CN116854438A - Ultralow-temperature seat slurry for wind power steel-concrete tower, and preparation method and application thereof - Google Patents
Ultralow-temperature seat slurry for wind power steel-concrete tower, and preparation method and application thereof Download PDFInfo
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- CN116854438A CN116854438A CN202311118249.8A CN202311118249A CN116854438A CN 116854438 A CN116854438 A CN 116854438A CN 202311118249 A CN202311118249 A CN 202311118249A CN 116854438 A CN116854438 A CN 116854438A
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- 239000002002 slurry Substances 0.000 title claims abstract description 67
- 239000004567 concrete Substances 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000004568 cement Substances 0.000 claims abstract description 9
- 239000003469 silicate cement Substances 0.000 claims abstract description 4
- 238000006703 hydration reaction Methods 0.000 claims description 19
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical group C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 18
- 230000036571 hydration Effects 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 235000012241 calcium silicate Nutrition 0.000 claims description 17
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 17
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical class O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 15
- 239000003638 chemical reducing agent Substances 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 13
- 239000013530 defoamer Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- 239000011398 Portland cement Substances 0.000 claims description 11
- 239000000701 coagulant Substances 0.000 claims description 11
- 239000004033 plastic Substances 0.000 claims description 11
- 239000011150 reinforced concrete Substances 0.000 claims description 11
- 229910052593 corundum Inorganic materials 0.000 claims description 10
- 239000010431 corundum Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 229910052925 anhydrite Inorganic materials 0.000 claims description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000001509 sodium citrate Substances 0.000 claims description 6
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000011707 mineral Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 4
- 229910052602 gypsum Inorganic materials 0.000 claims description 4
- 239000010440 gypsum Substances 0.000 claims description 4
- 239000005995 Aluminium silicate Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 235000012211 aluminium silicate Nutrition 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical group [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 3
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000004156 Azodicarbonamide Substances 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical group NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims description 2
- 235000019399 azodicarbonamide Nutrition 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 239000011863 silicon-based powder Substances 0.000 claims description 2
- 239000002518 antifoaming agent Substances 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 6
- 239000013538 functional additive Substances 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 239000002250 absorbent Substances 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000000740 bleeding effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011178 precast concrete Substances 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- IQDXNHZDRQHKEF-UHFFFAOYSA-N dialuminum;dicalcium;dioxido(oxo)silane Chemical compound [Al+3].[Al+3].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O IQDXNHZDRQHKEF-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 230000000366 juvenile effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- 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
- C04B28/06—Aluminous cements
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of cement-based building materials, in particular to ultralow-temperature seat slurry for a wind power steel-concrete tower, and a preparation method and application thereof. The invention utilizes the synergistic effect of silicate cement and special high-activity cementing material, prepares the high-performance seat slurry by using graded aggregate and functional additive, solves the application technical problem in ultralow temperature environment, and meets the technical requirement of splicing and mounting of the wind power steel-concrete tower in ultralow temperature environment.
Description
Technical Field
The invention relates to the technical field of cement-based building materials, in particular to ultralow-temperature seat slurry for a wind power steel-concrete tower, and a preparation method and application thereof.
Background
Wind power generation is one of important components for the development and utilization of new energy. The steel-concrete tower is widely applied to land wind energy structural facilities as a novel structural form, the technology can effectively improve the generated energy of a large impeller and a high-hub wind turbine generator, wherein the connection of a connecting steel frame and a precast concrete tower section, the connection of the precast concrete tower section and base slurry of a foundation is one of weak links, and therefore the selection of the base slurry plays a key role in the safety and service life of the whole steel-concrete tower.
The seat slurry for splicing and installing the wind power steel-concrete tower consists of high-activity cementing material, fine aggregate and functional additive, has higher mechanical property and better fatigue resistance, and has the characteristics of micro expansion and no shrinkage. Because the vertical splicing of the wind power mixing tower concrete segments and the filling of the horizontal joints of the tower barrel ring segments are required to be sealed by adopting on-site stirring of seat slurry, in practical engineering application, the performance of the seat slurry cannot well meet the low-temperature application requirements of the engineering in winter, particularly, the seat slurry is frozen in the environment with the temperature as low as about-20 ℃, the early strength is almost absent, the later strength is slowly developed, and the construction requirements cannot be met. Therefore, developing high-performance ultralow temperature seat slurry is important to realizing the installation of the concrete tower in an ultralow temperature environment.
However, there are relatively few studies in the prior art regarding seat slurries, and few references are available, so there is a gap in the study of ultra-low temperature seat slurry material systems. Patent document CN106630871A discloses a seat slurry for filling gaps of assembled components and a preparation method thereof, CN108424065A discloses a seat slurry which can be used as a seat slurry at connecting joints of assembled concrete prefabricated components, the seat slurry has the advantages of early strength, high strength, micro-expansion, good durability, CN109516737A discloses a seat slurry, a preparation method and application thereof, early strength is high, fluidity is good, segregation is avoided, bleeding is avoided, micro-expansion is avoided, cost is controllable, CN111423196A discloses a continuous graded iron tailing sand seat slurry composition which adopts continuous graded iron tailing sand to replace quartz sand, the problems that the consistency of traditional seat slurry materials is not up to national standard, loss is fast, 1d expansion rate is not up to standard, early and later strength is not high, later volume stability is poor and the like are effectively solved, CN112341093A discloses a sealing seat slurry matched with PC building component installation, the slurry is low in shrinkage after solidification, compact and hard in texture and strong in anti-seepage and anti-deformation capacity, CN114573308A discloses a seat slurry for wind power steel-concrete tower installation construction, CN115057679A discloses a special 100MPa non-shrinkage seat slurry for wind power steel-concrete towers, the special 100MPa non-shrinkage seat slurry has the characteristics of high strength and non-shrinkage, has excellent workability, ensures cohesiveness and water retention, has good plasticity to meet the requirement of fluidity, realizes overall optimization of fluidity, water retention and cohesiveness, does not detect low-temperature construction performance, and CN114853436A discloses a low-temperature seat slurry and a use method thereof, has high mechanical property in a short term at low temperature as low as-5 ℃ and even at low temperature as low as-10 ℃, has long-term use efficiency and is excellent, but does not detect ultra-low-temperature environment performance.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the ultralow-temperature seat slurry for the wind-power steel-concrete tower, which is prepared by utilizing the synergistic effect of silicate cement and special high-activity cementing materials and using graded aggregate and functional additives, solves the technical problem of application in an ultralow-temperature environment, and meets the technical requirement of splicing and installing the wind-power steel-concrete tower in the ultralow-temperature environment.
Specifically, the ultralow-temperature seat slurry for the wind power reinforced concrete tower comprises the following raw materials in parts by weight: 30-50 parts of cement, 1-10 parts of hydration accelerator, 1-5 parts of superfine admixture, 1-5 parts of modified metakaolin, 20-40 parts of basalt sand, 1-10 parts of corundum micropowder, 0.01-0.5 part of plastic expanding agent, 0.01-0.3 part of internal curing agent, 0.01-0.2 part of retarder, 0.1-0.5 part of coagulant, 0.01-0.3 part of defoamer and 0.1-1 part of water reducer.
Wherein the cement is superfineThe weight ratio of the high belite sulphoaluminate clinker to the P.I 52.5 superfine Portland cement is 5-5.5:4.5-6.5, wherein the belite content in the superfine high belite sulphoaluminate clinker is more than or equal to 40%, the free gypsum content is 16-18%, and the specific surface area of the clinker is 650-700m 2 Perkg, P.I 52.5 superfine Portland cement with specific surface area of 550-650m 2 /kg. The belite in the superfine high belite sulphoaluminate clinker is modified by free gypsum, has higher activity, and the anhydrous calcium sulphoaluminate in the clinker has high early hydration heat release rate, and the belite has both early and later strength and has greater contribution to later strength; and P.I 52.5 ultrafine Portland cement improves higher alkalinity in the hydration process and promotes the low-temperature hydration of belite in clinker.
Preferably, the hydration promoter is amorphous calcium aluminate mineral C 12 A 7 And the mass ratio of the mixture to the anhydrite is 6-6.5:3.5-4.5. At about-20deg.C, amorphous C is used 12 A 7 The advantages of rapid hydration and superhigh heat release in the hydration juvenile period make up the problems that the mixed water of the seat slurry is frozen under the ultralow temperature condition, the hydration slurry is slow to harden or not harden, and the amorphous C is the same time 12 A 7 The formation of ettringite, a reaction product with anhydrite, can promote the normal increase in early and late compressive strength of the hardened slurry. On the other hand, the amorphous calcium aluminate minerals are subjected to superfine powder modification treatment to reach the micro-nano level, the specific surface area is large, the activity is higher, the pores of the cement hardening slurry can be effectively filled, the microstructure of the hardening slurry is improved, and the mechanical property of the hardening slurry is improved.
Preferably, the preparation process of the modified metakaolin comprises the following steps: mixing and grinding kaolin and carbide slag according to the mass ratio of 10:1-2, preserving heat for 0.5-2h at 600-680 ℃, taking out, rapidly cooling to room temperature by cold air, and grinding again to the average particle size of 2-5 mu m. The modified metakaolin prepared by the method disclosed by the invention has amorphous high-activity aluminum calcium silicate minerals, and simultaneously has the function of improving the thixotropy of the slurry.
Preferably, the superfine admixture is superfine fly ash with a specific surface area of 650-700m 2 /kg. The invention can reduce the viscosity of slurry and improve the viscosity by means of the spherical form of superfine fly ashSlurry workability.
The invention is to prepare the qualified wind-powered electricity generation steel-concrete tower to use the ultra-low temperature seat sizing agent, at first, need to meet the basic construction requirement, must meet the mechanical property growth under the ultra-low temperature environment at the same time, therefore, the invention adopts P.I 52.5 superfine Portland cement to match with superfine high belite sulphoaluminate clinker, add hydration accelerator and superfine admixture, and assist in modifying metakaolin, can meet the plastic construction requirement of the seat sizing agent, the invention is under the ultra-low temperature-20 ℃ environment, C in the hydration accelerator 12 A 7 The hydration reaction generated by the cooperation of the anhydrite ensures the hydration process of the composite cement in the ultralow temperature environment, the hardened body generated by the hydration of the cementing material is not damaged by the ice crystal pressure in the ultralow temperature environment, and the early-stage and later-stage compressive strength increasing requirements of the seat slurry are met.
Preferably, the fineness modulus of the basalt sand is 1.7-2.0, and the grain size of corundum micro powder is 200-300 meshes. The combination of the two aggregates can improve the overall compactness of the mortar and further improve the compressive strength and the elastic modulus of the hardened body.
Preferably, the plastic expanding agent is azodicarbonamide.
Preferably, the internal curing agent is SAP water-absorbent resin particles with the particle size of 0.1-0.3mm.
Preferably, the retarder is citric acid and sodium citrate, and the mass ratio of the citric acid to the sodium citrate is 1:1.8-2.1.
Preferably, the coagulant is lithium carbonate.
Preferably, the defoamer is an organosilicon powder defoamer.
Preferably, the water reducer is a polycarboxylic acid powder water reducer.
The invention also relates to a preparation method of the ultralow-temperature seat slurry for the wind power reinforced concrete tower, which comprises the following steps: taking the raw materials according to the weight parts, uniformly mixing and packaging.
The invention also relates to application of the ultralow-temperature seat slurry for the wind power reinforced concrete tower, and in particular relates to the application of the seat slurry powder in the mass ratio of 1:0.1-0.12 by adding water and uniformly mixing.
Detailed Description
To characterize the technical effect of the invention, the initial fluidity of the seat slurry at-20 ℃ is tested according to the technical scheme of the invention, after the test piece is molded and cured to the relevant test age, the compressive strength, the flexural strength and the drying shrinkage are tested, wherein-1 d means curing 1d in the environment of-20 ℃, 3d means curing 3d in the environment of-20 ℃, 7d+21d means curing 7d in the environment of-20 ℃ and then transferring to standard condition curing 21d. In the test process, the mass ratio of the fixed powder to water is 1:0.12, the belite content in the superfine high belite sulphoaluminate clinker is 42%, the free gypsum content is 16%, and the specific surface area of the clinker is 660m 2 Perkg, P.I 52.5 ultrafine Portland cement with a specific surface area of 590m 2 The hydration promoter is amorphous calcium aluminate mineral C 12 A 7 The mixture with the mass ratio of the anhydrite to the anhydrite is 6:4, and the preparation process of the modified metakaolin comprises the following steps: mixing and grinding kaolin and carbide slag according to a mass ratio of 10:1.5, preserving heat for 1h at 620 ℃, taking out, rapidly cooling to room temperature by cold air, grinding again to an average particle size of 4 mu m, wherein the specific surface area of the superfine fly ash is 670m 2 /kg. The fineness modulus of basalt sand is 2.0, the grain diameter of corundum micro powder is 200-300 meshes, the grain diameter of SAP water-absorbing resin is 0.1-0.3mm, retarder is citric acid and sodium citrate, the mass ratio of the citric acid to the sodium citrate is 1:1.8, coagulant is lithium carbonate, defoamer is organic silicon powder defoamer, and water reducer is polycarboxylic acid powder water reducer.
Examples
The ultralow-temperature seat slurry for the wind power steel-concrete tower comprises the following raw materials in parts by weight: 22 parts of superfine high belite sulphoaluminate clinker, 22 parts of P.I. 52.5 superfine Portland cement, 6 parts of hydration accelerator, 2.5 parts of ultrafine fly ash, 2 parts of modified metakaolin, 32 parts of basalt sand, 8 parts of corundum micropowder, 0.25 part of plastic expansion agent, 0.1 part of SAP water-absorbent resin particles, 0.09 part of retarder, 0.3 part of coagulant, 0.2 part of defoamer and 0.5 part of water reducer.
The test shows that under the curing condition of minus 20 ℃, the seat slurry has 142mm of initial fluidity and good workability, does not flow, has 38.6MPa of minus 1d compressive strength, 65.7MPa of minus 3d compressive strength, 95.8MPa of minus 7d+21d compressive strength, 12.5MPa of minus 7d+21d flexural strength, and has minus 0.05 percent of dry shrinkage rate of minus 7d+21d and has 35.0GPa of static elastic modulus.
Comparative example 1
The seat slurry consists of the following raw materials in parts by weight: 28 parts of R.SAC52.5-grade quick hardening sulphoaluminate cement, 22 parts of P.I 52.5 superfine silicate cement, 2.5 parts of ultrafine fly ash, 2 parts of modified metakaolin, 32 parts of basalt sand, 8 parts of corundum micropowder, 0.25 part of plastic expansion agent, 0.1 part of SAP water-absorbent resin particles, 0.09 part of retarder, 0.3 part of coagulant, 0.2 part of defoamer and 0.5 part of water reducer.
The test shows that under the curing condition of minus 20 ℃, the seat slurry has the advantages of 135mm of initial fluidity, good workability, no flowing, 18.2MPa of minus 1d compressive strength, 34.5MPa of minus 3d compressive strength, 39.5MPa of minus 7d+21d compressive strength, 3.6MPa of minus 7d+21d flexural strength, minus 7d+21d dry shrinkage of minus 0.03 percent and 14.5GPa of static elastic modulus.
Comparative example 2
The seat slurry consists of the following raw materials in parts by weight: 22 parts of superfine high belite sulphoaluminate clinker, 28 parts of P.I. 52.5 superfine Portland cement, 2.5 parts of superfine fly ash, 2 parts of modified metakaolin, 32 parts of basalt sand, 8 parts of corundum micropowder, 0.25 part of plastic expansion agent, 0.1 part of SAP water-absorbent resin particles, 0.09 part of retarder, 0.3 part of coagulant, 0.2 part of defoamer and 0.5 part of water reducer.
The test shows that under the curing condition of minus 20 ℃, the initial fluidity of the seat slurry is 165mm, the workability is general, the slight flow is realized, the compressive strength of minus 1d is 25.8MPa, the compressive strength of minus 3d is 38.9MPa, the compressive strength of minus 7d+21d is 52.6MPa, the flexural strength of minus 7d+21d is 4.9MPa, the drying shrinkage rate of minus 7d+21d is minus 0.02 percent, and the static elastic modulus is 18GPa.
Comparative example 3
The seat slurry consists of the following raw materials in parts by weight: 22 parts of superfine high belite sulphoaluminate clinker, 22 parts of P.I. 52.5 superfine Portland cement, 6 parts of hydration accelerator, 4.5 parts of ultrafine fly ash, 32 parts of basalt sand, 8 parts of corundum micropowder, 0.25 part of plastic expansion agent, 0.1 part of SAP water-absorbent resin particles, 0.09 part of retarder, 0.3 part of coagulant, 0.2 part of defoamer and 0.5 part of water reducer.
Through detection, under the curing condition of minus 20 ℃, the initial fluidity of the seat slurry is 200mm, the workability is poor, the flowing is serious, the compressive strength of minus 1d is 30.2MPa, the compressive strength of minus 3d is 55.1MPa, the compressive strength of minus 7d+21d is 72.5MPa, the flexural strength of minus 7d+21d is 6.8MPa, the drying shrinkage rate of minus 7d+21d is minus 0.04%, and the static elastic modulus is 26.5GPa.
Comparative example 4
The seat slurry consists of the following raw materials in parts by weight: 22 parts of superfine high belite sulphoaluminate clinker, 22 parts of P.I. 52.5 superfine Portland cement, 6 parts of hydration accelerator, 2.5 parts of ultrafine fly ash, 2 parts of modified metakaolin, 40 parts of basalt sand, 0.25 part of plastic expansion agent, 0.1 part of SAP water-absorbent resin particles, 0.09 part of retarder, 0.3 part of coagulant, 0.2 part of defoamer and 0.5 part of water reducer.
Through detection, under the curing condition of minus 20 ℃, the initial fluidity of the seat slurry is 190mm, the slurry is slightly bleeding, the compressive strength of minus 1d is 25.9MPa, the compressive strength of minus 3d is 50.2MPa, the compressive strength of minus 7d+21d is 69.7MPa, the flexural strength of minus 7d+21d is 6.6MPa, the drying shrinkage rate of minus 7d+21d is minus 0.08%, and the static elastic modulus is 23.6GPa.
Comparative example 5
The seat slurry consists of the following raw materials in parts by weight: 52 parts of P.O52.5 ordinary Portland cement, 2.5 parts of superfine fly ash, 2 parts of metakaolin, 32 parts of basalt sand, 8 parts of corundum micro powder, 0.25 part of plastic expansion agent, 0.19 part of retarder, 0.3 part of coagulant, 0.2 part of defoamer and 0.5 part of water reducer.
Through detection, under the curing condition of minus 20 ℃, the initial fluidity of the seat slurry is 210mm, the workability is poor, the slurry flows, the compressive strength of minus 1d is 2.5MPa, the compressive strength of minus 3d is 8.5MPa, the compressive strength of minus 7d+21d is 15.0MPa, the flexural strength of minus 7d+21d is 1.8MPa, the drying shrinkage rate of minus 7d+21d is minus 0.04%, and the static elastic modulus is 6.3GPa.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limited thereto; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features can be replaced with equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The ultralow temperature seat slurry for the wind power reinforced concrete tower is characterized by comprising the following raw materials in parts by weight: 30-50 parts of cement, 1-10 parts of hydration accelerator, 1-5 parts of superfine admixture, 1-5 parts of modified metakaolin, 20-40 parts of basalt sand, 1-10 parts of corundum micropowder, 0.01-0.5 part of plastic expanding agent, 0.01-0.3 part of internal curing agent, 0.01-0.2 part of retarder, 0.1-0.5 part of coagulant, 0.01-0.3 part of defoamer and 0.1-1 part of water reducer;
the cement is a mixture of superfine high belite sulphoaluminate clinker and P.I 52.5 superfine silicate cement with the mass ratio of 5-5.5:4.5-6.5, wherein the belite content in the superfine high belite sulphoaluminate clinker is more than or equal to 40%, the free gypsum content is 16-18%, and the clinker specific surface area is 650-700m 2 Per kg, P.I 52.5 superfine Portland cement with specific surface area of 550-650m 2 /kg；
The hydration promoter is amorphous calcium aluminate mineral C 12 A 7 A mixture with a mass ratio of 6-6.5:3.5-4.5 with anhydrite;
the preparation process of the modified metakaolin comprises the following steps: mixing and grinding kaolin and carbide slag according to the mass ratio of 10:1-2, preserving heat for 0.5-2h at 600-680 ℃, taking out, rapidly cooling to room temperature by cold air, and grinding again to the average particle size of 2-5 mu m.
2. The ultra-low temperature seat slurry for a wind power reinforced concrete tower according to claim 1, wherein the ultra-fine admixture is ultra-fine fly ash, and the specific surface area is 650-700m 2 /kg。
3. The ultra-low temperature seat slurry for a wind power reinforced concrete tower according to claim 1, wherein the fineness modulus of basalt sand is 1.7-2.0, and the grain size of corundum micro powder is 200-300 meshes.
4. The ultra-low temperature seat slurry for a wind turbine reinforced concrete tower according to claim 1, wherein the plastic expanding agent is azodicarbonamide.
5. The ultra-low temperature seat slurry for a wind power reinforced concrete tower according to claim 1, wherein the internal curing agent is SAP water-absorbing resin particles with the particle size of 0.1-0.3mm.
6. The ultralow temperature seat slurry for the wind power steel-concrete tower, according to claim 1, is characterized in that the retarder is citric acid and sodium citrate, and the mass ratio of the citric acid to the sodium citrate is 1:1.8-2.1.
7. The ultra-low temperature seat slurry for a wind turbine reinforced concrete tower according to claim 1, wherein the coagulant is lithium carbonate.
8. The ultra-low temperature seat slurry for a wind power reinforced concrete tower according to claim 1, wherein the defoaming agent is an organic silicon powder defoaming agent, and the water reducing agent is a polycarboxylic acid powder water reducing agent.
9. The method for preparing the ultralow temperature seat slurry for the wind power reinforced concrete tower according to any one of claims 1 to 8, comprising the following steps: taking the raw materials according to the weight parts, uniformly mixing and packaging.
10. The use of ultralow temperature seat slurry for wind power steel-concrete towers according to any one of claims 1-8, wherein the seat slurry powder is uniformly mixed with water in the mass ratio of 1:0.1-0.12.
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