Ultrahigh-performance grouting material for offshore wind power jacket in low-temperature environment and application of grouting material

Abstract

The invention relates to an ultrahigh-performance grouting material for an offshore wind power jacket in a low-temperature environment and application of the grouting material. The grouting material is prepared from 25 to 40 parts of cement, 32 to 45 parts of fine aggregate, 1 to 10 parts of early strength agent, 5 to 15 parts of superfine mineral admixture, 0.1 to 1 part of expanding agent, 0.01 to 0.5 part of early strength type powder water reducing agent, 0.1 to 1 part of defoaming agent, 0.01 to 0.15 part of retarder and 0.1 to 5 parts of steel fiber. The low-temperature cement-based grouting material has the beneficial effects that the low-temperature cement-based grouting material with ultrahigh mechanical property and 28-day uniaxial tensile strength is prepared through the synergistic effect of cementing material mineral reconstruction and aggregate grading design; moreover, when the cement-based grouting material is applied, the cement-based grouting material only needs to be directly mixed with mixing water, secondary stirring and premixing are not needed, and the stirring time is short.

Description

Technical Field

[0001] The present invention belongs to the technical field of cement-based building materials, and in particular relates to a grouting material for an ultra-high-performance offshore wind power conduit frame in a low-temperature environment and an application thereof. Background Art

[0002] As offshore wind turbines grow larger and deeper into the ocean, the construction of wind turbine foundations becomes increasingly challenging. Currently, offshore wind power primarily relies on jacket-based structures, and the reliability of the grouting connections determines the safety and reliability of the entire wind turbine foundation.

[0003] Low-temperature construction of offshore wind power has always been a technical difficulty. Cement hydration and hardening are slow in low-temperature environments, resulting in the workability and mechanical properties of the grouting material for the jacket not meeting design requirements. As a result, offshore wind power base grouting materials have been monopolized by foreign products. The low-temperature, early-strength, high-strength underwater grouting material described in CN 105622006 A can meet the requirements of underwater grouting at 5°C, but the maximum 28-day strength is only 82.8MPa. The low-temperature, early-strength offshore wind power jacket grouting material described in CN 118307272 A can achieve a 28-day compressive strength of 153MPa at 2°C, but its tensile strength and elastic limit tensile strength are still insufficient. Offshore wind turbines are developing towards large-scale and deep-sea spaces. The grouting material for offshore wind power jackets needs to be optimized in terms of mechanical properties and durability to adapt to the development trend of offshore wind power. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide ultra-high-performance offshore wind power jacket grouting materials and their applications in low-temperature environments. The existing low-temperature jacket grouting materials with lower water-to-material ratio and higher mechanical properties are modified by adding short steel fibers to improve the compressive strength, tensile strength, elastic limit tensile strength and other properties of the material, thereby ensuring the application requirements of the offshore wind power jacket grouting materials in large-scale wind turbines.

[0005] Firstly, a grouting material for ultra-high performance offshore wind power pipe frames in low temperature environments is provided, which is composed of the following raw materials in parts by weight: 25-40 parts of cement, 32-45 parts of fine aggregate, 1-10 parts of early strength agent, 5-15 parts of ultrafine mineral admixture, 0.1-1 parts of expansion agent, 0.01-0.5 parts of early strength powder water reducer, 0.1-1 parts of defoaming agent, 0.01-0.15 parts of retarder, and 0.1-5 parts of steel fiber.

[0006] Preferably, the cement is composed of white Portland cement and ultrafine Portland cement, and the mass ratio of white Portland cement to ultrafine Portland cement is (4.5-7): (3.5-6).

[0007] Preferably, the fine aggregate comprises basalt sand and corundum powder; the particle size of the basalt sand is continuously graded within four particle size ranges of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh; the mass ratio of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh basalt sand and corundum powder is (1-2): (3-4): (2-3): (1-2): (1-2).

[0008] Preferably, the early strength agent is a mixture of a highly active inorganic mineral and gypsum, wherein the mass ratio of the highly active inorganic mineral to the gypsum is (6.5-7.0):(3.0-4.0); the highly active inorganic mineral comprises calcium aluminate and calcium silicate.

[0009] Preferably, the ultrafine mineral admixture is a mixture of ultrafine fly ash, silica fume and mineral powder, and the mass ratio of ultrafine fly ash, silica fume and mineral powder is (3-4):(1-2):(6-7).

[0010] Preferably, the expansion agent is at least one of a plastic expansion agent and a mineral expansion agent; when the expansion agent is a composite of a plastic expansion agent and a mineral expansion agent, the mass ratio of the plastic expansion agent to the mineral expansion agent is 1-2:100; the plastic expansion agent is azodicarbonamide, and the mineral expansion agent is HP-CSA expansion agent.

[0011] Preferably, the early-strength powder water-reducing agent is a polycarboxylic acid early-strength powder water-reducing agent; the defoaming agent is a silicone defoaming agent; and 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.

[0012] In a second aspect, a method for preparing the grouting material according to any one of the first aspects is provided, comprising: S1. Mix cement, active admixture and fine aggregate, and stir evenly to obtain solid powder A; S2, mixing the powdered water reducer, retarder, early strength agent, composite expansion agent and defoamer, stirring 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 the 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 evenly add steel fiber according to the proportion, stir for 7 to 10 minutes, and obtain a grouting material.

[0013] Preferably, in S3, the total mixing time of solid powder A, solid powder B and steel fiber is 10-15 minutes.

[0014] In a third aspect, an application of any grouting material as described in the first aspect to an ultra-high performance offshore wind power conductor frame in a low temperature environment is provided.

[0015] The present invention has the following beneficial effects: through the synergistic effect of cementitious material mineral reconstruction and aggregate grading design, the present invention produces a low-temperature, ultra-high mechanical performance and 28-day uniaxial tensile strength cement-based grouting material. At 2°C, the material exhibits a 28-day compressive strength of ≥160 MPa, a tensile strength of ≥10.0 MPa, an ultimate tensile strength of ≥8.0 MPa, and a static elastic modulus of ≥50.0 GPa. Furthermore, the cement-based grouting material of the present invention only needs to be directly mixed with mixing water during use, eliminating the need for secondary premixing and shortening the mixing time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flow chart of a method for preparing the jacket grouting material provided by the present invention; Figure 2 A schematic diagram of the compressive strength of the jacket grouting material provided by the present invention; Figure 3 This is a schematic diagram of the flexural strength of the jacket grouting material provided by the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the following examples. The following examples are provided only to facilitate understanding of the present invention. It should be noted that, without departing from the principles of the present invention, it is possible for a person skilled in the art to make various modifications to the present invention, and such improvements and modifications fall within the scope of the claims of the present invention.

[0018] Example 1: The present application provides an ultra-high performance grouting material for offshore wind power pipe frames in a low temperature environment, which is composed of the following raw materials in parts by weight: 35 parts of cement, 35 parts of fine aggregate, 5 parts of early strength agent, 10 parts of ultrafine mineral admixture, 0.2 parts of composite expansive agent, 0.3 parts of early strength powder water reducer, 0.1 parts of defoaming agent, 0.15 parts of retarder, and 0.5 parts of steel fiber.

[0019] After testing, the initial fluidity of the grouting material is 360mm, the 1d compressive strength is 91.5MPa, the 3d compressive strength is 104.2MPa, the 28d compressive strength is 140.4MPa, the flexural strength is 17.5MPa, the tensile strength is 9.0MPa, the elastic ultimate tensile strength is 7.0MPa, and the elastic modulus is 45GPa.

[0020] The steel fiber is a straight copper-plated steel fiber with a length of 2.8 mm and a diameter of 0.2 mm.

[0021] This application also provides a method for preparing the grouting material, such as Figure 1 Shown, including: S1. Mix cement, active admixture and fine aggregate, stir evenly, and obtain solid powder A.

[0022] The cement is composed of white silicate cement and ultrafine silicate cement. The white silicate cement is of P•W52.5 grade, in which the C3S mineral content is not less than 70%; the ultrafine silicate cement is of P•Ⅰ52.5 grade, with a specific surface area of 650-7000m 2 / kg. The ratio of the two is 6.0:4.0.

[0023] The fine aggregate is basalt sand and corundum powder. The basalt sand particle size is continuously graded within four particle size ranges: 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh. The corundum powder is 200-300 mesh. The mass ratio of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh quartz sand to corundum powder is 1:4:2:2:1.

[0024] The mineral admixture is a mixture of ultrafine fly ash, silica fume, and slag. The fly ash is microbeads with a D50 of 1-3 μm, the slag is S140 ultrafine slag with a D50 of 3-5 μm, and the silica fume has a D50 of 1-2 μm. The mass ratio of the mixture of ultrafine fly ash, silica fume, and slag is 4:2:7.

[0025] S2. Mix the powdered water reducer, retarder, early strength agent, composite expansion agent and defoamer, stir evenly to obtain solid powder B.

[0026] Among them, the early strength agent is a mixture of high-activity inorganic minerals mainly composed of calcium aluminate and calcium silicate and gypsum in a mass ratio of 6.0:4.0. The preparation process of the high-activity inorganic mineral is as follows: CaO, Al2O3 and SiO2 are uniformly mixed in a mass ratio of 1:0.6:0.2, pressed into sheets, calcined at 2000-2100℃ to liquid phase, kept warm for 15 minutes, and rapidly cooled by water flow. The resulting solid powder is ground into powder. Gypsum is anhydrite. After the two are mixed in a fixed ratio, the mixture is modified by ultrafine grinding with a jet mill to obtain a specific surface area of 900cm 2 / g.

[0027] 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 the mass ratio of the plastic expansion agent and the mineral expansion agent being 2:100. More preferably, the plastic expansion agent is azodicarbonamide and the mineral expansion agent is HP-CSA expansion agent.

[0028] The early-strength powder water reducer is selected from the high-performance polycarboxylic acid early-strength powder water reducer of China Building Materials Zhongyan Technology.

[0029] The defoaming agent is a silicone defoaming agent.

[0030] S3. Mix solid powder A and solid powder B, stir evenly to obtain powder mixture C, then add water to the powder mixture C at a water-to-material ratio of 0.090, stir for 4 minutes, until the mixture is uniform and free of lumps, then evenly add steel fiber according to the proportion, stir for 8 minutes, and obtain a grouting material.

[0031] In S3, the total mixing time of solid powder A, solid powder B and steel fiber is 12 minutes.

[0032] Furthermore, the prepared grouting material can be left to rest to allow bubbles to escape, and then transported to a grouting machine for pumping, enabling the application of the grouting material in ultra-high-performance offshore wind turbine jackets in low-temperature environments. The resting time is 1 minute.

[0033] Example 2: The present application provides an ultra-high performance grouting material for offshore wind power pipe frames in a low temperature environment, which is composed of the following raw materials in parts by weight: 35 parts of cement, 40 parts of fine aggregate, 5 parts of early strength agent, 10 parts of ultrafine mineral admixture, 0.2 parts of composite expansive agent, 0.5 parts of early strength powder water reducer, 0.1 parts of defoaming agent, 0.15 parts of retarder, and 5 parts of steel fiber.

[0034] The steel fiber is a straight copper-plated steel fiber with a length of 2.8 mm and a diameter of 0.2 mm.

[0035] This application also provides a method for preparing the grouting material, such as Figure 1 Shown, including: S1. Mix cement, active admixture and fine aggregate, stir evenly, and obtain solid powder A.

[0036] The cement is composed of white silicate cement and ultrafine silicate cement. The white silicate cement is of P•W52.5 grade, in which the C3S mineral content is not less than 70%; the ultrafine silicate cement is of P•Ⅰ52.5 grade, with a specific surface area of 650-7000m 2 / kg. The ratio of the two is 7:3.5.

[0037] The fine aggregate is basalt sand and corundum powder. The basalt sand particle size is continuously graded within four particle size ranges: 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh. The corundum powder is 200-300 mesh. The mass ratio of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh quartz sand to corundum powder is 2:3:2:2:1.

[0038] The mineral admixture is a mixture of ultrafine fly ash, silica fume, and slag. The fly ash is microbeads with a D50 of 1-3 μm, the slag is S140 ultrafine slag with a D50 of 3-5 μm, and the silica fume has a D50 of 1-2 μm. The mass ratio of the mixture of ultrafine fly ash, silica fume, and slag is 4:1:5.

[0039] S2. Mix the powdered water reducer, retarder, early strength agent, composite expansion agent and defoamer, stir evenly to obtain solid powder B.

[0040] Among them, the early strength agent is a mixture of high-activity inorganic minerals mainly composed of calcium aluminate and calcium silicate and gypsum in a mass ratio of 7.0:3.0. The preparation process of the high-activity inorganic mineral is as follows: CaO, Al2O3 and SiO2 are uniformly mixed in a mass ratio of 1:0.8:0.2, pressed into sheets, calcined at 2000-2100℃ to liquid phase, kept warm for 15 minutes, and rapidly cooled by water flow. The obtained solid powder is ground into powder. Gypsum is anhydrite. After the two are mixed in a fixed ratio, the mixture is modified by ultrafine grinding with a jet mill to obtain a specific surface area of 950cm 2 / g.

[0041] 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 the mass ratio of the plastic expansion agent and the mineral expansion agent being 1.5:100. More preferably, the plastic expansion agent is azodicarbonamide and the mineral expansion agent is HP-CSA expansion agent.

[0042] The early-strength powder water reducer is selected from the high-performance polycarboxylic acid early-strength powder water reducer of China Building Materials Zhongyan Technology.

[0043] The defoaming agent is a silicone defoaming agent.

[0044] S3. Mix solid powder A and solid powder B, stir evenly to obtain powder mixture C, then add water to the powder mixture C at a water-to-material ratio of 0.08, stir for 5 minutes, until the mixture is uniform and free of lumps, then evenly add steel fiber according to the proportion, stir for 10 minutes, and obtain a grouting material.

[0045] In S3, the total mixing time of solid powder A, solid powder B and steel fiber is 15 minutes.

[0046] Furthermore, the prepared grouting material can be left to rest for 3 minutes to allow bubbles to escape, before being transported to a grouting machine for pumping. This allows for the application of the grouting material in ultra-high-performance offshore wind turbine jackets in low-temperature environments.

[0047] After testing, the initial fluidity of the grouting material is 330mm, the 1d compressive strength is 108.5MPa, the 3d compressive strength is 110.5MPa, the 28d compressive strength is 160.4MPa, the flexural strength is 21.5MPa, the tensile strength is 10.5MPa, the elastic ultimate tensile strength is 9.0MPa, and the elastic modulus is 52GPa.

[0048] Example 3: The present application provides an ultra-high performance grouting material for offshore wind power pipe frames in a low temperature environment, which is composed of the following raw materials in parts by weight: 33 parts of cement, 32 parts of fine aggregate, 8 parts of early strength agent, 8 parts of ultrafine mineral admixture, 0.2 parts of composite expansive agent, 0.4 parts of early strength powder water reducer, 0.1 parts of defoaming agent, 0.1 parts of retarder, and 5 parts of steel fiber.

[0049] The steel fiber is a straight copper-plated steel fiber with a length of 3 mm and a diameter of 0.2 mm.

[0050] This application also provides a method for preparing the grouting material, such as Figure 1 Shown, including: S1. Mix cement, active admixture and fine aggregate, stir evenly, and obtain solid powder A.

[0051] The cement is composed of white silicate cement and ultrafine silicate cement. The white silicate cement is of P•W52.5 grade, in which the C3S mineral content is not less than 70%; the ultrafine silicate cement is of P•Ⅰ52.5 grade, with a specific surface area of 650-7000m 2 / kg. The ratio of the two is 5:5.

[0052] The fine aggregate is basalt sand and corundum powder. The basalt sand particle size is continuously graded within four particle size ranges: 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh. The corundum powder is 200-300 mesh. The mass ratio of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh quartz sand to corundum powder is 1:4:3:1:1.

[0053] The mineral admixture is a mixture of ultrafine fly ash, silica fume, and mineral powder. The fly ash is microbeads with a D50 of 1-3 μm, the mineral powder is S140 ultrafine mineral powder with a D50 of 3-5 μm, and the silica fume has a D50 of 1-2 μm. The mass ratio of the mixture of ultrafine fly ash, silica fume, and mineral powder is 3:1:6.

[0054] S2. Mix the powdered water reducer, retarder, early strength agent, composite expansion agent and defoamer, stir evenly to obtain solid powder B.

[0055] Among them, the early strength agent is a mixture of high-activity inorganic minerals mainly composed of calcium aluminate and calcium silicate and gypsum in a mass ratio of 6.5:4. The preparation process of the high-activity inorganic mineral is as follows: CaO, Al2O3 and SiO2 are uniformly mixed in a mass ratio of 1:0.6:0.2, pressed into sheets, calcined at 2000-2100℃ to liquid phase, kept warm for 15 minutes, and rapidly cooled by water flow. The resulting solid powder is ground into powder. Gypsum is anhydrite. After the two are mixed in a fixed ratio, the mixture is modified by ultrafine grinding with a jet mill to obtain a mixture with a specific surface area of 1000cm 2 / g.

[0056] 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 the mass ratio of the two being 1:100. More preferably, the plastic expansion agent is azodicarbonamide and the mineral expansion agent is HP-CSA expansion agent.

[0057] The early-strength powder water reducer is selected from the high-performance polycarboxylic acid early-strength powder water reducer of China Building Materials Zhongyan Technology.

[0058] The defoaming agent is a silicone defoaming agent.

[0059] S3. Mix solid powder A and solid powder B, stir evenly to obtain powder mixture C, then add water to the powder mixture C at a water-to-material ratio of 0.085, stir for 5 minutes, until the mixture is uniform and free of lumps, then evenly add steel fiber according to the proportion, stir for 10 minutes, and obtain a grouting material.

[0060] In S3, the total mixing time of solid powder A, solid powder B and steel fiber is 15 minutes.

[0061] Furthermore, the prepared grouting material can be left to rest for 3 minutes to allow bubbles to escape, before being transported to a grouting machine for pumping. This allows for the application of the grouting material in ultra-high-performance offshore wind turbine jackets in low-temperature environments.

[0062] After testing, the initial fluidity of the grouting material is 335mm, the 1d compressive strength is 112.5MPa, the 3d compressive strength is 125.2MPa, the 28d compressive strength is 167.4MPa, the flexural strength is 24.7MPa, the tensile strength is 11.0MPa, the elastic ultimate tensile strength is 9.5MPa, and the elastic modulus is 55GPa.

[0063] The grouting material prepared by this ratio has good working performance, and its mechanical properties such as compressive strength, flexural strength, tensile strength, elastic limit tensile strength, elastic modulus, etc. are the best, among which the flexural strength is about 24MPa, the compressive strength is about 167MPa, and the compressive strength is about 167MPa. Figure 2-3 correspond.

[0064] Example 4: The present application provides an ultra-high performance grouting material for offshore wind power pipe frames in a low temperature environment, which is composed of the following raw materials in parts by weight: 40 parts of cement, 40 parts of fine aggregate, 1 part of early strength agent, 5 parts of ultrafine mineral admixture, 0.1 part of composite expansive agent, 0.5 part of early strength powder water reducer, 0.1 part of defoaming agent, 0.15 part of retarder, and 5 parts of steel fiber.

[0065] The steel fiber is a straight copper-plated steel fiber with a length of 2.8 mm and a diameter of 0.2 mm.

[0066] This application also provides a method for preparing the grouting material, such as Figure 1 Shown, including: S1. Mix cement, active admixture and fine aggregate, stir evenly, and obtain solid powder A.

[0067] The cement is composed of white silicate cement and ultrafine silicate cement. The white silicate cement is of P•W52.5 grade, in which the C3S mineral content is not less than 70%; the ultrafine silicate cement is of P•Ⅰ52.5 grade, with a specific surface area of 650-7000m 2 / kg. The ratio of the two is 4.5:6.

[0068] The fine aggregate is basalt sand and corundum powder. The basalt sand particle size is continuously graded within four particle size ranges: 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh. The corundum powder is 200-300 mesh. The mass ratio of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh quartz sand to corundum powder is 1:4:2:2:1.

[0069] The mineral admixture is a mixture of ultrafine fly ash, silica fume, and mineral powder. The fly ash is microbeads with a D50 of 1-3 μm, the mineral powder is S140 ultrafine mineral powder with a D50 of 3-5 μm, and the silica fume has a D50 of 1-2 μm. The mass ratio of the mixture of ultrafine fly ash, silica fume, and mineral powder is 3:1:6.

[0070] S2. Mix the powdered water reducer, retarder, early strength agent, composite expansion agent and defoamer, stir evenly to obtain solid powder B.

[0071] Among them, the early strength agent is a mixture of high-activity inorganic minerals mainly composed of calcium aluminate and calcium silicate and gypsum in a mass ratio of 7:3. The preparation process of the high-activity inorganic mineral is as follows: CaO, Al2O3 and SiO2 are uniformly mixed in a mass ratio of 1:0.6:0.2, pressed into sheets, calcined at 2000-2100℃ to liquid phase, kept warm for 15 minutes, and rapidly cooled by water flow. The obtained solid powder is ground into powder. Gypsum is anhydrite. After the two are mixed in a fixed ratio, the mixture is modified by ultrafine grinding with a jet mill to obtain a specific surface area of 950cm 2 / g.

[0072] 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 the mass ratio of the plastic expansion agent and the mineral expansion agent being 1.5:100. More preferably, the plastic expansion agent is azodicarbonamide and the mineral expansion agent is HP-CSA expansion agent.

[0073] The early-strength powder water reducer is selected from the high-performance polycarboxylic acid early-strength powder water reducer of China Building Materials Zhongyan Technology.

[0074] The defoaming agent is a silicone defoaming agent.

[0075] S3. Mix solid powder A and solid powder B, stir evenly to obtain powder mixture C, then add water to the powder mixture C at a water-to-material ratio of 0.08, stir for 3 minutes, until the mixture is uniform and free of lumps, then evenly add steel fiber according to the proportion, stir for 7 minutes, and obtain a grouting material.

[0076] In S3, the total mixing time of solid powder A, solid powder B and steel fiber is 10 minutes.

[0077] Furthermore, the prepared grouting material can be left to rest for 3 minutes to allow bubbles to escape, before being transported to a grouting machine for pumping. This allows for the application of the grouting material in ultra-high-performance offshore wind turbine jackets in low-temperature environments.

[0078] After testing, the initial fluidity of the grouting material is 320mm, the 1d compressive strength is 97.5MPa, the 3d compressive strength is 108.2MPa, the 28d compressive strength is 155.4MPa, the flexural strength is 20.7MPa, the tensile strength is 9.5MPa, the elastic ultimate tensile strength is 8.3MPa, and the elastic modulus is 48GPa.

[0079] Example 5: 25 parts of cement, 45 parts of fine aggregate, 10 parts of early strength agent, 15 parts of ultrafine mineral admixture, 1 part of expansive agent, 0.01 part of early strength powder water reducer, 1 part of defoaming agent, 0.01 part of retarder, and 0.1 part of steel fiber.

[0080] The steel fiber is a straight copper-plated steel fiber with a length of 2.5 mm and a diameter of 0.1 mm.

[0081] This application also provides a method for preparing the grouting material, such as Figure 1 Shown, including: S1. Mix cement, active admixture and fine aggregate, stir evenly, and obtain solid powder A.

[0082] The cement is composed of white silicate cement and ultrafine silicate cement. The white silicate cement is of P•W52.5 grade, in which the C3S mineral content is not less than 70%; the ultrafine silicate cement is of P•Ⅰ52.5 grade, with a specific surface area of 650-7000m 2 / kg. The ratio of the two is 5:5.

[0083] The fine aggregate is basalt sand and corundum powder. The basalt sand particle size is continuously graded within four particle size ranges: 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh. The corundum powder is 200-300 mesh. The mass ratio of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh quartz sand to corundum powder is 1:4:2:2:1.

[0084] The mineral admixture is a mixture of ultrafine fly ash, silica fume, and mineral powder. The fly ash is microbeads with a D50 of 1-3 μm, the mineral powder is S140 ultrafine mineral powder with a D50 of 3-5 μm, and the silica fume has a D50 of 1-2 μm. The mass ratio of the mixture of ultrafine fly ash, silica fume, and mineral powder is 3:1:6.

[0085] S2. Mix the powdered water reducer, retarder, early strength agent, composite expansion agent and defoamer, stir evenly to obtain solid powder B.

[0086] Among them, the early strength agent is a mixture of high-activity inorganic minerals mainly composed of calcium aluminate and calcium silicate and gypsum in a mass ratio of 7:3. The preparation process of the high-activity inorganic mineral is as follows: CaO, Al2O3 and SiO2 are uniformly mixed in a mass ratio of 1:0.6:0.2, pressed into sheets, calcined at 2000-2100℃ to liquid phase, kept warm for 15 minutes, and rapidly cooled by water flow. The obtained solid powder is ground into powder. Gypsum is anhydrite. After the two are mixed in a fixed ratio, the mixture is modified by ultrafine grinding with a jet mill to obtain a specific surface area of 950cm 2 / g.

[0087] 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 the mass ratio of the plastic expansion agent and the mineral expansion agent being 2:100. More preferably, the plastic expansion agent is azodicarbonamide and the mineral expansion agent is HP-CSA expansion agent.

[0088] The early-strength powder water reducer is selected from the high-performance polycarboxylic acid early-strength powder water reducer of China Building Materials Zhongyan Technology.

[0089] The defoaming agent is a silicone defoaming agent.

[0090] S3. Mix solid powder A and solid powder B, stir evenly to obtain powder mixture C, then add water to the powder mixture C at a water-to-material ratio of 0.10, stir for 5 minutes, until the mixture is uniform and free of lumps, then evenly add steel fiber according to the proportion, stir for 10 minutes, and obtain a grouting material.

[0091] In S3, the total mixing time of solid powder A, solid powder B and steel fiber is 15 minutes.

[0092] Furthermore, the prepared grouting material can be left to rest to allow bubbles to escape, and then transported to a grouting machine for pumping, enabling the application of the grouting material in ultra-high-performance offshore wind turbine jackets in low-temperature environments. The resting time is 1-3 minutes.

[0093] After testing, the initial fluidity of the grouting material is 310mm, the 1d compressive strength is 110.5MPa, the 3d compressive strength is 123.4MPa, the 28d compressive strength is 150.3MPa, the flexural strength is 20.9MPa, the tensile strength is 9.0.0MPa, the elastic ultimate tensile strength is 8.5MPa, and the elastic modulus is 50GPa.

[0094] Comparative Example 1: This application also provides a method for preparing the grouting material, such as Figure 1 Shown, including: S1. Mix cement, active admixture and fine aggregate, stir evenly, and obtain solid powder A.

[0095] The cement is composed of white silicate cement and ultrafine silicate cement. The white silicate cement is of P•W52.5 grade, in which the C3S mineral content is not less than 70%; the ultrafine silicate cement is of P•Ⅰ52.5 grade, with a specific surface area of 650-7000m 2 / kg. The ratio of the two is 6.5:3.5.

[0096] The fine aggregate is basalt sand and corundum powder. The basalt sand particle size is continuously graded within four particle size ranges: 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh. The corundum powder is 200-300 mesh. The mass ratio of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh quartz sand to corundum powder is 1:4:3:1:1.

[0097] The mineral admixture is a mixture of ultrafine fly ash, silica fume, and mineral powder. The fly ash is microbeads with a D50 of 1-3 μm, the mineral powder is S140 ultrafine mineral powder with a D50 of 3-5 μm, and the silica fume has a D50 of 1-2 μm. The mass ratio of the mixture of ultrafine fly ash, silica fume, and mineral powder is 3:1:6.

[0098] S2. Mix the powdered water reducer, retarder, early strength agent, composite expansion agent and defoamer, stir evenly to obtain solid powder B.

[0099] Among them, the early strength agent is a mixture of high-activity inorganic minerals mainly composed of calcium aluminate and calcium silicate and gypsum in a mass ratio of 6.5:3.5. The preparation process of the high-activity inorganic mineral is as follows: CaO, Al2O3 and SiO2 are uniformly mixed in a mass ratio of 1:0.6:0.2, pressed into sheets, calcined at 2000-2100℃ to liquid phase, kept warm for 15 minutes, and rapidly cooled by water flow. The obtained solid powder is ground into powder. Gypsum is anhydrite. After the two are mixed in a fixed ratio, the mixture is modified by ultrafine grinding with a jet mill to obtain a mixture with a specific surface area of 1000cm 2 / g.

[0100] 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 the mass ratio of the two being 1:100. More preferably, the plastic expansion agent is azodicarbonamide and the mineral expansion agent is HP-CSA expansion agent.

[0101] The early-strength powder water reducer is selected from the high-performance polycarboxylic acid early-strength powder water reducer of China Building Materials Zhongyan Technology.

[0102] The defoaming agent is a silicone defoaming agent.

[0103] S3. Mix solid powder A and solid powder B, stir evenly to obtain powder mixture C, then add water to the powder mixture C at a water-to-material ratio of 0.085, stir for 5 minutes, until the mixture is uniform and free of lumps, then evenly add steel fiber according to the proportion, stir for 10 minutes, and obtain a grouting material.

[0104] In S3, the total mixing time of solid powder A, solid powder B and steel fiber is 15 minutes.

[0105] Furthermore, the prepared grouting material can be left to rest for 3 minutes to allow bubbles to escape, before being transported to a grouting machine for pumping. This allows for the application of the grouting material in ultra-high-performance offshore wind turbine jackets in low-temperature environments.

[0106] After testing, the initial fluidity of the grouting material is 370mm, the 1d compressive strength is 86.5MPa, the 3d compressive strength is 100.2MPa, the 28d compressive strength is 132.4MPa, the flexural strength is 14.8MPa, the tensile strength is 7.5MPa, the elastic ultimate tensile strength is 6.0MPa, and the elastic modulus is 37GPa.

[0107] Comparative Example 2: A grouting material for ultra-high performance offshore wind power pipe frames in low temperature environments, comprising the following raw materials in parts by weight: 35 parts of cement, 30 parts of fine aggregate, 5 parts of early strength agent, 10 parts of ultrafine mineral admixture, 0.2 parts of composite expansive agent, 0.5 parts of early strength powder water reducer, 0.1 parts of defoaming agent, and 0.15 parts of retarder.

[0108] This application also provides a method for preparing the grouting material, such as Figure 1 Shown, including: S1. Mix cement, active admixture and fine aggregate, stir evenly, and obtain solid powder A.

[0109] The cement is composed of white silicate cement and ultrafine silicate cement. The white silicate cement is of P•W52.5 grade, in which the C3S mineral content is not less than 70%; the ultrafine silicate cement is of P•Ⅰ52.5 grade, with a specific surface area of 650-7000m 2 / kg. The ratio of the two is 5:5.

[0110] The fine aggregate is basalt sand and corundum powder. The basalt sand particle size is continuously graded within four particle size ranges: 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh. The corundum powder is 200-300 mesh. The mass ratio of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh quartz sand to corundum powder is 1:4:2:2:1.

[0111] The mineral admixture is a mixture of ultrafine fly ash, silica fume, and mineral powder. The fly ash is microbeads with a D50 of 1-3 μm, the mineral powder is S140 ultrafine mineral powder with a D50 of 3-5 μm, and the silica fume has a D50 of 1-2 μm. The mass ratio of the mixture of ultrafine fly ash, silica fume, and mineral powder is 3:1:6.

[0112] S2. Mix the powdered water reducer, retarder, early strength agent, composite expansion agent and defoamer, stir evenly to obtain solid powder B.

[0113] Among them, the early strength agent is a mixture of high-activity inorganic minerals mainly composed of calcium aluminate and calcium silicate and gypsum in a mass ratio of 7:3. The preparation process of the high-activity inorganic mineral is as follows: CaO, Al2O3 and SiO2 are uniformly mixed in a mass ratio of 1:0.6:0.2, pressed into sheets, calcined at 2000-2100℃ to liquid phase, kept warm for 15 minutes, and rapidly cooled by water flow. The obtained solid powder is ground into powder. Gypsum is anhydrite. After the two are mixed in a fixed ratio, the mixture is modified by ultrafine grinding with a jet mill to obtain a specific surface area of 950cm 2 / g.

[0114] 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 the mass ratio of the plastic expansion agent and the mineral expansion agent being 1.5:100. More preferably, the plastic expansion agent is azodicarbonamide and the mineral expansion agent is HP-CSA expansion agent.

[0115] The early-strength powder water reducer is selected from the high-performance polycarboxylic acid early-strength powder water reducer of China Building Materials Zhongyan Technology.

[0116] The defoaming agent is a silicone defoaming agent.

[0117] S3. Mix solid powder A and solid powder B, stir evenly to obtain powder mixture C, then add water to the powder mixture C at a water-to-material ratio of 0.085, stir for 5 minutes, until the mixture is uniform and free of lumps, then add steel fiber evenly according to the proportion, stir for 10 minutes, and obtain the grouting material.

[0118] In S3, the total mixing time of solid powder A, solid powder B and steel fiber is 15 minutes.

[0119] Furthermore, the prepared grouting material can be left to rest to allow bubbles to escape, and then transported to a grouting machine for pumping, enabling the application of the grouting material in ultra-high-performance offshore wind turbine jackets in low-temperature environments. The resting time is 1-3 minutes.

[0120] After testing, the initial fluidity of the grouting material is 350mm, the 1d compressive strength is 98.0MPa, the 3d compressive strength is 111.5MPa, the 28d compressive strength is 156.7MPa, the flexural strength is 22.0MPa, the tensile strength is 7.5MPa, the elastic ultimate tensile strength is 6.5MPa, and the elastic modulus is 50GPa.

[0121] In Comparative Examples 1 and 2, where no steel fiber was added to the material components, the final mixtures exhibited lower mechanical properties, including compressive strength, tensile strength, ultimate tensile strength, and elastic modulus, than the samples containing steel fiber. In Example 2, where 5% by mass of steel fiber was added, the 28-day compressive strength was 167.4 MPa, the flexural strength was 24.7 MPa, the tensile strength was 11.0 MPa, the ultimate tensile strength was 9.5 MPa, and the elastic modulus was 55 GPa. This ratio resulted in the best mechanical properties for the grouting material, demonstrating the excellent bonding between the steel fiber and the mortar under low-temperature conditions and significantly improving the performance of the hardened product.

Claims

1. Ultra-high performance grouting material for offshore wind power pipe frame in low temperature environment, characterized by: It is composed of the following raw materials in parts by weight: 25-40 parts of cement, 32-45 parts of fine aggregate, 1-10 parts of early strength agent, 5-15 parts of ultrafine mineral admixture, 0.1-1 parts of expansion agent, 0.01-0.5 parts of early strength powder water reducer, 0.1-1 parts of defoaming agent, 0.01-0.15 parts of retarder, and 0.1-5 parts of steel fiber.

2. The ultra-high performance grouting material for offshore wind power pipe frames in low temperature environments according to claim 1, characterized in that: The cement consists of white silicate cement and ultrafine silicate cement, and the mass ratio of the white silicate cement to the ultrafine silicate cement is (4.5-7): (3.5-6).

3. The ultra-high performance grouting material for offshore wind power pipe frames in low temperature environments according to claim 2, characterized in that: The fine aggregate includes basalt sand and corundum powder; the particle size of the basalt sand is continuously graded within four particle size ranges 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).

4. The ultra-high performance grouting material for offshore wind power pipe frames in low temperature environments according to claim 3, characterized in that: 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 include calcium aluminate and calcium silicate.

5. The ultra-high performance grouting material for offshore wind power pipe frames in low temperature environments according to claim 4, characterized in that: The ultrafine mineral admixture is a mixture of ultrafine fly ash, silica fume and mineral powder, and the mass ratio of the ultrafine fly ash, silica fume and mineral powder is (3-4):(1-2):(6-7).

6. The ultra-high performance grouting material for offshore wind power pipe frames in low temperature environments according to claim 5, characterized in that: The expansion agent is at least one of a plastic expansion agent and a mineral expansion agent; when the expansion agent is a composite of a plastic expansion agent and a mineral expansion agent, the mass ratio of the plastic expansion agent to the mineral expansion agent is 1-2:100; the plastic expansion agent is azodicarbonamide, and the mineral expansion agent is HP-CSA expansion agent.

7. The ultra-high performance grouting material for offshore wind power pipe frames in low temperature environments according to claim 6, characterized in that: The early-strength powder water-reducing agent is a polycarboxylic acid early-strength powder water-reducing agent; the defoaming agent is a silicone defoaming agent; and 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.

8. A method for preparing a grouting material according to any one of claims 1 to 7, characterized in that: include: S1. Mix cement, active admixture and fine aggregate, stir evenly to obtain solid powder A; S2, mixing the powdered water reducer, retarder, early strength agent, composite expansion agent and defoamer, stirring 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 the 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 evenly add steel fiber according to the proportion, stir for 8 to 10 minutes, and obtain a grouting material.

9. The method for preparing the grouting material according to claim 8, wherein: In S3, the total mixing time of solid powder A, solid powder B and steel fiber is 10-15 minutes.

10. Use of the grouting material according to any one of claims 1 to 7 in an ultra-high performance offshore wind power conductor frame in a low temperature environment.

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