Wind power grouting material based on modified nano reinforcing agent and preparation method thereof

Abstract

The invention discloses a wind power grouting material based on a modified nano reinforcing agent and a preparation method of the wind power grouting material. The wind power grouting material comprises cement, fine aggregate, a viscosity reducer, modified nano aluminum oxide, modified nano hydrated calcium silicate, an inorganic expanding agent, an additive, steel fibers and water. Wherein the modified nanometer aluminum oxide is nanometer aluminum oxide modified by a silane coupling agent, and the modified nanometer calcium silicate hydrate is nanometer calcium silicate hydrate modified by polyvinyl alcohol. The preparation method comprises the following steps: firstly, adding the viscosity reducer, the modified nano aluminum oxide and the modified nano calcium silicate hydrate into water, and stirring to form slurry; mixing and stirring the cement, the fine aggregate, the inorganic expanding agent and the additive to prepare powder; and finally, mixing and stirring the slurry and the powder, adding steel fibers, and stirring to obtain the wind power grouting material. The wind power grouting material is prepared by compounding the modified nano aluminum oxide and the modified nano hydrated calcium silicate, and has the characteristics of good fluidity, ultrahigh early strength, micro-expansion, erosion resistance and durability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of grouting material, and particularly relates to a wind power grouting material based on a modified nano-enhancing agent and a preparation method thereof. BACKGROUND

[0002] Currently, the onshore wind power development technology is relatively mature, but is gradually limited by land resources and environmental factors. The offshore wind power has become a focus of future development of the wind power industry due to its rich wind energy resources, non-land occupation, stable wind speed and other advantages. In recent years, the installed capacity of offshore wind power has shown explosive growth, and the single machine capacity has broken through 10 megawatts, and the wind farm has gradually expanded to the deep sea. This trend has put extremely strict requirements on the performance of the wind power grouting material.

[0003] Compared with the onshore wind power field, the offshore wind power environment is more complex and harsh. Natural factors such as sea wind, sea wave and sea current not only produce strong dynamic load on the wind power foundation structure, but also cause serious corrosion problems. The offshore wind power grouting material not only needs to have ultra-high strength and excellent fatigue resistance to withstand complex loads such as wind turbine operation and sea wave impact, but also needs to have excellent durability and corrosion resistance. In addition, the particularity of the offshore construction conditions, such as the influence of tidal water and wind wave, also puts extremely high requirements on the construction performance of the grouting material.

[0004] Although the research on the wind power grouting material at home and abroad has made certain progress, there are still many technical bottlenecks to be broken through. In terms of material system, the performance indicators such as strength grade, elastic modulus and durability of the existing grouting material are difficult to meet the needs of the development of large-scale and deep-sea wind power; in terms of construction process, the quality control during the offshore wind power grouting construction process is difficult, and there is a lack of effective monitoring means and construction standards, resulting in uneven engineering quality. Therefore, the research and development of high-performance wind power grouting material has important practical significance for promoting the sustainable development of the wind power industry.

[0005] Research shows that nano-oxide can improve the bending and compressive strength of cement-based materials, and can improve the microstructure of the grouting material, reduce internal defects, better absorb energy, enhance toughness, reduce the risk of cracking caused by wind turbine operation vibration, and prolong the service life. The wind power equipment is subjected to alternating loads for a long time, and the grouting material prepared by compounding nano-aluminum oxide and nano-hydrated calcium silicate has a dense structure and improved performance, and the early and late strengths are obviously improved, which can better withstand long-term fatigue load. The nano-phase can fill the pores, make the microstructure of the grouting material more dense, reduce the connected pores, effectively prevent the invasion of harmful substances such as water and chloride ions, reduce the risk of steel corrosion, and the dense structure makes it difficult for internal water to freeze and expand, reduces the surface spalling and internal damage caused by freeze-thaw cycles, and the frost resistance can reach F200 or above, which can be used in harsh environments such as cold regions.

[0006] Based on this, the present research is a wind power grouting material, based on the basis of nano-oxide, to improve its early and late strength, and at the same time has good fluidity, excellent durability, micro-expansion characteristics. SUMMARY

[0007] The technical problems to be solved by the present application are to provide a wind power grouting material based on nano-oxide and a preparation method thereof, so as to improve its early and late strength, and at the same time has good fluidity, excellent durability, micro-expansion characteristics.

[0008] Technical scheme: The wind power grouting material of the present application adopts modified nano-enhancing agent, which comprises the following raw materials in weight fraction: cement 28-35 parts, fine aggregate 18-25 parts, viscosity reducer 12-16 parts, modified nano-alumina 0.3-0.8 parts, modified nano-hydrated calcium silicate 0.3-0.8 parts, inorganic expanding agent 3-5 parts, additive 0.3-0.5 parts, steel fiber 2-4 parts and water 7-8 parts; the modified nano-alumina is nano-alumina modified by silane coupling agent, and the modified nano-hydrated calcium silicate is nano-hydrated calcium silicate modified by polyvinyl alcohol.

[0009] Further, the modified nano-alumina used in the wind power grouting material is prepared by the following steps:

[0010] (1) mixing and ball milling alumina powder and dispersant to obtain nano-alumina;

[0011] (2) dispersing the nano-alumina in an ethanol-water mixed solution, adjusting the pH to 4-5, adding silane coupling agent, and preparing modified nano-alumina by reaction, filtration, washing and drying;

[0012] Among them, the weight fraction ratio of the alumina powder, dispersant and silane coupling agent is (1-1.5):(0.03-0.05):(0.03-0.045).

[0013] Further, the modified nano-hydrated calcium silicate used in the wind power grouting material comprises the following raw materials in weight fraction: calcium chloride 1.0-2.0 parts, sodium silicate 1.0-2.5 parts, polyvinyl alcohol 0.1-1 parts and dispersant 0.05-0.1 parts.

[0014] Further, the modified nano-hydrated calcium silicate used in the wind power grouting material is prepared by the following steps:

[0015] (1) dissolving calcium chloride in water to obtain a calcium chloride aqueous solution;

[0016] (2) Dissolve sodium silicate in water to prepare sodium silicate aqueous solution, add sodium silicate aqueous solution and dispersant to calcium chloride aqueous solution, adjust pH to 9-11, and stir to obtain nano-hydrated calcium silicate suspension;

[0017] (3) Polyvinyl alcohol was added dropwise to the nano-hydrated calcium silicate suspension to carry out the modification reaction. After stirring the reaction, the mixture was cooled, filtered, washed and dried to obtain modified nano-hydrated calcium silicate.

[0018] Furthermore, the fine aggregate used in this wind power grouting material is dry quartz sand with a particle size of 0.075-2.36mm.

[0019] Furthermore, the viscosity reducer used in this wind power grouting material is a mixture of 7-9 parts by weight of ultrafine mineral powder, 3-4 parts by weight of silica fume, 2-3 parts by weight of rice husk ash, and 0.3-0.6 parts by weight of hydroxypropyl methylcellulose, which is then mixed and dried.

[0020] Furthermore, the inorganic expanding agent used in this wind power grouting material includes 1-2 parts by weight of lightly calcined magnesium oxide and 4-6 parts by weight of calcium sulfoaluminate.

[0021] Furthermore, the admixtures used in this wind power grouting material are a mixture of water-reducing agent, plastic expansion agent, and defoamer in a weight ratio of (8-10):(1-3):(1-3).

[0022] Furthermore, the steel fibers used in this wind power grouting material are copper-plated microfiber steel fibers with a diameter of 0.18-0.23mm and a length of 6-12mm.

[0023] The method for preparing the above-mentioned wind power grouting material according to the present invention includes the following steps:

[0024] (1) Add the viscosity reducer, modified nano alumina and modified nano hydrated calcium silicate to water and stir to form a slurry;

[0025] (2) Mix cement, fine aggregate, inorganic expansion agent and admixture to make powder;

[0026] (3) After mixing the slurry and powder, steel fibers are added and stirred to obtain wind power grouting material.

[0027] Beneficial Effects: Compared with the prior art, the significant advantages of this invention are as follows: This wind power grouting material is prepared by compounding nano-alumina and nano-hydrated calcium silicate, and simultaneously modifying both to obtain modified nano-alumina and modified nano-hydrated calcium silicate. The wind power grouting material prepared based on these two materials has an initial flowability ≥325, a 30-minute flowability ≥295, good fluidity, and excellent self-leveling properties; a 1-day compressive strength ≥81 MPa, a 3-day compressive strength ≥130 MPa, and a 28-day compressive strength ≥166 MPa, exhibiting ultra-high early strength; a 3-hour vertical expansion rate ≤2.0, and a difference between 3 hours and 24 hours ≤0.5, exhibiting micro-expansion; a sulfoaluminate dry-wet cycle count ≥130, and a chloride ion diffusion coefficient ≤1.0×10⁻⁶. -12 It has good corrosion resistance and durability. Detailed Implementation

[0028] The technical solution of the present invention will be further described in detail below with reference to the embodiments.

[0029] It should be noted that, apart from the modified nano-alumina, modified nano-hydrated calcium silicate and viscosity reducer, all the raw materials used in this invention can be purchased commercially, and the raw materials required for the preparation of the modified nano-alumina, modified nano-hydrated calcium silicate and viscosity reducer themselves can also be purchased commercially.

[0030] The ultrafine mineral powder used in the viscosity reducer is a high-performance inorganic admixture made from granulated blast furnace slag processed by ultrafine grinding technology to a specific surface area ≥450 m² / kg (usually 450-800 m² / kg) and a particle size mainly distributed in 1-10 μm. This is a well-known technology in the field.

[0031] The admixtures used in the following embodiments and comparative examples of this invention are a mixture of water-reducing agent, plasticizing agent, and defoamer in a weight ratio of 9:2:1; wherein the water-reducing agent is a polycarboxylate water-reducing agent with a water reduction rate of 25-30%, the defoamer is an organosilicon powder defoamer, and the plasticizing agent is azodicarbonamide. The fine aggregate is dry quartz sand with a particle size of 0.075-2.36 mm. The steel fibers are copper-plated microfiber steel fibers with a diameter of 0.18-0.23 mm and a length of 6-12 mm. The inorganic expanding agent used is a mixture of lightly calcined magnesium oxide and calcium sulfoaluminate in a weight ratio of 2:5. The cement is the known silicate cement.

[0032] Furthermore, the dispersant used in the modification of nano-alumina is oleic acid or polyethylene glycol; the silane coupling agent used is γ-aminopropyltriethoxysilane. The dispersant used in the modification of nano-hydrated calcium silicate is triethanolamine.

[0033] Example 1

[0034] The raw material composition of the wind power grouting material in Example 1 is shown in Table 1 below. The composition of the viscosity reducer is shown in Table 2 below. The composition of the modified nano-alumina is shown in Table 3 below. The composition of the modified nano-hydrated calcium silicate is shown in Table 4 below.

[0035] Table 1. Raw material composition ratio of wind power grouting material in Example 1

[0036]

[0037] Table 2. Raw material composition ratio of the viscosity reducer in Example 1

[0038]

[0039] Table 3. Raw material composition ratio of modified nano-alumina in Example 1

[0040]

[0041] The modified nano-alumina of Example 1 was prepared by the following steps:

[0042] (1) After mixing alumina powder with polyethylene glycol, the mixture is ground at high speed (200-500 r / min) for 1 hour in a high-energy planetary ball mill to obtain nano alumina.

[0043] (2) Prepare an ethanol-water mixed solution (volume ratio 4:1), disperse nano-alumina in the solution, adjust pH to 4-5, add γ-aminopropyltriethoxysilane, reflux at 70°C for 4 hours, filter, wash and vacuum dry at 120°C to finally obtain modified nano-alumina.

[0044] Table 4. Raw material composition of the modified nano-hydrated calcium silicate in Example 1

[0045]

[0046] The modified nano-hydrated calcium silicate of Example 1 was prepared by the following steps:

[0047] (1) Dissolve calcium chloride in 200-300 mL of water, put it into a stirring synthesis device, set the stirring speed to 100-200 r / min, heat it to 100℃ at 10℃ / min, and then stir it at a constant temperature for 120 min.

[0048] (2) Dissolve sodium silicate in 300-400 mL of water, add it to a stirring synthesis device and stir, while adding triethanolamine and using sodium hydroxide to control the pH at 9-11. Continue stirring at a constant temperature for 120 min to obtain a nano-hydrated calcium silicate suspension.

[0049] (3) Polyvinyl alcohol was added dropwise to the nano-hydrated calcium silicate suspension to carry out the modification reaction. The mixture was stirred at a constant temperature for 180 min. After cooling, filtration, washing and drying, the modified nano-hydrated calcium silicate was obtained.

[0050] Example 1 describes the preparation of wind power grouting material based on modified nano-alumina and modified nano-hydrated calcium silicate, specifically including the following steps:

[0051] (1) Add viscosity reducer, modified nano alumina and modified nano hydrated calcium silicate to 8 parts of water and stir for 1 min to form a slurry;

[0052] (2) Mix cement, fine aggregate, inorganic expansion agent and admixture for 1 minute to make powder;

[0053] (3) Mix the slurry and powder together and stir for 2 minutes. Finally, add steel fiber and stir for 1-2 minutes to obtain the wind power grouting material.

[0054] Example 2

[0055] The raw material composition of the wind power grouting material in Example 2 is shown in Table 5 below. The composition of the viscosity reducer is the same as in Example 1. The composition of the modified nano-alumina is shown in Table 6 below, and the preparation process is the same as in Example 1. The composition and preparation process of the modified nano-hydrated calcium silicate are the same as in Example 1. The preparation process of the wind power grouting material in Example 2 is the same as in Example 1.

[0056] Table 5. Raw material composition ratio of wind power grouting material in Example 2

[0057]

[0058] Table 6. Raw material composition ratio of modified nano-alumina in Example 2

[0059]

[0060] Example 3

[0061] The raw material composition of the wind power grouting material in Example 3 is shown in Table 7 below. The composition of the viscosity reducer is shown in Table 8 below. The composition and preparation process of the modified nano-alumina are the same as in Example 1. The composition and preparation process of the modified nano-hydrated calcium silicate are the same as in Example 1. The preparation process of the wind power grouting material in Example 3 is the same as in Example 1.

[0062] Table 7 Raw material composition of wind power grouting material in Example 3

[0063]

[0064] Table 8 Raw material composition of the viscosity reducer in Example 3

[0065]

[0066] Example 4

[0067] The raw material composition of the wind power grouting material in Example 4 is shown in Table 9 below. The composition of the viscosity reducer is shown in Table 10 below. The composition of the modified nano-alumina is shown in Table 11 below. The composition of the modified nano-hydrated calcium silicate is shown in Table 12 below. The preparation process of the wind power grouting material in Example 4 is the same as that in Example 1.

[0068] Table 9 Raw material composition of wind power grouting material in Example 4

[0069]

[0070] Table 10 Raw material composition of the viscosity reducer in Example 4

[0071]

[0072] Table 11 Raw material composition of modified nano-alumina in Example 4

[0073]

[0074] The modified nano-alumina of Example 4 was prepared by the following steps:

[0075] (1) After mixing alumina powder with polyethylene glycol, the mixture is ground at high speed (200-500 r / min) for 1 hour in a high-energy planetary ball mill to obtain nano alumina.

[0076] (2) Prepare an ethanol-water mixed solution (volume ratio 4:1), disperse nano-alumina in the solution, adjust pH to 4-5, add γ-aminopropyltriethoxysilane, reflux at 70°C for 4 hours, filter, wash and vacuum dry at 120°C to finally obtain modified nano-alumina.

[0077] Table 12 Raw material composition of modified nano-hydrated calcium silicate in Example 4

[0078]

[0079] The modified nano-hydrated calcium silicate of Example 4 was prepared by the following steps:

[0080] (1) Dissolve calcium chloride in 200-300 mL of water, put it into a stirring synthesis device, set the stirring speed to 100-200 r / min, heat it to 100℃ at 10℃ / min, and then stir it at a constant temperature for 120 min.

[0081] (2) Dissolve sodium silicate in 300-400 mL of water, add it to a stirring synthesis device and stir, while adding triethanolamine and using sodium hydroxide to control the pH at 9-11. Continue stirring at a constant temperature for 120 min to obtain a nano-hydrated calcium silicate suspension.

[0082] (3) Polyvinyl alcohol was added dropwise to the nano-hydrated calcium silicate suspension to carry out the modification reaction. The mixture was stirred at a constant temperature for 180 min. After cooling, filtration, washing and drying, the modified nano-hydrated calcium silicate was obtained.

[0083] Example 4 describes the preparation of wind power grouting material based on modified nano-alumina and modified nano-hydrated calcium silicate, specifically including the following steps:

[0084] (1) Add viscosity reducer, modified nano alumina and modified nano hydrated calcium silicate to 8 parts of water and stir for 1 min to form a slurry;

[0085] (2) Mix cement, fine aggregate, inorganic expansion agent and admixture for 1 minute to make powder;

[0086] (3) Mix the slurry and powder together and stir for 2 minutes. Finally, add steel fiber and stir for 1-2 minutes to obtain the wind power grouting material.

[0087] Example 5

[0088] The raw material composition of the wind power grouting material in Example 5 is shown in Table 13 below, and the preparation process is the same as in Example 1. The composition of the viscosity reducer is shown in Table 14 below. The composition of the modified nano-alumina is shown in Table 15 below, and the preparation process is the same as in Example 1. The composition of the modified nano-hydrated calcium silicate is shown in Table 16 below, and the preparation process is the same as in Example 1. The preparation process of the wind power grouting material in Example 5 is the same as in Example 1.

[0089] Table 13 Raw material composition of wind power grouting material in Example 5

[0090]

[0091] Table 14 Raw material composition of the viscosity reducer in Example 5

[0092]

[0093] Table 15 Raw material composition of modified nano-alumina in Example 5

[0094]

[0095] Table 16 Raw material composition of modified nano-hydrated calcium silicate in Example 5

[0096]

[0097] Example 6

[0098] The raw material composition of the wind power grouting material in Example 6 is shown in Table 17 below, and the preparation process is the same as in Example 1. The composition of the viscosity reducer is shown in Table 18 below. The composition of the modified nano-alumina is shown in Table 19 below, and the preparation process is the same as in Example 1. The composition of the modified nano-hydrated calcium silicate is shown in Table 20 below, and the preparation process is the same as in Example 1. The preparation process of the wind power grouting material in Example 6 is the same as in Example 1.

[0099] Table 17 Raw material composition of wind power grouting material in Example 65

[0100]

[0101] Table 18 Raw material composition of the viscosity reducer in Example 6

[0102]

[0103] Table 19 Raw material composition of modified nano-alumina in Example 6

[0104]

[0105] Table 20 Raw material composition of modified nano-hydrated calcium silicate in Example 6

[0106]

[0107] Comparative Example 1

[0108] The basic steps are the same as in Example 1, except that modified nano-alumina is not used.

[0109] Comparative Example 2

[0110] The basic steps are the same as in Example 1, except that nano-hydrated calcium silicate is used instead of modified alumina, that is, the proportion of nano-hydrated calcium silicate added is 1.1 parts.

[0111] Comparative Example 3

[0112] The basic steps are the same as in Example 1. The difference is that when preparing the grout, the viscosity reducer, modified nano alumina and modified nano hydrated calcium silicate are directly mixed with other raw materials, and then water is added for stirring and reaction.

[0113] Performance testing

[0114] The grouting materials prepared in the above embodiments and comparative examples were subjected to performance testing, and the results are shown in Table 21 below.

[0115] Table 21 Performance test results of the grouting materials prepared in the examples and comparative examples

[0116]

[0117] As shown in Table 30, the ultra-high early strength wind power grouting material prepared by this invention has an initial flowability ≥325, a 30-minute flowability ≥295, and good fluidity; a 1-day compressive strength ≥81 MPa, a 3-day compressive strength ≥130 MPa, and a 28-day compressive strength ≥166 MPa, exhibiting ultra-high early strength characteristics; a 3-hour vertical expansion rate ≤2.0, and a difference between 3 hours and 24 hours ≤0.5, exhibiting micro-expansion characteristics; a sulfoaluminate dry-wet cycle count ≥130, and a chloride ion diffusion coefficient ≤1.0×10⁻⁶. -12 It exhibits excellent corrosion resistance and durability. Furthermore, a viscosity reducer was added to the comparative sample, resulting in an overall flowability ≥325 and a 30-minute flowability ≥295.

[0118] Based on the performance data of Example 1 and Comparative Examples 1 and 2, it is evident that the simultaneous use of modified nano-alumina and modified nano-hydrated calcium silicate can effectively improve the strength of the grout, effectively inhibit microcrack propagation, and hinder Cl⁻ penetration. Furthermore, combining Example 1 and Comparative Example 3, it is shown that premixing the two materials can further enhance the strength of the prepared grout. Further theoretical analysis based on the experimental results indicates that the particle size of nano-alumina and nano-hydrated calcium silicate is much smaller than the micron-sized cement particles, which can fill the nano-sized pores between cement hydration products, enhancing density. Moreover, the modified nano-hydrated calcium silicate has a secondary hydration effect, generating more hydrated calcium silicate gel to fill pores, optimizing the interfacial transition zone (ITZ) structure, significantly improving the early and late strength of the grout, and enhancing its resistance to chemical attack.

[0119] Furthermore, in modifying nano-alumina and nano-hydrated calcium silicate, this invention utilizes the different functional groups at both ends of the modified material to form hydrogen bonds with the hydroxyl groups on the surface of nano-alumina and nano-hydrated calcium silicate. This allows the modified material to be tightly adsorbed onto the surface of nano-alumina and nano-hydrated calcium silicate, enhancing interfacial bonding. By pre-mixing and dispersing the modified nano-alumina and modified nano-hydrated calcium silicate, the strength can be effectively improved and the chloride ion diffusion coefficient reduced. Analysis reveals that the pre-mixing of nano-hydrated calcium silicate modified with polyvinyl alcohol and nano-alumina modified with a silane coupling agent, through the combination of the silane coupling agent and polyvinyl alcohol, enhances the bonding between nano-alumina and hydrated calcium silicate. Therefore, during the secondary hydration of nano-hydrated calcium silicate, the nano-alumina can react with the hydration products, further densifying the bond between the pores and ultimately improving the overall strength of the grout.

[0120] Furthermore, based on the data from Example 1, Comparative Example 1, and Comparative Example 2, it can be seen that using the two in appropriate proportions can effectively improve the fluidity and stability of the grouting material, giving it good self-leveling properties.

[0121] In addition to the above embodiments, it should be noted that the technical effects claimed above can be obtained by using the raw material composition, proportion and preparation process of the present invention, and therefore no further experimental verification is required.

Claims

1. A wind power grout based on modified nano-reinforcement agent, characterized in that, The cement-based wind power pile grouting material comprises the following raw materials in parts by weight: cement 28-35 parts, fine aggregate 18-25 parts, viscosity reducer 12-16 parts, modified nano-aluminum oxide 0.3-0.8 parts, modified nano-hydrated calcium silicate 0.3-0.8 parts, inorganic expanding agent 3-5 parts, additive 0.3-0.5 parts, steel fiber 2-4 parts and water 7-8 parts; the modified nano-aluminum oxide is nano-aluminum oxide modified by a silane coupling agent, and the modified nano-hydrated calcium silicate is nano-hydrated calcium silicate modified by polyvinyl alcohol.

2. The wind power grout based on modified nano-reinforcement according to claim 1, characterized in that, The modified nano-aluminum oxide is prepared by the following steps: (1) mixing and ball-milling aluminum oxide powder and a dispersing agent to obtain nano-aluminum oxide; (2) dispersing the nano-aluminum oxide in an ethanol-water mixed solution, adjusting the pH to 4-5, adding a silane coupling agent, and preparing the modified nano-aluminum oxide through reaction, filtration, washing and drying; wherein the weight ratio of the aluminum oxide powder, the dispersing agent and the silane coupling agent is (1-1.5):(0.03-0.05):(0.03-0.045).

3. The wind power grout based on modified nano-reinforcement according to claim 1, characterized in that, The modified nano-hydrated calcium silicate comprises the following raw materials in parts by weight: calcium chloride 1.0-2.0 parts, sodium silicate 1.0-2.5 parts, polyvinyl alcohol 0.1-1 parts and a dispersing agent 0.05-0.1 parts.

4. The wind power grout based on modified nano-reinforcement according to claim 3, characterized in that, The modified nano-hydrated calcium silicate is prepared by the following steps: (1) dissolving calcium chloride in water to obtain a calcium chloride aqueous solution; (2) dissolving sodium silicate in water to prepare a sodium silicate aqueous solution, adding the sodium silicate aqueous solution and a dispersing agent to the calcium chloride aqueous solution, adjusting the pH to 9-11, and stirring to obtain a nano-hydrated calcium silicate suspension; (3) adding polyvinyl alcohol dropwise to the nano-hydrated calcium silicate suspension for modification reaction, stirring after reaction, and cooling, filtering, washing and drying to obtain the modified nano-hydrated calcium silicate.

5. The wind power grout based on modified nano-reinforcement agent according to claim 1, characterized in that, The fine aggregate is dry quartz sand with a particle size of 0.075-2.36 mm.

6. The wind power grout based on modified nano-reinforcement agent according to claim 1, characterized in that, The viscosity reducer is a mixture of 7-9 parts by weight of superfine mineral powder, 3-4 parts by weight of silica fume, 2-3 parts by weight of rice husk ash and 0.3-0.6 parts by weight of hydroxypropyl methyl cellulose, which is mixed and dried.

7. The wind power grout based on modified nano-reinforcement agent according to claim 1, characterized in that, The inorganic expanding agent comprises 1-2 parts by weight of light-burned magnesium oxide and 4-6 parts by weight of calcium sulfoaluminate.

8. The wind power grout based on modified nano-reinforcement agent according to claim 1, characterized in that, The additive is a mixture of water reducing agent, plastic expanding agent and defoaming agent in a weight ratio of (8-10):(1-3):(1-3).

9. The wind power grout based on modified nano-reinforcement agent according to claim 1, characterized in that, The steel fiber is copper-plated micro-wire steel fiber with a diameter of 0.18-0.23 mm and a length of 6-12 mm.

10. A method of preparing the wind turbine grout of claim 1, characterized by, The method comprises the following steps: (1) adding the viscosity reducer, the modified nano-aluminum oxide and the modified nano-hydrated calcium silicate into water, and stirring to form a slurry; (2) mixing and stirring cement, fine aggregate, inorganic expanding agent and additive to prepare a powder; (3) mixing and stirring the slurry and the powder, adding steel fiber, and stirring to obtain the cement-based wind power pile grouting material.

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