Ultra high performance seawater sea sand concrete

Abstract

The present application relates to ultra-high performance seawater sea sand concrete, belongs to concrete technical field;Seawater sea sand concrete technology can effectively solve the problem of lack of building materials in the open sea engineering, reduce the engineering cost, shorten the construction period, but the seawater is rich in a large number of chloride ions and sulfate ions will accelerate the corrosion rate of stainless steel fiber network in concrete, the present application prepares a kind of amphiphilic corrosion inhibitor with hydrophilic sulfonic acid group and hydrophobic trifluoromethyl in structure, this amphiphilic structure can make corrosion inhibitor have better dispersion effect in concrete, and when amphiphilic corrosion inhibitor disperses in concrete, the trifluoromethyl in it will tend to be far away from water environment, thereby driving amphiphilic corrosion inhibitor to the solid-liquid interface of the surface of stainless steel fiber enrichment, effectively improve the adhesion efficiency of corrosion inhibitor on the surface of stainless steel fiber.

Description

Technical Field

[0001] This invention belongs to the field of concrete technology, specifically relating to ultra-high performance seawater sand concrete. Background Technology

[0002] In marine environments far from land, the supply costs of traditional concrete building materials—freshwater and river sand—are extremely high, and the over-exploitation of river sand has already caused serious damage to the ecological environment. Therefore, how to utilize locally sourced seawater and sea sand to prepare concrete has become a research hotspot and urgent need in the field of concrete.

[0003] Seawater and sea sand concrete refers to concrete prepared directly using undesalinated seawater and undesalinated sea sand as mixing water and fine aggregate. This technology can effectively solve the bottleneck problem of material scarcity in offshore engineering projects, significantly reduce project costs, shorten construction cycles, and has significant economic benefits and strategic significance. The main problem with seawater and sea sand concrete is that the high chloride and sulfate ions in seawater accelerate the corrosion rate of the stainless steel fiber network in the concrete, leading to cracking and spalling of the concrete protective layer and severely shortening the service life of the structure. To solve the corrosion problem caused by seawater, existing technologies usually add corrosion inhibitors to the concrete. However, inorganic corrosion inhibitors such as nitrites are toxic and may adversely affect the long-term durability of concrete. While organic corrosion inhibitors are more environmentally friendly, most organic corrosion inhibitors have poor dispersibility in the complex concrete slurry environment and easily compete with water-reducing agents for adsorption, resulting in uneven distribution in the concrete. This makes it difficult for them to efficiently migrate to the surface of steel bars or fibers and form a continuous, dense protective film, greatly limiting their corrosion inhibition performance.

[0004] Based on the above background, the present invention provides an ultra-high performance seawater sand concrete. Summary of the Invention

[0005] The purpose of this invention is to provide ultra-high performance seawater sand concrete to solve the problems mentioned in the background art.

[0006] The objective of this invention can be achieved through the following technical solutions: Ultra-high performance seawater sand concrete contains the following raw materials: silicate cement, auxiliary gelling materials, sea sand, stainless steel fiber, polycarboxylate superplasticizer, amphiphilic corrosion inhibitor, and seawater; Furthermore, the mix proportion of the ultra-high performance seawater sand concrete is: silicate cement 562.14~1087.55kg / m³ 3 Auxiliary gel material: 118.04~567.93kg / m 3 Sea sand 899.42~966.71kg / m³ 3Stainless steel fiber: 78.5~235.5kg / m 3 Polycarboxylate superplasticizer 22.49~24.17kg / m 3 Amphiphilic corrosion inhibitor 0.4~0.6kg / m 3 Seawater 208~224kg / m 3 .

[0007] Furthermore, the auxiliary gel material is at least one of silica fume, fly ash, and metakaolin.

[0008] Furthermore, the sea sand has a particle size of less than 5 mm and a fineness modulus of 2.3 to 3.0.

[0009] Furthermore, the length of the stainless steel fiber is 10-15 cm.

[0010] Furthermore, the amphiphilic corrosion inhibitor can be prepared by the following steps: The first step involves reacting 4-methoxy-o-phenylenediamine with trifluoroacetic acid to synthesize benzimidazole, thereby obtaining a corrosion inhibitor. The reaction process is as follows: 4-methoxy-o-phenylenediamine and trifluoroacetic acid are mixed in a reaction vessel under nitrogen protection and reacted at 80-90℃ for 4-6 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the precipitate, the precipitate is washed with deionized water and dried to obtain the corrosion inhibitor.

[0011] The second step is to sulfonate the corrosion inhibitor with sulfuric acid to obtain an amphiphilic corrosion inhibitor.

[0012] The reaction process is as follows: sulfuric acid and corrosion inhibitor are mixed in a reaction vessel and reacted at 40-60℃ for 2-3 hours. After the reaction is completed, the reaction solution is poured into deionized water, extracted with ethyl acetate, and the organic phase is separated. The organic phase is then removed by rotary evaporation to remove the solvent. The remaining solid is recrystallized with anhydrous ethanol to obtain the amphiphilic corrosion inhibitor.

[0013] Furthermore, the sulfuric acid is fuming sulfuric acid, and the concentration of sulfur trioxide in the fuming sulfuric acid is 20%.

[0014] Furthermore, the mass ratio of 4-methoxy-o-phenylenediamine to trifluoroacetic acid used is 1.4–2.8: 4.2–11.2.

[0015] Furthermore, the mass ratio of sulfuric acid to corrosion inhibitor used is 4.8–12.8:1.6–3.2.

[0016] In summary, the present invention has at least the following beneficial effects: This invention prepares an amphiphilic corrosion inhibitor with both hydrophilic sulfonic acid groups and hydrophobic trifluoromethyl groups in its structure. This amphiphilic structure enables the corrosion inhibitor to have a better dispersion effect in concrete. When the amphiphilic corrosion inhibitor is dispersed in concrete, the trifluoromethyl groups tend to move away from the water environment, thereby driving the amphiphilic corrosion inhibitor to accumulate at the solid-liquid interface on the surface of stainless steel fibers, effectively improving the adhesion efficiency of the corrosion inhibitor on the surface of stainless steel fibers.

[0017] After adsorbing polycarboxylate superplasticizer, cement particles will carry a negative charge. The amphiphilic corrosion inhibitor prepared in this invention can form a stable negatively charged layer on the surface of stainless steel fibers after adhering to the surface of stainless steel fibers. This generates electrostatic repulsion on the cement particles, thereby preventing the disordered accumulation of cement particles near the stainless steel fibers and promoting the orderly arrangement of cement particles near the stainless steel fibers. This significantly enhances the compactness of the stainless steel fiber interface area and greatly improves the compressive strength and flexural strength of seawater sand concrete. Detailed Implementation

[0018] This invention provides ultra-high performance seawater sand concrete. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve its implementation. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and fall within the scope of protection of this invention. The methods and applications of this invention have been described through preferred embodiments. Those skilled in the art can clearly modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

[0019] It should be understood that the expression “one or more of…” individually includes each of the objects described after the expression, as well as various different combinations of two or more of the described objects, unless otherwise understood from the context and usage. The expression “and / or” combined with three or more described objects should be understood to have the same meaning, unless otherwise understood from the context.

[0020] The terms “including,” “having,” or “containing,” including the use of their grammatical synonyms, should generally be understood as open-ended and non-restrictive, for example, not excluding other unstated elements or steps, unless otherwise specifically stated or understood from the context.

[0021] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural.

[0022] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items.

[0023] It should be understood that the order of the steps or the order in which certain actions are performed is not important as long as the invention remains operational. Furthermore, two or more steps or actions can be performed simultaneously.

[0024] The use of any and all instances or exemplary language such as “e.g.” or “including” in this document is merely intended to better illustrate the invention and is not intended to limit the scope of the invention unless the claims are made. No language in this specification should be construed as indicating that any unclaimed element is essential to the practice of the invention.

[0025] Furthermore, the numerical ranges and parameters used to define the present invention are approximate values, and the relevant values ​​in the specific embodiments have been presented as precisely as possible. However, any value inevitably contains standard deviations due to individual test methods. Therefore, unless explicitly stated otherwise, it should be understood that all ranges, quantities, values, and percentages used in this disclosure are modified with the word "approximately". Here, "approximately" generally means that the actual value is within plus or minus 10%, 5%, 1%, or 0.5% of a specific value or range.

[0026] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0027] The embodiments and comparative examples of this invention describe some examples, in which the embodiments illustrate certain implementations of the invention. However, this does not mean that the effects of the invention can only be achieved in these examples.

[0028] The silicate cement used in the following examples is PO 52.5R silicate cement. The concentration of chloride ions in the seawater used is 19.8 g / L, sodium ions is 11.0 g / L, sulfate ions is 2.7 g / L, magnesium ions is 1.2 g / L, calcium ions is 0.35 g / L, and potassium ions is 0.4 g / L. To further illustrate the present invention, the following examples provide a detailed description of the ultra-high performance seawater sand concrete provided by the present invention. Example 1

[0029] The mix proportions of ultra-high performance seawater sand concrete are as follows: silicate cement 1087.55 kg / m³ 3Silica fume 120.84 kg / m³ 3 Sea sand 966.71 kg / m 3 Stainless steel fiber 78.5kg / m 3 Polycarboxylate superplasticizer 24.17 kg / m 3 Amphiphilic corrosion inhibitor 0.4 kg / m 3 Seawater 224kg / m 3 .

[0030] The amphiphilic corrosion inhibitor is prepared by the following steps: Step 1: According to the mass fraction, 1.4 parts of 4-methoxy-o-phenylenediamine and 4.2 parts of trifluoroacetic acid are mixed in a reaction vessel under nitrogen protection. The mixture is reacted at 80°C for 6 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering and separating the precipitate, the precipitate is washed with deionized water and dried to obtain the corrosion inhibitor.

[0031] Step 2: By mass fraction, 4.8 parts of fuming sulfuric acid with a sulfur trioxide concentration of 20% and 1.6 parts of corrosion inhibitor are mixed in a reaction vessel and reacted at 40°C for 3 hours. After the reaction is completed, the reaction solution is poured into deionized water, extracted with ethyl acetate, and the organic phase is separated. The solvent is removed by rotary evaporation of the organic phase. The remaining solid is recrystallized from anhydrous ethanol to obtain the amphiphilic corrosion inhibitor.

[0032] In this embodiment, the sea sand used has a particle size of less than 5 mm and a fineness modulus of 2.3, and the stainless steel fiber used has a length of 10 cm. Example 2

[0033] The mix proportions of ultra-high performance seawater sand concrete are as follows: silicate cement 697.27 kg / m³ 3 Silica fume 116.21 kg / m³ 3 fly ash 174.32 kg / m³ 3 metakaolin 174.32 kg / m 3 Sea sand 929.69 kg / m 3 Stainless steel fiber 78.5kg / m 3 Polycarboxylate superplasticizer 23.24 kg / m 3 Amphiphilic corrosion inhibitor 0.4 kg / m 3 Seawater 216kg / m 3 .

[0034] The amphiphilic corrosion inhibitor is prepared by the following steps: Step 1: According to the mass fraction, 1.4 parts of 4-methoxy-o-phenylenediamine and 4.2 parts of trifluoroacetic acid are mixed in a reaction vessel under nitrogen protection. The mixture is reacted at 80°C for 6 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering and separating the precipitate, the precipitate is washed with deionized water and dried to obtain the corrosion inhibitor.

[0035] Step 2: By mass fraction, 4.8 parts of fuming sulfuric acid with a sulfur trioxide concentration of 20% and 1.6 parts of corrosion inhibitor are mixed in a reaction vessel and reacted at 40°C for 3 hours. After the reaction is completed, the reaction solution is poured into deionized water, extracted with ethyl acetate, and the organic phase is separated. The solvent is removed by rotary evaporation of the organic phase. The remaining solid is recrystallized from anhydrous ethanol to obtain the amphiphilic corrosion inhibitor.

[0036] In this embodiment, the sea sand used has a particle size of less than 5 mm and a fineness modulus of 2.7, and the stainless steel fiber used has a length of 11 cm. Example 3

[0037] The mix proportions of ultra-high performance seawater sand concrete are as follows: silicate cement 690.22 kg / m³ 3 Silica fume 115.04 kg / m³ 3 fly ash 172.56 kg / m³ 3 metakaolin 172.56 kg / m 3 920.30 kg / m³ of sea sand 3 157kg / m² stainless steel fiber 3 Polycarboxylate superplasticizer 23.01 kg / m 3 Amphiphilic corrosion inhibitor 0.5 kg / m 3 Seawater 213kg / m 3 .

[0038] The amphiphilic corrosion inhibitor is prepared by the following steps: Step 1: According to the mass fraction, 2.1 parts of 4-methoxy-o-phenylenediamine and 7.7 parts of trifluoroacetic acid are mixed in a reaction vessel under nitrogen protection. The mixture is reacted at 85°C for 5 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the precipitate, the precipitate is washed with deionized water and dried to obtain the corrosion inhibitor.

[0039] The second step involves mixing 8.8 parts by mass of fuming sulfuric acid with a sulfur trioxide concentration of 20% and 2.4 parts by mass of corrosion inhibitor in a reaction vessel. The mixture is then reacted at 50°C for 2.5 hours. After the reaction is complete, the reaction solution is poured into deionized water, extracted with ethyl acetate, and the organic phase is separated. The solvent is removed by rotary evaporation of the organic phase. The remaining solid is recrystallized from anhydrous ethanol to obtain the amphiphilic corrosion inhibitor.

[0040] In this embodiment, the sea sand used has a particle size of less than 5 mm and a fineness modulus of 2.5, and the stainless steel fiber used has a length of 12 cm. Example 4

[0041] The mix proportions of ultra-high performance seawater sand concrete are as follows: silicate cement 567.94 kg / m³ 3 Silica fume 113.59 kg / m³ 3 227.17 kg / m³ of fly ash 3 Metakaolin 227.17 kg / m 3 Sea sand 908.70 kg / m 3 157kg / m² stainless steel fiber 3 Polycarboxylate superplasticizer 22.72 kg / m 3 Amphiphilic corrosion inhibitor 0.5 kg / m 3 Seawater 211kg / m 3 .

[0042] The amphiphilic corrosion inhibitor is prepared by the following steps: Step 1: According to the mass fraction, 2.1 parts of 4-methoxy-o-phenylenediamine and 7.7 parts of trifluoroacetic acid are mixed in a reaction vessel under nitrogen protection. The mixture is reacted at 85°C for 5 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the precipitate, the precipitate is washed with deionized water and dried to obtain the corrosion inhibitor.

[0043] The second step involves mixing 8.8 parts by mass of fuming sulfuric acid with a sulfur trioxide concentration of 20% and 2.4 parts by mass of corrosion inhibitor in a reaction vessel. The mixture is then reacted at 50°C for 2.5 hours. After the reaction is complete, the reaction solution is poured into deionized water, extracted with ethyl acetate, and the organic phase is separated. The solvent is removed by rotary evaporation of the organic phase. The remaining solid is recrystallized from anhydrous ethanol to obtain the amphiphilic corrosion inhibitor.

[0044] In this embodiment, the sea sand used has a particle size of less than 5 mm and a fineness modulus of 2.5, and the stainless steel fiber used has a length of 13 cm. Example 5

[0045] The mix proportions of ultra-high performance seawater sand concrete are as follows: silicate cement 683.18 kg / m³ 3 Silica fume 113.86 kg / m³ 3 170.79 kg / m³ of fly ash 3 metakaolin 170.79 kg / m 3 Sea sand 910.91kg / m 3 Stainless steel fiber 235.5kg / m 3 Polycarboxylate superplasticizer 22.77 kg / m 3Amphiphilic corrosion inhibitor 0.6 kg / m 3 Seawater 211kg / m 3 .

[0046] The amphiphilic corrosion inhibitor is prepared by the following steps: Step 1: According to the mass fraction, 2.8 parts of 4-methoxy-o-phenylenediamine and 11.2 parts of trifluoroacetic acid are mixed in a reaction vessel under nitrogen protection. The mixture is reacted at 90°C for 4 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering and separating the precipitate, the precipitate is washed with deionized water and dried to obtain the corrosion inhibitor.

[0047] Step 2: By mass fraction, 12.8 parts of fuming sulfuric acid with a sulfur trioxide concentration of 20% and 3.2 parts of corrosion inhibitor were mixed in a reaction vessel and reacted at 60°C for 2 hours. After the reaction was completed, the reaction solution was poured into deionized water, extracted with ethyl acetate, and the organic phase was separated. The solvent was removed by rotary evaporation of the organic phase. The remaining solid was recrystallized from anhydrous ethanol to obtain the amphiphilic corrosion inhibitor.

[0048] In this embodiment, the sea sand used has a particle size of less than 5 mm and a fineness modulus of 3.0, and the stainless steel fiber used has a length of 14 cm. Example 6

[0049] The mix proportions of ultra-high performance seawater sand concrete are as follows: silicate cement 562.14 kg / m³ 3 Silica fume 112.43 kg / m³ 3 224.86 kg / m³ of fly ash 3 Metakaolin 224.86 kg / m 3 Sea sand 899.42 kg / m 3 Stainless steel fiber 235.5kg / m 3 Polycarboxylate superplasticizer 22.49 kg / m 3 Amphiphilic corrosion inhibitor 0.6 kg / m 3 Seawater 208kg / m 3 .

[0050] The amphiphilic corrosion inhibitor is prepared by the following steps: Step 1: According to the mass fraction, 2.8 parts of 4-methoxy-o-phenylenediamine and 11.2 parts of trifluoroacetic acid are mixed in a reaction vessel under nitrogen protection. The mixture is reacted at 90°C for 4 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering and separating the precipitate, the precipitate is washed with deionized water and dried to obtain the corrosion inhibitor.

[0051] Step 2: By mass fraction, 12.8 parts of fuming sulfuric acid with a sulfur trioxide concentration of 20% and 3.2 parts of corrosion inhibitor were mixed in a reaction vessel and reacted at 60°C for 2 hours. After the reaction was completed, the reaction solution was poured into deionized water, extracted with ethyl acetate, and the organic phase was separated. The solvent was removed by rotary evaporation of the organic phase. The remaining solid was recrystallized from anhydrous ethanol to obtain the amphiphilic corrosion inhibitor.

[0052] In this embodiment, the sea sand used has a particle size of less than 5 mm and a fineness modulus of 2.5, and the stainless steel fiber used has a length of 15 cm.

[0053] Comparative Example 1 The difference between this comparative example and Example 4 is that no additional amphiphilic corrosion inhibitor is prepared; instead, an equal mass of steel corrosion inhibitor benzimidazole is used.

[0054] The mix proportions of ultra-high performance seawater sand concrete are as follows: silicate cement 567.94 kg / m³ 3 Silica fume 113.59 kg / m³ 3 227.17 kg / m³ of fly ash 3 Metakaolin 227.17 kg / m 3 Sea sand 908.70 kg / m 3 157kg / m² stainless steel fiber 3 Polycarboxylate superplasticizer 22.72 kg / m 3 Benzimidazole 0.5 kg / m 3 Seawater 211kg / m 3 .

[0055] In this comparative example, the sea sand used had a particle size of less than 5 mm and a fineness modulus of 2.5, and the stainless steel fiber used had a length of 13 cm.

[0056] Experimental Example 1 The ultra-high performance seawater sand concrete samples from Examples 1-6 and Comparative Example 1 were prepared as follows: Silicate cement and auxiliary gelling materials were added to a mixer and dry-mixed for 2 minutes. Sea sand was then added to the mixer and dry-mixed for another 3 minutes. Next, amphiphilic corrosion inhibitor, water-reducing agent, and seawater were mixed evenly and added to the mixer in two equal batches. After adding the first batch, the mixture was stirred for 2.5 minutes before adding the second batch, and stirring was continued for another 2.5 minutes. Then, stainless steel fibers were added to the mixer in two equal batches. After adding the first batch, the mixture was stirred for 2.5 minutes before adding the second batch, and stirring was continued for another 2.5 minutes. Finally, the concrete was poured into molds, vibrated to compact it, and cured for 28 days under the following conditions: temperature 20±2℃, relative humidity greater than 95%. The compressive strength and flexural strength of each component of the concrete sample were then tested according to the national standard GB / T 50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete". The chloride ion diffusion coefficient of each component of concrete samples was tested according to standard 50082-2024, "Standard Test Methods for Long-Term Performance and Durability of Concrete". The test results are shown in Table 1. Table 1 project Compressive strength / MPa Flexural strength / MPa <![CDATA[Chloride ion diffusion coefficient / × 10 ﹣12 m 2 / s]]> Example 1 111.8 15.9 2.87 Example 2 108.1 15.8 2.71 Example 3 114.7 16.3 2.38 Example 4 102.8 14.9 2.46 Example 5 112.1 16.1 2.44 Example 6 106.4 15.3 2.52 Comparative Example 1 98.4 13.6 4.72 As can be seen from Table 1, the amphiphilic corrosion inhibitor of the present invention has a better chlorine corrosion inhibition effect than conventional single-polar corrosion inhibitors, and the concrete samples with the addition of the amphiphilic corrosion inhibitor of the present invention have better compressive strength and flexural strength after curing.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. Ultra-high performance seawater sand concrete, characterized in that, It contains the following raw materials: silicate cement, auxiliary gelling materials, sea sand, stainless steel fiber, polycarboxylate superplasticizer, amphiphilic corrosion inhibitor, and seawater; The amphiphilic corrosion inhibitor is prepared by the following steps: The first step involves reacting 4-methoxy-o-phenylenediamine with trifluoroacetic acid to synthesize benzimidazole, thereby obtaining a corrosion inhibitor. The second step is to sulfonate the corrosion inhibitor with sulfuric acid to obtain an amphiphilic corrosion inhibitor.

2. The ultra-high performance seawater sand concrete according to claim 1, characterized in that, The mix proportion of the ultra-high performance seawater sand concrete is: silicate cement 562.14~1087.55kg / m³ 3 Auxiliary gel material: 118.04~567.93kg / m 3 Sea sand 899.42~966.71kg / m³ 3 Stainless steel fiber: 78.5~235.5kg / m 3 Polycarboxylate superplasticizer 22.49~24.17kg / m 3 Amphiphilic corrosion inhibitor 0.4~0.6kg / m 3 Seawater 208~224kg / m 3 .

3. The ultra-high performance seawater sand concrete according to claim 1, characterized in that, The auxiliary gel material is at least one of silica fume, fly ash, and metakaolin.

4. The ultra-high performance seawater sand concrete according to claim 1, characterized in that, The sea sand has a particle size of less than 5 mm and a fineness modulus of 2.3 to 3.

0.

5. The ultra-high performance seawater sand concrete according to claim 1, characterized in that, The stainless steel fiber has a length of 10-15 cm.

6. The ultra-high performance seawater sand concrete according to claim 1, characterized in that, The sulfuric acid is fuming sulfuric acid, and the concentration of sulfur trioxide in the fuming sulfuric acid is 20%.

7. The ultra-high performance seawater sand concrete according to claim 1, characterized in that, The mass ratio of 4-methoxy-o-phenylenediamine to trifluoroacetic acid used is 1.4–2.8:4.2–11.

2.

8. The ultra-high performance seawater sand concrete according to claim 1, characterized in that, The mass ratio of sulfuric acid to corrosion inhibitor used is 4.8–12.8:1.6–3.

2.

9. The ultra-high performance seawater sand concrete according to claim 1, characterized in that, The conditions for the synthesis of benzimidazole are: Under nitrogen protection, 4-methoxy-o-phenylenediamine and trifluoroacetic acid are mixed in a reaction vessel and reacted at a temperature of 80–90 °C to obtain a corrosion inhibitor.

10. The ultra-high performance seawater sand concrete according to claim 1, characterized in that, The sulfonation conditions are as follows: Sulfuric acid and corrosion inhibitor are mixed in a reaction vessel and reacted at a temperature of 40–60°C to obtain an amphiphilic corrosion inhibitor.