Fair-faced concrete and its preparation method

Abstract

This application relates to the field of concrete technology, specifically disclosing a fair-faced concrete and its preparation method. The raw materials for fair-faced concrete include cement, fly ash, mineral powder, glass powder, sand, reinforcing coarse aggregate, water, water-reducing agent, defoamer, and pumping agent; the preparation method is as follows: (1) cement, fly ash, mineral powder, glass powder, sand, and reinforcing coarse aggregate are added to a mixer and mixed evenly; (2) water, water-reducing agent, defoamer, and pumping agent are added to the mixer and mixed evenly to obtain fair-faced concrete. The fair-faced concrete of this application has the characteristics of high strength and high fluidity. Therefore, the vibration step is omitted during the construction and pouring process, greatly shortening the construction cycle, reducing the possibility of operational errors, and reducing rework costs.

Description

Technical Field

[0001] This application relates to the field of concrete technology, and more specifically, to a fair-faced concrete and a method for preparing the same. Background Technology

[0002] Fair-faced concrete (also known as as-cast finish concrete or bare concrete) is named for its highly decorative effect. It is cast in one piece without any external decoration, using the natural surface of the cast concrete as the finish. Therefore, unlike ordinary concrete, it has a smooth, even surface, uniform color, sharp edges, and is free from damage and contamination. Only one or two layers of transparent protective agent are applied, giving it a very natural and dignified appearance. Fair-faced concrete is the highest level of expression among concrete materials, displaying a most essential beauty and embodying a "natural" taste. Fair-faced concrete possesses a simple, unadorned, and naturally stable appearance; its inherent weight and elegance are unmatched by some modern building materials. The softness, hardness, warmth, and coolness inherent in the material not only affect people's senses and spirit but also express the emotion of architecture. Therefore, architects believe that this is a noble simplicity, seemingly simple, but actually more artistic than glittering gold.

[0003] Because fair-faced concrete requires a uniform surface color with no significant color difference, the amount of cement used in fair-faced concrete is usually slightly more than that in ordinary concrete under the same strength grade, thus ensuring color consistency. Furthermore, to achieve a smoother and more delicate concrete surface during construction, vibration compaction is necessary. Fair-faced concrete itself has high process requirements, therefore the vibration process is very demanding; even a slight mistake necessitates starting over.

[0004] Therefore, fair-faced concrete in related technologies cannot achieve the effects of self-compacting and vibration-free compaction. Summary of the Invention

[0005] In order to improve the fact that fair-faced concrete cannot achieve the effects of self-compacting and vibration-free compaction in related technologies, this application provides fair-faced concrete and its preparation method.

[0006] In the first aspect, this application provides a fair-faced concrete, which adopts the following technical solution:

[0007] A type of fair-faced concrete, comprising the following raw materials in parts by weight:

[0008] 200-300 parts cement;

[0009] 50-70 parts fly ash;

[0010] 40-60 parts of mineral powder;

[0011] 30-50 parts glass powder;

[0012] 600-800 parts of sand;

[0013] 1000-1200 parts of reinforced coarse aggregate;

[0014] 150-200 parts water;

[0015] 5-10 parts of water-reducing agent;

[0016] 6-8 parts of defoamer;

[0017] 30-50 parts of pumping agent;

[0018] The pumping agent is a mixture made from polyacrylate, perfluoroalkyl polyether and polyurethane.

[0019] By adopting the above technical solution, the fair-faced concrete prepared by mixing the above raw materials has the characteristics of high strength and high fluidity. The fair-faced concrete has the characteristic of self-compacting during construction. Therefore, the vibration step is omitted during the construction and pouring process, which greatly shortens the construction cycle, reduces the possibility of operation errors, and reduces costs.

[0020] By using a mixture of polyacrylate, perfluoroalkyl polyether, and polyurethane as a pumping agent, the fluidity of concrete is improved, thereby enhancing its self-compacting properties. Polyacrylate reduces the surface tension of the liquid, thus improving its fluidity and wettability, and consequently enhancing the self-compacting properties of the concrete. Simultaneously, polyacrylate can form a thin film on the liquid surface, preventing and stabilizing foam within the concrete system, thus maintaining a smooth, flat, and uniformly colored surface for fair-faced concrete. Perfluoroalkyl polyether reduces the surface tension of the liquid, thereby improving the wettability of the liquid to the substrate, and further enhancing the self-compacting properties of the concrete. Perfluoroalkyl polyether also improves the gloss of the fair-faced concrete surface, thus improving the appearance quality of the finished product.

[0021] Because polyacrylates and perfluoroalkyl polyethers have good hydrophilicity, their addition, while improving the fluidity of concrete, also reduces its water resistance, leading to water immersion and whitening of the fair-faced concrete surface. Therefore, adding polyurethane in combination with polyacrylates and perfluoroalkyl polyethers allows the polyurethane to form a waterproof film on the concrete surface, preventing moisture penetration and thus improving its water resistance. Simultaneously, polyurethane prevents the fluorine atoms in perfluoroalkyl polyethers from decomposing under ultraviolet radiation, thereby enhancing the weather resistance of fair-faced concrete, delaying aging and fading, and extending its service life.

[0022] Optionally, the mass ratio of polyacrylate, perfluoroalkyl polyether and polyurethane in the pumping agent is 1:(0.5-1):(0.3-0.5).

[0023] By adopting the above technical solution, the pumping agent, through a reasonable ratio of polyacrylate and perfluoroalkyl polyether, can improve the fluidity and pumpability of concrete, thereby enhancing the self-compacting properties of fair-faced concrete and making it easier to pump and construct. The addition of polyurethane can enhance the bond strength and waterproofing of concrete. Simultaneously, polyurethane can prevent the fluorine atoms in perfluoroalkyl polyether from easily decomposing under ultraviolet radiation, thus improving the weather resistance of fair-faced concrete, delaying its aging and fading, and extending its service life.

[0024] Optionally, the pumping agent is prepared by adding polyacrylate, perfluoroalkyl polyether and polyurethane into a reaction vessel and stirring at 50-60°C for 2-3 hours to obtain the pumping agent.

[0025] By adopting the above technical solution, the pumping agent prepared by the above method has the advantages of stable performance and good application effect. The pumping agent prepared by this method contains polyacrylate, perfluoroalkyl polyether and polyurethane. These components can improve the pumpability and flow resistance of concrete, which is beneficial to improving the self-compacting properties of concrete, and thus improving construction efficiency and appearance quality.

[0026] Optionally, the glass powder has a particle size of 80-120 mesh.

[0027] By adopting the above technical solutions, the fine particle size of glass powder can fill the voids in concrete, increasing its density and thus enhancing its strength. The fine particles of glass powder can also make the concrete surface smoother, reducing the occurrence of air bubbles and defects, and improving the appearance quality of the concrete. Glass powder can chemically react with cement and aggregates in concrete to form more stable hydration products, improving the durability of the concrete. The addition of glass powder can improve the fluidity, plasticity, and pumpability of concrete, making it easier to construct and process. Compared with other high-performance materials, glass powder is less expensive, and its use can reduce the production cost of concrete to a certain extent.

[0028] Optionally, the coarse aggregate is a vacuum-treated reinforced coarse aggregate.

[0029] By adopting the above technical solution, vacuum treatment can improve the density and strength of coarse aggregate, which in turn helps to improve the strength and self-compacting properties of concrete.

[0030] Optionally, the method for processing the reinforced coarse aggregate is as follows:

[0031] S1. Place the stones in a vacuum environment and vacuum process for 1-2 hours;

[0032] S2. Inject atomized sodium silicate solution into the vacuum environment and continue vacuuming for 1-2 hours;

[0033] S3. Return to normal pressure, remove the stones and dry them.

[0034] By employing the above technical solution, a vacuum environment can remove gas and moisture from the surface of the aggregate, allowing for better contact between the aggregate and the sodium silicate solution. This results in a denser sodium silicate coating, improving the aggregate's strength. The sodium silicate solution can chemically react with the aggregate surface to form a dense coating, improving the interfacial properties between the aggregate and the cementitious material, thereby enhancing the self-compacting properties of the concrete. After treatment, the aggregate has a denser surface, resisting external environmental erosion and improving the durability of the concrete. Simultaneously, the high-density aggregate prevents displacement and floating during the self-leveling process of the concrete, thus ensuring a smooth and flat appearance.

[0035] Optionally, the concentration of the aerosol sodium silicate solution injected into the vacuum environment in step S2 is 20-30 wt%.

[0036] By adopting the above technical solution and treating the aggregate with a sodium silicate solution of 20-30 wt%, a uniform and dense sodium silicate coating can be formed on the surface of the aggregate, thereby effectively increasing the density of the aggregate and improving the strength and durability of the concrete.

[0037] Secondly, this application provides a method for preparing fair-faced concrete, which adopts the following technical solution:

[0038] A method for preparing fair-faced concrete includes the following steps:

[0039] (1) Add cement, fly ash, mineral powder, glass powder, sand and coarse aggregate into a mixer and mix evenly;

[0040] (2) Add water, water-reducing agent, defoamer and pumping agent to the mixer and continue to mix evenly to obtain fair water concrete.

[0041] By adopting the above technical solution, the preparation method is simple and easy to implement, and the fair-faced concrete produced can have excellent performance, with good strength, self-compacting properties and durability. The fair-faced concrete has the characteristic of self-compacting during construction, so the vibration step is omitted during the construction and pouring process, which greatly shortens the construction cycle, reduces the possibility of operation errors, and reduces costs.

[0042] In summary, this application has the following beneficial effects:

[0043] 1. This application employs a mixture of polyacrylate, perfluoroalkyl polyether, and polyurethane as a pumping agent to improve the fluidity of concrete, thereby enhancing its self-compacting properties. Polyacrylate reduces the surface tension of the liquid, thus improving its fluidity and wettability, and consequently enhancing the self-compacting properties of the concrete. Simultaneously, polyacrylate can form a thin film on the liquid surface, preventing and stabilizing foam within the concrete system, thus maintaining a smooth, flat, and uniformly colored surface for the fair-faced concrete. Perfluoroalkyl polyether reduces the surface tension of the liquid, thereby improving the wettability of the liquid to the substrate, and thus enhancing the self-compacting properties of the concrete. Perfluoroalkyl polyether also improves the gloss of the fair-faced concrete surface, thereby improving the appearance quality of the finished product. When polyurethane is used in conjunction with polyacrylate and perfluoroalkyl polyether, the polyurethane forms a waterproof film on the concrete surface, preventing moisture penetration and improving its water resistance. Furthermore, polyurethane prevents the fluorine atoms in the perfluoroalkyl polyether from easily decomposing under ultraviolet radiation, thus enhancing the weather resistance of the fair-faced concrete, delaying its aging and fading, and extending its service life.

[0044] 2. In this application, sodium silicate solution is used to vacuum treat the coarse aggregate. The vacuum environment removes gas and moisture from the surface of the stones, allowing for better contact between the stones and the sodium silicate solution, thereby forming a denser sodium silicate coating and improving the strength of the stones. The sodium silicate solution can chemically react with the stone surface to form a dense sodium silicate coating, improving the interfacial properties between the stones and cementitious materials, and thus enhancing the self-compacting properties of the concrete. After treatment, the stones have a denser surface, which resists external environmental erosion and improves the durability of the concrete. Simultaneously, the high-density stones, as aggregate, prevent displacement and floating during the self-leveling process of the concrete, thus contributing to a smooth and flat appearance.

[0045] 3. This application utilizes the addition of glass powder. The fine particle size of the glass powder can fill the voids in the concrete, increasing its density and thus enhancing its strength. The fine particles of glass powder also make the concrete surface smoother, reducing the occurrence of air bubbles and defects, and improving the appearance quality of the concrete. Glass powder can chemically react with cement and aggregates in the concrete to form more stable hydration products, improving the durability of the concrete. The addition of glass powder can improve the fluidity, plasticity, and pumpability of the concrete, making it easier to construct and process. Compared to other high-performance materials, glass powder is relatively inexpensive, and its use can reduce the production cost of concrete to a certain extent. Attached Figure Description

[0046] Figure 1This is a flowchart of the fair-faced concrete preparation method provided in this application. Detailed Implementation

[0047] The present application will be further described in detail below with reference to the embodiments.

[0048] The cement is ordinary Portland cement; the specific surface area of ​​the fly ash is 300–400 m². 2 / kg, loss on ignition not exceeding 2%; glass powder is a white transparent powder with a purity of 99.0%; mineral powder is S95 grade slag powder with a specific surface area of ​​400-450m². 2 / kg; the water-reducing agent is polycarboxylate high-efficiency water-reducing agent; the defoamer is THIX-558 industrial defoamer purchased from Yantai Hengxin Chemical Technology Co., Ltd.; the molecular weight of polyacrylate is 40,000-50,000; the molecular weight of perfluoroalkyl polyether is 1,000-2,000; and the molecular weight of polyurethane is 2,000-3,000.

[0049] Example of preparation of pumping agent

[0050] Preparation Example 1

[0051] 10 kg of polyacrylate, 10 kg of perfluoroalkyl polyether and 5 kg of polyurethane were added to a reactor and stirred at 50 °C for 2 hours to obtain a pumping agent.

[0052] Preparation Example 2

[0053] 10 kg of polyacrylate, 5 kg of perfluoroalkyl polyether and 3 kg of polyurethane were added to a reactor and stirred at 55 °C for 2.5 hours to obtain a pumping agent.

[0054] Preparation Example 3

[0055] 10 kg of polyacrylate, 8 kg of perfluoroalkyl polyether and 4 kg of polyurethane were added to a reactor and stirred at 60 °C for 3 hours to obtain a pumping agent.

[0056] Preparation Example 4

[0057] 10 kg of polyacrylate and 8 kg of perfluoroalkyl polyether were added to a reactor and stirred at 25°C for 3 hours to obtain a pumping agent.

[0058] Preparation Example 5

[0059] 10 kg of polyacrylate and 4 kg of polyurethane were added to a reactor and stirred at 60°C for 3 hours to obtain a pumping agent.

[0060] Preparation Example 6

[0061] 8 kg of perfluoroalkyl polyether and 4 kg of polyurethane were added to a reactor and stirred at 60°C for 3 hours to obtain a preparation example of pumping agent reinforced coarse aggregate.

[0062] Preparation Example 7

[0063] S1. Place the stones in a vacuum environment and vacuum process for 2 hours;

[0064] S2. Inject a 20wt% sodium silicate solution in aerosol form into the vacuum environment and continue the vacuum treatment for 2 hours.

[0065] S3. Return to normal pressure, remove the stones and dry them.

[0066] Preparation Example 8

[0067] S1. Place the stones in a vacuum environment and vacuum process for 1 hour;

[0068] S2. Inject a 25wt% sodium silicate solution in aerosol form into the vacuum environment and continue vacuuming for 1 hour.

[0069] S3. Return to normal pressure, remove the stones and dry them.

[0070] Preparation Example 9

[0071] S1. Place the stones in a vacuum environment and vacuum process for 2 hours;

[0072] S2. Inject a 30wt% sodium silicate solution in aerosol form into the vacuum environment and continue the vacuum treatment for 2 hours.

[0073] S3. Return to normal pressure, remove the stones and dry them.

[0074] Preparation Example 10

[0075] S1. Soak the stones in a 30wt% sodium silicate solution for 2 hours;

[0076] S2. Remove the stones and dry them.

[0077] Example

[0078] Example 1

[0079] A type of fair-faced concrete, the raw material composition and corresponding dosage are shown in Table 1, wherein the pumping agent is the pumping agent prepared in Preparation Example 1; the reinforcing coarse aggregate is the reinforcing coarse aggregate prepared in Preparation Example 7; and the average particle size of the glass powder is 80 mesh.

[0080] The preparation steps are as follows:

[0081] (1) Add cement, fly ash, mineral powder, glass powder, sand and coarse aggregate into a mixer and mix for 2 minutes;

[0082] (2) Add water, water-reducing agent, defoamer and pumping agent to the mixer and continue mixing for 2 minutes to obtain fair water concrete.

[0083] Example 2

[0084] A type of fair-faced concrete, the raw material composition and corresponding dosage are shown in Table 1, wherein the pumping agent is the pumping agent prepared in Preparation Example 2; the reinforcing coarse aggregate is the reinforcing coarse aggregate prepared in Preparation Example 8; and the average particle size of the glass powder is 100 mesh.

[0085] The preparation steps are as follows:

[0086] (1) Add cement, fly ash, mineral powder, glass powder, sand and coarse aggregate into a mixer and mix for 2 minutes;

[0087] (2) Add water, water-reducing agent, defoamer and pumping agent to the mixer and continue mixing for 2 minutes to obtain fair water concrete.

[0088] Example 3

[0089] A type of fair-faced concrete, the raw material composition and corresponding dosage are shown in Table 1, wherein the pumping agent is the pumping agent prepared in Preparation Example 3; the reinforcing coarse aggregate is the reinforcing coarse aggregate prepared in Preparation Example 9; and the average particle size of the glass powder is 120 mesh.

[0090] The preparation steps are as follows:

[0091] (1) Add cement, fly ash, mineral powder, glass powder, sand and coarse aggregate into a mixer and mix for 2 minutes;

[0092] (2) Add water, water-reducing agent, defoamer and pumping agent to the mixer and continue mixing for 2 minutes to obtain fair water concrete.

[0093] Table 1. Components and weights (kg) of each raw material in Examples 1-3

[0094] raw material Example 1 Example 2 Example 3 cement 20 25 30 fly ash 5 6 7 Mineral powder 4 5 6 glass powder 3 4 5 sand 60 70 80 Reinforced coarse aggregate 100 110 120 water 15 18 20 Water reducing agent 0.5 0.8 1 Defoamer 0.6 0.7 0.8 Pumping agent 3 4 5

[0095] Example 4

[0096] A type of fair-faced concrete differs from Example 3 in that the reinforcing coarse aggregate used in the raw materials is the reinforcing coarse aggregate prepared in Preparation Example 10.

[0097] Example 5

[0098] A type of fair-faced concrete differs from Example 3 in that the average particle size of the glass powder in the raw materials is 30 mesh.

[0099] Comparative Example

[0100] Comparative Example 1

[0101] The difference between this type of fair-faced concrete and Example 3 is that the pumping agent used in the raw materials is iron saponin pumping agent purchased from Shandong Hongquan Chemical Technology Co., Ltd.

[0102] Comparative Example 2

[0103] A type of fair-faced concrete differs from Example 3 in that the pumping agent used in the raw materials is the pumping agent prepared in Preparation Example 4.

[0104] Comparative Example 3

[0105] A type of fair-faced concrete differs from Example 3 in that the pumping agent used in the raw materials is the pumping agent prepared in Preparation Example 5.

[0106] Comparative Example 4

[0107] A type of fair-faced concrete differs from Example 3 in that the pumping agent used in the raw materials is the pumping agent prepared in Preparation Example 6.

[0108] Comparative Example 5

[0109] A type of fair-faced concrete differs from Example 3 in that untreated stones are used directly as coarse aggregate in the raw materials.

[0110] Performance testing

[0111] Experiment 1 Slump Test Test Samples: Fair-faced concrete obtained in Examples 1-5 was used as test sample 1-5, and fair-faced concrete obtained in Comparative Examples 1-5 was used as control sample 1-5.

[0112] Test method: A slump cone shaped like a trumpet with a top opening of 100mm, a bottom opening of 200mm, and a height of 300mm was used to fill test samples 1-5 and control samples 1-5. Each sample was filled in three stages. After each filling, a tamping hammer was used to evenly tap the cone from the outside to the inside 25 times along the wall to compact it. After tamping, the surface was smoothed. Then, the cone was lifted, and the difference between the height of the highest point of the slumped concrete and the height of the cone (300mm) was subtracted from the height of the slumped cone. The difference is the slump. The greater the slump, the stronger the fluidity and workability of the concrete, that is, the better the self-compacting performance of the concrete.

[0113] Test results: The test results of test samples 1-5 are shown in Table 2, and the test results of control samples 1-5 are shown in Table 3.

[0114] Test 2 Compressive Strength Test Samples: Fair-faced concrete obtained in Examples 1-5 was used as test sample 1-5, and fair-faced concrete obtained in Comparative Examples 1-5 was used as control sample 1-5.

[0115] Test method: Concrete blocks were made from the fair-faced concrete of test samples 1-5 and the fair-faced concrete of control samples 1-5. The 28-day compressive strength (MPa) of the concrete was tested according to the compressive strength test in GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete".

[0116] Test instrument: pressure testing machine. Test results: The test results of test samples 1-5 are shown in Table 2, and the test results of control samples 1-5 are shown in Table 3.

[0117] Table 2. Slump and compressive strength test results for test samples 1-5

[0118]

[0119] Table 3. Slump and compressive strength test results of control samples 1-5

[0120]

[0121]

[0122] As can be seen from Examples 1-3 and Comparative Example 1, along with Tables 2 and 3, the fair-faced concrete prepared in this application maintains a slump of over 180 mm, thus exhibiting good fluidity and consequently good self-compacting properties during construction. The vibration step is omitted during pouring, significantly shortening the construction cycle and reducing the possibility of operational errors. This demonstrates that the special components and proportions of the pumping agent provided in this application have a good promoting effect on the fluidity of fair-faced concrete. Comparative Example 1 uses a conventional pumping agent, resulting in a slump of only 70 mm, thus exhibiting poor fluidity and self-compacting properties, which is unsuitable for use in high-rise building construction.

[0123] Combining Example 3 and Comparative Examples 2-4 with Tables 2 and 3, it can be seen that in Example 3, the pumping agent provided in this application was used in combination with polyacrylate, perfluoroalkyl polyether, and polyurethane, and the slump of the fair-faced concrete was finally measured to be 180 mm. In Comparative Examples 2-4, the pumping agent used any two of polyacrylate, perfluoroalkyl polyether, and polyurethane, and the maximum slump of the fair-faced concrete was finally measured to be 95 mm. Therefore, it is shown that the combination of polyacrylate, perfluoroalkyl polyether, and polyurethane can enable concrete to maintain the best fluidity and self-compacting properties.

[0124] Combining Examples 3 and 4 with Table 2, it can be seen that Example 4 uses the reinforced coarse aggregate prepared in Preparation Example 10. Preparation Example 10 did not undergo vacuum treatment during processing; instead, it was directly immersed in a sodium silicate solution. Therefore, the sodium silicate could not form a dense coating, resulting in poor interfacial properties between the coarse aggregate and other cementitious materials, leading to a significant loss in the fluidity and compressive strength of the concrete. The slump of the concrete in Example 3 was 185 mm, while the slump in Example 4 decreased to 130 mm. The compressive strength of Example 3 was 51.8 MPa, while the compressive strength of Example 4 decreased to 42.9 MPa. This demonstrates that the vacuum treatment of the aggregate in this application has a relatively positive impact on maintaining the fluidity and compressive strength of the concrete.

[0125] Combining Examples 3 and 5 with Table 2, it can be seen that in Example 5, glass powder with an average particle size of 30 mesh was used. Therefore, the actual particle size of the glass powder was relatively large, resulting in insufficient filling of the gaps in the concrete and consequently a decrease in the compressive strength of the concrete. Furthermore, the large glass powder particles led to greater friction within the concrete system, thus reducing the fluidity of the concrete and significantly decreasing its spalling and self-compacting properties.

[0126] As can be seen from Example 3, Comparative Example 5, and Tables 2 and 3, since untreated stones were directly used as coarse aggregate in Comparative Example 5, the interfacial properties between the stone surface and other cementitious materials were enhanced, which led to a decrease in the fluidity and self-compacting properties of the concrete. At the same time, since a dense sodium silicate coating could not be formed, the strength of the coarse aggregate was reduced, which in turn led to a decrease in the compressive strength of the concrete.

[0127] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A type of fair-faced concrete, characterized in that, Including the following parts by weight of raw materials: 200-300 parts cement; 50-70 parts fly ash; 40-60 parts of mineral powder; 30-50 parts glass powder; 600-800 parts of sand; 1000-1200 parts of reinforced coarse aggregate; 150-200 parts water; 5-10 parts of water-reducing agent; 6-8 parts of defoamer; 30-50 parts of pumping agent; The pumping agent is a mixture of polyacrylate, perfluoroalkyl polyether and polyurethane as raw materials; the mass ratio of polyacrylate, perfluoroalkyl polyether and polyurethane in the pumping agent is 1:(0.5-1):(0.3-0.5), the molecular weight of polyacrylate is 40,000-50,000, the molecular weight of perfluoroalkyl polyether is 1,000-2,000, and the molecular weight of polyurethane is 2,000-3,000. The pumping agent is prepared by adding polyacrylate, perfluoroalkyl polyether and polyurethane into a reaction vessel and stirring at 50-60°C for 2-3 hours to obtain the pumping agent.

2. The fair-faced concrete according to claim 1, characterized in that: The glass powder has a particle size of 80-120 mesh.

3. The fair-faced concrete according to claim 1, characterized in that: The coarse aggregate is a reinforced coarse aggregate that has undergone vacuum treatment.

4. The fair-faced concrete according to claim 1, characterized in that: The method for processing the reinforced coarse aggregate is as follows: S1. Place the stones in a vacuum environment and vacuum process for 1-2 hours; S2. Inject atomized sodium silicate solution into the vacuum environment and continue vacuuming for 1-2 hours; S3. Return to normal pressure, remove the stones and dry them.

5. The fair-faced concrete according to claim 4, characterized in that: The concentration of the aerosol sodium silicate solution injected into the vacuum environment in S2 is 20-30 wt%.

6. A method for preparing fair-faced concrete as described in any one of claims 1-5, characterized in that, Includes the following steps: (1) Add cement, fly ash, mineral powder, glass powder, sand and reinforcing coarse aggregate into a mixer and mix evenly; (2) Add water, water-reducing agent, defoamer and pumping agent to the mixer and continue to mix evenly to obtain fair water concrete.

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