A concrete impermeable material and a preparation method and application thereof

Abstract

The application belongs to the technical field of concrete impermeable materials, and specifically provides a concrete impermeable material, a preparation method and application thereof, the concrete impermeable material comprises the following raw materials in parts by weight: cement 100-130 parts, microsilica powder 25-40 parts, fly ash 20-25 parts, PBA composite material 10-15 parts, polyurea 7-12 parts, bentonite 5-10 parts, silane coupling agent 2-3 parts, and water reducing agent 1.5-2 parts; the PBA composite material is a core-shell structure with modified chitosan as a shell and Zn-Co nanoparticles as a core. The concrete impermeable material prepared by the application has the advantage of good impermeability.

Description

Technical Field

[0001] This application belongs to the technical field of concrete impermeable materials, and in particular relates to a concrete impermeable material, its preparation method, and its application. Background Technology

[0002] Durability failure of concrete structures is a primary challenge facing infrastructure. Chloride ions and structural water seepage are particularly problematic, leading to performance degradation and durability failure, which has long constrained the safety and service life of engineering structures. Chloride ions or water molecules, as penetrating media, penetrate the pore network of concrete to the surface of reinforcing steel, damaging its passivation film and triggering electrochemical corrosion. Therefore, developing anti-permeability materials capable of long-term, stable curing of chloride ions and other penetrating media is a core scientific issue and key technology for improving the service life of concrete.

[0003] Technicians typically employ chemical bonding or physical adsorption methods to improve the impermeability of concrete. For example, chemical bonding utilizes the aluminate phase in cement and the hydration product, monosulfo-type hydrated calcium sulfoaluminate, which reacts with chloride ions to form Friedel salts. This is a primary form of chloride ion fixation through chemical bonding. However, this method has two inherent drawbacks: first, its capacity is limited, as the chemical bonding capacity depends entirely on the total aluminate mineral content in the cement, exhibiting a definite saturation threshold; second, it suffers from environmental instability, as Friedel salts are pH-sensitive compounds. When the pH of the pore fluid decreases due to carbonation in the concrete, Friedel salts decompose, leading to the re-release of fixed chloride ions and resulting in "secondary infiltration."

[0004] Physical adsorption utilizes materials with high specific surface area or special layered structures, such as layered double hydroxides, zeolites, and silica fume, to capture chloride ions through physical adsorption and anion exchange. While this method provides some additional chloride ion storage capacity, it still has significant drawbacks: Firstly, the presence of various anions in concrete pore fluid strongly competes for interlayer sites, severely inhibiting the selective exchange capacity for chloride ions. Secondly, chloride ion adsorption is a reversible ion exchange process with limited adsorption strength; when the external chloride ion concentration decreases or the pH changes drastically, there is a risk of desorption, making permanent fixation impossible. Thirdly, in complex cement hydration environments, the adsorption structure may dissolve or remodel, leading to a decline in ion exchange performance over time.

[0005] Currently, achieving stable curing of concrete with high capacity, high selectivity, and irreversibility against permeating media such as chloride ions throughout its entire life cycle, especially in dynamic environments such as carbonation, wet-dry cycles, and sulfate attack, is of practical significance and value. Summary of the Invention

[0006] To address the aforementioned issues and further improve the impermeability of concrete under complex service environments, this application provides a concrete impermeability material, its preparation method, and its application.

[0007] This application first provides a concrete impermeable material, comprising the following raw materials in parts by weight: 100-130 parts cement, 25-40 parts silica fume, 20-25 parts fly ash, 10-15 parts PBA composite material, 7-12 parts polyurea, 5-10 parts bentonite, 2-3 parts silane coupling agent, and 1.5-2 parts water-reducing agent; wherein the PBA composite material is a core-shell structure with modified chitosan as the shell and Zn-Co nanoparticles as the core.

[0008] Furthermore, the PBA composite material is prepared using the following method:

[0009] 1) Dissolve cobalt nitrate and zinc nitrate in deionized water to obtain a cobalt-zinc precursor solution. Then, add the cobalt-zinc precursor solution dropwise to a trisodium citrate solution and stir to obtain a mixed solution.

[0010] 2) Add potassium ferricyanide solution dropwise to the mixture, stir the reaction in an ice-water bath for 3-5 hours, centrifuge the resulting reaction solution, wash the separated product with deionized water and ethanol, and then redisperse it in deionized water to obtain a dispersion.

[0011] 3) Take the dispersion, adjust the pH to 6.5, and then add chitosan / acetic acid mixed solution dropwise. After the addition is complete, add EDC and NHS and stir to react. After the reaction is complete, add calcium chloride solution and 2-aldehyde phenylboronic acid solution dropwise, stir overnight, centrifuge, wash and dry the final product.

[0012] Furthermore, in step 1), the molar ratio of cobalt nitrate, zinc nitrate, and trisodium citrate in the mixture is (0.6-0.7):(0.3-0.35):1.

[0013] Furthermore, in step 2), the molar ratio of potassium ferricyanide to trisodium citrate is 1:(1-1.15).

[0014] Furthermore, in step 2), the centrifugation is performed at a speed of 12000-15000 rpm for 10-15 minutes.

[0015] Furthermore, in step 3), the mass ratio of chitosan to acetic acid in the chitosan / acetic acid mixed solution is 1:(1-1.5).

[0016] Furthermore, in step 3), the pH value is adjusted to 6.5 using an organic base.

[0017] Furthermore, the organic base is a quaternary ammonium base or a quaternary phosphorus base.

[0018] This application also provides a method for preparing a concrete impermeable material, comprising the following steps: mixing cement, silica fume, fly ash, PBA composite material, polyurea, bentonite, silane coupling agent and water-reducing agent evenly in proportion to obtain the material.

[0019] This application also provides an application of a concrete impermeable material, which is used in water conservancy facilities and building construction.

[0020] Compared with the prior art, this application has the following beneficial effects:

[0021] This application uses silica fume, fly ash, and bentonite as inorganic filler components, which can form an anti-seepage sealing system with cementitious gel materials, achieving good sealing and anti-seepage effects for point, line, and surface leakage such as cracks. Furthermore, polyurea and PBA composite materials are introduced into the system. The polyurea material can further fill finer micro-nano cracks, inhibiting the transmission and diffusion of permeable media. In addition, the PBA composite material utilizes multiple mechanisms such as ion exchange / coordination and electrostatic adsorption, resulting in a higher chloride ion capture capacity and a certain degree of resistance to the displacement effect of other anions, exhibiting a more stable anti-seepage effect. Moreover, the PBA composite material of this application can form a certain degree of bonding with concrete hydration products, enabling better compatibility with the concrete microstructure, helping to improve the pore structure, and overall enhancing the anti-seepage performance of concrete under complex service environments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the test data of the concrete impermeability of Examples 1-2 and Control Groups 1-2 of this application. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] When using “including,” “having,” and “contains” as described herein, the intention is to cover non-exclusive inclusion, unless an explicit qualifying term such as “only,” “consisting of,” etc., is used, in which case another component may be added.

[0026] The terms "preferred," "more preferably," "better," and "even better" used in this application refer to embodiments of this application that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this application. That is, in this application, "preferred," "more preferably," "better," and "even better" are merely descriptions of implementations or embodiments with better effects, but do not constitute a limitation on the scope of protection of this application.

[0027] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0028] In this application, "at least one" means one or more, such as one, two, or more. "Multiple" or "several" means at least two, such as two, three, etc., and "multi-layered" means at least two layers, such as two layers, three layers, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0029] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0030] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, the method comprising steps (a) and (b) indicates that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0031] In this application, "above" or "below" includes the number itself. For example, "below 1" includes 1.

[0032] In this application, room temperature refers to 0~40℃, including but not limited to 10~40℃, or further to 20~30℃.

[0033] Based on extensive experimental research, this application provides a concrete impermeable material comprising the following raw materials in parts by weight: 100-130 parts cement, 25-40 parts silica fume, 20-25 parts fly ash, 10-15 parts PBA composite material, 7-12 parts polyurea, 5-10 parts bentonite, 2-3 parts silane coupling agent, and 1.5-2 parts water-reducing agent; wherein the PBA composite material is a core-shell structure with modified chitosan as the shell and Zn-Co nanoparticles as the core.

[0034] Furthermore, the PBA composite material is prepared using the following method:

[0035] 1) Dissolve cobalt nitrate and zinc nitrate in deionized water to obtain a cobalt-zinc precursor solution. Then, add the cobalt-zinc precursor solution dropwise to a trisodium citrate solution and stir to obtain a mixed solution.

[0036] 2) Add potassium ferricyanide solution dropwise to the mixture, stir the reaction in an ice-water bath for 3-5 hours, centrifuge the resulting reaction solution, wash the separated product with deionized water and ethanol, and then redisperse it in deionized water to obtain a dispersion.

[0037] 3) Take the dispersion, adjust the pH to 6.5, and then add chitosan / acetic acid mixed solution dropwise. After the addition is complete, add EDC and NHS and stir to react. After the reaction is complete, add calcium chloride solution and 2-aldehyde phenylboronic acid solution dropwise, stir overnight, centrifuge, wash and dry the final product.

[0038] Furthermore, in step 1), the molar ratio of cobalt nitrate, zinc nitrate, and trisodium citrate in the mixture is (0.6-0.7):(0.3-0.35):1.

[0039] Furthermore, in step 2), the molar ratio of potassium ferricyanide to trisodium citrate is 1:(1-1.15).

[0040] In some specific embodiments, in step 2), the molar ratio of potassium ferricyanide to trisodium citrate can be 1:1, 1:1.05, 1:1.1, 1:1.15, 1:1.2, 1:1.25, 1:1.3, 1:1.35, 1:1.4, 1:1.45, or 1:1.5. Generally, in step 2), a molar ratio of 1:1 or 1:1.05 yields better experimental results.

[0041] Furthermore, in step 2), the centrifugation is performed at a speed of 12000-15000 rpm for 10-15 minutes.

[0042] Furthermore, in step 3), the mass ratio of chitosan to acetic acid in the chitosan / acetic acid mixed solution is 1:(1-1.5).

[0043] In some specific embodiments, in step 3), the mass ratio of chitosan to acetic acid in the chitosan / acetic acid mixed solution can be 1:1, 1:1.15, 1:1.2, 1:1.25, 1:1.3, 1:1.35, 1:1.4, 1:1.45, or 1:15. Generally, in step 3), a mass ratio of 1:1.2 or 1:1.25 yields better experimental results.

[0044] Furthermore, in step 3), the pH value is adjusted to 6.5 using an organic base.

[0045] Furthermore, the organic base is a quaternary ammonium base or a quaternary phosphorus base.

[0046] More preferably, the quaternary ammonium base is tetrabutylammonium hydroxide. The quaternary phosphorus base is tetrabutylphosphine hydroxide.

[0047] This application also provides a method for preparing a concrete impermeable material, comprising the following steps: mixing cement, silica fume, fly ash, PBA composite material, polyurea, bentonite, silane coupling agent and water-reducing agent evenly in proportion to obtain the material.

[0048] This application also provides an application of a concrete impermeable material, which is used in water conservancy facilities and building construction.

[0049] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0050] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this application, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. All reagents or instruments whose manufacturers are not specified are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description in this application, any prior art methods, equipment, and materials similar to or equivalent to those described, used, or made by the methods, equipment, and materials in the embodiments of this application may be used to implement this application.

[0051] Example 1

[0052] The concrete impermeable material of this embodiment includes the following raw materials by weight: 12kg cement, 3.5kg silica fume, 2kg fly ash, 1.25kg PBA composite material, 0.85kg polyurea, 0.75kg bentonite, 250g silane coupling agent, and 100g water-reducing agent.

[0053] The cement used is ordinary Portland cement, grade 42.5. The silica fume is low-expansion silica fume. The fly ash is Grade I fly ash. The bentonite is sodium-based bentonite. The silane coupling agent is KH550. The water-reducing agent is polycarboxylate superplasticizer.

[0054] The PBA composite material in this embodiment was prepared using the following method:

[0055] 1) Dissolve 8.73g of cobalt nitrate and 2.38g of zinc nitrate in 500mL of deionized water to obtain a cobalt-zinc precursor solution; dissolve 8.23g of potassium ferricyanide in 500mL of deionized water to prepare a potassium ferricyanide solution for later use; weigh 7.35g of sodium citrate dihydrate and dissolve it in 200mL of deionized water to prepare a trisodium citrate solution; then slowly add the aforementioned cobalt-zinc precursor solution dropwise to the trisodium citrate solution and stir to obtain a mixed solution;

[0056] 2) The aforementioned potassium ferricyanide solution was slowly added dropwise to the mixture, and the reaction was stirred vigorously in an ice-water bath for 5 hours. Then, the mixture was aged overnight at room temperature. The resulting reaction solution was centrifuged at 12,000 rpm for 15 minutes. The resulting precipitate was washed with deionized water and ethanol, and then redispersed in 500 mL of deionized water to obtain a dispersion.

[0057] 3) Take the aforementioned dispersion, adjust the pH to 6.5 with tetrabutylammonium hydroxide, maintain a 60°C water bath, and then add 500 mL of a 5 wt% chitosan / acetic acid mixed solution. The mass ratio of chitosan to acetic acid in the chitosan / acetic acid mixed solution is 1:1.25. After the addition is complete, add 0.192 g EDC and 0.288 g NHS and stir to react. After the reaction is complete, add 100 mL of 0.5 mol / L calcium chloride solution and 30 mL of 0.15 mol / L 2-aldehyde phenylboronic acid solution, stir overnight, and centrifuge, wash, and dry the final product.

[0058] The method for preparing concrete impermeable material in this embodiment includes the following steps: cement, silica fume, fly ash, PBA composite material, polyurea, bentonite, silane coupling agent and water-reducing agent are placed in a high-speed mixer and mixed evenly according to the above proportions to obtain the final product.

[0059] Example 2

[0060] The concrete impermeable material of this embodiment includes the following raw materials by weight: 12kg cement, 3.5kg silica fume, 2kg fly ash, 1.25kg PBA composite material, 0.85kg polyurea, 0.75kg bentonite, 250g silane coupling agent, and 100g water-reducing agent.

[0061] The cement used is ordinary Portland cement, grade 42.5. The silica fume is low-expansion silica fume. The fly ash is Grade I fly ash. The bentonite is sodium-based bentonite. The silane coupling agent is KH550. The water-reducing agent is polycarboxylate superplasticizer.

[0062] The PBA composite material in this embodiment was prepared using the following method:

[0063] 1) Dissolve 8.73g of cobalt nitrate and 2.38g of zinc nitrate in 500mL of deionized water to obtain a cobalt-zinc precursor solution; dissolve 8.23g of potassium ferricyanide in 500mL of deionized water to prepare a potassium ferricyanide solution for later use; weigh 7.35g of sodium citrate dihydrate and dissolve it in 200mL of deionized water to prepare a trisodium citrate solution; then slowly add the aforementioned cobalt-zinc precursor solution dropwise to the trisodium citrate solution and stir to obtain a mixed solution;

[0064] 2) The aforementioned potassium ferricyanide solution was slowly added dropwise to the mixture, and the reaction was stirred vigorously in an ice-water bath for 5 hours. Then, the mixture was aged overnight at room temperature. The resulting reaction solution was centrifuged at 12,000 rpm for 15 minutes. The resulting precipitate was washed with deionized water and ethanol, and then redispersed in 500 mL of deionized water to obtain a dispersion.

[0065] 3) Take the aforementioned dispersion, adjust the pH to 6.5 with tetrabutylphosphine hydroxide, maintain a 60°C water bath, and then add 500 mL of a 5 wt% chitosan / acetic acid mixed solution. The mass ratio of chitosan to acetic acid in the chitosan / acetic acid mixed solution is 1:1.25. After the addition is complete, add 0.192 g EDC and 0.288 g NHS and stir to react. After the reaction is complete, add 200 mL of 0.5 mol / L calcium chloride solution and 50 mL of 0.15 mol / L 2-aldehyde phenylboronic acid solution, stir overnight, and centrifuge, wash, and dry the final product.

[0066] The method for preparing concrete impermeable material in this embodiment includes the following steps: cement, silica fume, fly ash, PBA composite material, polyurea, bentonite, silane coupling agent and water-reducing agent are placed in a high-speed mixer and mixed evenly according to the above proportions to obtain the final product.

[0067] Control group 1

[0068] The concrete impermeable material in this control group included the following raw materials by weight: 12 kg cement, 3.5 kg silica fume, 2 kg fly ash, 0.85 kg polyurea, 0.75 kg bentonite, 250 g silane coupling agent, and 100 g water-reducing agent.

[0069] The cement used is ordinary Portland cement, grade 42.5. The silica fume is low-expansion silica fume. The fly ash is Grade I fly ash. The bentonite is sodium-based bentonite. The silane coupling agent is KH550. The water-reducing agent is polycarboxylate superplasticizer.

[0070] The preparation method of the concrete impermeable material in this control group includes the following steps: cement, silica fume, fly ash, polyurea, bentonite, silane coupling agent and water-reducing agent are placed in a high-speed mixer and mixed evenly according to the above proportions.

[0071] Control group 2

[0072] The concrete impermeability-resistant materials in this control group included the following raw materials by weight: 12 kg cement, 3.5 kg silica fume, 2 kg fly ash, 1.25 kg PBA composite material, 0.85 kg polyurea, 0.75 kg bentonite, 250 g silane coupling agent, and 100 g water-reducing agent.

[0073] The cement used is ordinary Portland cement, grade 42.5. The silica fume is low-expansion silica fume. The fly ash is Grade I fly ash. The bentonite is sodium-based bentonite. The silane coupling agent is KH550. The water-reducing agent is polycarboxylate superplasticizer.

[0074] The PBA composite material in this control group was prepared using the following method:

[0075] 1) Dissolve 8.73g of cobalt nitrate and 2.38g of zinc nitrate in 500mL of deionized water to obtain a cobalt-zinc precursor solution; dissolve 8.23g of potassium ferricyanide in 500mL of deionized water to prepare a potassium ferricyanide solution for later use; weigh 7.35g of sodium citrate dihydrate and dissolve it in 200mL of deionized water to prepare a trisodium citrate solution; then slowly add the aforementioned cobalt-zinc precursor solution dropwise to the trisodium citrate solution and stir to obtain a mixed solution;

[0076] 2) Slowly add the aforementioned potassium ferricyanide solution dropwise to the mixture, stir vigorously in an ice-water bath for 5 hours, then age overnight at room temperature, centrifuge the resulting reaction solution at 12000 rpm for 15 minutes, wash the resulting separated product with deionized water and ethanol, and dry it to obtain the final product.

[0077] The preparation method of the concrete impermeable material in this control group includes the following steps: cement, silica fume, fly ash, PBA composite material, polyurea, bentonite, silane coupling agent and water-reducing agent are placed in a high-speed mixer and mixed evenly according to the above proportions.

[0078] Performance testing

[0079] The concrete impermeable material, coarse aggregate, and fine aggregate from Examples 1-2 and Control Groups 1-2 were mixed and stirred for 5 minutes. Water was then added and mixing continued for another 5 minutes. The mixture was then poured into molds, vibrated to compact, and demolded after 24 hours. The samples were then cured in a standard curing room (temperature 20±2℃, RH>90%) for 28 days. Samples were obtained after curing for later use. The composition and mixing parameters of the samples were as follows: natural sand as fine aggregate, 5-15mm crushed stone as coarse aggregate, water-cement ratio of 0.4, and gelling agent content of 530 kg / m³. 3 The fine aggregate content is 600 kg / m³. 3 The amount of coarse aggregate used is 900 kg / m³. 3 .

[0080] The above samples were taken, and the electrical flux method in GB / T 50082-2024 "Standard for Test Methods of Long-Term Performance and Durability of Concrete" was used to test the chloride ion penetration resistance of concrete by accelerating chloride ion diffusion with an applied electric field. The test blocks, cured for 28 days, were saturated with water using a vacuum saturation machine. After vacuum saturation, the electrical flux of the test blocks was measured for 6 hours using a Nilder PEU-type intelligent electrical flux meter. The test blocks were placed in an electrolytic cell, with prepared NaCl and NaOH solutions poured into both ends of the cell. A 60V voltage was applied through a high-precision DC power supply to establish a stable electric field gradient, and the electrical flux at different times was recorded in real time. The test results are as follows: Figure 1 As shown.

[0081] analyze Figure 1It can be seen that the concrete impermeable material of this application has excellent impermeability, especially with a better barrier effect against chloride ions. The lower electrical flux at the same time indicates better resistance to chloride ion penetration.

[0082] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A concrete impermeable material, characterized by: The raw materials include cement 100-130 parts, microsilica 25-40 parts, fly ash 20-25 parts, PBA composite material 10-15 parts, polyurea 7-12 parts, bentonite 5-10 parts, silane coupling agent 2-3 parts, and water reducing agent 1.5-2 parts by weight. 1) Dissolve cobalt nitrate and zinc nitrate in deionized water to obtain a cobalt-zinc precursor solution, then drop the cobalt-zinc precursor solution into a trisodium citrate solution to obtain a mixed solution; 2) Drop potassium ferricyanide solution into the mixed solution, stir and react in an ice water bath for 3-5 h, centrifuge the obtained reaction solution, wash the obtained separation with deionized water and ethanol, then re-disperse in deionized water to obtain a dispersion; 3) Take the dispersion, adjust the pH value to 6.5, then add a chitosan / acetic acid mixed solution dropwise, after the dropwise addition is completed, add EDC and NHS and stir to react, after the reaction is completed, drop calcium chloride solution and 2-aldehyde benzene boronic acid solution, stir overnight, centrifuge and wash the final product, and dry to obtain the product.

2. The concrete impermeable material of claim 1, wherein: In the step 1), the molar ratio of cobalt nitrate, zinc nitrate and trisodium citrate in the mixed solution is (0.6-0.7):(0.3-0.35):

1.

3. The concrete impermeable material of claim 1, wherein: In the step 2), the molar ratio of potassium ferricyanide to trisodium citrate is 1:(1-1.15).

4. The concrete impermeable material of claim 1, wherein: In the step 2), the centrifugation is performed at a speed of 12000-15000 rpm for 10-15 min.

5. The concrete impermeable material of claim 1, wherein: In the step 3), the mass ratio of chitosan to acetic acid in the chitosan / acetic acid mixed solution is 1:(1-1.5).

6. The concrete impermeable material of claim 1, wherein: In the step 3), the pH value is adjusted to 6.5 by using an organic base.

7. The concrete impermeable material of claim 6, wherein: The organic base is a quaternary ammonium base or a quaternary phosphonium base.

8. A method of producing a concrete impermeable material as claimed in claim 1, characterized in that: The steps include mixing cement, microsilica, fly ash, PBA composite material, polyurea, bentonite, silane coupling agent and water reducing agent in a proportion to obtain the concrete anti-permeation material.

9. Use of a concrete impermeable material, characterized in that: The concrete anti-permeation material of any one of claims 1-7 is used in water conservancy facilities and building construction.

Images