrete can be reduced.
The specific embodiments are illustrative only and not intended to be limiting, as modifications would be required to the embodiments after reading the present specification without inventive contribution, but would be protected by the patent laws within the scope of the claims of the present application.
Claims (10)
1. A high performance concrete characterized by: the composite material is prepared from the following raw materials in parts by weight:
and (3) cement: 250-300 parts;
coarse aggregate: 1050-1150 parts;
fine aggregate: 650-700 parts;
fly ash: 150-200 parts;
water: 70-120 parts;
water reducing agent: 4-8 parts of a lubricant;
modified sepiolite: 30-60 parts;
nickel slag powder: 20-40 parts of a lubricant;
triethanolamine: 10-20 parts of a lubricant;
the modified sepiolite comprises sepiolite, carbon black, titanium tetrachloride, ethanol, a dispersing agent and ammonia water.
2. A high performance concrete according to claim 1, wherein: the preparation method of the modified sepiolite comprises the following steps: mixing and stirring 10-20 parts by weight of titanium tetrachloride and 5-10 parts by weight of ethanol to obtain a mixed solution; mixing and stirring 10-20 parts by weight of sepiolite, 5-10 parts by weight of dispersing agent, 10-20 parts by weight of carbon black and 5-10 parts by weight of ethanol to obtain suspension; adding the mixed solution into the suspension, fully mixing, then dripping 1-3 parts by weight of ammonia water, adjusting the pH to 7-8, carrying out suction filtration, washing and drying, and then preserving heat to obtain a preparation; heating and reducing the preparation in a nitrogen environment to obtain the modified sepiolite; the weight ratio of the titanium tetrachloride to the sepiolite to the carbon black is (0.8-0.95): 1: (1.05-1.2).
3. A high performance concrete according to claim 1, wherein: the nickel powder is pretreated nickel slag powder, and the pretreatment method of the nickel slag powder comprises the following steps: mixing and stirring 5-10 parts by weight of sodium hydroxide and 5-10 parts by weight of hydrazine hydrate to obtain a mixed solution; dissolving 10-20 parts by weight of nickel slag powder and 5-10 parts by weight of nickel sulfate hexahydrate in 20-40 parts by weight of water, mixing and stirring to obtain a nickel slag solution; respectively carrying out ultrasonic vibration on the nickel slag solution and the mixed solution, heating in a water bath while stirring, dripping the nickel slag solution into the mixed solution, centrifuging, washing, drying and obtaining the pretreated nickel slag powder.
4. A high performance concrete according to claim 1, wherein: the weight ratio of the nickel slag powder to the nickel sulfate hexahydrate is 1: (0.4-0.6).
5. A high performance concrete according to claim 1, wherein: the particle size range of the pretreated nickel slag powder is 300-400nm.
6. A high performance concrete according to claim 1, wherein: the weight ratio of the modified sepiolite, the nickel slag powder and the triethanolamine is (1.6-1.8): 1: (0.5-0.6).
7. A high performance concrete according to claim 1, wherein: the dispersing agent comprises one of cetyltrimethylammonium bromide and sodium dodecyl sulfate.
8. A high performance concrete according to claim 1, wherein: the cement is Portland cement.
9. A high performance concrete according to claim 1, wherein: the water reducer comprises one of calcium lignosulfonate, sodium lignosulfonate and magnesium lignosulfonate.
10. A method for preparing high-performance concrete, for preparing high-performance concrete according to any one of claims 1 to 9, characterized by comprising the steps of:
mixing and stirring cement, fly ash, modified sepiolite, nickel slag powder and triethanolamine, adding coarse aggregate, fine aggregate and water, stirring uniformly, adding a water reducer, and stirring uniformly to obtain the high-performance concrete.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105130492A (en) * | 2015-08-18 | 2015-12-09 | 武汉天沭除尘设备有限公司 | Nickel slag aerated concrete and preparation method thereof |
| CN112010603A (en) * | 2020-08-18 | 2020-12-01 | 湖州上建混凝土有限公司 | High-water-permeability concrete and preparation method thereof |
| CN112047683A (en) * | 2020-08-24 | 2020-12-08 | 北京天地建设砼制品有限公司 | High-strength self-compacting concrete and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105130492A (en) * | 2015-08-18 | 2015-12-09 | 武汉天沭除尘设备有限公司 | Nickel slag aerated concrete and preparation method thereof |
| CN112010603A (en) * | 2020-08-18 | 2020-12-01 | 湖州上建混凝土有限公司 | High-water-permeability concrete and preparation method thereof |
| CN112047683A (en) * | 2020-08-24 | 2020-12-08 | 北京天地建设砼制品有限公司 | High-strength self-compacting concrete and preparation method thereof |
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