Ultra-high-performance grouting material for offshore wind power jacket as well as preparation method and application of grouting material

Abstract

The invention relates to the technical field of cement-based building materials, in particular to an ultra-high-performance grouting material for an offshore wind power jacket and a preparation method and application of the grouting material. Cement, fine aggregate, corundum micro powder, a superfine mineral admixture, a reinforcing agent, a reinforcing accelerant, an expanding agent, a water reducing agent, a defoaming agent and steel fibers are adopted as raw materials; the grouting material for the offshore wind power jacket, which is high in compressive strength and good in tensile strength and ultimate elastic tensile strength, is prepared by utilizing the compatibility of the superfine mineral admixture, the reinforcing agent and the reinforcing accelerant and cooperating with the steel fibers.

Description

Technical Field

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

[0002] As the demand for green energy grows, wind energy has attracted much attention due to its sustainability, and offshore wind power construction has been vigorously carried out in recent years. The offshore environment is complex, and the construction of wind turbine foundations is becoming increasingly difficult.

[0003] Offshore wind turbines are developing towards large-scale and deep sea space. At present, offshore wind power is mainly based on the structure of the jacket foundation. The reliability of the grouting connection section determines the safety and reliability of the entire wind turbine foundation. The grouting material for offshore wind power jackets needs to have high flow, ultra-high strength, high elastic modulus, fatigue resistance and high durability, especially in terms of compressive strength and uniaxial tensile strength.

[0004] At present, foreign products represented by BASF 9500 account for a large proportion in offshore wind power. Domestic companies such as China National Building Materials Zhongyan Technology (CN116693262A, CN118307272 A), China Communications Third Engineering Bureau (CN104003681A), and Subot (CN113968698A) have the development and production capabilities and have applied for patents. At present, under the conditions of similar water-to-material ratio, the products of the above-mentioned companies have the best compressive strength between 120-160MPa, and there is very little structural verification data involved, such as tensile strength, elastic limit tensile strength and other structural performance data that play an important role in the stability of large-scale offshore wind turbines. These data play an important supporting role in the development of large-scale, deep-sea jacket foundations. Steel fiber is a commonly used toughening fiber, but it is difficult to disperse in cement-based materials and is easy to settle. How to use grouting materials in offshore wind power jackets is relatively blank. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides an ultra-high performance grouting material for offshore wind power conduit frames. Specifically, the present invention adopts cement, fine aggregate, corundum powder, ultra-fine mineral admixtures, reinforcing agents, reinforcing promoters, expanders, water reducers, defoaming agents, and steel fibers as raw materials, and utilizes the compatibility of ultra-fine mineral admixtures, reinforcing agents, and reinforcing promoters in conjunction with steel fibers to prepare a grouting material for offshore wind power conduit frames with high compressive strength, tensile strength, and good elastic limit tensile strength performance.

[0006] Specifically, the ultra-high performance grouting material for offshore wind power conduit frames of the present invention is composed of the following raw materials in parts by weight: 20-30 parts of cement, 30-45 parts of fine aggregate, 1-10 parts of corundum powder, 5-15 parts of ultrafine mineral admixture, 1-10 parts of reinforcing agent, 0.1-2 parts of reinforcing accelerator, 0.1-1 parts of expansion agent, 0.1-0.3 parts of water reducer, 0.01-0.1 parts of defoaming agent, and 0.1-5 parts of steel fiber.

[0007] Preferably, the cement is P•W52.5 cement, wherein C 3 S mineral content ≥ 70%. In order to meet the performance requirements, the present invention preferably uses white silicate cement, whose C 3 The S mineral content is higher than that of ordinary Portland cement, and it has better use effect.

[0008] Preferably, the fine aggregate is at least one of basalt sand and quartz sand.

[0009] Preferably, the fine aggregate particle size is continuously graded within four particle size ranges of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh.

[0010] Preferably, the particle size of the corundum powder is 200-300 mesh.

[0011] Preferably, the ultrafine mineral admixture is a mixture of metakaolin, rice husk ash, tuff, and mineral powder in a mass ratio of (1.0-3.2):(0.4-1.5):(1.7-3.1):(2.2-5.5), and a grinding aid is added to grind the mixture. More preferably, the grinding aid is a mixture of triisopropanolamine, polyethylene glycol, and diethanolisopropanolamine in a mass ratio of (0.1-0.2):(0.2-0.3):(0.1-0.2).

[0012] Ultrafine mineral admixtures have good volcanic ash effect and can have a direct impact on the workability of grouting materials. The present invention adds fine aggregate and corundum powder as aggregate and filler, and adds steel fiber as a toughening material. In order to ensure the homogeneity of steel fiber and the workability of slurry, the present invention adopts metakaolin, rice husk ash, tuff and mineral powder as ultrafine mineral admixture varieties. Metakaolin and rice husk ash have high activity, mineral powder can supplement the later strength, metakaolin and tuff can promote the dispersion of steel fiber in the slurry, and ultrafine admixtures combined with fine aggregate, corundum powder and steel fiber can improve the construction effect and mechanical properties of grouting materials.

[0013] Preferably, the reinforcing agent preparation process is to add CaO, Al 2 O 3 and SiO 2After uniformly mixing in a mass ratio of 1:(0.5-0.8):(0.1-0.2), pressing into sheets, calcining to liquid phase, heat preservation, rapid cooling, grinding to obtain powder, mixing the powder with gypsum in a mass ratio of (6.5-7):(3-4), and ultrafine grinding to obtain. More preferably, the calcination temperature is 2000-2100°C, the heat preservation time is 10-20min, rapid cooling is performed by water flow rapid cooling, gypsum is selected from anhydrite, and ultrafine grinding is performed by using an air flow mill to ultrafinely grind to a specific surface area of ​​900-1000cm 2 / g.

[0014] Preferably, the reinforcing accelerator is composed of CSH crystal nuclei, calcium sulfate nano whiskers and triethanolamine in a mass ratio of (0.5-5):(0.01-1):1.

[0015] The reinforcing agent of the present invention has high activity, and the reinforcing accelerator can further promote the hydration of the reinforcing agent. However, the accelerated hydration rate in the early stage is also easy to form tiny pores between the hydration products, resulting in the shrinkage of the strength of the grouting material in the later stage. The addition of calcium sulfate whiskers in the reinforcing accelerator can fill the pores of the hydration products, especially the overlapping of the needle-shaped ettringite. The small-sized CSH crystal nuclei can promote the dispersion of calcium sulfate nano whiskers. Triethanolamine promotes the CSH crystal nuclei and calcium sulfate nano whiskers to form nucleation sites, thereby improving the strength of CSH in white cement. 3 S mineral hydration degree, thereby promoting the early strength development and later strength supplement of the grouting material.

[0016] Preferably, 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, and the mass ratio of the two is (1-2): 100. More preferably, the plastic expansion agent is azodicarbonamide, and the mineral expansion agent is HP-CSA expansion agent.

[0017] Preferably, the defoamer is at least one of an organosilicon defoamer and a fatty acid defoamer. More preferably, the defoamer is a mixture of an organosilicon defoamer and a fatty acid defoamer in a mass ratio of 3.5-6.5.

[0018] Preferably, the water reducer is a polycarboxylate water reducer. More preferably, the water reducer is an early strength polycarboxylate water reducer.

[0019] Preferably, the steel fiber is a straight copper-plated steel fiber with a length of 3 mm and a diameter of 0.2-0.2 mm.

[0020] The present invention also relates to a method for preparing the ultra-high performance offshore wind power conduit grouting material, which specifically comprises the following steps: 1) Weigh each raw material by weight, 2) Mix all the raw materials evenly.

[0021] The present invention also relates to the application of the above grouting material in the construction of offshore wind power conductor frames. More preferably, the present invention relates to the application of the above grouting material in the construction of large-scale offshore wind power units and deep sea conductor frame foundations.

[0022] Preferably, the application is to directly mix the grouting material and water evenly, and more preferably, the water-to-material ratio during the application process is (0.08-0.09):1.

[0023] The present invention has the following technical advantages: 1. The present invention improves the activity of cementitious materials, improves the workability of slurry, and promotes uniform dispersion of steel fibers by combining ultrafine mineral admixtures, reinforcing agents, reinforcing accelerators and cement. 2. The reinforcing accelerator of the present invention promotes the reinforcing agent and cooperates with the steel fiber to improve the anti-cracking performance of the grouting material. 3. The grouting material of the present invention has excellent mechanical properties and only needs to be mixed with water during application, so it is easy to use. DETAILED DESCRIPTION

[0024] In order to characterize the technical effect of the present invention, a grouting material was prepared and its initial fluidity, hardened compressive strength, tensile strength and elastic ultimate tensile strength were tested. During the test, P•W52.5 cement was selected as cement, the fine aggregate particle size consisted of continuously graded quartz sand within four particle size ranges of 10-20 mesh, 20-40 mesh, 40-70 mesh and 70-120 mesh, the corundum micropowder particle size was 200-300 mesh, the expansion agent was a composite of azodicarbonamide and HP-CSA expansion agent in a mass ratio of 1:100, the defoamer was an organosilicon defoamer, the water reducer was an early-strength polycarboxylic acid water reducer with a water reduction rate of 25%, the steel fiber was a straight copper-plated steel fiber with a length of 3 mm and a diameter of 0.2-0.2 mm, and the mass ratio of the grouting material to mixing water was 1:0.08.

[0025] Example 1 The grouting material is composed of the following raw materials in parts by weight: 30 parts of cement, 40 parts of fine aggregate, 10 parts of corundum powder, 12 parts of ultrafine mineral admixture, 8 parts of reinforcing agent, 1.5 parts of reinforcing accelerator, 0.8 parts of expansion agent, 0.3 parts of water reducer, 0.04 parts of defoamer, 2 parts of steel fiber, and the fine mineral admixture is kaolin, rice husk ash, tuff, and mineral powder mixed in a mass ratio of 3:1:2:5, and a grinding aid is added to grind to obtain. The preparation process of the enhancer is to mix CaO, Al 2 O 3 and SiO 2 After uniformly mixing at a mass ratio of 1:0.7:0.1, press into sheets, calcine at 2100℃ to liquid phase, keep warm for 15 minutes, quench, grind to obtain powder, mix the powder with gypsum at a mass ratio of 7:3, and grind to obtain ultrafine powder. The reinforcing accelerator is composed of CSH crystal nuclei, calcium sulfate nano whiskers and triethanolamine in a mass ratio of 3.5:0.5:1.

[0026] After testing, the initial fluidity of the slurry was 360mm, the 1d compressive strength was 102.5MPa, the 3d compressive strength was 115.5MPa, the 28d compressive strength was 165.8MPa, the 28d tensile strength was 11.2MPa, and the elastic ultimate tensile strength was 8.6MPa.

[0027] Example 2 The grouting material is composed of the following raw materials in parts by weight: 28 parts of cement, 40 parts of fine aggregate, 8 parts of corundum powder, 13 parts of ultrafine mineral admixture, 10 parts of reinforcing agent, 2 parts of reinforcing accelerator, 0.7 parts of expansion agent, 0.3 parts of water reducing agent, 0.05 parts of defoaming agent, 2.5 parts of steel fiber, and the fine mineral admixture is kaolin, rice husk ash, tuff, and mineral powder mixed in a mass ratio of 1.5:1.2:3:4, and a grinding aid is added to grind to obtain the grouting material. The preparation process of the enhancer is to mix CaO, Al 2 O 3 and SiO 2 After uniformly mixing at a mass ratio of 1:0.6:0.15, press into sheets, calcine at 2050℃ to liquid phase, keep warm for 15min, quench, grind to obtain powder, mix the powder with gypsum at a mass ratio of 7:3, and grind to obtain, The reinforcing accelerator is composed of CSH crystal nuclei, calcium sulfate nano whiskers and triethanolamine in a mass ratio of 4:0.6:1.

[0028] After testing, the initial fluidity of the slurry was 360mm, the 1d compressive strength was 105.6MPa, the 3d compressive strength was 118.3MPa, the 28d compressive strength was 172.6MPa, the 28d tensile strength was 11.7MPa, and the elastic ultimate tensile strength was 8.9MPa.

[0029] Comparative Example 1 The grouting material is composed of the following raw materials in parts by weight: 30 parts of cement, 40 parts of fine aggregate, 10 parts of corundum powder, 12 parts of ultrafine mineral admixture, 8 parts of reinforcing agent, 1.5 parts of reinforcing accelerator, 0.8 parts of expansion agent, 0.3 parts of water reducing agent, 0.04 parts of defoaming agent, The fine mineral admixture is fly ash, rice husk ash, silica ash and mineral powder mixed in a mass ratio of 3:1:2:5, and then added with a grinding aid to grind. The preparation process of the enhancer is to mix CaO, Al 2 O 3 and SiO 2After uniformly mixing at a mass ratio of 1:0.7:0.1, press into sheets, calcine at 2100℃ to liquid phase, keep warm for 15 minutes, quench, grind to obtain powder, mix the powder with gypsum at a mass ratio of 7:3, and grind to obtain ultrafine powder. The reinforcing accelerator is composed of CSH crystal nuclei, calcium sulfate nano whiskers and triethanolamine in a mass ratio of 3.5:0.5:1.

[0030] After testing, the initial fluidity of the slurry was 350mm, the 1d compressive strength was 95.1MPa, the 3d compressive strength was 103.4MPa, the 28d compressive strength was 146.2MPa, the 28d tensile strength was 5.7MPa, and the elastic ultimate tensile strength was 5.3MPa.

[0031] Comparative Example 2 The grouting material is composed of the following raw materials in parts by weight: 30 parts of cement, 40 parts of fine aggregate, 10 parts of corundum powder, 12 parts of ultrafine mineral admixture, 8 parts of reinforcing agent, 1.5 parts of reinforcing accelerator, 0.8 parts of expansion agent, 0.3 parts of water reducing agent, 0.04 parts of defoaming agent, 2 parts of steel fiber, The fine mineral admixture is fly ash, rice husk ash, silica ash, and mineral powder mixed evenly in a mass ratio of 3:1:2:5, and then added with a grinding aid to grind. The preparation process of the enhancer is to mix CaO, Al 2 O 3 and SiO 2 After uniformly mixing at a mass ratio of 1:0.7:0.1, press into sheets, calcine at 2100℃ to liquid phase, keep warm for 15 minutes, quench, grind to obtain powder, mix the powder with gypsum at a mass ratio of 7:3, and grind to obtain ultrafine powder. The reinforcing accelerator is composed of CSH crystal nuclei, calcium sulfate nano whiskers and triethanolamine in a mass ratio of 3.5:0.5:1.

[0032] After testing, the initial fluidity of the slurry was 300mm, the steel fibers sank to the bottom and agglomerated, the 1-day compressive strength was 92.1MPa, the 3-day compressive strength was 103.8MPa, the 28-day compressive strength was 137.3MPa, the 28-day tensile strength was 9.2MPa, and the elastic ultimate tensile strength was 7.1MPa.

[0033] Comparative Example 3 The grouting material is composed of the following raw materials in parts by weight: 30 parts of cement, 40 parts of fine aggregate, 10 parts of corundum powder, 12 parts of ultrafine mineral admixture, 8 parts of reinforcing agent, 1.5 parts of CSH crystal nucleus, 0.8 parts of expansion agent, 0.3 parts of water reducing agent, 0.04 parts of defoaming agent, 2 parts of steel fiber, The fine mineral admixture is metakaolin, rice husk ash, tuff, and mineral powder mixed evenly in a mass ratio of 3:1:2:5, and then ground with a grinding aid to obtain. The preparation process of the enhancer is to mix CaO, Al 2 O 3 and SiO 2 After uniformly mixing in a mass ratio of 1:0.7:0.1, press into sheets, calcine at 2100℃ to liquid phase, keep warm for 15 minutes, quench, grind to obtain powder, mix the powder with gypsum in a mass ratio of 7:3, and grind to obtain the product by ultrafine grinding.

[0034] After testing, the initial fluidity of the slurry was 320mm, the 1d compressive strength was 86.3MPa, the 3d compressive strength was 93.5MPa, the 28d compressive strength was 139.7MPa, the 28d tensile strength was 8.4MPa, and the elastic ultimate tensile strength was 7.7MPa.

[0035] Comparative Example 4 The grouting material is composed of the following raw materials in parts by weight: 30 parts of cement, 40 parts of fine aggregate, 10 parts of corundum powder, 12 parts of ultrafine mineral admixture, 8 parts of 42.5 grade sulphoaluminate cement, 1.5 parts of reinforcing accelerator, 0.8 parts of expansion agent, 0.3 parts of water reducing agent, 0.04 parts of defoaming agent, 2 parts of steel fiber, The fine mineral admixture is metakaolin, rice husk ash, tuff, and mineral powder mixed evenly in a mass ratio of 3:1:2:5, and then ground with a grinding aid to obtain. The reinforcing accelerator is composed of CSH crystal nuclei, calcium sulfate nano whiskers and triethanolamine in a mass ratio of 3.5:0.5:1.

[0036] After testing, the initial fluidity of the slurry was 300mm, the 1d compressive strength was 80.8MPa, the 3d compressive strength was 89.6MPa, the 28d compressive strength was 121.9MPa, the 28d tensile strength was 8.1MPa, and the elastic ultimate tensile strength was 7.3MPa.

[0037] Comparative Example 5 The grouting material is composed of the following raw materials in parts by weight: 30 parts of cement, 40 parts of fine aggregate, 10 parts of corundum powder, 12 parts of ultrafine mineral admixture, 8 parts of reinforcing agent, 1.5 parts of reinforcing accelerator, 0.8 parts of expansion agent, 0.3 parts of water reducing agent, 0.04 parts of defoaming agent, 2 parts of polyvinyl alcohol fiber, The fine mineral admixture is metakaolin, rice husk ash, fly ash and mineral powder mixed evenly in a mass ratio of 3:1:2:5, and then added with a grinding aid to grind. The preparation process of the enhancer is to mix CaO, Al 2 O 3 and SiO 2After uniformly mixing at a mass ratio of 1:0.7:0.1, press into sheets, calcine at 2100℃ to liquid phase, keep warm for 15 minutes, quench, grind to obtain powder, mix the powder with gypsum at a mass ratio of 7:3, and grind to obtain ultrafine powder. The reinforcing accelerator is composed of CSH crystal nuclei, nanocellulose and triethanolamine in a mass ratio of 3.5:0.5:1.

[0038] After testing, the initial fluidity of the slurry was 340mm, the 1d compressive strength was 78.2MPa, the 3d compressive strength was 85.7MPa, the 28d compressive strength was 126.0MPa, the 28d tensile strength was 7.5MPa, and the elastic ultimate tensile strength was 6.9MPa.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A grouting material for ultra-high performance offshore wind power pipe frame, characterized in that: The invention is composed of the following raw materials in parts by weight: 20-30 parts of cement, 30-45 parts of fine aggregate, 1-10 parts of corundum powder, 5-15 parts of ultrafine mineral admixture, 1-10 parts of reinforcing agent, 0.1-2 parts of reinforcing accelerator, 0.1-1 parts of expansion agent, 0.1-0.3 parts of water reducing agent, 0.01-0.1 parts of defoaming agent and 0.1-5 parts of steel fiber.

2. The ultra-high performance offshore wind power conduit grouting material according to claim 1 is characterized in that: The cement is P·W52.5 cement, wherein the C3S mineral content is ≥70%.

3. The ultra-high performance offshore wind power conduit grouting material according to claim 1, characterized in that: The fine aggregate is at least one of basalt sand and quartz sand.

4. The ultra-high performance grouting material for offshore wind power conduit according to claim 1, characterized in that: The particle size of the fine aggregate is continuously graded within four particle size ranges of 10-20 mesh, 20-40 mesh, 40-70 mesh, and 70-120 mesh.

5. The ultra-high performance grouting material for offshore wind power conduit according to claim 1, characterized in that: The particle size of the corundum micropowder is 200-300 meshes.

6. The ultra-high performance grouting material for offshore wind power conduit according to claim 1, characterized in that: The ultrafine mineral admixture is prepared by mixing metakaolin, rice husk ash, tuff and mineral powder in a mass ratio of (1.0-3.2):(0.4-1.5):(1.7-3.1):(2.2-5.5), adding a grinding aid and grinding.

7. The ultra-high performance grouting material for offshore wind power conduit according to claim 1, characterized in that: The preparation process of the reinforcing agent comprises the following steps: uniformly mixing CaO, Al2O3 and SiO2 in a mass ratio of 1:(0.5-0.8):(0.1-0.2), pressing into sheets, calcining to a liquid phase, keeping the temperature, rapidly cooling, grinding to obtain a powder, mixing the powder with gypsum in a mass ratio of (6.5-7):(3-4), and ultrafine grinding to obtain the reinforcing agent.

8. The ultra-high performance grouting material for offshore wind power conduit according to claim 1, characterized in that: The reinforcing accelerator is composed of CSH crystal nuclei, calcium sulfate nano whiskers and triethanolamine in a mass ratio of (0.5-5):(0.01-1):

1.

9. The method for preparing the ultra-high performance grouting material for offshore wind power conduit according to any one of claims 1 to 8, characterized in that: The steps include: 1) Weigh each raw material by weight, 2) Mix all the raw materials evenly.

10. Use of the grouting material according to any one of claims 1 to 8 in the construction of offshore wind power conductor towers.