Mortar based on retired fan blade recycled material and preparation method thereof

Abstract

The invention relates to the technical field of building materials, and provides mortar based on a retired fan blade recycled material and a preparation method of the mortar. The mortar based on the retired fan blade recycled material comprises a cementing material, fine aggregate, recycled glass fibers, a water reducing agent and water, wherein the fine aggregate comprises retired fan blade regenerated powder, and the particle size of the retired fan blade regenerated powder is smaller than or equal to 0.315 mm; the width of the regenerated glass fiber is larger than 0.315 mm, and the length of the regenerated glass fiber According to the mortar based on the decommissioned fan blade recycled material, by means of the synergistic effect of the decommissioned fan blade recycled powder with the specific particle size, the recycled glass fiber with the specific size and other components, the comprehensive performance of the mortar is remarkably improved, and therefore high-valued application of the decommissioned fan blade recycled material is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of solid waste resource utilization, and particularly relates to a mortar based on a regenerated material of a retired wind turbine blade and a preparation method thereof. BACKGROUND

[0002] With the rapid development of the global wind power industry, the problem of large-scale retirement of wind turbine blades is increasingly prominent. Wind turbine blades are mainly composed of glass fiber or carbon fiber reinforced thermosetting resin-based composite materials, and their chemical cross-linking structure makes it difficult to realize resource utilization through traditional recycling techniques. At present, about 1 million tons of retired blades are added every year worldwide, and it is estimated that the cumulative amount will reach 43 million tons by 2050. Traditional landfill and incineration treatment methods are strictly limited due to environmental pollution, resource waste and other problems. Therefore, developing a recycling technology for retired blades with high value and large-scale characteristics has become a research and development hotspot that needs to be broken through in the industry.

[0003] In recent years, researches at home and abroad mainly focus on chemical dissolution, pyrolysis, physical crushing and other directions for the recycling of retired wind turbine blades, but all kinds of technologies have obvious limitations: pyrolysis can decompose resin and recover fibers at high temperature, but the high energy consumption caused by high-temperature process is a problem; chemical dissolution can achieve recycling by selectively degrading resin with solvents, but it faces the problems of high reagent cost and difficulty in precise control of processing conditions. Compared with the above methods, mechanical grinding as a direct and economical physical recycling scheme can convert blades into fibers and powders through cutting and crushing, but this method will cause serious damage to the fibers, resulting in a significant decrease in their performance, which further restricts the high-value application of building materials prepared therefrom. SUMMARY

[0004] The purpose of the present application is to provide a mortar based on a regenerated material of a retired wind turbine blade and a preparation method thereof, aiming to improve the high-value application of the regenerated material of the retired wind turbine blade.

[0005] To achieve the above-mentioned application purposes, the technical solutions adopted by the present application are as follows:

[0006] In a first aspect, the present application provides a mortar based on a regenerated material of a retired wind turbine blade, which comprises the following raw material components by weight:

[0007]

[0008] The fine aggregate comprises a regenerated powder of a retired wind turbine blade, and the particle size of the regenerated powder of the retired wind turbine blade is less than or equal to 0.315 mm.

[0009] The regenerated glass fiber comprises regenerated glass fiber obtained after recycling treatment of the retired wind turbine blade, and the width of the regenerated glass fiber is greater than 0.315 mm and the length is greater than 5 mm.

[0010] In a second aspect, the application provides a preparation method of the mortar based on the retired wind turbine blade recycled material, comprising the following steps:

[0011] retrieving the retired wind turbine blade recycled powder and the retired wind turbine blade recycled glass fiber from the retired wind turbine blade, wherein the particle size of the retired wind turbine blade recycled powder is less than or equal to 0.315 mm, the width of the retired wind turbine blade recycled glass fiber is greater than 0.315 mm, and the length of the retired wind turbine blade recycled glass fiber is greater than 5 mm;

[0012] mixing 150-170 parts of the fine aggregate including the retired wind turbine blade recycled powder, 2-6 parts of the recycled glass fiber including the retired wind turbine blade recycled glass fiber, 100 parts of the cementing material, 0.8-1.2 parts of the water reducing agent, and 32-40 parts of water to obtain the mortar based on the retired wind turbine blade recycled material.

[0013] The mortar based on the retired wind turbine blade recycled material provided by the first aspect of the application contains the cementing material, the fine aggregate, the recycled glass fiber, the water reducing agent, and water in specific mass fractions. By regulating the size of the recycled glass fiber, the width of the recycled glass fiber is limited to be greater than 0.315 mm and the length of the recycled glass fiber is limited to be greater than 5 mm. The size advantage of the recycled glass fiber can enhance the mechanical interlocking force between the recycled glass fiber and the mortar matrix (composed of the cementing material, the fine aggregate, etc.), optimize the interface transition zone structure of the recycled glass fiber and the mortar matrix, and make the bridging and constraint effects of the recycled glass fiber fully play. The mortar can maintain integrity under large deformation and significantly improve the crack resistance and toughness. Meanwhile, the relatively uniformly distributed recycled glass fiber forms a "circular constraint" on the matrix through interface bonding, which can limit the excessive expansion of the matrix, making it more difficult for the mortar to be brittlely damaged under stress, and thus improving the compressive strength and flexural bearing capacity of the mortar. In addition, the retired wind turbine blade recycled powder with a particle size of less than or equal to 0.315 mm is mixed in the fine aggregate, which has two effects. On the one hand, it can effectively fill the gaps between the fine aggregate particles, improve the internal structure density of the mortar, and thus enhance the overall strength. On the other hand, it can fill the micro gaps in the interface transition zone, cooperate with the water reducing agent to reduce the interface bubbles, significantly improve the density and bonding strength of the transition zone, and thus enhance the compressive and tensile capacity of the mortar. Based on this, the retired wind turbine blade recycled powder with the specific particle size, the recycled glass fiber with the specific size, and other components can significantly improve the comprehensive performance of the mortar through synergistic effect, thereby realizing the high-value application of the retired blade recycled material.

[0014] The preparation method of the mortar based on the retired wind turbine blade recycled material provided by the second aspect of the application can prepare the mortar based on the retired wind turbine blade recycled material by mixing the raw materials of the components, which is simple, convenient, easy to operate, and conducive to wide use. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 is a schematic diagram of compressive strength test provided by the embodiments of the present application;

[0017] Figure 2 is a schematic diagram of flexural strength test provided by the embodiments of the present application;

[0018] Figure 3 is a schematic diagram of tensile property test provided by the embodiments of the present application. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clear, the present application will be further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0020] In the present application, the term "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. Wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0021] In the present application, "at least one" means one or more, and "multiple" means two or more. "At least one" or similar expressions mean any combination of these items, including any combination of single item or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can mean a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, wherein a, b, and c can be single or multiple.

[0022] It should be understood that in various embodiments of the present application, the size of the sequence number of the above processes does not mean the order of execution, and part or all of the steps can be executed in parallel or in sequence. The execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0023] The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the description of the embodiments of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0024] The weight of the related components mentioned in the embodiments of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of each component. Therefore, as long as the content of the related components in the embodiments of the present application is proportionally enlarged or reduced, it is within the scope disclosed in the embodiments of the present application. Specifically, the mass mentioned in the embodiments of the present application can be μg, mg, g, kg, and other mass units commonly known in the chemical field.

[0025] The terms "first", "second", etc. are only used for descriptive purposes and are used to distinguish one object from another, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX can also be referred to as the second XX, and similarly, the second XX can also be referred to as the first XX. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features.

[0026] The term "RWTB" is an abbreviation of "Recycled Wind Turbine Blade Powder", which means recycled wind turbine blade powder, refers to the composite material powder recovered from the retired wind turbine blades through physical crushing, screening and other processes, and the main components are thermosetting resin matrix and glass fiber debris.

[0027] The term "GFRP" is an abbreviation of "Glass Fiber Reinforced Plastic", which means recycled glass fiber (also known as glass steel), which is the core structural material of the retired wind turbine blades.

[0028] The term "LCA" is an abbreviation of "Life Cycle Assessment", which means life cycle assessment. Life cycle assessment is a methodology for assessing the potential environmental impact of a product, process or service throughout its entire life cycle, including raw material acquisition, production, use, and disposal.

[0029] The term "water-binder ratio" refers to the mass ratio of the amount of water to the total amount of cementitious materials in the mortar.

[0030] The first aspect of the embodiments of the present application provides a mortar based on recycled materials of retired wind turbine blades, which comprises the following raw material components by weight:

[0031]

[0032] The fine aggregate comprises a retired wind turbine blade regenerated powder, and the particle size of the retired wind turbine blade regenerated powder is less than or equal to 0.315 mm.

[0033] The recycled glass fiber comprises recycled glass fiber obtained after recycling treatment of the retired wind turbine blade, and the width of the recycled glass fiber is greater than 0.315 mm and the length is greater than 5 mm.

[0034] The mortar based on the retired wind turbine blade regenerated material provided by the embodiment of the application comprises cementitious materials, fine aggregates, recycled glass fibers, water reducing agents and water in specific mass fractions. Through the synergistic effect between the raw material components, the comprehensive performance of the mortar is significantly improved, and the high-value application of the retired blade regenerated material is realized, which is embodied as follows.

[0035] Firstly, the size of the recycled glass fiber is controlled in a specific range, the width is greater than 0.315 mm and the length is greater than 5 mm, so that the mechanical interlocking force between the recycled glass fiber and the mortar matrix (composed of cementitious materials, fine aggregates and the like) can be enhanced by virtue of the size advantage of the recycled glass fiber, and then the interface transition zone structure of the fiber and the matrix is optimized, so that the bridging and constraint effects of the recycled glass fiber can be fully exerted: when the mortar bears a load and produces a large deformation, the fiber can maintain the integrity of the matrix through the interfacial adhesion, thereby significantly improving the crack resistance and toughness of the product; at the same time, the relatively uniformly distributed recycled glass fiber forms a “circular constraint” on the matrix by means of the interfacial adhesion, which can effectively limit the excessive expansion of the matrix under stress and reduce the risk of brittle failure, thereby further improving the compressive strength and flexural bearing capacity of the mortar.

[0036] Secondly, the retired wind turbine blade regenerated powder with a particle size of less than or equal to 0.315 mm is mixed in the fine aggregate, which not only can effectively fill the voids between the fine aggregate particles, improve the internal structure density of the mortar, and thereby enhance the overall strength, but also can fill the micro voids in the interface transition zone, cooperate with the water reducing agent to reduce the interface bubbles, and significantly improve the density and bonding strength of the transition zone, thereby enhancing the compressive and tensile capacity of the mortar.

[0037] Therefore, by adding specific mass fractions of each raw material component, the mortar not only has a suitable water-binder ratio, but also contains an appropriate amount of fine aggregate and water reducing agent, which makes the mortar easily form a more uniform and stable dispersion system during the mixing stage: the appropriate amount of fine aggregate can effectively fill the voids between the cementitious material particles, cooperate with the appropriate water-binder ratio to reduce the free water, and the water reducing agent can reduce the agglomeration resistance of the cementitious particles through adsorption-dispersion, while the retired wind turbine blade regenerated powder with a specific particle size and the recycled glass fiber with a specific size are used to significantly improve the comprehensive performance of the mortar through synergistic effect with other components, and the high-value application of the retired blade regenerated material is successfully realized.

[0038] The technical scheme provides a diversified and applicable path for the resource utilization of the retired wind turbine blade, and a good balance between mechanical properties and economic and environmental friendliness is achieved: from the mechanical properties, the mortar has excellent compressive and flexural strength, good toughness and crack resistance, and can meet the multiple requirements of building structures on bearing capacity and deformation resistance, thanks to the synergistic effect of the retired wind turbine blade recycled powder and recycled glass fiber in the mortar; from the economic and environmental point of view, the dependence on natural resources is reduced, the environmental damage in the mining process is reduced, the raw material cost is more advantageous, the retired blade is recycled to reduce pollution caused by waste landfill and incineration, and carbon emissions are reduced. Ultimately, this will effectively promote the popularization and application of green building material technology in practical engineering and promote the sustainable development of the building industry.

[0039] Exemplarily, the weight fraction of the fine aggregate can be 150 parts, 152 parts, 155 parts, 158 parts, 160 parts, 162 parts, 165 parts, 168 parts, 170 parts, etc. typical but non-limiting values.

[0040] Exemplarily, the weight fraction of the recycled glass fiber can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, etc. typical but non-limiting values.

[0041] Exemplarily, the weight fraction of the water reducing agent can be 0.8 parts, 0.9 parts, 1 part, 1.1 parts, 1.2 parts, etc. typical but non-limiting values.

[0042] Exemplarily, the weight fraction of the water can be 32 parts, 35 parts, 38 parts, 40 parts, etc. typical but non-limiting values.

[0043] In some embodiments, the width D and length L of the recycled glass fiber satisfy: 0.315mm

[0044] Controlling the width and length of the recycled glass fiber within the above range can effectively play its bridging and restraining role. Specifically, a specific width range (such as 0.315mm

[0045] For high-rise buildings, bridge supports, heavy load pavements and other high-demand engineering fields with strict requirements on material mechanical properties, such mortar can effectively cope with complex stress environment and meet the strict standards of long-term stability and safety of high-demand engineering by virtue of the high strength and high toughness brought by the bridging effect of fibers.

[0046] In some embodiments, the recycled glass fibers include at least one of first recycled glass fibers, second recycled glass fibers, and third recycled glass fibers, wherein,

[0047] The width D1 and the length L1 of the first recycled glass fibers satisfy 1.25mm < D1≤ 2.5mm and 15mm < L1≤ 20mm, respectively;

[0048] The width D2 and the length L2 of the second recycled glass fibers satisfy 0.63mm < D2≤ 1.25mm and 10mm < L2≤ 15mm, respectively;

[0049] The width D3 and the length L3 of the third recycled glass fibers satisfy 0.315mm < D3≤ 0.63mm and 5mm < L3≤ 10mm, respectively.

[0050] The first recycled glass fibers, the second recycled glass fibers, and the third recycled glass fibers have different sizes and play different roles in the mortar. Based on this characteristic, the three types of recycled glass fibers with different sizes can be flexibly selected according to the specific requirements of the mortar performance in different scenarios, so as to better adapt to various engineering requirements and further improve the application adaptability of the mortar, as follows:

[0051] The first recycled glass fibers have a larger width and length, and the fiber form tends to be block-shaped with a small aspect ratio. At the same time, a single fiber is prone to aggregation to form a fiber bundle, which reduces the number of fiber bundles and the specific surface area at the same dosage. This structural feature is suitable for building materials with high requirements for bending resistance.

[0052] The size of the second recycled glass fibers is in a moderate range, which enables the fibers to form a more balanced mechanical performance in the mortar system. From the strength dimension, the matching degree of the width and the length of the fibers can ensure the formation of stable mechanical interlocking force between the fibers and the mortar matrix, which can effectively transfer stress when bearing load and avoid local stress concentration caused by uneven distribution due to excessive size. From the toughness perspective, the moderate length enables the fibers to span micro-cracks of medium size and play a bridging role to inhibit crack propagation, while avoiding the weakening of overall toughness caused by the entanglement of excessively long fibers. The balanced performance of this type of fiber enables the mortar incorporating the fiber to meet the requirements of most engineering scenarios for basic strength, while also having good crack resistance and deformation capacity, without compromising on a single performance indicator. It is particularly suitable for application scenarios that require balanced mechanical performance of materials.

[0053] The third regenerated glass fiber has a small size, which is easier to disperse in the mortar, does not easily affect the workability of the mortar, facilitates construction operation, and can improve the integrity and crack resistance of the mortar to a certain extent, and can be used in a scene where the strength requirement of the mortar is relatively low, but the construction convenience and surface flatness are emphasized.

[0054] In some embodiments, the mass fraction of the retired wind turbine blade regenerated powder in the fine aggregate is 5%-15%.

[0055] For example, the mass fraction of the retired wind turbine blade regenerated powder can be 5%, 7%, 10%, 12%, 15%, and the like typical but non-limiting values.

[0056] Controlling the mass fraction of the retired wind turbine blade regenerated powder in the fine aggregate within the above range ensures that there is sufficient regenerated powder in the mortar. These regenerated powders not only effectively fill the voids between fine aggregate particles, improving the density of the internal structure of the mortar; but also precisely fill the micropores in the interface transition zone and reduce air bubbles, while cooperating with the hydration products of the cementitious material to enhance the interfacial bonding strength.

[0057] In some embodiments, the weight fraction of the recycled glass fiber in the mortar is 4-6 parts; and / or, the mass fraction of the retired wind turbine blade regenerated powder in the fine aggregate is 10%-15%.

[0058] For example, the weight fraction of the recycled glass fiber in the mortar can be 4 parts, 4.2 parts, 4.5 parts, 4.8 parts, 5 parts, 5.2 parts, 5.5 parts, 5.8 parts, 6 parts, and the like typical but non-limiting values.

[0059] For example, the mass fraction of the retired wind turbine blade regenerated powder in the fine aggregate can be 10%, 11%, 12%, 13%, 14%, 15%, and the like typical but non-limiting values.

[0060] In the mortar based on the retired wind turbine blade regenerated material, a specific weight fraction of cementitious material, fine aggregate, recycled glass fiber, water reducing agent and water is included. Each component forms a synergistic effect through precise proportioning: the recycled glass fiber can fully exert the bridging and restraining effect, and transmit stress and inhibit crack propagation through close combination with the mortar matrix; the retired wind turbine blade regenerated powder efficiently fills the internal voids and optimizes the structural density due to its particle characteristics. The two components cooperate with other components to significantly improve the comprehensive performance of the mortar.

[0061] In some embodiments, the cementitious material includes cement and mineral admixtures, and the mass fraction of the cement in the cementitious material is 85%-95%.

[0062] Cement provides sufficient hydration products as the main cementitious component to form a solid skeleton structure for the mortar matrix, so that the mortar matrix has sufficient early strength and potential for later strength development; the addition of an appropriate amount of mineral admixture optimizes the cement hydration process, reduces the hydration heat, reduces the risk of mortar shrinkage and cracking, and cooperates with cement to improve the overall performance of the cementitious material. In this way, the cementitious material can not only provide stable matrix support for the bridging and restraining effect of the recycled glass fiber, but also cooperate with the recycled powder and other components to further improve the overall performance of the mortar.

[0063] The application does not have special requirements for the selection of cement. For example, the cement can be any one of ordinary portland cement, composite portland cement, slag portland cement, and fly ash portland cement. The cement in the cementitious material can select a single type of cement. However, it should be noted that the strength of the cement is not less than 42.5 MPa.

[0064] The application does not have special requirements for the selection of mineral admixtures. As an example, the mineral admixtures include but are not limited to at least one of silica fume, fly ash, slag, and blast furnace slag.

[0065] In some embodiments, the fine aggregate further includes a sandstone material, and the particle size of the sandstone material is 0.212mm-0.425mm.

[0066] For example, the particle size of the sandstone material can be 0.212mm, 0.230mm, 0.250mm, 0.300mm, 0.320mm, 0.350mm, 0.380mm, 0.400mm, 0.410mm, 0.425mm, etc. typical but not limited value.

[0067] The sandstone material is mixed in the fine aggregate, and its specific particle size characteristics enable it to form a complementary particle size distribution with the recycled powder of the retired wind turbine blade. The recycled powder can fill the small gaps between the sandstone material particles, and the sandstone material can support the mortar structure as a skeleton, and the combination of the two can greatly reduce the porosity of the mortar, improve the overall density, and improve the overall strength of the mortar. In addition, the sandstone material of this particle size can form good bonding with the hydration products of the cementitious material, and enhance the strength of the interface transition zone. At the same time, its size is well adapted to the recycled glass fiber, and it will not hinder the uniform dispersion of the fiber due to the too large particle size, nor will it cause the fiber to lack effective support when stressed due to the too small particle size, thereby promoting the full play of the bridging and restraining effect of the recycled glass fiber, and further optimizing the overall mechanical properties of the mortar.

[0068] The application does not have special requirements for the selection of sandstone material. As an example, the sandstone material can include but is not limited to at least one of silica sand, river sand, and standard sand.

[0069] The application does not have special requirements for the selection of water reducing agent. As an example, the water reducing agent includes, but is not limited to, at least one of lignin sulfonate, polycarboxylate water reducing agent, and naphthalene water reducing agent.

[0070] The second aspect of the embodiment of the application provides a preparation method of a mortar based on a retired wind turbine blade regenerated material, including the following steps:

[0071] In step S10, the retired wind turbine blade regenerated powder and the retired wind turbine blade regenerated glass fiber are recovered from the retired wind turbine blade, wherein the particle size of the retired wind turbine blade regenerated powder is less than or equal to 0.315 mm, and the width of the retired wind turbine blade regenerated glass fiber is greater than 0.315 mm and the length is greater than 5 mm.

[0072] In step S20, 150-170 parts of fine aggregate including the retired wind turbine blade regenerated powder, 2-6 parts of regenerated glass fiber including the retired wind turbine blade regenerated glass fiber, 100 parts of cementing material, 0.8-1.2 parts of water reducing agent, and 32-40 parts of water are mixed and treated to obtain the mortar based on the retired wind turbine blade regenerated material.

[0073] The preparation method of the mortar based on the retired wind turbine blade regenerated material provided by the second aspect of the embodiment of the application can prepare the mortar based on the retired wind turbine blade regenerated material by mixing and treating the raw materials, and is simple, convenient and easy to operate, and is conducive to wide use.

[0074] In some embodiments, in step S10, the selection and weight ratio of the raw material components have been described in detail above, and will not be repeated here.

[0075] In some embodiments, in step S10, the retired wind turbine blade is recovered and processed as follows:

[0076] The retired wind turbine blade is sequentially cut, washed, crushed, pulverized and screened to obtain the retired wind turbine blade regenerated powder and the retired wind turbine blade regenerated glass fiber.

[0077] The retired fan blade is treated by cutting, cleaning, crushing and pulverizing to obtain a mixture of retired fan blade regenerated powder and retired fan blade regenerated glass fiber. On this basis, screening treatment is carried out, and a screen with a diameter of 0.315 mm is selected: the undersize of the screen is the retired fan blade regenerated powder used in the application; the oversize of the screen is the retired fan blade regenerated glass fiber (referred to as regenerated glass fiber). The cutting, cleaning, crushing and pulverizing processes of the retired fan blade are all well-known methods to those skilled in the art. In addition, it should be noted that due to the wet treatment during the pulverizing process to reduce dust pollution, the relative humidity of the product is high, and direct screening is not ideal. Therefore, the product is naturally air-dried for 1 day before screening.

[0078] To further improve the bridging effect of the regenerated glass fiber, the oversize of the above-mentioned screening treatment is subjected to secondary screening treatment, and a screen with a diameter of 2.5 mm is selected: the undersize of the screen is the needle-shaped regenerated glass fiber with a width D satisfying 0.315 mm < D ≤ 2.5 mm, and this specific width of the regenerated glass fiber is more conducive to playing a bridging role in the mortar.

[0079] To further optimize the use requirements of the mortar in different scenarios, the regenerated glass fiber obtained by the secondary screening treatment can be subjected to tertiary screening treatment, and screens with diameters of 1.25 mm and 0.63 mm are selected for screening in turn, and finally three types of regenerated glass fiber are obtained. Among them, the first regenerated glass fiber has a width D1 satisfying 1.25 mm < D1 ≤ 2.5 mm and a length L1 satisfying 15 mm < L1 ≤ 20 mm; the second regenerated glass fiber has a width D2 satisfying 0.63 mm < D2 ≤ 1.25 mm and a length L2 satisfying 10 mm < L2 ≤ 15 mm; and the third regenerated glass fiber has a width D3 satisfying 0.315 mm < D3 ≤ 0.63 mm and a length L3 satisfying 5 mm < L3 ≤ 10 mm.

[0080] The three types of regenerated glass fiber with different sizes can be flexibly selected according to the specific requirements of different scenarios for the performance of the mortar, better adapt to various engineering needs, and further improve the application adaptability of the mortar.

[0081] In some embodiments, in step S20, the specific process of mixing the cementitious material, fine aggregate, regenerated glass fiber, water reducing agent and water is as follows:

[0082] Step S21, the cementitious material and fine aggregate are added to the mortar mixer, and stirred at a speed of 60 rpm-100 rpm for 3 min-5 min to obtain a first mixture;

[0083] Step S22, the water reducing agent is dispersed into the water to obtain a mixed liquid;

[0084] The part of the mixture is added to the first mixture, stirred at a speed of 60 rpm-100 rpm for 1 min-2 min, and then the remaining mixture is added, stirred at a speed of 300 rpm-600 rpm for 3 min-5 min, to obtain a second mixture;

[0085] Step S23, the regenerated glass fiber is added to the second mixture along the stirring direction at a stirring speed of 60 rpm-100 rpm, and after the regenerated glass fiber is completely added, it is stirred at a speed of 300 rpm-600 rpm for 3 min-5 min, to obtain the mortar based on the retired wind turbine blade regenerated material.

[0086] Before the mixing process, the fine aggregate can be laid on the cementitious material in a relatively uniform manner, which can effectively reduce the loss of cementitious material caused by scattering during stirring. Then, the cementitious material and fine aggregate are stirred in a dry state under low speed conditions to fully disperse and mix them.

[0087] In the wet mixing stage, the water and water reducing agent are fully mixed to form a mixture, which is then added to the mixer in two steps: 40%-60% of the total mass of the mixture is added first, and after the raw materials are preliminarily mixed uniformly, the remaining mixture is added. This step-by-step addition method can promote the more complete fusion of the raw material components and improve the mixing uniformity.

[0088] After the wet mixing is completed, the regenerated glass fiber is slowly and uniformly scattered along the stirring direction. To prevent the fiber from splashing, the process is kept at a low speed and slow stirring; after the regenerated glass fiber is completely added, it is switched to a fast stirring mode to uniformly disperse the fiber in the mortar, and finally a mortar with uniform texture is obtained.

[0089] The above mixing process can be prepared using a mortar mixer, for example, a mortar mixer with a capacity of 5L is used for preparation. Before the mixing process, a damp cloth can be used to wipe the inner wall and stirring blades of the mixer to wet the surface and reduce the adhesion loss of the raw material components during stirring. After the mortar mixing is completed, the inner wall and blades of the mixer are cleaned in time, and the surface water is wiped dry with a cloth to ensure that there is no residual water droplet in the mixer for the next group of sample preparation.

[0090] In some embodiments, the method for preparing the mortar based on the retired wind turbine blade regenerated material further comprises the following steps:

[0091] The mortar prepared by the mixing process is shaped and then cured.

[0092] The shaping process and curing treatment of the mortar are well-known methods to those skilled in the art.

[0093] Specifically, appropriate molds can be selected according to subsequent test requirements: for example, a cubic mold is selected for a test piece for compression strength test, a prism mold is selected for a test piece for bending strength test, and a dog bone mold is selected for a test piece for tensile performance test.

[0094] As an example, the specific steps of the molding process are as follows:

[0095] The uniformly stirred mortar is poured into the selected mold in sequence. Each mold needs to be vibrated on a vibrating table for 50 seconds to remove excess air bubbles in the mortar through vibration and ensure that the mortar is densely distributed; then the surface of the test piece is smoothed with a trowel to avoid interference with the subsequent test results due to uneven surface. After the mortar surface is initially set, a plastic film is covered to reduce water evaporation and prevent early cracks in the test piece due to excessive water loss. The test piece can be demolded after 24 hours of standing and enters the subsequent curing stage.

[0096] As an example, the curing process can be carried out in a constant temperature and humidity curing box for standard curing, with a temperature of 20℃ and a relative humidity of 95%.

[0097] The mortar provided by the embodiments of the present application can achieve a good balance between mechanical properties and economic and environmental properties after molding and curing treatment due to the inclusion of the above-mentioned components in specific weight proportions. In terms of mechanical properties, the test piece not only has excellent compressive and bending strength, but also has good toughness and crack resistance, thanks to the synergistic reinforcing effect of the retired wind turbine blade regenerated powder and the regenerated glass fiber in the mortar, which can meet the multiple requirements of building structures for load-bearing capacity and deformation resistance. In terms of economic and environmental aspects, the test piece uses retired wind turbine blade regenerated materials as the core raw material, greatly reducing the dependence on natural sand, virgin fiber and other resources, and the raw material cost is more advantageous. At the same time, through the resource utilization of retired blades, the environmental pressure and carbon emissions of waste disposal are reduced, which meets the development trend of green building materials.

[0098] This performance balance allows the mortar to flexibly adjust the material mixing ratio according to different engineering requirements (such as building reinforcement, pavement engineering, etc.), to realize the customized design of high-strength, high-toughness or low-carbon mortar, providing a diversified and practical technical path to solve the high-value application problem of retired blade regenerated materials, and effectively promoting its popularization and application in practical engineering.

[0099] Due to the excellent mechanical properties of the mortar, it can be widely used in building reinforcement, pavement engineering, ground cushion, decorative components and other scenarios: while ensuring the safety and reliability of the engineering structure, its environmental properties can bring significant green benefits to the project, not only further expanding the application boundary of retired wind turbine blade regenerated materials, but also providing a practical product solution for the sustainable development of the building industry.

[0100] The following will be described with reference to specific embodiments.

[0101] Embodiment 1

[0102] The embodiment provides a mortar based on a retired wind turbine blade recycled material and a preparation method thereof.

[0103] The mortar based on the retired wind turbine blade recycled material comprises the following raw material components in parts by weight:

[0104]

[0105] The fine aggregate comprises silica sand and the retired wind turbine blade recycled powder in a mass ratio of 95:5, and the particle size of the retired wind turbine blade recycled powder is ≤0.315 mm.

[0106] The recycled glass fiber is the recycled glass fiber obtained after recycling treatment of the retired wind turbine blade, and the recycled glass fiber is the second recycled glass fiber.

[0107] The cementing material is silica fume and portland cement in a mass ratio of 1:9.

[0108] The preparation method of the mortar based on the retired wind turbine blade recycled material comprises the following steps:

[0109] Step 1, the raw material components are respectively weighed according to the above proportions.

[0110] Step 2, a mortar mixer with a capacity of 5L is used for preparation;

[0111] The cementing material and the fine aggregate are added into the mortar mixer, and stirred at a speed of 100 rpm for 3 min to obtain a first mixture;

[0112] The water reducing agent is dispersed into water to obtain a mixed solution; 50 wt% of the mixed solution is added into the first mixture, stirred at a speed of 100 rpm for 1 min, and then the remaining mixed solution is added, stirred at a speed of 300 rpm for 3 min to obtain a second mixture;

[0113] The recycled glass fiber is added into the second mixture along the stirring direction under the condition that the stirring speed is 100 rpm, and after the recycled glass fiber is completely added, the mixture is stirred at a speed of 300 rpm for 3 min to obtain a uniformly mixed mortar.

[0114] Step 3, the uniformly mixed mortar is poured into a mold (different molds are used according to different performance requirements), vibrated on a vibrating table for 50 seconds, and then the surface of the test piece is smoothed with a spatula; after the surface of the mortar is initially cured, the test piece is covered with plastic film, demolded after being placed for 24 hours, and placed in a constant temperature and humidity curing box for standard curing (temperature 20℃, relative humidity 95%).

[0115] Example 2-11

[0116] Example 2-11 provides a mortar based on retired wind turbine blade recycled material and a preparation method thereof, which is different from Example 1 in that the components of the mortar based on retired wind turbine blade recycled material are different, specifically at least one of the mass percentage of retired wind turbine blade recycled powder in fine aggregate, the specification of recycled glass fiber, and the addition amount of recycled glass fiber is different, for specific details, see Table 1.

[0117] Table 1

[0118]

[0119]

[0120] In Table 1, RWTB powder refers to retired wind turbine blade recycled powder, and GFRP refers to recycled glass fiber.

[0121] The number after the letter "G" represents the mass percentage of retired wind turbine blade recycled powder in fine aggregate; the number after the letter "R" represents the addition weight fraction of recycled glass fiber in the mortar. The letter "L" represents the length of GFRP, wherein L1 represents the first recycled glass fiber, L2 represents the second recycled glass fiber, and L3 represents the third recycled glass fiber.

[0122] Comparative Example 1

[0123] This comparative example is a mortar, which is different from Example 1 in that no recycled glass fiber is added, and no retired wind turbine blade recycled powder is added in the fine aggregate.

[0124] Comparative Example 2

[0125] This comparative example is a mortar, which is different from Example 1 in that no recycled glass fiber is added, and the mass percentage of retired wind turbine blade recycled powder in the fine aggregate is 5%.

[0126] Comparative Example 3

[0127] This comparative example is a mortar, which is different from Example 1 in that no recycled glass fiber is added, and the mass percentage of retired wind turbine blade recycled powder in the fine aggregate is 10%.

[0128] Comparative Example 4

[0129] This comparative example is a mortar, which is different from Example 1 in that no recycled glass fiber is added, and the mass percentage of retired wind turbine blade recycled powder in the fine aggregate is 15%.

[0130] The mortars prepared in the above examples and comparative examples are subjected to mechanical property detection and life cycle assessment.

[0131] Mechanical property testing

[0132] (1) Compressive strength test

[0133] Compressive strength testing was conducted in accordance with T0553-2005 Cement Concrete Compressive Strength Test Method. Mortar specimens were 50mm cubic, using a 200-ton electro-hydraulic servo pressure testing machine. The stress rate was 0.5 MPa / s, and the test ended when the force decay rate reached 60%.

[0134] The specific test steps are as follows: Specimen preparation and curing should comply with relevant standards to ensure that the specimens reach the required age and condition before testing; at the test age, remove the specimens from the curing room and test them as soon as possible to avoid changes in humidity; before testing, measure the specimen dimensions to an accuracy of 1mm to ensure the accuracy of the calculation; place the specimen in the center of the lower pressure plate of the testing machine, ensuring that the pressure-bearing surface of the specimen is perpendicular to the top surface during molding; load the specimen at a stress rate of 0.5MPa / s. When the specimen approaches failure and begins to deform rapidly, stop adjusting the testing machine throttle until the specimen fails, and record the failure load; calculate the compressive strength based on the failure load and the pressure-bearing area of ​​the specimen, accurate to 0.1MPa. The arithmetic mean of the measured values ​​of the three specimens is used as the measured value, and the result is accurate to 0.1MPa.

[0135] Compressive strength test Figure 1 shown. Figure 1 Figure a shows the schematic diagram before the mortar test. Figure 1 b in FIG. 1 is a schematic diagram showing the mortar after the test.

[0136] The compressive strength of mortar is calculated according to formula (1-1):

[0137]

[0138] In formula (1-1):

[0139] F cu It represents the compressive strength of concrete cube in megapascals (MPa);

[0140] F represents the ultimate load, the unit is Newton (N);

[0141] A represents the pressure area, the unit is square centimeters (mm 2 ).

[0142] (2) Flexural strength test

[0143] The flexural strength test was carried out according to the “Method for Testing Strength of Cement Mortar” (GB / T 17671-2021). The mortar was a prism specimen with a size of 40 mm x 40 mm x 160 mm. During the test process, the specimen was placed in a 30-ton microcomputer-controlled electronic universal testing machine, a single-point loading mode was adopted, and a constant loading rate of 50 N / s was applied until the specimen was broken, and the maximum load and deflection at the time of breaking were recorded. Three specimens were tested for each mix proportion to calculate the average value and standard deviation of the flexural strength, thereby ensuring the reliability and representativeness of the data.

[0144] The flexural strength test was carried out according to the “Method for Testing Strength of Cement Mortar” (GB / T 17671-2021). The mortar was a prism specimen with a size of 40 mm x 40 mm x 160 mm. During the test process, the specimen was placed in a 30-ton microcomputer-controlled electronic universal testing machine, a single-point loading mode was adopted, and a constant loading rate of 50 N / s was applied until the specimen was broken, and the maximum load and deflection at the time of breaking were recorded. Three specimens were tested for each mix proportion to calculate the average value and standard deviation of the flexural strength, thereby ensuring the reliability and representativeness of the data. Figure 2 Figure 2 Figure a in the middle indicates a schematic diagram before the mortar test, Figure 2 Figure b in the middle indicates a schematic diagram after the mortar test.

[0145] The flexural strength of the specimen was calculated according to formula (1-2):

[0146]

[0147] In formula (1-2):

[0148] R f represents the flexural strength, with units of megapascals (MPa);

[0149] F f represents the load applied to the middle of the prism at the time of breaking, with units of newtons (N);

[0150] L represents the distance between the supporting cylinders, with units of millimeters (mm);

[0151] b represents the side length of the square cross-section of the prism, with units of millimeters (mm).

[0152] (3) Tensile property test

[0153] The tensile property test was carried out according to the “Method for Testing Mechanical Properties of High Ductility Fiber Reinforced Cementitious Composites” (JC / T 2461-2018). The specimen was dog-bone shaped with a size of 330 mm x 60 mm x 13 mm, and a single-axis tensile test was carried out using an E45.105 5-ton tensile testing machine (MTS). One LVDT was installed on each side of the specimen to measure the deformation of the 80 mm equal-section gauge length section in the middle, and the loading rate was 0.5 mm / min. During the test, the specimen was single-seam broken, and the initial tensile strength was equal to the ultimate tensile strength. By measuring the maximum tensile force at the time of breaking and the corresponding deformation, the tensile strength and ultimate elongation were calculated, and four specimens were tested for each group to ensure data reliability.

[0154] The single-axis tensile test was carried out as shown in Figure 3 ​The ultimate elongation of each test piece is obtained by taking the arithmetic average of the two-side ultimate elongations. Figure 3 Fig. a in the drawing shows a schematic diagram before the mortar test, Figure 3 Fig. b in the drawing shows a schematic diagram after the mortar test.

[0155] The ultimate tensile strength is calculated according to formula (1-3):

[0156]

[0157] In formula (1-3):

[0158] f tu represents the ultimate tensile strength, with the unit of megapascal (MPa);

[0159] F tu represents the maximum tensile force value that the test piece can withstand, with the unit of newton (N);

[0160] A t represents the initial cross-sectional area of the deformation measurement zone of the test piece, with the unit of square millimeter (mm 2 ).

[0161] The ultimate elongation is calculated according to formula (1-4):

[0162]

[0163] In formula (1-4):

[0164] ε tu represents the ultimate elongation, with the unit of %;

[0165] l tu represents the reading of the micro-deformation measuring instrument at the maximum tensile force, with the unit of millimeter (mm);

[0166] l0represents the reading of the micro-deformation measuring instrument before loading, with the unit of millimeter (mm);

[0167] L tg represents the measurement gauge length of the micro-deformation measuring instrument, with the unit of millimeter (mm).

[0168] The test results of the mechanical properties are shown in Table 2.

[0169] Table 2 Test results of mechanical properties The 28d compressive strength refers to the ability of the mortar to resist crushing damage after being cured for 28 days, indicating the maximum ability of the material to withstand pressure.

[0170] Flexural strength: 28d flexural strength refers to the ability of the mortar to resist bending failure after 28 days of curing, reflecting the crack resistance and bending resistance of the material; deflection refers to the maximum deformation displacement of the material when bending under stress, which is used to measure its flexibility and deformation capacity; fracture energy refers to the total energy absorbed by the material during the failure process, indicating its crack resistance and energy dissipation capacity.

[0171] Tensile performance: 28d tensile strength refers to the ability of the mortar to resist tensile failure after 28 days of curing, reflecting the crack resistance of the material; ultimate tensile strain: the maximum tensile deformation capacity of the material before tensile failure, reflecting its ductility and deformation bearing capacity.

[0172] As can be seen from Table 2, compared with Comparative Example 1, by adding specific particle size of retired wind turbine blade recycled powder and specific size of recycled glass fiber, the mechanical properties of the mortar can be effectively improved, the compressive strength is increased by about 35%-50%, the flexural strength is increased by about 77%-90%, and the fracture energy is increased by 3-4 times.

[0173] As can be seen from Examples 5, 10 and 11, under the premise of the same amount of retired wind turbine blade recycled powder and recycled glass fiber, the performance of the mortar mixed with different sizes of recycled glass fiber shows obvious differentiation: in Example 10, the first recycled glass fiber with larger width and length, the flexural strength and fracture energy of the mortar are particularly outstanding; in Example 11, the third recycled glass fiber with smaller width and length, the compressive strength of the product is more outstanding; and in Example 5, the second recycled glass fiber with moderate size, the mechanical properties of the mortar are in the most balanced state.

[0174] Table 3

[0175] Specimen Code 28d tensile strength (Mpa) Example 1 G2R5L2 2.72 Example 4 G4R5L2 2.74 Example 7 G6R5L2 2.66 Comparative Example 2 G0R5 2.5

[0176] As can be seen from Table 3, combined with Examples 1, 4, 7 and Comparative Example 2, the synergistic effect between specific particle size of retired wind turbine blade recycled powder and specific size of recycled glass fiber can significantly improve the tensile strength of the mortar, and the enhancement effect is significant.

[0177] Table 4

[0178] Specimen Code 28d compressive strength (Mpa) Example 2 G2R10L2 66.33 Example 5 G4R10L2 63.69 Example 8 G6R10L2 67.06 Comparative Example 3 G0R10 60.95

[0179] The data in Table 4, comparing Examples 2, 5, and 8 with Comparative Example 3, demonstrate that when recycled powder from retired wind turbine blades of a specific particle size is used in synergy with recycled glass fiber of a specific size, the compressive strength of the mortar can be significantly improved, with the strengthening effect being particularly pronounced. This phenomenon demonstrates that the matching of the particle size and dimensional parameters of the two recycled materials is key to improving the mechanical properties of the mortar. By precisely controlling this synergistic effect, the density and stress transfer efficiency of the mortar's internal structure can be effectively optimized, thereby achieving a significant increase in compressive strength.

[0180] Table 5

[0181] Specimen Code 28d flexural strength (Mpa) Example 3 G2R15L2 11.11 Example 6 G4R15L2 11.23 Example 9 G6R15L2 11.87 Comparative Example 4 G0R15 11.07

[0182] The data in Table 5, combined with the comparison of Examples 3, 6, and 9 with Comparative Example 4, demonstrates that when recycled powder from retired wind turbine blades of a specific particle size and recycled glass fiber of a specific size form a synergistic effect, the mortar's flexural strength can be significantly improved, with a particularly pronounced strengthening effect. The core of this synergistic effect lies in the precise matching of the size and particle size parameters of the two recycled materials. The recycled powder fills the mortar's internal pores to optimize structural density, while the recycled fiber inhibits microcrack propagation through a bridging effect. Together, these two elements significantly enhance the mortar's energy absorption and crack control capabilities under bending stress, ultimately resulting in a significant increase in flexural strength.

[0183] Combining Tables 3, 4, and 5, it can be seen that when the content of recycled powder from retired wind turbine blades changes, the synergistic effect between it and recycled fibers of the same specifications shows different focuses: when the recycled powder content is at a low level, the synergistic effect of the two focuses more on improving tensile strength. At this time, the recycled powder mainly reduces stress concentration by refining the matrix microstructure, while the fibers enhance the material's crack toughness through a bridging effect, jointly strengthening the mortar's ability to resist tensile failure. When the recycled powder content is in the medium range, the synergistic effect tends to improve compressive performance. At this time, the recycled powder mainly fills the matrix pores to optimize density, while the recycled fibers disperse stress to help suppress local deformation under compression, jointly strengthening the material's compression resistance. When the recycled powder content is high, the synergistic effect more prominently highlights the improvement of flexural strength. This may be because the higher content of recycled powder and fibers form a more complete "filling-bridging" system, which can not only refine the interface transition zone through the powder, but also enhance the material's crack control ability under bending with the help of the fiber's toughness.

[0184] Life cycle assessment

[0185] The LCA model of the mortar based on the retired wind turbine blade recycled material was constructed by SimaPro software, and the influence of the incorporation of RWTB powder and GFRP on the carbon emission, resource consumption, and water resource utilization of the whole production process of the mortar based on the retired wind turbine blade recycled material was quantified systematically, so as to provide a scientific basis for green building material design and high-value utilization of solid waste.

[0186] In order to comprehensively evaluate the environmental benefits and resource feasibility of the retired blade recycled material in the cement-based mortar, LCA was carried out to support the conservation of limited natural resources and the reduction of environmental load. The LCA work strictly followed the standard methodology of ISO 14040 / 14044, which is described as follows:

[0187] Evaluation boundary and functional unit This LCA adopted the "from cradle to gate" boundary condition, which covers all aspects of the mortar production stage, including raw material mining, recycled material crushing and screening, production of traditional raw materials (such as cement, sand, silica fume, etc.), transportation, mixing and preparation, and molding processes, and does not include the construction, use and disposal stages. This study takes 1 cubic meter of mortar as the functional unit, which facilitates the standardized comparison of the environmental performance of different mix proportions.

[0188] The specific process is as follows:

[0189] (I) Objective and scope definition

[0190] The objective is to quantitatively analyze the influence of the incorporation of RWTB powder and GFRP on the environmental performance of the whole life cycle of the mortar based on the retired wind turbine blade recycled material, and to find the optimal mix proportion combination that takes into account the mechanical properties and environmental benefits. The system scope covers the acquisition, processing, transportation and mortar preparation of the retired blade recycled material and other components.

[0191] (II) Life cycle inventory analysis (LCI)

[0192] The production energy consumption, material consumption, transportation emission data of each raw material (RWTB powder, GFRP, cement, sand, silica fume, water reducing agent, etc.), and the energy and water resource consumption information of the mortar preparation stage were collected systematically. The data sources include field monitoring, literature database and SimaPro built-in database, to ensure the reliability and applicability of the data.

[0193] (III) Life cycle impact assessment (LCIA)

[0194] Representative environmental impact categories were selected for evaluation, including but not limited to: climate change (carbon footprint, kgCO2-eq), fossil resource consumption (MJ), water resource utilization (m 3 ), acidification potential (molH +), human health toxicity (CTUh), the normalized and weighted method is applied to comprehensively compare the environmental impact of each formula scheme.

[0195] The evaluation results of the life cycle are shown in Table 6.

[0196] Table 6 LCA results

[0197]

[0198] Climate change (kg CO2): measures the contribution of greenhouse gas emissions to global warming during the life cycle, and the result is expressed in terms of carbon dioxide equivalent. Particulate matter (disease incidence): reflects the human health risk caused by particulate matter emissions (PM2.5, PM10, etc.), and the unit is expressed in terms of the incidence of diseases that can be caused. Land use (Pt): assesses the impact of products or processes on land occupation and ecosystem services, and Pt is the standard unit of environmental impact score. Ozone layer depletion (kg CFC11): indicates the potential of emissions to destroy the ozone layer, and is measured in terms of Freon-11 (CFC-11) equivalent. Fossil resource use (MJ): the total amount of fossil energy such as coal, oil, natural gas, etc. consumed during the life cycle, expressed in megajoules. Water resource use (m 3 deprivation): the degree of water resource deprivation caused by water use to the environment and society during the life cycle, expressed in terms of water deprivation volume (cubic meters).

[0199] As can be seen from Table 6, compared with Comparative Example 1, the mortar of the embodiments of the present application performs significantly in terms of environmental benefits by adding the retired wind turbine blade regenerated powder and the regenerated glass fiber:

[0200] When the addition amount of the retired wind turbine blade regenerated powder (RWT powder) increases, the carbon emissions can be reduced by 3% to 5%, and the resource consumption is simultaneously reduced by 5% to 7%, which embodies the environmental value of the regenerated material replacing natural resources;

[0201] The change of the dosage of the regenerated glass fiber (GFRP) has little effect on the environmental indicators, and the fluctuation range is less than 1%, which shows that the dosage adjustment of the regenerated glass fiber will not significantly increase the environmental burden, and the environmental cost is controllable.

[0202] As for the size change of the GFRP, since a unified crushing and screening process is adopted, the environmental performance of different sizes of fibers remains consistent, which further confirms the advantage of the treatment process in environmental stability.

[0203] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A mortar based on recycled materials from retired wind turbine blades, characterized in that: The raw material components include the following parts by weight: Wherein, the fine aggregate comprises recycled powder from retired fan blades, and the particle size of the recycled powder from retired fan blades is less than or equal to 0.315 mm; The regenerated glass fiber includes regenerated glass fiber obtained by recycling retired wind turbine blades, and the width of the regenerated glass fiber is greater than 0.315 mm and the length is greater than 5 mm.

2. The mortar based on recycled materials from retired wind turbine blades according to claim 1, characterized in that: The width D and length L of the regenerated glass fiber respectively satisfy the following: 0.315 mm < D ≤ 2.5 mm, 5 mm < L ≤ 20 mm.

3. The mortar based on recycled materials from retired wind turbine blades according to claim 2, characterized in that: The regenerated glass fiber includes at least one of a first regenerated glass fiber, a second regenerated glass fiber, and a third regenerated glass fiber, wherein The width D1 and length L1 of the first regenerated glass fiber respectively satisfy: 1.25 mm < D1 ≤ 2.5 mm, 15 mm < L1 ≤ 20 mm; The width D2 and length L2 of the second regenerated glass fiber respectively satisfy the following conditions: 0.63 mm < D2 ≤ 1.25 mm, 10 mm < L2 ≤ 15 mm; The width D3 and length L3 of the third regenerated glass fiber respectively satisfy the following: 0.315 mm < D3 ≤ 0.63 mm, 5 mm < L3 ≤ 10 mm.

4. The mortar based on recycled materials from retired wind turbine blades according to claim 1, characterized in that: In the fine aggregate, the mass proportion of the retired wind turbine blade recycled powder is 5%-15%.

5. The mortar based on recycled materials from retired wind turbine blades according to claim 4, characterized in that: In the mortar, the weight fraction of the recycled glass fiber is 4 parts to 6 parts; And / or, in the fine aggregate, the mass proportion of the retired wind turbine blade recycled powder is 10%-15%.

6. The mortar based on recycled materials from retired wind turbine blades according to any one of claims 1 to 5, characterized in that: The cementitious material includes cement and mineral admixtures, and the mass proportion of the cement in the cementitious material is 85%-95%.

7. The mortar based on recycled materials from retired wind turbine blades according to any one of claims 1 to 5, characterized in that: The fine aggregate also includes sand and gravel materials, and the particle size of the sand and gravel materials is 0.212mm-0.425mm.

8. A method for preparing mortar based on recycled materials from retired wind turbine blades, characterized in that: The following steps are involved: Recovering retired fan blade regeneration powder and retired fan blade regeneration glass fiber from retired fan blades, wherein the retired fan blade regeneration powder has a particle size of less than or equal to 0.315 mm, and the retired fan blade regeneration glass fiber has a width greater than 0.315 mm and a length greater than 5 mm; 150-170 parts of fine aggregate including the recycled powder of retired fan blades, 2-6 parts of recycled glass fiber including the recycled glass fiber of retired fan blades, 100 parts of cementitious material, 0.8-1.2 parts of water reducer and 32-40 parts of water are mixed to obtain mortar based on recycled materials from retired fan blades.

9. The method for preparing mortar based on recycled materials from retired wind turbine blades according to claim 8, characterized in that: The recycling steps of the retired fan blades are as follows: The retired fan blades are sequentially cut, cleaned, crushed, pulverized and screened to obtain the retired fan blade regenerated powder and the retired fan blade regenerated glass fiber.

10. The method for preparing mortar based on recycled materials from retired wind turbine blades according to claim 8 or 9, characterized in that: The preparation method further comprises: The mortar subjected to the mixing treatment is cured after being formed.

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