Mirror concrete and preparation method thereof

Abstract

The invention relates to the technical field of concrete, and discloses mirror concrete and a preparation method thereof. Comprising the following components in parts by weight: 360 to 400 parts by weight of cement, 60 to 100 parts by weight of fly ash, 250 to 320 parts by weight of fine aggregate, 300 to 500 parts by weight of coarse aggregate, 1 to 3 parts by weight of a polycarboxylic acid water reducer, 4 to 6 parts by weight of an additive, 2 to 3 parts by weight of modified ferrocene, 80 to 100 parts by weight of water, 15 to 20 parts by weight of water-soluble acrylic resin and 2 to 3 parts by weight of carboxyl modified silane. The mirror concrete provided by the invention has good gloss and mechanical properties.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete, in particular to mirror concrete and a preparation method thereof. Background Art

[0002] Mirror concrete, a high-end concrete product, is increasingly used in modern architecture due to its unique appearance and numerous advantages. Its precise geometric dimensions, straight columns and edges, dense interior, smooth, mirror-like surface, consistent color, and fine, refined, dense texture, resulting in a nearly homogeneous marble-like quality, all contribute to its unique mirror-like decorative aesthetic. Compared to ordinary concrete, mirror concrete not only offers a beautiful appearance but also eliminates the need for subsequent plastering and finishing processes, significantly reducing construction timelines and costs.

[0003] However, the production of mirror-finish concrete remains difficult. During the concrete production process, the influence of raw materials and construction conditions, such as fluctuations in the quality and measurement of raw materials such as cement, aggregates, and admixtures; fluctuations in the water-cement ratio caused by changes in water consumption or aggregate moisture content; and climate changes during mixing, transportation, pouring, and construction, can cause the discreteness of concrete, affecting its performance and appearance. While some existing technologies have improved concrete performance in certain aspects, they have not yet fully resolved the problems encountered in the preparation of mirror-finish concrete. For example, some technologies improve the crack resistance of concrete but have little effect on its appearance; some technologies can improve the surface texture of concrete but have not yet achieved the effect of a mirror-like surface. Summary of the Invention

[0004] (1) Technical problems solved In view of the deficiencies in the prior art, the present invention provides a mirror concrete and a preparation method thereof, which has good gloss and mechanical properties.

[0005] (2) Technical solution To achieve the above object, the present invention provides the following technical solution: a mirror concrete comprising the following components by weight: 360-400 parts by weight of cement, 60-100 parts by weight of fly ash, 250-320 parts by weight of fine aggregate, 300-500 parts by weight of coarse aggregate, 1-3 parts by weight of a polycarboxylate water-reducing agent, 4-6 parts by weight of an admixture, 2-3 parts by weight of modified ferrocene, 80-100 parts by weight of water, 15-20 parts by weight of a water-soluble acrylic resin, and 2-3 parts by weight of a carboxyl-modified silane; The preparation method of the carboxyl-modified silane is: S1. Under a nitrogen atmosphere, N-cyclohexyl monoethanolamine, potassium carbonate catalyst, and hydroquinone polymerization inhibitor were added to tetrahydrofuran solvent, stirred and mixed, and acryloyloxypropyltrimethoxysilane was added thereto. The temperature was raised to 30-35°C and the reaction was carried out for 2-3 hours. After the reaction was completed, the mixture was filtered, washed, and dried to obtain silane intermediate 1; S2. Add 4-8 mmol of intermediate 1 and 5-6 mmol of itaconic anhydride to 45-60 mL of acetone solvent, stir and mix, and continue to add 0.2-0.26 mmol of p-toluenesulfonic acid catalyst. React at 52-56°C for 4-7 hours, and then perform rotary distillation to obtain carboxyl-modified silane.

[0006] Furthermore, the usage ratio of tetrahydrofuran solvent, N-cyclohexyl monoethanolamine, potassium carbonate catalyst, hydroquinone polymerization inhibitor, and acryloxypropyltrimethoxysilane in S1 is 50-65 mL: 1.51-1.53 ​​g: 0.01-0.012 g: 0.02-0.03 g: 2.3-2.7 g.

[0007] Furthermore, the preparation method of the admixture is: S3. To 50-60 mL of N,N-dimethylformamide solvent, 1.6-1.7 mmol of 1,3-bis(dimethylamino)-2-propanol and 0.1-0.2 mmol of triethylamine were added and stirred to dissolve. 0.9-1.1 mmol of adipic acid chloride was added dropwise thereto. After the addition was complete, the temperature was raised to 25-32 ° C for reaction. After the reaction was completed, the reaction was filtered and the solvent was removed by rotary evaporation to obtain intermediate 2; S4. Add 3-bromo-propyltrimethylammonium bromide and intermediate 2 to an ethanol solvent, stir and mix, react at 80-90°C for 24-26h, wash with ethanol after the reaction, and dry to obtain an admixture.

[0008] Furthermore, the reaction time in S3 is 2-4 hours.

[0009] Furthermore, the usage ratio of the ethanol solvent, 3-bromo-propyltrimethylammonium bromide, and the intermediate 2 in the S4 is 45-55 mL: 3-6 mmol: 2.3-2.7 mmol.

[0010] Furthermore, the preparation method of the modified ferrocene is as follows: 0.27-0.31 g of 1-(3-aminopropyl)imidazole dissolved in 20-25 ml of anhydrous ethanol is added to a reactor, stirred and heated under N2 protection, and 1.05-1.07 g of ferrocene formaldehyde solution dissolved in 40-45 mL of anhydrous ethanol is slowly added dropwise. After the addition is completed in 0.4-0.5 h, the reaction is continued for 3-4 h, cooled, filtered, recrystallized from ethanol 3 times, and vacuum dried to obtain modified ferrocene.

[0011] Furthermore, the heating temperature is 70-80°C.

[0012] Furthermore, the preparation method of the mirror concrete is: adding cement, fly ash, fine aggregate and coarse aggregate into a blender and stirring to mix, then adding 50-60% of the water in the raw materials, stirring for 2-3 minutes, and then continuously adding polycarboxylate water reducer, admixture, carboxyl modified silane, modified ferrocene and all the remaining water in the raw materials into the system, continuing to stir for 2-3 minutes, pouring, vibrating and compacting, removing the formwork 48 hours after the pouring is completed, and after demolding, sprinkling water on the surface of the specimen to ensure that the surface is fully moistened, then covering it with a transparent film for sealing and curing, and after curing for 28 days, wiping the surface dry, placing it in a 50°C oven for drying for 48 hours, and coating it with water-soluble acrylic resin after cooling to room temperature to obtain mirror concrete.

[0013] (3) Beneficial technical effects In the above reaction process, the amino group in 1-(3-aminopropyl)imidazole and the aldehyde group in the ferrocene formaldehyde solution undergo condensation reaction to generate a Schiff base, and the imidazole group is introduced to obtain modified ferrocene.

[0014] By coating the concrete surface with water-soluble acrylic resin, a uniform film is formed on the surface, which enhances the surface smoothness and makes the concrete achieve a mirror effect.

[0015] The siloxane groups contained in the carboxyl-modified silane react with the cement hydration products in the concrete to generate a stable silicon-oxygen bond network, fill the internal pores of the concrete, and improve the density of the microstructure. This effect can reduce stress concentration points, thereby improving the mechanical properties of the concrete. The carboxyl groups in the carboxyl-modified silane also increase the durability of the concrete; the quaternary ammonium salt groups in the admixture can be adsorbed on the surface of cement particles, improve the dispersibility of the cement paste, promote more complete cement hydration, reduce the strength loss caused by uneven hydration, and help improve the mechanical properties. In addition, the reaction of 3-bromo-propyltrimethylammonium bromide with intermediate 2 increases the degree of substitution of the quaternary ammonium salt, further improving the mechanical properties. The ferrocene in the modified ferrocene has a stable chemical structure and good dispersibility. It can fill the micropores inside the concrete and refine the grains of the hydration products. The iron element in its molecule can form a coordination compound with the cement hydration products, enhancing the structural integrity and thus improving the mechanical properties. The nitrogen atom in the Schiff base group has a lone pair of electrons and can form coordination bonds with metal ions such as calcium ions and aluminum ions produced during the cement hydration process. Its polar structure can enhance the adsorption of cement paste and aggregate surface, reduce microcracks, and thus improve the mechanical properties of concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the reaction formula of silane intermediate 1. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Cement used was ordinary Portland cement with a P·O 42.5 ratio from Guangzhou Shijing Deqing Cement Plant Co., Ltd. Fly ash used was Grade II fly ash produced by Xiamen Yicai Fly Ash Co., Ltd. Fine aggregate used was river sand from Shuncheng Building Materials Business Department in Chao'an District, Chaozhou City. Coarse aggregate used was biotite granite from the Shantangwei Quarry in Xiabao Town, Xingning City, with a particle size of 20 mm. A high-performance polycarboxylate water-reducing agent (retarded-setting type) from Sichuan Dongrun Baisheng New Materials Co., Ltd. was used as the water-reducing agent, with a water-reducing rate of ≥25% and a solids content of 21× (1 ± 5%). Tap water was used for mixing. Water-soluble acrylic resin used was WH-282 (PC-2) from Guangzhou Wanhua New Materials Technology Co., Ltd.

[0020] Formwork: Use 400 mm × 100 mm × 100 mm composite steel formwork.

[0021] Example 1 A mirror concrete comprising the following components by weight: 360 parts by weight of cement, 60 parts by weight of fly ash, 250 parts by weight of fine aggregate, 300 parts by weight of coarse aggregate, 1 part by weight of a polycarboxylate water-reducing agent, 4 parts by weight of an admixture, 2 parts by weight of modified ferrocene, 80 parts by weight of water, 15 parts by weight of a water-soluble acrylic resin, and 2 parts by weight of a carboxyl-modified silane; The preparation method of the carboxyl-modified silane is: S1. Under a nitrogen atmosphere, 1.51 g of N-cyclohexyl monoethanolamine, 0.01 g of potassium carbonate catalyst, and 0.02 g of hydroquinone polymerization inhibitor were added to 50 mL of tetrahydrofuran solvent and stirred. 2.3 g of acryloxypropyltrimethoxysilane was added thereto and the temperature was raised to 30°C for 2 h. After the reaction, the mixture was filtered, washed, and dried to obtain silane intermediate 1. S2. Add 4 mmol of intermediate 1 and 5 mmol of itaconic anhydride to 45 mL of acetone solvent, stir and mix, and then add 0.2 mmol of p-toluenesulfonic acid catalyst. React at 52°C for 4 h. After reaction, perform rotary distillation to obtain carboxyl-modified silane.

[0022] The preparation method of the admixture is: S3. To 50 mL of N,N-dimethylformamide solvent, 1.6 mmol of 1,3-bis(dimethylamino)-2-propanol and 0.1 mmol of triethylamine were added and stirred to dissolve. 0.9 mmol of adipoyl chloride was added dropwise. After the addition was complete, the mixture was heated to 25°C and reacted for 2 h. After the reaction was completed, the mixture was filtered and the solvent was removed by rotary evaporation to obtain intermediate 2. S4. Add 3 mmol of 3-bromopropyltrimethylammonium bromide and 2.3 mmol of intermediate 2 to 45 mL of ethanol solvent, stir and mix, react at 80°C for 24 h, wash with ethanol after the reaction, and dry to obtain an admixture.

[0023] The preparation method of the modified ferrocene is as follows: 0.27 g of 1-(3-aminopropyl)imidazole dissolved in 20 ml of anhydrous ethanol is added to a reactor, and under N2 protection, the mixture is stirred and heated to 70°C, and 1.05 g of ferrocene formaldehyde solution dissolved in 40 mL of anhydrous ethanol is slowly added dropwise. After the addition is completed in 0.4 h, the reaction is continued for 3 h, the mixture is cooled, filtered, recrystallized from ethanol three times, and vacuum dried to obtain the modified ferrocene.

[0024] The preparation method of the mirror concrete comprises the following steps: adding cement, fly ash, fine aggregate, and coarse aggregate into a blender and stirring to mix; then adding 50% of the water in the raw materials; stirring for 2 minutes; continuously adding a polycarboxylate water-reducing agent, an admixture, a carboxyl-modified silane, a modified ferrocene, and all the remaining water in the raw materials into the system; continuing stirring for 2 minutes; pouring, vibrating, and compacting the mixture; removing the formwork 48 hours after the pouring is completed; and after the formwork is removed, sprinkling water on the surface of the test piece to ensure that the surface is fully moistened; then covering it with a transparent film for sealing and curing; and after curing for 28 days, wiping the surface dry and placing it in an oven at 50° C. for drying for 48 hours. After cooling to room temperature, coating with a water-soluble acrylic resin to obtain the mirror concrete.

[0025] Example 2 A mirror concrete comprising the following components by weight: 400 parts by weight of cement, 100 parts by weight of fly ash, 320 parts by weight of fine aggregate, 500 parts by weight of coarse aggregate, 3 parts by weight of a polycarboxylate water-reducing agent, 6 parts by weight of an admixture, 3 parts by weight of modified ferrocene, 100 parts by weight of water, 20 parts by weight of a water-soluble acrylic resin, and 3 parts by weight of a carboxyl-modified silane; The preparation method of the carboxyl-modified silane is: S1. Under a nitrogen atmosphere, 1.53 g of N-cyclohexyl monoethanolamine, 0.012 g of potassium carbonate catalyst, and 0.03 g of hydroquinone polymerization inhibitor were added to 65 mL of tetrahydrofuran solvent and stirred. 2.7 g of acryloxypropyltrimethoxysilane was added thereto and the temperature was raised to 35°C for 3 h. After the reaction, the mixture was filtered, washed, and dried to obtain silane intermediate 1. S2. Add 8 mmol of intermediate 1 and 6 mmol of itaconic anhydride to 60 mL of acetone solvent, stir and mix, and then add 0.26 mmol of p-toluenesulfonic acid catalyst. React at 56°C for 7 h. After reaction, perform rotary distillation to obtain carboxyl-modified silane.

[0026] The preparation method of the admixture is: S3. To 60 mL of N,N-dimethylformamide solvent, 1.7 mmol of 1,3-bis(dimethylamino)-2-propanol and 0.2 mmol of triethylamine were added and stirred to dissolve. 1.1 mmol of adipoyl chloride was added dropwise. After the addition was complete, the mixture was heated to 32°C and reacted for 4 h. After the reaction was completed, the mixture was filtered and the solvent was removed by rotary evaporation to obtain intermediate 2. S4. Add 6 mmol of 3-bromopropyltrimethylammonium bromide and 2.7 mmol of intermediate 2 to 55 mL of ethanol solvent, stir and mix, and react at 90°C for 26 hours. After the reaction, wash with ethanol and dry to obtain an admixture.

[0027] The preparation method of the modified ferrocene is as follows: 0.31 g of 1-(3-aminopropyl)imidazole dissolved in 25 ml of anhydrous ethanol is added to a reactor, and under N2 protection, the mixture is stirred and heated to 80°C, and 1.07 g of ferrocene formaldehyde solution dissolved in 45 mL of anhydrous ethanol is slowly added dropwise. After the addition is completed in 0.5 h, the reaction is continued for 4 h, the mixture is cooled, filtered, recrystallized from ethanol three times, and vacuum dried to obtain the modified ferrocene.

[0028] The preparation method of the mirror concrete comprises the following steps: adding cement, fly ash, fine aggregate, and coarse aggregate into a blender and stirring to mix; then adding 60% of the water in the raw materials; stirring for 3 minutes; then adding a polycarboxylate water reducer, an admixture, a carboxyl-modified silane, a modified ferrocene, and all the remaining water in the raw materials into the system; continuing to stir for 3 minutes; pouring, vibrating, and compacting the mixture; removing the formwork 48 hours after the pouring is completed; and after the formwork is removed, sprinkling water on the surface of the specimen to ensure that the surface is fully moistened; then covering it with a transparent film for sealing and curing; and after curing for 28 days, wiping the surface dry and placing it in an oven at 50° C. for drying for 48 hours. After cooling to room temperature, coating with a water-soluble acrylic resin to obtain the mirror concrete.

[0029] Example 3 A mirror concrete comprising the following components by weight: 380 parts by weight of cement, 70 parts by weight of fly ash, 280 parts by weight of fine aggregate, 400 parts by weight of coarse aggregate, 2 parts by weight of a polycarboxylate water-reducing agent, 5 parts by weight of an admixture, 2.5 parts by weight of modified ferrocene, 90 parts by weight of water, 18 parts by weight of a water-soluble acrylic resin, and 2.4 parts by weight of a carboxyl-modified silane; The preparation method of the carboxyl-modified silane is: S1. Under a nitrogen atmosphere, 1.52 g of N-cyclohexyl monoethanolamine, 0.011 g of potassium carbonate catalyst, and 0.025 g of hydroquinone polymerization inhibitor were added to 55 mL of tetrahydrofuran solvent and stirred. 2.6 g of acryloxypropyltrimethoxysilane was added and the temperature was raised to 32°C for 2 h. After the reaction, the mixture was filtered, washed, and dried to obtain silane intermediate 1. S2. Add 6 mmol of intermediate 1 and 5.5 mmol of itaconic anhydride to 50 mL of acetone solvent, stir and mix, and then add 0.23 mmol of p-toluenesulfonic acid catalyst. React at 54°C for 5 h. After reaction, perform rotary distillation to obtain carboxyl-modified silane.

[0030] The preparation method of the admixture is: S3. To 55 mL of N,N-dimethylformamide solvent, 1.6 mmol of 1,3-bis(dimethylamino)-2-propanol and 0.16 mmol of triethylamine were added and stirred to dissolve. 0.9 mmol of adipoyl chloride was added dropwise. After the addition was complete, the mixture was heated to 28°C and reacted for 3 h. After the reaction was completed, the mixture was filtered and the solvent was removed by rotary evaporation to obtain intermediate 2. S4. Add 4 mmol of 3-bromopropyltrimethylammonium bromide and 2.5 mmol of intermediate 2 to 50 mL of ethanol solvent, stir and mix, react at 87°C for 25 h, wash with ethanol after the reaction, and dry to obtain an admixture.

[0031] The preparation method of the modified ferrocene is as follows: 0.29 g of 1-(3-aminopropyl)imidazole dissolved in 23 ml of anhydrous ethanol is added to a reactor, and under N2 protection, the mixture is stirred and heated to 75°C, and 1.06 g of ferrocene formaldehyde solution dissolved in 42 mL of anhydrous ethanol is slowly added dropwise. After the addition is completed in 0.4 h, the reaction is continued for 3 h, the mixture is cooled, filtered, recrystallized from ethanol three times, and vacuum dried to obtain the modified ferrocene.

[0032] The preparation method of the mirror concrete comprises the following steps: adding cement, fly ash, fine aggregate, and coarse aggregate into a blender and stirring to mix; then adding 55% of the water in the raw materials; stirring for 2 minutes; continuously adding a polycarboxylate water-reducing agent, an admixture, a carboxyl-modified silane, a modified ferrocene, and all the remaining water in the raw materials into the system; continuing stirring for 3 minutes; pouring, vibrating, and compacting the mixture; removing the formwork 48 hours after the pouring is completed; and after the formwork is removed, sprinkling water on the surface of the test piece to ensure that the surface is fully moistened; then covering it with a transparent film for sealing and curing; and after curing for 28 days, wiping the surface dry and placing it in an oven at 50° C. for drying for 48 hours. After cooling to room temperature, coating with a water-soluble acrylic resin to obtain the mirror concrete.

[0033] Comparative Example 1 The difference between this comparative example and Example 3 is that no admixture is added.

[0034] Comparative Example 2 The difference between this comparative example and Example 3 is that no modified ferrocene is added.

[0035] Comparative Example 3 The difference between this comparative example and Example 3 is that no water-soluble acrylic resin is coated.

[0036] Comparative Example 4 The difference between this comparative example and Example 3 is that no carboxyl-modified silane is added.

[0037] Performance Testing Examples 1-3 and Comparative Examples 1-3 used rectangular concrete specimens measuring 400 mm × 100 mm × 100 mm. Gloss was measured using a gloss meter at a 60° angle, in accordance with GB / T9754-2007, "Paints and varnishes - Determination of specular gloss at 20, 60, and 85° for paint films without metallic pigments." Compressive strength tests were conducted in accordance with GB / T50081-2002, "Standard for Test Methods for Mechanical Properties of Ordinary Concrete," and splitting tensile strength tests were conducted in accordance with GB / T50081-2002, "Standard for Test Methods for Mechanical Properties of Ordinary Concrete."

[0038] Table 1: Gloss and mechanical properties tests.

[0039]

[0040] It can be seen from Table 1 that the mirror concrete of the present invention has good mechanical properties and glossiness.

[0041] It should be noted that, in this document, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

[0043] Those skilled in the art should understand that the above descriptions are only some specific embodiments of the present invention, rather than all embodiments.

Claims

1. A mirror concrete, characterized in that: The invention comprises the following components by weight: 360-400 parts by weight of cement, 60-100 parts by weight of fly ash, 250-320 parts by weight of fine aggregate, 300-500 parts by weight of coarse aggregate, 1-3 parts by weight of polycarboxylate water-reducing agent, 4-6 parts by weight of admixture, 2-3 parts by weight of modified ferrocene, 80-100 parts by weight of water, 15-20 parts by weight of water-soluble acrylic resin, and 2-3 parts by weight of carboxyl-modified silane. The preparation method of the carboxyl-modified silane is: S1. Under a nitrogen atmosphere, N-cyclohexyl monoethanolamine, potassium carbonate catalyst, and hydroquinone polymerization inhibitor were added to tetrahydrofuran solvent, stirred and mixed, and acryloyloxypropyltrimethoxysilane was added thereto. The temperature was raised to 30-35°C and the reaction was carried out for 2-3 hours. After the reaction was completed, the mixture was filtered, washed, and dried to obtain silane intermediate 1; S2. Add 4-8 mmol of intermediate 1 and 5-6 mmol of itaconic anhydride to 45-60 mL of acetone solvent, stir and mix, and continue to add 0.2-0.26 mmol of p-toluenesulfonic acid catalyst. React at 52-56°C for 4-7 hours, and then perform rotary distillation to obtain carboxyl-modified silane.

2. The mirror concrete according to claim 1, characterized in that The amount ratio of tetrahydrofuran solvent, N-cyclohexyl monoethanolamine, potassium carbonate catalyst, hydroquinone polymerization inhibitor, and acryloxypropyltrimethoxysilane in S1 is 50-65 mL: 1.51-1.53g: 0.01-0.012g: 0.02-0.03g: 2.3-2.7g.

3. The mirror concrete according to claim 1, characterized in that: The preparation method of the admixture is: S3. To 50-60 mL of N,N-dimethylformamide solvent, 1.6-1.7 mmol of 1,3-bis(dimethylamino)-2-propanol and 0.1-0.2 mmol of triethylamine were added and stirred to dissolve. 0.9-1.1 mmol of adipic acid chloride was added dropwise thereto. After the addition was complete, the temperature was raised to 25-32 ° C for reaction. After the reaction was completed, the reaction was filtered and the solvent was removed by rotary evaporation to obtain intermediate 2; S4. Add 3-bromo-propyltrimethylammonium bromide and intermediate 2 to an ethanol solvent, stir and mix, react at 80-90°C for 24-26h, wash with ethanol after the reaction, and dry to obtain an admixture.

4. The mirror concrete according to claim 2, characterized in that: The reaction time in S3 is 2-4 hours.

5. The mirror concrete according to claim 2, characterized in that: The usage ratio of the ethanol solvent, 3-bromo-propyltrimethylammonium bromide, and the intermediate 2 in the S4 is 45-55 mL: 3-6 mmol: 2.3-2.7 mmol.

6. The mirror concrete according to claim 1, characterized in that: The preparation method of the modified ferrocene is as follows: 0.27-0.31 g of 1-(3-aminopropyl)imidazole dissolved in 20-25 ml of anhydrous ethanol is added to a reactor, and under N2 protection, the mixture is stirred and heated, and 1.05-1.07 g of ferrocene formaldehyde solution dissolved in 40-45 mL of anhydrous ethanol is slowly added dropwise. After the addition is completed in 0.4-0.5 h, the reaction is continued for 3-4 h, the mixture is cooled, filtered, recrystallized from ethanol three times, and vacuum dried to obtain the modified ferrocene.

7. The mirror concrete according to claim 6, characterized in that: The heating temperature is 70-80°C.

8. A method for preparing mirror concrete according to any one of claims 1 to 7, characterized in that: The preparation method of the mirror concrete comprises the following steps: adding cement, fly ash, fine aggregate and coarse aggregate into a blender and stirring to mix; then adding 50-60% of the water in the raw materials; stirring for 2-3 minutes; then adding a polycarboxylate water reducer, an admixture, a carboxyl-modified silane, a modified ferrocene and all the remaining water in the raw materials into the system; continuing to stir for 2-3 minutes; pouring and vibrating to compact the mixture; removing the formwork 48 hours after the pouring is completed; after the formwork is removed, sprinkling water on the surface of the test piece to ensure that the surface is fully moistened; then covering it with a transparent film for sealing and curing; after curing for 28 days, wiping the surface dry, placing the sample in an oven at 50° C. for drying for 48 hours, and coating the sample with a water-soluble acrylic resin after cooling to room temperature to obtain the mirror concrete.

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