CN116283044A - High-strength concrete internal curing agent and preparation method and application thereof - Google Patents
High-strength concrete internal curing agent and preparation method and application thereof Download PDFInfo
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- 239000011372 high-strength concrete Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 37
- 238000001723 curing Methods 0.000 claims abstract description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- 238000003756 stirring Methods 0.000 claims abstract description 62
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 59
- 239000000843 powder Substances 0.000 claims abstract description 34
- 229920000642 polymer Polymers 0.000 claims abstract description 32
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000005406 washing Methods 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 13
- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052627 muscovite Inorganic materials 0.000 claims abstract description 13
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 13
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229940072056 alginate Drugs 0.000 claims abstract description 12
- 235000010443 alginic acid Nutrition 0.000 claims abstract description 12
- 229920000615 alginic acid Polymers 0.000 claims abstract description 12
- PKTOVQRKCNPVKY-UHFFFAOYSA-N dimethoxy(methyl)silicon Chemical compound CO[Si](C)OC PKTOVQRKCNPVKY-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 11
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 7
- 238000009832 plasma treatment Methods 0.000 claims abstract description 7
- 239000013081 microcrystal Substances 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 18
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 18
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 18
- 239000002131 composite material Substances 0.000 claims description 17
- 239000002736 nonionic surfactant Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 14
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 12
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 150000002191 fatty alcohols Chemical class 0.000 claims description 8
- 238000006386 neutralization reaction Methods 0.000 claims description 7
- XFRVVPUIAFSTFO-UHFFFAOYSA-N 1-Tridecanol Chemical compound CCCCCCCCCCCCCO XFRVVPUIAFSTFO-UHFFFAOYSA-N 0.000 claims description 6
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 71
- 239000003638 chemical reducing agent Substances 0.000 description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 12
- 239000004568 cement Substances 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 11
- 238000007789 sealing Methods 0.000 description 11
- 239000000243 solution Substances 0.000 description 10
- 238000003763 carbonization Methods 0.000 description 9
- 239000012153 distilled water Substances 0.000 description 9
- 230000004907 flux Effects 0.000 description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 description 9
- 239000011707 mineral Substances 0.000 description 9
- 239000010881 fly ash Substances 0.000 description 8
- 238000011056 performance test Methods 0.000 description 8
- 239000004575 stone Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 238000002791 soaking Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 239000008399 tap water Substances 0.000 description 7
- 235000020679 tap water Nutrition 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000001603 reducing effect Effects 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 4
- 235000015097 nutrients Nutrition 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- XUJLWPFSUCHPQL-UHFFFAOYSA-N 11-methyldodecan-1-ol Chemical compound CC(C)CCCCCCCCCCO XUJLWPFSUCHPQL-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 241001474374 Blennius Species 0.000 description 1
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- 235000008585 Pinus thunbergii Nutrition 0.000 description 1
- 241000218686 Pinus thunbergii Species 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/52—Polymerisation initiated by wave energy or particle radiation by electric discharge, e.g. voltolisation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/06—Preparatory processes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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 a preparation method of a high-strength concrete internal curing agent, which comprises the following steps: 1) Sodium silicate solution and methyldimethoxy silane are used as raw materials to prepare a polymer A through reaction; 2) The preparation method comprises the steps of carrying out glow discharge electrolysis plasma treatment on micro-crystal muscovite ultrafine powder, alginate fiber powder, N-methylene bisacrylamide and acrylic acid serving as main raw materials to prepare a polymer B; 3) And mixing and stirring the polymer A and the polymer B, neutralizing, washing and drying to obtain the internal curing agent. The high-strength concrete internal curing agent has excellent water retention and water release properties, and can synchronously improve the volume stability, mechanical property and durability of the concrete; the related preparation method is simple, mild in reaction condition, short in preparation period and suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of concrete additives, and particularly relates to a high-strength concrete internal curing agent, a preparation method and application thereof.
Background
The increase of the strength of the concrete can effectively reduce the dead weight of the building, and the progress of the concrete technology ensures that the high-strength high-performance concrete is increasingly widely applied to various building structures, especially the construction of high-rise buildings and large-span bridges since the last 80 th century. In high-strength high-performance concrete, the water-cement ratio is usually low, and the cement material consumption is large, so that the internal pore size of the concrete is small, the alkalinity of the pore solution is high, and the concrete can show better mechanical property and durability; however, the lower water-gel ratio can simultaneously cause the problems of reduced relative humidity in the mixed soil, increased self-shrinkage of the material and the like, and in addition, the insufficient water in the concrete can also cause the problems of limited later strength development, early cracking, influence on mechanical properties, durability and the like of the high-strength concrete.
At present, the internal curing technology of concrete is a curing method capable of effectively avoiding shrinkage cracking phenomenon of concrete in the curing process, and the internal curing materials with wide application mainly comprise three major categories of porous lightweight aggregate (LWA), super absorbent resin (SAP) and Shrinkage Reducing Agent (SRA), and the defects that the performance of the concrete is affected to a certain extent in the use process are as follows: 1) The LWA is doped to influence the mechanical properties of the concrete to a certain extent, and further research is still needed on how to keep other properties of the concrete good on the premise of maintaining the internal curing effect; 2) Aiming at the internal curing system based on the SAP, different preparation processes and raw materials can influence the physical properties of the SAP such as water absorption rate, particle size, water release rate and the like, and the way in which the SAP is doped into the concrete can influence the performance change of the concrete; in addition, for SAP applied to practical engineering, how to control the property of SAP not to change during transportation and pouring is a problem; 3) For the internal curing system based on SRA, the shrinkage reducing agent can reduce self-shrinkage cracking of the concrete, but the mechanical properties or other service properties of the concrete are generally affected due to the problems of compatibility and the like between the shrinkage reducing agent and other additives, such as: reducing the plasticizing effect of the high-efficiency water reducer, reducing the shrinkage reducing effect of the shrinkage reducing agent, greatly reducing the mechanical property of the cement-based material (the strength of the concrete is reduced by more than 10-15 percent), and the like.
Therefore, the novel simple and efficient high-strength concrete internal curing agent is further explored, the preparation process of the novel simple and efficient high-strength concrete internal curing agent is optimized, and the novel simple and efficient high-strength concrete internal curing agent has important research and application significance.
Disclosure of Invention
Aiming at the problems and the defects existing in the prior art, the invention provides a novel internal curing material which has excellent water retention and water release properties, can synchronously improve the volume stability, the mechanical property and the durability of concrete, and has wide applicability; the related preparation method is simple, mild in reaction condition, short in preparation period and suitable for popularization and application.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the preparation method of the high-strength concrete internal curing agent comprises the following steps:
1) Dissolving a composite nonionic surfactant in water, adding a sodium silicate solution and methyldimethoxy silane into the water, and stirring the mixture; then adding ammonia water under stirring, and uniformly mixing to obtain a polymer A; wherein the composite nonionic surfactant consists of fatty alcohol polyoxyethylene ether and isomeric tridecanol polyoxyethylene ether;
2) Uniformly mixing microcrystalline muscovite ultrafine powder, alginate fiber powder, N-methylene bisacrylamide (cross-linking agent) and water, primarily stirring the obtained mixture at normal temperature, then adding acrylic acid, heating and uniformly stirring, performing glow discharge electrolysis plasma treatment, then performing heating and stirring reaction, and cooling to room temperature to obtain a polymer B;
3) And mixing and stirring the polymer A and the polymer B, neutralizing until the neutralization degree is more than 90%, washing and drying to obtain the internal curing agent.
In the above scheme, the microcrystalline muscovite micropowder has particle size D 90 Not more than 3 μm, loose density not more than 0.20g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Sand content less than or equal to 0.2%, siO 2 The content is 45-48%, al 2 O 3 The content is 25-30%.
In the above scheme, the average particle size of the alginate fiber powder is 30-40 μm.
In the scheme, the mass ratio of the fatty alcohol polyoxyethylene ether to the isomeric tridecanol polyoxyethylene ether in the composite nonionic surfactant is 1 (1-1.5).
In the scheme, the raw materials adopted in the step 1) and the parts by weight thereof comprise: 4800-5200 parts of water, 0.5-1 part of compound nonionic surfactant, 20-25 parts of sodium silicate solution, 75-80 parts of methyldimethoxy silane and 0.5-1 part of ammonia water.
In the scheme, the pH value of the sodium silicate solution is 11-13, and the mass concentration is 30-40%.
Further, the mass concentration of the ammonia water is 25-28%.
In the above scheme, the stirring treatment step in step 1) is performed for 40-50 min; the mixing time after adding ammonia water is 10-15 min.
In the scheme, the raw materials adopted in the step 2) and the parts by weight thereof comprise: 45-50 parts of micro-crystal muscovite ultrafine powder, 10-15 parts of alginate fiber powder, 8-10 parts of N, N-methylene bisacrylamide, 8250-9000 parts of water and 900-1100 parts of acrylic acid.
In the above scheme, the preliminary stirring time in the step 2) is 40-50 min.
In the scheme, the heating and stirring step in the step 2) is carried out at 50-55 ℃ for 15-20 min; the temperature adopted in the heating and stirring reaction step is 55-60 ℃ and the time is 15-20 min.
In the above scheme, the glow discharge electrolytic plasma treatment step comprises: two electrodes are inserted, and the discharge reaction is carried out for 2-3 mm under the voltage conditions of 180-220V, 480-520V and 780-820V respectively.
Further, in the glow discharge electrolysis plasma treatment process, the voltage gradient between adjacent voltage gradients is increased by 280-320V.
In the scheme, the mixing and stirring time in the step 3) is 100-120 min.
In the above scheme, the washing step of step 3) includes: washing with water and ethanol in turn; the drying step comprises the following steps: sealing, putting into a baking oven at 50-55 ℃ for 22-24 h, removing the sealing, and putting into a dryer for drying for 4-6 h.
The high-strength concrete internal curing agent prepared according to the scheme has the tap water absorption rate of 380-400 g/g, and the water retention rate can reach more than 90% after soaking for 24 hours; the water retention and water release properties of the concrete are excellent, and the concrete internal curing agent with proper amount is added, so that the concrete volume stability, the mechanical property and the durability of the concrete can be improved, the shrinkage rate of the concrete in 28d age can be reduced by 18-20%, the compression strength of the concrete of a standard curing 28d age cement-fly ash-mineral powder ternary cementing material system can be improved by 8-10% in terms of mechanical property, and the electric flux of the concrete in 56d under standard curing can be reduced by 150-200 ℃ and the carbonization depth can be reduced by 25-30% in terms of durability.
The internal curing agent obtained by the invention is applied to preparing high-strength concrete, and the mixing amount of the internal curing agent in the high-strength concrete is 1.8-2.2% of the mass of the cementing material.
Wherein each component and the volume weight thereof comprise:
formula one, grade C60: 395-405 kg/m of cement 3 45-55 kg/m of fly ash 3 Mineral powder105～115kg/m 3 600-610 kg/m of sand 3 Stone 1060-1080 kg/m 3 140 to 150g/m of water 3 12.5-13.5 kg/m polycarboxylate water reducer 3 10.5-12.5 kg/m of high-strength concrete internal curing agent 3 ；
Formula II, grade C70: cement 495-505 kg/m 3 45-55 kg/m of fly ash 3 45-55 kg/m of mineral powder 3 915-930 kg/m of sand 3 770-780 kg/m stone 3 140 to 150g/m of water 3 14.5-15.5 kg/m polycarboxylate superplasticizer 3 10.5-13.0 kg/m of high-strength concrete internal curing agent 3 。
The principle of the invention is as follows:
according to the invention, sodium silicate and methyldimethoxysilane are used as main raw materials, composite fatty alcohol polyoxyethylene ether and isomeric tridecanol polyoxyethylene ether are used as composite nonionic surfactants, and a siliceous porous water-retaining material (polymer A) is introduced in a reaction manner, so that unreacted water in the concrete is fully present in capillary holes, the generation of capillary pressure is avoided, and therefore shrinkage and cracking of the concrete are reduced, and meanwhile, the quantity of hydration products in the concrete is increased, the porosity of the concrete is reduced, and the pore structure is thinned; on the other hand, the muscovite ultrafine powder and the alginate fiber powder are introduced, so that the micro-pore structure of the concrete material can be filled from the aspect of physical performance while the water absorption and water retention functions of the internal maintenance material are ensured, and the volume stability, the mechanical property and the durability of the concrete material are improved by combining the fiber toughening effect of the alginate fiber powder; in addition, the high water absorption composite material (polymer B) is prepared by adopting a glow electrolysis method, and the problems of unstable polymerization process (polymerization reaction and the like) and the like are effectively improved by combining with gradient discharge conditions, so that the reaction efficiency is synchronously improved; finally, the two types of polymers are compositely used, so that the problems that the traditional internal curing material is easy to cause adverse effect on the performance of concrete and the like are solved, the water absorption and water retention performances of the single type of polymer are further enhanced, the advantages are complementary, the adaptability is excellent, and the self performance of the internal curing material and the comprehensive application effect of the internal curing material in the concrete can be comprehensively improved from two physical and chemical layers.
Compared with the prior art, the invention has the beneficial effects that:
1) The high-strength concrete internal curing agent has good water retention and water release properties and good dispersibility, and can provide uniform curing for the internal structure of the concrete; the volume stability of the obtained concrete can be effectively improved, the shrinkage rate is reduced, and the compression resistance and the flexural strength of the concrete are synchronously improved; the mechanical property and the durability of the concrete are integrally improved;
2) The whole preparation process has mild condition, controllable reaction and no secondary pollution, can obviously improve the comprehensive improvement effect of the obtained internal curing agent, and has important research and application significance.
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.
In the following examples, the cement used was green pine P.O 42.5.5R cement; the fly ash is F.III fly ash of a red second power plant, and the fineness is 35%; the mineral powder is Baoxinshengyuan S75 mineral powder with specific surface area of 395m 2 /kg; the sand is concrete source sand, the fineness modulus is 3.4, the water content is 2.5%, and the mud content is 1.1%; the stone is concrete source stone with the grain diameter of 5-20 mm, the mud content of 0.4%, the crushing index of 3% and the apparent density of 2670kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The water reducer is a polycarboxylic acid high-performance water reducer of chemical building material limited company, and has a solid content of 12.15% and a water reducing rate of 27%;
in the following examples, the prepared internal curing agent was white powder with an average particle size of 20 to 30. Mu.m, and the amount of the internal curing agent added to the concrete was 2% by mass of the cement.
In the following embodiments, the glow discharge electrolysis plasma treatment adopts a direct current stabilized power supply device, and the device can perform variable-voltage regulation and control to realize variable-voltage regulation within the range of 0-1500V.
Example 1
The preparation method of the high-strength concrete internal curing agent comprises the following steps:
1) 5000 parts (weight parts, the same applies below) of water is added into a beaker, 0.5 part of compound nonionic surfactant is weighed according to the compound proportion of fatty alcohol polyoxyethylene ether and isomeric tridecanol polyoxyethylene ether with the mass ratio of 1:1, and the mixture is added into the water, and is placed into a water bath with 50 ℃ for stirring and dissolution; then adding 20 parts of sodium silicate solution (the mass concentration is 35%) and 80 parts of methyldimethoxy silane, fully stirring for 40min, then slowly adding 0.5 part of ammonia water (the mass concentration is 25%), rapidly stirring (the stirring rate is 300 r/min) for 10-15 min while adding, and then sealing and marking as a polymer A;
2) Simultaneously with the step 1), adding microcrystalline muscovite ultrafine powder (particle size D) into a three-neck flask 90 Bulk density=0.20 g/cm =3 μm 3 ) 45 parts of alginate fiber powder (fiber strength: 1.8d, average particle diameter is 30 mu m) 15 parts, 9 parts of N, N-methylene bisacrylamide (chemical purity) and 8500 parts of water, primarily stirring the mixture at normal temperature for 40min, then adding 1000 parts of acrylic acid (analytical purity) and raising the temperature to 50 ℃, continuously stirring for 15min, inserting two electrodes to respectively perform gradient discharge for 2min at 200V, 500V and 800V, then raising the temperature to 60 ℃, continuously stirring and reacting for 15min, and cooling to room temperature to obtain polymer B;
3) And mixing and stirring the obtained polymer A and the polymer B for 100min, neutralizing with NaOH (30%) until the neutralization degree is 90%, washing with water for several times, washing with ethanol, sealing, placing into a 50 ℃ oven for 24h, removing the seal, and placing into a dryer for drying for 5h to obtain the high-strength concrete internal curing agent.
Through tests, the internal nutrient obtained in the embodiment has the tap water absorption rate of 390g/g and the water retention rate after soaking for 24 hours of 92.2 percent.
Application example 1
The high-strength concrete internal curing agent obtained in the example 1 is applied to the preparation of high-strength concrete (C60 grade), and the concrete steps comprise:
the obtained internal curing agent is fully stirred in water, and coarse and fine aggregates and cementing materials (the total design dosage is 560kg/m 3 ) Dry stirring in a stirrer for 40 seconds, and finally pouring the internal curing mixed solution into the stirrer for fully stirring for 3 minutes, and controlling the slump of the concrete to be (200+/-20) mm by adjusting the dosage of the water reducer; tool withThe volume mixing ratio is shown in Table 1, and the performance test results of the obtained concrete are shown in Table 2.
TABLE 1 concrete mix (kg/m) 3 )
| Group of | Cement and its preparation method | Fly ash | Mineral powder | Sand and sand | Stone | Water and its preparation method | Water reducing agent | Internal curing agent |
| Datum | 400 | 50 | 110 | 605 | 1070 | 144 | 13.2 | |
| Application example 1 | 400 | 50 | 110 | 605 | 1070 | 144 | 13.2 | 11.0 |
TABLE 2 Performance test results of high-strength concrete obtained in application example 1
| Group of | Shrinkage expansion ratio (%) | Compressive strength (MPa) | Electric flux (C) | Depth of carbonization (mm) |
| Age of age | 28d | 28d | 56d | 56d |
| Datum | -0.055 | 73.8 | 720 | 3.26 |
| Application example 1 | -0.045 | 79.7 | 540 | 2.45 |
The results show that compared with the standard group without the internal curing agent, the high-strength concrete obtained by the application example can synchronously improve the volume stability, the mechanical property and the durability, and is concretely as follows: in terms of volume stability, the shrinkage rate of the concrete in the 28d age is reduced by 18%; in terms of mechanical properties, the compressive strength of the concrete in 28d age of standard curing is improved by 8%; in terms of durability, the 56d electric flux of the concrete under standard curing is reduced by 180 ℃ and the carbonization depth is reduced by 25%.
Example 2
The preparation method of the high-strength concrete internal curing agent comprises the following steps:
1) Adding 5000 parts of distilled water into a beaker, weighing 0.5 part of composite nonionic surfactant according to the composite proportion of fatty alcohol polyoxyethylene ether and isotridecyl alcohol polyoxyethylene ether of which the mass ratio is 1:1.5, adding the mixture into the water, and placing the mixture into a water bath at 50 ℃ for stirring and dissolving; then 25 parts of sodium silicate solution (the mass concentration is 35%) and 75 parts of methyldimethoxy silane are added, fully stirred for 40min, then 0.5 part of ammonia water (the mass concentration is 25%) is slowly added, and the mixture is rapidly stirred (the stirring rate is 300r/min and is 10-15 min, and then sealed and marked as a polymer A;
2) Simultaneously with the step 1), adding microcrystalline muscovite ultrafine powder (particle size D) into a three-neck flask 90 Bulk density=0.20 g/cm =2.5 μm 3 ) 50 parts of seaweed fiber powder (fiber strength: 1.8d, average particle diameter 40 μm) 10 parts, 9 parts of N, N-methylenebisacrylamide (chemical purity) and 8800 parts of distilled water, initially stirring the mixture at normal temperature for 40min, then adding 1000 parts of acrylic acid (analytical purity) and raising the temperature to 50 ℃, continuously stirring uniformly for 15min, and inserting two electrodes at 200V, 500V and 800VRespectively carrying out gradient discharge for 3min, then raising the temperature to 60 ℃, continuously stirring and reacting for 15min, cooling to room temperature, and marking as a polymer B;
3) And mixing and stirring the polymer A and the polymer B for 100min, neutralizing with NaOH (30%) until the neutralization degree is 95%, washing with distilled water for several times, washing with ethanol, sealing, placing into a 50 ℃ oven for 24h, removing the seal, and placing into a dryer for drying for 5h to obtain the high-strength concrete internal curing agent.
Through tests, the internal nutrient obtained in the embodiment has the tap water absorption rate of 395g/g and the water retention rate of 93.6% after soaking for 24 hours.
Application example 2
The high-strength concrete internal curing agent obtained in the example 2 is applied to the preparation of high-strength concrete (C70 grade), and the concrete steps comprise:
the internal curing agent obtained in example 2 was first thoroughly stirred in water, and then coarse aggregate, fine aggregate and binder (total design amount: 600kg/m 3 ) Dry stirring in a stirrer for 40 seconds, and finally pouring the internal curing mixed solution into the stirrer for fully stirring for 3 minutes, and controlling the slump of the concrete to be (200+/-20) mm by adjusting the dosage of the water reducer; the concrete performance test results are shown in Table 4.
TABLE 3 concrete mix (kg/m) 3 )
| Group of | Cement and its preparation method | Fly ash | Mineral powder | Sand and sand | Stone | Water and its preparation method | Water reducing agent | Internal curing agent |
| Datum | 500 | 50 | 50 | 922 | 775 | 145 | 14.7 | |
| Application example 2 | 500 | 50 | 50 | 922 | 775 | 145 | 14.7 | 11.3 |
TABLE 4 Performance test results of high-strength concrete obtained in application example 2
| Group of | Shrinkage expansion ratio (%) | Compressive strength (MPa) | Electric flux (C) | Depth of carbonization (mm) |
| Age of age | 28d | 28d | 56d | 56d |
| Datum | -0.058 | 86.8 | 670 | 3.02 |
| Application example 2 | -0.046 | 95.5 | 480 | 2.17 |
The results show that compared with the standard group without the internal curing agent, the high-strength concrete obtained by the application example can synchronously improve the volume stability, the mechanical property and the durability, and is concretely as follows: in terms of volume stability, the shrinkage rate of the concrete in the 28d age is reduced by 20%, in terms of mechanical property, the compressive strength of the concrete in the 28d age of standard curing is improved by 10%, in terms of durability, the electric flux of 56d is reduced by 190 ℃ and the carbonization depth is reduced by 28% in the concrete in the standard curing.
Comparative example 1
The preparation method of the high-strength concrete internal curing agent comprises the following steps:
1) Adding 5000 parts of water into a beaker, weighing 0.5 part of composite nonionic surfactant according to the composite proportion of fatty alcohol polyoxyethylene ether and isotridecyl alcohol polyoxyethylene ether with the mass ratio of 1:1, adding the mixture into the water, and placing the mixture into a water bath at 50 ℃ for stirring and dissolving; then adding 20 parts of sodium silicate solution (the mass concentration is 35%) and 80 parts of methyldimethoxy silane, fully stirring for 40min, then slowly adding 0.5 part of ammonia water (the mass concentration is 25%), rapidly stirring (the stirring rate is 300 r/min) for 10-15 min while adding, and then sealing;
2) And (3) placing the mixture in a 50 ℃ oven for 24 hours, removing the seal, and placing the mixture in a dryer for drying for 5 hours to prepare the internal curing agent.
Through testing, the tap water absorption rate of the obtained internal curing agent is 220g/g, and the water retention rate after soaking for 24 hours is 79.5%; the water retention and water release properties of the water-retaining and water-releasing agent are obviously reduced.
Comparative example 2
The preparation method of the high-strength concrete internal curing agent comprises the following steps:
1) The three-necked flask was charged with fine powder of microcrystalline muscovite (particle size D 90 Bulk density=0.20 g/cm =2.5 μm 3 ) 60 parts of N, N-methylene bisacrylamide (chemical purity) 9 parts and distilled water 8800 parts, primarily stirring the mixture at normal temperature for 40min, then adding 1000 parts of acrylic acid (analytically pure) and raising the temperature to 50 ℃, continuously stirring uniformly for 15min, inserting two electrodes to respectively perform gradient discharge for 3min at 200V, 500V and 800V, then raising the temperature to 80 ℃, continuously and fully stirring for reacting for 15min, and cooling to the room temperature;
2) And (3) neutralizing with NaOH (30%) until the neutralization degree is 95%, washing with distilled water for several times, washing with ethanol, sealing, placing into a 50 ℃ oven for 24 hours, removing the seal, and placing into a dryer for drying for 5 hours to obtain the high-strength concrete internal curing agent.
Through tests, the obtained internal nutrient has the tap water absorption rate of 200g/g and the water retention rate of 76.4% after soaking for 24 hours.
The obtained concrete internal curing agent is applied to the preparation of high-strength concrete (C60 grade), and the concrete internal curing agent comprises the following specific steps of
The internal curing agent is fully stirred in water, and coarse aggregate, fine aggregate and cementing material (the total design dosage is 560kg/m 3 ) Dry stirring in a stirrer for 40 seconds, and finally pouring the internal curing mixed solution into the stirrer for fully stirring for 3 minutes, and controlling the slump of the concrete to be (200+/-20) mm by adjusting the dosage of the water reducer; the specific compounding ratios are shown in Table 5 below; the results of the performance test of the obtained concrete are shown in Table 6.
TABLE 5 concrete mix (kg/m) 3 )
| Group of | Cement and its preparation method | Fly ash | Mineral powder | Sand and sand | Stone | Water and its preparation method | Water reducing agent | Internal curing agent |
| Datum | 400 | 50 | 110 | 605 | 1070 | 144 | 13.2 | |
| Comparative example 2 | 400 | 50 | 110 | 605 | 1070 | 144 | 13.2 | 11.0 |
TABLE 6 results of Performance test of the high-strength concrete obtained in comparative example 2
| Group of | Shrinkage expansion ratio (%) | Compressive strength (MPa) | Electric flux (C) | Depth of carbonization (mm) |
| Age of age | 28d | 28d | 56d | 56d |
| Datum | -0.056 | 74.1 | 735 | 3.35 |
| Comparative example 2 | -0.050 | 70.4 | 675 | 3.42 |
After the concrete test piece is molded and hardened, compared with a standard group without the internal curing agent, the shrinkage rate of the concrete in the 28d age is reduced by 10% in terms of volume stability, the compressive strength of the concrete in the 28d age in terms of mechanical property is reduced by 5% in terms of standard curing, the electric flux of the concrete in the 56d age in terms of durability is reduced by 60 ℃ in terms of standard curing, and the carbonization depth is increased by 2%.
Comparative example 3
The preparation method of the high-strength concrete internal curing agent comprises the following steps:
1) Adding 5000 parts of water into a beaker, weighing 0.5 part of composite nonionic surfactant according to a composite proportion of 1:3 by mass of fatty alcohol polyoxyethylene ether and isomeric tridecanol polyoxyethylene ether, adding the mixture into the water, and placing the mixture into a water bath at 50 ℃ for stirring and dissolving; then adding 20 parts of sodium silicate solution (the mass concentration is 35%) and 80 parts of methyldimethoxy silane, fully stirring for 40min, then slowly adding 0.5 part of ammonia water (the mass concentration is 25%), rapidly stirring (the stirring rate is 300 r/min) for 10-15 min while adding, and then sealing and marking as a polymer A;
2) Simultaneously with the step 1), adding microcrystalline muscovite ultrafine powder (particle size D) into a three-neck flask 90 Bulk density=0.40 g/cm =10 μm 3 ) 45 parts of alginate fiber powder (fiber strength: 1.8d, average particle diameter: 60 μm) 15 parts, N9 parts of methylene bisacrylamide (chemical purity) and 8500 parts of water, the mixture is initially stirred for 40min at normal temperature, 1000 parts of acrylic acid (analytically pure) is added, the temperature is raised to 50 ℃, the stirring is continued for 15min, two electrodes are inserted for discharging for 8min at 500V, the temperature is raised to 60 ℃, the full stirring reaction is continued for 15min, and the mixture is cooled to the room temperature and marked as a polymer B;
3) And mixing and stirring the polymer A and the polymer B for 100min, neutralizing with NaOH (30%) until the neutralization degree is 90%, washing with distilled water for several times, washing with ethanol, sealing, putting into a 50 ℃ oven for 24h, removing the seal, and putting into a dryer for drying for 5h to obtain the high-strength concrete internal curing agent.
Through tests, the internal nutrient obtained in the comparative example has the tap water absorption rate of 280g/g and the water retention rate of 83.3% after soaking for 24 hours; the water retention and water release properties of the obtained internal curing agent are obviously reduced.
Comparative example 4
The preparation method of the high-strength concrete internal curing agent comprises the following steps:
1) Adding 5000 parts of distilled water into a beaker, taking hexadecyl trimethyl ammonium bromide as 0.5 part of cationic surfactant, adding into water, and placing into a water bath at 50 ℃ for stirring and dissolving; then adding 20 parts of sodium silicate solution (the mass concentration is 35%) and 80 parts of methyldimethoxy silane, fully stirring for 40min, then slowly adding 0.5 part of ammonia water (the mass concentration is 25%), rapidly stirring (the stirring rate is 300 r/min) for 10-15 min while adding, and then sealing and marking as a polymer A;
2) Simultaneously with the step 1), adding microcrystalline muscovite ultrafine powder (particle size D) into a three-neck flask 90 Bulk density=0.20 g/cm =3 μm 3 ) 45 parts of alginate fiber powder (fiber strength: 1.8d, average particle diameter of 30 mu m) 15 parts, 9 parts of N, N-methylene bisacrylamide (chemical purity) and 8500 parts of distilled water, primarily stirring the mixture at normal temperature for 40min, then adding 1000 parts of acrylic acid (analytical purity), raising the temperature to 65 ℃, adding 0.5 part of initiator potassium persulfate (analytical purity), continuously stirring for 30min, performing polymerization reaction (strictly controlling the reaction progress and the adding rate of reactants), cooling to the room temperature, and marking as a polymer B;
3) And mixing and stirring the obtained polymer A and the polymer B for 100min, neutralizing with NaOH (30%) until the neutralization degree is 90%, washing with distilled water for several times, washing with ethanol, sealing, putting into a 50 ℃ oven for 24h, removing the seal, and putting into a dryer for drying for 5h to obtain the high-strength concrete internal curing agent.
Through tests, the high-strength concrete internal curing agent obtained in the comparative example has the tap water absorption rate of 265g/g and the water retention rate of 81.2% after soaking for 24 hours; in addition, in the step 2), the initiator is used for replacing discharge electrolysis reaction, so that the control of the reaction process is difficult, and the problem that the polymerization reaction is generated due to uneven mixing is easy to occur.
The concrete internal curing agent obtained in the comparative example is applied to the preparation of high-strength concrete (C60 grade), and the concrete internal curing agent comprises the following specific steps:
the internal curing agent is fully stirred in water, and coarse aggregate, fine aggregate and cementing material (the total design dosage is 560kg/m 3 ) Dry stirring in a stirrer for 40s, and finally pouring the internal curing mixed solution into the stirrer for fully stirring for 3min, and controlling the slump of the concrete to be (200+/-20) mm by adjusting the dosage of the water reducer; the specific compounding ratios are shown in Table 7 below; the results of the performance test of the obtained concrete are shown in Table 8.
TABLE 7 concrete mix (kg/m) 3 )
| Group of | Cement and its preparation method | Fly ash | Mineral powder | Sand and sand | Stone | Water and its preparation method | Water reducing agent | Internal curing agent |
| Datum | 400 | 50 | 110 | 605 | 1070 | 144 | 13.2 | |
| Comparative example 4 | 400 | 50 | 110 | 605 | 1070 | 144 | 13.2 | 11.0 |
TABLE 8 results of Performance test of the high-strength concrete obtained in comparative example 4
| Group of | Shrinkage expansion ratio (%) | Compressive strength (MPa) | Electric flux (C) | Depth of carbonization (mm) |
| Age of age | 28d | 28d | 56d | 56d |
| Datum | -0.056 | 73.8 | 740 | 3.26 |
| Comparative example 4 | -0.049 | 73.6 | 655 | 3.25 |
After the concrete test piece is molded and hardened, compared with a standard group without the internal curing agent, the shrinkage rate of the concrete in 28d age is reduced by 12% in terms of volume stability, the compressive strength of the concrete in 28d age in terms of mechanical property is basically leveled, the electric flux in 56d age is reduced by 85 ℃ in terms of durability, and the carbonization depth is leveled with the standard.
The invention is not limited to the embodiments described above, but a number of modifications and adaptations can be made by a person skilled in the art without departing from the principle of the invention, which modifications and adaptations are also considered to be within the scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (10)
1. The preparation method of the high-strength concrete internal curing agent is characterized by comprising the following steps of:
1) Dissolving a composite nonionic surfactant in water, adding a sodium silicate solution and methyldimethoxy silane into the water, and stirring the mixture; then adding ammonia water under stirring, and uniformly mixing to obtain a polymer A; wherein the composite nonionic surfactant consists of fatty alcohol polyoxyethylene ether and isomeric tridecanol polyoxyethylene ether;
2) Uniformly mixing microcrystalline muscovite ultrafine powder, alginate fiber powder, N-methylene bisacrylamide and water, primarily stirring the obtained mixture at normal temperature, then adding acrylic acid, heating and uniformly stirring, performing glow discharge electrolysis plasma treatment, then performing heating and stirring reaction, and cooling to room temperature to obtain a polymer B;
3) And mixing and stirring the polymer A and the polymer B, neutralizing until the neutralization degree is more than 90%, washing and drying to obtain the internal curing agent.
2. The method of claim 1, wherein the fine micro-fine muscovite powder has a particle size D 90 Not more than 3 μm, loose density not more than 0.20g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Sand content less than or equal to 0.2%, siO 2 The content is 45-48%, al 2 O 3 The content is 25-30%; the average grain diameter of the alginate fiber powder is 30-40 mu m.
3. The preparation method of the composite nonionic surfactant according to claim 1, wherein the mass ratio of the fatty alcohol-polyoxyethylene ether to the isomeric tridecyl alcohol-polyoxyethylene ether in the composite nonionic surfactant is 1 (1-1.5).
4. The preparation method according to claim 1, wherein the raw materials adopted in the step 1) and the parts by weight thereof comprise: 0.5 to 1 part of composite nonionic surfactant, 20 to 25 parts of sodium silicate solution, 75 to 80 parts of methyldimethoxy silane and 0.5 to 1 part of ammonia water.
5. The preparation method according to claim 1, wherein the mass concentration of the sodium silicate solution is 30-40%; the mass concentration of the ammonia water is 25-28%.
6. The preparation method according to claim 1, wherein the raw materials adopted in the step 2) and the parts by weight thereof comprise: 45-50 parts of micro-crystal muscovite ultrafine powder, 10-15 parts of alginate fiber powder, 8-10 parts of N, N-methylene bisacrylamide, 8250-9000 parts of water and 900-1100 parts of acrylic acid.
7. The method of claim 1, wherein the glow discharge electrolytic plasma treatment step comprises: the discharge reaction is carried out for 2 to 3 mm under the voltage conditions of 180 to 220V, 480 to 520V and 780 to 820V in sequence.
8. The method according to claim 1, wherein the mixing and stirring time in step 3) is 100 to 120 minutes.
9. The high-strength concrete internal curing agent prepared by the preparation method of any one of claims 1 to 8.
10. The application of the high-strength concrete internal curing agent in high-strength concrete as claimed in claim 9, wherein the mixing amount of the high-strength concrete internal curing agent in the high-strength concrete is 1.8-2.2% of the mass of the cementing material.
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