Anti-corrosion concrete as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of constructional engineering materials, and particularly relates to anti-corrosion concrete as well as a preparation method and application thereof. The anti-corrosion concrete is prepared from the following raw materials: Portland cement, fly ash, mineral powder, coarse sand, gravel, a polycarboxylic acid water reducer, an early strength agent, an air entraining agent, imidazolium ionic liquid and carbon modified g-C3N4. The imidazolium ionic liquid and the carbon modified g-C3N4 are added into the concrete, so that the compressive strength and the corrosion resistance of the concrete can be coordinately improved, and the prepared concrete is particularly suitable for the fields of municipal drainage systems and the like with high corrosion resistance requirements on concrete materials.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction engineering materials, and in particular relates to corrosion-resistant concrete and a preparation method and application thereof. Background Art

[0002] The municipal drainage system is a core component for maintaining urban hydrological cycles and environmental sanitation. Most municipal drainage uses concrete drainage ditches, but traditional concrete materials face many challenges in their application.

[0003] Urban soils may contain various chemical contaminants, such as salt, industrial residues, and other corrosive substances. Furthermore, drainage systems are exposed to the complex urban environment for a long time. These factors combine to cause erosion and degradation of ditch materials. Chloride and sulfate ions, in particular, in salt, can react with calcium compounds in concrete to form expansive salts, leading to cracking and spalling of the concrete structure. Furthermore, natural phenomena such as ultraviolet radiation, temperature fluctuations, air pollution, and cyclical freeze-thaw cycles can also damage concrete drainage systems. For example, temperature fluctuations cause concrete to expand and contract, leading to cracks; ultraviolet radiation accelerates concrete aging; and air pollution and freeze-thaw cycles further weaken concrete's strength and durability. Biological factors are also important. Concrete structures in urban drainage systems may be susceptible to plant root penetration, microbial attachment, and dirt deposition, accelerating material erosion and system degradation.

[0004] Currently, the solution to these defects in concrete ditches is regular inspection and repair, which not only increases the maintenance cost of urban infrastructure but may also affect the normal operation of the city.

[0005] Improving the performance of existing concrete materials is crucial, which requires new concrete materials to have excellent impermeability and corrosion resistance, as well as good mechanical properties and the ability to maintain long-term stability under complex urban environmental conditions, so as to reduce maintenance requirements and extend service life. Summary of the Invention

[0006] In order to solve the above problems, the present invention first provides a corrosion-resistant concrete.

[0007] The present invention adopts the following technical solutions:

[0008] A corrosion-resistant concrete is composed of the following raw materials in parts by weight:

[0009] Portland cement: 300-350 parts;

[0010] Fly ash: 30-40 parts;

[0011] Mineral powder: 35-45 parts;

[0012] Water: 130-150 parts;

[0013] Coarse sand: 400-600 parts;

[0014] Medium coarse sand: 100-200 parts;

[0015] Crushed stone: 900-1000 parts;

[0016] Polycarboxylate water reducer: 3-5 parts;

[0017] 1-3 parts of early strength agent;

[0018] 1-2 parts of air-entraining agent;

[0019] Imidazole ionic liquid: 1.8-6.5 parts;

[0020] Carbon modified g-C3N4: 0.4-3.5 parts.

[0021] Preferably, it is composed of the following raw materials in parts by mass:

[0022] Portland cement: 310-335 parts;

[0023] Fly ash: 30-40 parts;

[0024] Mineral powder: 40-45 parts;

[0025] Water: 130-140 parts;

[0026] Coarse sand: 400-500 parts;

[0027] Medium coarse sand: 100-200 parts;

[0028] Crushed stone: 900-950 parts;

[0029] Polycarboxylate water reducer: 3.2-4.8 parts;

[0030] 1-2 parts of early strength agent;

[0031] 1-2 parts of air-entraining agent;

[0032] Imidazole ionic liquid: 1.9-6.3 parts;

[0033] Carbon modified g-C3N4: 0.4-3.4 parts.

[0034] Preferably, it is composed of the following raw materials in parts by mass:

[0035] Portland cement: 315 parts;

[0036] Fly ash: 33 parts;

[0037] Mineral powder: 38 parts;

[0038] Water: 135 parts;

[0039] Coarse sand: 450 parts;

[0040] Medium coarse sand: 120 parts;

[0041] Crushed stone: 925 parts;

[0042] Polycarboxylate water reducer: 3.5 parts;

[0043] 1.5 parts of early strength agent;

[0044] 1.2 parts of air-entraining agent;

[0045] Imidazole ionic liquid: 3.9 parts;

[0046] Carbon-modified g-C3N4: 1.9 parts.

[0047] Preferably, the imidazole ionic liquid is 1-carboxyethyl-3-methylimidazole phosphate.

[0048] Preferably, the carbon-modified g-C3N4 is carbon-doped 3-s-triazine structure C3N4.

[0049] Preferably, the silicate cement is P42.5R silicate cement with a density of 2700 kg / m 3 ; The fly ash is Class I fly ash; the mineral powder is Class S95 mineral powder.

[0050] Preferably, the coarse sand is river sand with a fineness modulus of 3.1-3.7; the medium-coarse sand is river sand with a fineness modulus of 2.3-3.0.

[0051] Preferably, the crushed stone has a particle size of 10-20 mm and a density of 2800-3000 kg / m 3 .

[0052] Preferably, the early strength agent is lignin sulfonate and / or triethanolamine.

[0053] Preferably, the air entraining agent is any one or more combinations of rosin soap, alkylbenzene sulfonate, and fatty alcohol polyoxyethylene ether.

[0054] In this application, carbon-modified g-C3N4 can be prepared by referring to the following method:

[0055] S1. Place melamine and glucose in a beaker, add ultrapure water, and stir in a 70°C water bath until the water evaporates completely. Remove the solid and grind it evenly to obtain a mixed precursor.

[0056] S2. Place the mixed precursor in a muffle furnace for gradient heating at a heating rate of 5°C / min to 180-350°C. After calcination for 0.5-2h, continue to heat to 500-550°C, calcine for 3-5h, and cool to obtain the desired carbon-modified g-C3N4.

[0057] The present invention further provides a method for preparing the corrosion-resistant concrete as described above, comprising the following steps:

[0058] S1. Raw material pretreatment: dry-mix the carbon-modified g-C3N4 with the mineral powder for 10 minutes to obtain a premixed powder; wet the coarse sand, medium-coarse sand, and gravel 24 hours in advance to a stable moisture content and set aside; mix the imidazole ionic liquid, the water reducer, and 50 to 70% of the total amount of water to obtain a first premixed solution; dissolve the accelerator in 30 to 50% of the total amount of water to obtain a second premixed solution;

[0059] S2. Add Portland cement, fly ash, pretreated coarse sand, medium-coarse sand, crushed stone, and premixed powder to a mixer and dry mix until the color is uniform. Then, add the first premix and stir evenly. Then, add the second premix and stir evenly. Finally, add the air-entraining agent and stir evenly to obtain the desired corrosion-resistant concrete.

[0060] Preferably, the method further comprises a curing step, wherein the anti-corrosion concrete is vibrated layer by layer, the surface is polished, covered with a plastic film, and continuously sprayed with water for curing in a dry environment for at least 14 days to obtain cured anti-corrosion concrete.

[0061] Finally, the present invention provides a use of the corrosion-resistant concrete described above in preparing prefabricated municipal drainage ditch components.

[0062] The beneficial effects of the present invention are:

[0063] 1) Comprehensive improvements in concrete performance are achieved through the rational proportioning of ingredients such as Portland cement, fly ash, mineral powder, water, coarse sand, medium-coarse sand, crushed stone, polycarboxylate high-performance water reducer, early strength accelerator, air-entraining agent, imidazole ionic liquid, and carbon-modified g-C3N4. The combined use of Portland cement and fly ash not only enhances the concrete's basic strength, but also its fine filling effect densifies the concrete, enhancing its impermeability and corrosion resistance. Furthermore, the active ingredients in fly ash react with cement hydration products, further improving the concrete's later strength. The addition of mineral powder further refines the concrete's microstructure and increases its density. The precise proportion of water ensures the concrete's fluidity and pumpability while minimizing excess water, thus preventing the loss of concrete strength caused by excessive water. The graded filling of coarse and medium-coarse sand effectively reduces voids within the concrete, improves its pore structure, and makes the concrete denser, enhancing its impermeability and corrosion resistance. The rational use of crushed stone ensures the concrete's skeletal strength, while the addition of high-performance polycarboxylic acid-based admixtures significantly improves concrete's performance, including fluidity, pumpability, and water retention. This also reduces the water-cement ratio, further enhancing the concrete's impermeability and frost resistance. The use of early-strengthening agents and air-entraining agents not only increases concrete's early strength but also improves its pore structure and impermeability by introducing tiny, independent bubbles.

[0064] 2) The choice of 1-carboxyethyl-3-methylimidazole phosphate as an imidazole ionic liquid takes both cost and performance into consideration. 1-carboxyethyl-3-methylimidazole phosphate has low viscosity and high permeability, allowing it to quickly penetrate cracks and micropores in concrete. By filling the voids, it forms a dense gel structure, reducing defects within the concrete. This improves the density of the concrete and enhances its compressive and tensile strengths. At the same time, the 1-carboxyethyl-3-methylimidazole phosphate ion solution can optimize the hydration reaction of cement and promote the formation of hydration products (such as CSH gel). By improving the microstructure of concrete, the early and long-term strength of concrete is increased. Furthermore, the 1-carboxyethyl-3-methylimidazole phosphate ion solution can improve the interfacial transition zone (ITZ) between aggregate and cement paste in concrete, enhancing bond strength. By improving the toughness of concrete, the generation and expansion of cracks are reduced.

[0065] 3) Compared with ordinary g-C3N4, carbon-modified g-C3N4 can be used as a nanofiller to enhance the mechanical properties of concrete, including compressive strength, flexural strength and tensile strength, due to its unique structure and properties. Its nano-size effect can fill the pores in concrete, reduce porosity, thereby reducing the permeability of concrete and improving its anti-permeability performance. At the same time, carbon-modified g-C3N4 can serve as a protective layer to reduce the contact of concrete with harmful chemicals (such as chloride ions, sulfates, etc.) and improve the corrosion resistance of concrete. Carbon-modified g-C3N4 also has stronger photocatalytic properties, which can decompose organic pollutants on the surface of concrete and give concrete self-cleaning ability. DETAILED DESCRIPTION

[0066] Unless otherwise specified, the terms used herein have the meanings commonly understood by those skilled in the art.

[0067] The technical solution of the present invention is described in more detail below with reference to the embodiments.

[0068] Example 1

[0069] A corrosion-resistant concrete is composed of the following raw materials in parts by weight:

[0070] 315 parts of Portland cement, 33 parts of fly ash, 38 parts of mineral powder, 135 parts of water, 450 parts of coarse sand, 120 parts of medium-coarse sand, 925 parts of crushed stone, 3.5 parts of polycarboxylate water reducer, 1.5 parts of early strength agent, 1.2 parts of air entraining agent, 1.9 parts of imidazole ionic liquid, and 0.4 parts of carbon-modified g-C3N4.

[0071] The above-mentioned imidazole ionic liquid is [C2COOHMIM]H2PO4, and the silicate cement is P42.5R silicate cement with a density of 2700kg / m 3 The fly ash is Grade I fly ash; the mineral powder is Grade S95 mineral powder; the coarse sand is river sand with a fineness modulus of 3.1-3.7 and an average particle size of more than 0.5 mm; the medium-coarse sand is river sand with a fineness modulus of 2.3-3.0 and an average particle size of 0.35-0.5 mm; the particle size of the crushed stone is 10-20 mm, and the density is 2910 kg / m 3 The early strength agent is composed of lignin sulfonate and triethanolamine in a mass ratio of 1:2; the air entraining agent is composed of rosin soap, alkylbenzene sulfonate and fatty alcohol polyoxyethylene ether in a mass ratio of 1:3:1.5.

[0072] The above-mentioned polycarboxylate water reducer can be prepared by referring to the following method:

[0073] S1. The methoxy polyethylene glycol and methacrylic acid are reacted in the presence of a catalyst, toluenesulfonic acid, and a polymerization inhibitor to synthesize methoxy polyethylene glycol methacrylate;

[0074] S2. Dissolve the synthesized methoxy polyethylene glycol methacrylate in 260-280 parts by weight of water to obtain a first solution. Dissolve the remaining methacrylic acid and hydroxyalkyl acrylate in 40-60 parts by weight of water to obtain a second solution. Dissolve the reducing agent sodium hypophosphite in 40-60 parts by weight of water to obtain a third solution. Dissolve tartaric acid in 40-60 parts by weight of water to obtain a fourth solution.

[0075] S3. Add the oxidizing agent, ammonium persulfate, along with the remaining water, to the reactor. After stirring and dissolving at 5-40°C, add the first, second, third, and fourth solutions dropwise simultaneously over a period of 1-3 hours. Maintain the temperature for 1-2 hours after the additions are complete to allow the copolymerization reaction to proceed. After the copolymerization reaction is complete, adjust the pH to 6.0-7.0 with 32% sodium hydroxide to obtain a clear solution, which is the polycarboxylate water-reducing agent.

[0076] Carbon-modified g-C3N4 was prepared according to the following process: melamine (5 g) and glucose (600 mg) were weighed and placed in a beaker, and 40 ml of ultrapure water was added. The mixture was stirred in a 70°C water bath stirrer until the water evaporated completely. The solid was taken out and ground evenly to obtain a mixed precursor. Then, the mixed precursor was placed in a muffle furnace for gradient heating, and the temperature was increased to 350°C at a heating rate of 5°C / min and heated at 350°C for 2 hours; the temperature was continued to be increased to 550°C at the same heating rate, and heated at 550°C for 4 hours. The mixture was naturally cooled to room temperature, and the block product was ground into powder. The unreacted carbon particles were removed by washing with 0.1 mol / L HNO3, washed with deionized water until neutral, and dried in vacuum at 60°C for 12 hours to obtain carbon-modified g-C3N4.

[0077] Imidazole ionic liquid [C2COOHMIM]H2PO4 was prepared according to the following process:

[0078] S1. A condenser, a constant pressure dropping funnel, a thermometer, and a magnetic stirrer were installed in a 250 mL three-necked flask. Nitrogen was introduced to maintain an inert atmosphere in the reaction system. 1-Methylimidazole (10.0 g, 0.122 mol) and acetonitrile (50 mL) were added to the flask and stirred until completely dissolved. Ethyl bromopropionate (21.8 g, 0.122 mol) was added to the dropping funnel. Magnetic stirring was turned on (500 rpm). Ethyl bromopropionate was slowly added dropwise (control the dropping rate at 1-2 mL / min). The reaction temperature was controlled at 65 ° C (oil bath heating) to avoid violent exotherm. The reaction was maintained for 24 hours. The reaction endpoint was monitored by TLC (developing solvent: ethyl acetate / methanol = 8:2). The reaction was stopped after the disappearance of the raw material 1-methylimidazole;

[0079] S2. After stopping the reaction, the reaction system was cooled to room temperature and acetonitrile was removed by vacuum distillation. 50 mL of ether was added to precipitate a white solid, which was filtered and washed with 3×20 mL of ether. Vacuum drying (40°C, 2 hours) gave a white solid [C2COOEtMIM]Br. [C2COOEtMIM]Br (22.5 g, 0.075 mol) was dissolved in 100 mL of 1 M NaOH aqueous solution. Reflux and stir at 80°C for 6 hours. TLC confirmed complete hydrolysis of the ester group. After cooling, 6 M HCl was added dropwise to pH 2-3 to precipitate a white precipitate. Filter the precipitate, wash with deionized water until neutral, and vacuum dry to obtain [C2COOHMIM]Br.

[0080] S3. Dissolve [C2COOHMIM]Br (18.0 g, 0.068 mol) in 100 mL of deionized water. Add sodium dihydrogen phosphate (NaH2PO4, 8.2 g, 0.068 mol) and stir at room temperature for 6 hours. Filter to remove the resulting NaBr precipitate. Concentrate the filtrate by rotary evaporation (50°C) to a viscous consistency. Dissolve the mixture in 50 mL of acetone and filter again to remove any residual NaBr. Freeze-dry the filtrate (-50°C, 24 hours) to obtain [C2COOHMIM]H2PO4 as a white solid.

[0081] The above preparation method is only a reference for this specific embodiment, and is not a limitation on the materials used in the application. Those skilled in the art can still obtain the required raw materials through other legal channels.

[0082] The preparation method of the above-mentioned corrosion-resistant concrete is:

[0083] S1. Raw material pretreatment: dry-mix the carbon-modified g-C3N4 with the mineral powder for 10 minutes to obtain a premixed powder; wet the coarse sand, medium-coarse sand, and gravel 24 hours in advance to a stable moisture content and set aside; mix the imidazole ionic liquid, the water reducer, and 50 to 70% of the total amount of water to obtain a first premixed solution; dissolve the accelerator in 30 to 50% of the total amount of water to obtain a second premixed solution;

[0084] S2. Add Portland cement, fly ash, pretreated coarse sand, medium-coarse sand, crushed stone, and premixed powder to a mixer and dry mix until the color is uniform. Then, add the first premix and stir evenly. Then, add the second premix and stir evenly. Finally, add the air-entraining agent and stir evenly to obtain the desired corrosion-resistant concrete.

[0085] Example 2

[0086] A corrosion-resistant concrete, the raw materials and preparation method used are the same as those in Example 1, except that the raw materials are composed of the following parts by weight:

[0087] 315 parts of Portland cement, 33 parts of fly ash, 38 parts of mineral powder, 135 parts of water, 450 parts of coarse sand, 120 parts of medium-coarse sand, 925 parts of crushed stone, 3.5 parts of polycarboxylate water reducer, 1.5 parts of early strength agent, 1.2 parts of air entraining agent, 3.9 parts of imidazole ionic liquid, and 1.9 parts of carbon-modified g-C3N4.

[0088] Example 3

[0089] A corrosion-resistant concrete, the raw materials and preparation method used are the same as those in Example 1, except that the raw materials are composed of the following parts by weight:

[0090] 315 parts of Portland cement, 33 parts of fly ash, 38 parts of mineral powder, 135 parts of water, 450 parts of coarse sand, 120 parts of medium-coarse sand, 925 parts of crushed stone, 3.5 parts of polycarboxylate water reducer, 1.5 parts of early strength agent, 1.2 parts of air entraining agent, 5.8 parts of imidazole ionic liquid, and 3.1 parts of carbon-modified g-C3N4.

[0091] Comparative Example

[0092] Set up 7 comparison ratios according to Table 1 below:

[0093] Table 1 Comparative Examples 1-7 Ingredients

[0094]

[0095]

[0096] The properties of the concrete obtained in Comparative Examples 1-7 and Examples 1-3 were tested.

[0097] The test concrete was continuously sprayed with water for 14 days in a dry environment to ensure that the ionic liquid was fully involved in the hydration reaction.

[0098] 1) Compressive strength test: Refer to GB / T 50081-2019 "Standard for Test Methods for Physical and Mechanical Properties of Concrete", the specimens used were 150×150×150 standard test blocks, and the testing machine loading speed was 0.5 MPa / s.

[0099] 2) Chloride Ion Permeation Quantity (Electric Flux Method): With reference to ASTM C1202-22, Standard Test Method for Chloride Ion Permeability of Concrete, a φ100 × 50 cylindrical specimen was used. After vacuum saturation with water and surface drying, a 3% NaCl solution (cathode) and a 0.3 mol / L NaOH solution (anode) were injected at both ends of the specimen. A 60 V DC voltage was applied, and the amount of electricity (coulomb value, C) passing through the specimen was recorded over a 6-hour period.

[0100] 3) Sulfate attack strength loss: Referring to GB / T 50082-2009 "Standard for test methods for long-term performance and durability of ordinary concrete", standard test blocks of 100×100×100 were selected, and the attack solution was 5% Na2SO4 solution (pH 6-8). The control group was tested for compressive strength (fc) after 28 days of standard curing. The experimental group was immersed in sodium sulfate solution, and the solution was changed every 30 days. The compressive strength fs was tested after 90 days. The strength loss rate was (fc-fs) / fc×100%.

[0101] 4) Splitting tensile strength: Refer to GB / T 50081-2019 "Standard for Test Methods for Physical and Mechanical Properties of Concrete". The test blocks are 150×150×150 standard test blocks, standard curing for 28 days, loading along the center, and the pads are perpendicular to the compressive surface.

[0102] The results are shown in Table 2.

[0103] Table 2 Performance test results

[0104]

[0105]

[0106] It can be seen that adding 1-carboxyethyl-3-methylimidazole phosphate and carbon-modified g-CN can improve concrete crack resistance, corrosion resistance and strength, and embodiment 2 is more centered than embodiment 1 and 3 addition, but is most significantly improved in concrete performance. In addition, imidazole ionic liquid and modified g-CN can improve certain performance when used alone. However, when 1-carboxyethyl-3-methylimidazole phosphate and carbon-modified g-CN are used in combination, concrete performance is significantly improved, and both have certain synergistic effects. It is speculated that ionic liquid fills microcracks, and carbon-modified g-CN fills pores, and jointly improves the density of concrete, and ionic liquid optimizes hydration reaction, and carbon-modified g-CN provides corrosion protection, jointly improves the strength of concrete.

[0107] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A corrosion-resistant concrete, characterized in that: It is composed of the following raw materials in parts by weight: Portland cement: 300-350 parts; Fly ash: 30-40 parts; Mineral powder: 35-45 parts; Water: 130-150 parts; Coarse sand: 400-600 parts; Medium coarse sand: 100-200 parts; Crushed stone: 900-1000 parts; Polycarboxylate water reducer: 3-5 parts; 1-3 parts of early strength agent; 1-2 parts of air-entraining agent; Imidazole ionic liquid: 1.8-6.5 parts; Carbon modified g-C3N4: 0.4-3.5 parts.

2. The corrosion-resistant concrete according to claim 1, characterized in that: It is composed of the following raw materials in parts by weight: Portland cement: 315 parts; Fly ash: 33 parts; Mineral powder: 38 parts; Water: 135 parts; Coarse sand: 450 parts; Medium coarse sand: 120 parts; Crushed stone: 925 parts; Polycarboxylate water reducer: 3.5 parts; 1.5 parts of early strength agent; 1.2 parts of air-entraining agent; Imidazole ionic liquid: 3.9 parts; Carbon-modified g-C3N4: 1.9 parts.

3. The corrosion-resistant concrete according to claim 1 or 2, characterized in that: The imidazole ionic liquid is 1-carboxyethyl-3-methylimidazole phosphate.

4. The corrosion-resistant concrete according to claim 1 or 2, characterized in that: The carbon-modified g-C3N4 is carbon-doped 3-s-triazine structure C3N4.

5. The corrosion-resistant concrete according to claim 1 or 2, characterized in that: The silicate cement is P42.5R silicate cement with a density of 2700 kg / m 3 ; The fly ash is Class I fly ash; the mineral powder is Class S95 mineral powder.

6. The corrosion-resistant concrete according to claim 1 or 2, characterized in that: The coarse sand is river sand with a fineness modulus of 3.1-3.7; the medium-coarse sand is river sand with a fineness modulus of 2.3-3.0; the crushed stone has a particle size of 10-20 mm and a density of 2800-3000 kg / m 3 .

7. The corrosion-resistant concrete according to claim 1 or 2, characterized in that: The early strength agent is selected from lignin sulfonate and / or triethanolamine.

8. The corrosion-resistant concrete according to claim 1 or 2, characterized in that: The air entraining agent is any one or more combinations of rosin soap, alkylbenzene sulfonate, and fatty alcohol polyoxyethylene ether.

9. A method for preparing corrosion-resistant concrete according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Raw material pretreatment: dry-mix the carbon-modified g-C3N4 with the mineral powder for 10 minutes to obtain a premixed powder; wet the coarse sand, medium-coarse sand, and gravel 24 hours in advance to a stable moisture content and set aside; mix the imidazole ionic liquid, the water reducer, and 50 to 70% of the total amount of water to obtain a first premixed solution; dissolve the accelerator in 30 to 50% of the total amount of water to obtain a second premixed solution; S2. Add Portland cement, fly ash, pretreated coarse sand, medium-coarse sand, crushed stone, and premixed powder to a mixer and dry mix until the color is uniform. Then, add the first premix and stir evenly. Then, add the second premix and stir evenly. Finally, add the air-entraining agent and stir evenly to obtain the desired corrosion-resistant concrete.

10. The method for preparing corrosion-resistant concrete according to claim 9, wherein: The method further includes a curing step, wherein the anti-corrosion concrete is vibrated in layers, the surface is polished, covered with a plastic film, and continuously sprayed with water in a dry environment for at least 14 days to obtain cured anti-corrosion concrete.

11. Use of the corrosion-resistant concrete according to any one of claims 1 to 8 in preparing prefabricated municipal drainage ditch components.

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