A cement-based material for repairing and protecting superhydrophobic concrete structures, its preparation method and its application

Abstract

This invention discloses a cement-based material for repairing and protecting superhydrophobic concrete structures, comprising the following raw materials in parts by weight: 30-70 parts silicate cement, 30-70 parts sulfoaluminate cement, 5-15 parts fly ash, 100-200 parts 10-110 mesh quartz sand, 25-32 parts water, 0.3-0.5 parts water-reducing agent, 11-24 parts stainless steel fiber, 5-10 parts redispersible latex powder, and 1-2 parts superhydrophobic additive; wherein the superhydrophobic additive is octyltriethoxysilane (TEOS) modified zeolite imidazole metal-organic framework (ZIF-8) material Octyl-Silane@ZIF-8, which is obtained by spontaneously covering ZIF-8 through a sol-gel process after TEOS hydrolysis and condensation under alkaline conditions. The superhydrophobic additive Octyl-Silane@ZIF-8 used in this invention has a simple synthesis process and low material cost. Cement-based materials prepared from it have superhydrophobicity, high impermeability and high compressive strength, with excellent performance and broad application prospects.

Description

Technical Field

[0001] This invention relates to the field of building repair materials technology, and in particular to a cement-based material for repairing and protecting superhydrophobic concrete structures, its preparation method, and its application. Background Art

[0002] The information disclosed in the background section of this invention is intended only to enhance the understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Repairing damaged concrete structures involves not only patching cracks and other structural defects, but more importantly, effectively protecting the damaged areas to prevent secondary damage. Due to the presence of micropores and polar functional groups generated during cement hydration, external moisture can easily penetrate the cementitious material. Various harmful ions, mediated by water, can also seep into the cementitious material. This not only reduces the performance of the cementitious materials used for repair and protection, but more seriously, it prevents long-term effective protection of the damaged structure, hindering the maintenance of its service life.

[0004] Currently, waterproofing methods for cement-based materials mostly involve applying additional protective coatings. However, these additional protective layers suffer from problems such as easy wear and tear, easy detachment, and insufficient adhesion to the cement-based materials. Increasing the density of the cement-based repair and protective materials themselves is also a common method to enhance their waterproofing and seepage resistance. However, blindly pursuing high density in cement-based materials not only results in low seepage resistance and high costs, but also easily leads to problems such as large shrinkage and cracking of the repair and protective materials.

[0005] Adding organic polymers containing hydrophobic functional groups to cement-based materials can significantly reduce their surface energy, greatly improve their hydrophobicity, and effectively enhance their waterproofing and impermeability. For example, patents CN116477902A and CN116354662A disclose a polymer-modified waterproof mortar and its preparation method (reducing water absorption by approximately 72.2% to 0.5%), and a waterproof mortar material with self-healing and anti-corrosion properties and its preparation method (with an impermeability pressure up to 1.5 MPa, exceeding the standard requirement of greater than 0.5 MPa). Both processes utilize the internal addition of organic polymers to enhance the hydrophobicity of the cement-based material, achieving waterproofing and impermeability.

[0006] While the addition of organic polymers does improve the waterproofing and impermeability of repair and protective materials to some extent, it often has an adverse effect on the strength and hydration properties of the materials. Moreover, simply adding polymers only reduces the surface energy of cement-based repair and protective materials and cannot simultaneously improve the micro-nano structure of the surface of the repair material. Consequently, it cannot achieve the surface roughness required for superhydrophobicity, and therefore the efficiency of improving the hydrophobicity of the surface of cement-based repair and protective materials is limited. Summary of the Invention

[0007] In view of this, the present invention provides a cement-based material for repairing and protecting superhydrophobic concrete structures, a preparation method thereof, and its application. While achieving high waterproof and impermeable capabilities, it also has high compressive strength, effectively preventing secondary damage to concrete structures.

[0008] In a first aspect, the present invention provides a cement-based material for repairing and protecting superhydrophobic concrete structures, comprising the following raw materials in parts by weight: 30-70 parts of silicate cement, 30-70 parts of sulfoaluminate cement, 5-15 parts of fly ash, 100-200 parts of 10-110 mesh quartz sand, 25-32 parts of water, 0.3-0.5 parts of water-reducing agent, 11-24 parts of stainless steel fiber, 5-10 parts of redispersible latex powder, and 1-2 parts of superhydrophobic additive;

[0009] The superhydrophobic additive is Octyl-Silane@ZIF-8, a zeolite-like imidazole metal-organic framework (ZIF-8) material modified with n-octyltriethoxysilane (TEOS). It is obtained by spontaneously covering ZIF-8 with TEOS through a sol-gel process after hydrolysis and polycondensation under alkaline conditions.

[0010] This invention modifies ZIF-8 using TEOS, significantly improving its hydrophobicity. TEOS contains a long alkyl chain and three ethoxy groups, which spontaneously cover ZIF-8 via a sol-gel process after hydrolysis and condensation under alkaline conditions. The presence of the long alkyl chain and the condensation reaction of the polar hydroxyl bonds in the cementitious material significantly reduce the surface energy and improve hydrophobicity. Simultaneously, ZIF-8, a zeolite-like micro / nanocrystalline material, acts as a non-reactive micro-aggregate filler with strong water and acid / alkali stability, helping to improve the density, porosity, and compressive strength of the hydration product structure. Its adhesion to the surface of cementitious materials increases the micro / nano roughness, enhancing hydrophobicity. Therefore, the appropriate introduction of Octyl-Silane@ZIF-8 can endow cementitious materials with superhydrophobicity, effectively resisting the intrusion of harmful substances.

[0011] Preferably, the preparation method of Octyl-Silane@ZIF-8 includes the following steps:

[0012] A methanol solution of zinc nitrate hexahydrate and a methanol solution of 2-methylimidazole were mixed to obtain a mixed solution. After stirring at room temperature for a period of time, the mixture was allowed to stand to obtain a ZIF-8 methanol solution. Cetyltrimethylammonium bromide (CTAB) was added to the mixture, and after stirring evenly at room temperature, the pH of the solution was adjusted to alkaline using ammonia. Then, TEOS was added to the alkaline solution, and the mixture was stirred at room temperature for a period of time to obtain the reaction solution. The reaction solution was centrifuged at high speed, and the precipitate was washed and dried to obtain Octyl-Silane@ZIF-8.

[0013] Furthermore, in the mixed solution, the mass ratio of zinc nitrate hexahydrate to 2-methylimidazole is 1.30–1.65, and the mass ratio of zinc nitrate hexahydrate to methanol is 1:30–50. Preferably, in the step of stirring the mixed solution at room temperature for a period of time and then allowing it to stand, the stirring speed is 700–900 r / min, the stirring time is 0.5–2 h, and the standing time is 8–16 h.

[0014] Preferably, the mass ratio of CTAB to the total mass of zinc nitrate hexahydrate and 2-methylimidazole is 1.10 to 1.20; in the step of adding CTAB and stirring evenly at room temperature, the stirring speed is 700 to 900 r / min and the stirring time is 30 to 60 min.

[0015] Preferably, the concentration of the ammonia water is 20-25%; adjusting the pH of the solution to alkaline specifically means adjusting the pH of the solution to 10-12.

[0016] Preferably, the mass ratio of TEOS to the total mass of zinc nitrate hexahydrate and 2-methylimidazole is 1.45 to 1.65. Preferably, in the step of adding TEOS and stirring at room temperature for a period of time, the stirring speed is 700 to 900 r / min and the stirring time is 3 to 5 h.

[0017] Preferably, the high-speed centrifugation speed is 5000-7000 r / min and the time is 5-10 min; the washing is performed by washing with ethanol 2-4 times; and the drying temperature is 50-70℃.

[0018] Preferably, the silicate cement is PO 42.5 type, PO 52.5 type, PI 42.5 type, PI 52.5 type, PI 62.5 type, P.II 52.5 type, or P.II 62.5 type silicate cement; the sulfoaluminate cement is EQC sulfoaluminate special cement, 42.5 type or 52.5 type high belite sulfoaluminate cement, or rapid-hardening sulfoaluminate cement; the fly ash is Grade I or Grade II fly ash; the quartz sand is high-quality quartz sand; the stainless steel fiber is one of the following: bow-shaped stainless steel fiber, end-groove stainless steel fiber, or stainless steel wire fiber, preferably 12-14mm bow-shaped stainless steel fiber; the water is tap water, distilled water, or deionized water.

[0019] Preferably, the water-reducing agent is selected from one of polycarboxylate high-efficiency water-reducing agents, naphthalene sulfonate high-efficiency water-reducing agents, or melamine resin high-efficiency water-reducing agents; the redispersible latex powder is vinyl acetate and ethylene copolymer powder (EVA), ethylene, vinyl chloride and vinyl silicate terpolymer powder (E / Vc / VL), vinyl acetate, ethylene and higher fatty acid vinyl ester terpolymer powder (Vac / E / VeoVa), vinyl acetate and higher fatty acid vinyl ester copolymer powder (Vac / VeoVa), acrylate and styrene copolymer powder (A / S), vinyl acetate, acrylate and higher fatty acid vinyl ester terpolymer powder (Vac / A / VeoVa), vinyl acetate homopolymer powder (PVAc), or styrene and butadiene copolymer powder.

[0020] Secondly, the present invention provides a method for preparing the above-mentioned cement-based material for repairing and protecting superhydrophobic concrete structures, comprising the following steps:

[0021] Silicate cement, sulfoaluminate cement, fly ash, quartz sand, redispersible latex powder, and stainless steel fiber are mixed evenly to obtain premixed dry mortar.

[0022] Water, water-reducing agent and Octyl-Silane@ZIF-8 were mixed evenly and ultrasonically dispersed to obtain a liquid phase preparation solution;

[0023] The liquid phase preparation liquid is poured into the mortar premixed dry material, and sheared and stirred under vacuum conditions. After being mixed evenly, it can be cast into shape.

[0024] Thirdly, the present invention provides the application of the above-mentioned cement-based material for repairing and protecting superhydrophobic concrete structures or the cement-based material for repairing and protecting superhydrophobic concrete structures prepared by the above-mentioned preparation method in the repair of concrete structures.

[0025] As can be seen from the above technical solution, the present invention has achieved the following beneficial effects:

[0026] (1) The cement-based material for repairing and protecting concrete structures prepared in this invention has superhydrophobicity, high impermeability, and high compressive strength. Its 3-day water absorption rate is less than 0.05%, its 28-day compressive strength is higher than 80 MPa, its 28-day impermeability pressure exceeds 2 MPa, and its chloride ion migration coefficient is less than 0.2 × 10⁻⁶. -12 m 2 / s, with excellent performance and broad application prospects;

[0027] (2) The superhydrophobic additive Octyl-Silane@ZIF-8 of the present invention has a simple synthesis process and low material cost. When introduced into cement-based materials, it can not only significantly improve hydrophobicity and impermeability, but also has no adverse effect on other properties, and has good performance. Detailed Implementation

[0028] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0029] This invention does not impose any special restrictions on the source of the reagents; commercially available products well-known to those skilled in the art can be used. The technical solution of this invention will be further described below with reference to specific embodiments.

[0030] Example 1: Preparation of Octyl-Silane@ZIF-8

[0031] 8.1 parts of zinc nitrate hexahydrate were added to 316 parts of methanol, denoted as solution A; 5.3 parts of 2-methylimidazole were added to 316 parts of methanol, denoted as solution B. Solutions A and B were mixed and stirred at 800 rpm for 1 h, and then allowed to stand at room temperature for 12 h to obtain a ZIF-8 methanol solution. 15.5 parts of CTAB were uniformly dispersed in the above solution and stirred at 800 rpm for 45 min. The pH of the resulting solution was adjusted to 11 with ammonia (25%). Then, 21 parts of TEOS were added to the solution, and stirring was continued at room temperature for 4 h. The solution was then centrifuged at 6000 rpm to collect the precipitate. After washing three times with ethanol and drying at 60 °C, the TEOS-modified zeolite-like imidazole metal-organic framework material Octyl-Silane@ZIF-8 was obtained.

[0032] Example 2

[0033] This embodiment provides a cement-based material for repairing and protecting superhydrophobic concrete structures, comprising the following raw materials in parts by weight: 65 parts of PO 42.5 type silicate cement, 35 parts of 52.5 type high belite sulfoaluminate cement, 10 parts of Grade I fly ash, 4.8 parts of 10-20 mesh quartz sand, 4.8 parts of 20-30 mesh quartz sand, 9.6 parts of 30-50 mesh quartz sand, 38.5 parts of 50-70 mesh quartz sand, 38.5 parts of 70-90 mesh quartz sand, 28.8 parts of 90-110 mesh quartz sand, 25.6 parts of tap water, 0.35 parts of polycarboxylate superplasticizer, 24 parts of 12-14mm arc-shaped stainless steel fiber, 5 parts of 5044N type EVA redispersible latex powder, and 1 part of Octyl-Silane@ZIF-8.

[0034] The silicate cement, sulfoaluminate cement, fly ash, quartz sand, redispersible latex powder, and stainless steel fiber are mixed evenly to obtain a premixed dry mortar mix. Water, water-reducing agent, and Octyl-Silane@ZIF-8 are mixed evenly and ultrasonically dispersed to obtain a liquid phase preparation liquid. The liquid phase preparation liquid is poured into the premixed dry mortar mix and sheared and stirred under vacuum conditions. After being mixed evenly, it is cast into shape.

[0035] Example 3

[0036] This embodiment provides a cement-based material for repairing and protecting superhydrophobic concrete structures, comprising the following raw materials in parts by weight: 50 parts of PI 42.5 type silicate cement, 50 parts of EQC sulfoaluminate special cement, 10 parts of Grade II fly ash, 4.8 parts of 10-20 mesh quartz sand, 4.8 parts of 20-30 mesh quartz sand, 9.6 parts of 30-50 mesh quartz sand, 38.5 parts of 50-70 mesh quartz sand, 38.5 parts of 70-90 mesh quartz sand, 28.8 parts of 90-110 mesh quartz sand, 30 parts of tap water, 0.4 parts of naphthalene sulfonate high-efficiency water-reducing agent, 12 parts of 12-14mm end-groove stainless steel fiber, 10 parts of PVAc latex powder, and 1.5 parts of Octyl-Silane@ZIF-8.

[0037] The silicate cement, sulfoaluminate cement, fly ash, quartz sand, redispersible latex powder, and stainless steel fiber are mixed evenly to obtain a premixed dry mortar mix. Water, water-reducing agent, and Octyl-Silane@ZIF-8 are mixed evenly and ultrasonically dispersed to obtain a liquid phase preparation liquid. The liquid phase preparation liquid is poured into the premixed dry mortar mix and sheared and stirred under vacuum conditions. After being mixed evenly, it is cast into shape.

[0038] Example 4

[0039] Unlike Example 3, the amount of Octyl-Silane@ZIF-8 added to the raw materials was 2.0 parts.

[0040] Comparative Example 1

[0041] Unlike Example 3, the amount of Octyl-Silane@ZIF-8 added to the raw materials was 0.1 parts.

[0042] Comparative Example 2

[0043] Unlike Example 3, the Octyl-Silane@ZIF-8 material was replaced with ZIF-8 metal-organic framework material.

[0044] Comparative Example 3

[0045] Unlike Example 3, Octyl-Silane@ZIF-8 was not added to the raw materials.

[0046] Application Examples

[0047] The following properties were measured for the cement-based materials used in the repair and protection of concrete structures in Examples 2-3 and Comparative Examples 1-4.

[0048] Compressive and flexural strength tests: The tests were conducted in accordance with the specifications of the "Test Method for Strength of Cement Mortar (ISO Method)" (GB / T17671-1999) to test the 28-day flexural and compressive strength of mortar blocks with different mix proportions.

[0049] Water absorption test: The water absorption test of mortar refers to the provisions of the standard "Repair Mortar" (JC / T2381-2016) to measure the one-dimensional water absorption capacity of cement-based materials.

[0050] Contact angle and roll-off angle tests: The sample surface must be cleaned with ethanol before the experiment. The contact angle test uses a contact angle meter to measure the contact angle between a horizontal cement-based material surface and a water droplet. The roll-off angle test measures the difference between the forward angle (the angle between the front of the rolling water droplet and the sample surface) and the backward angle (the angle between the back of the rolling water droplet and the sample surface) when the water droplet begins to roll spontaneously on the sample surface (as the angle of inclination of the sample gradually increases). Three sample surfaces of the same mix are used, and each surface is measured three times. The average of the nine contact angles or roll-off angles represents the contact angle or roll-off angle between the cement-based material surface and water.

[0051] Chloride ion penetration resistance test: The chloride ion penetration resistance test is conducted in accordance with the provisions of the standard "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete" (GB / T 50082-2009), and is determined by the rapid chloride ion migration coefficient method (or RCM method).

[0052] The test results are shown in Table 1. As shown in Examples 2-4, this invention, by introducing a TEOS-modified zeolite-imidazolium metal-organic framework Octyl-Silane@ZIF-8, significantly improves the hydrophobicity of cement-based materials while also improving their strength and resistance to chloride ion attack. A comparison of Examples 3 and 4 shows that even after adding 1.5 parts, while the performance remains excellent, the improvement is not significant, resulting in low efficiency. Comparative Example 1 shows that when the Octyl-Silane@ZIF-8 dosage is insufficient, the material falls far short of superhydrophobic requirements. Comparative Examples 2 and 3 show that the cement-based materials without Octyl-Silane@ZIF-8 exhibit only average performance in all aspects, failing to meet the standards for hydrophobic materials. The ZIF-8-modified cement-based materials have high strength and improved hydrophobicity to some extent, but still lag significantly behind superhydrophobic materials. Compared with other hydrophobic cement-based materials, the cement-based materials prepared in this invention exhibit significantly superior performance compared to those using ordinary polymer-modified cement-based materials. They maintain low water absorption while possessing high compressive strength and high impermeability. Furthermore, the cement-based materials prepared in Examples 2-4 of this invention all have water contact angles exceeding 150°, and the dynamic rolling contact angle can be controlled within 10°, classifying them as typical superhydrophobic materials. The material in Example 3 exhibits the best performance, achieving a flexural strength of 20.9 MPa and a compressive strength of 92.7 MPa after 28 days of curing. Its 3-day water absorption rate is as low as 0.02%, demonstrating superhydrophobic properties. It also boasts a water contact angle as high as 160.3°, a rolling contact angle of 4.7°, and a chloride ion permeability resistance coefficient of 0.0981 × 10⁻⁶. -12 m 2 / s is a cement-based material for repairing and protecting concrete structures with extremely strong hydrophobicity and impermeability. It has broad application prospects in coastal concrete engineering, repair of damaged concrete structures, and protection.

[0053] Table 1. Performance test data of the cement-based material of this invention and performance data of other patents.

[0054]

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cement-based material for repairing and protecting superhydrophobic concrete structures, characterized in that, The raw materials include the following parts by weight: 30-70 parts silicate cement, 30-70 parts sulfoaluminate cement, 5-15 parts fly ash, 100-200 parts 10-110 mesh quartz sand, 25-32 parts water, 0.3-0.5 parts water-reducing agent, 11-24 parts stainless steel fiber, 5-10 parts redispersible latex powder, and 1-2 parts superhydrophobic additive; The superhydrophobic additive is Octyl-Silane@ZIF-8, a zeolite-like imidazole metal-organic framework ZIF-8 material modified with n-octyltriethoxysilane. It is obtained by spontaneously covering ZIF-8 with n-octyltriethoxysilane through a sol-gel process after hydrolysis and condensation under alkaline conditions. The preparation method of Octyl-Silane@ZIF-8 includes the following steps: A methanol solution of zinc nitrate hexahydrate and a methanol solution of 2-methylimidazole were mixed to obtain a mixed solution. After stirring at room temperature for a period of time, the mixture was allowed to stand to obtain a ZIF-8 methanol solution. Hexadecyltrimethylammonium bromide was added to the mixture, and after stirring evenly at room temperature, the pH of the solution was adjusted to alkaline using ammonia. Then, n-octyltriethoxysilane was added to the alkaline solution, and the mixture was stirred at room temperature for a period of time to obtain the reaction solution. The reaction solution was centrifuged at high speed, and the precipitate was washed and dried to obtain Octyl-Silane@ZIF-8.

2. The cement-based material for repairing and protecting superhydrophobic concrete structures as described in claim 1, characterized in that, In the mixed solution, the mass ratio of zinc nitrate hexahydrate to 2-methylimidazole is 1.30~1.65, and the mass ratio of zinc nitrate hexahydrate to methanol is 1:30~50.

3. The cement-based material for repairing and protecting superhydrophobic concrete structures as described in claim 1, characterized in that, In the step of stirring the mixed solution at room temperature for a period of time and then letting it stand, the stirring speed is 700~900 r / min, the stirring time is 0.5~2h, and the standing time is 8~16h.

4. The cement-based material for repairing and protecting superhydrophobic concrete structures as described in claim 1, characterized in that, The mass ratio of the total mass of hexadecyltrimethylammonium bromide to zinc nitrate hexahydrate and 2-methylimidazole is 1.10~1.20; in the step of adding hexadecyltrimethylammonium bromide and stirring evenly at room temperature, the stirring speed is 700~900 r / min and the stirring time is 30~60 min.

5. The cement-based material for repairing and protecting superhydrophobic concrete structures as described in claim 1, characterized in that, The concentration of the ammonia water is 20-25%; the pH of the solution is adjusted to be alkaline.

6. The cement-based material for repairing and protecting superhydrophobic concrete structures as described in claim 5, characterized in that, The pH of the solution is adjusted to 10-12.

7. The cement-based material for repairing and protecting superhydrophobic concrete structures as described in claim 1, characterized in that, The mass ratio of the total mass of n-octyltriethoxysilane to zinc nitrate hexahydrate and 2-methylimidazole is 1.45 to 1.

65.

8. The cement-based material for repairing and protecting superhydrophobic concrete structures as described in claim 1, characterized in that, In the step of adding n-octyltriethoxysilane and stirring at room temperature for a period of time, the stirring speed is 700~900 r / min and the stirring time is 3~5 h.

9. The cement-based material for repairing and protecting superhydrophobic concrete structures as described in claim 1, characterized in that, The high-speed centrifugation speed is 5000~7000 r / min, and the time is 5~10 min; the washing is performed by washing with ethanol 2~4 times; the drying temperature is 50~70 ℃.

10. The cement-based material for repairing and protecting superhydrophobic concrete structures as described in claim 1, characterized in that, The silicate cement is PO 42.5 type, PO 52.5 type, PI 42.5 type, PI 52.5 type, PI 62.5 type, P.II 52.5 type, or P.II 62.5 type silicate cement; the sulfoaluminate cement is EQC sulfoaluminate special cement, 42.5 type or 52.5 type high belite sulfoaluminate cement, or rapid-hardening sulfoaluminate cement; the fly ash is Grade I or Grade II fly ash; the quartz sand is high-quality quartz sand; the stainless steel fiber is bow-shaped stainless steel fiber, end-grooved stainless steel fiber, or stainless steel wire fiber; the water is tap water, distilled water, or deionized water.

11. The cement-based material for repairing and protecting superhydrophobic concrete structures as described in claim 1, characterized in that, The stainless steel fiber is a 12-14 mm arc-shaped stainless steel fiber.

12. The cement-based material for repairing and protecting superhydrophobic concrete structures as described in claim 1, characterized in that, The water-reducing agent is one of polycarboxylate high-efficiency water-reducing agents, naphthalene sulfonate high-efficiency water-reducing agents, and melamine resin high-efficiency water-reducing agents; the redispersible latex powder is vinyl acetate and ethylene copolymer powder, ethylene and vinyl chloride and vinyl silicate terpolymer powder, vinyl acetate and ethylene and higher fatty acid vinyl ester terpolymer powder, vinyl acetate and higher fatty acid vinyl ester copolymer powder, acrylate and styrene copolymer powder, vinyl acetate and acrylate and higher fatty acid vinyl ester terpolymer powder, vinyl acetate homopolymer powder, or styrene and butadiene copolymer powder.

13. A method for preparing a cement-based material for repairing and protecting superhydrophobic concrete structures as described in any one of claims 1-12, characterized in that, Includes the following steps: Silicate cement, sulfoaluminate cement, fly ash, quartz sand, redispersible latex powder, and stainless steel fiber are mixed evenly to obtain premixed dry mortar. Water, water-reducing agent and Octyl-Silane@ZIF-8 were mixed evenly and ultrasonically dispersed to obtain a liquid phase preparation solution; The liquid phase preparation liquid is poured into the mortar premixed dry material, and sheared and stirred under vacuum conditions. After being mixed evenly, it can be cast into shape.

14. The application of the cement-based material for repairing and protecting superhydrophobic concrete structures as described in any one of claims 1-12 or the cement-based material for repairing and protecting superhydrophobic concrete structures prepared by the preparation method described in claim 13 in the repair of concrete structures.

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