Foundation ring type wind tower foundation repairing and reinforcing material as well as preparation method and application thereof

Abstract

The invention discloses a foundation ring type wind tower foundation repairing and reinforcing material as well as a preparation method and application thereof. The foundation ring type wind tower foundation repairing and reinforcing material comprises the following components in percentage by mass: 40-55% of a cementing material, 1-4% of modified basalt fiber powder, 20-25% of superfine quartz sand, 5-10% of limestone powder, 3-8% of a functional material, 3-10% of an additive and 7-13% of mixing water. The prepared foundation ring type wind tower foundation repairing and reinforcing material has ultrahigh flowability and trafficability during construction, has the advantages of fatigue damage resistance, high cohesiveness, high strength, high trafficability, low viscosity, freezing and thawing resistance and the like after being set and hardened, can be applied to repairing and reinforcing of wind tower joints, and is particularly suitable for repairing and reinforcing of foundation ring type wind tower foundations; the fatigue damage of the foundation ring type wind tower foundation under the reciprocating action of wind power can be effectively solved, and the method has important significance for improving the structural safety and prolonging the service life of a wind tower.

Description

Technical Field

[0001] The present invention belongs to the technical field of building materials and wind power engineering, and in particular, relates to a foundation ring type wind tower foundation repair and reinforcement material and a preparation method and application thereof. Background Art

[0002] As the main load-bearing component of the entire wind turbine, the wind turbine tower will bear complex alternating external loads in most cases. Since the external loads are basically random loads and generate large bending moments at the tower piles, they will cause serious fatigue damage to the wind tower foundation.

[0003] The existing wind tower foundations are mainly divided into base ring foundations and prestressed anchor bolt foundations. Among them, the base ring wind tower foundation is subject to large external fatigue loads, complex environmental conditions, and is difficult to fully vibrate during bottom pouring, which leads to industry pain points and difficulties such as slurry overturning, shear damage, perforated steel bar fracture, and a large number of cracks on the sides of the base ring and the base platform. In response to such problems, patent CN116163349A discloses a foundation reinforcement technology for wind turbines. Although this patent improves the construction quality to a certain extent, the construction method is relatively complicated and requires cleaning and drying of the construction site. The degree of cleaning and internal dryness cannot be guaranteed, and there are many construction procedures and the quality is difficult to guarantee. In addition, when repairing and reinforcing the foundation of the base ring wind tower, the material requirements are also high. The repair and reinforcement materials are required to have high strength, high fatigue resistance, high fluidity, high filling properties, and high durability. At present, there is a lack of such materials. However, the use of general grouting materials will lead to secondary damage in the repair and reinforcement of the base ring wind tower foundation, which significantly reduces the service life and safety of the wind tower foundation. Therefore, it is urgent to develop new base ring wind tower foundation repair and reinforcement materials. Summary of the invention

[0004] In order to solve the above problems, the present invention aims at the current status of the technology and construction technology of foundation repair and reinforcement materials for foundation ring type wind towers, and proposes a foundation ring type wind tower foundation repair and reinforcement material and its preparation method, application and construction method. The purpose is to make the prepared foundation ring type wind tower foundation repair and reinforcement material have ultra-high fluidity, permeability and filling property during construction, and have the advantages of fatigue resistance, waterproofness, high strength, high volume stability, freeze-thaw resistance and salt corrosion resistance after solidification. It can be used for the repair and reinforcement of wind tower joints, and is particularly suitable for the repair and reinforcement of foundation ring type wind tower foundations. It can effectively solve the problems of fatigue damage of the foundation ring type wind tower under the reciprocating action of wind force and complex construction and difficult quality assurance, which is of great significance to improving the safety and life of the wind tower structure.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] In a first aspect, an embodiment of the present invention provides a basic ring-type wind tower foundation repair and reinforcement material, comprising the following components in percentage by mass:

[0007] Cementitious material 40-55%, modified basalt fiber powder 1-4%, ultrafine quartz sand 20-25%, limestone powder 5-10%, functional material 3-8%, admixture 3-10%, mixing water 7-13%.

[0008] In some embodiments, the cementitious material includes the following components in percentage by mass: 75-90% cement, 5-20% nano-silicon dioxide, and 5-15% modified glass microspheres;

[0009] Preferably, the cement is one of P·O42.5 cement and P·O52.5 cement;

[0010] Preferably, the microstructure of the nano-silicon dioxide is spherical, the particle size is less than 100 nm, and the purity is >95%;

[0011] Preferably, the particle size of the modified glass microspheres is 20-200 μm, and the density is >2 g / cm 3 .

[0012] In some embodiments, the modified basalt fiber powder has a diameter of 5 to 9 μm and a length of 50 to 200 μm;

[0013] And / or, the particle size of the ultrafine quartz sand is 200-400 mesh;

[0014] And / or, the particle size of the limestone powder is 70-200 meshes.

[0015] In some embodiments, the functional material includes the following components in percentage by weight: 25-35% sodium silicate, 5-10% sodium methyl silicate, 3-5% calcium methyl silicate, 5-10% sodium sulfate, 10-14% hydroxyethylidene diphosphonic acid, 5-10% calcium hydroxide, 3-7% sodium calcium carbonate, 3-7% sodium sodium carbonate, 3-7% vinyl bisstearamide, 1-5% sodium stearate, 2-6% nanoalumina, 3-8% polyvinyl alcohol, and 2-7% polysiloxane.

[0016] In some embodiments, the admixture includes the following components in percentage by weight: 15-25% polycarboxylate water reducer, 70-85% expansion agent, and 1-5% early strength agent;

[0017] Preferably, the expansion agent is a composite expansion agent of calcium oxide and magnesium oxide;

[0018] Preferably, the early strength agent is lithium carbonate.

[0019] In a second aspect, an embodiment of the present invention further provides a method for preparing a foundation repair and reinforcement material for a basic ring-type wind tower as described in the first aspect, comprising the following steps:

[0020] S1, weigh the cementitious material, modified basalt fiber powder, ultrafine quartz sand, limestone powder, functional material, admixture and mixing water respectively according to proportion;

[0021] S2, after the functional material and the admixture are stirred and mixed, the cementitious material is added and stirred and mixed, then the ultrafine quartz sand and the limestone powder are added and stirred and mixed, and finally the modified basalt fiber powder is added and stirred and mixed to form a dry mixture of the foundation ring wind tower foundation repair and reinforcement material;

[0022] S3, adding the mixing water into the dry mixture of the basic ring-type wind tower foundation repair and reinforcement material, vibrating and stirring, so as to obtain the basic ring-type wind tower foundation repair and reinforcement material.

[0023] In a third aspect, an embodiment of the present invention further proposes an application of the basic ring wind tower foundation repair and reinforcement material as described in the first aspect in repairing and reinforcing a basic ring wind tower foundation, an existing building or an existing structure.

[0024] In a fourth aspect, an embodiment of the present invention further provides a construction method of the foundation ring type wind tower foundation repair and reinforcement material as described in the first aspect, comprising the following steps:

[0025] (1) continuously pouring a repair and reinforcement material into the construction site to be repaired and reinforced until it is full; the repair and reinforcement material is the foundation ring wind tower foundation repair and reinforcement material described in the first aspect;

[0026] (2) At regular intervals, add repair and reinforcement materials to the construction site where the repair and reinforcement materials have been poured until the repair and reinforcement materials at the construction site no longer settle;

[0027] (3) The construction site where the repair and reinforcement materials are poured is smoothed and finished, and maintenance begins after final setting.

[0028] In some embodiments, the step (1) also includes pre-treating the construction site to be repaired and reinforced before pouring, and the pre-treatment process is: pouring water into the construction site to be repaired and reinforced, soaking for 4 to 8 hours, extracting the water, and then blowing with high-pressure hot air until there is no visible water at the air outlet, and then pouring the foundation ring wind tower foundation repair and reinforcement materials; or directly using high-pressure air to blow until there is no obvious dust at the air outlet of the construction site to be repaired and reinforced, and then pouring the foundation ring wind tower foundation repair and reinforcement materials.

[0029] In some embodiments, in step (1), the perfusion method includes any of the following methods:

[0030] Using a conduit to guide the foundation ring wind tower foundation repair and reinforcement material to the construction site to be repaired and reinforced, and using gravity to naturally pour;

[0031] Or use a spiral conveying tube for perfusion;

[0032] Or use pressure pump for pressure infusion;

[0033] Or manual filling.

[0034] The advantages and beneficial effects of the embodiments of the present invention are as follows:

[0035] (1) The base ring wind tower foundation repair and reinforcement material prepared in the embodiment of the present invention has high fatigue resistance. Compared with other materials of the same type, when the stress ratio is 0.7, the number of stress cycles of the base ring wind tower foundation repair and reinforcement material prepared in the embodiment of the present invention is increased by more than 40%.

[0036] (2) The base ring wind tower foundation repair and reinforcement material prepared in the embodiment of the present invention has an ultra-low viscosity. Compared with other materials of the same type, at the same fluidity, the viscosity of the base ring wind tower foundation repair and reinforcement material prepared in the embodiment of the present invention is reduced by more than 30%.

[0037] (3) The foundation ring wind tower foundation repair and reinforcement material prepared in the embodiment of the present invention has high permeability and permeability, and can be grouted through a thin conduit under its own weight, and can effectively repair and fill "broken holes" and micro cracks.

[0038] (4) The base ring wind tower foundation repair and reinforcement material prepared in the embodiment of the present invention has high adhesion, which effectively solves the engineering problem of being unable to perform pre-treatment such as effective cleaning / clearing inside the base ring wind tower foundation during the repair and reinforcement. At the same time, the repair and reinforcement material prepared in the embodiment of the present invention can adapt to a variety of pouring methods, is simple to construct, and has high efficiency. It is particularly suitable for wind tower repair and reinforcement in scenarios such as inconvenient outdoor transportation and harsh environments.

[0039] (5) The foundation ring wind tower foundation repair and reinforcement material prepared in the embodiment of the present invention has high durability because of its dense internal filling, high bonding performance and strong fatigue resistance. On the one hand, it is not easily corroded by external media and ions, and on the other hand, it has high durability itself, which can effectively improve the use effect of the wind tower after repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the passability test of the foundation repair and reinforcement material of the basic ring type wind tower according to an embodiment of the present invention.

[0041] Figure 2 It is a schematic diagram of a fatigue resistance test of a foundation repair and reinforcement material for a ring-type wind tower according to an embodiment of the present invention.

[0042] Figure 3 This is a schematic diagram of the surface state of the basic ring wind tower foundation repair and reinforcement material prepared in Example 1 of the present invention after 350 freeze-thaw cycles.

[0043] Figure 4 This is a schematic diagram of the surface state of the C80 repair and reinforcement grouting material sold by a manufacturer in 2024 after 350 freeze-thaw cycles in comparative example 1. DETAILED DESCRIPTION

[0044] Embodiments of the present invention are described in detail below. The embodiments are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0045] Where values ​​are described herein as a range, it should be understood that such disclosure includes disclosure of all possible sub-ranges within that range, as well as specific values ​​falling within that range, regardless of whether a specific value or a specific sub-range is explicitly stated.

[0046] Herein, the words "comprises" and "includes" and variations thereof mean that other elements or integers which are permitted but not specifically described may be included.

[0047] In this article, the term "and / or" is merely a term used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0048] In a first aspect, an embodiment of the present invention provides a basic ring-type wind tower foundation repair and reinforcement material, comprising the following components in percentage by mass:

[0049] Cementitious material 40-55%, modified basalt fiber powder 1-4%, ultrafine quartz sand 20-25%, limestone powder 5-10%, functional material 3-8%, admixture 3-10%, mixing water 7-13%.

[0050] The functional mechanism of the foundation ring type wind tower foundation repair and reinforcement material proposed in the embodiment of the present invention is as follows:

[0051] High fatigue resistance: Since the fatigue failure strength is much lower than the strength limit of cement-based materials, the foundation ring foundation is very prone to fatigue failure under variable reciprocating loads. In order to improve the fatigue resistance of cement-based materials, short-cut fibers are often added to cement-based materials in engineering. Common short-cut fibers include steel fibers, carbon fibers, basalt fibers, polypropylene fibers, polyvinyl alcohol fibers, etc., but these short-cut fibers are too long, which has a great impact on the workability and passability of cement-based materials. The repair and reinforcement effect is poor after adding, and secondary damage will occur in a short time. To this end, the embodiment of the present invention adds basalt fiber powder to the repair and reinforcement material from the perspective of the microstructure and mechanical principles of the repair and reinforcement material, and optimizes the parameters and dosage of the basalt fiber powder to improve the fatigue resistance of the repair and reinforcement material. The mechanism of using basalt fiber powder in the embodiment of the present invention is as follows: 1) In order to improve the permeability and fluidity of the repair and reinforcement material, the component particle size of the material should be small and without coarse particles. When subjected to force, long fibers do not need to bypass coarse particles to play a bridging role. From the perspective of microstructure and mechanical principles, for the repair and reinforcement material in the embodiment of the present invention, the optimized basalt fiber powder (too long affects workability, too short has no significant effect on improving fatigue resistance) can be used to improve the overall fatigue resistance of the repair and reinforcement material through the stretching and debonding of basalt fibers on both sides of the crack; 2) The density of steel fiber is too large, and it is easy to sink to the bottom when used, which is not conducive to the homogeneity of the repair and reinforcement material and is not conducive to stirring and construction. At the same time, steel fiber is also easy to rust and form rust on the surface, which is not conducive to the durability and apparent quality of the repair and reinforcement material; while organic fiber is easy to age in harsh environments; in contrast, basalt fiber has good mechanical properties and physical properties, which are confirmed by calculation and experiment to meet the requirements of repair and reinforcement materials. Therefore, the embodiment of the present invention selected basalt fiber powder after theoretical calculation analysis and a large number of experimental comparisons.

[0052] High permeability / filling property: After the foundation ring foundation is destroyed, the internal space structure is complex, and the holes and cracks are uneven in size. Even if traditional pressure grouting is used, for non-connected holes such as "broken holes", it is found that the filling effect is not good after partial demolition in actual projects, and there are still many holes. Therefore, to achieve high permeability / filling property, high requirements are placed on the construction process and the performance of repair and reinforcement materials. The repair and reinforcement materials are required to have high fluidity (to be able to "flow") and low viscosity (to improve permeability and air discharge). However, the amount of fine components in repair and reinforcement materials is large, the water-cement ratio is low, and the material viscosity is high. Therefore, how to reduce the viscosity of such materials has always been a difficult problem for repair and reinforcement materials. To this end, the implementation mechanism of the embodiment of the present invention is as follows: 1) Optimize the particle shape of each component of the repair and reinforcement material, mainly spherical, so as to reduce the movement resistance of the microstructure during the construction of the repair and reinforcement material; 2) Based on the material accumulation theory, calculate the particle size combination of the repair and reinforcement material to reduce the internal friction resistance of the slurry (i.e., the repair and reinforcement material) during movement; 3) Optimize the viscosity reducer to reduce the cohesion between the components during the movement of the slurry from a microscopic perspective, thereby reducing the viscosity of the material: 4) Through experiments and theoretical calculations, the specifications of the basalt fiber powder are optimized to ensure that the anti-fatigue performance can be improved without affecting the fluidity and viscosity of the repair and reinforcement material.

[0053] High adhesion: As a repair and reinforcement material, the adhesion with the original structure directly determines the repair and reinforcement effect. One of the difficulties in the repair and reinforcement of the foundation ring foundation is that it is impossible to clean and pre-treat the repair surface. The current pre-water cleaning, high-pressure blowing and other treatment methods cannot check and guarantee the quality of pre-treatment. To this end, the mechanism of high adhesion achieved by the embodiment of the present invention is as follows: 1) The repair and reinforcement material of the embodiment of the present invention has high passability, filling and ultra-low viscosity, good exhaust performance, and greatly increases the direct contact area between the slurry and the repair surface; 2) The repair and reinforcement material of the embodiment of the present invention has high permeability, and can also fill fine cracks, increasing the connection with the original contact surface; 3) The repair and reinforcement material of the embodiment of the present invention adds a permeability enhancement component to further improve the bonding strength; 4) The repair and reinforcement material of the embodiment of the present invention has a micro-expansion effect, and the microscopic embedding effect generated by the micro-expansion realizes the "prestress" effect at the microscopic level; 5) The repair and reinforcement material of the embodiment of the present invention has high strength itself, which is the basis for high adhesion.

[0054] High durability: The environment in which wind towers are located is generally harsh and complex, especially in saline-alkali areas. In order to increase the life of the wind tower foundation after repair and reduce the risk of secondary damage, the durability of the repair and reinforcement materials is required to be high. The mechanism of high durability achieved by the embodiment of the present invention is as follows: 1) The repair and reinforcement materials of the embodiment of the present invention have high strength and strong corrosion resistance, so they have good durability; 2) The repair and reinforcement materials of the embodiment of the present invention have high fatigue damage resistance, which greatly reduces the secondary durability damage caused by fatigue damage; 3) The repair and reinforcement materials of the embodiment of the present invention themselves have high filling properties. After repair and reinforcement, the internal filling of the foundation ring foundation is dense, and external corrosive media and ions are not easy to enter the interior, reducing the risk of erosion damage; 4) In the embodiment of the present invention, hydrophobic components are added to the components of the repair and reinforcement materials, and the types and dosages of hydrophobic components are optimized through experiments (hydrophobic components have the risk of reducing the adhesion and strength of the material, so a large number of experiments and optimization are required), which further improves the freeze-thaw resistance of the repair and reinforcement materials.

[0055] In some embodiments, the cementitious material includes the following components in percentage by mass: 75-90% cement, 5-20% nano-silicon dioxide, and 5-15% modified glass microspheres;

[0056] Preferably, the cement is one of P·O42.5 cement and P·O52.5 cement;

[0057] Preferably, the microstructure of the nano-silicon dioxide is spherical, the particle size is less than 100 nm, and the purity is >95%;

[0058] Preferably, the particle size of the modified glass microspheres is 20-200 μm, and the density is >2 g / cm 3 Ordinary glass microspheres are mostly hollow glass microspheres, with a density of 0.2 to 1.5 g / cm 3 , which is less than the slurry density during mixing (usually 2.1-2.4 g / cm 3 ), which is easy to float on the surface of the slurry and has a poor use effect. Therefore, in the embodiment of the present invention, modified glass microspheres are used to make their density close to the slurry density, so as to obtain better homogeneity.

[0059] In some embodiments, the modified basalt fiber powder has a diameter of 5 to 9 μm and a length of 50 to 200 μm. Since the foundation ring wind tower foundation repair and reinforcement material requires high fatigue resistance, high workability and high passability, the fiber must be optimized. The conventional steel fiber density is 7.85 g / cm 3 The density of organic fibers (such as polypropylene fibers, polyvinyl alcohol fibers, polyethylene fibers, etc.) is generally less than 1g / cm 3 , while the density of basalt fiber is generally 2-3g / cm 3, and the density of the slurry after mixing (usually 2.1-2.4 g / cm 3 ), so it is easiest to obtain better homogeneity by using basalt fiber; and in order to improve the fatigue resistance of the repair and reinforcement materials, it is necessary to further study the length and diameter of basalt fibers. Based on the fracture mechanics and fatigue damage theory of cement-based materials, the cracking process and fatigue failure process of the materials are simulated, and the diameter and length of basalt fibers are calculated and optimized to achieve the best bridging effect of basalt fibers between cracks; based on the theoretically calculated basalt fiber length range, material mixing experiments are conducted to further optimize the basalt fiber parameters, so that the prepared repair and reinforcement materials meet the requirements of high workability and high passability; in addition, compared with steel fibers and organic fibers, basalt fibers have higher tensile strength and durability;

[0060] And / or, the particle size of the ultrafine quartz sand is 200-400 mesh;

[0061] And / or, the particle size of the limestone powder is 70-200 meshes.

[0062] On the one hand, the embodiment of the present invention calculates the dosage of each component through the stacking theory, so that the three main components of cementitious material, quartz sand, and limestone powder form an optimal combination in particle size grading to achieve a good filling effect; on the other hand, in the microstructure, the three main components of cementitious material, quartz sand, and limestone powder are spherical, forming a ball effect, which can achieve good fluidity; in addition, in addition to the filling effect, the limestone powder can also provide a "calcium source" for the hardening process of the repair and reinforcement material.

[0063] In some embodiments, the functional material includes the following components in percentage by weight: 25-35% sodium silicate, 5-10% sodium methyl silicate, 3-5% calcium methyl silicate, 5-10% sodium sulfate, 10-14% hydroxyethylidene diphosphonic acid, 5-10% calcium hydroxide, 3-7% sodium calcium carbonate, 3-7% sodium sodium carbonate, 3-7% vinyl bisstearamide, 1-5% sodium stearate, 2-6% nanoalumina, 3-8% polyvinyl alcohol, and 2-7% polysiloxane.

[0064] The embodiment of the present invention optimizes the composition of the functional material and the dosage of each component to avoid the mutual influence between the components of the functional material and the influence on other overall properties of the repair and reinforcement material. The functional material mainly plays the following roles: 1) strengthening the internal density of the repair and reinforcement material; 2) increasing the penetration enhancement effect on the existing structure and microcracks to improve the interface bonding effect; 3) reducing the viscosity of the repair and reinforcement material after mixing by changing the intermolecular force; 4) improving the dispersibility of the repair and reinforcement material; 5) improving the waterproof performance of the hardened repair and reinforcement material.

[0065] In some embodiments, the admixture includes the following components in percentage by weight: 15-25% polycarboxylate water reducer, 70-85% expansion agent, and 1-5% early strength agent;

[0066] Preferably, the expansion agent is a composite expansion agent of calcium oxide and magnesium oxide; the composite expansion agent is usually made of dolomite as raw material, which is calcined at 1100-1300°C for 60-120 minutes to obtain a mixture of magnesium oxide and calcium oxide; based on the net content per 100 parts by weight, the mixture generally should contain 30-40 parts of magnesium oxide and 45-60 parts of calcium oxide, and the mixture is ground into a finished expansion agent; the composite expansion agent can be directly purchased commercially; by adding the composite expansion agent, the repair and reinforcement material can be slightly expanded, and "prestress" can be generated in the microscopic local area, further improving the stress-bearing performance of the repair and reinforcement material;

[0067] Preferably, the early strength agent is lithium carbonate; by introducing the early strength agent, the strength of the repair and reinforcement material can be rapidly increased after final setting, thereby avoiding the risk of damage caused by external loads when the strength of the repair and reinforcement material is low during maintenance.

[0068] In a second aspect, an embodiment of the present invention further provides a method for preparing a foundation repair and reinforcement material for a basic ring-type wind tower as described in the first aspect, comprising the following steps:

[0069] S1, weigh the cementitious material, modified basalt fiber powder, ultrafine quartz sand, limestone powder, functional material, admixture and mixing water respectively according to proportion;

[0070] S2, after the functional material and the admixture are stirred and mixed, the cementitious material is added and stirred and mixed, then the ultrafine quartz sand and the limestone powder are added and stirred and mixed, and finally the modified basalt fiber powder is added and stirred and mixed to form a dry mixture of the foundation ring wind tower foundation repair and reinforcement material;

[0071] S3, adding the mixing water into the dry mixture of the basic ring-type wind tower foundation repair and reinforcement material, vibrating and stirring, so as to obtain the basic ring-type wind tower foundation repair and reinforcement material.

[0072] In a third aspect, an embodiment of the present invention further proposes an application of the basic ring wind tower foundation repair and reinforcement material as described in the first aspect in repairing and reinforcing a basic ring wind tower foundation, an existing building or an existing structure.

[0073] In a fourth aspect, an embodiment of the present invention further provides a construction method of the foundation ring type wind tower foundation repair and reinforcement material as described in the first aspect, comprising the following steps:

[0074] (1) continuously pouring a repair and reinforcement material into the construction site to be repaired and reinforced until it is full; the repair and reinforcement material is the foundation ring wind tower foundation repair and reinforcement material described in the first aspect;

[0075] (2) After being filled, the repair and reinforcement material slurry will naturally settle. Therefore, at regular intervals (such as 20 minutes), the repair and reinforcement material is added to the construction site where the repair and reinforcement material has been poured until the repair and reinforcement material at the construction site no longer settles.

[0076] (3) The construction site where the repair and reinforcement materials are poured is smoothed and finished, and maintenance begins after final setting.

[0077] In some embodiments, the step (1) also includes pre-treating the construction site to be repaired and reinforced before pouring, and the pre-treatment process is: pouring water into the construction site to be repaired and reinforced, soaking for 4 to 8 hours, extracting the water, and then blowing with high-pressure hot air until there is no visible water at the air outlet, and then pouring the foundation ring wind tower foundation repair and reinforcement materials; or directly using high-pressure air to blow until there is no obvious dust at the air outlet of the construction site to be repaired and reinforced, and then pouring the foundation ring wind tower foundation repair and reinforcement materials.

[0078] In some embodiments, in step (1), the perfusion method includes any of the following methods:

[0079] Using a conduit to guide the foundation ring wind tower foundation repair and reinforcement material to the construction site to be repaired and reinforced, and using gravity to naturally pour;

[0080] Or use a spiral conveying tube for perfusion;

[0081] Or use pressure pump for pressure infusion;

[0082] Or manual filling.

[0083] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments. Various raw materials used in the embodiments are conventional commercially available products or can be prepared by known methods.

[0084] Example 1

[0085] A basic ring type wind tower foundation repair and reinforcement material comprises the following components in percentage by mass:

[0086] Cementitious material 45%, modified basalt fiber powder 3%, ultrafine quartz sand 23%, limestone powder 6%, functional material 7%, admixture 8%, mixing water 8%.

[0087] The cementitious material includes: 75% of P·O42.5 cement, 15% of nano-silicon dioxide and 10% of modified glass microspheres, calculated by mass percentage;

[0088] Functional materials include: 30% sodium silicate, 6% sodium methyl silicate, 4% calcium methyl silicate, 7% sodium sulfate, 12% hydroxyethylidene diphosphonic acid, 8% calcium hydroxide, 6% sodium calcium carbonate, 6% sodium carbonate, 4% vinyl bisstearamide, 5% sodium stearate, 3% nanoalumina, 3% polyvinyl alcohol and 6% polysiloxane, calculated by mass percentage;

[0089] The admixtures include: 20% of polycarboxylic acid water-reducing agent, 77% of expansion agent (composite of calcium oxide and magnesium oxide) and 3% of early strength agent (lithium carbonate), calculated by mass percentage.

[0090] Example 2

[0091] A basic ring type wind tower foundation repair and reinforcement material comprises the following components in percentage by mass:

[0092] Cementitious material 50%, modified basalt fiber powder 4%, ultrafine quartz sand 21%, limestone powder 5%, functional material 6%, admixture 5%, mixing water 9%.

[0093] The cementitious material includes: 80% of P·O52.5 cement, 10% of nano-silicon dioxide and 10% of modified glass microspheres, calculated by mass percentage;

[0094] Functional materials include: 35% sodium silicate, 5% sodium methyl silicate, 3% calcium methyl silicate, 5% sodium sulfate, 10% hydroxyethylidene diphosphonic acid, 9% calcium hydroxide, 5% sodium calcium carbonate, 7% sodium carbonate, 6% vinyl bisstearamide, 3% sodium stearate, 3% nanoalumina, 4% polyvinyl alcohol and 5% polysiloxane, calculated by mass percentage;

[0095] The admixtures include: 20% of polycarboxylic acid water-reducing agent, 77% of expansion agent (composite of calcium oxide and magnesium oxide) and 3% of early strength agent (lithium carbonate), calculated by mass percentage.

[0096] Example 3

[0097] A basic ring type wind tower foundation repair and reinforcement material comprises the following components in percentage by mass:

[0098] Cementitious material 55%, modified basalt fiber powder 1%, ultrafine quartz sand 20%, limestone powder 5%, functional material 3%, admixture 6%, mixing water 10%.

[0099] The cementitious materials include: 90% of P·O42.5 cement, 5% of nano-silicon dioxide and 5% of modified glass microspheres, calculated by mass percentage;

[0100] Functional materials include: 25% sodium silicate, 9% sodium methyl silicate, 5% calcium methyl silicate, 8% sodium sulfate, 14% hydroxyethylidene diphosphonic acid, 5% calcium hydroxide, 3% sodium calcium carbonate, 4% sodium carbonate, 5% vinyl bisstearamide, 2% sodium stearate, 6% nanoalumina, 7% polyvinyl alcohol and 7% polysiloxane, calculated by mass percentage;

[0101] The admixtures include: 25% of polycarboxylic acid water-reducing agent, 74% of expansion agent (composite of calcium oxide and magnesium oxide) and 1% of early strength agent (lithium carbonate), calculated by mass percentage.

[0102] In order to evaluate the performance of the basic ring wind tower foundation repair and reinforcement materials prepared in the embodiments of the present invention, the basic ring wind tower foundation repair and reinforcement materials prepared in the above embodiments 1-3 were subjected to compressive strength tests, bonding strength tests and frost resistance tests respectively with reference to JGJ70-2009 "Basic Performance Test Methods for Building Mortar". Among them, the pre-treatment bonding strength refers to pre-wetting the old concrete blocks for 4 hours before pouring the slurry, taking out the old concrete blocks and wiping the surface, and then pouring the slurry. At the same time, a conduit with a diameter of 3mm connected to the bottom of the funnel is used to test the passability (such as Figure 1 The fatigue resistance was tested by straight pull test of 150mm×50mm×10mm plate (as shown). Figure 2 The test results are shown in Table 1.

[0103] Table 1

[0104]

[0105]

[0106] It can be seen from Table 1 that compared with the C80 repair and reinforcement grouting material sold by a certain manufacturer in 2024 in the comparative example, the base ring wind tower foundation repair and reinforcement material prepared in the embodiment of the present invention performs better in fatigue resistance, viscosity, passability, and adhesion. In particular, when the old concrete is not pretreated, the repair and reinforcement material prepared in the embodiment of the present invention still exhibits relatively high bonding performance, which solves the engineering problem of difficult pretreatment of the interior of the base ring wind tower foundation, greatly reduces the construction difficulty, improves the construction quality and construction effect, and the benefits are very significant.

[0107] The frost resistance of the foundation ring wind tower foundation repair and reinforcement material prepared in Example 1 of the present invention and the C80 repair and reinforcement grouting material sold by a manufacturer in 2024 in Comparative Example 1 were tested. The surface conditions after 350 freeze-thaw cycles were as follows: Figure 3 and Figure 4As shown, it can be seen that compared with the C80 repair and reinforcement grouting material in Comparative Example 1, the repair and reinforcement material prepared in Example 1 of the present invention exhibits better antifreeze performance.

[0108] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0109] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A foundation ring wind tower foundation repair and reinforcement material, characterized in that: The following components are included in percentage by mass: Cementitious material 40-55%, modified basalt fiber powder 1-4%, ultrafine quartz sand 20-25%, limestone powder 5-10%, functional material 3-8%, admixture 3-10%, mixing water 7-13%.

2. The base ring wind tower foundation repair and reinforcement material according to claim 1 is characterized in that: The cementitious material comprises the following components in percentage by weight: 75-90% cement, 5-20% nano-silicon dioxide, and 5-15% modified glass microspheres; Preferably, the cement is one of P·O42.5 cement and P·O52.5 cement; Preferably, the microstructure of the nano-silicon dioxide is spherical, the particle size is less than 100 nm, and the purity is >95%; Preferably, the particle size of the modified glass microspheres is 20-200 μm, and the density is >2 g / cm 3 .

3. The base ring type wind tower foundation repair and reinforcement material according to claim 1 is characterized in that: The modified basalt fiber powder has a diameter of 5 to 9 μm and a length of 50 to 200 μm; And / or, the particle size of the ultrafine quartz sand is 200-400 mesh; And / or, the particle size of the limestone powder is 70-200 meshes.

4. The base ring wind tower foundation repair and reinforcement material according to claim 1 is characterized in that: The functional material comprises the following components in percentage by mass: 25-35% sodium silicate, 5-10% sodium methyl silicate, 3-5% calcium methyl silicate, 5-10% sodium sulfate, 10-14% hydroxyethylidene diphosphonic acid, 5-10% calcium hydroxide, 3-7% sodium calcium carbonate, 3-7% sodium sodium carbonate, 3-7% vinyl bisstearamide, 1-5% sodium stearate, 2-6% nanoalumina, 3-8% polyvinyl alcohol and 2-7% polysiloxane.

5. The base ring type wind tower foundation repair and reinforcement material according to claim 1 is characterized in that: The admixture includes the following components in percentage by weight: 15-25% polycarboxylate water reducer, 70-85% expansion agent, and 1-5% early strength agent; Preferably, the expansion agent is a composite expansion agent of calcium oxide and magnesium oxide; Preferably, the early strength agent is lithium carbonate.

6. A method for preparing the base ring wind tower foundation repair and reinforcement material according to any one of claims 1 to 5, characterized in that: The steps include: S1, weigh the cementitious material, modified basalt fiber powder, ultrafine quartz sand, limestone powder, functional material, admixture and mixing water respectively according to proportion; S2, after the functional material and the admixture are stirred and mixed, the cementitious material is added and stirred and mixed, then the ultrafine quartz sand and the limestone powder are added and stirred and mixed, and finally the modified basalt fiber powder is added and stirred and mixed to form a dry mixture of the foundation ring wind tower foundation repair and reinforcement material; S3, adding the mixing water into the dry mixture of the basic ring-type wind tower foundation repair and reinforcement material, vibrating and stirring, so as to obtain the basic ring-type wind tower foundation repair and reinforcement material.

7. Use of the base ring wind tower foundation repair and reinforcement material as claimed in any one of claims 1 to 5 in repairing and reinforcing the base ring wind tower foundation, existing buildings or existing structures.

8. A construction method for the foundation repair and reinforcement material of a base ring type wind tower as claimed in any one of claims 1 to 5, characterized in that: The steps include: (1) continuously pouring a repair and reinforcement material into the construction site to be repaired and reinforced until it is full; the repair and reinforcement material is the foundation ring wind tower foundation repair and reinforcement material as described in any one of claims 1 to 5; (2) At regular intervals, add repair and reinforcement materials to the construction site where the repair and reinforcement materials have been poured until the repair and reinforcement materials at the construction site no longer settle; (3) The construction site where the repair and reinforcement materials are poured is smoothed and finished, and maintenance begins after final setting.

9. The construction method of the foundation ring type wind tower foundation repair and reinforcement material according to claim 8 is characterized in that: The step (1) also includes pre-treating the construction site to be repaired and reinforced before pouring, and the pre-treatment process is: pouring water into the construction site to be repaired and reinforced, soaking for 4 to 8 hours, extracting the water, and then blowing with high-pressure hot air until there is no visible water at the air outlet, and then pouring the foundation ring wind tower foundation repair and reinforcement materials; or directly using high-pressure air to blow until there is no obvious dust at the air outlet of the construction site to be repaired and reinforced, and then pouring the foundation ring wind tower foundation repair and reinforcement materials.

10. The construction method of the foundation ring type wind tower foundation repair and reinforcement material according to claim 8, characterized in that: In step (1), the method of perfusion includes any of the following methods: Using a conduit to guide the foundation ring wind tower foundation repair and reinforcement material to the construction site to be repaired and reinforced, and using gravity to naturally pour; Or use a spiral conveying tube for perfusion; Or use pressure pump for pressure infusion; Or manual filling.

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