Functional material for concrete capable of resisting erosion by high concentration of complex salt

Abstract

The application discloses a functional material for concrete capable of resisting erosion of high-concentration composite salt. The functional material comprises the following components in parts by weight: functional filler 150-300 parts, water reducing agent 10-20 parts, anti-sulfate erosion agent 15-30 parts, anti-chloride salt erosion agent 20-40 parts, preservative 2-5 parts, and air entraining agent 5-10 parts. The functional material is used for preparing concrete, and can improve the strength and the anti-sulfate and chloride salt erosion capacity of the concrete. The granulated blast furnace slag powder and the molybdenum tailing powder are combined in the material components, so that the mechanical properties of the concrete are improved; the modified red mud and the modified magnesium-aluminum hydrotalcite are combined, so that the anti-sulfate erosion capacity of the concrete is improved; and the magnesium oxide and the floating bead are combined, so that the anti-chloride salt erosion capacity of the concrete is improved, and the effects are synergistic.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of concrete, and particularly relates to a functional material for concrete capable of resisting high-concentration composite salt erosion. BACKGROUND

[0002] Under the environment of super-high-concentration composite salt, concrete will face the dual challenges of physical erosion and chemical erosion. From the physical aspect, super-high-concentration sulfate in the pores of concrete will continuously dissolve and crystallize with the change of environmental temperature and humidity, the volume of the formed crystal will expand, a huge crystallization pressure will be generated, the internal pore structure of concrete will be damaged, cracks will be generated and expanded, the strength of concrete will be reduced, the surface will be eroded, and in severe cases, the structure will even be disintegrated. From the chemical aspect, sulfate will react with the cement hydration product in concrete to generate expansive substances such as ettringite and gypsum, the generation of a large amount of ettringite will significantly increase the volume of the solid phase of concrete, internal stress will be generated, concrete will expand and crack, the internal structure will become loose, and the internal structure of concrete will be damaged. Super-high-concentration chloride salt will destroy the passivation film of the steel bars in concrete, expose the steel bars to the corrosion environment, cause the steel bars to rust, cause the steel bars to expand in volume, and then cause the concrete protective layer to crack and peel off, and severely weaken the bearing capacity of the structure. Under the multi-factor coupling erosion of high-concentration sulfate, chloride salt and other factors, the erosion degree of concrete is aggravated due to the interaction of factors such as temperature, humidity and stress change of concrete, the solubility of salt increases at high temperature, crystallization is more likely to occur after cooling, high humidity promotes salt dissolution and diffusion, dry-wet cycle accelerates surface salting out and crystallization, greatly accelerates the erosion speed, when concrete is eroded by composite salt and its performance deteriorates, its bearing capacity will inevitably decrease, the structural stability will be seriously threatened, and the service life of the water conservancy project will be greatly shortened.

[0003] The large-scale, super-high-concentration composite salt erosion environment is rarely seen in previous projects, and there is no ready-made engineering application case to be used for reference in the aspect of concrete prevention and control technology. If the technical measures are not appropriate, it will bring hidden troubles of erosion and damage to concrete, and will greatly shorten the expected service life of the project. Therefore, the research on the damage of super-high-concentration composite salt to concrete can not only resist multiple erosion threats and ensure that the concrete has good durability, but also ensure that the concrete can maintain good mechanical properties in the composite salt environment for a long time, so that it can stably bear various external loads and improve the stability of the engineering structure. SUMMARY

[0004] The present application belongs to the technical field of concrete, and particularly relates to a functional material for concrete capable of resisting high-concentration composite salt erosion.

[0005] A functional material for concrete that can resist high concentrations of compound salt erosion comprises the following components in parts by weight: 150-300 parts of functional filler, 10-20 parts of water-reducing agent, 15-30 parts of sulfate erosion resistant agent, 20-40 parts of chloride erosion resistant agent, 2-5 parts of corrosion inhibitor, and 5-10 parts of air-entraining agent.

[0006] The functional filler is one or more of the following: limonite powder, wollastonite powder, sepiolite powder, granulated blast furnace slag powder, molybdenum tailings powder, iron tailings powder, and bentonite tailings powder.

[0007] The functional filler is a mixture of granulated blast furnace slag powder and molybdenum tailings powder mixed in a mass ratio of 1:1.

[0008] The water-reducing agent is one or more of the following: calcium lignosulfonate, sodium lignosulfonate, lignosulfonate propanesulfonate, TH-928 water-reducing agent, and ASP aminosulfonate high-efficiency water-reducing agent.

[0009] The anti-sulfate erosion agent is a mixture of modified red mud and modified magnesium aluminum hydrotalcite in a mass ratio of 2:1.

[0010] The modified red mud is prepared by the following method: take red mud and crush it to 300-600 mesh, add 0.5-2 times the weight of water, adjust the pH to 8-9, add 10-20% of the red mud mass of 3-aminopropyltriethoxysilane, stir and react for 1-3 hours, calcine at 150-250℃ for 1-3 hours, cool to room temperature, and obtain modified red mud.

[0011] The modified magnesium-aluminum hydrotalcite is prepared by the following method: calcining the magnesium-aluminum hydrotalcite at 500-700℃ for 30-60 min to obtain calcined magnesium-aluminum hydrotalcite, and pulverizing it to 300-600 mesh; taking the calcined magnesium-aluminum hydrotalcite, adding 2-4 times its mass of anhydrous ethanol, and then adding 3-8% of titanate ester by mass of magnesium-aluminum hydrotalcite, stirring at a constant temperature of 60-85℃ for 80-120 min, stopping stirring and keeping warm for 1-3 h until the anhydrous ethanol has completely evaporated, and cooling to room temperature to obtain modified magnesium-aluminum hydrotalcite.

[0012] The antichloride salt corrosion agent is a mixture of magnesium oxide and cenospheres in a mass ratio of 1:1.

[0013] The preservative is one or more of sodium methylparaben, sodium ethylparaben, boric acid, parabens, and sodium diacetate; the air-entraining agent is one or more of rosin soap, sodium dodecylbenzene sulfonate, sodium fatty alcohol polyoxyethylene ether sulfonate, and ZY-99.

[0014] The application of functional materials for concrete that can resist high concentrations of compound salt erosion in the preparation of concrete.

[0015] The beneficial effects of this invention are as follows: The functional material of this invention is used to prepare concrete, improving the strength and resistance to sulfate and chloride erosion. The combination of granulated blast furnace slag powder and molybdenum tailings powder in the material composition improves the mechanical properties of the concrete; the combination of modified red mud and modified magnesium aluminum hydrotalcite improves the concrete's resistance to sulfate erosion; and the combination of magnesium oxide and cenospheres improves the concrete's resistance to chloride erosion, with synergistic effects. Detailed Implementation

[0016] To facilitate understanding of the present invention, a more comprehensive description will be given below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0017] Example 1

[0018] A functional material for concrete that can resist high-concentration compound salt erosion comprises the following components in parts by weight: 200 parts functional filler, 15 parts calcium lignosulfonate, 20 parts sulfate erosion resistant agent, 30 parts chloride erosion resistant agent, 3 parts sodium methylparaben, and 8 parts sodium dodecylbenzene sulfonate; wherein the functional filler is a mixture of granulated blast furnace slag powder and molybdenum tailings powder in a mass ratio of 1:1; the sulfate erosion resistant agent is a mixture of modified red mud and modified magnesium aluminum hydrotalcite in a mass ratio of 2:1; and the chloride erosion resistant agent is a mixture of magnesium oxide and cenospheres in a mass ratio of 1:1.

[0019] The modified red mud is prepared by the following method: take red mud and crush it to 500 mesh, add water in equal parts by weight, adjust the pH to 8.5, add 3-aminopropyltriethoxysilane accounting for 15% of the red mud mass, stir and react for 2 hours, calcine at 200℃ for 2 hours, and cool to room temperature to obtain modified red mud.

[0020] The modified magnesium-aluminum hydrotalcite was prepared by the following method: the magnesium-aluminum hydrotalcite was calcined at 600℃ for 45 min to obtain calcined magnesium-aluminum hydrotalcite, which was then pulverized to 500 mesh; the calcined magnesium-aluminum hydrotalcite was taken, and three times its mass of anhydrous ethanol was added, followed by 6% titanate ester by mass of magnesium-aluminum hydrotalcite. The mixture was stirred at 75℃ for 100 min, and then the stirring was stopped and the mixture was kept at the same temperature for 2 h until the anhydrous ethanol had completely evaporated. The mixture was then cooled to room temperature to obtain the modified magnesium-aluminum hydrotalcite.

[0021] Example 2

[0022] A functional material for concrete that can resist high-concentration compound salt erosion comprises the following components in parts by weight: 80 parts of limonite powder, 80 parts of wollastonite powder, 12 parts of sodium lignosulfonate, 16 parts of antisulfuric acid erosion agent, 22 parts of antichlorite erosion agent, 2 parts of sodium paraben, and 5 parts of rosin soap; wherein the antisulfuric acid erosion agent is a mixture of modified red mud and modified magnesium aluminum hydrotalcite in a mass ratio of 2:1; and the antichlorite erosion agent is a mixture of magnesium oxide and cenospheres in a mass ratio of 1:1.

[0023] The modified red mud is prepared by the following method: take red mud and crush it to 350 mesh, add 0.5 parts by weight of water, adjust the pH to 8, add 10% of the red mud mass of 3-aminopropyltriethoxysilane, stir and react for 3 hours, calcine at 150°C for 3 hours, and cool to room temperature to obtain modified red mud.

[0024] The modified magnesium-aluminum hydrotalcite was prepared by the following method: the magnesium-aluminum hydrotalcite was calcined at 500℃ for 30 min to obtain calcined magnesium-aluminum hydrotalcite, which was then pulverized to 300 mesh; the calcined magnesium-aluminum hydrotalcite was taken, and two times its mass of anhydrous ethanol was added, followed by 3% titanate ester by mass of magnesium-aluminum hydrotalcite. The mixture was stirred at 60℃ for 80 min, and then the stirring was stopped and the mixture was kept at the same temperature for 3 h until the anhydrous ethanol had completely evaporated. The mixture was then cooled to room temperature to obtain the modified magnesium-aluminum hydrotalcite.

[0025] Example 3

[0026] A functional material for concrete that can resist high-concentration compound salt erosion comprises the following components in parts by weight: 150 parts iron tailings powder, 150 parts bentonite tailings powder, 20 parts TH-928 water-reducing agent, 30 parts sulfate erosion resistant agent, 40 parts chloride erosion resistant agent, 5 parts parabens, and 10 parts sodium fatty alcohol polyoxyethylene ether sulfonate; wherein the sulfate erosion resistant agent is a mixture of modified red mud and modified magnesium aluminum hydrotalcite in a mass ratio of 2:1; and the chloride erosion resistant agent is a mixture of magnesium oxide and cenospheres in a mass ratio of 1:1.

[0027] The modified red mud is prepared by the following method: take red mud and crush it to 600 mesh, add 2 parts by weight of water, adjust the pH to 9, add 20% of the red mud mass of 3-aminopropyltriethoxysilane, stir and react for 3 hours, calcine at 250℃ for 1 hour, and cool to room temperature to obtain modified red mud.

[0028] The modified magnesium-aluminum hydrotalcite was prepared by the following method: the magnesium-aluminum hydrotalcite was calcined at 700℃ for 30 min to obtain calcined magnesium-aluminum hydrotalcite, which was then pulverized to 600 mesh; the calcined magnesium-aluminum hydrotalcite was taken, and 4 times its mass of anhydrous ethanol was added, followed by 8% titanate ester by mass of magnesium-aluminum hydrotalcite. The mixture was stirred at 85℃ for 120 min, and then the stirring was stopped and the mixture was kept at the same temperature for 2 h until the anhydrous ethanol had completely evaporated. The mixture was then cooled to room temperature to obtain the modified magnesium-aluminum hydrotalcite.

[0029] Comparative Example 1

[0030] A functional material for concrete that can resist high-concentration compound salt erosion comprises the following components in parts by weight: 200 parts granulated blast furnace slag powder, 15 parts calcium lignosulfonate, 20 parts sulfate erosion resistant agent, 30 parts chloride erosion resistant agent, 3 parts sodium methylparaben, and 8 parts sodium dodecylbenzene sulfonate; wherein the sulfate erosion resistant agent is a mixture of modified red mud and modified magnesium aluminum hydrotalcite in a mass ratio of 2:1; and the chloride erosion resistant agent is a mixture of magnesium oxide and cenospheres in a mass ratio of 1:1.

[0031] The modified red mud is prepared by the following method: take red mud and crush it to 500 mesh, add water in equal parts by weight, adjust the pH to 8.5, add 3-aminopropyltriethoxysilane accounting for 15% of the red mud mass, stir and react for 2 hours, calcine at 200℃ for 2 hours, and cool to room temperature to obtain modified red mud.

[0032] The modified magnesium-aluminum hydrotalcite was prepared by the following method: the magnesium-aluminum hydrotalcite was calcined at 600℃ for 45 min to obtain calcined magnesium-aluminum hydrotalcite, which was then pulverized to 500 mesh; the calcined magnesium-aluminum hydrotalcite was taken, and three times its mass of anhydrous ethanol was added, followed by 6% titanate ester by mass of magnesium-aluminum hydrotalcite. The mixture was stirred at 75℃ for 100 min, and then the stirring was stopped and the mixture was kept at the same temperature for 2 h until the anhydrous ethanol had completely evaporated. The mixture was then cooled to room temperature to obtain the modified magnesium-aluminum hydrotalcite.

[0033] Comparative Example 2

[0034] A functional material for concrete that can resist high-concentration compound salt erosion comprises the following components in parts by weight: 200 parts of molybdenum tailings powder, 15 parts of calcium lignosulfonate, 20 parts of antisulfuric acid erosion agent, 30 parts of antichloride erosion agent, 3 parts of sodium methylparaben, and 8 parts of sodium dodecylbenzene sulfonate; wherein the antisulfuric acid erosion agent is a mixture of modified red mud and modified magnesium aluminum hydrotalcite in a mass ratio of 2:1; and the antichloride erosion agent is a mixture of magnesium oxide and cenospheres in a mass ratio of 1:1.

[0035] The modified red mud is prepared by the following method: take red mud and crush it to 500 mesh, add water in equal parts by weight, adjust the pH to 8.5, add 3-aminopropyltriethoxysilane accounting for 15% of the red mud mass, stir and react for 2 hours, calcine at 200℃ for 2 hours, and cool to room temperature to obtain modified red mud.

[0036] The modified magnesium-aluminum hydrotalcite was prepared by the following method: the magnesium-aluminum hydrotalcite was calcined at 600℃ for 45 min to obtain calcined magnesium-aluminum hydrotalcite, which was then pulverized to 500 mesh; the calcined magnesium-aluminum hydrotalcite was taken, and three times its mass of anhydrous ethanol was added, followed by 6% titanate ester by mass of magnesium-aluminum hydrotalcite. The mixture was stirred at 75℃ for 100 min, and then the stirring was stopped and the mixture was kept at the same temperature for 2 h until the anhydrous ethanol had completely evaporated. The mixture was then cooled to room temperature to obtain the modified magnesium-aluminum hydrotalcite.

[0037] Comparative Example 3

[0038] A functional material for concrete that can resist high-concentration compound salt erosion comprises the following components in parts by weight: 200 parts functional filler, 15 parts calcium lignosulfonate, 20 parts modified red mud, 30 parts chloride salt erosion resistant agent, 3 parts sodium methylparaben, and 8 parts sodium dodecylbenzenesulfonate; wherein the functional filler is a mixture of granulated blast furnace slag powder and molybdenum tailings powder in a mass ratio of 1:1; and the chloride salt erosion resistant agent is a mixture of magnesium oxide and cenospheres in a mass ratio of 1:1.

[0039] The modified red mud is prepared by the following method: take red mud and crush it to 500 mesh, add water in equal parts by weight, adjust the pH to 8.5, add 3-aminopropyltriethoxysilane accounting for 15% of the red mud mass, stir and react for 2 hours, calcine at 200℃ for 2 hours, and cool to room temperature to obtain modified red mud.

[0040] Comparative Example 4

[0041] A functional material for concrete that can resist high-concentration composite salt erosion comprises the following components in parts by weight: 200 parts functional filler, 15 parts calcium lignosulfonate, 20 parts modified magnesium aluminum hydrotalcite, 30 parts chloride salt erosion resistant agent, 3 parts sodium paraben, and 8 parts sodium dodecylbenzene sulfonate; wherein the functional filler is a mixture of granulated blast furnace slag powder and molybdenum tailings powder in a mass ratio of 1:1; and the chloride salt erosion resistant agent is a mixture of magnesium oxide and cenospheres in a mass ratio of 1:1.

[0042] The modified magnesium-aluminum hydrotalcite was prepared by the following method: the magnesium-aluminum hydrotalcite was calcined at 600℃ for 45 min to obtain calcined magnesium-aluminum hydrotalcite, which was then pulverized to 500 mesh; the calcined magnesium-aluminum hydrotalcite was taken, and three times its mass of anhydrous ethanol was added, followed by 6% titanate ester by mass of magnesium-aluminum hydrotalcite. The mixture was stirred at 75℃ for 100 min, and then the stirring was stopped and the mixture was kept at the same temperature for 2 h until the anhydrous ethanol had completely evaporated. The mixture was then cooled to room temperature to obtain the modified magnesium-aluminum hydrotalcite.

[0043] Comparative Example 5

[0044] A functional material for concrete that can resist high-concentration compound salt erosion comprises the following components in parts by weight: 200 parts functional filler, 15 parts calcium lignosulfonate, 20 parts sulfate erosion resistant agent, 30 parts chloride erosion resistant agent, 3 parts sodium methylparaben, and 8 parts sodium dodecylbenzenesulfonate; wherein the functional filler is a mixture of granulated blast furnace slag powder and molybdenum tailings powder in a mass ratio of 1:1; the sulfate erosion resistant agent is a mixture of red mud and magnesium aluminum hydrotalcite in a mass ratio of 2:1; and the chloride erosion resistant agent is a mixture of magnesium oxide and cenospheres in a mass ratio of 1:1.

[0045] Comparative Example 6

[0046] A functional material for concrete that can resist high-concentration compound salt erosion comprises the following components in parts by weight: 200 parts functional filler, 15 parts calcium lignosulfonate, 20 parts anti-sulfate erosion agent, 30 parts magnesium oxide, 3 parts sodium methylparaben, and 8 parts sodium dodecylbenzenesulfonate; wherein the functional filler is a mixture of granulated blast furnace slag powder and molybdenum tailings powder mixed in a mass ratio of 1:1; and the anti-sulfate erosion agent is a mixture of modified red mud and modified magnesium aluminum hydrotalcite mixed in a mass ratio of 2:1.

[0047] The modified red mud is prepared by the following method: take red mud and crush it to 500 mesh, add water in equal parts by weight, adjust the pH to 8.5, add 3-aminopropyltriethoxysilane accounting for 15% of the red mud mass, stir and react for 2 hours, calcine at 200℃ for 2 hours, and cool to room temperature to obtain modified red mud.

[0048] The modified magnesium-aluminum hydrotalcite was prepared by the following method: the magnesium-aluminum hydrotalcite was calcined at 600℃ for 45 min to obtain calcined magnesium-aluminum hydrotalcite, which was then pulverized to 500 mesh; the calcined magnesium-aluminum hydrotalcite was taken, and three times its mass of anhydrous ethanol was added, followed by 6% titanate ester by mass of magnesium-aluminum hydrotalcite. The mixture was stirred at 75℃ for 100 min, and then the stirring was stopped and the mixture was kept at the same temperature for 2 h until the anhydrous ethanol had completely evaporated. The mixture was then cooled to room temperature to obtain the modified magnesium-aluminum hydrotalcite.

[0049] Comparative Example 7

[0050] A functional material for concrete that can resist high-concentration compound salt erosion comprises the following components in parts by weight: 200 parts functional filler, 15 parts calcium lignosulfonate, 20 parts anti-sulfate erosion agent, 30 parts cenospheres, 3 parts sodium methylparaben, and 8 parts sodium dodecylbenzenesulfonate; wherein the functional filler is a mixture of granulated blast furnace slag powder and molybdenum tailings powder mixed in a mass ratio of 1:1; and the anti-sulfate erosion agent is a mixture of modified red mud and modified magnesium aluminum hydrotalcite mixed in a mass ratio of 2:1.

[0051] The modified red mud is prepared by the following method: take red mud and crush it to 500 mesh, add water in equal parts by weight, adjust the pH to 8.5, add 3-aminopropyltriethoxysilane accounting for 15% of the red mud mass, stir and react for 2 hours, calcine at 200℃ for 2 hours, and cool to room temperature to obtain modified red mud.

[0052] The modified magnesium-aluminum hydrotalcite was prepared by the following method: the magnesium-aluminum hydrotalcite was calcined at 600℃ for 45 min to obtain calcined magnesium-aluminum hydrotalcite, which was then pulverized to 500 mesh; the calcined magnesium-aluminum hydrotalcite was taken, and three times its mass of anhydrous ethanol was added, followed by 6% titanate ester by mass of magnesium-aluminum hydrotalcite. The mixture was stirred at 75℃ for 100 min, and then the stirring was stopped and the mixture was kept at the same temperature for 2 h until the anhydrous ethanol had completely evaporated. The mixture was then cooled to room temperature to obtain the modified magnesium-aluminum hydrotalcite.

[0053] Experimental example:

[0054] Concrete specimen preparation: Ordinary Portland cement and water were taken according to a water-cement ratio of 0.32. Fly ash (20% of the mass of ordinary Portland cement) and functional materials (8% prepared in Examples 1-3 and Comparative Examples 1-7) were added, stirred evenly, and molded. The specimens were then cured for 28 days at an ambient temperature of 20±2℃ and a humidity greater than 95%.

[0055] The compressive strength of concrete prepared using the functional materials of Examples 1-3 and Comparative Examples 1-2 was determined. Each experiment was conducted three times, and the average value was taken. The experimental results were statistically analyzed using SPSS 24.0 software. Quantitative data were analyzed using... (mean ± standard deviation) represents the mean. The Kolmogorov-Smirnov test was used to test the normality of the data. For normally distributed data, the t-test was used to compare the differences in means between two groups. A p-value < 0.05 was considered statistically significant. The performance test results are shown in Table 1.

[0056] Table 1

[0057] Experimental group Compressive strength MPa Example 1 58.8±1.1 Example 2 59.1±1.2 Example 3 57.3±2.5 Comparative Example 1 49.9±1.2* Comparative Example 2 48.8±2.1*

[0058] Note: * indicates p<0.05 compared to Example 1.

[0059] Concrete performance was tested according to the "Standard for Test Methods of Long-Term Performance and Durability of Concrete" (GB / T 50082-2024) (concrete prepared using functional materials from Examples 1-3 and Comparative Examples 3-5). 150 wet-dry cycles were performed, with three measurements taken for each group and the average value recorded. Statistical analysis was performed using SPSS 24.0 software. Measurement data were analyzed using... The Kolmogorov-Smirnov test was used to test the normality of the data. For normally distributed data, the t-test was used to compare the differences in means between the two groups, with P < 0.05 considered statistically significant. The performance test results are shown in Table 2.

[0060] Table 2

[0061]

[0062]

[0063] Note: * indicates p<0.05 compared to Example 1.

[0064] According to the RCM method for chloride ion penetration resistance testing in GB / T 50082-2024, electromigration experiments and chloride ion penetration depth tests were conducted according to the standard. The unsteady-state chloride ion migration coefficient and the total electrical flux passing through the concrete specimens after 6 hours of testing were calculated for concrete (concrete prepared using the functional materials of Examples 1-3 and Comparative Examples 6-7). Each group of experiments was measured three times and the average value was taken. The experimental results were statistically analyzed using SPSS 24.0 software. Quantitative data were analyzed using... The Kolmogorov-Smirnov test was used to test the normality of the data. For normally distributed data, the t-test was used to compare the differences in means between the two groups, with P < 0.05 considered statistically significant. The performance test results are shown in Table 3.

[0065] Table 3

[0066]

[0067] Note: * indicates p<0.05 compared to Example 1.

[0068] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A functional material for concrete that can resist the erosion of high concentrations of composite salts, characterized in that, The composition comprises the following components in parts by weight: 150-300 parts functional filler, 10-20 parts water-reducing agent, 15-30 parts sulfate-resistant agent, 20-40 parts chloride-resistant agent, 2-5 parts corrosion inhibitor, and 5-10 parts air-entraining agent; the functional filler is one or more of the following: limonite powder, wollastonite powder, sepiolite powder, granulated blast furnace slag powder, molybdenum tailings powder, iron tailings powder, and bentonite tailings powder; the sulfate-resistant agent is a modified... The modified red mud and modified magnesium aluminum hydrotalcite are mixed at a mass ratio of 2:

1. The modified red mud is prepared by the following method: take red mud and crush it to 300-600 mesh, add 0.5-2 times the weight of water, adjust the pH to 8-9, add 10-20% of the red mud mass of 3-aminopropyltriethoxysilane, stir and react for 1-3 hours, calcine at 150-250℃ for 1-3 hours, and cool to room temperature to obtain modified red mud. The modified magnesium-aluminum hydrotalcite is prepared by the following method: calcining the magnesium-aluminum hydrotalcite at 500-700℃ for 30-60 min to obtain calcined magnesium-aluminum hydrotalcite, and then pulverizing it to 300-600 mesh; taking the calcined magnesium-aluminum hydrotalcite, adding 2-4 times its mass of anhydrous ethanol, and then adding 3-8% of titanate ester by mass of magnesium-aluminum hydrotalcite, stirring at a constant temperature of 60-85℃ for 80-120 min, stopping stirring and keeping warm for 1-3 h until the anhydrous ethanol has completely evaporated, and then cooling to room temperature to obtain modified magnesium-aluminum hydrotalcite; the anti-chloride salt corrosion agent is a mixture of magnesium oxide and cenospheres at a mass ratio of 1:

1.

2. The functional concrete material resistant to high-concentration composite salt erosion according to claim 1, characterized in that, The functional filler is a mixture of granulated blast furnace slag powder and molybdenum tailings powder mixed in a mass ratio of 1:

1.

3. The functional concrete material resistant to high-concentration composite salt erosion according to claim 1 or 2, characterized in that, The water-reducing agent is one or more of the following: calcium lignosulfonate, sodium lignosulfonate, lignosulfonate propanesulfonate, TH-928 water-reducing agent, and ASP aminosulfonate high-efficiency water-reducing agent.

4. The functional concrete material resistant to high-concentration composite salt erosion according to claim 3, characterized in that, The preservative is one or more of sodium methylparaben, sodium ethylparaben, boric acid, parabens, and sodium diacetate; the air-entraining agent is one or more of rosin soap, sodium dodecylbenzene sulfonate, sodium fatty alcohol polyoxyethylene ether sulfonate, and ZY-99.

5. The application of the functional material for concrete that can resist high concentration of compound salt erosion as described in claim 1 in the preparation of concrete.

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