Ultrahigh performance grouting material for offshore wind power jacket under low temperature environment and application thereof

Abstract

The application relates to a low-temperature environment ultra-high-performance grouting material for offshore wind power guide frames and application thereof, and comprises the following components: cement 25-40 parts, fine aggregate 32-45 parts, early strength agent 1-10 parts, ultra-fine mineral admixture 5-15 parts, expanding agent 0.1-1 part, early strength type powder water reducing agent 0.01-0.5 part, defoaming agent 0.1-1 part, retarder 0.01-0.15 part and steel fiber 0.1-5 parts. The application has the beneficial effects that: the cement-based grouting material with low-temperature type ultra-high mechanical performance and 28-day uniaxial tensile strength is prepared through the synergistic effect of cementing material mineral reconstruction and aggregate gradation design; and the cement-based grouting material only needs to be directly mixed with mixing water in application, and secondary stirring premixing is not needed, and the stirring time is short.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cement-based building materials, and particularly relates to a super-high-performance grouting material for offshore wind power guide pipe frames in a low-temperature environment and application thereof. BACKGROUND

[0002] Offshore wind turbines are developing towards large-scale and deep-sea space, and the construction of wind turbine foundations is becoming more and more difficult. At present, offshore wind power mainly adopts the form of guide pipe frame foundation structure, and the reliability of the grouting connection section determines the safety and reliability of the entire wind turbine foundation.

[0003] Offshore wind power construction in low-temperature environment has always been a technical difficulty. The cement hydration hardening is slow in a low-temperature environment, which leads to the working property and mechanical property of the grouting material for guide pipe frames failing to meet the design requirements, resulting in the offshore wind power pedestal grouting material being monopolized by foreign products. The low-temperature early-strength high-strength underwater grouting material described in CN 105622006 A can meet the underwater grouting under the condition of 5 DEG C, but the 28d strength is only 82.8 MPa at most. The low-temperature early-strength grouting material for offshore wind power guide pipe frames described in CN 118307272 A can reach 153 MPa in 28d compressive strength under the condition of 2 DEG C, but the tensile strength, elastic limit tensile strength and the like are still insufficient. Offshore wind turbines are developing towards large-scale and deep-sea space, and the grouting material for offshore wind power guide pipe frames needs to be optimized in terms of mechanical property and durability to adapt to the development trend of offshore wind power. SUMMARY

[0004] The purpose of the present application is to overcome the deficiencies in the prior art, and to provide a super-high-performance grouting material for offshore wind power guide pipe frames in a low-temperature environment and application thereof. The grouting material is modified on the basis of the existing low-temperature type guide pipe frame grouting material with lower water material ratio and higher mechanical property, and short steel fibers are added to improve the compressive strength, tensile strength, elastic limit tensile strength and other properties of the material, so as to meet the application requirements of the grouting material for offshore wind power guide pipe frames in large-scale wind turbine units.

[0005] In a first aspect, a super-high-performance grouting material for offshore wind power guide pipe frames in a low-temperature environment is provided, which is composed of the following raw materials by weight:

[0006] cement 25-40 parts, fine aggregate 32-45 parts, early strength agent 1-10 parts, ultra-fine mineral admixture 5-15 parts, expanding agent 0.1-1 part, early strength type powder water reducing agent 0.01-0.5 part, defoaming agent 0.1-1 part, retarder 0.01-0.15 part, and steel fiber 0.1-5 parts.

[0007] As a preferred option, the cement is composed of white portland cement and ultra-fine portland cement, and the mass ratio of the white portland cement to the ultra-fine portland cement is (4.5-7):(3.5-6).

[0008] As preferred, the fine aggregate comprises basalt sand and corundum powder; the basalt sand has a particle size consisting of four continuous gradations in the range of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh; the mass ratio of the basalt sand of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh and the corundum powder is (1-2):(3-4):(2-3):(1-2):(1-2).

[0009] As preferred, the early strength agent is a mixture of high-activity inorganic minerals and gypsum, and the mass ratio of the high-activity inorganic minerals to the gypsum is (6.5-7.0):(3.0-4.0); the high-activity inorganic minerals comprise calcium aluminate and calcium silicate.

[0010] As preferred, the super-fine mineral admixture is a mixture of super-fine fly ash, silica fume, and mineral powder, and the mass ratio of the super-fine fly ash, the silica fume, and the mineral powder is (3-4):(1-2):(6-7).

[0011] As preferred, the expansive agent is at least one of a plastic expansive agent and a mineral expansive agent; when the expansive agent is a composite of the plastic expansive agent and the mineral expansive agent, the mass ratio of the plastic expansive agent to the mineral expansive agent is 1-2:100; the plastic expansive agent is azodicarbonamide, and the mineral expansive agent is HP-CSA expansive agent.

[0012] As preferred, the early-strength type powder water-reducing agent is a polycarboxylic acid early-strength type powder water-reducing agent; the defoaming agent is an organic silicon-based defoaming agent; and the steel fiber is a flat copper-plated steel fiber with a length of 2.5-3.0 mm and a diameter of 0.1-0.2 mm.

[0013] In a second aspect, a preparation method of the grouting material is provided, and the method comprises the following steps:

[0014] S1, mixing cement, active admixture, and fine aggregate, and stirring uniformly to obtain solid powder A;

[0015] S2, mixing powdered water-reducing agent, retarder, early strength agent, composite expansive agent, and defoaming agent, and stirring uniformly to obtain solid powder B;

[0016] S3, mixing the solid powder A and the solid powder B to obtain powder mixture C, then adding water to the powder mixture C at a water-to-material ratio of 0.08-0.10, stirring for 3-5 min until the mixture is uniform and has no lumps, then adding steel fibers uniformly according to the proportion, and stirring for 7-10 min to obtain the grouting material.

[0017] As preferred, in S3, the total mixing time of the solid powder A, the solid powder B, and the steel fibers is 10-15 min.

[0018] In a third aspect, the application provides use of the grouting material according to any one of the first aspect in a low-temperature environment for an ultra-high-performance offshore wind power jacket.

[0019] The application has the following advantages: the application, through the synergistic effect of mineral reconstruction of cementitious materials and aggregate gradation design, prepares a low-temperature type cement-based grouting material with ultra-high mechanical properties and 28-day uniaxial tensile strength, which has a 28d compressive strength of ≥160MPa, a tensile strength of ≥10.0MPa, an elastic limit tensile strength of ≥8.0MPa, and a static elastic modulus of ≥50.0GPa at 2℃. Moreover, the cement-based grouting material of the application only needs to be directly mixed with mixing water for application, without the need for secondary stirring and premixing, and the stirring time is short. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A preparation method flow chart of the jacket grouting material is provided in the application;

[0021] Figure 2 A compressive strength diagram of the jacket grouting material is provided in the application;

[0022] Figure 3 A flexural strength diagram of the jacket grouting material is provided in the application. DETAILED DESCRIPTION

[0023] The application will be further described below in conjunction with examples. The following examples are only used to help understand the application. It should be pointed out that, for ordinary people in the technical field, several modifications can be made to the application without departing from the principles of the application, and these improvements and modifications also fall within the protection scope of the claims of the application.

[0024] Example 1:

[0025] The application provides a grouting material for an ultra-high-performance offshore wind power jacket in a low-temperature environment, which is composed of the following raw materials in parts by weight:

[0026] Cement 35 parts, fine aggregate 35 parts, early strength agent 5 parts, ultra-fine mineral admixture 10 parts, composite expansion agent 0.2 parts, early strength type powder water reducing agent 0.3 parts, defoaming agent 0.1 parts, retarder 0.15 parts, and steel fiber 0.5 parts.

[0027] Through detection, the grouting material has an initial fluidity of 360mm, a 1d compressive strength of 91.5MPa, a 3d compressive strength of 104.2MPa, a 28d compressive strength of 140.4MPa, a flexural strength of 17.5MPa, a tensile strength of 9.0MPa, an elastic limit tensile strength of 7.0MPa, and an elastic modulus of 45GPa.

[0028] The steel fiber is a straight copper-plated steel fiber with a length of 2.8mm and a diameter of 0.2mm.

[0029] The application also provides a method for preparing the grouting material, as shown in the specification, comprising: Figure 1

[0030] S1, mixing cement, active admixture and fine aggregate, stirring uniformly to obtain solid powder A.

[0031] The cement is composed of white Portland cement and ultra-fine Portland cement, the white Portland cement is P•W52.5 grade, wherein the C3S mineral content is not less than 70%; the ultra-fine Portland cement is P•I52.5 grade, the specific surface area is 650-7000 m 2 / kg. The ratio of the two is 6.0:4.0.

[0032] The fine aggregate is basalt sand and corundum powder, the particle size of the basalt sand is composed of four continuous gradations in the particle size range of 10-20 mesh, 20-40 mesh, 40-70 mesh and 70-120 mesh, and the corundum powder is 200-300 mesh. The mass ratio of 10-20 mesh, 20-40 mesh, 40-70 mesh, 70-120 mesh quartz sand and corundum powder is 1:4:2:2:1.

[0033] The mineral admixture is a mixture of ultra-fine fly ash, silica fume and mineral powder, the fly ash is microbeads with D50 of 1-3 μm, the mineral powder is S140 ultra-fine mineral powder with D50 of 3-5 μm, and the silica fume has D50 of 1-2 μm. The mass ratio of the mixture of ultra-fine fly ash, silica fume and mineral powder is 4:2:7.

[0034] S2, mixing powdered water reducing agent, retarder, early strength agent, composite expansion agent and defoaming agent, stirring uniformly to obtain solid powder B.

[0035] The early strength agent is a mixture of high-activity inorganic minerals mainly composed of calcium aluminate and calcium silicate and gypsum with a mass ratio of 6.0:4.0, and the preparation process of the high-activity inorganic minerals is as follows: uniformly mixing CaO, Al2O3 and SiO2 in a mass ratio of 1:0.6:0.2, pressing into tablets, calcining at 2000-2100℃ to liquid phase, keeping for 15 min, and then rapidly cooling by water flow to obtain a solid powder which is then ground into a powder. The gypsum is anhydrite, and the mixture is obtained by mixing the two in a fixed ratio and then modifying by air mill ultra-fine grinding, with a specific surface area of 900 cm 2 / g.

[0036] The expansion agent is at least one of plastic expansion agent and mineral expansion agent. More preferably, the expansion agent is a composite of plastic expansion agent and mineral expansion agent, and the mass ratio of the two is 2:100. More preferably, the plastic expansion agent is azodicarbonamide, and the mineral expansion agent is HP-CSA expansion agent.

[0037] ​The early-strength powder water reducing agent is selected from Zhongjianzili Zhongyan Science and Technology high-performance polycarboxylic early-strength powder water reducing agent.

[0038] The defoaming agent is an organic silicon defoaming agent.

[0039] S3, mixing the solid powder A and the solid powder B to obtain a powder mixture C, then adding water to the powder mixture C according to a water-material ratio of 0.090, stirring for 4 min until the mixture is uniform and has no caking, then uniformly adding the steel fibers according to the ratio, stirring for 8 min, and obtaining the grouting material.

[0040] In S3, the total stirring time of the solid powder A, the solid powder B and the steel fibers is 12 min.

[0041] In addition, after the grouting material is prepared, the bubbles in the slurry can be discharged by standing, and finally delivered to a grouting machine for pumping construction, so as to realize the application of the grouting material in the ultra-high performance offshore wind power guide pipe rack in a low temperature environment. The standing time is 1 min.

[0042] Example 2:

[0043] The application provides a grouting material for an ultra-high performance offshore wind power guide pipe rack in a low temperature environment, which is prepared from the following raw materials by weight:

[0044] cement 35 parts, fine aggregate 40 parts, early-strength agent 5 parts, ultra-fine mineral admixture 10 parts, composite expansion agent 0.2 parts, early-strength powder water reducing agent 0.5 parts, defoaming agent 0.1 parts, retarder 0.15 parts, and steel fibers 5 parts.

[0045] The steel fibers are straight copper-plated steel fibers with a length of 2.8 mm and a diameter of 0.2 mm.

[0046] The application also provides a preparation method of the grouting material, as shown in Figure 1 , which comprises the following steps:

[0047] S1, mixing cement, active admixture and fine aggregate to obtain a solid powder A.

[0048] The cement is composed of white portland cement and ultra-fine portland cement, the white portland cement is P•W 52.5 grade, and the content of C3S mineral is not less than 70%; the ultra-fine portland cement is P•I 52.5 grade, and the specific surface area is 650-7000 m 2 / kg. The ratio of the two is 7:3.5.

[0049] The fine aggregate is basalt sand and corundum powder, the particle size of the basalt sand is composed of continuous gradation in four particle size ranges of 10-20 mesh, 20-40 mesh, 40-70 mesh and 70-120 mesh, and the corundum powder is 200-300 mesh.

[0050] The mineral admixture is a mixture of ultra-fine fly ash, silica fume and mineral powder, the fly ash is microbeads with D50 of 1-3 μm, the mineral powder is S140 ultra-fine mineral powder with D50 of 3-5 μm, and the silica fume has D50 of 1-2 μm. The mass ratio of the mixture of ultra-fine fly ash, silica fume and mineral powder is 4:1:5.

[0051] S2, the powdered water reducing agent, retarder, early strength agent, composite expansion agent and defoaming agent are mixed and stirred uniformly to obtain solid powder B.

[0052] The early strength agent is a mixture of high-activity inorganic minerals mainly of calcium aluminate and calcium silicate and gypsum with a mass ratio of 7.0:3.0, and the preparation process of the high-activity inorganic minerals is as follows: CaO, Al2O3 and SiO2 are uniformly mixed in a mass ratio of 1:0.8:0.2, pressed into tablets, calcined to liquid phase at 2000-2100℃, and then cooled by water flow for 15 min, and the obtained solid is ground into powder. The gypsum is anhydrite, and the mixture is obtained by modifying the mixture through air flow grinding after mixing in a fixed ratio, and the specific surface area of the mixture is 950 cm 2 / g.

[0053] The expansion agent is at least one of plastic expansion agent and mineral expansion agent. More preferably, the expansion agent is a composite of plastic expansion agent and mineral expansion agent, and the mass ratio of the two is 1.5:100. More preferably, the plastic expansion agent is azodicarbonamide, and the mineral expansion agent is HP-CSA expansion agent.

[0054] The early strength type powder water reducing agent is selected from the high-performance polycarboxylic early strength type powder water reducing agent of Zhongjiancai Zhongshi Technology.

[0055] The defoaming agent is an organic silicon-based defoaming agent.

[0056] S3, the solid powder A and the solid powder B are mixed and stirred uniformly to obtain powder mixture C, then water is added to the powder mixture C in a water-material ratio of 0.08, stirred for 5 min until the mixture is uniform and has no lumps, then the steel fibers are added uniformly according to the proportion, stirred for 10 min, and the grouting material is prepared.

[0057] In S3, the total mixing time of the solid powder A, the solid powder B and the steel fibers is 15 min.

[0058] In addition, after the grouting material is prepared, the bubbles in the slurry can be discharged by standing, and finally delivered to the grouting machine for pumping construction, so as to realize the application of the grouting material in the ultra-high performance offshore wind power guide pile in a low temperature environment. The standing time is 3 minutes.

[0059] It is detected that the initial fluidity of the grouting material is 330 mm, the 1d compressive strength is 108.5 MPa, the 3d compressive strength is 110.5 MPa, the 28d compressive strength is 160.4 MPa, the flexural strength is 21.5 MPa, the tensile strength is 10.5 MPa, the elastic limit tensile strength is 9.0 MPa, and the elastic modulus is 52 GPa.

[0060] Example 3:

[0061] The application provides a grouting material for an ultra-high performance offshore wind power guide pile in a low temperature environment, which is prepared from the following raw materials by weight:

[0062] Cement 33 parts, fine aggregate 32 parts, early strength agent 8 parts, ultra-fine mineral admixture 8 parts, composite expansion agent 0.2 parts, early strength type powder water reducing agent 0.4 parts, defoaming agent 0.1 parts, retarder 0.1 parts, and steel fiber 5 parts.

[0063] The steel fiber is straight copper-plated steel fiber, with a length of 3 mm and a diameter of 0.2 mm.

[0064] The application further provides a preparation method of the grouting material, as shown in the following scheme: Figure 1 The preparation method comprises the following steps:

[0065] S1, mixing cement, active admixture and fine aggregate, and stirring uniformly to obtain solid powder A.

[0066] The cement is composed of white portland cement and ultra-fine portland cement, the white portland cement is P•W52.5 grade, and the C3S mineral content is not less than 70%; the ultra-fine portland cement is P•I52.5 grade, and the specific surface area is 650-7000 m 2 / kg. The ratio of the two is 5:5.

[0067] The fine aggregate is basalt sand and corundum powder, the particle size of the basalt sand is composed of four particle size ranges of 10-20 mesh, 20-40 mesh, 40-70 mesh and 70-120 mesh in continuous gradation, and the corundum powder is 200-300 mesh. The mass ratio of 10-20 mesh, 20-40 mesh, 40-70 mesh, 70-120 mesh quartz sand and corundum powder is 1:4:3:1:1.

[0068] The mineral admixture is a mixture of superfine fly ash, silica fume and mineral powder, the fly ash is microbead with D50 of 1-3 μm, the mineral powder is S140 superfine mineral powder with D50 of 3-5 μm, and the silica fume has D50 of 1-2 μm. The mass ratio of the mixture of the superfine fly ash, the silica fume and the mineral powder is 3:1:6.

[0069] S2, the powdered water reducing agent, the retarder, the early strength agent, the composite expansion agent and the defoaming agent are mixed and stirred uniformly to obtain solid powder B.

[0070] The early strength agent is a mixture of high-activity inorganic minerals mainly including calcium aluminate and calcium silicate and gypsum with a mass ratio of 6.5:4. The high-activity inorganic minerals are prepared by uniformly mixing CaO, Al2O3 and SiO2 with a mass ratio of 1:0.6:0.2, pressing into a sheet, calcining at 2000-2100 ℃ to a liquid phase, keeping for 15 min, and rapidly cooling by water flow to obtain a solid powder which is ground into a powder. The gypsum is anhydrite. The mixture is obtained by modifying the mixture of the two by airflow milling and superfine grinding to have a specific surface area of 1000 cm 2 / g.

[0071] The expansion agent is at least one of a plastic expansion agent and a mineral expansion agent. More preferably, the expansion agent is a composite of the plastic expansion agent and the mineral expansion agent with a mass ratio of 1:100. More preferably, the plastic expansion agent is azodicarbonamide and the mineral expansion agent is HP-CSA expansion agent.

[0072] The early strength type powder water reducing agent is selected from the high-performance polycarboxylic early strength type powder water reducing agent of Zhongjiancai Zhongke Science and Technology.

[0073] The defoaming agent is an organic silicon-based defoaming agent.

[0074] S3, the solid powder A and the solid powder B are mixed and stirred uniformly to obtain powder mixture C. Then, the powder mixture C is added with water at a water-material ratio of 0.085, stirred for 5 min until the mixture is uniform and has no lumps. Then, the steel fibers are added uniformly according to the proportion, stirred for 10 min, and the grouting material is prepared.

[0075] In S3, the total mixing time of the solid powder A, the solid powder B and the steel fibers is 15 min.

[0076] In addition, after the grouting material is prepared, the bubbles in the slurry can be discharged by standing, and finally delivered to a grouting machine for pumping construction, so as to realize the application of the grouting material in the ultra-high performance offshore wind power guide pipe frame in a low temperature environment. The standing time is 3 min.

[0077] The grouting material has an initial fluidity of 335 mm, a 1d compressive strength of 112.5 MPa, a 3d compressive strength of 125.2 MPa, a 28d compressive strength of 167.4 MPa, a bending strength of 24.7 MPa, a tensile strength of 11.0 MPa, an elastic limit tensile strength of 9.5 MPa, and an elastic modulus of 55 GPa.

[0078] The grouting material prepared according to the ratio has good working performance, and optimal mechanical properties such as compressive strength, bending strength, tensile strength, elastic limit tensile strength, and elastic modulus, wherein the bending strength is about 24 MPa, the compressive strength is about 167 MPa, and the tensile strength is about 11 MPa, which are all higher than those of the prior art. Figures 2-3 Corresponding.

[0079] Example 4:

[0080] The application provides a grouting material for an offshore wind power guide pipe frame under a low-temperature environment, which is prepared from the following raw materials in parts by weight:

[0081] cement 40 parts, fine aggregate 40 parts, early strength agent 1 part, ultra-fine mineral admixture 5 parts, composite expansion agent 0.1 part, early strength type powder water reducing agent 0.5 part, defoaming agent 0.1 part, retarder 0.15 part, and steel fiber 5 parts.

[0082] The steel fiber is straight copper-plated steel fiber, with a length of 2.8 mm and a diameter of 0.2 mm.

[0083] The application further provides a preparation method of the grouting material, as shown in the following formula: Figure 1 The preparation method comprises the following steps:

[0084] S1, mixing cement, active admixture and fine aggregate, and stirring uniformly to obtain solid powder A.

[0085] The cement is composed of white Portland cement and ultra-fine Portland cement, the white Portland cement is P•W52.5 grade, and the C3S mineral content is not less than 70%; the ultra-fine Portland cement is P•I52.5 grade, and the specific surface area is 650-7000 m 2 / kg. The ratio of the two is 4.5:6.

[0086] The fine aggregate is basalt sand and corundum powder, the particle size of the basalt sand is composed of four continuous gradations in the particle size ranges of 10-20 mesh, 20-40 mesh, 40-70 mesh and 70-120 mesh, and the corundum powder is 200-300 mesh. The mass ratio of 10-20 mesh, 20-40 mesh, 40-70 mesh, 70-120 mesh quartz sand and corundum powder is 1:4:2:2:1.

[0087] The mineral admixture is a mixture of superfine fly ash, silica fume and mineral powder, the fly ash is microbead with D50 of 1-3 μm, the mineral powder is S140 superfine mineral powder with D50 of 3-5 μm, and the silica fume has D50 of 1-2 μm. The mass ratio of the mixture of the superfine fly ash, the silica fume and the mineral powder is 3:1:6.

[0088] S2, the powdered water reducing agent, the retarder, the early strength agent, the composite expansion agent and the defoaming agent are mixed and stirred uniformly to obtain solid powder B.

[0089] The early strength agent is a mixture of high-activity inorganic minerals mainly composed of calcium aluminate and calcium silicate and gypsum with a mass ratio of 7:3. The high-activity inorganic mineral is prepared by uniformly mixing CaO, Al2O3 and SiO2 with a mass ratio of 1:0.6:0.2, pressing into a sheet, calcining at 2000-2100 ℃ to a liquid phase, keeping for 15 min, and rapidly cooling by water flow to obtain a solid powder which is ground into a powder. The gypsum is anhydrite. The two are mixed in a fixed ratio and modified by air flow grinding to obtain a mixture with a specific surface area of 950 cm 2 / g.

[0090] The expansion agent is at least one of a plastic expansion agent and a mineral expansion agent. More preferably, the expansion agent is a composite of a plastic expansion agent and a mineral expansion agent with a mass ratio of 1.5:100. More preferably, the plastic expansion agent is azodicarbonamide and the mineral expansion agent is HP-CSA expansion agent.

[0091] The early strength type powder water reducing agent is selected from the high-performance polycarboxylic early strength type powder water reducing agent of Zhongjiancai Zhongyan Science and Technology.

[0092] The defoaming agent is an organic silicon-based defoaming agent.

[0093] S3, the solid powder A and the solid powder B are mixed and stirred uniformly to obtain powder mixture C. Then, the powder mixture C is added with water in a water-material ratio of 0.08, stirred for 3 min until the mixture is uniform and has no lumps. Then, the steel fibers are added uniformly according to the proportion, stirred for 7 min, and the grouting material is prepared.

[0094] In S3, the total mixing time of the solid powder A, the solid powder B and the steel fibers is 10 min.

[0095] In addition, after the grouting material is prepared, the bubbles in the slurry can be discharged by standing, and finally delivered to the grouting machine for pumping construction, so as to realize the application of the grouting material in the ultra-high performance offshore wind power guide pipe rack in a low temperature environment. The standing time is 3 min.

[0096] The grouting material has initial fluidity of 320 mm, 1d compressive strength of 97.5 MPa, 3d compressive strength of 108.2 MPa, 28d compressive strength of 155.4 MPa, flexural strength of 20.7 MPa, tensile strength of 9.5 MPa, elastic limit tensile strength of 8.3 MPa, and elastic modulus of 48 GPa.

[0097] Example 5:

[0098] The cement is 25 parts, the fine aggregate is 45 parts, the early strength agent is 10 parts, the ultra-fine mineral admixture is 15 parts, the expansion agent is 1 part, the early strength type powder water reducing agent is 0.01 part, the defoaming agent is 1 part, the retarder is 0.01 part, and the steel fiber is 0.1 part.

[0099] The steel fiber is a flat copper-plated steel fiber, with a length of 2.5 mm and a diameter of 0.1 mm.

[0100] The application also provides a preparation method of the grouting material, as shown in the method, comprising: Figure 1 as shown, comprising:

[0101] S1, mixing the cement, the active admixture and the fine aggregate, and stirring uniformly to obtain a solid powder A.

[0102] The cement is composed of white Portland cement and ultra-fine Portland cement, the white Portland cement is P•W52.5 grade, and the content of C3S mineral is not less than 70%; the ultra-fine Portland cement is P•I52.5 grade, and the specific surface area is 650-7000 m 2 / kg. The ratio of the two is 5:5.

[0103] The fine aggregate is basalt sand and corundum powder, the particle size of the basalt sand is composed of four particle size ranges of 10-20 mesh, 20-40 mesh, 40-70 mesh and 70-120 mesh, and the corundum powder is 200-300 mesh. The mass ratio of 10-20 mesh, 20-40 mesh, 40-70 mesh, 70-120 mesh quartz sand and corundum powder is 1:4:2:2:1.

[0104] The mineral admixture is a mixture of ultra-fine fly ash, silica fume and mineral powder, the fly ash is microbeads with D50 of 1-3 μm, the mineral powder is S140 ultra-fine mineral powder with D50 of 3-5 μm, and the silica fume has D50 of 1-2 μm. The mass ratio of the mixture of ultra-fine fly ash, silica fume and mineral powder is 3:1:6.

[0105] S2, mixing the powdered water reducing agent, the retarder, the early strength agent, the composite expansion agent and the defoaming agent, and stirring uniformly to obtain a solid powder B.

[0106] The early strength agent is a mixture of high-activity inorganic minerals mainly of calcium aluminate and calcium silicate and gypsum in a mass ratio of 7:3. The preparation process of the high-activity inorganic minerals is as follows: CaO, Al2O3 and SiO2 are uniformly mixed in a mass ratio of 1:0.6:0.2, pressed into a sheet, calcined to a liquid phase at 2000-2100 DEG C, and kept for 15 min, and then rapidly cooled by water flow to obtain a solid, which is ground into a powder. The gypsum is anhydrite, and the mixture is obtained by mixing the two in a fixed ratio and modifying by superfine grinding with an air flow mill to have a specific surface area of 950 cm 2 / g.

[0107] The expanding agent is at least one of a plastic expanding agent and a mineral expanding agent. More preferably, the expanding agent is a composite of a plastic expanding agent and a mineral expanding agent in a mass ratio of 2:100. More preferably, the plastic expanding agent is azodicarbonamide, and the mineral expanding agent is HP-CSA expanding agent.

[0108] The early strength type powder water reducing agent is selected from Zhijiancai Zhongyan Science and Technology high-performance polycarboxylic acid early strength type powder water reducing agent.

[0109] The defoaming agent is an organic silicon-based defoaming agent.

[0110] S3, the solid powder A and the solid powder B are uniformly mixed to obtain a powder mixture C, then water is added to the powder mixture C in a water / powder ratio of 0.10, stirred for 5 min until the mixture is uniform and has no lumps, then the steel fibers are uniformly added according to the proportion, stirred for 10 min, and the grouting material is prepared.

[0111] In S3, the total mixing time of the solid powder A, the solid powder B and the steel fibers is 15 min.

[0112] In addition, after the grouting material is prepared, the bubbles in the slurry can be discharged by standing, and finally delivered to the grouting machine for pumping construction, so as to realize the application of the grouting material in the ultra-high performance offshore wind power guide pipe frame in a low temperature environment. The standing time is 1-3 min.

[0113] It is detected that the initial fluidity of the grouting material is 310 mm, the 1d compressive strength is 110.5 MPa, the 3d compressive strength is 123.4 MPa, the 28d compressive strength is 150.3 MPa, the flexural strength is 20.9 MPa, the tensile strength is 9.0.0 MPa, the elastic limit tensile strength is 8.5 MPa, and the elastic modulus is 50 GPa.

[0114] Comparative Example 1:

[0115] The application also provides a preparation method of the grouting material, as shown in Figure 1 , which comprises the following steps:

[0116] S1, mixing cement, active admixture and fine aggregate, and stirring uniformly to obtain a solid powder A.

[0117] The cement is composed of white Portland cement and superfine Portland cement, the white Portland cement is P•W52.5 grade, the content of C3S mineral is not less than 70%, the superfine Portland cement is P•I52.5 grade, the specific surface area is 650-7000m 2 / kg, and the ratio of the two is 6.5:3.5.

[0118] The fine aggregate is basalt sand and corundum powder, the particle size of the basalt sand is composed of four continuous gradations in the range of 10-20 mesh, 20-40 mesh, 40-70 mesh and 70-120 mesh, and the corundum powder is 200-300 mesh. The mass ratio of 10-20 mesh, 20-40 mesh, 40-70 mesh, 70-120 mesh quartz sand and corundum powder is 1:4:3:1:1.

[0119] The mineral admixture is a mixture of superfine fly ash, silica fume and mineral powder, the fly ash is microbeads with D50 of 1-3μm, the mineral powder is S140 superfine mineral powder with D50 of 3-5μm, and the silica fume has D50 of 1-2μm. The mass ratio of the mixture of superfine fly ash, silica fume and mineral powder is 3:1:6.

[0120] S2, mix the powdered water reducing agent, retarder, early strength agent, composite expansion agent and defoaming agent, and stir them uniformly to obtain solid powder B.

[0121] The early strength agent is a mixture of high-activity inorganic minerals mainly composed of calcium aluminate and calcium silicate and gypsum with a mass ratio of 6.5:3.5, and the preparation process of the high-activity inorganic minerals is as follows: uniformly mix CaO, Al2O3 and SiO2 in a mass ratio of 1:0.6:0.2, press into tablets, calcine at 2000-2100℃ to liquid phase, keep warm for 15min, and then rapidly cool by water flow to obtain a solid which is then ground into powder. The gypsum is anhydrite, and the mixture is obtained by modifying the mixture of the two by airflow milling to a specific surface area of 1000cm 2 / g.

[0122] The expansion agent is at least one of plastic expansion agent and mineral expansion agent. More preferably, the expansion agent is a composite of plastic expansion agent and mineral expansion agent with a mass ratio of 1:100. More preferably, the plastic expansion agent is azodicarbonamide, and the mineral expansion agent is HP-CSA expansion agent.

[0123] The early strength type powder water reducing agent is selected from the high-performance polycarboxylic early strength type powder water reducing agent of Zhongjiancai Zhongshi Technology.

[0124] The defoaming agent is an organic silicon-based defoaming agent.

[0125] S3, mixing the solid powder A and the solid powder B to obtain a powder mixture C, then adding water to the powder mixture C according to a water-material ratio of 0.085, stirring for 5 min until the mixture is uniform and no lump is formed, then adding the steel fibers according to the proportion, and stirring for 10 min to obtain the grouting material.

[0126] In S3, the total stirring time of the solid powder A, the solid powder B and the steel fibers is 15 min.

[0127] In addition, after the grouting material is prepared, the bubbles in the slurry can be discharged by standing, and finally delivered to a grouting machine for pumping construction, so as to realize the application of the grouting material in the ultra-high performance offshore wind power guide pipe support in a low temperature environment. The standing time is 3 min.

[0128] It is detected that the initial fluidity of the grouting material is 370 mm, the 1d compressive strength is 86.5 MPa, the 3d compressive strength is 100.2 MPa, the 28d compressive strength is 132.4 MPa, the flexural strength is 14.8 MPa, the tensile strength is 7.5 MPa, the elastic limit tensile strength is 6.0 MPa, and the elastic modulus is 37 GPa.

[0129] Comparative Example 2:

[0130] A grouting material for an ultra-high performance offshore wind power guide pipe support in a low temperature environment, comprising the following raw materials by weight:

[0131] cement 35 parts, fine aggregate 30 parts, early strength agent 5 parts, ultra-fine mineral admixture 10 parts, composite expansion agent 0.2 parts, early strength type powder water reducing agent 0.5 parts, defoaming agent 0.1 parts, and retarder 0.15 parts.

[0132] The application also provides a preparation method of the grouting material, as shown in the following formula: Figure 1 The preparation method comprises the following steps:

[0133] S1, mixing cement, active admixture and fine aggregate to obtain a solid powder A.

[0134] The cement is composed of white portland cement and ultra-fine portland cement, the white portland cement is P•W52.5 grade, and the content of C3S mineral is not less than 70%; the ultra-fine portland cement is P•I52.5 grade, and the specific surface area is 650-7000 m 2 / kg. The ratio of the two is 5:5.

[0135] The fine aggregate is basalt sand and corundum powder, the particle size of the basalt sand is composed of continuous gradation in four particle size ranges of 10-20 mesh, 20-40 mesh, 40-70 mesh and 70-120 mesh, and the corundum powder is 200-300 mesh.

[0136] The mineral admixture is a mixture of ultra-fine fly ash, silica fume and mineral powder, the fly ash is microbeads with D50 of 1-3 μm, the mineral powder is S140 ultra-fine mineral powder with D50 of 3-5 μm, and the silica fume has D50 of 1-2 μm. The mass ratio of the mixture of ultra-fine fly ash, silica fume and mineral powder is 3:1:6.

[0137] S2, the powdered water reducing agent, retarder, early strength agent, composite expansion agent and defoaming agent are mixed and stirred uniformly to obtain solid powder B.

[0138] The early strength agent is a mixture of high-activity inorganic minerals mainly of calcium aluminate and calcium silicate and gypsum with a mass ratio of 7:3, and the preparation process of the high-activity inorganic minerals is as follows: CaO, Al2O3 and SiO2 are uniformly mixed in a mass ratio of 1:0.6:0.2, pressed into tablets, calcined at 2000-2100℃ to liquid phase, and then cooled by water flow, and the obtained solid is ground into powder. The gypsum is anhydrite, and the mixture is obtained by modifying the mixture through air mill ultra-fine grinding, and the specific surface area of the mixture is 950 cm 2 / g.

[0139] The expansion agent is at least one of plastic expansion agent and mineral expansion agent. More preferably, the expansion agent is a composite of plastic expansion agent and mineral expansion agent, and the mass ratio of the two is 1.5:100. More preferably, the plastic expansion agent is azodicarbonamide, and the mineral expansion agent is HP-CSA expansion agent.

[0140] The early strength type powder water reducing agent is selected from the high-performance polycarboxylic early strength type powder water reducing agent of Zhongjiancai Zhongke Technology.

[0141] The defoaming agent is an organic silicon-based defoaming agent.

[0142] S3, the solid powder A and the solid powder B are mixed and stirred uniformly to obtain powder mixture C, then water is added to the powder mixture C according to a water-material ratio of 0.085, and stirred for 5 min until the mixture is uniform and has no lumps, then the steel fibers are uniformly added according to the proportion, and stirred for 10 min to prepare the grouting material.

[0143] In S3, the total mixing time of the solid powder A, the solid powder B and the steel fibers is 15 min.

[0144] In addition, after the grouting material is prepared, the bubbles in the slurry can be discharged by standing, and finally delivered to the grouting machine for pumping construction, realizing the application of the grouting material in the ultra-high performance offshore wind power jacket in low temperature environment. The standing time is 1-3 min.

[0145] It is detected that the initial fluidity of the grouting material is 350 mm, the 1d compressive strength is 98.0 MPa, the 3d compressive strength is 111.5 MPa, the 28d compressive strength is 156.7 MPa, the flexural strength is 22.0 MPa, the tensile strength is 7.5 MPa, the elastic limit tensile strength is 6.5 MPa, and the elastic modulus is 50 GPa.

[0146] In Comparative Example 1 and Comparative Example 2, no steel fiber is added in the material components, and the mechanical properties such as compressive strength, tensile strength, elastic limit tensile strength and elastic modulus of the final mixture are lower than those of the sample with steel fiber. In Example 2, 5% mass fraction of steel fiber is added, the 28d compressive strength is 167.4 MPa, the flexural strength is 24.7 MPa, the tensile strength is 11.0 MPa, the elastic limit tensile strength is 9.5 MPa, and the elastic modulus is 55 GPa. The grouting material prepared by this ratio has the best mechanical properties, which reflects the good combination of steel fiber and mortar slurry in low temperature environment, and the performance of hardened body is significantly improved.

Claims

1. A high-performance grouting material for offshore wind turbine jackets in low-temperature environments, characterized in that, Composed of the following raw materials in parts by weight: Cement 25-40 parts, fine aggregate 32-45 parts, early-strength agent 1-10 parts, ultrafine mineral admixture 5-15 parts, expanding agent 0.1-1 part, early-strength powder water-reducing agent 0.01-0.5 parts, defoamer 0.1-1 part, retarder 0.01-0.15 parts, steel fiber 0.1-5 parts. The cement is composed of white silicate cement and ultrafine silicate cement, with a mass ratio of (4.5-7):(3.5-6). The early strength agent is a mixture of highly active inorganic minerals and gypsum, wherein the mass ratio of the highly active inorganic minerals to gypsum is (6.5-7.0):(3.0-4.0); the highly active inorganic minerals include calcium aluminate and calcium silicate. The fine aggregate includes basalt sand and corundum powder; the basalt sand is continuously graded within four particle size ranges: 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh; the mass ratio of basalt sand of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh to corundum powder is (1-2): (3-4): (2-3): (1-2): (1-2); The ultrafine mineral admixture is a mixture of ultrafine fly ash, silica fume, and mineral powder, with a mass ratio of (3-4):(1-2):(6-7).

2. The grouting material for ultra-high performance offshore wind turbine jacket foundations under low-temperature environments as described in claim 1, characterized in that, The expanding agent is at least one of a plastic expanding agent and a mineral expanding agent; when the expanding agent is a composite of a plastic expanding agent and a mineral expanding agent, the mass ratio of the plastic expanding agent to the mineral expanding agent is 1-2:100; the plastic expanding agent is azodicarbonamide, and the mineral expanding agent is HP-CSA expanding agent.

3. The grouting material for ultra-high performance offshore wind turbine jacket foundations under low-temperature environments according to claim 2, characterized in that, The early-strength powder water-reducing agent is a polycarboxylate early-strength powder water-reducing agent; the defoamer is an organosilicon defoamer; the steel fiber is a straight copper-plated steel fiber with a length of 2.5-3.0 mm and a diameter of 0.1-0.2 mm.

4. A method for preparing the grouting material as described in any one of claims 1 to 3, characterized in that, include: S1. Mix cement, active admixture and fine aggregate, stir evenly to obtain solid powder A; S2. Mix the powdered water-reducing agent, retarder, early strength agent, composite expansion agent and defoamer, and stir evenly to obtain solid powder B; S3. Mix solid powder A and solid powder B, stir evenly to obtain powder mixture C, then add water to powder mixture C at a water-to-material ratio of 0.08 to 0.10, stir for 3 to 5 minutes until the mixture is uniform and free of lumps, then add steel fibers evenly according to the ratio, stir for 8 to 10 minutes to obtain grouting material.

5. The method for preparing grouting material according to claim 4, characterized in that, In S3, the total mixing time for solid powder A, solid powder B, and steel fiber is 10-15 minutes.

6. An application of the grouting material as described in any one of claims 1 to 3 in ultra-high performance offshore wind turbine jacket structures under low-temperature environments.

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