An ultra-high performance offshore wind power grouting material, a preparation method and application thereof

Abstract

The application discloses an ultra-high performance offshore wind power grouting material and a preparation method and application thereof. According to weight parts, the ultra-high performance offshore wind power grouting material comprises the following components: cement 600-800 parts, viscosity reducer 100-200 parts, silica fume 75-150 parts, ground zeolite powder 75-150 parts, water reducing agent 6-8 parts, defoaming agent 1-2 parts, plastic expansion agent 0.1-0.5 parts, anti-cracking agent 50-80 parts, carborundum 700-900 parts and water 155-170 parts; the cement is 52.5-grade white portland cement; the viscosity reducer is composed of microbeads, limestone powder, ultra-fine mineral powder and metakaolin, wherein the microbeads account for 30wt%-50wt%, the limestone powder accounts for 15wt%-35wt%, the ultra-fine mineral powder accounts for 20wt%-30wt% and the metakaolin accounts for 5wt%-15wt%; the plastic expansion agent is composed of an azo compound plastic expansion agent and a nitroso compound plastic expansion agent with a weight ratio of (0.5-2):1. The ultra-high performance offshore wind power grouting material has high early strength, good fluidity, excellent durability and micro-expansion characteristics, and has the advantages of simple preparation process and low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building materials, in particular to an ultra-high performance offshore wind power grouting material and a preparation method and application thereof. BACKGROUND

[0002] The offshore wind power grouting material is a key material connecting the offshore wind turbine support structure and the pile foundation, and its application environment is harsh, so the performance requirements are extremely high. It not only requires good working performance (good fluidity, appropriate viscosity), excellent mechanical properties (28d compressive strength requirement reaches 130MPa or more) and durability, slight expansion, but also good fatigue resistance.

[0003] Existing grouting material products rarely consider the application in the marine field, and their performance indicators cannot meet the technical requirements of offshore wind power grouting material, which is not conducive to the healthy development of the offshore wind power industry. Therefore, an ultra-high performance offshore wind power grouting material is urgently needed.

[0004] The patent document with publication number CN116409966A and publication date July 11, 2023 discloses a micro-expansion high-strength offshore wind power grouting material. The offshore wind power grouting material uses conventional P.Ⅱ52.5 Portland cement and quartz sand, and requires a large amount of fresh water. The preparation process of the plastic expansion agent and the micro-nano powder is complex, which leads to high cost. More importantly, the offshore wind power grouting material uses calcium sulphoaluminate expansion agent, which can maintain a micro-expansion state for 28 days, but still cannot avoid the problem of large shrinkage in the middle and later stages.

[0005] The patent document with publication number CN116573875A and publication date August 11, 2023 discloses an offshore wind power high-strength grouting material prepared by using modified nano-silicon dioxide. The steel fiber used in the offshore wind power grouting material is prone to corrosion in the marine environment. The offshore wind power grouting material uses ordinary Portland cement and sulphoaluminate cement, which requires a large amount of water and has large shrinkage in the later stage. The preparation process of the modified nano-silicon dioxide is complex, the cost is high, and the fluidity of the grouting material is greatly affected. SUMMARY

[0006] To solve the above technical problems, the present application provides an ultra-high performance offshore wind power grouting material and a preparation method and application thereof. The ultra-high performance offshore wind power grouting material uses common raw materials on the market, has a simple preparation process, low cost, good fluidity, excellent durability, high early strength, and small shrinkage in the middle and later stages.

[0007] The technical scheme provided by the present application is as follows:

[0008] In a first aspect, the present application provides an ultra-high performance offshore wind power grouting material, which comprises, in terms of parts by weight, 600-800 parts of cement, 100-200 parts of viscosity reducer, 75-150 parts of silica fume, 75-150 parts of finely ground zeolite powder, 6-8 parts of water reducing agent, 1-2 parts of defoaming agent, 0.1-0.5 parts of plastic expansion agent, 50-80 parts of anti-cracking agent, 700-900 parts of carborundum, and 155-170 parts of water.

[0009] The cement is 52.5-grade white portland cement.

[0010] The viscosity reducer is composed of microbeads, limestone powder, ultra-fine mineral powder and metakaolin, wherein the microbeads account for 30wt%-50wt%, the limestone powder accounts for 15wt%-35wt%, the ultra-fine mineral powder accounts for 20wt%-30wt%, and the metakaolin accounts for 5wt%-15wt%.

[0011] The plastic expansion agent is composed of azo compound plastic expansion agent and nitroso compound plastic expansion agent in a weight ratio of (0.5-2):1.

[0012] In combination with the first aspect of the present application, in some embodiments, the water-to-material ratio of the ultra-high performance offshore wind power grouting material is 0.08-0.09.

[0013] In combination with the first aspect of the present application, in some embodiments, the azo compound plastic expansion agent is azobisdimethylamide; and / or, the nitroso compound plastic expansion agent is diazidopentamethylenetetramine.

[0014] In combination with the first aspect of the present application, in some embodiments, the silica fume has a SiO2 content of ≥94% and a specific surface area of ≥15000m 2 / kg.

[0015] In combination with the first aspect of the present application, in some embodiments, the water reducing agent is a powder polycarboxylic acid high-performance water reducing agent with a water-reducing rate of ≥35%; and the defoaming agent is an organic silicon-based powder defoaming agent.

[0016] In combination with the first aspect of the present application, in some embodiments, the anti-cracking agent is a type I calcium-magnesium composite expansion agent, wherein the content of magnesium oxide is 40wt%.

[0017] In combination with the first aspect of the present application, in some embodiments, the carborundum meets the closest packing model.

[0018] In combination with the first aspect of the present application, in some embodiments, the carborundum is composed of 8-16 mesh carborundum, 20-40 mesh carborundum and 40-70 mesh carborundum in a weight ratio of 4:2:3.

[0019] In a second aspect, the present application provides a preparation method of the super high performance offshore wind power grouting material, comprising the following steps:

[0020] Preparation: cement 600-800 parts, viscosity reducer 100-200 parts, silica fume 75-150 parts, fine zeolite powder 75-150 parts, water reducing agent 6-8 parts, defoaming agent 1-2 parts, plastic expansion agent 0.1-0.5 parts, anti-cracking agent 50-80 parts, carborundum 700-900 parts, and water 155-170 parts, according to the weight fraction; the cement is 52.5 grade white Portland cement; the viscosity reducer is composed of microbeads, limestone powder, ultra-fine mineral powder and metakaolin, wherein the microbeads account for 30wt%-50wt%, the limestone powder accounts for 15wt%-35wt%, the ultra-fine mineral powder accounts for 20wt%-30wt%, and the metakaolin accounts for 5wt%-15wt%; the plastic expansion agent is composed of azo compound plastic expansion agent and nitroso compound plastic expansion agent with a weight ratio of (0.5-2):1.

[0021] Mixing the cement, the viscosity reducer, the silica fume, the fine zeolite powder, the water reducing agent, the defoaming agent, the plastic expansion agent, the anti-cracking agent and the carborundum uniformly to obtain the dry mixture of the super high performance offshore wind power grouting material;

[0022] Adding water into the stirring pot and then adding the dry mixture of the super high performance offshore wind power grouting material to mix uniformly, thereby obtaining the super high performance offshore wind power grouting material.

[0023] In a third aspect, the present application provides the application of the super high performance offshore wind power grouting material in offshore wind power engineering.

[0024] Compared with the prior art, the present application has at least the following beneficial effects:

[0025] (1) The super high performance offshore wind power grouting material provided by the present application has good working performance: the initial fluidity of the grouting material is greater than or equal to 300mm, the 30min fluidity is greater than or equal to 270mm, the 60min fluidity is greater than or equal to 240mm, the initial setting time is 4h-8h, the viscosity is appropriate, the grouting material is easy to pump, the fluidity loss over time is small, and the construction time is long.

[0026] (2) The super high performance offshore wind power grouting material provided by the present application has excellent mechanical properties after setting: the 1d compressive strength is greater than or equal to 85MPa, the 3d compressive strength is greater than or equal to 100MPa, and the 28d compressive strength is greater than or equal to 130MPa; the strength is high, the early compressive strength is high, the upper structure construction can be carried out as soon as possible, and the construction period is saved.

[0027] (3) The ultra-high performance offshore wind power grouting material provided by the present invention has micro-expansion properties: the vertical expansion rate of 3h is 0.3% to 0.9%, the difference between the vertical expansion rate of 24h and 3h is 0.1% to 0.5%, and the drying shrinkage rate of 28d is -0.01% to 0%. The high vertical expansion rate in the early stage and the lack of shrinkage in the later stage can ensure a tighter connection between the equipment and the foundation.

[0028] (4) The ultra-high performance offshore wind power grouting material provided by the present invention has excellent fatigue resistance after solidification: under the action of 50% failure load amplitude, the grouting connection specimen has no damage after 2 million fatigue tests, and the residual bearing capacity of the specimen after fatigue test is more than 85%, which can effectively guarantee the service life. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0030] For simplicity, this paper only explicitly discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an undefined range; and any lower limit can be combined with other lower limits to form an undefined range. Similarly, any upper limit can be combined with any other upper limit to form an undefined range. Furthermore, although not explicitly stated, every point or individual value between the endpoints of a range is included within that range. Therefore, each point or individual value can be used as its own lower or upper limit, combined with any other point or individual value, or combined with other lower or upper limits to form an undefined range.

[0031] It should be noted that, in the description herein, unless otherwise stated, "above" and "below" include the stated number, and "multiple" in "one or more" means two or more. Relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] In the description of this specification, the references to terms such as "any embodiment / mode," "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0033] The above description of the invention is not intended to describe every disclosed embodiment or implementation. Instead, exemplary embodiments are described in more detail below. These embodiments can be used in various combinations. The examples listed are representative only and should not be construed as exhaustive.

[0034] As described in the background section, existing offshore wind power grouting materials require a high water content, while obtaining fresh water for offshore engineering is difficult, increasing costs. The expansion agents used in existing offshore wind power grouting materials are complex to manufacture, also increasing material costs. Furthermore, concrete prepared from existing offshore wind power grouting materials exhibits significant drying shrinkage in the later stages, resulting in numerous shrinkage cracks in the connection mechanism between the offshore wind turbine support structure and the pile foundation, leading to poor durability.

[0035] Ultra-high performance offshore wind power grouting material:

[0036] The ultra-high performance offshore wind power grouting material provided by this invention comprises, by weight: 600-800 parts cement, 100-200 parts viscosity reducer, 75-150 parts silica fume, 75-150 parts finely ground zeolite powder, 6-8 parts water-reducing agent, 1-2 parts defoamer, 0.1-0.5 parts plastic expansion agent, 50-80 parts crack-resistant agent, 700-900 parts corundum, and 155-170 parts water.

[0037] The cement is grade 52.5 white Portland cement;

[0038] The viscosity reducer is composed of microspheres, limestone powder, ultrafine mineral powder and metakaolin, wherein the proportion of microspheres is 30wt% to 50wt%, the proportion of limestone powder is 15wt% to 35wt%, the proportion of ultrafine mineral powder is 20wt% to 30wt%, and the proportion of metakaolin is 5wt% to 15wt%.

[0039] The plastic expander is composed of azo compound plastic expander and nitroso compound plastic expander in a weight ratio of (0.5-2):1.

[0040] Except for the viscosity reducer, all the raw materials used in this invention are common raw materials, resulting in low cost. The viscosity reducer of this invention meets the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (GB 10424-2018), with a viscosity ratio ≤45%, a fluidity ratio ≥100%, a 7-day compressive strength ≥90%, and a 28-day compressive strength ≥100%. The raw materials are all common raw materials, making preparation simple and cost-effective.

[0041] To reduce the water demand of cement, thereby lowering the cost of obtaining freshwater from the sea, while simultaneously meeting the requirements for concrete strength and slurry fluidity, this invention employs cement with lower water demand and higher strength grade. Preferably, this invention uses 52.5 grade white silicate cement. Compared to the P.II 52.5 ultrafine silicate cement used in the prior art, 52.5 grade white silicate cement has coarser particles, a smaller specific surface area, and lower water demand.

[0042] This invention utilizes silica fume to replace part of the cement, which improves the fluidity of concrete, makes the microstructure of the concrete denser, enhances the early strength and later hardening strength of concrete, improves the resistance of concrete to chloride ion penetration, and strengthens the durability of concrete. In some embodiments of this invention, the silica fume has a SiO2 content ≥94% and a specific surface area ≥15000 m². 2 / kg, and its performance meets the requirements of "Silica Fume for Mortar and Concrete" (GBT 27690-2011).

[0043] This invention utilizes finely ground zeolite powder to replace part of the cement. As an internal curing agent, the finely ground zeolite powder reduces shrinkage, achieving a micro-expansion effect and thus lowering the drying shrinkage rate of concrete in the later stages. The finely ground zeolite powder used in this invention meets the performance requirements of "Mineral Admixtures for High-Strength and High-Performance Concrete" (GB / T 18736-2017).

[0044] This invention adds 3wt‰ to 4wt‰ of water-reducing agent to ultra-high performance offshore wind power grouting material. The water-reducing agent used in this invention is a powdered polycarboxylate high-performance water-reducing agent with a water reduction rate of ≥35%.

[0045] In some embodiments of the present invention, the water-to-material ratio of the ultra-high performance offshore wind power grouting material is 0.08–0.09, with a low freshwater content. It is generally believed that the lower the water-to-material ratio, the worse the fluidity of the grout. The ultra-high performance offshore wind power grouting material provided by the present invention has good fluidity, with an initial fluidity >300 mm, a 30-minute fluidity >270 mm, and a 60-minute fluidity >240 mm.

[0046] This invention adds a defoamer to ultra-high performance offshore wind power grouting material, which can effectively disrupt the surface tension of air bubbles in the grouting material, causing the bubbles to quickly break down and dissipate, thereby reducing voids in the concrete and improving its density, strength, and durability. In some embodiments of this invention, the defoamer used is an organosilicon powder defoamer.

[0047] This invention adds a composite plastic expansion agent to ultra-high performance offshore wind power grouting material as an expansion source during the plastic stage of the grouting material, improving the vertical expansion rate and reducing cracks between the concrete and the connected components. In some embodiments of this invention, the plastic expansion agent used is composed of an azo compound plastic expansion agent and a nitroso compound plastic expansion agent, with a weight ratio of (0.5-2):1, preferably 1:1. Specifically, the azo compound plastic expansion agent is azodimethylamide; and / or, the nitroso compound plastic expansion agent is dinitrospentamethylenetetramine.

[0048] This invention adds an anti-cracking agent to ultra-high performance offshore wind power grouting material, enabling shrinkage compensation throughout the grouting process. In some embodiments of this invention, the anti-cracking agent used is a type I calcium-magnesium composite expanding agent, wherein the magnesium oxide content is 40%.

[0049] This invention adds corundum as fine aggregate to ultra-high performance offshore wind power grouting material and uses a three-gradation method to form the densest packing skeleton, which can improve the strength of concrete. In some embodiments of this invention, the corundum is composed of 8-16 mesh corundum, 20-40 mesh corundum, and 40-70 mesh corundum in a weight ratio of 4:2:3. Wind power grouting materials generally use corundum and quartz sand. Corundum has higher hardness, while manufactured sand and river sand do not meet the quality requirements and are unstable. This invention controls the amount of corundum added, avoiding excessively high costs for this ultra-high performance offshore wind power grouting material. Preparation method:

[0050] The method for preparing ultra-high performance offshore wind power grouting material provided by the present invention includes the following steps:

[0051] Prepare the following by weight: 600-800 parts cement, 100-200 parts viscosity reducer, 75-150 parts silica fume, 75-150 parts finely ground zeolite powder, 6-8 parts water-reducing agent, 1-2 parts defoamer, 0.1-0.5 parts plastic expansion agent, 50-80 parts crack-resistant agent, 700-900 parts corundum, and 155-170 parts water; the cement is grade 52.5 white silicate cement; the viscosity reducer is composed of microspheres. It is composed of limestone powder, ultrafine mineral powder and metakaolin, wherein the proportion of microspheres is 30wt% to 50wt%, the proportion of limestone powder is 15wt% to 35wt%, the proportion of ultrafine mineral powder is 20wt% to 30wt%, and the proportion of metakaolin is 5wt% to 15wt%; the plastic expansion agent is composed of azo compound plastic expansion agent and nitroso compound plastic expansion agent in a weight ratio of (0.5 to 2): 1.

[0052] Cement, viscosity reducer, silica fume, finely ground zeolite powder, water-reducing agent, defoamer, plastic expansion agent, crack-resistant agent, and corundum are mixed evenly to obtain ultra-high performance offshore wind power grouting dry mix.

[0053] Add water to the mixing pot, then add the ultra-high performance offshore wind power grouting dry mix, mix evenly, and you will get the ultra-high performance offshore wind power grouting material.

[0054] In some embodiments of the present invention, after adding the dry-mixed ultra-high performance offshore wind power grouting material, the mixture is first stirred at a low speed for 120s±1s, stopped for 30s, and finally stirred at a high speed for 120s±1s to obtain the ultra-high performance offshore wind power grouting material.

[0055] This preparation method is simple, time-saving, and suitable for on-site preparation.

[0056] application:

[0057] The ultra-high performance offshore wind power grouting material provided by this invention features low water consumption, good fluidity, and low mid-to-late-stage drying shrinkage. When used to connect the support structure of offshore wind turbines to pile foundations, it enhances the durability of the connection mechanism. Furthermore, the high-performance grouting material is easy to pump, with minimal fluidity loss over time, allowing for extended construction periods. The resulting concrete exhibits high early compressive strength, enabling earlier transition to superstructure construction and saving construction time. Under a 50% failure load amplitude, the grouting connection specimens showed no failure after 2 million fatigue tests, with residual bearing capacity exceeding 85% after the fatigue tests, effectively guaranteeing service life. It is particularly suitable for offshore projects with short construction periods and stringent service life requirements.

[0058] Example

[0059] The technical solution of the present invention is described in detail below through embodiments. Unless otherwise specified, the raw materials, equipment, or solvents used are all common raw materials, equipment, or solvents available on the market. Unless otherwise specified, the raw materials with the same name used in the following embodiments and comparative examples are the same raw materials. It should be noted that, except for the viscosity reducer, all raw materials of the ultra-high performance offshore wind power grouting material provided by the present invention are ordinary raw materials purchased from the market, and the raw materials of the viscosity reducer itself can also be purchased from the market.

[0060] The properties of the raw materials used in the ultra-high performance offshore wind power grouting material in the following embodiments are as follows:

[0061] The cement used in the examples is 52.5 grade white silicate cement;

[0062] The silica fume used in this embodiment meets the requirements of "Silica Fume for Mortar and Concrete" (GBT 27690-2011), with SiO2 content ≥94% and specific surface area ≥15000 m². 2 / kg;

[0063] The properties of the finely ground zeolite powder used in the examples meet the requirements of "Mineral Admixtures for High-Strength and High-Performance Concrete" (GB / T18736-2017);

[0064] The water-reducing agent used in the examples is a powdered polycarboxylate high-performance water-reducing agent with a water reduction rate of ≥35%;

[0065] The defoamer used in the examples is an organosilicon powder defoamer;

[0066] The plasticizing agent used in the examples is composed of an azo compound plasticizing agent and a nitroso compound plasticizing agent in a weight ratio of 1:1; the azo compound plasticizing agent is azodimethylamide, and the nitroso compound plasticizing agent is dinitrospentamethylenetetramine.

[0067] The crack-resistant agent used in the examples is a type I calcium-magnesium composite expansion agent, wherein the magnesium oxide content is 40%;

[0068] The diamond abrasive used in the embodiment is composed of 8-16 mesh diamond abrasive, 20-40 mesh diamond abrasive and 40-70 mesh diamond abrasive, with a weight ratio of 4:2:3.

[0069] The viscosity reducer used in the examples is composed of microspheres, limestone powder, ultrafine mineral powder and metakaolin, wherein the proportion of microspheres is 40wt%, limestone powder is 30wt%, ultrafine mineral powder is 25wt%, and metakaolin is 5wt%. The performance of the viscosity reducer meets the requirements of the "Standard for Acceptance of Construction Quality of Railway Concrete Engineering" (GB 10424-2018), with a viscosity ratio ≤45%, a fluidity ratio ≥100%, a 7-day compressive strength ≥90%, and a 28-day compressive strength ≥100%.

[0070] The preparation methods used for the ultra-high performance offshore wind power grouting materials in the following examples and comparative examples are as follows:

[0071] Examples 1-9:

[0072] (1) According to the weight parts in Table 1, cement, viscosity reducer, silica fume, finely ground zeolite powder, water-reducing agent, defoamer, plastic expansion agent, crack-resistant agent and corundum are thoroughly mixed and stirred evenly to obtain ultra-high performance offshore wind power grouting dry mix.

[0073] (2) Add water to the mixing pot according to the weight proportions in Table 1, and then add the ultra-high performance offshore wind power grouting dry mix obtained in step (1). First, stir at low speed for 120s±1s, stop stirring for 30s, and finally stir at high speed for 120s±1s to obtain ultra-high performance offshore wind power grouting.

[0074] Comparative Example 1:

[0075] The preparation method used in Comparative Example 1 is the same as that in Examples 1 to 9. The difference is that the type of cement used in Comparative Example 1 is changed based on Example 1. Comparative Example 1 uses 52.5 grade P.II silicate cement.

[0076] Comparative Example 2:

[0077] The preparation method used in Comparative Example 2 is the same as that in Examples 1 to 9. The difference is that the viscosity reducer was omitted in Comparative Example 2 based on Example 1. At the same time, the weight of the viscosity reducer was added to the cement, silica fume, and finely ground zeolite powder, and the weight of the water-reducing agent and water was slightly increased.

[0078] Comparative Example 3:

[0079] The preparation method used in Comparative Example 3 is the same as that in Examples 1 to 9. The difference is that Comparative Example 3 omits the grinding of zeolite powder based on Example 1, and adds the weight of the viscosity reducer to the cement.

[0080] Comparative Example 4:

[0081] The preparation method used in Comparative Example 4 is the same as that in Examples 1-9, except that the composition of the viscosity reducer in Comparative Example 4 is changed based on that in Example 1: the viscosity reducer used in Comparative Example 4 is composed of microspheres, limestone powder, ultrafine mineral powder and metakaolin, wherein the proportion of microspheres is 20 wt%, the proportion of limestone powder is 20 wt%, the proportion of ultrafine mineral powder is 30 wt%, and the proportion of metakaolin is 30 wt%.

[0082] Table 1 Examples and Comparative Examples (Unit: parts by weight)

[0083]

[0084]

[0085] The ultra-high performance offshore wind power grouting materials obtained in the examples and comparative examples were subjected to relevant tests, and the performance results are shown in Table 2.

[0086] Table 2 Performance test results of the examples and comparative examples

[0087]

[0088] As can be seen from the performance test results of the examples and comparative examples in Table 2, the ultra-high performance offshore wind power grouting materials obtained in Examples 1-9 all meet the design requirements, exhibit good fluidity, excellent mechanical properties, micro-expansion effect, and excellent resistance to chloride ion erosion. This invention uses white cement to reduce the water demand ratio and a viscosity reducer to lower the viscosity, thereby effectively improving the fluidity of the wind power grouting material. The viscosity reducer also benefits the later-stage strength of the wind power grouting material. The use of a composite plastic expansion agent not only ensures the vertical expansion rate but also reduces the adverse effects of the plastic expansion agent on the fluidity and strength of the wind power grouting material. The use of finely ground zeolite powder as an internal curing agent and an anti-cracking agent for shrinkage compensation gives the wind power grouting material a micro-expansion function, ensuring a tighter connection between the equipment and the foundation.

[0089] Comparative Example 1 uses 52.5 grade P.II silicate cement (grey cement), which has a high water requirement, resulting in insufficient fluidity of the wind power grouting material and failing to meet design requirements.

[0090] Comparative Example 2 did not contain a viscosity reducer. The wind power grout itself had a low water content and the grout was too viscous, resulting in insufficient fluidity and failing to meet the design requirements.

[0091] Comparative Example 3, which did not incorporate finely ground zeolite powder and crack-resistant agent, met the design requirements in terms of fluidity, strength, and vertical expansion rate. However, its drying shrinkage increased significantly, making it prone to cracking in the later stages, which led to various diseases and affected the safety and service life of the offshore wind power structure.

[0092] The viscosity reducer incorporated in Comparative Example 4 was not within the viscosity reducer ratio range required by this invention. Although the strength, vertical expansion rate and other indicators met the design requirements, its viscosity reduction effect was poor, resulting in a significant reduction in fluidity and failing to meet the design requirements.

[0093] In summary, the ultra-high performance offshore wind power grouting material provided by this invention has the characteristics of high fluidity, ultra-high strength, ultra-high durability and micro-expansion, which meet the technical requirements of offshore wind power grouting materials. Moreover, the preparation method is simple and suitable for offshore wind turbine foundation grouting construction.

[0094] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A high-performance offshore wind power grouting material, characterized in that, By weight, it includes: 600-800 parts cement, 100-200 parts viscosity reducer, 75-150 parts silica fume, 75-150 parts finely ground zeolite powder, 6-8 parts water-reducing agent, 1-2 parts defoamer, 0.1-0.5 parts plastic expansion agent, 50-80 parts crack-resistant agent, 700-900 parts corundum, and 155-170 parts water; The cement is grade 52.5 white silicate cement; The viscosity reducer is composed of microspheres, limestone powder, ultrafine mineral powder and metakaolin, wherein the proportion of microspheres is 30wt% to 50wt%, the proportion of limestone powder is 15wt% to 35wt%, the proportion of ultrafine mineral powder is 20wt% to 30wt%, and the proportion of metakaolin is 5wt% to 15wt%. The plastic expansion agent is composed of an azo compound plastic expansion agent and a nitroso compound plastic expansion agent in a weight ratio of (0.5-2):

1.

2. The ultra-high performance offshore wind power grouting material as described in claim 1, characterized in that: The water-to-material ratio of the ultra-high performance offshore wind power grouting material is 0.08 to 0.

09.

3. The ultra-high performance offshore wind power grouting material as described in claim 1, characterized in that: The azo compound-based plastic expander is azodimethylamide; and / or, The nitroso compound plastic expander is dinitrosopyramethylenetetramine.

4. The ultra-high performance offshore wind power grouting material as described in claim 1, characterized in that: The silica fume has an SiO2 content of ≥94% and a specific surface area of ​​≥15000 m². 2 / kg.

5. The ultra-high performance offshore wind power grouting material as described in claim 1, characterized in that: The water-reducing agent is a high-performance polycarboxylate powder water-reducing agent with a water reduction rate of ≥35%; the defoamer is an organosilicon powder defoamer.

6. The ultra-high performance offshore wind power grouting material as described in claim 1, characterized in that: The crack-resistant agent is a type I calcium-magnesium composite expansion agent, wherein the magnesium oxide content is 40 wt%.

7. The ultra-high performance offshore wind power grouting material as described in claim 1, characterized in that: The silicon carbide conforms to the closest packing model.

8. The ultra-high performance offshore wind power grouting material as described in claim 7, characterized in that: The corundum is composed of 8-16 mesh corundum, 20-40 mesh corundum and 40-70 mesh corundum in a weight ratio of 4:2:

3.

9. A method for preparing an ultra-high performance offshore wind power grout, characterized in that, Includes the following steps: Prepare the raw materials according to the weight proportions described in claim 1; Cement, viscosity reducer, silica fume, finely ground zeolite powder, water-reducing agent, defoamer, plastic expansion agent, crack-resistant agent, and corundum are mixed evenly to obtain ultra-high performance offshore wind power grouting dry mix. Add water to the mixing pot, then add the ultra-high performance offshore wind power grouting dry mix, mix evenly, and you will get the ultra-high performance offshore wind power grouting material.

10. The application of the ultra-high performance offshore wind power grouting material according to any one of claims 1 to 8 in offshore wind power projects.

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