Retired wind power blade cement product and preparation method thereof

Abstract

The invention relates to an ex-service wind power blade cement product and a preparation method thereof, and the preparation method comprises the following steps: pretreatment of an ex-service wind power blade: removing a metal connecting piece, and removing a surface coating of the ex-service wind power blade; the retired wind power blade is crushed, specifically, a blade base body, containing glass fibers, in the retired wind power blade is taken and crushed; and composite molding: mixing the crushed decommissioned wind power blade crushed material into the cement paste according to the mass ratio, stirring, and then performing injection molding and maintenance. According to the retired wind power blade cement product provided by the invention, on one hand, the problems of high difficulty and high cost in large-scale high-value utilization of the retired wind power blade are effectively solved, and a new way and a new method are provided for large-scale high-value utilization of the retired wind power blade; and on the other hand, the glass fiber-containing blade matrix crushed aggregates in the retired wind power blade are used as aggregates to be added into the cement product, so that the characteristic of strong toughness of the recycled glass fibers can be fully exerted, and the mechanical strength of the cement product is enhanced.

Description

Technical Field

[0001] This invention relates to the field of building materials manufacturing technology, specifically to a cement product for decommissioned wind turbine blades and its preparation method. Background Technology

[0002] Wind power generation is an important low-carbon development method, and its scale is constantly growing. With the continuous development of wind power, early wind turbine equipment will eventually be decommissioned, typically with a service life of around 20 years. Wind turbine blades are the main solid waste generated after the decommissioning of wind turbines. Their main components include approximately 60% reinforcing fibers, 23% thermosetting polymer resins and adhesives, 9% core material, and 8% metal. They are characterized by being porous, high-strength, stable, and corrosion-resistant. However, due to their composition, recycling them is challenging. Traditional methods of disposal, such as landfilling or incineration, would cause environmental pollution and resource waste. Therefore, there is an urgent need to develop high-value utilization technologies for them. Summary of the Invention

[0003] Therefore, the present invention provides a cement product for decommissioned wind turbine blades and a method for preparing the same, in order to solve the technical problem that decommissioned wind turbine blades are difficult to recycle in the prior art.

[0004] The standard sand used in this invention is the ISO standard sand for cement (GB / T 17671-2021).

[0005] According to an embodiment of the present invention, in a first aspect, a method for preparing cement products of decommissioned wind turbine blades is provided, comprising the following steps:

[0006] Pre-treatment of decommissioned wind turbine blades: Remove metal connectors and remove the surface coating of decommissioned wind turbine blades;

[0007] Crushing of decommissioned wind turbine blades: Take the blade matrix containing glass fiber from the decommissioned wind turbine blades and crush it;

[0008] Composite molding: The crushed scraps of retired wind turbine blades are mixed into cement slurry according to the mass ratio, stirred, poured into molds, and cured.

[0009] In some embodiments of the present invention, the removal of the surface coating in the pretreatment of decommissioned wind turbine blades specifically involves: using a mechanical ultrasonic vibration combined with water vibration dispersion method to remove the surface coating of the decommissioned wind turbine blades.

[0010] In some embodiments of the present invention, the pulverization of decommissioned wind turbine blades includes the following steps:

[0011] The glass fiber-containing blade matrix from retired wind turbine blades is cut, crushed, and ground.

[0012] In some embodiments of the present invention, the particle size of the decommissioned wind turbine blade after crushing is 15-30 μm.

[0013] In some embodiments of the present invention, in the composite molding process, the cement paste raw material components, by mass parts, include: 80%-90% cement clinker, 5%-10% slag, and 5%-10% fly ash.

[0014] The cement clinker includes any one of silicate cement and sulfoaluminate cement.

[0015] In some embodiments of the present invention, the composite molding step includes:

[0016] The scrap of decommissioned wind turbine blades is mixed with cement slurry raw materials to obtain a premix;

[0017] Mix the premix with water at a water-to-binder ratio of 0.3-0.4 until homogeneous;

[0018] Add standard sand, with a mass ratio of standard sand to cement paste raw material of 1:2, and continue stirring to obtain mortar;

[0019] The mortar is poured into molds and then cured.

[0020] In some embodiments of the present invention, the mass of the decommissioned wind turbine blade fragments is 4-8% of the mass of the cement slurry raw materials.

[0021] In some embodiments of the present invention, the stirring is performed by slowly stirring the slurry with a stirring rod for 3-5 minutes.

[0022] In some embodiments of the present invention, the maintenance conditions are: temperature 20°C, humidity 90%RH.

[0023] According to some embodiments of the present invention, in a second aspect, a cement product for decommissioned wind turbine blades is provided, which is prepared by any of the preparation methods described above.

[0024] The technical solution of this invention has the following advantages:

[0025] 1. The present invention provides a method for preparing cement products of decommissioned wind turbine blades, comprising the following steps: pretreatment of decommissioned wind turbine blades: removing metal connectors and removing surface coatings; crushing of decommissioned wind turbine blades: taking the blade matrix containing glass fiber from the decommissioned wind turbine blades and crushing it; composite molding: adding the treated blade particles into cement slurry according to the mass ratio, stirring, casting into molds and curing.

[0026] This invention addresses the challenges and high costs associated with the large-scale, high-value utilization of retired wind turbine blades by adding fragments of decommissioned wind turbine blades to cement products. This reduces production costs for cement companies without causing new pollution, thus lowering carbon emissions from cement manufacturing and providing a new approach for the large-scale, high-value utilization of decommissioned wind turbine blades. Furthermore, the invention removes the surface coating of decommissioned wind turbine blades during pretreatment and adds fragments of the blade matrix containing glass fiber as aggregate to the cement products. This fully utilizes the high toughness of recycled glass fiber, enhancing the mechanical strength of the cement products.

[0027] 2. The present invention provides a method for preparing cement products of decommissioned wind turbine blades, which uses mechanical ultrasonic vibration combined with water vibration dispersion to remove the surface coating of decommissioned wind turbine blades. This allows the cement slurry to directly wet and firmly wrap each fiber, forming a strong interfacial bonding force, thereby enabling the fibers to effectively transfer loads and truly play the role of "strengthening and toughening". Detailed Implementation

[0028] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0029] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0030] The standard sand used in this invention is the ISO standard sand for cement (GB / T 17671-2021).

[0031] Example 1

[0032] This embodiment discloses a method for preparing cement products for decommissioned wind turbine blades, including:

[0033] Pre-treatment of decommissioned wind turbine blades: Remove the metal connectors from the decommissioned wind turbine blades, and then use mechanical ultrasonic vibration (vibration frequency of 100kHz) combined with water vibration (jet of 2.5m / s) dispersion method to remove the surface coating.

[0034] Decommissioned wind turbine blade crushing: Remove the glass fiber-containing blade matrix from the decommissioned wind turbine blades, cut it into pieces smaller than 50mm, use a hammer crusher to crush the pieces into 10-20mm particles, and then use a disc grinder to separate the glass fibers, controlling the fiber length to be 0.5-8mm and the particle size to be 15um.

[0035] Composite molding: The cement paste raw materials include, by mass, 90% commercially available ordinary Portland cement, 5% slag, and 5% fly ash; 4% of decommissioned wind turbine blade fragments by mass of the cement paste raw materials are added to the cement paste raw materials and mixed evenly to obtain a premix; with a water-cement ratio of 0.3, referring to the test methods specified in JGJ / T 70-2009 "Basic Performance Test Methods for Building Mortar" and DL / T5126-2001 "Test Procedures for Polymer Modified Cement Mortar", first, the weighed water is put into the mixing pot, then the weighed premix is ​​put into the mixing pot and stirred evenly with a stirring rod (1 min), and finally, standard sand is added, the mass of which is twice that of the cement paste raw materials, and slowly stirred for 2 min until the mortar is uniform; then the mortar is poured into a mold (40mm×40mm×160mm), cured in a standard curing room (temperature 20℃, humidity 90%RH) for 24 hours, demolded and numbered, and continued standard curing.

[0036] Example 2

[0037] This embodiment discloses a method for preparing cement products for decommissioned wind turbine blades, including:

[0038] Pre-treatment of decommissioned wind turbine blades: Remove the metal connectors from the decommissioned wind turbine blades, and then use mechanical ultrasonic vibration (vibration frequency of 100kHz) combined with water vibration (jet of 2.5m / s) dispersion method to remove the surface coating.

[0039] Decommissioned wind turbine blade crushing: Remove the glass fiber-containing blade matrix from the decommissioned wind turbine blades, cut it into pieces smaller than 50mm, use a hammer crusher to crush the pieces into 10-20mm particles, and then use a disc grinder to separate the glass fibers, controlling the fiber length to be 0.5-8mm and the particle size to be 15um.

[0040] Composite molding: The cement paste raw materials include, by mass, 80% commercially available sulfoaluminate cement, 10% slag, and 10% fly ash; 4% of the total mass of decommissioned wind turbine blade fragments are added to the cement paste raw materials and mixed evenly to obtain a premix; with a water-cement ratio of 0.4, referring to the test methods specified in JGJ / T 70-2009 "Basic Performance Test Methods for Building Mortar" and DL / T5126-2001 "Test Procedures for Polymer Modified Cement Mortar", first, the weighed water is put into the mixing pot, then the weighed premix is ​​put into the mixing pot and stirred evenly with a stirring rod (1 min), and finally, standard sand is added, the mass of which is twice that of the cement paste raw materials, and slowly stirred for 2 min until the mortar is uniform; then the mortar is poured into a mold (40mm×40mm×160mm), cured in a standard curing room (temperature 20℃, humidity 90%RH) for 24 hours, demolded and numbered, and continued standard curing.

[0041] Example 3

[0042] This embodiment discloses a method for preparing cement products for decommissioned wind turbine blades, including:

[0043] Pre-treatment of decommissioned wind turbine blades: Remove the metal connectors from the decommissioned wind turbine blades, and then use mechanical ultrasonic vibration (vibration frequency of 100kHz) combined with water vibration (jet of 2.5m / s) dispersion method to remove the surface coating.

[0044] Decommissioned wind turbine blade crushing: Remove the glass fiber-containing blade matrix from the decommissioned wind turbine blades, cut it into pieces smaller than 50mm, use a hammer crusher to crush the pieces into 10-20mm particles, and then use a disc grinder to separate the glass fibers, controlling the fiber length to be 0.5-8mm and the particle size to be 30um.

[0045] Composite molding: The cement paste raw materials include, by mass, 90% commercially available ordinary Portland cement, 5% slag, and 5% fly ash; 4% of decommissioned wind turbine blade fragments by mass of the cement paste raw materials are added to the cement paste raw materials and mixed evenly to obtain a premix; with a water-cement ratio of 0.3, referring to the test methods specified in JGJ / T 70-2009 "Basic Performance Test Methods for Building Mortar" and DL / T5126-2001 "Test Procedures for Polymer Modified Cement Mortar", first, the weighed water is put into the mixing pot, then the weighed premix is ​​put into the mixing pot and stirred evenly with a stirring rod (1 min), and finally, standard sand is added, the mass of which is twice that of the cement paste raw materials, and slowly stirred for 2 min until the mortar is uniform; then the mortar is poured into a mold (40mm×40mm×160mm), cured in a standard curing room (temperature 20℃, humidity 90%RH) for 24 hours, demolded and numbered, and continued standard curing.

[0046] Example 4

[0047] This embodiment discloses a method for preparing cement products for decommissioned wind turbine blades, including:

[0048] Pre-treatment of decommissioned wind turbine blades: Remove the metal connectors from the decommissioned wind turbine blades, and then use mechanical ultrasonic vibration (vibration frequency of 100kHz) combined with water vibration (jet of 2.5m / s) dispersion method to remove the surface coating.

[0049] Decommissioned wind turbine blade crushing: Remove the glass fiber-containing blade matrix from the decommissioned wind turbine blades, cut it into pieces smaller than 50mm, use a hammer crusher to crush the pieces into 10-20mm particles, and then use a disc grinder to separate the glass fibers, controlling the fiber length to be 0.5-8mm and the particle size to be 30um.

[0050] Composite molding: The cement paste raw materials include, by mass, 90% commercially available sulfoaluminate cement, 5% slag, and 5% fly ash; 4% of decommissioned wind turbine blade fragments by mass of the cement paste raw materials are added to the cement paste raw materials and mixed evenly to obtain a premix; with a water-cement ratio of 0.4, referring to the test methods specified in JGJ / T 70-2009 "Basic Performance Test Methods for Building Mortar" and DL / T5126-2001 "Test Procedures for Polymer Modified Cement Mortar", first, the weighed water is put into the mixing pot, then the weighed premix is ​​put into the mixing pot and stirred evenly with a stirring rod (1 min), and finally, standard sand is added, the mass of which is twice that of the cement paste raw materials, and slowly stirred for 2 min until the mortar is uniform; then the mortar is poured into a mold (40mm×40mm×160mm), cured in a standard curing room (temperature 20℃, humidity 90%RH) for 24 hours, demolded and numbered, and continued standard curing.

[0051] Example 5

[0052] This embodiment discloses a method for preparing cement products for decommissioned wind turbine blades, including:

[0053] Pre-treatment of decommissioned wind turbine blades: Remove the metal connectors from the decommissioned wind turbine blades, and then use mechanical ultrasonic vibration (vibration frequency of 100kHz) combined with water vibration (jet of 2.5m / s) dispersion method to remove the surface coating.

[0054] Decommissioned wind turbine blade crushing: Remove the glass fiber-containing blade matrix from the decommissioned wind turbine blades, cut it into pieces smaller than 50mm, use a hammer crusher to crush the pieces into 10-20mm particles, and then use a disc grinder to separate the glass fibers, controlling the fiber length to be 0.5-8mm and the particle size to be 15um.

[0055] Composite molding: The cement paste raw materials include, by mass, 90% commercially available ordinary Portland cement, 5% slag, and 5% fly ash; 8% of the total mass of the cement paste raw materials, decommissioned wind turbine blade fragments are added to the cement paste raw materials and mixed evenly to obtain a premix; with a water-cement ratio of 0.3, referring to the test methods specified in JGJ / T 70-2009 "Basic Performance Test Methods for Building Mortar" and DL / T5126-2001 "Test Procedures for Polymer Modified Cement Mortar", first, the weighed water is put into the mixing pot, then the weighed premix is ​​put into the mixing pot and stirred evenly with a stirring rod (1 min), and finally, standard sand is added, the mass of which is twice that of the cement paste raw materials, and slowly stirred for 2 min until the mortar is uniform; then the mortar is poured into a mold (40mm×40mm×160mm), cured in a standard curing room (temperature 20℃, humidity 90%RH) for 24 hours, demolded and numbered, and continued standard curing.

[0056] Example 6

[0057] This embodiment discloses a method for preparing cement products for decommissioned wind turbine blades, including:

[0058] Pre-treatment of decommissioned wind turbine blades: Remove the metal connectors from the decommissioned wind turbine blades, and then use mechanical ultrasonic vibration (vibration frequency of 100kHz) combined with water vibration (jet of 2.5m / s) dispersion method to remove the surface coating.

[0059] Decommissioned wind turbine blade crushing: Remove the glass fiber-containing blade matrix from the decommissioned wind turbine blades, cut it into pieces smaller than 50mm, use a hammer crusher to crush the pieces into 10-20mm particles, and then use a disc grinder to separate the glass fibers, controlling the fiber length to be 0.5-8mm and the particle size to be 15um.

[0060] Composite molding: The cement paste raw materials include, by mass, 80% commercially available sulfoaluminate cement, 10% slag, and 10% fly ash; 8% of the total mass of decommissioned wind turbine blade fragments are added to the cement paste raw materials and mixed evenly to obtain a premix; with a water-cement ratio of 0.3, referring to the test methods specified in JGJ / T 70-2009 "Basic Performance Test Methods for Building Mortar" and DL / T5126-2001 "Test Procedures for Polymer Modified Cement Mortar", first, the weighed water is put into the mixing pot, then the weighed premix is ​​put into the mixing pot and stirred evenly with a stirring rod (1 min), and finally, standard sand is added, the mass of which is twice that of the cement paste raw materials, and slowly stirred for 2 min until the mortar is uniform; then the mortar is poured into a mold (40mm×40mm×160mm), cured in a standard curing room (temperature 20℃, humidity 90%RH) for 24 hours, demolded and numbered, and continued standard curing.

[0061] Example 7

[0062] This embodiment discloses a method for preparing cement products for decommissioned wind turbine blades, including:

[0063] Pre-treatment of decommissioned wind turbine blades: Remove the metal connectors from the decommissioned wind turbine blades, and then use mechanical ultrasonic vibration (vibration frequency of 100kHz) combined with water vibration (jet of 2.5m / s) dispersion method to remove the surface coating.

[0064] Decommissioned wind turbine blade crushing: Remove the glass fiber-containing blade matrix from the decommissioned wind turbine blades, cut it into pieces smaller than 50mm, use a hammer crusher to crush the pieces into 10-20mm particles, and then use a disc grinder to separate the glass fibers, controlling the fiber length to be 0.5-8mm and the particle size to be 30um.

[0065] Composite molding: The cement paste raw materials include, by mass, 90% commercially available ordinary Portland cement, 5% slag, and 5% fly ash; 8% of the total mass of the cement paste raw materials, decommissioned wind turbine blade fragments are added to the cement paste raw materials and mixed evenly to obtain a premix; with a water-cement ratio of 0.3, referring to the test methods specified in JGJ / T 70-2009 "Basic Performance Test Methods for Building Mortar" and DL / T5126-2001 "Test Procedures for Polymer Modified Cement Mortar", first, the weighed water is put into the mixing pot, then the weighed premix is ​​put into the mixing pot and stirred evenly with a stirring rod (1 min), and finally, standard sand is added, the mass of which is twice that of the cement paste raw materials, and slowly stirred for 2 min until the mortar is uniform; then the mortar is poured into a mold (40mm×40mm×160mm), cured in a standard curing room (temperature 20℃, humidity 90%RH) for 24 hours, demolded and numbered, and continued standard curing.

[0066] Example 8

[0067] This embodiment discloses a method for preparing cement products for decommissioned wind turbine blades, including:

[0068] Pre-treatment of decommissioned wind turbine blades: Remove the metal connectors from the decommissioned wind turbine blades, and then use mechanical ultrasonic vibration (vibration frequency of 100kHz) combined with water vibration (jet of 2.5m / s) dispersion method to remove the surface coating.

[0069] Decommissioned wind turbine blade crushing: Remove the glass fiber-containing blade matrix from the decommissioned wind turbine blades, cut it into pieces smaller than 50mm, use a hammer crusher to crush the pieces into 10-20mm particles, and then use a disc grinder to separate the glass fibers, controlling the fiber length to be 0.5-8mm and the particle size to be 30um.

[0070] Composite molding: The cement paste raw materials include, by mass, 90% commercially available sulfoaluminate cement, 5% slag, and 5% fly ash; 4% of decommissioned wind turbine blade fragments by mass of the cement paste raw materials are added to the cement paste raw materials and mixed evenly to obtain a premix; with a water-cement ratio of 0.3, referring to the test methods specified in JGJ / T 70-2009 "Basic Performance Test Methods for Building Mortar" and DL / T5126-2001 "Test Procedures for Polymer Modified Cement Mortar", first, the weighed water is put into the mixing pot, then the weighed premix is ​​put into the mixing pot and stirred evenly with a stirring rod (1 min), and finally, standard sand is added, the mass of which is twice that of the cement paste raw materials, and slowly stirred for 2 min until the mortar is uniform; then the mortar is poured into a mold (40mm×40mm×160mm), cured in a standard curing room (temperature 20℃, humidity 90%RH) for 24 hours, demolded and numbered, and continued standard curing.

[0071] Comparative Example 1

[0072] A method for preparing a cement product, comprising:

[0073] The cement paste raw materials include, by mass, 90% commercially available ordinary Portland cement, 5% slag, and 5% fly ash, mixed to prepare a premix. Using a water-cement ratio of 0.3, and referring to the test methods specified in JGJ / T 70-2009 "Basic Performance Test Methods for Building Mortar" and DL / T 5126-2001 "Test Procedures for Polymer-Modified Cement Mortar", first, weighed water is placed in a mixing pot, then the weighed premix is ​​added and stirred with a stirring rod (1 min) until uniform. Finally, standard sand is added, with a mass twice that of the cement paste raw materials, and the mixture is slowly stirred for 2 min until the mortar is uniform. The mortar is then poured into a mold (40mm×40mm×160mm) and cured in a standard curing room (temperature 20℃, humidity 90%RH) for 24 hours. The mold is then removed, the mold is numbered, and standard curing continues.

[0074] Comparative Example 2

[0075] A method for preparing cement products of decommissioned wind turbine blades, comprising:

[0076] Pre-treatment of decommissioned wind turbine blades: Remove metal connectors from decommissioned wind turbine blades.

[0077] Decommissioned wind turbine blade crushing: The decommissioned wind turbine blades are cut into pieces smaller than 50mm. A hammer crusher is used to crush the pieces into 10-20mm particles, and then a disc mill is used to separate them, controlling the particle size of the decommissioned wind turbine blade fragments to 15um.

[0078] Composite molding: The cement paste raw materials include, by mass, 90% commercially available ordinary Portland cement, 5% slag, and 5% fly ash; 4% of decommissioned wind turbine blade fragments by mass of the cement paste raw materials are added to the cement paste raw materials and mixed evenly to obtain a premix; with a water-cement ratio of 0.3, referring to the test methods specified in JGJ / T 70-2009 "Basic Performance Test Methods for Building Mortar" and DL / T5126-2001 "Test Procedures for Polymer Modified Cement Mortar", first, the weighed water is put into the mixing pot, then the weighed premix is ​​put into the mixing pot and stirred evenly with a stirring rod (1 min), and finally, standard sand is added, the mass of which is twice that of the cement paste raw materials, and slowly stirred for 2 min until the mortar is uniform; then the mortar is poured into a mold (40mm×40mm×160mm), cured in a standard curing room (temperature 20℃, humidity 90%RH) for 24 hours, demolded and numbered, and continued standard curing.

[0079] Test case

[0080] The cement mortar samples prepared based on decommissioned wind turbine blades obtained in Examples 1-8 and Comparative Examples 1-2 were cured in a molded state at 20°C and constant humidity for 1 day before being demolded and tested for flexural and compressive strength. The remaining demolded specimens were further cured in a constant humidity state at 20°C for 3 days, 7 days and 28 days, and tested for flexural and compressive strength.

[0081] The flexural and compressive strengths of cement samples prepared from decommissioned wind turbine blades obtained in Examples 1-8 and Comparative Examples 1-2 are shown in Table 1.

[0082] Table 1. Flexural and compressive strengths of cement product samples prepared from decommissioned wind turbine blades.

[0083]

[0084] A comparison of Examples 1-4 with Comparative Example 1 revealed that the mechanical properties of cement samples made primarily from silicate cement were significantly improved after adding wind turbine blade fragments with the surface coating removed. This is because adding glass fiber-containing blade matrix fragments from retired wind turbine blades as aggregate to cement products fully utilizes the high toughness of recycled glass fibers, enhancing the mechanical strength of the cement products. A comparison of Examples 1-4 with Comparative Example 2 showed that directly adding crushed wind turbine blade fragments as aggregate to cement products without removing the surface coating did not improve their mechanical properties. A comparison of Comparative Example 1 with Comparative Example 2 revealed that directly adding crushed wind turbine blade fragments as aggregate to cement products without removing the surface coating actually reduced their mechanical properties.

[0085] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing cement products of decommissioned wind turbine blades, characterized in that, Includes the following steps: Pre-treatment of decommissioned wind turbine blades: Remove metal connectors and remove the surface coating of decommissioned wind turbine blades; Crushing of decommissioned wind turbine blades: Take the blade matrix containing glass fiber from the decommissioned wind turbine blades and crush it; Composite molding: The crushed scraps of retired wind turbine blades are mixed into cement slurry according to the mass ratio, stirred, poured into molds, and cured.

2. The preparation method according to claim 1, characterized in that, In the pretreatment of decommissioned wind turbine blades, the removal of the surface coating specifically involves using a combination of mechanical ultrasonic vibration and water vibration dispersion to remove the surface coating of the decommissioned wind turbine blades.

3. The preparation method according to claim 1, characterized in that, The shredding of decommissioned wind turbine blades includes the following steps: The glass fiber-containing blade matrix from retired wind turbine blades is cut, crushed, and ground.

4. The preparation method according to claim 3, characterized in that, The particle size of the decommissioned wind turbine blades after crushing is 15-30 μm.

5. The preparation method according to claim 1, characterized in that, In the composite molding process, the cement paste raw material components, by mass parts, include: 80%-90% cement clinker, 5%-10% slag, and 5%-10% fly ash. The cement clinker includes any one of silicate cement and sulfoaluminate cement.

6. The preparation method according to claim 1, characterized in that, The composite molding step includes: The scrap of decommissioned wind turbine blades is mixed with cement slurry raw materials to obtain a premix; Mix the premix with water at a water-to-binder ratio of 0.3-0.4 until homogeneous; Add standard sand, with a mass ratio of standard sand to cement paste raw material of 1:2, and continue stirring to obtain mortar; The mortar is poured into molds and then cured.

7. The preparation method according to claim 6, characterized in that, The mass of the decommissioned wind turbine blade fragments is 4-8% of the mass of the cement slurry raw materials.

8. The preparation method according to claim 6, characterized in that, The stirring is performed by stirring the slurry with a stirring rod for 3-5 minutes.

9. The preparation method according to claim 6, characterized in that, The maintenance conditions are: temperature 20℃, humidity 90%RH.

10. A cement product for decommissioned wind turbine blades, characterized in that, It is prepared by the preparation method according to any one of claims 1-9.

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