A high durability chloride salt attack resistant concrete admixture composition and method of making same
Patent Information
- Application Number
- CN202610807797.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-05
- Publication Date
- 2026-08-28
AI Technical Summary
[0006]为了克服上述背景技术中混凝土在氯盐环境下抗侵蚀能力不足、孔结构调控有限以及界面致密性较差的问题，本发明的目的在于提供一种高耐久抗氯盐侵蚀混凝土外加剂组合物及其制备方法
本发明通过构建由聚乙二醇链段与α-环糊精形成的聚轮烷滑环拓扑结构，使分子链段发生可控滑移与重排，在混凝土硬化过程中形成具有动态调节能力的微观结构，提高孔隙结构的复杂度与曲折度，延长氯离子的扩散路径；利用2,5-二羟基对苯二甲醛与三聚氰胺形成动态共价交联网络，使体系具备可逆重构能力，对微观结构缺陷进行修复并抑制微裂纹扩展，提高长期耐久稳定性；引入八(3-氨丙基)倍半硅氧烷作为无机笼状节点，在体系中形成空间限域效应，增强网络骨架稳定性并降低连通孔比例，提高混凝土致密程度；2,6-二羟基三蝶烯通过刚性共轭结构与多羟基作用对孔道结构产生路径扭曲效应，提高氯离子迁移阻力；植酸与硝酸锆形成稳定配位结构，对氯离子进行络合与固定，实现物理阻隔与化学固定协同作用，从而显著提高混凝土在高氯盐环境中的抗侵蚀性能及长期服役耐久性。
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Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of building materials and functional concrete admixtures, specifically relating to a high-durability chloride-resistant concrete admixture composition and its preparation method. Background Technology
[0002] In marine engineering, cross-sea bridges, port structures, and winter de-icing salt environments, concrete is subjected to long-term high-concentration chloride corrosion. Chloride ions can continuously migrate through the internal pore structure of the concrete and reach the surface of the reinforcing steel, damaging the passivation film on the steel and causing steel corrosion. This leads to concrete cracking, spalling, and even structural failure, seriously affecting the safety and service life of engineering structures. Therefore, improving the chloride corrosion resistance of concrete has become one of the important directions in current research on durable concrete.
[0003] In existing technologies, the pore structure of concrete is typically improved or the water-cement ratio is reduced by adding water-reducing agents, air-entraining agents, mineral admixtures, or corrosion-resistant components to delay chloride ion penetration. However, these methods often focus on a single mechanism, such as simple pore structure optimization or ion blocking, which is insufficient to achieve long-term stable resistance to chloride ion attack in complex service environments. Furthermore, traditional admixture systems lack sufficient control over the interfacial transition zone, making it difficult to effectively improve the interfacial structure between aggregates and cement paste, leaving this area as a weak point where chloride ions preferentially penetrate.
[0004] Meanwhile, with the increasing complexity of service environments, higher demands are being placed on concrete materials, and relying solely on single-function admixtures is no longer sufficient to meet the requirements for high durability. In recent years, organic-inorganic composite regulation, dynamic structural adjustment, and multi-scale structural design have gradually become research hotspots. However, most existing systems lack effective structural synergy mechanisms, making it difficult to simultaneously achieve multiple functions such as pore densification, interface strengthening, and chloride ion transport pathway regulation.
[0005] Therefore, there is an urgent need to develop a concrete admixture system that can achieve synergistic regulation at the molecular and microstructural levels. By constructing an organic-inorganic synergistic structure with topological characteristics, it can effectively inhibit chloride ion migration, enhance interfacial stability, and improve the overall durability of the material, thereby solving the problem of insufficient resistance to chloride salt corrosion in existing technologies. Summary of the Invention
[0006] To overcome the problems of insufficient resistance to chloride erosion, limited pore structure control, and poor interface density in concrete under the aforementioned background technologies, the present invention aims to provide a high-durability chloride-resistant concrete admixture composition and its preparation method. This invention introduces components such as methoxy polyethylene glycol monomethacrylate, 2,6-dihydroxytriptene, nano-silica, and silica sol, and combines them with synergistically modified organic-inorganic topological network structures to construct a composite admixture system with multi-scale structural control capabilities. This system forms a dense network structure with synergistic organic-inorganic interaction within the concrete, while simultaneously utilizing the synergistic effect of phytic acid and zirconium nitrate to achieve chemical fixation and transport inhibition of chloride ions. The admixture composition of this invention can significantly improve the pore structure density of concrete and effectively inhibit chloride ion migration, thereby enhancing its durability in chloride environments.
[0007] The objective of this invention can be achieved through the following technical solutions: A high-durability, chloride-resistant concrete admixture composition, comprising the following raw materials in parts by weight: 80-120 parts of methoxy polyethylene glycol monomethacrylate; 5-30 parts of a synergistically modified organic-inorganic topological network structure; 1-10 parts of 2,6-dihydroxytriptene; 5-25 parts of nano-silica; 10-40 parts of silica sol; 2-15 parts of phytic acid; 0.5-5 parts of zirconium nitrate; 0.5-8 parts of triethanolamine; and 50-150 parts of deionized water. The synergistically modified organic-inorganic topological network structure is a three-dimensional synergistic topological structure formed by using polyethylene glycol segments and α-cyclodextrin to construct a polyrotaxane slip ring structure as the topological framework, dynamically covalently crosslinked with 2,5-dihydroxyterephthalaldehyde and melamine, and spatially confined modified using octa(3-aminopropyl)silsesquioxane as inorganic cage nodes.
[0008] Optionally, the synergistically modified organic-inorganic topological network structure comprises the following raw materials in parts by weight: 20-60 parts of polyethylene glycol; 10-40 parts of α-cyclodextrin; 5-25 parts of 2,5-dihydroxyterephthalaldehyde; 2-15 parts of octa(3-aminopropyl)silsesquioxane; 1-10 parts of melamine; and 20-80 parts of ethanol.
[0009] Optionally, the preparation method of synergistically modified organic-inorganic topological network structures includes the following steps: (1) Polyethylene glycol is mixed with α-cyclodextrin, so that α-cyclodextrin is attached to the polyethylene glycol molecular chain to construct a polyrotaxane topology and generate a polyrotaxane intermediate; (2) Add 2,5-dihydroxyterephthalaldehyde and melamine to the polyrotaxane intermediate to cause a condensation reaction to form a dynamic covalent cross-linking network, thereby generating an organic topological cross-linking intermediate; (3) Add octa(3-aminopropyl)silsesquioxane to the organic topological crosslinking intermediate for composite embedding, so that it forms an inorganic cage-like confined structure in the network, and generates a synergistically modified organic-inorganic topological network structure.
[0010] Optionally, the reaction conditions in step (1) are a temperature of 40-80℃, a reaction time of 2-8h, a stirring speed of 200-500r / min, and a water / ethanol mixed solvent.
[0011] Optionally, the reaction conditions in step (2) are a temperature of 50-90℃, a reaction time of 3-10h, a pH of 6-9, and a stirring speed of 300-600r / min.
[0012] Optionally, the reaction conditions in step (3) are a temperature of 60-100℃, a reaction time of 2-6h, a stirring speed of 300-700r / min, and are carried out under an inert atmosphere.
[0013] Optionally, a method for preparing a high-durability, chloride-resistant concrete admixture composition includes the following steps: S1, add methoxy polyethylene glycol monomethacrylate, 2,6-dihydroxytriphenylene and triethanolamine to deionized water and mix and disperse them, stirring evenly to generate an organic functional precursor solution; S2, add nano-silica and silica sol to the organic functional precursor solution for composite dispersion treatment to form a uniform inorganic dispersion system and generate an organic-inorganic composite dispersion. S3 involves adding synergistically modified organic-inorganic topological network structures, phytic acid, and zirconium nitrate to an organic-inorganic composite dispersion for compound mixing, allowing each component to fully interact and form a stable system, thereby generating a high-durability, chloride-resistant concrete admixture composition.
[0014] Optionally, the reaction conditions in step S1 are a temperature of 20–50°C, a reaction time of 1–4 h, and a stirring speed of 200–600 r / min.
[0015] Optionally, the reaction conditions in step S2 are a temperature of 25–60°C, a reaction time of 1–5 h, a stirring speed of 300–800 r / min, and ultrasonic dispersion treatment.
[0016] Optionally, the reaction conditions in step S3 are: temperature of 30–70°C, reaction time of 2–6 h, stirring speed of 300–700 r / min, and pH of the system of 6–8.
[0017] The beneficial effects of this invention are: This invention constructs a polyrotaxane slip ring topology formed by polyethylene glycol segments and α-cyclodextrin, enabling controllable slip and rearrangement of molecular segments. This results in a dynamically adjustable microstructure during concrete hardening, increasing the complexity and tortuosity of the pore structure and extending the chloride ion diffusion path. Furthermore, the invention utilizes a dynamic covalent cross-linked network formed by 2,5-dihydroxyterephthalaldehyde and melamine, giving the system reversible reconstruction capabilities to repair microstructural defects and inhibit microcrack propagation, thus improving long-term durability and stability. The invention also introduces octa(3-aminopropyl) 2,6-dihydroxytriptene, acting as an inorganic cage-like node, creates a spatial confinement effect in the system, enhancing the stability of the network skeleton and reducing the proportion of interconnected pores, thereby increasing the density of concrete. 2,6-dihydroxytriptene, through its rigid conjugated structure and interaction with multiple hydroxyl groups, produces a path distortion effect on the pore structure, increasing the resistance to chloride ion migration. Phytic acid and zirconium nitrate form a stable coordination structure, which complexes and fixes chloride ions, achieving a synergistic effect of physical barrier and chemical fixation, thus significantly improving the corrosion resistance and long-term service durability of concrete in high chloride salt environments. Attached Figure Description
[0018] The invention will now be further described with reference to the accompanying drawings.
[0019] Figure 1 The image shows a comparison of the infrared spectra of the polyethylene glycol-α-cyclodextrin complex and the synergistically modified organic-inorganic topological network structure. Detailed Implementation
[0020] The present invention will be further described below with reference to specific embodiments. However, the present invention is not limited to the following embodiments. Equivalent adjustments made without departing from the spirit and essence of the present invention should also be considered to fall within the protection scope of the present invention.
[0021] Example 1: The purpose of this example is to verify the basic resistance of the material to chloride salt corrosion when the components and reaction conditions are within the lower limit range.
[0022] S1, 20 parts of polyethylene glycol and 10 parts of α-cyclodextrin were added to a mixed solvent of 10 parts of deionized water and 20 parts of ethanol, and stirred at 200 r / min for 2 h at 40 °C to allow α-cyclodextrin to attach to the polyethylene glycol molecular chain to form a polyrotaxane structure; then 5 parts of 2,5-dihydroxyterephthalaldehyde and 1 part of melamine were added, and stirred at 300 r / min for 3 h at 50 °C and pH 6 to form a dynamic covalent cross-linked network; then 2 parts of octa(3-aminopropyl)silsesquioxane were added, and stirred at 300 r / min for 2 h at 60 °C to generate a synergistically modified organic-inorganic topological network structure; S2, 80 parts of methoxy polyethylene glycol monomethacrylate, 1 part of 2,6-dihydroxytriptene, and 0.5 parts of triethanolamine were added to 50 parts of deionized water and stirred at 200 r / min for 1 h at 20 °C to generate an organic functional precursor solution; then 5 parts of nano silica and 10 parts of silica sol were added, stirred at 300 r / min at 25 °C and ultrasonically treated for 1 h to generate an organic-inorganic composite dispersion; S3, add 5 parts of synergistically modified organic-inorganic topological network structure, 2 parts of phytic acid and 0.5 parts of zirconium nitrate to the organic-inorganic composite dispersion, stir at 300 r / min for 2 h at 30℃ and pH 6 to generate a high-durability chloride-resistant concrete admixture composition.
[0023] Example 2: The purpose of this example is to verify that the overall performance of the material is optimal when all components and reaction conditions are within the median range.
[0024] S1, 40 parts of polyethylene glycol and 25 parts of α-cyclodextrin were added to a mixed solvent of 30 parts of deionized water and 50 parts of ethanol, and reacted at 60°C and 350 r / min for 5 h to form a stable polyrotaxane structure; then 15 parts of 2,5-dihydroxyterephthalaldehyde and 5 parts of melamine were added, and reacted at 70°C and pH 7 and 450 r / min for 6 h to construct a dynamic covalent crosslinked network; then 8 parts of octa(3-aminopropyl)silsesquioxane were added, and reacted at 80°C and 500 r / min for 4 h to generate a synergistically modified organic-inorganic topological network structure; Figure 1 Infrared spectral comparison reveals that the modified sample exhibits a significantly broadened and enhanced –OH absorption peak at 3400 cm⁻¹, indicating enhanced hydrogen bonding. A new C=N characteristic peak appears near 1650 cm⁻¹, suggesting a condensation reaction between 2,5-dihydroxyterephthalaldehyde and melamine to form a Schiff base structure. A significantly enhanced Si–O–Si absorption peak near 1050 cm⁻¹ indicates the successful introduction of octa(3-aminopropyl)silsesquioxane and the formation of an inorganic network structure. An enhanced C–O–C peak at 1100 cm⁻¹ indicates the stable existence of the polyrotaxane structure. Overall, this demonstrates the successful construction of an organic-inorganic synergistic topological network structure. S2, 100 parts of methoxy polyethylene glycol monomethacrylate, 5 parts of 2,6-dihydroxytriptene, and 4 parts of triethanolamine were added to 100 parts of deionized water and reacted at 35°C with stirring at 400 r / min for 2 h to generate an organic functional precursor solution; then 15 parts of nano silica and 25 parts of silica sol were added, and the mixture was stirred at 45°C with stirring at 500 r / min and ultrasonically treated for 3 h to generate an organic-inorganic composite dispersion; S3, 15 parts of synergistically modified organic-inorganic topological network structure, 8 parts of phytic acid and 2.5 parts of zirconium nitrate were added to the organic-inorganic composite dispersion, and the mixture was stirred at 500 r / min for 4 h at 50℃ and pH 7 to generate a high-durability concrete admixture composition resistant to chloride salt erosion.
[0025] Example 3: The purpose of this example is to verify the material performance change trend when each component and reaction condition are within the upper limit range.
[0026] S1, 60 parts of polyethylene glycol and 40 parts of α-cyclodextrin were added to a mixed solvent of 50 parts of deionized water and 80 parts of ethanol, and the mixture was stirred at 80°C for 500 r / min for 8 h to fully form a polyrotaxane structure; then 25 parts of 2,5-dihydroxyterephthalaldehyde and 10 parts of melamine were added, and the mixture was stirred at 90°C and pH 9 for 600 r / min for 10 h to construct a highly cross-linked dynamic network; then 15 parts of octa(3-aminopropyl)silsesquioxane were added, and the mixture was stirred at 100°C for 700 r / min for 6 h to generate a synergistically modified organic-inorganic topological network structure; S2, 120 parts of methoxy polyethylene glycol monomethacrylate, 10 parts of 2,6-dihydroxytriptene, and 8 parts of triethanolamine were added to 150 parts of deionized water and reacted at 50°C with stirring at 600 r / min for 4 h to generate an organic functional precursor solution; then 25 parts of nano silica and 40 parts of silica sol were added, and the mixture was stirred at 60°C with stirring at 800 r / min and ultrasonically treated for 5 h to generate an organic-inorganic composite dispersion; S3, 30 parts of synergistically modified organic-inorganic topological network structure, 15 parts of phytic acid and 5 parts of zirconium nitrate were added to the organic-inorganic composite dispersion, and the mixture was stirred at 700 r / min for 6 h at 70℃ and pH 8 to generate a high-durability concrete admixture composition resistant to chloride salt erosion.
[0027] Comparative Example 1: The purpose of this comparative example is to verify the effect of using only a single organic topology structure for modification on the material properties in synergistically modified organic-inorganic topology network structures.
[0028] S1, 40 parts of polyethylene glycol and 25 parts of α-cyclodextrin are added to a mixed solvent of 30 parts of deionized water and 50 parts of ethanol, and the mixture is stirred at 350 r / min at 60°C for 5 h to form a stable polyrotaxane structure and generate a single topological intermediate. S2, 100 parts of methoxy polyethylene glycol monomethacrylate, 5 parts of 2,6-dihydroxytriptene, and 4 parts of triethanolamine were added to 100 parts of deionized water and reacted at 35°C with stirring at 400 r / min for 2 h to generate an organic functional precursor solution; then 15 parts of nano silica and 25 parts of silica sol were added, and the mixture was stirred at 45°C with stirring at 500 r / min and ultrasonically treated for 3 h to generate an organic-inorganic composite dispersion; S3, 15 parts of a single topological structure intermediate, 8 parts of phytic acid and 2.5 parts of zirconium nitrate were added to an organic-inorganic composite dispersion, and the mixture was stirred at 500 r / min for 4 h at 50℃ and pH 7 to generate a concrete admixture composition.
[0029] Comparative Example 2: The purpose of this comparative example is to verify the effect of dynamic covalent crosslinking modification on the material properties of synergistically modified organic-inorganic topological network structures.
[0030] S1, 15 parts of 2,5-dihydroxyterephthalaldehyde and 5 parts of melamine were added to a mixed solvent of 30 parts of deionized water and 50 parts of ethanol. The mixture was stirred at 450 r / min for 6 h at 70 °C and pH 7 to form a dynamic covalent cross-linked network and generate a single cross-linked network intermediate. S2, 100 parts of methoxy polyethylene glycol monomethacrylate, 5 parts of 2,6-dihydroxytriptene, and 4 parts of triethanolamine were added to 100 parts of deionized water and reacted at 35°C with stirring at 400 r / min for 2 h to generate an organic functional precursor solution; then 15 parts of nano silica and 25 parts of silica sol were added, and the mixture was stirred at 45°C with stirring at 500 r / min and ultrasonically treated for 3 h to generate an organic-inorganic composite dispersion; S3, 15 parts of a single cross-linking network intermediate, 8 parts of phytic acid and 2.5 parts of zirconium nitrate were added to an organic-inorganic composite dispersion, and the mixture was stirred at 500 r / min for 4 h at 50℃ and pH 7 to generate a concrete admixture composition.
[0031] Comparative Example 3: The purpose of this comparative example is to verify the effect of not introducing the small organic molecule 2,6-dihydroxytriptene on the material properties.
[0032] S1, 40 parts of polyethylene glycol and 25 parts of α-cyclodextrin were added to a mixed solvent of 30 parts of deionized water and 50 parts of ethanol, and the mixture was stirred at 350 r / min for 5 h at 60 °C to form a stable polyrotaxane structure; then 15 parts of 2,5-dihydroxyterephthalaldehyde and 5 parts of melamine were added, and the mixture was stirred at 450 r / min for 6 h at 70 °C and pH 7 to construct a dynamic covalent crosslinked network; then 8 parts of octa(3-aminopropyl)silsesquioxane were added, and the mixture was stirred at 500 r / min for 4 h at 80 °C to generate a synergistically modified organic-inorganic topological network structure; S2, 100 parts of methoxy polyethylene glycol monomethacrylate and 4 parts of triethanolamine were added to 100 parts of deionized water and stirred at 35°C for 400 r / min for 2 h to generate an organic functional precursor solution; then 15 parts of nano silica and 25 parts of silica sol were added, stirred at 45°C for 500 r / min and ultrasonically treated for 3 h to generate an organic-inorganic composite dispersion; S3, 15 parts of synergistically modified organic-inorganic topological network structure, 8 parts of phytic acid and 2.5 parts of zirconium nitrate were added to the organic-inorganic composite dispersion, and the mixture was stirred at 500 r / min for 4 h at 50℃ and pH 7 to generate a concrete admixture composition.
[0033] Performance testing: 1. Chloride ion permeation flux test A rapid chloride ion penetration test method was used to test the concrete specimens prepared in each embodiment and comparative example. The specimens were cut into specified dimensions after standard curing for 28 days and vacuum saturated with water. Sodium chloride solution and sodium hydroxide solution were added to both sides of the specimen, respectively. Under specified voltage conditions, an electric current was applied for 6 hours, and the total electric flux through the specimen was recorded to evaluate the material's ability to resist chloride ion penetration. The lower the electric flux, the better the resistance to chloride salt corrosion.
[0034] 2. Chloride ion diffusion coefficient test An unsteady-state chloride ion migration test method was used to test concrete specimens cured to a specified age. The chloride ion migration process was accelerated under the action of an electric field. The chloride ion diffusion coefficient was obtained by measuring the penetration depth of chloride ions in the specimen and combining it with relevant calculation formulas to evaluate the ability of the material's internal structure to hinder chloride ion migration. The lower the diffusion coefficient, the stronger the material's density and erosion resistance.
[0035] 3. Impermeability test The concrete permeability test method was adopted. After each group of specimens was cured under standard curing conditions to the specified age, water pressure was applied in progressively increasing steps. The maximum permeability pressure level when water seepage occurred was recorded to evaluate the overall density and water permeability resistance of the material. The higher the permeability resistance level, the denser the pore structure and the stronger the resistance to chloride salt corrosion.
[0036] 4. Reinforcing steel corrosion potential test Reinforcing bars were embedded in concrete specimens prepared with different formulations and subjected to accelerated corrosion tests in a chloride solution environment. The degree of corrosion of the reinforcing bars was evaluated by measuring the changes in the electrode potential of the reinforcing bars. The more negative the potential value, the more obvious the corrosion tendency. This was used to judge the difference in the protective ability of the admixture system for the reinforcing bars. The more stable the potential, the better the resistance to chloride corrosion.
[0037] Table 1. Performance test results of each embodiment and comparative example.
[0038] As shown in Table 1, there are significant differences between the embodiments and the comparative examples in terms of chloride ion flux, chloride ion diffusion coefficient, impermeability grade and steel corrosion potential. The embodiments all show better overall performance than the comparative examples, indicating that the admixture system constructed by the present invention can effectively improve the resistance of concrete to chloride salt erosion.
[0039] From the perspective of chloride ion flux and diffusion coefficient, Example 2 has the lowest values, which are 820C and 3.8×10-12m2 / s, respectively, indicating that it has the strongest ability to block chloride ion migration. Examples 1 and 3 are next, while the comparative examples are significantly higher than the examples, indicating that the synergistic modification of organic-inorganic topological network structures has a significant effect on reducing the connectivity of ion transport channels and increasing the tortuosity of diffusion paths.
[0040] Based on the results of impermeability performance, Example 2 showed the highest impermeability grade at 1.8 MPa. All examples were higher than the comparative example, indicating that the system can effectively optimize the internal pore structure of concrete, reduce pore connectivity, and improve material density, thereby enhancing the barrier ability against water and chloride media.
[0041] The corrosion potential test results of the steel bars show that the potential values of the embodiments are significantly higher than those of the comparative examples. The potential of Embodiment 2 is -210mV, with the least corrosion tendency, while the potential of the comparative examples is more negative. This indicates that in the absence of synergistic structures or key components, chloride ions are more likely to invade and induce steel bar corrosion, further verifying the advantages of the present invention system in steel bar protection.
[0042] Analysis of the comparative examples shows that when the synergistic modified structure lacks synergistic effect or key organic small molecules are not introduced into the system, the material's resistance to chloride ion penetration, impermeability, and corrosion resistance all decrease significantly, indicating that there is a significant synergistic enhancement effect among the functional components.
[0043] In summary, this invention achieves densification of concrete pore structure and effective control of chloride ion transport path through multi-scale structural regulation and multi-component synergistic effect, making the overall performance of the embodiments significantly better than that of the comparative examples. Among them, Example 2 shows the best performance in all indicators, demonstrating excellent resistance to chloride salt corrosion and engineering application value.
Claims
1. A high-durability, chloride-resistant concrete admixture composition, characterized in that, The composition comprises the following raw materials in parts by weight: 80-120 parts of methoxy polyethylene glycol monomethacrylate; 5-30 parts of synergistically modified organic-inorganic topological network structure; 1-10 parts of 2,6-dihydroxytriptene; 5-25 parts of nano-silica; 10-40 parts of silica sol; 2-15 parts of phytic acid; 0.5-5 parts of zirconium nitrate; 0.5-8 parts of triethanolamine; and 50-150 parts of deionized water. The synergistically modified organic-inorganic topological network structure is a three-dimensional synergistic topological structure formed by constructing a polyrotaxane slip ring structure with polyethylene glycol segments and α-cyclodextrin as the topological framework, and dynamically covalently crosslinking it with 2,5-dihydroxyterephthalaldehyde and melamine, while using octa(3-aminopropyl)silsesquioxane as inorganic cage nodes for spatial confinement modification.
2. The high-durability chloride-resistant concrete admixture composition according to claim 1, characterized in that, The synergistically modified organic-inorganic topological network structure comprises the following raw materials in parts by weight: 20-60 parts of polyethylene glycol; 10-40 parts of α-cyclodextrin; 5-25 parts of 2,5-dihydroxyterephthalaldehyde; 2-15 parts of octa(3-aminopropyl)silsesquioxane; 1-10 parts of melamine; and 20-80 parts of ethanol.
3. A high-durability, chloride-resistant concrete admixture composition according to claim 1 or 2, characterized in that, The preparation method of the synergistically modified organic-inorganic topological network structure includes the following steps: (1) Polyethylene glycol is mixed with α-cyclodextrin, so that α-cyclodextrin is attached to the polyethylene glycol molecular chain to construct a polyrotaxane topology and generate a polyrotaxane intermediate; (2) Add 2,5-dihydroxyterephthalaldehyde and melamine to the polyrotaxane intermediate to cause a condensation reaction to form a dynamic covalent cross-linking network, thereby generating an organic topological cross-linking intermediate; (3) Add octa(3-aminopropyl)silsesquioxane to the organic topological crosslinking intermediate for composite embedding, so that it forms an inorganic cage-like confined structure in the network, and generates a synergistically modified organic-inorganic topological network structure.
4. The high-durability chloride-resistant concrete admixture composition according to claim 3, characterized in that, The reaction conditions for step (1) are: temperature of 40-80℃, reaction time of 2-8h, stirring speed of 200-500r / min, and system of water / ethanol mixed solvent.
5. The high-durability chloride-resistant concrete admixture composition according to claim 3, characterized in that, The reaction conditions for step (2) are: temperature of 50-90℃, reaction time of 3-10h, pH of 6-9, and stirring speed of 300-600r / min.
6. The high-durability chloride-resistant concrete admixture composition according to claim 3, characterized in that, The reaction conditions for step (3) are a temperature of 60-100℃, a reaction time of 2-6h, a stirring speed of 300-700r / min, and are carried out under an inert atmosphere.
7. A method for preparing a high-durability, chloride-resistant concrete admixture composition, characterized in that, The preparation method includes the following steps: S1, add methoxy polyethylene glycol monomethacrylate, 2,6-dihydroxytriphenylene and triethanolamine to deionized water and mix and disperse them, stirring evenly to generate an organic functional precursor solution; S2, add nano-silica and silica sol to the organic functional precursor solution for composite dispersion treatment to form a uniform inorganic dispersion system and generate an organic-inorganic composite dispersion. S3 involves adding synergistically modified organic-inorganic topological network structures, phytic acid, and zirconium nitrate to an organic-inorganic composite dispersion for compound mixing, allowing each component to fully interact and form a stable system, thereby generating a high-durability, chloride-resistant concrete admixture composition.
8. The method for preparing a high-durability, chloride-resistant concrete admixture composition according to claim 7, characterized in that, The reaction conditions for step S1 are a temperature of 20–50°C, a reaction time of 1–4 h, and a stirring speed of 200–600 r / min.
9. The method for preparing a high-durability chloride-resistant concrete admixture composition according to claim 7, characterized in that, The reaction conditions for step S2 are a temperature of 25–60°C, a reaction time of 1–5 h, a stirring speed of 300–800 r / min, and ultrasonic dispersion treatment.
10. The method for preparing a high-durability, chloride-resistant concrete admixture composition according to claim 7, characterized in that, The reaction conditions for step S3 are: temperature of 30–70°C, reaction time of 2–6 h, stirring speed of 300–700 r / min, and pH of the system of 6–8.