Mirror concrete and preparation method thereof

Abstract

The present invention discloses a mirror-finish concrete and a preparation method thereof, comprising the following components by weight: 380-430 parts of cement, 40-90 parts of dust ash, 550-650 parts of tailings sand, 70-140 parts of slag, 970-1090 parts of coarse aggregate, 144-152 parts of water, 4-10 parts of mirror-finish concrete additives, 5-8 parts of jute fiber, 2-5 parts of water-reducing agent, and 2-6 parts of water-based photoinitiator. The present invention uniformly distributes the gel and crystals produced by the hydration of the cement paste on the concrete surface, thereby achieving a mirror-finish appearance quality based on gloss and smoothness. Furthermore, the additives are used to improve the appearance of the mirror-finish concrete and enhance its strength, surface hardness, and wear resistance.

Description

Technical Field

[0001] The invention relates to mirror concrete and a preparation method thereof, and belongs to the technical field of concrete building materials. Background Art

[0002] Mirror concrete, cast in a single cast-in-place process without any external decoration, utilizes the natural finish of cast-in-place concrete for a mirror-like finish. Due to its low cost, high visual quality, and environmental friendliness, it is increasingly being used in the construction industry. It is the most advanced form of concrete, showcasing a fundamental aesthetic and embodying the aesthetic of a "plain and simple" aesthetic. Mirror concrete not only significantly improves structural safety, mechanical properties, and service life, but also prevents the risk of cracking and delamination of the decorative layer later in life, reducing the economic costs of secondary decoration due to cosmetic requirements.

[0003] Concrete mix properties and the level of control over concrete placement are two key factors influencing the quality of mirrored concrete. Regarding the concrete itself, mirrored concrete primarily requires addressing two technical challenges: improving concrete's crack resistance and enhancing its surface quality. Domestic research on mirrored concrete has largely focused on the development and improvement of formwork, with limited research on the concrete itself.

[0004] CN112551937A discloses a composite admixture for clear-faced concrete, clear-faced concrete, and a method for preparing the clear-faced concrete. The admixture includes ammonium polyacryloyldimethyltaurate, polyvinyl alcohol fiber, and a sulfamate water reducer. The clear-faced concrete, composed of the composite admixture, sand, gravel, cement, fly ash, water, and zeolite powder, helps improve the crack resistance of the clear-faced concrete, but has little effect on the concrete's appearance.

[0005] CN115838270A discloses a lightweight, marble-like mirror concrete and its preparation method. The marble-like lightweight mirror concrete comprises cement, modified diatom mud, fly ash, silica fume, buoyant beads, an expansive agent, coarse aggregate, fine aggregate, water, and a polycarboxylic acid high-performance water-reducing agent. This concrete effectively addresses the problem of high apparent density by reducing its apparent density, achieving a lightweight effect. It also enhances the concrete's surface texture and durability, improving its surface density, color uniformity, and smoothness. However, its appearance resembles marble, with a dark, darker color.

[0006] CN113493335A provides a method for preparing early-strength mirror-finish concrete for composite formwork shear walls. The method comprises a cementitious material, an early-strength agent, a polycarboxylate water-reducing agent, sand and gravel, and water. The method produces early-strength mirror-finish concrete for composite formwork shear walls that has a short setting time, high early strength, and a smooth surface. While the defoaming function of the water-reducing agent is utilized to achieve a smooth surface, it does not yet achieve a mirror-like finish.

[0007] Therefore, it is necessary to develop an additive for mirror concrete, mirror concrete and its preparation method that can make the appearance quality of concrete achieve a mirror effect on the basis of glossiness and flatness, which is the key to solving the above technical problems. Summary of the Invention

[0008] In view of the many defects and shortcomings in the above-mentioned background technology, the present invention has made improvements and innovations thereto, with the aim of evenly distributing the gel and crystals produced by the hydration of cement paste on the surface of concrete, thereby achieving a mirror-like effect in terms of glossiness and flatness in the appearance of the concrete.

[0009] Another object of the present invention is to provide a mirror concrete and a preparation method thereof, using additives to improve the appearance problems of the mirror concrete, while improving the strength, surface hardness and wear resistance of the mirror concrete.

[0010] Another object of the present invention is that the mirror concrete prepared by the present invention utilizes dust removal ash, tailings sand, and slag to reduce the apparent density of the concrete, improve the apparent density of the concrete, and at the same time reduce the color difference problem of the mirror concrete.

[0011] In order to solve the above problems and achieve the above objectives of the invention, the present invention provides a mirror concrete and a preparation method thereof by adopting the following design structure and the following technical solutions:

[0012] A mirror concrete comprising the following components in parts by weight:

[0013] 380-430 parts of cement, 40-90 parts of dust ash, 550-650 parts of tailings sand, 70-140 parts of slag, 970-1090 parts of coarse aggregate, 144-152 parts of water, 4-10 parts of mirror concrete additive, 5-8 parts of jute fiber, 2-5 parts of water reducer, and 2-6 parts of water-based photoinitiator.

[0014] Preferably, the cement is ordinary Portland cement P.O42.5;

[0015] The dust removal ash has a fineness within the range of 150 meshes to 200 meshes, and is mainly composed of 72.1% to 76.0% calcium oxide, 13.2% to 14.3% silicon oxide, 3.9% to 4.2% aluminum oxide, and 2.9% to 3.8% iron oxide.

[0016] Preferably, the tailings sand fineness modulus is 2.6;

[0017] The water slag is waste slag produced by cold extraction in a smelter, and has a fineness modulus of 2.2.

[0018] Preferably, the coarse aggregate is pebbles or crushed stones with a particle size of 5 to 20 mm and good continuous grading.

[0019] Preferably, the water reducer is a polycarboxylic acid water reducer with a solid content of ≥40% and a water reduction rate of ≥30%.

[0020] Preferably, the water-based photoinitiator is a mixture of one or more of 2-hydroxy-2-methylpropiophenone, 2-hydroxy-4-(2-hydroxyethoxy)-2-methylpropiophenone, 1-hydroxycyclohexyl phenyl ketone, and benzoin isobutyl ether.

[0021] Preferably, the mirror concrete additive is also included, and the mirror concrete additive is a common additive or a special mirror concrete additive, wherein the mirror concrete additive includes the following components in parts by weight:

[0022] 105-120 parts of hydroxypropyl acrylate, 30-40 parts of ethylene glycol dimethacrylate, 90-115 parts of methyl methacrylate, 0.8-1.2 parts of amino-modified single-walled carbon nanotubes, 10-12 parts of ethylene glycol distearate, 3-6 parts of phenylpyrazoline derivatives, 18-20 parts of polyglycerol-10, 10-20 parts of NP-10, 20-30 parts of fluorocarbon nonionic surfactant, 3-8 parts of 2,4-diphenyl-4-methyl-1-pentene, 3-6 parts of hydrogen peroxide, 0.2-1 part of ferrous sulfate, and 620-707 parts of water.

[0023] Preferably, the phenylpyrazoline derivative is a mixture of one or more of 1-(4-dimethylaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline, 5-phenyl-1-(4-dimethylaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline, and 1-(4-diethanolaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline.

[0024] Preferably, the preparation method of the additive for mirror concrete comprises the following steps:

[0025] S1. Dissolve a fluorocarbon nonionic surfactant in water at room temperature, then add ethylene glycol distearate, a phenylpyrazoline derivative, and polyglycerol-10 in sequence. Heat to 60°C, stir for 120 minutes, and cool to room temperature to obtain solution A, wherein the mass of water is 2-4 times the total mass of the above four substances.

[0026] S2, under normal temperature and stirring conditions, add hydroxypropyl acrylate, ethylene glycol dimethacrylate, methyl methacrylate, water, 2,4-diphenyl-4-methyl-1-pentene, hydrogen peroxide, and ferrous sulfate to a reaction kettle, stir for 30 minutes, then stop stirring, raise the temperature to 40°C, let it stand for 3 hours, cool to room temperature, add amino-modified single-walled carbon nanotubes, and stir for 30 minutes to obtain solution B, wherein the mass of water is 1-3 times the total mass of the above five substances;

[0027] S3. Under normal temperature and stirring conditions, slowly add liquid A and NP-10 into liquid B and stir for 30 minutes to obtain the additive for mirror concrete.

[0028] Preferably, a method for preparing mirror concrete is characterized in that the method comprises the following steps:

[0029] (1) Mixing cement, dust ash, tailings sand, slag and coarse aggregate to obtain a dry mix;

[0030] (2) The dry mix is ​​mixed with a mirror concrete additive, jute fiber, a water-reducing agent, a water-based photoinitiator, and water, and then stirred for 60 to 120 seconds to obtain mirror concrete.

[0031] The beneficial effects of the present invention compared with the prior art are:

[0032] (1) The surface of the mirror concrete component prepared by the present invention has a mirror effect, is solid inside and bright outside, and has consistent color, which can achieve decoration-free delivery and save construction investment;

[0033] (2) The mirror concrete prepared by the present invention uses dust removal ash, tailings sand, and slag as raw materials, which improves the apparent density of concrete and reduces the color difference problem of mirror concrete. At the same time, the effective utilization of industrial waste residue reduces the production cost of mirror concrete;

[0034] (3) The mirrored concrete component prepared by the present invention is grayish white in color, which facilitates the subsequent color adjustment, shaping and other artistic treatments of the concrete surface;

[0035] (4) The additive for mirror concrete prepared by the present invention has a strong adsorption and dispersion effect on cement, so that the gel and crystals produced by the hydration of cement slurry are distributed as much as possible on the concrete surface, thereby improving the brightness, smoothness and wear resistance of the mirror concrete surface;

[0036] (5) The mirror concrete prepared by the present invention has good workability and tensile strength, improves the interfacial bonding strength, avoids the generation of weak areas, and improves the overall performance of the mirror concrete. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the technical solutions of the present invention are further described in detail below in conjunction with specific embodiments. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict. The present invention will be described in detail below in conjunction with embodiments.

[0038] A mirror concrete comprising the following components in parts by weight:

[0039] 380-430 parts of cement, 40-90 parts of dust ash, 550-650 parts of tailings sand, 70-140 parts of slag, 970-1090 parts of coarse aggregate, 144-152 parts of water, 4-10 parts of mirror concrete additive, 5-8 parts of jute fiber, 2-5 parts of water reducer, and 2-6 parts of water-based photoinitiator.

[0040] In the present invention, jute fiber has strong specific strength and specific modulus, and enhances the apparent density and strength of concrete through its low-density characteristics, but its bonding strength or synergistic effect with the cement matrix is ​​limited. Under the irradiation of sunlight, the water-based photoinitiator can trigger the interaction between jute fiber and the mirror concrete additive and water reducer, thereby synergistically improving the surface texture and durability of the concrete, thereby improving the surface density, color uniformity and smoothness of the concrete.

[0041] Further, the cement is ordinary Portland cement P.O42.5;

[0042] The dust removal ash has a fineness within the range of 150 meshes to 200 meshes, and is mainly composed of 72.1% to 76.0% calcium oxide, 13.2% to 14.3% silicon oxide, 3.9% to 4.2% aluminum oxide, and 2.9% to 3.8% iron oxide.

[0043] Furthermore, the fineness modulus of tailings sand is 2.6;

[0044] The water slag is waste slag produced by cold extraction in a smelter, and has a fineness modulus of 2.2.

[0045] In the present invention, the dust, tailings, and slag are all gray, essentially the same color as cement, reducing the color difference problem of mirrored concrete. Furthermore, the dust, tailings, and slag are all lightweight materials, which reduces the apparent density of concrete. During the concrete forming process, the lightweight slurry is more easily evenly distributed on the concrete surface.

[0046] Furthermore, the coarse aggregate is selected from pebbles or crushed stones with a particle size of 5 to 20 mm and good continuous grading.

[0047] Furthermore, the water reducing agent is a polycarboxylic acid water reducing agent with a solid content of ≥40% and a water reduction rate of ≥30%.

[0048] Furthermore, the water-based photoinitiator is a mixture of one or more of 2-hydroxy-2-methylpropiophenone, 2-hydroxy-4-(2-hydroxyethoxy)-2-methylpropiophenone, 1-hydroxycyclohexyl phenyl ketone, and benzoin isobutyl ether.

[0049] Furthermore, the invention also includes an additive for mirror concrete, which is a common additive or a special additive for mirror concrete, wherein the additive for mirror concrete includes the following components in parts by weight:

[0050] 105-120 parts of hydroxypropyl acrylate, 30-40 parts of ethylene glycol dimethacrylate, 90-115 parts of methyl methacrylate, 0.8-1.2 parts of amino-modified single-walled carbon nanotubes, 10-12 parts of ethylene glycol distearate, 3-6 parts of phenylpyrazoline derivatives, 18-20 parts of polyglycerol-10, 10-20 parts of NP-10, 20-30 parts of fluorocarbon nonionic surfactant, 3-8 parts of 2,4-diphenyl-4-methyl-1-pentene, 3-6 parts of hydrogen peroxide, 0.2-1 part of ferrous sulfate, and 620-707 parts of water.

[0051] In the present invention, the fluorocarbon nonionic surfactant is DuPont FS-3100.

[0052] Further, the phenylpyrazoline derivative is a mixture of one or more of 1-(4-dimethylaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline, 5-phenyl-1-(4-dimethylaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline, and 1-(4-diethanolaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline.

[0053] Furthermore, the preparation method of the additive for mirror concrete comprises the following steps:

[0054] S1. Dissolve a fluorocarbon nonionic surfactant in water at room temperature, then add ethylene glycol distearate, a phenylpyrazoline derivative, and polyglycerol-10 in sequence. Heat to 60°C, stir for 120 minutes, and cool to room temperature to obtain solution A, wherein the mass of water is 2-4 times the total mass of the above four substances.

[0055] S2, under normal temperature and stirring conditions, add hydroxypropyl acrylate, ethylene glycol dimethacrylate, methyl methacrylate, water, 2,4-diphenyl-4-methyl-1-pentene, hydrogen peroxide, and ferrous sulfate to a reaction kettle, stir for 30 minutes, then stop stirring, raise the temperature to 40°C, let it stand for 3 hours, cool to room temperature, add amino-modified single-walled carbon nanotubes, and stir for 30 minutes to obtain solution B, wherein the mass of water is 1-3 times the total mass of the above five substances;

[0056] S3. Under normal temperature and stirring conditions, slowly add liquid A and NP-10 into liquid B and stir for 30 minutes to obtain the additive for mirror concrete.

[0057] Furthermore, a method for preparing mirror concrete is characterized in that the method comprises the following steps:

[0058] (1) Mixing cement, dust ash, tailings sand, slag and coarse aggregate to obtain a dry mix;

[0059] (2) The dry mix is ​​mixed with a mirror concrete additive, jute fiber, a water-reducing agent, a water-based photoinitiator, and water, and then stirred for 60 to 120 seconds to obtain mirror concrete.

[0060] In summary, a more specific embodiment of the present invention is:

[0061] Example 1

[0062] This embodiment provides a method for preparing mirror concrete, and the specific steps are as follows:

[0063] Preparation of additives for mirror concrete:

[0064] S1. Dissolve 20 g of DuPont FS-3100 in 145 g of water at room temperature, then add 10 g of ethylene glycol distearate, 6 g of 1-(4-dimethylaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline, and 19 g of polyglycerol-10 in sequence. Heat to 60°C, stir for 120 min, and cool to room temperature to obtain Solution A.

[0065] S2, under normal temperature and stirring conditions, add 120g of hydroxypropyl acrylate, 30g of ethylene glycol dimethacrylate, 102g of methyl methacrylate, 516g of water, 8g of 2,4-diphenyl-4-methyl-1-pentene, 3g of hydrogen peroxide, and 0.6g of ferrous sulfate to a reaction kettle, stir for 30min, then stop stirring, raise the temperature to 40°C, let it stand for 3h, cool to room temperature, add 0.8g of amino-modified single-walled carbon nanotubes, and stir for 30min to obtain solution B;

[0066] S3. At room temperature and under stirring conditions, slowly add liquid A and 20g NP-10 into liquid B and stir for 30 minutes to obtain additive ZJ-1 for mirror concrete.

[0067] Mirror concrete preparation method:

[0068] 380 parts of cement, 90 parts of dust ash, 650 g of tailings sand, 70 g of slag, and 1040 parts of crushed stone were mixed to obtain a dry mix; the dry mix was then mixed with 7 parts of additive ZJ-1, 8 parts of jute fiber, 3 parts of water reducer, 2 parts of 2-hydroxy-2-methylpropiophenone, and 150 parts of water, and then stirred for 60 seconds to obtain mirror concrete.

[0069] Example 2

[0070] This embodiment provides a method for preparing mirror concrete, and the specific steps are as follows:

[0071] Preparation of additives for mirror concrete:

[0072] S1. At room temperature, dissolve 30 g of DuPont FS-3100 in 160 g of water, then add 12 g of ethylene glycol distearate, 3 g of 5-phenyl-1-(4-dimethylaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline, and 20 g of polyglycerol-10 in sequence. Heat to 60°C, stir for 120 min, and cool to room temperature to obtain Solution A.

[0073] S2, under normal temperature and stirring conditions, add 105 g of hydroxypropyl acrylate, 40 g of ethylene glycol dimethacrylate, 90 g of methyl methacrylate, 520 g of water, 3 g of 2,4-diphenyl-4-methyl-1-pentene, 4.5 g of hydrogen peroxide, and 1 g of ferrous sulfate to a reaction kettle, stir for 30 min, then stop stirring, raise the temperature to 40°C, let it react for 3 h, cool to room temperature, add 1.2 g of amino-modified single-walled carbon nanotubes, and stir for 30 min to obtain solution B;

[0074] S3. At room temperature and stirring conditions, slowly add liquid A and 10g NP-10 into liquid B, and stir for 30 minutes to obtain additive ZJ-2 for mirror concrete.

[0075] Mirror concrete preparation method:

[0076] 430 parts of cement, 40 parts of dust ash, 550 g of tailings sand, 140 g of slag, and 1070 parts of pebbles were mixed to obtain a dry mix; the dry mix was then mixed with 4 parts of additive ZJ-2, 7 parts of jute fiber, 5 parts of water reducer, 4 parts of 2-hydroxy-4-(2-hydroxyethoxy)-2-methylpropiophenone, and 150 parts of water, and then stirred for 120 seconds to obtain mirror concrete.

[0077] Example 3

[0078] This embodiment provides a method for preparing mirror concrete, and the specific steps are as follows:

[0079] Preparation of additives for mirror concrete:

[0080] S1. At room temperature, dissolve 25 g of DuPont FS-3100 in 180 g of water, then add 12 g of ethylene glycol distearate, 5 g of 1-(4-diethanolaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline, and 18 g of polyglycerol-10 in sequence. Heat to 60°C, stir for 120 min, and cool to room temperature to obtain Solution A.

[0081] S2, under normal temperature and stirring conditions, add 120g of hydroxypropyl acrylate, 40g of ethylene glycol dimethacrylate, 90g of methyl methacrylate, 483g of water, 5g of 2,4-diphenyl-4-methyl-1-pentene, 6g of hydrogen peroxide, and 0.2g of ferrous sulfate to a reaction kettle, stir for 30min, then stop stirring, raise the temperature to 40°C, let it stand for 3h, cool to room temperature, add 1g of amino-modified single-walled carbon nanotubes, and stir for 30min to obtain solution B;

[0082] S3. At room temperature and stirring conditions, liquid A and 15 g NP-10 were slowly added to liquid B, and stirred for 30 min to obtain additive ZJ-3 for mirror concrete.

[0083] Mirror concrete preparation method:

[0084] 405 parts of cement, 65 parts of dust ash, 600 g of tailings sand, 120 g of slag, 1000 parts of crushed stone, and 40 parts of pebbles were mixed to obtain a dry mix; the dry mix was then mixed with 10 parts of additive ZJ-3, 5 parts of jute fiber, 5 parts of water reducer, 6 parts of benzoin isobutyl ether, and 144 parts of water, and then stirred for 80 seconds to obtain mirror concrete.

[0085] Example 4

[0086] This embodiment provides a method for preparing mirror concrete, and the specific steps are as follows:

[0087] Preparation of additives for mirror concrete:

[0088] S1. At room temperature, 30g of DuPont FS-3100 was dissolved in 200g of water, followed by the addition of 11g of ethylene glycol distearate, 3g of 1-(4-dimethylaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline, 3g of 1-(4-diethanolaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline, and 20g of polyglycerol-10. The mixture was heated to 60°C, stirred for 120min, and then cooled to room temperature to obtain Solution A.

[0089] S2, under normal temperature and stirring conditions, add 110 g of hydroxypropyl acrylate, 35 g of ethylene glycol dimethacrylate, 100 g of methyl methacrylate, 455 g of water, 8 g of 2,4-diphenyl-4-methyl-1-pentene, 3 g of hydrogen peroxide, and 0.8 g of ferrous sulfate to a reaction kettle, stir for 30 min, then stop stirring, raise the temperature to 40°C, let it react for 3 h, cool to room temperature, add 1 g of amino-modified single-walled carbon nanotubes, and stir for 30 min to obtain solution B;

[0090] S3. At room temperature and stirring conditions, slowly add liquid A and 20g NP-10 into liquid B, and stir for 30 minutes to obtain additive ZJ-4 for mirror concrete.

[0091] Mirror concrete preparation method:

[0092] 405 parts of cement, 90 parts of dust removal ash, 576 g of tailings sand, 140 g of slag, and 1020 parts of crushed stone were mixed to obtain a dry mix; the dry mix was then mixed with 7 parts of additive ZJ-4, 5 parts of jute fiber, 2 parts of water reducer, 3 parts of 1-hydroxycyclohexyl phenyl ketone, 3 parts of benzoin isobutyl ketone, and 149 parts of water, and then stirred for 80 seconds to obtain mirror concrete.

[0093] Example 5

[0094] This embodiment provides a method for preparing mirror concrete, and the specific steps are as follows:

[0095] Preparation of additives for mirror concrete:

[0096] S1. At room temperature, 20 g of DuPont FS-3100 was dissolved in 108 g of water. Then, 10 g of ethylene glycol distearate, 4 g of 1-(4-diethanolaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline, and 18 g of polyglycerol-10 were added in sequence. The mixture was heated to 60°C, stirred for 120 min, and cooled to room temperature to obtain Solution A.

[0097] S2, under normal temperature and stirring conditions, add 120g of hydroxypropyl acrylate, 30g of ethylene glycol dimethacrylate, 115g of methyl methacrylate, 548g of water, 5g of 2,4-diphenyl-4-methyl-1-pentene, 3g of hydrogen peroxide, and 0.4g of ferrous sulfate to a reaction kettle, stir for 30min, then stop stirring, raise the temperature to 40°C, let it stand for 3h, cool to room temperature, add 1.2g of amino-modified single-walled carbon nanotubes, and stir for 30min to obtain solution B;

[0098] S3. At room temperature and stirring conditions, slowly add liquid A and 18 g NP-10 into liquid B, and stir for 30 minutes to obtain additive ZJ-5 for mirror concrete.

[0099] Mirror concrete preparation method:

[0100] 420 parts of cement, 70 parts of dust removal ash, 575 g of tailings sand, 80 g of slag, and 1090 parts of crushed stone were mixed to obtain a dry mix; the dry mix was then mixed with 5 parts of additive ZJ-5, 8 parts of jute fiber, 2 parts of water reducer, 3 parts of 1-hydroxycyclohexyl phenyl ketone, 3 parts of benzoin isobutyl, and 144 parts of water, and then stirred for 80 seconds to obtain mirror concrete.

[0101] Comparative Example 1

[0102] This embodiment provides a mirror concrete. Compared with embodiment 1, no mirror concrete additive is added:

[0103] 380 parts of cement, 90 parts of dust ash, 650 parts of tailings sand, 70 parts of slag, 1040 parts of crushed stone, 150 parts of water, 8 parts of jute fiber, 3 parts of water reducer, and 2 parts of 2-hydroxy-2-methylpropiophenone.

[0104] Comparative Example 2

[0105] This embodiment provides a mirror concrete, which, compared with embodiment 1, does not include jute fiber:

[0106] 380 parts of cement, 90 parts of dust ash, 650 parts of tailings sand, 70 parts of slag, 1040 parts of crushed stone, 150 parts of water, 7 parts of ZJ-1, 3 parts of water reducer, and 2 parts of 2-hydroxy-2-methylpropiophenone.

[0107] Comparative Example 3

[0108] This embodiment provides a mirror concrete. Compared with Example 1, no photoinitiator is added:

[0109] 380 parts of cement, 90 parts of dust ash, 650 parts of tailings sand, 70 parts of slag, 1040 parts of crushed stone, 150 parts of water, 7 parts of ZJ-1, 8 parts of jute fiber, and 3 parts of water reducer.

[0110] Comparative Example 4

[0111] This embodiment provides a mirror concrete. Compared with Example 1, the dust ash is replaced by primary fly ash:

[0112] 380 parts of cement, 90 parts of fly ash, 650 parts of tailings sand, 70 parts of slag, 1040 parts of crushed stone, 150 parts of water, 7 parts of ZJ-1, 8 parts of jute fiber, 3 parts of water reducer, and 2 parts of 2-hydroxy-2-methylpropiophenone.

[0113] Comparative Example 5

[0114] This embodiment provides a mirror concrete. Compared with Example 1, machine-made sand with the same fineness modulus is used to replace tailings sand and slag:

[0115] 380 parts of cement, 90 parts of dust ash, 720 parts of machine-made sand, 1040 parts of crushed stone, 150 parts of water, 7 parts of ZJ-17, 8 parts of jute fiber, 3 parts of water reducer, and 2 parts of 2-hydroxy-2-methylpropiophenone.

[0116] Comparative Example 6

[0117] This embodiment provides a mirror concrete:

[0118] 380 parts of cement, 90 parts of dust ash, 650 g of tailings sand, 70 g of slag, and 1040 parts of crushed stone were mixed to obtain a dry mix; the dry mix was then mixed with 20 parts of additive ZJ-1, 8 parts of jute fiber, 3 parts of water reducer, 2 parts of 2-hydroxy-2-methylpropiophenone, and 150 parts of water, and then stirred for 60 seconds to obtain mirror concrete.

[0119] Comparative Example 7

[0120] 380 parts of cement, 90 parts of dust ash, 650 g of tailings sand, 70 g of slag, and 1040 parts of crushed stone were mixed to obtain a dry mix; the dry mix was then mixed with 7 parts of additive ZJ-1, 15 parts of jute fiber, 3 parts of water reducer, 2 parts of 2-hydroxy-2-methylpropiophenone, and 150 parts of water, and then stirred for 60 seconds to obtain mirror concrete.

[0121] Comparative Example 8

[0122] This embodiment provides a mirror concrete:

[0123] 380 parts of cement, 90 parts of dust ash, 650 g of tailings sand, 70 g of slag, and 1040 parts of crushed stone were mixed to obtain a dry mix; the dry mix was then mixed with 7 parts of additive ZJ-1, 8 parts of jute fiber, 3 parts of water reducer, 0.6 parts of 2-hydroxy-2-methylpropiophenone, and 150 parts of water, and then stirred for 60 seconds to obtain mirror concrete.

[0124] Comparative Example 9

[0125] This embodiment provides a mirror concrete:

[0126] 350 parts of cement, 120 parts of dust ash, 500 g of tailings sand, 220 g of slag, and 1040 parts of crushed stone were mixed to obtain a dry mix; the dry mix was then mixed with 7 parts of additive ZJ-1, 8 parts of jute fiber, 3 parts of water reducer, 2 parts of 2-hydroxy-2-methylpropiophenone, and 150 parts of water, and then stirred for 60 seconds to obtain mirror concrete.

[0127] Compressive strength tests were conducted in accordance with GB / T50081-2002, "Standard Test Methods for Mechanical Properties of Ordinary Concrete." Rebound tests were conducted on concrete specimens using a standard rebound hammer, in accordance with JGJ / T 232-2011, "Technical Specification for Testing Concrete Compressive Strength by Rebound Method." Splitting tensile strength tests were conducted in accordance with GB / T50081-2002, "Standard Test Methods for Mechanical Properties of Ordinary Concrete." Gloss testing was conducted on the concrete specimens using an 85° low-gloss meter, in accordance with GB / T 9754. The test results are shown in Table 1.

[0128]

[0129] The data from Examples 1-5 demonstrate that the mirrored concrete prepared by the present invention exhibits high compressive strength, high surface strength, uniform apparent color, good gloss, and smoothness. Comparison of Comparative Example 1 with Example 1 demonstrates that mirrored concrete additives can enhance concrete strength, surface strength, and surface gloss. Comparison of Comparative Example 2 with Example 1 demonstrates that jute fiber can enhance concrete strength. Comparison of Comparative Example 3 with Example 1 demonstrates that photoinitiators can enhance the interaction of jute fiber with mirrored concrete additives and water-reducing agents by initiating polymerization, thereby increasing the splitting tensile strength of concrete, thereby improving its flexibility. Comparison of Comparative Example 4 with Example 1 demonstrates that fly ash can cause uneven distribution of cementation and hydration products, affecting the mirrored finish of concrete, while dust removal ash helps maintain gloss and reduce color variation. Comparison of Comparative Example 5 with Example 1 demonstrates that while concrete prepared with manufactured sand has higher strength than those made with tailings sand and slag, due to its high density, the surface strength of the concrete is inferior to those made with tailings sand and slag, and color variation is also a concern.

[0130] In order to verify the effects of the mirror concrete ingredients and components of the present invention, comparative examples 6 to 9 were designed and synthesized, and concrete performance tests were carried out in accordance with GB / T 50080-2016 "Standard for Test Methods for Performance of Ordinary Concrete Mixtures".

[0131]

[0132] The data in the table above show that:

[0133] The data from Example 1, Comparative Examples 1, and 6 demonstrate that the mirror concrete additive can improve concrete workability and enhance concrete strength, surface strength, and surface gloss. However, exceeding a certain dosage (4 to 10 parts of mirror concrete additive) can affect concrete strength, likely due to the inability to eliminate the surfactant in the additive in a timely manner.

[0134] The data of Example 1, Comparative Examples 2 and 7 show that jute fiber can improve the workability of concrete and increase the compressive and splitting strengths of concrete. However, when the dosage exceeds a certain level (5 to 8 parts of jute fiber), the concrete will become sticky and its fluidity will deteriorate.

[0135] The data of Example 1 and Comparative Examples 3 and 8 show that photoinitiators can improve the flexibility of concrete, but too low a dosage (2 to 6 parts of water-based photoinitiator) will result in insignificant performance.

[0136] The data of Example 1 and Comparative Example 9 show that dust ash and water slag contribute to the appearance and state of concrete, but the water requirement of dust ash is higher than that of cement, and excessive use will directly affect the mixing performance of concrete. The crushing resistance of water slag is weaker than that of machine-made sand and tailings sand, and excessive use will also directly affect the strength of concrete.

[0137] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any other limitation thereto. Any person skilled in the art may utilize the above-disclosed technical content to modify or modify the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention remain within the scope of protection of the present invention.

Claims

1. A mirror concrete, characterized in that: The composition comprises the following components in parts by weight: 380-430 parts of cement, 40-90 parts of dust ash, 550-650 parts of tailings sand, 70-140 parts of slag, 970-1090 parts of coarse aggregate, 144-152 parts of water, 4-10 parts of mirror concrete additive, 5-8 parts of jute fiber, 2-5 parts of water reducing agent, and 2-6 parts of water-based photoinitiator; Among them, it also includes an additive for mirror concrete, which includes the following components in parts by weight: 105-120 parts of hydroxypropyl acrylate, 30-40 parts of ethylene glycol dimethacrylate, 90-115 parts of methyl methacrylate, 0.8-1.2 parts of amino-modified single-walled carbon nanotubes, 10-12 parts of ethylene glycol distearate, 3-6 parts of phenylpyrazoline derivatives, 18-20 parts of polyglycerol-10, 10-20 parts of NP-10, 20-30 parts of fluorocarbon nonionic surfactant, 3-8 parts of 2,4-diphenyl-4-methyl-1-pentene, 3-6 parts of hydrogen peroxide, 0.2-1 part of ferrous sulfate, and 620-707 parts of water.

2. The mirror concrete according to claim 1, characterized in that: The cement is ordinary Portland cement P.O42.5; The dust removal ash has a fineness within the range of 150 meshes to 200 meshes, and is mainly composed of 72.1% to 76.0% calcium oxide, 13.2% to 14.3% silicon oxide, 3.9% to 4.2% aluminum oxide, and 2.9% to 3.8% iron oxide.

3. The mirror concrete according to claim 1, characterized in that: The tailings sand fineness modulus is 2.6; The water slag is waste slag produced by cold extraction in a smelter, and has a fineness modulus of 2.

2.

4. The mirror concrete according to claim 1, characterized in that: The coarse aggregate is selected from pebbles or crushed stones with a particle size of 5 to 20 mm and good continuous grading.

5. The mirror concrete according to claim 1, characterized in that: The water reducing agent is a polycarboxylic acid water reducing agent with a solid content of ≥40% and a water reducing rate of ≥30%.

6. The mirror concrete according to claim 1, characterized in that: The water-based photoinitiator is a mixture of one or more of 2-hydroxy-2-methylpropiophenone, 2-hydroxy-4-(2-hydroxyethoxy)-2-methylpropiophenone, 1-hydroxycyclohexyl phenyl ketone, and benzoin isobutyl ether.

7. The mirror concrete according to claim 1, characterized in that: The phenylpyrazoline derivative is a mixture of one or more of 1-(4-dimethylaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline, 5-phenyl-1-(4-dimethylaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline, and 1-(4-diethanolaminoethylsulfonylphenyl)-3-(4-chlorophenyl)-2-pyrazoline.

8. A method for preparing mirror concrete according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: (1) Mixing cement, dust ash, tailings sand, slag and coarse aggregate to obtain a dry mix; (2) The dry mix is ​​mixed with a mirror concrete additive, jute fiber, a water-reducing agent, a water-based photoinitiator, and water, and then stirred for 60 to 120 seconds to obtain mirror concrete.

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