An additive obtained by modifying glass fiber in wind turbine blades and concrete using the additive.

Abstract

An additive obtained by modifying fiberglass wind turbine blades and concrete using the additive are prepared according to the following steps: Raw material acquisition: Obtain fiberglass wind turbine blades and perform low-temperature pulverization to obtain raw material particles; Surface modification: Thoroughly mix the raw material particles, phosphoric acid, and urea peroxide, and heat and stir to obtain a mixture; Auxiliary pulverization: Mix the mixture with cement, water, and redispersible latex powder, cure and then crush to obtain the additive. This application, through the self-modification of the fiberglass material of wind turbine blades and mixing and pulverizing it with cement and redispersible latex powder, enables the glass fiber and resin materials inside the blade to better integrate into the cement-based material. When used as an additive for cement concrete, it can avoid agglomeration and better disperse in the cement concrete matrix, thereby improving the impermeability and frost resistance of cement concrete.

Description

Technical Field

[0001] This application relates to an additive obtained by modifying glass fiber in wind turbine blades and concrete using the additive. Background Technology

[0002] my country's wind power industry has developed rapidly, with a surge in the number of wind power bases. However, due to the limited lifespan of wind turbine blades, a large number of waste wind turbine blades are generated after retirement, requiring recycling. Therefore, the systematic and high-value recycling of waste wind turbine blades is urgently needed. Currently, simple methods such as incineration, landfill, and stockpiling are commonly used for recycling. While these methods are low-cost, they cause serious pollution. Another method involves removing the resin from the waste blades to obtain glass fiber. This method has the advantage of recovering some materials, but its disadvantages are more pronounced. It still requires high-temperature treatment, the recycling process is complex, and the final recycling cost is not low.

[0003] Therefore, it is necessary to improve the recycling and reuse process of fiberglass wind turbine blades. Summary of the Invention

[0004] To address the aforementioned problems, this application proposes an additive obtained from the modification of glass fiber pulverization in wind turbine blades, prepared according to the following steps:

[0005] Raw material acquisition:

[0006] Fiberglass wind turbine blades were obtained, and the fiberglass wind turbine blades were subjected to low-temperature pulverization to obtain raw material particles;

[0007] Surface modification:

[0008] The raw material particles, phosphoric acid, and urea peroxide are thoroughly mixed and heated to react and obtain a mixed solution.

[0009] Assisted grinding:

[0010] The mixture is combined with cement, water, and redispersible latex powder, cured, and then crushed to obtain the additive. This application first modifies the fiberglass material of the wind turbine blade, then mixes and crushes it with cement and redispersible latex powder. Based on surface modification of the raw material particles, the redispersible latex powder is used to further process the particles, allowing the glass fiber and resin materials inside the blade to better integrate into the cement-based material. When used as an additive in cement concrete, it avoids agglomeration and better disperses within the cement concrete matrix, thus improving the impermeability and frost resistance of the cement concrete.

[0011] Preferably, the low-temperature pulverization is performed in the following manner:

[0012] First, the fiberglass wind turbine blades are cut into blade strips;

[0013] The blade-shaped material is placed in a low-temperature blade pulverizer, with an operating temperature of -80 to 50°C and a pulverizing time of 20 to 30 minutes to obtain primary pulverized material.

[0014] The primary pulverized material is sieved to obtain undersize particles with a particle size of less than 50 mesh, which are used as raw material particles. In order to maintain the performance of the wind turbine blade material after pretreatment, this application adopts a low-temperature pulverization method for the blade strips. This method has a good promoting effect on maintaining the compactness of the glass fiber powder on the cement-based material and the hydrophobic and impermeable properties of the resin on the cement-based material.

[0015] Preferably, the length of the blade strip does not exceed 10 mm and the cross-sectional area does not exceed 5 mm². 2 .

[0016] Preferably, the surface modification is performed in the following manner:

[0017] Place 2-4 parts by weight of urea peroxide in 40-50 parts by weight of phosphoric acid aqueous solution;

[0018] Then add 10-20 parts by weight of the raw material particles to obtain the reaction solution;

[0019] Under sealed and continuous stirring conditions, the temperature is heated to 75-85℃ and maintained for 2-3 hours, then cooled to room temperature to obtain a mixture.

[0020] Preferably, the phosphoric acid content in the phosphoric acid aqueous solution is 50-65 wt%.

[0021] Preferably, the auxiliary crushing is performed in the following manner:

[0022] Mix 80-100 parts of liquid mixture, 20-25 parts of cement, 2-4 parts of redispersible latex powder, and 10-20 parts of water thoroughly, then pour, demold, and cure for no less than 7 days to obtain cement composite blocks.

[0023] The cement composite blocks are initially crushed, then finely crushed, and sieved to obtain 50-300 mesh particles, which are used as additives. The redispersible latex powder is VAE redispersible latex powder. In this application, a mixture containing phosphoric acid and surface-treated raw material particles is premixed with cement and redispersible latex powder. Based on achieving uniform dispersion of the raw material particles, the raw material particles are then crushed a second time. When used as an additive for cement concrete, this improves the density of the concrete and enhances the impermeability and frost resistance of the material.

[0024] Preferably, the cement used in the auxiliary crushing process is silicate cement with a grade of 32.5.

[0025] Preferably, the preliminary crushing is performed using a jaw crusher;

[0026] The precision crushing is carried out as follows: the cement composite block that has been pre-crushed is placed into a low-temperature blade crusher, the operating temperature is -80 to -50℃, and the crushing time is 40 to 60 minutes.

[0027] On the other hand, a concrete using an additive obtained by pulverizing and modifying fiberglass wind turbine blades is proposed, comprising the following raw materials in parts by weight:

[0028] Additives: 20-30 parts;

[0029] Cement: 320-360 parts;

[0030] Fly ash: 30-50 parts;

[0031] Fine aggregate: 750-800 parts;

[0032] Coarse aggregate: 1000-1100 parts;

[0033] Water; 200-240 servings.

[0034] Preferably, the fine aggregate is river sand; the coarse aggregate is crushed stone.

[0035] This application can bring the following beneficial effects:

[0036] 1. This application first modifies the glass fiber material of the wind turbine blade itself, and then mixes and crushes it with cement and redispersible latex powder. Based on the surface modification of the raw material particles, the redispersible latex powder is used to further process the raw material particles, so that the glass fiber and resin material inside the blade can be better integrated into the cement-based material. When used as an additive for cement concrete, it can avoid agglomeration and better disperse in the cement concrete matrix, thereby improving the impermeability and frost resistance of cement concrete.

[0037] 2. In order to maintain the performance of wind turbine blade materials after pretreatment, this application adopts a low-temperature pulverization method for the blade strips. This has a good promoting effect on maintaining the density of glass fiber powder on cement-based materials and the hydrophobic and impermeable properties of resin on cement-based materials.

[0038] 3. In this application, a mixture containing phosphoric acid and surface-treated raw material particles is premixed with cement and redispersible latex powder. On the basis of achieving uniform dispersion of raw material particles, the raw material particles are pulverized a second time. When used as an additive for cement concrete, it not only improves the density of concrete, but also enhances the impermeability and frost resistance of concrete. Detailed Implementation

[0039] To clearly illustrate the technical features of this solution, the following detailed description of specific implementation methods will be provided.

[0040] This application discloses an additive obtained by modifying glass fiber in wind turbine blades and its use in concrete. The additive is prepared according to the following steps:

[0041] S1 Raw Material Acquisition:

[0042] Fiberglass wind turbine blades were obtained, and the fiberglass wind turbine blades were subjected to low-temperature pulverization to obtain raw material particles;

[0043] Low-temperature pulverization is carried out as follows:

[0044] First, the fiberglass wind turbine blades are cut into blade strips; the length of the blade strips does not exceed 10mm and the cross-sectional area does not exceed 5mm². 2 ;

[0045] The blade-shaped material is placed in a low-temperature blade pulverizer, with an operating temperature of -80 to 50°C and a pulverizing time of 20 to 30 minutes to obtain primary pulverized material.

[0046] The primary pulverized material is sieved to obtain undersize material with a particle size of less than 50 mesh, which is used as raw material particles.

[0047] S2 surface modification:

[0048] The raw material particles, phosphoric acid, and urea peroxide are thoroughly mixed and heated to react and obtain a mixed solution.

[0049] The specific procedure is as follows:

[0050] Place 2-4 parts by weight of urea peroxide in 40-50 parts by weight of an aqueous solution of phosphoric acid with a phosphoric acid content of 50-65 wt%;

[0051] Then add 10-20 parts by weight of the raw material particles to obtain the reaction solution;

[0052] Under sealed and continuous stirring conditions, the temperature is heated to 75-85℃ and maintained for 2-3 hours, then cooled to room temperature to obtain a mixture.

[0053] S3 auxiliary crushing:

[0054] The additive is obtained by mixing the mixture with cement, water, and redispersible latex powder, curing it into shape, and then crushing it.

[0055] The specific procedure is as follows:

[0056] Mix 80-100 parts of the liquid mixture, 20-25 parts of cement (32.5 grade silicate cement), 2-4 parts of redispersible latex powder, and 10-20 parts of water thoroughly, then pour, demold, and cure for no less than 7 days to obtain cement composite blocks.

[0057] The cement composite blocks are initially crushed, then finely crushed, and sieved to obtain 50-300 mesh particles as additives; the redispersible latex powder is VAE redispersible latex powder.

[0058] The initial crushing is performed using a jaw crusher;

[0059] The precision crushing is carried out as follows: the cement composite block that has been pre-crushed is placed into a low-temperature blade crusher, the operating temperature is -80 to -50℃, and the crushing time is 40 to 60 minutes.

[0060] Preparation of S4 concrete:

[0061] To obtain concrete, the following parts by weight of raw materials are mixed and stirred:

[0062] Additives: 20-30 parts;

[0063] Cement: 320-360 parts;

[0064] Fly ash: 30-50 parts;

[0065] Fine aggregate: 750-800 parts;

[0066] Coarse aggregate: 1000-1100 parts;

[0067] Water; 200-240 servings.

[0068] The fine aggregate is river sand; the coarse aggregate is crushed stone.

[0069] To demonstrate its effectiveness, the following examples are provided to prove the effectiveness of the wind turbine blade-based additive prepared in this application in concrete applications. For concrete properties, the slump of the concrete was determined according to GB / T50080-2016 "Standard for Test Methods of Performance of Ordinary Concrete Mixtures"; the compressive strength of the concrete was determined according to GB / T50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete"; and the frost resistance and impermeability of the concrete were determined according to GB / T50082-2024 "Standard for Test Methods of Long-Term Performance and Durability of Concrete".

[0070] Example 1:

[0071] S101 Raw Material Acquisition:

[0072] Fiberglass wind turbine blades were obtained, and the fiberglass wind turbine blades were subjected to low-temperature pulverization to obtain raw material particles;

[0073] Low-temperature pulverization is carried out as follows:

[0074] First, the fiberglass wind turbine blades are cut into blade strips; the length of the blade strips does not exceed 10mm and the cross-sectional area does not exceed 5mm². 2 ;

[0075] The blade-shaped material is placed in a low-temperature blade pulverizer, the operating temperature is -80℃, and the pulverizing time is 20 minutes to obtain the primary pulverized material;

[0076] The primary pulverized material is sieved to obtain undersize material with a particle size of less than 50 mesh, which is used as raw material particles.

[0077] S102 Surface Modification:

[0078] The raw material particles, phosphoric acid, and urea peroxide are thoroughly mixed and heated to react and obtain a mixed solution.

[0079] The specific procedure is as follows:

[0080] Two parts by mass of urea peroxide were placed in 40 parts by mass of an aqueous solution of phosphoric acid with a phosphoric acid content of 65 wt%.

[0081] Then add 10 parts by weight of the raw material particles to obtain the reaction solution;

[0082] Under sealed and continuous stirring conditions, the temperature is heated to 75°C and maintained for 3 hours, then cooled to room temperature to obtain a mixture.

[0083] S103 auxiliary crushing:

[0084] The additive is obtained by mixing the mixture with cement, water, and redispersible latex powder, curing it into shape, and then crushing it.

[0085] The specific procedure is as follows:

[0086] Mix 80 parts of the liquid mixture, 20 parts of cement (32.5 grade silicate cement), 2 parts of VAE redispersible latex powder, and 10 parts of water thoroughly, then pour, demold, and cure for 7 days to obtain cement composite blocks.

[0087] The cement composite blocks are initially crushed, then finely crushed, and sieved to obtain 50-300 mesh particles, which are then used as additives.

[0088] The initial crushing is performed using a jaw crusher;

[0089] The precision crushing is carried out as follows: the cement composite block that has been pre-crushed is placed into a low-temperature blade crusher, the operating temperature is -80℃, and the crushing time is 40 minutes.

[0090] Preparation of S104 concrete:

[0091] To obtain concrete, the following parts by weight of raw materials are mixed and stirred:

[0092] Additives: 20 parts;

[0093] 320 parts of silicate cement with a grade of 42.5;

[0094] Fly ash: 30 parts;

[0095] Fine aggregate (river sand): 750 parts;

[0096] Coarse aggregate (crushed stone): 1000 parts;

[0097] Water; 200 servings.

[0098] The slump of concrete was determined using a slump cone.

[0099] The prepared concrete was poured into a mold and compacted on a vibrating table. After curing for 24 hours, it was demolded and then cured for another 28 days to obtain a standard concrete sample. The compressive strength, frost resistance and impermeability of the concrete were then measured.

[0100] After testing, the concrete slump was 200mm, the compressive strength was 44.6MPa, the frost resistance grade was F150, and the impermeability grade was P10.

[0101] Example 2:

[0102] S201 Raw Material Acquisition:

[0103] Fiberglass wind turbine blades were obtained, and the fiberglass wind turbine blades were subjected to low-temperature pulverization to obtain raw material particles;

[0104] Low-temperature pulverization is carried out as follows:

[0105] First, the fiberglass wind turbine blades are cut into blade strips; the length of the blade strips does not exceed 10mm and the cross-sectional area does not exceed 5mm². 2 ;

[0106] The blade-shaped material is placed in a low-temperature blade pulverizer, the operating temperature is -50℃, and the pulverizing time is 30 minutes to obtain the primary pulverized material;

[0107] The primary pulverized material is sieved to obtain undersize material with a particle size of less than 50 mesh, which is used as raw material particles.

[0108] S202 Surface Modification:

[0109] The raw material particles, phosphoric acid, and urea peroxide are thoroughly mixed and heated to react and obtain a mixed solution.

[0110] The specific procedure is as follows:

[0111] Four parts by mass of urea peroxide were placed in 50 parts by mass of an aqueous solution of phosphoric acid with a phosphoric acid content of 50 wt%.

[0112] Then add 20 parts by weight of the raw material particles to obtain the reaction solution;

[0113] Under sealed and continuous stirring conditions, the temperature is heated to 85°C and maintained for 2 hours, then cooled to room temperature to obtain a mixture.

[0114] S203 auxiliary pulverizer:

[0115] The additive is obtained by mixing the mixture with cement, water, and redispersible latex powder, curing it into shape, and then crushing it.

[0116] The specific procedure is as follows:

[0117] Mix 100 parts of the liquid mixture, 25 parts of cement (32.5 grade silicate cement), 4 parts of VAE redispersible latex powder, and 20 parts of water thoroughly, then pour, demold, and cure for 7 days to obtain cement composite blocks.

[0118] The cement composite blocks are initially crushed, then finely crushed, and sieved to obtain 50-300 mesh particles, which are then used as additives.

[0119] The initial crushing is performed using a jaw crusher;

[0120] The precision crushing is carried out as follows: the cement composite block that has been pre-crushed is placed into a low-temperature blade crusher, the operating temperature is -50℃, and the crushing time is 60 minutes.

[0121] Preparation of S204 concrete:

[0122] To obtain concrete, the following parts by weight of raw materials are mixed and stirred:

[0123] Additives: 30 parts;

[0124] 360 parts of silicate cement with a grade of 42.5;

[0125] Fly ash: 50 parts;

[0126] Fine aggregate (river sand): 800 parts;

[0127] Coarse aggregate (crushed stone): 1100 parts;

[0128] Water; 240 portions.

[0129] The slump of concrete was determined using a slump cone.

[0130] The prepared concrete was poured into a mold and compacted on a vibrating table. After curing for 24 hours, it was demolded and then cured for another 28 days to obtain a standard concrete sample. The compressive strength, frost resistance and impermeability of the concrete were then measured.

[0131] After testing, the concrete slump was 195mm, the compressive strength was 45.5MPa, the frost resistance grade was F150, and the impermeability grade was P10.

[0132] Comparative Example 1:

[0133] S301 Raw Material Acquisition:

[0134] Fiberglass wind turbine blades were obtained, and the fiberglass wind turbine blades were subjected to intermittent ball milling to obtain raw material particles;

[0135] Intermittent ball milling is performed as follows:

[0136] First, the fiberglass wind turbine blades are cut into blade strips; the length of the blade strips does not exceed 10mm and the cross-sectional area does not exceed 5mm². 2 ;

[0137] The blade strips were placed into a ball mill and subjected to intermittent ball milling, with each milling session lasting 30 seconds and followed by a 1-minute interval, for a total of 60 cycles.

[0138] The primary pulverized material is sieved to obtain undersize material with a particle size of less than 50 mesh, which is used as raw material particles.

[0139] S302 Surface Modification:

[0140] The raw material particles, phosphoric acid, and urea peroxide are thoroughly mixed and heated to react and obtain a mixed solution.

[0141] The specific procedure is as follows:

[0142] Two parts by mass of urea peroxide were placed in 40 parts by mass of an aqueous solution of phosphoric acid with a phosphoric acid content of 65 wt%.

[0143] Then add 10 parts by weight of the raw material particles to obtain the reaction solution;

[0144] Under sealed and continuous stirring conditions, the temperature is heated to 75°C and maintained for 3 hours, then cooled to room temperature to obtain a mixture.

[0145] S303 auxiliary crushing:

[0146] The additive is obtained by mixing the mixture with cement, water, and redispersible latex powder, curing it into shape, and then crushing it.

[0147] The specific procedure is as follows:

[0148] Mix 80 parts of the liquid mixture, 20 parts of cement (32.5 grade silicate cement), 2 parts of VAE redispersible latex powder, and 10 parts of water thoroughly, then pour, demold, and cure for 7 days to obtain cement composite blocks.

[0149] The cement composite blocks are initially crushed, then finely crushed, and sieved to obtain 50-300 mesh particles, which are then used as additives.

[0150] The initial crushing is performed using a jaw crusher;

[0151] The precision crushing is carried out as follows: the cement composite block that has been pre-crushed is placed into a low-temperature blade crusher, the operating temperature is -80℃, and the crushing time is 40 minutes.

[0152] Preparation of S304 concrete:

[0153] To obtain concrete, the following parts by weight of raw materials are mixed and stirred:

[0154] Additives: 20 parts;

[0155] 320 parts of silicate cement with a grade of 42.5;

[0156] Fly ash: 30 parts;

[0157] Fine aggregate (river sand): 750 parts;

[0158] Coarse aggregate (crushed stone): 1000 parts;

[0159] Water; 200 servings.

[0160] The slump of concrete was determined using a slump cone.

[0161] The prepared concrete was poured into a mold and compacted on a vibrating table. After curing for 24 hours, it was demolded and then cured for another 28 days to obtain a standard concrete sample. The compressive strength, frost resistance and impermeability of the concrete were then measured.

[0162] After testing, the concrete slump was 190mm, the compressive strength was 42.3MPa, the frost resistance grade was F100, and the impermeability grade was P8.

[0163] Comparative Example 2:

[0164] S401 Raw Material Acquisition:

[0165] Glass fibers with a length of less than 10 mm and a diameter of 17 μm were obtained, and the glass fibers were pulverized at low temperature to obtain raw material particles.

[0166] Low-temperature pulverization is carried out as follows:

[0167] Glass fiber is placed in a low-temperature blade pulverizer, the operating temperature is -80℃, and the pulverizing time is 20 minutes to obtain primary pulverized material;

[0168] The primary pulverized material is sieved to obtain undersize material with a particle size of less than 50 mesh, which is used as raw material particles.

[0169] S402 Surface Modification:

[0170] The raw material particles, phosphoric acid, and urea peroxide are thoroughly mixed and heated to react and obtain a mixed solution.

[0171] The specific procedure is as follows:

[0172] Two parts by mass of urea peroxide were placed in 40 parts by mass of an aqueous solution of phosphoric acid with a phosphoric acid content of 65 wt%.

[0173] Then add 10 parts by weight of the raw material particles to obtain the reaction solution;

[0174] Under sealed and continuous stirring conditions, the temperature is heated to 75°C and maintained for 3 hours, then cooled to room temperature to obtain a mixture.

[0175] S403 auxiliary crushing:

[0176] The additive is obtained by mixing the mixture with cement, water, and redispersible latex powder, curing it into shape, and then crushing it.

[0177] The specific procedure is as follows:

[0178] Mix 80 parts of the liquid mixture, 20 parts of cement (32.5 grade silicate cement), 2 parts of VAE redispersible latex powder, and 10 parts of water thoroughly, then pour, demold, and cure for 7 days to obtain cement composite blocks.

[0179] The cement composite blocks are initially crushed, then finely crushed, and sieved to obtain 50-300 mesh particles, which are then used as additives.

[0180] The initial crushing is performed using a jaw crusher;

[0181] The precision crushing is carried out as follows: the cement composite block that has been pre-crushed is placed into a low-temperature blade crusher, the operating temperature is -80℃, and the crushing time is 40 minutes.

[0182] Preparation of S404 concrete:

[0183] To obtain concrete, the following parts by weight of raw materials are mixed and stirred:

[0184] Additives: 20 parts;

[0185] 320 parts of silicate cement with a grade of 42.5;

[0186] Fly ash: 30 parts;

[0187] Fine aggregate (river sand): 750 parts;

[0188] Coarse aggregate (crushed stone): 1000 parts;

[0189] Water; 200 servings.

[0190] The slump of concrete was determined using a slump cone.

[0191] The prepared concrete was poured into a mold and compacted on a vibrating table. After curing for 24 hours, it was demolded and then cured for another 28 days to obtain a standard concrete sample. The compressive strength, frost resistance and impermeability of the concrete were then measured.

[0192] After testing, the concrete slump was 190mm, the compressive strength was 43.8MPa, the frost resistance grade was F100, and the impermeability grade was P6.

[0193] Comparative Example 3:

[0194] S501 Raw Material Acquisition:

[0195] Fiberglass wind turbine blades were obtained, and the fiberglass wind turbine blades were subjected to low-temperature pulverization to obtain raw material particles;

[0196] Low-temperature pulverization is carried out as follows:

[0197] First, the fiberglass wind turbine blades are cut into blade strips; the length of the blade strips does not exceed 10mm and the cross-sectional area does not exceed 5mm². 2 ;

[0198] The blade-shaped material is placed in a low-temperature blade pulverizer, the operating temperature is -80℃, and the pulverizing time is 20 minutes to obtain the primary pulverized material;

[0199] The primary pulverized material is sieved to obtain undersize material with a particle size of less than 50 mesh, which is used as raw material particles.

[0200] S502 Surface Modification:

[0201] The raw material particles, phosphoric acid, and urea peroxide are thoroughly mixed and heated to react and obtain a mixed solution.

[0202] The specific procedure is as follows:

[0203] Two parts by mass of urea peroxide were placed in 40 parts by mass of an aqueous solution of phosphoric acid with a phosphoric acid content of 65 wt%.

[0204] Then add 10 parts by weight of the raw material particles to obtain the reaction solution;

[0205] Under sealed and continuous stirring conditions, the temperature is heated to 75°C and maintained for 3 hours. The mixture is then cooled to room temperature to obtain a solution. The solution is then filtered and dried (at 80°C for 24 hours) to obtain the additive.

[0206] Preparation of S503 concrete:

[0207] To obtain concrete, the following parts by weight of raw materials are mixed and stirred:

[0208] Additives: 20 parts;

[0209] 320 parts of silicate cement with a grade of 42.5;

[0210] Fly ash: 30 parts;

[0211] Fine aggregate (river sand): 750 parts;

[0212] Coarse aggregate (crushed stone): 1000 parts;

[0213] Water; 200 servings.

[0214] The slump of concrete was determined using a slump cone.

[0215] The prepared concrete was poured into a mold and compacted on a vibrating table. After curing for 24 hours, it was demolded and then cured for another 28 days to obtain a standard concrete sample. The compressive strength, frost resistance and impermeability of the concrete were then measured.

[0216] After testing, the concrete slump was 195mm, the compressive strength was 41.8MPa, the frost resistance grade was F100, and the impermeability grade was P8.

[0217] Comparative Example 4:

[0218] S601 Raw Material Acquisition:

[0219] Fiberglass wind turbine blades were obtained, and the fiberglass wind turbine blades were subjected to low-temperature pulverization to obtain raw material particles;

[0220] Low-temperature pulverization is carried out as follows:

[0221] First, the fiberglass wind turbine blades are cut into blade strips; the length of the blade strips does not exceed 10mm and the cross-sectional area does not exceed 5mm². 2 ;

[0222] The blade-shaped material is placed in a low-temperature blade pulverizer, the operating temperature is -80℃, and the pulverizing time is 20 minutes to obtain the primary pulverized material;

[0223] The primary pulverized material is sieved to obtain undersize material with a particle size of less than 50 mesh, which is used as raw material particles.

[0224] S602 Surface Modification:

[0225] The raw material particles and phosphoric acid are thoroughly mixed and heated to obtain a mixed solution;

[0226] The specific procedure is as follows:

[0227] 10 parts by weight of raw material granules were added to 40 parts by weight of an aqueous solution of phosphoric acid with a phosphoric acid content of 65 wt%.

[0228] Under sealed and continuous stirring conditions, the temperature is heated to 75°C and maintained for 3 hours, then cooled to room temperature to obtain a mixture.

[0229] S603 auxiliary crushing:

[0230] The additive is obtained by mixing the mixture with cement, water, and redispersible latex powder, curing it into shape, and then crushing it.

[0231] The specific procedure is as follows:

[0232] Mix 80 parts of the liquid mixture, 20 parts of cement (32.5 grade silicate cement), 2 parts of VAE redispersible latex powder, and 10 parts of water thoroughly, then pour, demold, and cure for 7 days to obtain cement composite blocks.

[0233] The cement composite blocks are initially crushed, then finely crushed, and sieved to obtain 50-300 mesh particles, which are then used as additives.

[0234] The initial crushing is performed using a jaw crusher;

[0235] The precision crushing is carried out as follows: the cement composite block that has been pre-crushed is placed into a low-temperature blade crusher, the operating temperature is -80℃, and the crushing time is 40 minutes.

[0236] Preparation of S604 concrete:

[0237] To obtain concrete, the following parts by weight of raw materials are mixed and stirred:

[0238] Additives: 20 parts;

[0239] 320 parts of silicate cement with a grade of 42.5;

[0240] Fly ash: 30 parts;

[0241] Fine aggregate (river sand): 750 parts;

[0242] Coarse aggregate (crushed stone): 1000 parts;

[0243] Water; 200 servings.

[0244] The slump of concrete was determined using a slump cone.

[0245] The prepared concrete was poured into a mold and compacted on a vibrating table. After curing for 24 hours, it was demolded and then cured for another 28 days to obtain a standard concrete sample. The compressive strength, frost resistance and impermeability of the concrete were then measured.

[0246] After testing, the concrete slump was 195mm, the compressive strength was 42.1MPa, the frost resistance grade was F100, and the impermeability grade was P6.

[0247] Comparative Example 5:

[0248] S701 Raw Material Acquisition:

[0249] Fiberglass wind turbine blades were obtained, and the fiberglass wind turbine blades were subjected to low-temperature pulverization to obtain raw material particles;

[0250] Low-temperature pulverization is carried out as follows:

[0251] First, the fiberglass wind turbine blades are cut into blade strips; the length of the blade strips does not exceed 10mm and the cross-sectional area does not exceed 5mm². 2 ;

[0252] The blade-shaped material is placed in a low-temperature blade pulverizer, the operating temperature is -80℃, and the pulverizing time is 20 minutes to obtain the primary pulverized material;

[0253] The primary pulverized material is sieved to obtain undersize material with a particle size of less than 50 mesh, which is used as raw material particles.

[0254] S702 Surface Modification:

[0255] The raw material particles and urea peroxide are thoroughly mixed and heated to react and obtain a mixture.

[0256] The specific procedure is as follows:

[0257] Place 2 parts by weight of urea peroxide into 14 parts by weight of water;

[0258] Then add 10 parts by weight of the raw material particles to obtain the reaction solution;

[0259] Under sealed and continuous stirring conditions, the temperature is heated to 75°C and maintained for 3 hours, then cooled to room temperature to obtain a mixture.

[0260] S703 auxiliary crushing:

[0261] The additive is obtained by mixing the mixture with cement, water, and redispersible latex powder, curing it into shape, and then crushing it.

[0262] The specific procedure is as follows:

[0263] Mix 80 parts of the liquid mixture, 20 parts of cement (32.5 grade silicate cement), 2 parts of VAE redispersible latex powder, and 10 parts of water thoroughly, then pour, demold, and cure for 7 days to obtain cement composite blocks.

[0264] The cement composite blocks are initially crushed, then finely crushed, and sieved to obtain 50-300 mesh particles, which are then used as additives.

[0265] The initial crushing is performed using a jaw crusher;

[0266] The precision crushing is carried out as follows: the cement composite block that has been pre-crushed is placed into a low-temperature blade crusher, the operating temperature is -80℃, and the crushing time is 40 minutes.

[0267] Preparation of S704 concrete:

[0268] To obtain concrete, the following parts by weight of raw materials are mixed and stirred:

[0269] Additives: 20 parts;

[0270] 320 parts of silicate cement with a grade of 42.5;

[0271] Fly ash: 30 parts;

[0272] Fine aggregate (river sand): 750 parts;

[0273] Coarse aggregate (crushed stone): 1000 parts;

[0274] Water; 200 servings.

[0275] The slump of concrete was determined using a slump cone.

[0276] The prepared concrete was poured into a mold and compacted on a vibrating table. After curing for 24 hours, it was demolded and then cured for another 28 days to obtain a standard concrete sample. The compressive strength, frost resistance and impermeability of the concrete were then measured.

[0277] After testing, the concrete slump was 190mm, the compressive strength was 42.3MPa, the frost resistance grade was F100, and the impermeability grade was P8.

[0278] This application first modifies the glass fiber material of the wind turbine blade itself, and then mixes it with cement and redispersible latex powder. Based on the surface modification of the raw material particles, the redispersible latex powder is used to further process the raw material particles, so that the glass fiber and resin material inside the blade can be better integrated into the cement-based material. When used as an additive for cement concrete, it can avoid agglomeration and better disperse in the cement concrete matrix, which improves the density of the concrete and enhances its impermeability and frost resistance.

[0279] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An additive obtained by modifying glass fiber pulverized material in wind turbine blades, characterized in that: It is prepared according to the following steps: Raw material acquisition: Fiberglass wind turbine blades are obtained, and the fiberglass wind turbine blades are subjected to low-temperature pulverization to obtain raw material particles; the low-temperature pulverization temperature is -80 to -50℃. Surface modification: The raw material particles, phosphoric acid, and urea peroxide are thoroughly mixed and heated to react and obtain a mixed solution. The surface modification is carried out in the following manner: Place 2-4 parts by weight of urea peroxide in 40-50 parts by weight of phosphoric acid aqueous solution; Then add 10-20 parts by weight of the raw material particles to obtain the reaction solution; Under sealed and continuous stirring conditions, the temperature is heated to 75-85℃ and maintained for 2-3 hours, then cooled to room temperature to obtain a mixture; Assisted grinding: Mix 80-100 parts of liquid mixture, 20-25 parts of cement, 2-4 parts of redispersible latex powder, and 10-20 parts of water thoroughly, cure and mold, and then crush to obtain the additive.

2. The additive obtained by modifying glass fiber in wind turbine blades as described in claim 1, characterized in that: The low-temperature pulverization is performed in the following manner: First, the fiberglass wind turbine blades are cut into blade strips; The blade-shaped material is placed into a low-temperature blade pulverizer and pulverized for 20-30 minutes to obtain primary pulverized material. The primary pulverized material is sieved to obtain undersize material with a particle size of less than 50 mesh, which is used as raw material particles.

3. The additive obtained by modifying glass fiber in wind turbine blades as described in claim 2, characterized in that: The length of the blade-like strip does not exceed 10 mm, and the cross-sectional area does not exceed 5 mm². 2 .

4. The additive obtained by modifying glass fiber in wind turbine blades as described in claim 1, characterized in that: The phosphoric acid aqueous solution contains 50-65 wt% phosphoric acid.

5. The additive obtained by modifying glass fiber in wind turbine blades as described in claim 1, characterized in that: The auxiliary pulverization is carried out in the following manner: The mixture, cement, redispersible latex powder, and water are thoroughly mixed, then poured, demolded, and cured for at least 7 days to obtain a cement composite block. The cement composite blocks are initially crushed, then finely crushed, and sieved to obtain 50-300 mesh particles, which are then used as additives. The redispersible latex powder is VAE redispersible latex powder.

6. The additive obtained by modifying glass fiber in wind turbine blades as described in claim 5, characterized in that: The cement used in the auxiliary crushing process is silicate cement with a grade of 32.

5.

7. The additive obtained by modifying glass fiber in wind turbine blades as described in claim 5, characterized in that: The initial crushing is performed using a jaw crusher; The precision crushing is carried out as follows: the cement composite block that has been pre-crushed is placed into a low-temperature blade crusher, the operating temperature is -80 to -50℃, and the crushing time is 40 to 60 minutes.

8. A type of concrete prepared using an additive obtained by modifying wind turbine blade glass fiber as described in any one of claims 1-7, characterized in that: The raw materials include the following parts by weight: Additives: 20-30 parts; Cement: 320-360 parts; Fly ash: 30-50 parts; Fine aggregate: 750-800 parts; Coarse aggregate: 1000-1100 parts; Water; 200-240 servings.

9. The concrete as described in claim 8, characterized in that: The fine aggregate is river sand; the coarse aggregate is crushed stone.