A concrete rust-preventing type internal curing agent, a preparation method and application thereof

Abstract

The application discloses a concrete rust-preventing type internal curing agent and a preparation method and application thereof, and belongs to the technical field of concrete admixtures. The preparation method comprises the following steps: S1. loading components and water in a container, ultrasonic homogenization, stirring at 30-45 DEG C after adding healing components, and obtaining a primary product A; S2. adding a superabsorbent polymer in the primary product A, uniformly dispersing, adding inorganic rust-preventing components, heating to 45-55 DEG C, uniformly stirring in a protective gas atmosphere, and obtaining a middle product B; S3. adding organic rust-preventing components in the middle product B, uniformly stirring in a protective gas atmosphere at 45-55 DEG C, then heating to 55-65 DEG C, continuously stirring, and obtaining the internal curing agent after dehydration and drying. The internal curing agent prepared by the preparation method has self-curing, self-healing and rust-preventing functions, and has a long-term slow-release effect; can effectively resist cracks generated in the service process of concrete, plays a self-healing function, prevents corrosion ion erosion, and improves the durability of the concrete.

Description

Technical Field

[0001] This invention belongs to the field of concrete admixture technology, specifically relating to a concrete rust-inhibiting internal curing agent, its preparation method, and its application. Background Technology

[0002] Concrete is a comprehensive technology combining particle packing and cementitious chemistry. During concrete construction, internal hydration reactions intensify, rapidly consuming free water, requiring continuous hydration with free water in the middle and later stages. The density and integrity of concrete itself are the main factors affecting its service life; cracking, spalling, carbonation, corrosion, and other defects will also shorten its service life. This applies to marine engineering and inland saline-alkali areas. - SO4 2- Harmful substances, such as carbonation and microcracks in concrete, can diffuse into the concrete matrix more quickly with the help of water, which will accelerate the expansion of concrete defects, reduce concrete performance, and increase repair and reinforcement costs.

[0003] The main technical means to improve the durability of concrete are as follows: ① Adding mineral admixtures to reduce the peak hydration of concrete and alleviate the demand for internal free water; ② Adding calcium and magnesium oxide expansion agents to reduce the occurrence of non-structural cracks in concrete by supplementing shrinkage; ③ Using sulfate-resistant cement; ④ Adding admixtures (such as corrosion inhibitors, waterproofing agents, and heat of hydration inhibitors) to concrete. Among these, adding admixtures to concrete is the most common. For example, Chinese patent CN109928656A discloses a heat of hydration inhibitory concrete corrosion inhibitor, its preparation method, and its application. The corrosion inhibitor is made from the following raw materials in the following mass percentages: 1%–3% heat of hydration inhibitor, 0.5%–1% ammonium heptamolybdate, 0.2%–1% sodium hexametaphosphate, and 95%–99% gypsum. The corrosion inhibitor can be added to concrete to resist the corrosion of concrete by sulfates and chloride ions, significantly reduce the early hydration rate and heat of hydration of cement, and reduce early temperature shrinkage cracks; it can be widely used in large-volume concrete structures in sulfate and chloride erosion environments. However, this corrosion inhibitor lacks a slow-release and long-term effect. For reinforced concrete, its ability to continuously and persistently exert its rust-inhibiting effect is more important. For example, Chinese patent CN116283018A discloses a concrete waterproofing agent and its preparation method. The raw materials and weight parts of the waterproofing agent are as follows: 20-60 parts calcium oxide, 15-30 parts potassium aluminum sulfate, 5-25 parts magnesium oxide, 5-15 parts superabsorbent resin, 10-20 parts hydrophobic component, 40-60 parts hydrophobic micro-fine silica aerogel powder, 10-15 parts sodium silicate, 8-16 parts disodium ethylenediaminetetraacetate, 8-16 parts glycine, 6-15 parts lithium magnesium silicate, 150-200 parts fly ash, 20-60 parts silica fume, and 1-3 parts water-reducing agent. The waterproofing agent has excellent anti-seepage and waterproofing effects, can improve the strength and stability of concrete, and can be widely used in anti-seepage and waterproofing construction of concrete in subways, ports, dams, tunnels, basements, etc. However, the active substances in this waterproofing agent form CSH gel in the early stages of concrete hydration, which has no effect on cracks that occur during the service life of concrete. The patent also does not take into account the anti-corrosion and rust-inhibiting effects of reinforced concrete.

[0004] Therefore, it is of great significance to provide an internal curing agent with self-curing, self-healing and anti-corrosion and rust-inhibiting functions that can repair cracks that occur in concrete during its service life. Summary of the Invention

[0005] To address the shortcomings of the existing technology, one objective of this invention is to provide a method for preparing a concrete rust-inhibiting internal curing agent. The prepared internal curing agent possesses self-curing, self-healing, and rust-inhibiting functions, and exhibits a long-term slow-release effect. It can effectively resist and repair cracks that occur during concrete service, exert its self-healing function, prevent the erosion of corrosive ions, and improve the durability of concrete.

[0006] To achieve the above objectives, the specific technical solution of the present invention is as follows:

[0007] A method for preparing a concrete rust-inhibiting internal curing agent includes the following steps:

[0008] S1. Add the loading component and water to the container, homogenize by ultrasonication, add the healing component and stir at 30-45°C to obtain primary product A;

[0009] S2. Add superabsorbent resin to the primary product A obtained in step S1, disperse it evenly, add inorganic rust inhibitor, heat to 45-55℃, stir evenly under a protective gas atmosphere to obtain intermediate product B;

[0010] S3. Add an organic rust inhibitor to intermediate product B, stir evenly at 45-55°C under a protective gas atmosphere, then raise the temperature to 55-65°C and continue stirring under a protective gas atmosphere. After dehydration and drying, the internal curing agent is obtained.

[0011] In the preparation method of the present invention, the healing component is loaded onto the load component in step S1, the load component and the healing component are encapsulated with superabsorbent resin in step S2, and then the inorganic rust inhibitor is filled into the network structure of the superabsorbent resin in step S3 to encapsulate the superabsorbent resin with organic rust inhibitor to form a hybrid core-shell structure. After drying, the inner protective agent is obtained.

[0012] The mechanism of action of the internal maintenance agent prepared by this invention is as follows:

[0013] After pre-wetting, the internal curing agent is added to the concrete. The organic rust-inhibiting components in the outer layer of the internal curing agent react with the concrete first, exerting their rust-inhibiting effect. Through the water-retaining structure of the superabsorbent polymer (SAP), the internal curing agent begins to release free water in the middle and later stages of the hydration reaction, providing free water for the continuous hydration of the concrete and providing internal curing. During the release of free water, the inorganic rust-inhibiting components are slowly released along with the free water, continuously exerting their rust-inhibiting effect. In the middle and later stages of the slow-release process, the internal curing agent shrinks in volume, and the osmotic pressure between the internal curing agent and the concrete reaches equilibrium. During the service life of the concrete, when the concrete ages and develops microcracks, external water enters the concrete. The osmotic pressure of the concrete is greater than that of the internal curing agent. The SAP absorbs the water in the concrete, and at the same time, the water introduces calcium and magnesium ions. These calcium and magnesium ions react with the healing components in the internal curing agent to form CSH gel, which blocks the microcracks, prevents the entry of moisture and harmful ions, and exerts self-healing and secondary rust-inhibiting effects.

[0014] The internal curing agent of this invention is proposed by comprehensively considering the hydration mechanism of concrete and the service aging law of concrete structures. It has a hybrid core-shell structure. The outer organic rust-inhibiting component first exerts its rust-inhibiting effect. During the self-curing process in the middle and late stages of hydration, the inorganic rust-inhibiting component is slowly released with free water to inhibit rust in the concrete structure, achieving a long-term rust-inhibiting effect. During the service life of concrete, when cracks appear, external water enters the concrete, and the healing component inside the internal curing agent then takes effect, forming CSH gel to heal the cracks that have occurred during the service life of the concrete. The internal curing agent prepared by the method of this invention simultaneously possesses self-curing, self-healing, and long-term rust-inhibiting functions, which can effectively reduce non-structural cracking of concrete. When micro-cracks appear in concrete, it can form a gel to effectively seal the cracks and corrosive ions.

[0015] Preferably, the weight parts of each component are as follows: 11-17 parts of superabsorbent resin, 13-24 parts of inorganic rust inhibitor, 13-24 parts of organic rust inhibitor, 24-30 parts of healing component, and 20-26 parts of load component.

[0016] Preferably, the organic rust-inhibiting component includes at least one of N,N-dimethylethanolamine, polyacrylamide, triethanolamine, triisopropanolamine, benzotriazole, and imidazoline quaternary ammonium salts; the inorganic rust-inhibiting component includes at least one of sodium monofluorophosphate, sodium molybdate, sodium pentamethasone, sodium hexametaphosphate, ammonium heptamolybdate, and sodium tripolyphosphate.

[0017] Preferably, the organic rust-inhibiting component comprises triethanolamine and triisopropanolamine in a mass ratio of 3:1, and the inorganic rust-inhibiting component comprises sodium monofluorophosphate and sodium molybdate in a mass ratio of 3:2.

[0018] Preferably, the healing component includes at least one of sodium silicate, potassium silicate, and lithium silicate. More preferably, the mass ratio of sodium silicate, potassium silicate, and lithium silicate is 3:1:1.

[0019] Preferably, the loading component comprises nano-silica and / or fumed silica particles. More preferably, the loading component comprises nano-silica and fumed silica particles in a mass ratio of 7:13. The nano-silica and fumed silica serve to load the healing component; furthermore, the nano-silica and fumed silica can form crystalline clusters with the CSH gel formed by the healing component, thus densely filling the microcracks.

[0020] Another object of the present invention is to provide a concrete rust-inhibiting internal curing agent prepared by the preparation method described above.

[0021] Another object of the present invention is to provide the application of the aforementioned concrete rust-inhibiting internal curing agent in concrete, wherein the dosage of the concrete rust-inhibiting internal curing agent is 0.1% to 2% of the cementitious material.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] (1) The internal curing agent prepared by the method of this invention has a hybrid core-shell structure. The outer organic rust-inhibiting component first exerts its rust-inhibiting effect. During the later stages of hydration and self-curing, the inorganic rust-inhibiting component is slowly released with free water, inhibiting rust in the concrete structure and achieving a long-term rust-inhibiting effect. During the service life of the concrete, when cracks appear, external water enters the concrete, and the healing component inside the internal curing agent then takes effect, forming CSH gel to heal the cracks that occur during the service life of the concrete. The internal curing agent prepared by the method of this invention simultaneously possesses self-curing, self-healing, and long-term rust-inhibiting functions, which can effectively reduce non-structural cracking of concrete. When micro-cracks appear in the concrete, it can form a gel to effectively seal the cracks and corrosive ions.

[0024] (2) Nano silica and fumed silica play the role of loading the healing components. In addition, nano silica and fumed silica can form crystalline clusters with the CSH gel formed by the healing components to densely fill the microcracks. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the internal maintenance agent prepared by the preparation method of the present invention;

[0026] Among them, 1. Fumed silica; 2. Nano silica; 3. Healing component; 4. Superabsorbent resin; 5. Inorganic rust inhibitor; 6. Organic rust inhibitor. Detailed Implementation

[0027] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The preparation method of the concrete rust-inhibiting internal curing agent of the present invention includes the following steps:

[0029] S1. Add the loading component and water to the container, homogenize by ultrasonication, add the healing component and stir at 30-45°C to obtain primary product A;

[0030] S2. Add superabsorbent resin to the primary product A obtained in step S1, disperse it evenly, add inorganic rust inhibitor, heat to 45-55℃, stir evenly under a protective gas atmosphere to obtain intermediate product B;

[0031] S3. Add an organic rust inhibitor to intermediate product B, stir evenly at 45-55°C under a protective gas atmosphere, then raise the temperature to 55-65°C and continue stirring under a protective gas atmosphere. After dehydration and drying, the internal curing agent is obtained.

[0032] The weight proportions of each component are as follows: 11-17 parts of superabsorbent resin, 13-24 parts of inorganic rust inhibitor, 13-24 parts of organic rust inhibitor, 24-30 parts of healing component, and 20-26 parts of load component.

[0033] As an optional embodiment, the organic rust-inhibiting component includes at least one of N,N-dimethylethanolamine, polyacrylamide, triethanolamine, triisopropanolamine, benzotriazole, and imidazoline quaternary ammonium salts; the inorganic rust-inhibiting component includes at least one of sodium monofluorophosphate, sodium molybdate, sodium pentamethasone, sodium hexametaphosphate, ammonium heptamolybdate, and sodium tripolyphosphate; the healing component includes at least one of sodium silicate, potassium silicate, and lithium silicate; and the loading component includes nano-silica and / or fumed silica particles.

[0034] Example 1

[0035] This embodiment provides a method for preparing a concrete rust-inhibiting internal curing agent, including the following steps:

[0036] S1. Add 23 parts of the load component to the container, add distilled water until the water covers the load component, then sonicate for 15 min, add 27 parts of the healing component, heat to 40℃ and stir for 25 min to obtain primary product A;

[0037] S2. Take 14 parts of polyacrylic acid resin and pre-wet it with distilled water. Then add the pre-wetted polyacrylic acid resin to the primary product A obtained in step S1, stir evenly, and then add 18 parts of inorganic rust inhibitor. Heat to 50°C and stir for 40 minutes under nitrogen gas to obtain intermediate product B.

[0038] S3. Add 18 parts of organic rust inhibitor to intermediate product B obtained in step S2, stir at 50°C under nitrogen for 40 min, then raise the temperature to 60°C and continue stirring under nitrogen for 75 min, and finally obtain the inner curing agent after dehydration and drying.

[0039] The loading component consists of nano-silica and fumed silica in a mass ratio of 7:13; the healing component consists of sodium silicate, potassium silicate and lithium silicate in a mass ratio of 3:1:1; the inorganic rust inhibitory component consists of sodium monofluorophosphate and sodium molybdate in a mass ratio of 3:2; and the organic rust inhibitory component consists of triethanolamine and triisopropanolamine in a mass ratio of 7:3.

[0040] like Figure 1 As shown, the internal curing agent prepared by the method of the present invention has a hybrid core-shell structure. The healing component 3 (sodium silicate, potassium silicate and lithium silicate) is loaded on the loading component (fumed silica 1 and nano silica 2), and then wrapped with a super absorbent resin 4. The pores of the super absorbent resin 4 are filled with inorganic rust inhibitor 5, and the outermost layer is wrapped with organic rust inhibitor 6, forming a hybrid core-shell structure.

[0041] Example 2

[0042] This embodiment provides a method for preparing a concrete rust-inhibiting internal curing agent, including the following steps:

[0043] S1. Add 26 parts of the load component to the container, add distilled water until the water covers the load component, then sonicate for 10 min, add 24 parts of the healing component, heat to 30℃ and stir for 45 min to obtain primary product A;

[0044] S2. Take 11 parts of polyacrylamide resin and pre-wet it with distilled water. Then add the pre-wetted polyacrylamide resin to the primary product A obtained in step S1, stir evenly, and then add 13 parts of inorganic rust inhibitor. Heat to 45°C and stir for 60 minutes under nitrogen gas to obtain intermediate product B.

[0045] S3. Add 24 parts of organic rust inhibitor to intermediate product B obtained in step S2, stir for 60 min at 45°C under nitrogen purging, then raise the temperature to 55°C and continue stirring for 75 min under nitrogen purging. Finally, after dehydration and drying, the inner curing agent is obtained.

[0046] The loading component consists of nano-silica and fumed silica in a mass ratio of 7:13; the healing component consists of sodium silicate, potassium silicate and lithium silicate in a mass ratio of 3:1:1; the inorganic rust inhibitory component consists of sodium metaphosphate, ammonium heptamolybdate and sodium tripolyphosphate in a mass ratio of 2:1:1; and the organic rust inhibitory component consists of triethanolamine and triisopropanolamine in a mass ratio of 7:3.

[0047] Example 3

[0048] This embodiment provides a method for preparing a concrete rust-inhibiting internal curing agent, including the following steps:

[0049] S1. Add 20 parts of the load component to the container, add distilled water until the water covers the load component, then sonicate for 20 min, add 30 parts of the healing component, heat to 45℃ and stir for 25 min to obtain primary product A;

[0050] S2. Take 17 parts of polyacrylic resin and pre-wet it with distilled water. Then add the pre-wetted polyacrylic resin to the primary product A obtained in step S1, stir evenly, and then add 24 parts of inorganic rust inhibitor. Heat to 55°C and stir for 40 minutes under nitrogen gas to obtain intermediate product B.

[0051] S3. Add 13 parts of organic rust inhibitor to intermediate product B obtained in step S2, stir at 55°C under nitrogen for 40 min, then raise the temperature to 65°C and continue stirring under nitrogen for 75 min, and finally obtain the inner curing agent after dehydration and drying.

[0052] The loading component consists of nano-silica and fumed silica in a mass ratio of 7:13; the healing component consists of sodium silicate, potassium silicate and lithium silicate in a mass ratio of 3:1:1; the inorganic rust inhibitor component consists of sodium monofluorophosphate and sodium molybdate in a mass ratio of 3:2; and the organic rust inhibitor component consists of N,N-dimethylethanolamine, polyacrylamide and benzotriazole in a mass ratio of 4:3:3.

[0053] Example 4

[0054] The preparation method of the concrete rust-inhibiting internal curing agent in this embodiment is basically the same as that in Example 1, except that the loading component is nano-silica.

[0055] Example 5

[0056] The preparation method of the concrete rust-inhibiting internal curing agent in this embodiment is basically the same as that in Example 1, except that the healing component is sodium silicate.

[0057] Comparative Example 1

[0058] This comparative example provides a method for preparing a concrete rust-inhibiting internal curing agent, comprising the following steps: adding 23 parts of a loading component, 27 parts of a healing component, 14 parts of polyacrylic acid resin, 18 parts of an inorganic rust-inhibiting component, 18 parts of an organic rust-inhibiting component, and 70 parts of distilled water to a container, stirring at room temperature for 75 minutes, and finally obtaining the internal curing agent after dehydration and drying.

[0059] The loading component consists of nano-silica and fumed silica in a mass ratio of 7:13; the healing component consists of sodium silicate, potassium silicate and lithium silicate in a mass ratio of 3:1:1; the inorganic rust inhibitory component consists of sodium monofluorophosphate and sodium molybdate in a mass ratio of 3:2; and the organic rust inhibitory component consists of triethanolamine and triisopropanolamine in a mass ratio of 7:3.

[0060] Comparative Example 2

[0061] The preparation method of the concrete rust-inhibiting internal curing agent in Comparative Example 2 is basically the same as that in Example 1, except that no load component was added in this comparative example.

[0062] Comparative Example 3

[0063] The preparation method of the concrete rust-inhibiting internal curing agent in Comparative Example 3 is basically the same as that in Example 1, except that no healing component was added in this comparative example.

[0064] Comparative Example 4

[0065] The preparation method of the concrete rust-inhibiting internal curing agent in Comparative Example 4 is basically the same as that in Example 1, except that polyacrylic acid resin was not added in this comparative example.

[0066] Comparative Example 5

[0067] The preparation method of the concrete rust-inhibiting internal curing agent of Comparative Example 5 is basically the same as that of Example 1. The difference is that no inorganic rust-inhibiting component was added in this comparative example, and the weight of the organic rust-inhibiting component was 36 parts.

[0068] Comparative Example 6

[0069] The preparation method of the concrete rust-inhibiting internal curing agent of Comparative Example 6 is basically the same as that of Example 1. The difference is that no organic rust-inhibiting component was added in this comparative example, and the weight of the inorganic rust-inhibiting component was 36 parts.

[0070] Test case

[0071] The internal curing agents of the examples and comparative examples were incorporated into the concrete at a dosage of 1.2% of the total mass of the cementitious materials. The concrete mix proportions are shown in Table 1.

[0072] Table 1. Concrete mix proportions (kg / m³) 3 )

[0073] Group cement sand stone water Internal care agent Application examples 330 720 1080 198 3.96 Blank group 330 720 1080 198 /

[0074] Early crack resistance tests were conducted according to the "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete" (GB / T 50082-2019), testing the water seepage height, chloride ion permeability coefficient, and sulfate resistance coefficient of the concrete. Crack repair performance tests were conducted according to Appendix B of the "Technical Specification for Application of Inorganic Waterborne Permeable Crystalline Materials" (T / CECS 848-2021), where crack repair performance refers to the water seepage rate ratio of the specimen. The results are shown in Table 2.

[0075] Table 2 Crack resistance of concrete

[0076]

[0077] As shown in Table 2, compared with the control group, the concrete with added internal curing agent exhibited significantly lower total crack area, water seepage height, and chloride ion permeability coefficient per unit area, and significantly higher sulfate resistance coefficient. This indicates that the internal curing agent prepared in this invention can significantly improve the crack resistance and corrosion prevention performance of concrete. This is because the internal curing agent prepared in this invention can effectively repair micro-cracks generated during concrete service and can exert a long-term rust-inhibiting effect, preventing chloride and sulfate ion erosion and improving the durability of concrete. The effect is particularly optimal under the preparation method and raw material ratio of Example 1.

[0078] Comparing Example 1 and Comparative Example 1 reveals that the preparation method of the internal curing agent in Comparative Example 1, which simply involves mixing the raw materials, significantly reduces the performance indicators of the concrete. This is because simply mixing the raw materials cannot produce an internal curing agent with a hybrid core-shell structure, and antagonistic reactions may exist between the raw materials and between the raw materials and the concrete binder, reducing the effectiveness of the internal curing agent. This demonstrates that compared to simply mixing the raw materials, the internal curing agent prepared by the method of this invention can significantly improve the durability of concrete.

[0079] Compared to Example 1, Comparative Example 2 lacks a load-bearing component, resulting in a lack of carrier for the crystals, preventing crystal aggregation and leading to unsatisfactory densification and higher water permeability in the later stages. Comparative Example 3 lacks a healing component, significantly reducing the concrete's ability to repair cracks in the later stages, allowing external water and corrosive substances to penetrate, and significantly lowering various concrete indicators. Comparative Example 4 lacks a highly absorbent resin, resulting in large early shrinkage, rapid water loss, and numerous non-structural cracks, creating potential for disease expansion. Comparative Example 5 lacks an inorganic rust-inhibiting component, preventing the internal curing agent from exerting a long-term rust-inhibiting effect and weakening the concrete's resistance to chlorides and sulfates. Comparative Example 6 lacks an organic rust-inhibiting component, further weakening the concrete's resistance to chlorides and sulfates. This is because organic rust-inhibiting components can exert a rust-inhibiting effect in the early stages of concrete construction and can also protect the inorganic rust-inhibiting components, preventing premature and excessive release of rust-inhibiting components.

[0080] In summary, the internal curing agent of this invention, through the interaction between raw materials and the coordination of the preparation method, possesses self-curing, self-healing, and rust-inhibiting functions, and has a long-term slow-release effect; it can effectively resist and repair cracks generated during the service life of concrete, exert its self-healing function, prevent the erosion of corrosive ions, and improve the durability of concrete. Changing the raw materials or preparation method will greatly reduce the overall performance of concrete.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a concrete rust-inhibiting internal curing agent, characterized in that, Includes the following steps: S1. Add the loading component and water to a container, homogenize by ultrasonication, add the healing component, and stir at 30-45°C to obtain primary product A; the loading component includes nano-silica and / or fumed silica particles; the healing component includes at least one of sodium silicate, potassium silicate, and lithium silicate. S2. Add superabsorbent resin to the primary product A obtained in step S1, disperse it evenly, add inorganic rust inhibitor, heat to 45-55℃, stir evenly under a protective gas atmosphere to obtain intermediate product B; S3. Add an organic rust inhibitor to intermediate product B, stir evenly at 45-55°C under a protective gas atmosphere, then raise the temperature to 55-65°C and continue stirring under a protective gas atmosphere. After dehydration and drying, the internal curing agent is obtained.

2. The method for preparing a concrete rust-inhibiting internal curing agent according to claim 1, characterized in that, The weight proportions of each component are as follows: 11-17 parts of superabsorbent resin, 13-24 parts of inorganic rust inhibitor, 13-24 parts of organic rust inhibitor, 24-30 parts of healing component, and 20-26 parts of load component.

3. The preparation method of a concrete rust-inhibiting internal curing agent according to claim 1, characterized in that, The organic rust-inhibiting component includes at least one of N,N-dimethylethanolamine, polyacrylamide, triethanolamine, triisopropanolamine, benzotriazole, and imidazoline quaternary ammonium salts; the inorganic rust-inhibiting component includes at least one of sodium monofluorophosphate, sodium molybdate, sodium pentamethasone, sodium hexametaphosphate, ammonium heptamolybdate, and sodium tripolyphosphate.

4. The preparation method of a concrete rust-inhibiting internal curing agent according to claim 1, characterized in that, The organic rust-inhibiting component comprises triethanolamine and triisopropanolamine in a mass ratio of 3:1, and the inorganic rust-inhibiting component comprises sodium monofluorophosphate and sodium molybdate in a mass ratio of 3:

2.

5. The method for preparing a concrete rust-inhibiting internal curing agent according to claim 1, characterized in that, The mass ratio of sodium silicate, potassium silicate, and lithium silicate is 3:1:

1.

6. The method for preparing a concrete rust-inhibiting internal curing agent according to claim 1, characterized in that, The loading components include nano-silica and fumed silica particles in a mass ratio of 7:

13.

7. The concrete rust-inhibiting internal curing agent prepared by the preparation method according to any one of claims 1 to 6.

8. The application of the concrete rust-inhibiting internal curing agent according to claim 7 in concrete, characterized in that, The dosage of the concrete rust-inhibiting internal curing agent is 0.1% to 2% of the cementitious material.

Images