A micro-expansion high-strength offshore wind power grouting material and preparation method thereof

Abstract

The invention discloses a micro-expansion high-strength offshore wind power grouting material and a preparation method thereof, comprising ultrafine cement, fine aggregate, micro-nano powder, expansion component, microcapsule plastic expansion agent and water reducer, wherein the microcapsule plastic expansion agent is composed of calcium carbide core material and silicone resin wall material; during preparation, ultrafine cement, fine aggregate, micro-nano powder and expansion component are first mixed and stirred to obtain powder A, then microcapsule plastic expansion agent and water reducer are mixed and stirred to obtain powder B, and finally powder A and powder B are mixed and stirred to obtain micro-expansion high-strength offshore wind power grouting material. The grouting material has high fluidity, is easy to construct, has ultra-high strength and micro-expansion, has no shrinkage in the later stage, and can be used for grouting of offshore wind power foundation.

Description

Technical Field

[0001] The invention belongs to the field of grouting material preparation, and in particular relates to a micro-expansion high-strength offshore wind power grouting material and a preparation method thereof. Background Art

[0002] Wind power grouting materials are mainly used in offshore wind power construction, including grouting of upper modules of offshore substations, grouting of foundations of offshore substation jackets, grouting of transition sections of single piles, underwater grouting of foundations of wind turbine jackets, and structural grouting of connectors of wind turbine foundation anti-collision facilities. The wind power grouting connection section connects the upper structure and the pile foundation into a whole and plays a transitional role, which is a key link in the entire foundation structure. The construction of offshore wind turbine foundation structures is far more complicated than that on land, with high technical difficulty and a cost of up to 15%-25% of the total cost. The particularity of offshore wind power grouting is that the material is required to have high fluidity and high stability during the pumping stage, and the grouting material is required to have ultra-high strength, micro-expansion and high durability after hardening.

[0003] Compared with the stringent technical requirements of wind power grouting, the current high-end domestic grouting products can generally solve special needs for a single indicator. For example, the special mortar for high-speed rail supports mainly solves high fluidity and high hourly strength. The grouting materials used for prefabricated component node connections in residential industrialization projects require high fluidity, high filling properties and high strength. The grouting materials for holes in prestressed structures mainly solve the problem of grouting of holes, etc. However, the strength and durability of these grouting materials are not high and cannot meet the grouting requirements of offshore wind turbines.

[0004] Therefore, there is an urgent need for a micro-expansion grouting material for offshore wind turbine grouting, which has high flow viscosity and high stability in the early grouting stage, and has ultra-high strength, micro-expansion and high durability after the grouting hardens. Summary of the invention

[0005] Purpose of the invention: The first purpose of the present invention is to provide a grouting material suitable for offshore wind power that has high flow viscosity and high stability during the initial grouting, and has ultra-high strength, micro-expansion and high durability after the grout hardens;

[0006] The second object of the present invention is to provide a method for preparing the above grouting material.

[0007] Technical solution: The micro-expanding high-strength offshore wind power grouting material of the present invention includes the following raw materials by weight: 35-45 parts of ultrafine cement, 35-45 parts of fine aggregate, 10-15 parts of micro-nano powder, 5-10 parts of expansion component, 0.05-0.1 parts of microcapsule plastic expansion agent and 0.4-0.5 parts of water reducer; wherein the microcapsule plastic expansion agent is composed of a calcium carbide core material and a silicone resin wall material with a core-to-wall mass ratio of 1:1.2-1.5.

[0008] The present invention is based on the basic components of ultrafine cement, fine aggregate and water reducing agent, and compounded with micro-nano powder, expansion component and microcapsule plastic expansion agent to form a grouting material suitable for offshore wind power. The grouting material has an initial fluidity of ≥310mm and a 30min fluidity of ≥290mm during application, has high fluidity and a long construction time; has a 1d compressive strength of ≥85MPa, a 3d compressive strength of ≥120MPa, and a 28d compressive strength of ≥140MPa, and has ultra-high strength; has a 3h vertical expansion rate of 1.5-2.1%, a difference between the 24h and 3h vertical expansion rates of 0.12-0.%, a 28d drying autogenous shrinkage of 0.12-0.2%, a slight expansion in the early stage and no shrinkage in the later stage; has good durability, and gives the grouting material a longer service life.

[0009] Among them, the compounded micro-nano powder of the present invention is applied to offshore wind power grouting materials to have an active effect and a filling effect, which greatly improves the mechanical properties of offshore wind power grouting materials, and at the same time enhances the density of offshore wind power grouting materials and improves their durability; the compounded microcapsule plastic expansion agent composed of calcium carbide core material and silicone resin wall material can realize the slow release of gas generated by calcium carbide, while the silicone resin reacts with cement hydration products and Ca(OH) generated by calcium carbide. 2 Reaction, calcium ions are grafted onto the silicone, forming a bridging effect, which improves the toughness of the grouting material.

[0010] Furthermore, the microcapsule plastic expansion agent used in the grouting material of the present invention is prepared by the following steps: after atomizing the silicone resin to form microdroplets, calcium carbide is added at a core-to-wall ratio of 1:1.2-1.5 to form a microcapsule plastic expansion agent in which the silicone resin encapsulates calcium carbide.

[0011] Furthermore, the micro-nano powder used in the grouting material of the present invention is prepared by the following steps: the mineral powder, the calcium silicate hydrate seed crystal, and the triisopropanolamine are mixed and homogenized in a mass ratio of 1: (0.01-0.05): (0.0003-0.0005), and then ground for 3-5 hours to obtain a particle size D 50 Micro-nano powder ≤2μm.

[0012] Furthermore, the grinding body used in the grouting material of the present invention is composed of 4mm, 6mm, and 8mm steel micro-balls in a ratio of 3:3:4, the planetary factor is 6.8-7.2, the ball-to-material ratio is 0.55-0.6, the rotation speed is 800-1000r / min, and the speed ratio is 1:0.5-0.6.

[0013] Furthermore, the ultrafine cement used in the grouting material of the present invention is P.Ⅱ52.5 ultrafine silicate cement, with a particle size D50≤6μm, a 3d compressive strength≥50MPa, and a 28d compressive strength≥70MPa.

[0014] Furthermore, the fine aggregate used in the grouting material of the present invention is composed of 10-30 mesh quartz sand, 30-55 mesh quartz sand and 55-100 mesh quartz sand in a mass ratio of 1: (0.9-1.2): (0.3-0.5).

[0015] Furthermore, the expansion component used in the grouting material of the present invention is a calcium sulphoaluminate expansion agent, and the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is ≥28%.

[0016] The present invention prepares the above-mentioned micro-expansion high-strength offshore wind power grouting material, comprising the following steps:

[0017] (1) mixing ultrafine cement, fine aggregate, micro-nano powder and expansion component to prepare powder A;

[0018] (2) mixing and stirring the microcapsule plastic expansion agent and the water reducing agent to obtain powder B;

[0019] (3) Powder A and powder B are mixed and stirred to obtain a slightly expanded high-strength offshore wind power grouting material.

[0020] Beneficial effects: Compared with the prior art, the significant advantages of the present invention are: the initial fluidity of the grouting material during application is ≥310mm, the 30min fluidity is ≥290mm, and it has high fluidity viscosity; the construction time is long; the 1d compressive strength is ≥85MPa, the 3d compressive strength is ≥120MPa, and the 28d compressive strength is ≥140MPa, with ultra-high strength; the 3h vertical expansion rate is 1.5-2.1%, the difference between the 24h and 3h vertical expansion rates is 0.12-0.%, and the 28d drying shrinkage is 0.12-0.2%, with slight expansion in the early stage and no shrinkage in the later stage; the durability is good, giving the grouting material a longer service life. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described in detail below in conjunction with the embodiments. It should be noted that, except for the micro-nano powder and microcapsule plastic expansion agent, the raw materials used in the present invention can be purchased from the market, and the raw materials used in the preparation of the micro-nano powder and microcapsule plastic expansion agent can also be purchased from the market.

[0022] In the following examples, the expansion component used is calcium sulfoaluminate expansion agent. The water reducer is a polycarboxylic acid high-performance water reducer with a water reduction rate of ≥28%. The fine aggregate is composed of 10-30 mesh quartz sand, 30-55 mesh quartz sand and 55-100 mesh quartz sand in a mass ratio of 1: (0.9-1.2): (0.3-0.5). The ultrafine cement is P.Ⅱ52.5 ultrafine silicate cement with a particle size D50≤6μm, a 3d compressive strength of ≥50MPa, and a 28d compressive strength of ≥70MPa.

[0023] Example 1

[0024] The raw materials used in the slightly expanded high-strength offshore wind power grouting material of this embodiment are shown in Table 1 below.

[0025] Table 1 Raw material composition used in Example 1

[0026] raw material Ultrafine cement Micro-nano powder fine aggregate Expansion components Microcapsule plastic expansion agent Water reducing agent Content / kg 45 10 35 10 0.1 0.5

[0027] Among them, the raw materials used for the micro-nano powder in the micro-expanded high-strength offshore wind power grouting material are shown in Table 2 below.

[0028] Table 2 Raw material composition of micro-nano powder used in Example 1

[0029] raw material Mineral powder Calcium silicate hydrate seed Triisopropanolamine Content / kg 99 1 0.05

[0030] The preparation method of the micro-nano powder in the micro-expansion high-strength offshore wind power grouting material comprises the following steps:

[0031] (1) mixing and homogenizing the mineral powder, calcium silicate hydrate seed crystals and triisopropanolamine in proportion;

[0032] (2) Grinding in a high-energy planetary ball mill for 3 h, the grinding body is composed of 4 mm, 6 mm, and 8 mm steel micro-balls in a ratio of 3:3:4, the planetary factor is 6.8, the ball-to-material ratio is 0.6, the rotation speed is 800 r / min, and the speed ratio is 1:0.6;

[0033] (3) The ground powder is passed through an ultrafine powder separator to obtain micro-nano powder with a particle size of D 50 ≤2μm.

[0034] The microcapsule plastic expansion agent of this embodiment is prepared by the following steps: atomizing the silicone resin through a spray dryer at a rate of 18-20 mL / min to form micro droplets as wall material; adding calcium carbide at a core-to-wall ratio of 1:1.5 so that the atomized silicone resin is wrapped on the surface of the calcium carbide to form a microcapsule plastic expansion agent.

[0035] The method for preparing the micro-expansion high-strength offshore wind power grouting material of this embodiment comprises the following steps:

[0036] (1) mixing ultrafine cement, fine aggregate, micro-nano powder and expansion component to prepare powder A;

[0037] (2) mixing and stirring the microcapsule plastic expansion agent and the water reducing agent to obtain powder B;

[0038] (3) Powder A and powder B are mixed and stirred to obtain a slightly expanded high-strength offshore wind power grouting material.

[0039] Example 2

[0040] The raw materials used in the slightly expanded high-strength offshore wind power grouting material of this embodiment are shown in Table 3 below.

[0041] Table 3 Raw material composition used in Example 2

[0042] raw material Ultrafine cement Micro-nano powder fine aggregate Expansion components Microcapsule plastic expansion agent Water reducing agent Content / kg 42 12 38 8 0.09 0.47

[0043] Among them, the raw materials used for the micro-nano powder in the micro-expanded high-strength offshore wind power grouting material are shown in Table 4 below.

[0044] Table 4 Raw material composition of micro-nano powder used in Example 2

[0045] raw material Mineral powder Calcium silicate hydrate seed Triisopropanolamine Content / kg 98 2 0.045

[0046] The preparation method of the micro-nano powder in the micro-expansion high-strength offshore wind power grouting material comprises the following steps:

[0047] (1) mixing and homogenizing the mineral powder, calcium silicate hydrate seed crystals and triisopropanolamine in proportion;

[0048] (2) Grinding in a high-energy planetary ball mill for 3.5 h, the grinding body is composed of 4 mm, 6 mm, and 8 mm steel micro-balls in a ratio of 3:3:4, the planetary factor is 6.9, the ball-to-material ratio is 0.58, the rotation speed is 850 r / min, and the speed ratio is 1:0.6;

[0049] (3) The ground powder is passed through an ultrafine powder separator to obtain micro-nano powder with a particle size of D 50 ≤2μm.

[0050] The microcapsule plastic expansion agent of this embodiment is prepared by the following steps: atomizing the silicone resin through a spray dryer at a rate of 18-20 mL / min to form micro droplets as wall material; adding calcium carbide at a core-to-wall ratio of 1:1.5 so that the atomized silicone resin is wrapped on the surface of the calcium carbide to form a microcapsule plastic expansion agent.

[0051] The preparation method of the micro-expansion high-strength offshore wind power grouting material of this embodiment comprises the following steps:

[0052] (1) mixing ultrafine cement, fine aggregate, micro-nano powder and expansion component to prepare powder A;

[0053] (2) mixing and stirring the microcapsule plastic expansion agent and the water reducing agent to obtain powder B;

[0054] (3) Powder A and powder B are mixed and stirred to obtain a slightly expanded high-strength offshore wind power grouting material.

[0055] Example 3

[0056] The raw materials used in the slightly expanded high-strength offshore wind power grouting material of this embodiment are shown in Table 5 below.

[0057] Table 5 Raw material composition used in Example 3

[0058] raw material Ultrafine cement Micro-nano powder fine aggregate Expansion components Microcapsule plastic expansion agent Water reducing agent Content / kg 40 13 40 7 0.08 0.45

[0059] Among them, the raw materials used for the micro-nano powder in the micro-expanded high-strength offshore wind power grouting material are shown in Table 6 below.

[0060] Table 6 Raw material composition of micro-nano powder used in Example 3

[0061] raw material Mineral powder Calcium silicate hydrate seed Triisopropanolamine Content / kg 97 3 0.04

[0062] The preparation method of the micro-nano powder in the micro-expansion high-strength offshore wind power grouting material comprises the following steps:

[0063] (1) mixing and homogenizing the mineral powder, calcium silicate hydrate seed crystals and triisopropanolamine in proportion;

[0064] (2) Grinding in a high-energy planetary ball mill for 4 h, the grinding body is composed of 4 mm, 6 mm, and 8 mm steel micro-balls in a ratio of 3:3:4, the planetary factor is 7.0, the ball-to-material ratio is 0.57, the rotation speed is 900 r / min, and the speed ratio is 1:0.55;

[0065] (3) The ground powder is passed through an ultrafine powder separator to obtain micro-nano powder with a particle size of D 50 ≤2μm.

[0066] The microcapsule plastic expansion agent of this embodiment is prepared by the following steps: atomizing the silicone resin through a spray dryer at a rate of 18-20 mL / min to form micro droplets as wall material; adding calcium carbide at a core-to-wall ratio of 1:1.5 so that the atomized silicone resin is wrapped on the surface of the calcium carbide to form a microcapsule plastic expansion agent.

[0067] The preparation method of the micro-expansion high-strength offshore wind power grouting material comprises the following steps:

[0068] (1) mixing ultrafine cement, fine aggregate, micro-nano powder and expansion component to prepare powder A;

[0069] (2) mixing and stirring the microcapsule plastic expansion agent and the water reducing agent to obtain powder B;

[0070] (3) Powder A and powder B are mixed and stirred to obtain a slightly expanded high-strength offshore wind power grouting material.

[0071] Example 4

[0072] The raw materials used in the slightly expanded high-strength offshore wind power grouting material of this embodiment are shown in Table 7 below.

[0073] Table 7 Raw material composition used in Example 4

[0074] raw material Ultrafine cement Micro-nano powder fine aggregate Expansion components Microcapsule plastic expansion agent Water reducing agent Content / kg 37 14 43 6 0.06 0.43

[0075] Among them, the raw materials used for the micro-nano powder in the micro-expanded high-strength offshore wind power grouting material are shown in Table 8 below.

[0076] Table 8 Raw material composition of micro-nano powder used in Example 4

[0077] raw material Mineral powder Calcium silicate hydrate seed Triisopropanolamine Content / kg 96 4 0.035

[0078] The preparation method of the micro-nano powder in the micro-expansion high-strength offshore wind power grouting material comprises the following steps:

[0079] (1) mixing and homogenizing the mineral powder, calcium silicate hydrate seed crystals and triisopropanolamine in proportion;

[0080] (2) Grinding in a high-energy planetary ball mill for 4.5 h, the grinding body is composed of 4 mm, 6 mm, and 8 mm steel micro-balls in a ratio of 3:3:4, the planetary factor is 7.1, the ball-to-material ratio is 0.56, the rotation speed is 950 r / min, and the speed ratio is 1:0.55;

[0081] (3) The ground powder is passed through an ultrafine powder separator to obtain micro-nano powder with a particle size of D 50 ≤2μm.

[0082] The microcapsule plastic expansion agent of this embodiment is prepared by the following steps: atomizing the silicone resin through a spray dryer at a rate of 18-20 mL / min to form micro droplets as wall material; adding calcium carbide at a core-to-wall ratio of 1:1.5 so that the atomized silicone resin is wrapped on the surface of the calcium carbide to form a microcapsule plastic expansion agent.

[0083] The preparation method of the micro-expansion high-strength offshore wind power grouting material comprises the following steps:

[0084] (1) mixing ultrafine cement, fine aggregate, micro-nano powder and expansion component to prepare powder A;

[0085] (2) mixing and stirring the microcapsule plastic expansion agent and the water reducing agent to obtain powder B;

[0086] (3) Powder A and powder B are mixed and stirred to obtain a slightly expanded high-strength offshore wind power grouting material.

[0087] Example 5

[0088] The raw materials used in the slightly expanded high-strength offshore wind power grouting material of this embodiment are shown in Table 9 below.

[0089] Table 9 Raw material composition used in Example 5

[0090] raw material Ultrafine cement Micro-nano powder fine aggregate Expansion components Microcapsule plastic expansion agent Water reducing agent Content / kg 35 15 45 5 0.05 0.4

[0091] Among them, the raw materials used for the micro-nano powder in the micro-expanded high-strength offshore wind power grouting material are shown in Table 10 below.

[0092] Table 10 Raw material composition of micro-nano powder used in Example 5

[0093] raw material Mineral powder Calcium silicate hydrate seed Triisopropanolamine Content / kg 95 5 0.03

[0094] The preparation method of the micro-nano powder in the micro-expansion high-strength offshore wind power grouting material comprises the following steps:

[0095] (1) mixing and homogenizing the mineral powder, calcium silicate hydrate seed crystals and triisopropanolamine in proportion;

[0096] (2) Grinding in a high-energy planetary ball mill for 5 h, the grinding body is composed of 4 mm, 6 mm, and 8 mm steel micro-balls in a ratio of 3:3:4, the planetary factor is 7.2, the ball-to-material ratio is 0.55, the rotation speed is 1000 r / min, and the speed ratio is 1:0.5;

[0097] (3) The ground powder is passed through an ultrafine powder separator to obtain micro-nano powder with a particle size of D 50 ≤2μm.

[0098] The microcapsule plastic expansion agent of this embodiment is prepared by the following steps: atomizing the silicone resin through a spray dryer at a rate of 18-20 mL / min to form micro droplets as wall material; adding calcium carbide at a core-to-wall ratio of 1:1.2 so that the atomized silicone resin is wrapped on the surface of the calcium carbide to form a microcapsule plastic expansion agent.

[0099] The preparation method of the micro-expansion high-strength offshore wind power grouting material comprises the following steps:

[0100] (1) mixing ultrafine cement, fine aggregate, micro-nano powder and expansion component to prepare powder A;

[0101] (2) mixing and stirring the microcapsule plastic expansion agent and the water reducing agent to obtain powder B;

[0102] (3) Powder A and powder B are mixed and stirred to obtain a slightly expanded high-strength offshore wind power grouting material.

[0103] Comparative Example 1

[0104] The basic steps are the same as those in Example 5, except that no micro-nano powder is added, as shown in Table 11 below.

[0105] Table 11 Raw material composition used in comparative example 1

[0106] raw material Ultrafine cement fine aggregate Expansion components Microcapsule plastic expansion agent Water reducing agent Content / kg 50 45 5 0.05 0.4

[0107] Comparative Example 2

[0108] The basic steps are the same as those in Example 5, except that mineral powder is used instead of micro-nano powder, as shown in Table 11 below.

[0109] Table 11 Raw material composition used in comparative example 1

[0110] raw material Ultrafine cement Mineral powder fine aggregate Expansion components Microcapsule plastic expansion agent Water reducing agent Content / kg 35 15 45 5 0.05 0.4

[0111] Comparative Example 3

[0112] The basic steps are the same as those in Example 5, except that the microcapsule plastic expansion agent uses epoxy resin as the wall material, as shown in Table 13 below.

[0113] The microcapsule plastic expansion agent of this embodiment is prepared by the following steps: the epoxy resin is atomized at a rate of 18-20 mL / min through a spray dryer to form micro droplets as a wall material; calcium carbide is added at a core-to-wall ratio of 1:1.2 so that the atomized epoxy resin is wrapped on the surface of the calcium carbide to form a microcapsule plastic expansion agent.

[0114] Table 13 Raw material composition used in comparative example 3

[0115] raw material Ultrafine cement Micro-nano powder fine aggregate Expansion components Microcapsule plastic expansion agent Water reducing agent Content / kg 35 15 45 5 0.05 0.4

[0116] Performance Testing

[0117] The test results are shown in Table 14 below.

[0118] Table 14 Performance results of micro-expansion high-strength offshore wind power grouting material

[0119]

[0120]

[0121] It can be seen from the table that the initial fluidity of the micro-expansion high-strength offshore wind power grouting material prepared by the present invention is ≥310mm, the fluidity of 30min is ≥290mm, and the fluidity is good; the compressive strength of 1d is ≥85MPa, the compressive strength of 3d is ≥120MPa, and the compressive strength of 28d is ≥140MPa, which has the advantage of ultra-high strength, the vertical expansion rate of 3h is 1.5-2.1%, the difference between the vertical expansion rate of 24h and 3h is 0.12-0.%, and the self-shrinkage of 28d drying is -0.2-0.12%, which is slightly expanded in the early stage and has no shrinkage in the later stage. Compared with the comparative example, it can be found that the addition of micro-nano powder significantly improves the mechanical properties of offshore wind power grouting material. The self-made microcapsule plastic expansion agent of the present invention ensures the micro-expansion of wind power grouting material in the plastic stage, and improves the flexural strength of the grouting material. The vertical expansion rate of 3h and the difference between the vertical expansion rate of 24h and 3h meet the requirements, and the expansion effect is better than that of market products.

Claims

1. A micro-expansion high-strength offshore wind power grouting material, characterized in that: The raw materials include the following by weight: 35-45 parts of ultrafine cement, 35-45 parts of fine aggregate, 10-15 parts of micro-nano powder, 5-10 parts of calcium sulfoaluminate expansion agent, 0.05-0.1 parts of microcapsule plastic expansion agent and 0.4-0.5 parts of water reducing agent; wherein the microcapsule plastic expansion agent is composed of calcium carbide core material and silicone resin wall material with a core-to-wall mass ratio of 1:1.2-1.5; The microcapsule plastic expansion agent is prepared by the following steps: atomizing an organic silicon resin to form micro droplets, adding calcium carbide at a core-to-wall ratio of 1:1.2-1.5 to form a microcapsule plastic expansion agent in which the organic silicon resin encapsulates the calcium carbide; The micro-nano powder is prepared by the following steps: mixing mineral powder, calcium silicate hydrate seed crystals, and triisopropanolamine in a mass ratio of 1: (0.01-0.05): (0.0003-0.0005), homogenizing, and grinding for 3-5 hours to obtain a particle size D 50 Micro-nano powder ≤2μm.

2. The micro-expansion high-strength offshore wind power grouting material according to claim 1 is characterized in that: The grinding bodies during the pulverizing are composed of 4mm, 6mm and 8mm steel micro-balls in a ratio of 3:3:4, with a planetary factor of 6.8-7.2, a ball-to-material ratio of 0.55-0.6, a rotation speed of 800-1000r / min, and a speed ratio of 1:0.5-0.

6.

3. The micro-expansion high-strength offshore wind power grouting material according to claim 1 is characterized in that: The ultrafine cement is P.Ⅱ52.5 ultrafine silicate cement, with a particle size D50≤6μm, a 3d compressive strength≥50MPa, and a 28d compressive strength≥70MPa.

4. The micro-expansion high-strength offshore wind power grouting material according to claim 1 is characterized in that: The fine aggregate is composed of 10-30 mesh quartz sand, 30-55 mesh quartz sand and 55-100 mesh quartz sand in a mass ratio of 1: (0.9-1.2): (0.3-0.5).

5. The micro-expansion high-strength offshore wind power grouting material according to claim 1 is characterized in that: The water reducing agent is a polycarboxylic acid high performance water reducing agent with a water reducing rate of ≥28%.

6. A method for preparing the micro-expansion high-strength offshore wind power grouting material according to claim 1, characterized in that: The steps include: (1) Mixing and stirring ultrafine cement, fine aggregate, micro-nano powder and calcium sulfoaluminate expansion agent to prepare powder A; (2) Mixing and stirring the microcapsule plastic expansion agent and the water reducing agent to obtain powder B; (3) Powder A and powder B are mixed and stirred to obtain a slightly expanded high-strength offshore wind power grouting material.

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