High-performance concrete admixture composition for wind power tower drum and preparation method of high-performance concrete admixture composition

Abstract

The invention relates to a high-performance concrete admixture composition for a wind power tower drum and a preparation method of the high-performance concrete admixture composition, and relates to the field of concrete admixtures. The water reducing agent is prepared from the following components in parts by weight: 35 to 45 parts of a shrinkage reducing type polycarboxylic acid water reducing agent, 8 to 12 parts of methoxy polyethylene glycol acrylate modified nano silicon dioxide, 1.5 to 2.5 parts of sodium dodecyl polyoxyethylene ether sulfonate, 0.8 to 1.5 parts of coconut oil diethanolamide, 0.3 to 0.8 part of sodium polyacrylate, 0.2 to 0.6 part of ammonium tripolyphosphate, 0.05 to 0.15 part of a polyether defoaming agent and 40 to 50 parts of water. According to the invention, the hydration process of the concrete is regulated and controlled through the synergistic interaction among various additives, the pore structure in the concrete is optimized, and an interface transition region is strengthened, so that the systematic improvement of the microstructure of the concrete is realized, and the strength and durability of the concrete are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of concrete admixtures, and particularly to a high-performance concrete admixture composition for wind power tower barrels and a preparation method thereof. Background Art

[0002] In recent years, the wind power generation industry has developed rapidly. As a key component, the concrete used in wind power tower barrels has higher requirements for its performance, not only requiring high strength, but also good workability, compactness and corrosion resistance. In order to meet the requirements of high strength, good workability and excellent corrosion resistance, the industry has been continuously exploring the research and application of new concrete admixtures. These efforts aim to improve the overall performance of concrete, so as to adapt to the complex and changeable working environment, ensure the safe and stable operation of wind power facilities, and further promote the development of the clean energy industry.

[0003] Although the existing concrete admixtures can improve the performance of concrete to a certain extent, they often sacrifice workability and durability while increasing strength, thus affecting the long-term stability of concrete. Therefore, how to effectively coordinate the mutual relationship between various functional components so that the concrete has both high strength and high durability has become a key bottleneck to be broken through urgently. Summary of the Invention

[0004] In order to solve the above technical problems, this application provides a high-performance concrete admixture composition for wind power tower barrels and a preparation method thereof.

[0005] A high-performance concrete admixture composition for wind power tower barrels and a preparation method thereof provided by this application adopt the following technical solutions: A high-performance concrete admixture composition for wind power tower barrels includes the following components in parts by weight: 35-45 parts of shrinkage-reducing polycarboxylate water reducer, 8-12 parts of methoxypolyethylene glycol acrylate modified nano-silica, 1.5-2.5 parts of sodium dodecyl polyoxyethylene ether sulfonate, 0.8-1.5 parts of coconut oil diethanolamide, 0.3-0.8 parts of sodium polyacrylate, 0.2-0.6 parts of ammonium tripolyphosphate, 0.05-0.15 parts of polyether defoamer and 40-50 parts of water.

[0006] By adopting the above technical solutions, through the synergistic effect among various admixtures, this application regulates the hydration process of concrete, optimizes the pore structure inside the concrete and strengthens the interfacial transition zone, thereby realizing the systematic improvement of the microscopic structure of concrete and significantly improving the strength and durability of concrete.

[0007] In a specific embodiment, the high-performance concrete admixture composition for wind power tower barrels comprises 42 parts of a shrinkage-reducing polycarboxylate water reducer, 10 parts of methoxypolyethylene glycol acrylate modified nano-silica, 2 parts of sodium dodecyl polyoxyethylene ether sulfonate, 1 part of coconut oil diethanolamide, 0.6 part of sodium polyacrylate, 0.4 part of ammonium tripolyphosphate, 0.1 part of polyether defoamer, and 43.9 parts of water.

[0008] In a specific comparative example, the high-performance concrete admixture composition for wind power tower barrels comprises 42 parts of BL-7 polycarboxylate water reducer, 10 parts of methoxypolyethylene glycol acrylate modified nano-silica, 2 parts of sodium dodecyl polyoxyethylene ether sulfonate, 1 part of coconut oil diethanolamide, 0.6 part of sodium polyacrylate, 0.4 part of ammonium tripolyphosphate, 0.1 part of polyether defoamer, and 43.9 parts of water.

[0009] In a specific comparative example, the high-performance concrete admixture composition for wind power tower barrels comprises 42 parts of JC-05 polycarboxylate high-performance water reducer, 10 parts of methoxypolyethylene glycol acrylate modified nano-silica, 2 parts of sodium dodecyl polyoxyethylene ether sulfonate, 1 part of coconut oil diethanolamide, 0.6 part of sodium polyacrylate, 0.4 part of ammonium tripolyphosphate, 0.1 part of polyether defoamer, and 43.9 parts of water.

[0010] Among them, when the high-performance concrete admixture composition for wind power tower barrels prepared by using the shrinkage-reducing polycarboxylate water reducer provided in this application is applied to concrete, the water absorption rate is reduced by 2.34 - 2.28% compared with that of using commercially available BL-7 polycarboxylate water reducer and JC-05 polycarboxylate high-performance water reducer, the 28-day compressive strength is increased by 24.7 - 23.9 MPa, the electric flux is reduced by 610 - 570 C, and the freeze-thaw mass loss rate is reduced by 2.17 - 1.78%. This shows that the shrinkage-reducing polycarboxylate water reducer provided in this application has better effects on improving the strength and durability of concrete compared with other commercially available polycarboxylate water reducers.

[0011] In summary, the use of the shrinkage-reducing polycarboxylate water reducer in this application can fully exert its synergistic effect with other components, and has a significant effect on improving the strength and durability of concrete.

[0012] In a specific embodiment, the high-performance concrete admixture composition for wind power tower barrels comprises 35 parts of a shrinkage-reducing polycarboxylate water reducer, 12 parts of methoxypolyethylene glycol acrylate modified nano-silica, 1.5 parts of sodium dodecyl polyoxyethylene ether sulfonate, 1.5 parts of coconut oil diethanolamide, 0.3 part of sodium polyacrylate, 0.6 part of ammonium tripolyphosphate, 0.05 part of polyether defoamer, and 50 parts of water.

[0013] In a specific embodiment, the high-performance concrete admixture composition for wind power tower barrels comprises 38 parts of a shrinkage-reducing polycarboxylate water reducer, 11 parts of methoxypolyethylene glycol acrylate-modified nano-silica, 1.7 parts of sodium dodecyl polyoxyethylene ether sulfonate, 1.2 parts of coconut oil diethanolamide, 0.4 part of sodium polyacrylate, 0.5 part of ammonium tripolyphosphate, 0.08 part of polyether defoamer, and 47 parts of water.

[0014] In a specific embodiment, the high-performance concrete admixture composition for wind power tower barrels comprises 42 parts of a shrinkage-reducing polycarboxylate water reducer, 10 parts of methoxypolyethylene glycol acrylate-modified nano-silica, 2 parts of sodium dodecyl polyoxyethylene ether sulfonate, 1 part of coconut oil diethanolamide, 0.6 part of sodium polyacrylate, 0.4 part of ammonium tripolyphosphate, 0.1 part of polyether defoamer, and 43.9 parts of water.

[0015] In a specific embodiment, the high-performance concrete admixture composition for wind power tower barrels comprises 45 parts of a shrinkage-reducing polycarboxylate water reducer, 8 parts of methoxypolyethylene glycol acrylate-modified nano-silica, 2.5 parts of sodium dodecyl polyoxyethylene ether sulfonate, 0.8 part of coconut oil diethanolamide, 0.8 part of sodium polyacrylate, 0.2 part of ammonium tripolyphosphate, 0.15 part of polyether defoamer, and 40 parts of water.

[0016] Among them, the high-performance concrete admixture composition for wind power tower barrels comprising 42 parts of a shrinkage-reducing polycarboxylate water reducer, 10 parts of methoxypolyethylene glycol acrylate-modified nano-silica, 2 parts of sodium dodecyl polyoxyethylene ether sulfonate, 1 part of coconut oil diethanolamide, 0.6 part of sodium polyacrylate, 0.4 part of ammonium tripolyphosphate, 0.1 part of polyether defoamer, and 43.9 parts of water is the optimal technical solution. Compared with other technical solutions, the water absorption rate in concrete is reduced by 0.09 - 0.15%, the 28-day compressive strength is increased by 2.7 - 3.5 MPa, the electric flux is reduced by 20 - 30 C, and the mass loss rate of freeze-thaw cycles is reduced by 0.07 - 0.11%. This shows that the preferred ratio of the high-performance concrete admixture composition for wind power tower barrels provided in this application can enable each component to give full play to the synergistic effect, thereby further improving the strength and durability of the concrete.

[0017] Preferably, the shrinkage-reducing polycarboxylate water reducer comprises acrylic acid, methallyl polyoxyethylene ether, and diethylene glycol monobutyl ether maleic anhydride monoester with a molar ratio of (3.5 - 4.5):(1 - 1.5):(1.5 - 2.5).

[0018] By adopting the above technical solution, a shrinkage-reducing polycarboxylate water reducer is prepared by polymerizing acrylic acid, methallyl polyoxyethylene ether, and diethylene glycol monobutyl ether maleic anhydride monoester. It has both water-reducing effect and shrinkage-reducing performance. While exerting the advantages of high water reduction rate and high slump retention, it can effectively reduce the shrinkage rate of concrete, thereby improving the strength and durability of the concrete.

[0019] In a specific embodiment, the shrinkage-reducing polycarboxylate water reducer comprises acrylic acid, methallyl polyoxyethylene ether and diethylene glycol monobutyl ether maleic anhydride monoester with a molar ratio of 3.5:1.5:1.5.

[0020] In a specific embodiment, the shrinkage-reducing polycarboxylate water reducer comprises acrylic acid, methallyl polyoxyethylene ether and diethylene glycol monobutyl ether maleic anhydride monoester with a molar ratio of 3.8:1.1:1.8.

[0021] In a specific embodiment, the shrinkage-reducing polycarboxylate water reducer comprises acrylic acid, methallyl polyoxyethylene ether and diethylene glycol monobutyl ether maleic anhydride monoester with a molar ratio of 4:1.3:2.

[0022] In a specific embodiment, the shrinkage-reducing polycarboxylate water reducer comprises acrylic acid, methallyl polyoxyethylene ether and diethylene glycol monobutyl ether maleic anhydride monoester with a molar ratio of 4.5:1:2.5.

[0023] Among them, the shrinkage-reducing polycarboxylate water reducer comprising acrylic acid, methallyl polyoxyethylene ether and diethylene glycol monobutyl ether maleic anhydride monoester with a molar ratio of 4:1.3:2 is the optimal technical solution. Compared with the shrinkage-reducing polycarboxylate water reducer prepared by other technical solutions, the water absorption rate when applied to concrete is reduced by 0.06 - 0.13%, the 28-day compressive strength is increased by 3.4 - 4.7 MPa, the electric flux is reduced by 110 - 120 C, and the mass loss rate of freeze-thaw cycles is reduced by 0.14 - 0.17%. This shows that the preferred ratio of each component in the shrinkage-reducing polycarboxylate water reducer provided by this application has a good effect on further improving the synergistic effect of the shrinkage-reducing effect and water-reducing performance of the shrinkage-reducing polycarboxylate water reducer.

[0024] Preferably, the preparation method of the diethylene glycol monobutyl ether maleic anhydride monoester comprises the following steps: Heat maleic anhydride to 53 - 58 °C until it completely melts, then add diethylene glycol monobutyl ether, stir and mix evenly, and heat to 125 - 135 °C, react for 4 - 5 h, cool and purify to obtain diethylene glycol monobutyl ether maleic anhydride monoester; Among them, the molar ratio of maleic anhydride to diethylene glycol monobutyl ether is (3 - 4):(0.8 - 1.2).

[0025] By adopting the above technical solution, this application synthesizes the monomer diethylene glycol monobutyl ether maleic anhydride monoester with a shrinkage-reducing function through the esterification reaction of maleic anhydride and diethylene glycol monobutyl ether. The shrinkage-reducing function is exerted through diethylene glycol monobutyl ether maleic anhydride monoester, fully synergizing the water-reducing effect and shrinkage-reducing function, thereby improving the strength and durability of concrete.

[0026] Preferably, the preparation method of the shrinkage-reducing polycarboxylate water reducer comprises the following steps: S1. Dissolve methallyl polyoxyethylene ether in water to obtain a reaction solution, dissolve acrylic acid and diethylene glycol monobutyl ether maleic anhydride monoester in water to obtain a monomer solution, and dissolve ammonium persulfate in water to obtain an initiator solution; S2. Heat the reaction solution to 70 - 90°C. In an inert gas atmosphere, simultaneously dropwise add the monomer solution and the initiator solution to the reaction solution. After the dropping is completed, react for 2 - 2.5 h, then cool, and adjust the pH of the solution to 7 - 7.5 to obtain the shrinkage-reducing polycarboxylate water reducer; Wherein, the total monomer concentration of methallyl polyoxyethylene ether, acrylic acid and diethylene glycol monobutyl ether maleic anhydride monoester is 28 - 32%, and ammonium persulfate accounts for 0.8 - 1.2% of the total monomer mass.

[0027] By adopting the above technical solution, the polycarboxylate water reducer is prepared by free radical polymerization and grafted with the shrinkage-reducing monomer diethylene glycol monobutyl ether maleic anhydride monoester, thereby obtaining the shrinkage-reducing polycarboxylate water reducer, which has good dispersibility, fully synergizes the water-reducing effect and shrinkage-reducing performance, and further significantly improves the strength and durability of concrete.

[0028] Preferably, the preparation method of the methoxypolyethylene glycol acrylate modified silica comprises the following steps: A1. Add nano-silica into toluene, ultrasonicate for 13 - 15 min to obtain a suspension. Under an inert gas atmosphere, add the silane coupling agent KH550 into the suspension, and raise the temperature to 100 - 110°C, stir for 18 - 22 h. After cooling to room temperature, perform centrifugation, washing and drying in sequence to obtain product 1; A2. Add product 1 into methanol, ultrasonicate for 13 - 15 min, add methyl acrylate, raise the temperature to 48 - 52°C, stir and react for 11 - 13 h, then add ethylenediamine, continue to stir for 11 - 13 h, and finally perform centrifugation, washing and drying in sequence to obtain product 2; A3. Add product 2 into dimethyl sulfoxide, stir for 13 - 15 min, then raise the temperature to 70 - 80°C, add methoxypolyethylene glycol acrylate and lithium chloride, stir for 22 - 24 h, then perform centrifugation and washing, and finally dry at 55 - 60°C to obtain methoxypolyethylene glycol acrylate modified silica.

[0029] In a specific embodiment, the weight ratio of nano-silica, silane coupling agent KH550, methyl acrylate, ethylenediamine, methoxypolyethylene glycol acrylate and lithium chloride is 3:9:0.7:1.2:6:0.12.

[0030] In a specific embodiment, the weight ratio of nano-silica, silane coupling agent KH550, methyl acrylate, ethylenediamine, methoxypolyethylene glycol acrylate, and lithium chloride is 5:7:0.9:0.9:7:0.1.

[0031] In a specific embodiment, the weight ratio of nano-silica, silane coupling agent KH550, methyl acrylate, ethylenediamine, methoxypolyethylene glycol acrylate, and lithium chloride is 2:10:0.5:1.5:5:0.15.

[0032] In a specific embodiment, the weight ratio of nano-silica, silane coupling agent KH550, methyl acrylate, ethylenediamine, methoxypolyethylene glycol acrylate, and lithium chloride is 7:5:1.5:0.5:9:0.05.

[0033] Among them, when the weight ratio of nano-silica, silane coupling agent KH550, methyl acrylate, ethylenediamine, methoxypolyethylene glycol acrylate, and lithium chloride is in the range of (3 - 5):(7 - 9):(0.7 - 0.9):(0.9 - 1.2):(6 - 7):(0.1 - 0.12), compared with that prepared outside the range, the water absorption rate of the methoxypolyethylene glycol acrylate modified nano-silica applied to concrete is reduced by 0.22 - 0.48%, the 28d compressive strength is increased by 5.8 - 7.8 MPa, the electric flux is reduced by 110 - 130 C, and the freeze-thaw mass loss rate is reduced by 0.14 - 0.19%. This shows that the mixing ratio range of each component in the methoxypolyethylene glycol acrylate modified nano-silica provided by this application has a good effect on improving the performance of the methoxypolyethylene glycol acrylate modified nano-silica.

[0034] Preferably, the preparation method includes the following steps: Weigh the shrinkage-reducing polycarboxylate superplasticizer, methoxypolyethylene glycol acrylate modified nano-silica, sodium dodecyl polyoxyethylene ether sulfonate, coconut oil diethanolamide, sodium polyacrylate, ammonium tripolyphosphate, polyether defoamer, and water by weight, and mix the above components evenly to obtain the high-performance concrete admixture composition for wind power tower barrels.

[0035] In summary, this application has the following beneficial technical effects: 1. By using the shrinkage-reducing polycarboxylate superplasticizer, ammonium tripolyphosphate, sodium polyacrylate, and methoxypolyethylene glycol acrylate modified nano-silica in combination, this application synergistically regulates the hydration process of concrete, slows down the hydration temperature rise, inhibits the generation of cracks, improves the self-healing ability of concrete, and thus improves the strength and durability of concrete; 2. By using ammonium tripolyphosphate and sodium polyacrylate in combination, this application synergistically improves the erosion resistance of concrete and further improves the durability of concrete. Detailed implementation manners

[0036] The specific embodiments are only explanations of the present application and do not limit the present application. After reading this specification, those skilled in the art can make modifications to these embodiments without creative contributions as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

[0037] Material source Acrylic acid, industrial grade (≥99.5%), purchased from Wanhua Chemical Group Co., Ltd.; Methallyl polyoxyethylene ether, TPEG-2400, purchased from Jiangsu Zhongshan Chemical Co., Ltd.; Diethylene glycol monobutyl ether, industrial grade (≥99%), purchased from Jiangsu Yida Chemical Co., Ltd.; Maleic anhydride, industrial grade (≥99.5%), purchased from Shandong Hongxin Chemical Industry Co., Ltd.; Ammonium persulfate, analytical pure (≥98%), purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; Methoxypolyethylene glycol acrylate, MPEGMA-1000, purchased from Wanhua Chemical Group Co., Ltd.; Nano-silica, specific surface area 200m 2 / g, purchased from Evonik Industries China Investment Co., Ltd.; Toluene, industrial grade (≥99%), purchased from China Petroleum & Chemical Corporation; Silane coupling agent KH550, purchased from Hubei New Blue Sky New Materials Co., Ltd.; Methanol, industrial grade (≥99.9%), purchased from Shanxi Coking Co., Ltd.; Methyl acrylate, industrial grade (≥99%), purchased from Jiangsu Jurong Chemical Co., Ltd.; Ethylenediamine, analytical pure (≥99%), purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; Dimethyl sulfoxide, pharmaceutical grade (≥99%), purchased from Jiangsu Qiangsheng Functional Chemical Co., Ltd.; Lithium chloride, purchased from Jiangxi Ganfeng Lithium Co., Ltd.; Sodium dodecyl polyoxyethylene ether sulfate, industrial grade, purchased from BASF (China) Co., Ltd.; Coconut oil diethanolamide, type 6501 (≥95%), purchased from Nanjing Huatuo Chemical Co., Ltd.; Ammonium polyacrylate, industrial grade (molecular weight 8 million), purchased from Shandong Baomo Biochemical Co., Ltd.; Ammonium tripolyphosphate, industrial grade (≥95%), purchased from Hubei Xingfa Chemicals Group Co., Ltd.; The model of the polyether defoamer is TEGO XP22063, purchased from Beijing Kaimite Technology Development Co., Ltd.; The BL-7 polycarboxylate water reducer is purchased from Zibo Bolei Building Materials Co., Ltd.; The JC-05 polycarboxylate superplasticizer is purchased from Shandong Jiangtai New Engineering Materials Group; The cement model is P.O52.5, ordinary Portland cement, purchased from Anhui Conch Cement Co., Ltd.; Fly ash, model I, 45μm sieve residue ≤ 12%, purchased from Jining Hengzhi New Building Materials Co., Ltd.; Ground granulated blast-furnace slag, model S95, 7-day activity index ≥ 75%, purchased from Jining Hengzhi New Building Materials Co., Ltd.; Sand, river sand, fineness modulus 2.9, mud content ≤ 1.0%, purchased from LingShou County ShengBang Mineral Products Co., Ltd.; Gravel, 5-25mm continuous grading, purchased from Shijiazhuang Yuanjing Mineral Products Co., Ltd.; Preparation Example 1-1 The preparation method of diethylene glycol monobutyl ether maleic anhydride monoester includes the following steps: Add 6 mol of maleic anhydride into a three-necked flask equipped with a thermometer, a stirrer and a reflux condenser, and heat it to 53°C. After it is completely melted, add 2.4 mol of diethylene glycol monobutyl ether, stir and mix evenly, and heat it to 135°C, react for 4 h, cool and purify by vacuum filtration to obtain diethylene glycol monobutyl ether maleic anhydride monoester.

[0038] Preparation Example 1-2 The preparation method of diethylene glycol monobutyl ether maleic anhydride monoester includes the following steps: Add 8 mol of maleic anhydride into a three-necked flask equipped with a thermometer, a stirrer and a reflux condenser, and heat it to 58°C. After it is completely melted, add 1.6 mol of diethylene glycol monobutyl ether, stir and mix evenly, and heat it to 125°C, react for 5 h, cool and purify by vacuum filtration to obtain diethylene glycol monobutyl ether maleic anhydride monoester.

[0039] Preparation Example 2-1 The preparation method of the shrinkage-reducing polycarboxylate water reducer includes the following steps: S1. Dissolve 7200 g of methyl allyl polyoxyethylene ether in water to obtain a reaction solution, dissolve 508.2 g of acrylic acid and 780 g of diethylene glycol monobutyl ether maleic anhydride monoester in water to obtain a monomer solution, and dissolve 101.9 g of ammonium persulfate in water to obtain an initiator solution; S2. Heat the reaction solution to 70 °C. In a nitrogen atmosphere, simultaneously add dropwise the monomer solution and the initiator solution to the reaction solution. After the addition is complete, react for 2.5 h, then cool, and adjust the pH of the solution to 7 to obtain a shrinkage-reducing polycarboxylate water reducer; Among them, the molar ratio of methallyl polyoxyethylene ether, acrylic acid, and diethylene glycol monobutyl ether maleic anhydride monoester is 4.5:1:2.5. The total monomer concentration of methallyl polyoxyethylene ether, acrylic acid, and diethylene glycol monobutyl ether maleic anhydride monoester is 28%. Ammonium persulfate accounts for 1.2% of the total monomer mass. The total amount of water used in step S1 is 21826.8 ml. The diethylene glycol monobutyl ether maleic anhydride monoester used in step S1 is the diethylene glycol monobutyl ether maleic anhydride monoester prepared in Preparation Example 1-1.

[0040] Preparation Example 2-2 The preparation method of the shrinkage-reducing polycarboxylate water reducer includes the following steps: S1. Dissolve 4800 g of methallyl polyoxyethylene ether in water to obtain a reaction solution. Dissolve 653.4 g of acrylic acid and 1300 g of diethylene glycol monobutyl ether maleic anhydride monoester in water to obtain a monomer solution. Dissolve 54.03 g of ammonium persulfate in water to obtain an initiator solution; S2. Heat the reaction solution to 90 °C. In a nitrogen atmosphere, simultaneously add dropwise the monomer solution and the initiator solution to the reaction solution. After the addition is complete, react for 2 h, then cool, and adjust the pH of the solution to 7.5 to obtain a shrinkage-reducing polycarboxylate water reducer; Among them, the molar ratio of methallyl polyoxyethylene ether, acrylic acid, and diethylene glycol monobutyl ether maleic anhydride monoester is 3.5:1.5:1.5. The total monomer concentration of methallyl polyoxyethylene ether, acrylic acid, and diethylene glycol monobutyl ether maleic anhydride monoester is 32%. Ammonium persulfate accounts for 0.8% of the total monomer mass. The total amount of water used in step S1 is 14351 ml. The diethylene glycol monobutyl ether maleic anhydride monoester used in step S1 is the diethylene glycol monobutyl ether maleic anhydride monoester prepared in Preparation Example 1-2.

[0041] Preparation Example 2-3 The difference from Preparation Example 2-1 is that in step S1, the methallyl polyoxyethylene ether is 6240 g, the acrylic acid is 580.8 g, the diethylene glycol monobutyl ether maleic anhydride monoester is 1040 g, the ammonium persulfate is 94.33 g, the total amount of water used is 20213.5 ml, and the molar ratio of methallyl polyoxyethylene ether, acrylic acid, and diethylene glycol monobutyl ether maleic anhydride monoester is 4:1.3:2.

[0042] Preparation Example 2-4 The difference from Preparation Example 2-1 is as follows: In step S1, 9600 g of methyl allyl polyoxyethylene ether, 435.6 g of acrylic acid, 520 g of diethylene glycol monobutyl ether maleic anhydride monoester, 126.7 g of ammonium persulfate are used, and the total amount of water used is 27143 ml. The molar ratio of methyl allyl polyoxyethylene ether, acrylic acid and diethylene glycol monobutyl ether maleic anhydride monoester is 3:2:1.

[0043] Preparation Example 2-5 The difference from Preparation Example 2-1 is as follows: In step S1, 2400 g of methyl allyl polyoxyethylene ether, 726 g of acrylic acid, 1560 g of diethylene glycol monobutyl ether maleic anhydride monoester, 56.23 g of ammonium persulfate are used, and the total amount of water used is 12050 ml. The molar ratio of methyl allyl polyoxyethylene ether, acrylic acid and diethylene glycol monobutyl ether maleic anhydride monoester is 5:0.5:3.

[0044] Preparation Example 3-1 The preparation method of methoxypolyethylene glycol acrylate modified silica includes the following steps: A1. Add 600 g of nano-silica into toluene, ultrasonicate for 15 min to obtain a suspension. Under a nitrogen atmosphere, add 1800 g of silane coupling agent KH550 into the suspension, raise the temperature to 100 °C, stir for 22 h, cool to room temperature, and then perform centrifugation, washing and drying in sequence to obtain Product 1; A2. Add Product 1 into methanol, ultrasonicate for 13 min, add 140 g of methyl acrylate, raise the temperature to 52 °C, stir and react for 11 h, then add 240 g of ethylenediamine, continue to stir for 13 h, and finally perform centrifugation, washing and drying in sequence to obtain Product 2; A3. Add Product 2 into dimethyl sulfoxide, stir for 15 min, then raise the temperature to 70 °C, add 1200 g of methoxypolyethylene glycol acrylate and 24 g of lithium chloride, stir for 24 h, then perform centrifugation and washing, and finally dry at 55 °C to obtain methoxypolyethylene glycol acrylate modified silica.

[0045] Preparation Example 3-2 The preparation method of methoxypolyethylene glycol acrylate modified silica includes the following steps: A1. Add 1000 g of nano-silica into toluene, ultrasonicate for 13 min to obtain a suspension. Under a nitrogen atmosphere, add 1400 g of silane coupling agent KH550 into the suspension, raise the temperature to 110 °C, stir for 18 h, cool to room temperature, and then perform centrifugation, washing and drying in sequence to obtain Product 1; A2. Add Product 1 into methanol, ultrasonicate for 15 min, add 180 g of methyl acrylate, heat up to 48 °C, stir and react for 13 h, then add 180 g of ethylenediamine, continue stirring for 11 h, and finally perform centrifugation, washing, and drying in sequence to obtain Product 2; A3. Add Product 2 into dimethyl sulfoxide, stir for 13 min, then heat up to 80 °C, add 1400 g of methoxypolyethylene glycol acrylate and 20 g of lithium chloride, stir for 22 h, then perform centrifugation and washing, and finally dry at 60 °C to obtain methoxypolyethylene glycol acrylate modified silica.

[0046] Preparation Example 3-3 The difference from Preparation Example 3-1 is that: the nano-silica is 400 g, the silane coupling agent KH550 is 2000 g, the methyl acrylate is 100 g, the ethylenediamine is 300 g, the methoxypolyethylene glycol acrylate is 1000 g, and the lithium chloride is 30 g.

[0047] Preparation Example 3-4 The difference from Preparation Example 3-1 is that: the nano-silica is 1400 g, the silane coupling agent KH550 is 1000 g, the methyl acrylate is 300 g, the ethylenediamine is 100 g, the methoxypolyethylene glycol acrylate is 1800 g, and the lithium chloride is 10 g.

[0048] Example 1 Mix 3500 g of shrinkage-reducing polycarboxylate superplasticizer, 1200 g of methoxypolyethylene glycol acrylate modified nano-silica, 150 g of dodecyl polyoxyethylene ether sulfonate, 150 g of coconut oil diethanolamide, 30 g of sodium polyacrylate, 60 g of ammonium tripolyphosphate, 5 g of polyether defoamer, and 5000 g of water evenly by stirring to prepare a high-performance concrete admixture composition for wind power tower barrels.

[0049] Among them, the used shrinkage-reducing polycarboxylate superplasticizer is the shrinkage-reducing polycarboxylate superplasticizer prepared in Preparation Example 2-1, and the methoxypolyethylene glycol acrylate modified nano-silica is the methoxypolyethylene glycol acrylate modified nano-silica prepared in Preparation Example 3-1.

[0050] Example 2 Mix 4500 g of shrinkage-reducing polycarboxylate superplasticizer, 800 g of methoxypolyethylene glycol acrylate modified nano-silica, 250 g of dodecyl polyoxyethylene ether sulfonate, 80 g of coconut oil diethanolamide, 80 g of sodium polyacrylate, 20 g of ammonium tripolyphosphate, 15 g of polyether defoamer, and 4000 g of water evenly by stirring to prepare a high-performance concrete admixture composition for wind power tower barrels.

[0051] Among them, the shrinkage-reducing polycarboxylate superplasticizer used is the shrinkage-reducing polycarboxylate superplasticizer prepared in Preparation Example 2-1, and the methoxypolyethylene glycol acrylate-modified nano-silica is the methoxypolyethylene glycol acrylate-modified nano-silica prepared in Preparation Example 3-1.

[0052] Example 3 Mix 4200 g of shrinkage-reducing polycarboxylate superplasticizer, 1000 g of methoxypolyethylene glycol acrylate-modified nano-silica, 200 g of dodecyl polyoxyethylene ether sulfonate, 100 g of coconut oil diethanolamide, 60 g of sodium polyacrylate, 40 g of ammonium tripolyphosphate, 10 g of polyether defoamer and 4390 g of water evenly by stirring to obtain a high-performance concrete admixture composition for wind power tower barrels.

[0053] Among them, the shrinkage-reducing polycarboxylate superplasticizer used is the shrinkage-reducing polycarboxylate superplasticizer prepared in Preparation Example 2-1, and the methoxypolyethylene glycol acrylate-modified nano-silica is the methoxypolyethylene glycol acrylate-modified nano-silica prepared in Preparation Example 3-1.

[0054] Example 4 The difference from Example 3 is that the shrinkage-reducing polycarboxylate superplasticizer used is the shrinkage-reducing polycarboxylate superplasticizer prepared in Preparation Example 2-2.

[0055] Example 5 The difference from Example 3 is that the shrinkage-reducing polycarboxylate superplasticizer used is the shrinkage-reducing polycarboxylate superplasticizer prepared in Preparation Example 2-3.

[0056] Example 6 The difference from Example 3 is that the shrinkage-reducing polycarboxylate superplasticizer used is the shrinkage-reducing polycarboxylate superplasticizer prepared in Preparation Example 2-4.

[0057] Example 7 The difference from Example 3 is that the shrinkage-reducing polycarboxylate superplasticizer used is the shrinkage-reducing polycarboxylate superplasticizer prepared in Preparation Example 2-5.

[0058] Example 8 The difference from Example 3 is that the methoxypolyethylene glycol acrylate-modified nano-silica used is the methoxypolyethylene glycol acrylate-modified nano-silica prepared in Preparation Example 3-2.

[0059] Example 9 The difference from Example 3 is that the methoxypolyethylene glycol acrylate-modified nano-silica used is the methoxypolyethylene glycol acrylate-modified nano-silica prepared in Preparation Example 3-3.

[0060] Example 10 The difference from Example 3 is that the methoxypolyethylene glycol acrylate modified nano-silica used is the methoxypolyethylene glycol acrylate modified nano-silica prepared in Preparation Example 3-4.

[0061] Comparative Example 1 The difference from Example 3 is that the shrinkage-reducing polycarboxylate superplasticizer used is replaced with a commercially available BL-7 polycarboxylate superplasticizer.

[0062] Comparative Example 2 The difference from Example 3 is that the shrinkage-reducing polycarboxylate superplasticizer used is replaced with a commercially available JC-05 polycarboxylate high-performance superplasticizer.

[0063] Application Example 1 Weigh 320 kg of cement, 80 kg of fly ash, 60 kg of slag, 700 kg of sand and 1080 kg of gravel and premix them. Then add 128 kg of water and 9.2 kg of the high-performance concrete admixture composition for wind power tower barrels, and stir and mix evenly to obtain concrete. Among them, the high-performance concrete admixture composition for wind power tower barrels used is the high-performance concrete admixture composition for wind power tower barrels prepared in Example 1.

[0064] Application Examples 2-10 The difference from Application Example 1 is that the high-performance concrete admixture compositions for wind power tower barrels used are the high-performance concrete admixture compositions for wind power tower barrels prepared in Examples 2-10 respectively.

[0065] Comparative Application Examples 1-2 The difference from Application Example 1 is that the high-performance concrete admixture compositions for wind power tower barrels used are the high-performance concrete admixture compositions for wind power tower barrels prepared in Comparative Examples 1-2 respectively.

[0066] Performance Detection Respectively make the concrete prepared in the above Application Examples 1-10 and Comparative Application Examples 1-2 into concrete test blocks, and conduct water absorption rate detection, compressive strength detection, chloride ion resistance detection and freeze-thaw cycle detection.

[0067] 1. Water absorption rate detection: Take a 100 mm×100 mm×100 mm concrete test block, weigh it after drying at 105 °C for 72 h, record it as m1, then completely immerse the test block in water until the mass is constant, take it out, wipe off the surface moisture, and weigh it again, record it as m2. The water absorption rate calculation formula is: water absorption rate = (m2 - m1) / m1 * 100%.

[0068] 2. Compressive strength test: Use a pressure testing machine to conduct a compressive strength test on concrete specimens with dimensions of 150 mm × 150 mm × 150 mm, and operate in accordance with GB / T 50081-2016 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete".

[0069] 3. Chloride ion resistance test: Use a concrete chloride ion electric flux meter to conduct an electric flux test on concrete specimens with a diameter of 100 mm and a height of 100 mm, and operate in accordance with GB / T 50082-2009 "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete".

[0070] 4. Freeze-thaw cycle test: Conduct a freeze-thaw cycle test in accordance with GB / T 50082-2009 "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete". Place concrete specimens with dimensions of 100 mm × 100 mm × 400 mm in a cycle of -18°C to 4°C, with the number of cycles being 200 times. After the cycle ends, measure the mass loss rate. The mass loss rate = (initial mass - mass after cycle) / initial mass * 100%.

[0071] The performance test results are shown in Table 1.

[0072] Table 1 Concrete performance test results As can be seen from Table 1, the water absorption rates of the concrete prepared in Application Example 1 and Application Example 2 of this application are 0.87% and 0.93% respectively, the 28-day compressive strengths are 82.5 MPa and 81.7 MPa respectively, the electric fluxes are 730 C and 740 C respectively, and the freeze-thaw mass loss rates are 0.63% and 0.67% respectively. Compared with Comparative Application Example 1, the water absorption rates are reduced by 2.25% and 2.19% respectively, the 28-day compressive strengths are increased by 22 MPa and 21.2 MPa respectively, the electric fluxes are reduced by 590 C and 580 C respectively, and the freeze-thaw mass loss rates are reduced by 2.1% and 2.06% respectively. Compared with Comparative Application Example 2, the water absorption rates are reduced by 2.19% and 2.13% respectively, the 28-day compressive strengths are increased by 21.2 MPa and 20.4 MPa respectively, the electric fluxes are reduced by 550 C and 540 C respectively, and the freeze-thaw mass loss rates are reduced by 1.71% and 1.67% respectively. This shows that the high-performance concrete admixture compositions for wind power tower barrels provided in Example 1 and Example 2 of this application have significant effects on improving the strength and durability of concrete.

[0073] In Application Example 3 of this application, the water absorption rates of the prepared concrete compared to those in Application Examples 1 and 2 decreased by 0.09% and 0.15% respectively, the 28-day compressive strengths increased by 2.7 MPa and 3.5 MPa respectively, the electric fluxes decreased by 20 C and 30 C respectively, and the freeze-thaw mass loss rates decreased by 0.07% and 0.11% respectively. This shows that the preferred ratio of the high-performance concrete admixture composition for wind power tower barrels provided in Example 3 of this application can enable each component to more fully exert a synergistic effect, thereby further improving the strength and durability of the concrete.

[0074] All the data in Application Example 4 of this application are close to those in Application Example 3 of this application, indicating that the ratio range of the shrinkage-reducing polycarboxylate water reducer provided in this application has a good effect on improving the strength and durability of the concrete.

[0075] In Application Example 5 of this application, the water absorption rate of the prepared concrete compared to that in Application Example 3 decreased by 0.06%, the 28-day compressive strength increased by 3.4 MPa, the electric flux decreased by 110 C, and the freeze-thaw mass loss rate decreased by 0.14%. This shows that the preferred ratio of each component in the shrinkage-reducing polycarboxylate water reducer provided in this application has a good effect on further improving the synergistic effect of the shrinkage-reducing effect and water-reducing performance of the shrinkage-reducing polycarboxylate water reducer.

[0076] In Application Examples 6 and 7 of this application, the water absorption rates of the prepared concrete compared to that in Application Example 3 increased by 0.85% and 1.07% respectively, the 28-day compressive strengths decreased by 12 MPa and 13.7 MPa respectively, the electric fluxes increased by 210 C and 240 C respectively, and the freeze-thaw mass loss rates increased by 0.39% and 0.57% respectively. This shows that the ratio range of each component in the shrinkage-reducing polycarboxylate water reducer provided in this application has a good effect on improving the synergistic effect of the shrinkage-reducing effect and water-reducing performance of the shrinkage-reducing polycarboxylate water reducer.

[0077] All the data in Application Example 8 of this application are close to those in Application Example 3 of this application, indicating that the ratio range of the methoxypolyethylene glycol acrylate-modified nano-silica provided in this application has a good effect on improving the strength and durability of the concrete.

[0078] In Application Examples 9 and 10 of this application, the water absorption rates of the prepared concrete compared to that in Application Example 3 increased by 0.25% and 0.48% respectively, the 28-day compressive strengths decreased by 6.9 MPa and 7.8 MPa respectively, the electric fluxes increased by 130 C and 110 C respectively, and the freeze-thaw mass loss rates increased by 0.19% and 0.15% respectively. This shows that the ratio range of each component in the methoxypolyethylene glycol acrylate-modified nano-silica provided in this application has a good effect on improving the performance of the methoxypolyethylene glycol acrylate-modified nano-silica.

[0079] The water absorption rates of the concrete prepared in Comparative Application Example 1 and Comparative Application Example 2 of this application compared to Application Example 3 increased by 2.34% and 2.28% respectively, the 28-day compressive strengths decreased by 24.7 MPa and 23.9 MPa respectively, the electric flux increased by 610 C and 570 C respectively, and the freeze-thaw mass loss rates increased by 2.17% and 1.78% respectively. This shows that the shrinkage-reducing polycarboxylate water reducer provided by this application has better effects on improving the strength and durability of concrete compared to other commercially available polycarboxylate water reducers.

Claims

1. A high-performance concrete admixture composition for wind power tower barrels, characterized in that, It comprises components in the following parts by weight: 35 - 45 parts of shrinkage-reducing polycarboxylate superplasticizer, 8 - 12 parts of methoxypolyethylene glycol acrylate modified nano-silica, 1.5 - 2.5 parts of sodium dodecyl polyoxyethylene ether sulfonate, 0.8 - 1.5 parts of coconut oil diethanolamide, 0.3 - 0.8 parts of sodium polyacrylate, 0.2 - 0.6 parts of ammonium tripolyphosphate, 0.05 - 0.15 parts of polyether defoamer, and 40 - 50 parts of water.

2. The high-performance concrete admixture composition for a wind power tower barrel according to claim 1, characterized in that, It comprises components in the following parts by weight: 42 parts of shrinkage-reducing polycarboxylate superplasticizer, 10 parts of methoxypolyethylene glycol acrylate modified nano-silica, 2 parts of sodium dodecyl polyoxyethylene ether sulfonate, 1 part of coconut oil diethanolamide, 0.6 parts of sodium polyacrylate, 0.4 parts of ammonium tripolyphosphate, 0.1 parts of polyether defoamer, and 43.9 parts of water.

3. The high-performance concrete admixture composition for a wind power tower barrel according to claim 1, wherein: The shrinkage-reducing polycarboxylate superplasticizer comprises acrylic acid, methallyl polyoxyethylene ether and diethylene glycol monobutyl ether maleic anhydride monoester in a molar ratio of (3.5 - 4.5):(1 - 1.5):(1.5 - 2.5).

4. A high-performance concrete admixture composition for a wind power tower barrel according to claim 3, characterized in that: The shrinkage-reducing polycarboxylate superplasticizer comprises acrylic acid, methallyl polyoxyethylene ether and diethylene glycol monobutyl ether maleic anhydride monoester in a molar ratio of 4:1.3:

2.

5. The high-performance concrete admixture composition for a wind power tower barrel according to claim 3, wherein The preparation method of the diethylene glycol monobutyl ether maleic anhydride monoester comprises the following steps: Heat maleic anhydride to 53 - 58 °C until it completely melts, then add diethylene glycol monobutyl ether, stir and mix evenly, and heat to 125 - 135 °C, react for 4 - 5 h, cool and purify to obtain diethylene glycol monobutyl ether maleic anhydride monoester; Among them, the molar ratio of maleic anhydride to diethylene glycol monobutyl ether is (3 - 4):(0.8 - 1.2).

6. The high-performance concrete admixture composition for a wind power tower barrel according to claim 5, characterized in that, The preparation method of the shrinkage-reducing polycarboxylate superplasticizer comprises the following steps: S1. Dissolve methallyl polyoxyethylene ether in water to obtain a reaction solution, dissolve acrylic acid and diethylene glycol monobutyl ether maleic anhydride monoester in water to obtain a monomer solution, and dissolve ammonium persulfate in water to obtain an initiator solution; S2. Heat the reaction solution to 70 - 90 °C, in an inert gas atmosphere, simultaneously dropwise add the monomer solution and the initiator solution to the reaction solution, after the dropping is completed, react for 2 - 2.5 h, then cool, and adjust the pH of the solution to 7 - 7.5 to obtain the shrinkage-reducing polycarboxylate superplasticizer; Among them, the total monomer concentration of methallyl polyoxyethylene ether, acrylic acid and diethylene glycol monobutyl ether maleic anhydride monoester is 28 - 32%, and ammonium persulfate accounts for 0.8 - 1.2% of the total monomer mass.

7. A high-performance concrete admixture composition for a wind power tower barrel according to claim 1, characterized in that, The preparation method of the methoxypolyethylene glycol acrylate modified silica comprises the following steps: A1. Add nano-silica to toluene, ultrasonicate for 13 - 15 min to obtain a suspension, in an inert gas atmosphere, add silane coupling agent KH550 to the suspension, and heat to 100 - 110 °C, stir for 18 - 22 h, after cooling to room temperature, successively carry out centrifugation, washing and drying to obtain product 1; A2. Add product 1 into methanol, ultrasonicate for 13 - 15 min, add methyl acrylate, heat up to 48 - 52 °C, stir and react for 11 - 13 h, then add ethylenediamine, continue stirring for 11 - 13 h, and finally carry out centrifugation, washing and drying in sequence to obtain product 2; A3. Add product 2 into dimethyl sulfoxide, stir for 13 - 15 min, then heat up to 70 - 80 °C, add methoxypolyethylene glycol acrylate and lithium chloride, stir for 22 - 24 h, carry out centrifugation and washing, and finally dry at 55 - 60 °C to obtain methoxypolyethylene glycol acrylate modified silica; Among them, the weight ratio of nano - silica, silane coupling agent KH550, methyl acrylate, ethylenediamine, methoxypolyethylene glycol acrylate and lithium chloride is (3 - 5):(7 - 9):(0.7 - 0.9):(0.9 - 1.2):(6 - 7):(0.1 - 0.12).

8. The preparation method of a high-performance concrete admixture composition for a wind power tower barrel according to any one of claims 1-7, characterized in that, The preparation method comprises the following steps: Weigh the shrinkage - reducing polycarboxylate superplasticizer, methoxypolyethylene glycol acrylate modified nano - silica, sodium dodecyl polyoxyethylene ether sulfonate, coconut oil diethanolamide, sodium polyacrylate, ammonium tripolyphosphate, polyether defoamer and water by weight parts, and mix and stir the above components evenly to obtain the high - performance concrete admixture composition for wind power tower barrels.

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