A construction engineering decorative pavement panel and a preparation method thereof

Abstract

The application relates to the field of road reconstruction, and particularly discloses a building engineering decorative pavement slab and a preparation method thereof. The building engineering decorative pavement slab comprises the following raw materials in parts by weight: coarse aggregate 800-1000 parts, fine aggregate 500-700 parts, cement 250-350 parts, water 150-200 parts, and polycarboxylic acid water reducing agent 5.5-7.5 parts. The coarse aggregate comprises modified coarse aggregate and gravel, the weight ratio of the modified coarse aggregate to the gravel is 1:1, and the modified coarse aggregate is prepared from modified coal-burning slag and modified ceramsite. The preparation method comprises the following steps: stirring and mixing the coarse aggregate, the fine aggregate and the cement, and then stirring and mixing the water and the polycarboxylic acid water reducing agent to obtain concrete. The building engineering decorative pavement slab can be used for road reconstruction, and has the advantages of reducing the influence of excessive water absorption of the coal-burning slag on the strength of the concrete.

Description

Technical Field

[0001] This application relates to the field of road reconstruction, and more specifically, to a decorative road panel for building engineering and its preparation method. Background Technology

[0002] With economic and social development, people's demand for and emphasis on environmental protection are increasing, making the harmless disposal and resource utilization of coal-fired boiler slag increasingly important in the industry. Coal-fired boiler slag can be used as aggregate in concrete, effectively reducing the weight of concrete, thereby reducing the self-weight of buildings and the foundation load, and improving the overall performance of buildings.

[0003] The durability of concrete is closely related to its strength. Optimizing the design of the types of concrete raw materials and the mix proportions can improve the durability of concrete.

[0004] Because the water absorption rate of coal-fired slag is generally higher than the upper limit of aggregate water absorption rate specified in concrete mixing, using coal-fired slag as aggregate will result in poor frost resistance of concrete due to the large amount of water absorbed by the coal-fired slag. Summary of the Invention

[0005] In order to reuse coal-fired furnace slag and reduce the impact of excessive water absorption by coal-fired furnace slag on the freeze-thaw resistance of concrete, this application provides a type of concrete and a method for its preparation.

[0006] In a first aspect, this application provides a type of concrete, which adopts the following technical solution:

[0007] A decorative pavement panel for building engineering comprises the following raw materials in parts by weight: 800-1000 parts coarse aggregate, 500-700 parts fine aggregate, 250-350 parts cement, 150-200 parts water, and 5.5-7.5 parts polycarboxylate superplasticizer; wherein the coarse aggregate comprises modified coarse aggregate and gravel, and the weight ratio of the modified coarse aggregate to the gravel is 1:3, and the modified coarse aggregate is prepared from modified coal slag and modified ceramsite.

[0008] By adopting the above technical solution, modified coarse aggregate is prepared by mixing modified coal slag and modified ceramsite. The modified coarse aggregate replaces some of the stones, reducing the impact on concrete strength caused by excessive use of coal slag and the resulting absorption of mixing water. At the same time, it reduces the adverse effects of coal slag on the freeze-thaw resistance of concrete.

[0009] Preferably, the modified coarse aggregate has a particle size of 5-10 mm, and the gravel has a particle size of 10-25 mm.

[0010] By adopting the above technical solution, the modified coarse aggregate can only replace the stone, and the strength of lightweight concrete can be guaranteed while the coal-fired slag base is recycled.

[0011] Preferably, the modified ceramsite includes crushed ceramsite, a modifier, and a reinforcing agent.

[0012] By adopting the above technical solution, the ceramsite is first crushed to reduce its water absorption, and then the surface of the ceramsite is modified to enhance its erosion resistance and strengthen its bond with the modified coal slag, thereby improving the structural stability of the modified coarse aggregate.

[0013] Preferably, the modifier is a silver sulfate solution, which is prepared from silver sulfate, concentrated sulfuric acid, isoamyl butyrate and anhydrous ethanol.

[0014] By adopting the above technical solution, silver sulfate solution is used to impregnate the surface of ceramsite, dissolving the unstable parts and improving the overall stability of the crushed ceramsite. When the modified ceramsite and modified coal slag are used to make modified coarse aggregate, the modified ceramsite not only serves as the internal core, but also partially embedded on the surface of the modified coarse aggregate, so that the modified coarse aggregate maintains a certain water absorption rate.

[0015] Preferably, the modified ceramsite is prepared by the following steps: immersing crushed ceramsite in a modifier for 6 hours, then removing it and immersing it in a reinforcing agent for 1 hour to obtain modified ceramsite.

[0016] By adopting the above technical solution, the internal structure of the ceramsite is exposed after crushing, thereby reducing the water storage capacity of the ceramsite. Then, by impregnating the ceramsite with a modifier, the unstable parts of the surface of the crushed ceramsite are dissolved or detached, thereby improving the overall structural stability of the crushed ceramsite. Finally, the ceramsite is reinforced with a reinforcing agent to improve the stability of the modifier on the ceramsite.

[0017] Preferably, the modified coal slag includes coal slag, wetting agent and hydrophobic agent, and the weight ratio of the coal slag, wetting agent and hydrophobic agent is 6:(2-4):1.

[0018] By adopting the above technical solution, coal-fired slag is impregnated with an impregnating agent. The internal oxides combine with the impregnating agent, and the silica forms a gel after contact with the impregnating agent. This allows the modified coal-fired slag to provide sufficient adhesion, facilitating the bonding of the impregnated coal-fired slag with the hydrophobic agent. At the same time, the gel changes the porosity of the coal-fired slag, reducing its water absorption rate. Furthermore, the combination of the hydrophobic agent and the coal-fired slag further reduces the water absorption rate of the coal-fired slag, resulting in a significant decrease in the water absorption rate of the modified coal-fired slag. This reduces the risk of insufficient water in concrete mixing due to excessive water absorption by the coal-fired slag, thus minimizing the impact on concrete performance.

[0019] Preferably, the wetting agent is a mixture of ethyl acetate and anhydrous ethanol, wherein the weight ratio of ethyl acetate to anhydrous ethanol is 1:1, and the hydrophobic agent is hydrophobic nano-titanium dioxide powder.

[0020] By adopting the above technical solution, during the impregnation process of ethyl acetate and anhydrous ethanol, silica swells into a gel-like substance. Hydrophobic nano-titanium dioxide powder combines with the gel and is then dried to become a whole, thereby transforming coal slag into modified coal slag, reducing the water absorption rate, and effectively reducing the insufficient mixing water caused by the water absorption of coal slag, thus reducing the impact on the strength of concrete.

[0021] Preferably, the modified coal slag is prepared by the following steps: crushing the coal slag to 100 mesh, mixing the wetting agent and the coal slag, adding the hydrophobic agent and mixing evenly, drying and then crushing to 50 mesh to obtain the modified coal slag.

[0022] By adopting the above technical solution, the internal components of the crushed coal slag are exposed, which facilitates the bonding of the impregnating agent. At the same time, the water storage capacity of the coal slag is reduced due to the destruction of pores caused by crushing, thereby reducing the water absorption rate of the coal slag. Furthermore, by combining the hydrophobic agent with the gelled coal slag, the water absorption rate of the coal slag is further reduced, effectively reducing the situation where excessive water absorption by the coal slag leads to a decline in concrete performance.

[0023] Preferably, the modified coarse aggregate is prepared by the following steps: mixing modified coal slag and modified ceramsite in a weight ratio of 10:(1-3) and performing disc granulation, using water glass as the binder, and sieving particles with a diameter of 5-10 mm as the modified coarse aggregate.

[0024] By adopting the above technical solution, modified coal slag that has undergone hydrophobic treatment is granulated with modified ceramsite. The modified ceramsite is embedded in the modified coarse aggregate to form a water-absorbing component, which effectively reduces the water absorption rate of the modified coarse aggregate that is too low due to the hydrophobic modification of the modified coal slag, making it unsuitable for mixing, and effectively improves the stability of concrete.

[0025] Secondly, this application provides a method for preparing concrete, employing the following technical solution:

[0026] A method for preparing decorative road slabs for building engineering includes the following steps: mixing coarse aggregate, fine aggregate and cement, then adding water and polycarboxylate superplasticizer and mixing to obtain concrete.

[0027] By adopting the above technical solution, the product can be obtained simply by mixing the raw materials. The operation is simple and the product is readily available.

[0028] In summary, this application has the following beneficial effects:

[0029] 1. Since this application uses modified coal slag as part of the raw materials, and produces modified coarse aggregate with modified ceramsite to replace part of the stone, the modified coal slag is reused.

[0030] 2. In this application, it is preferred to use an impregnating agent to gel the coal slag, and then combine it with a hydrophobic agent to improve the hydrophobicity of the coal slag and reduce its water absorption. At the same time, it is combined with modified ceramsite to form modified coarse aggregate, so as to avoid the impact of insufficient mixing water on the concrete strength due to excessive water absorption.

[0031] 3. In this application, modified ceramsite is preferred to adjust the water absorption rate of modified coarse aggregate, which effectively reduces the poor mixing performance of concrete raw materials caused by the low water absorption rate of modified coal slag after modification. Detailed Implementation

[0032] In this application, the aggregate particle size distribution is 10mm-20mm and 20mm-25mm, with a weight ratio of 2:1; the fine aggregate is natural sand with a particle size of 0.075mm-4.75mm; the cement is ordinary Portland cement PO.42.5; the ceramsite is clay ceramsite with a particle size of 10mm; the concentrated sulfuric acid is a 98% concentrated sulfuric acid solution; the hydrophobic nano-titanium dioxide powder has a particle size of 200nm; the modifier is a silver sulfate solution, specifically prepared by dissolving 5g of silver sulfate in 500mL of concentrated sulfuric acid solution, then slowly adding the concentrated sulfuric acid solution containing silver sulfate in batches to a mixed solution of 2.5L isoamyl butyrate and 2.5L anhydrous ethanol, stirring and mixing evenly to obtain the modifier; the reinforcing agent is a barium nitrate solution with a mass fraction concentration of 20%.

[0033] The present application will be further described in detail below with reference to the embodiments.

[0034] Preparation Example

[0035] Example of modified ceramsite preparation

[0036] Preparation Example 1

[0037] This preparation example provides a modified ceramsite, which is prepared by the following steps:

[0038] The ceramsite is crushed, and the crushed ceramsite with a particle size of 1-3 mm is screened and immersed in silver sulfate solution. The silver sulfate solution covers the crushed ceramsite and it is soaked for 6 hours. After soaking, it is taken out and placed in barium nitrate solution. The barium nitrate solution covers the crushed ceramsite and it is soaked for 1 hour. After soaking, it is taken out to obtain modified ceramsite.

[0039] Example of modified coal slag preparation

[0040] Preparation Example 2

[0041] This preparation example provides a modified coal-fired slag, which is prepared by the following steps: crushing the coal-fired slag to 100 mesh, mixing ethyl acetate and anhydrous ethanol in a weight ratio of 1:1 as an impregnating agent, mixing 6 kg of coal-fired slag and 2 kg of impregnating agent, adding 1 kg of hydrophobic nano-titanium dioxide powder and mixing evenly, and drying at 100°C for 2 h to obtain the modified coal-fired slag.

[0042] Preparation Example 3

[0043] This preparation example provides a modified coal-fired slag, which is prepared by the following steps: crushing the coal-fired slag to 100 mesh, mixing ethyl acetate and anhydrous ethanol in a weight ratio of 1:1 as an impregnating agent, mixing 6 kg of coal-fired slag and 3 kg of impregnating agent, adding 1 kg of hydrophobic nano-titanium dioxide powder and mixing evenly, and drying at 100°C for 2 hours to obtain the modified coal-fired slag.

[0044] Preparation Example 4

[0045] This preparation example provides a modified coal-fired slag, which is prepared by the following steps: crushing the coal-fired slag to 100 mesh, mixing ethyl acetate and anhydrous ethanol in a weight ratio of 1:1 as an impregnating agent, mixing 6 kg of coal-fired slag and 4 kg of impregnating agent, adding 1 kg of hydrophobic nano-titanium dioxide powder and mixing evenly, and drying at 100°C for 2 hours to obtain the modified coal-fired slag.

[0046] Preparation Example 5

[0047] This preparation example provides a modified coal-fired slag, which is prepared by the following steps: crushing the coal-fired slag to 100 mesh, mixing ethyl acetate and anhydrous ethanol in a weight ratio of 1:1 as an impregnating agent, mixing 6 kg of coal-fired slag and 4 kg of impregnating agent evenly, and drying at 100°C for 2 hours to obtain the modified coal-fired slag.

[0048] Preparation Example 6

[0049] This preparation example provides a modified coal-fired slag, which is prepared by the following steps: crushing the coal-fired slag to 100 mesh, mixing 6 kg of coal-fired slag and 1 kg of hydrophobic nano-titanium dioxide powder evenly, and drying at 100°C for 2 hours to obtain the modified coal-fired slag.

[0050] Example of modified coarse aggregate preparation

[0051] Preparation Example 7

[0052] This preparation example provides a modified coarse aggregate, which is prepared by the following steps:

[0053] The modified coal slag prepared in Preparation Example 2 and the modified ceramsite prepared in Preparation Example 1 were mixed at a weight ratio of 10:1 and then granulated by disc granulation. The amount added was 3% of the total weight of the coal slag and ceramsite. The binder was water glass with a mass fraction of 10%. Particles with a particle size of 5-10 mm were screened out as modified coarse aggregate.

[0054] Preparation Example 8

[0055] This preparation example provides a modified coarse aggregate, which is prepared by the following steps:

[0056] The modified coal slag prepared in Preparation Example 3 and the modified ceramsite prepared in Preparation Example 1 were mixed at a weight ratio of 10:2 and then granulated by disc granulation. The amount added was 3% of the total weight of the coal slag and ceramsite. The binder was water glass with a mass fraction of 10%. Particles with a particle size of 5-10 mm were screened out as modified coarse aggregate.

[0057] Preparation Example 9

[0058] This preparation example provides a modified coarse aggregate, which is prepared by the following steps:

[0059] The modified coal slag prepared in Preparation Example 4 and the modified ceramsite prepared in Preparation Example 1 were mixed at a weight ratio of 10:3 and then granulated by disc granulation. The amount added was 3% of the total weight of the coal slag and ceramsite. The binder was water glass with a mass fraction of 10%. Particles with a particle size of 5-10 mm were screened out as modified coarse aggregate.

[0060] Preparation Example 10

[0061] This preparation example provides a modified coarse aggregate, which is prepared by the following steps:

[0062] The modified coal slag obtained in Preparation Example 5 and the modified ceramsite obtained in Preparation Example 1 were mixed at a weight ratio of 10:2 and then granulated by disc granulation. The amount added was 3% of the total weight of the coal slag and ceramsite. The binder was water glass with a mass fraction of 10%. Particles with a particle size of 5-10 mm were screened out as modified coarse aggregate.

[0063] Preparation Example 11

[0064] This preparation example provides a modified coarse aggregate, which is prepared by the following steps:

[0065] The modified coal slag prepared in Preparation Example 6 and the modified ceramsite prepared in Preparation Example 1 were mixed at a weight ratio of 10:2 and then granulated by disc granulation. The binder was water glass with a mass fraction of 10%, and the amount added was 3% of the total weight of the coal slag and ceramsite. Particles with a particle size of 5-10 mm were screened out as modified coarse aggregate.

[0066] Preparation Example 12

[0067] This preparation example provides a modified coarse aggregate, which is prepared by the following steps:

[0068] The coal slag crushed to 100 mesh and the modified ceramsite prepared in Example 1 were mixed at a weight ratio of 10:2 and then granulated by disc granulation. The binder was water glass with a mass fraction of 10%, and the amount added was 3% of the total weight of the coal slag and ceramsite. Particles with a particle size of 5-10 mm were screened out as modified coarse aggregate.

[0069] Preparation Example 13

[0070] This preparation example provides a modified coarse aggregate, which is prepared by the following steps:

[0071] The coal slag and ceramsite prepared in Preparation Example 3 were mixed at a weight ratio of 10:2 and then granulated by disc granulation. The binder was water glass with a mass fraction of 10%, and the amount added was 3% of the total weight of the coal slag and ceramsite. Particles with a particle size of 5-10 mm were screened out as modified coarse aggregate.

[0072] Preparation Example 14

[0073] This preparation example provides a modified coarse aggregate, which is prepared by the following steps:

[0074] Coal slag crushed to 100 mesh and ceramsite are mixed at a weight ratio of 10:2 and then granulated by disc granulation. The binder is water glass with a mass fraction of 10%, which is added at 3% of the total weight of coal slag and ceramsite. Particles with a particle size of 5-10 mm are screened out as modified coarse aggregate.

[0075] Example

[0076] Example 1

[0077] This embodiment provides a type of concrete, which is prepared by the following steps:

[0078] 200 kg of modified coarse aggregate prepared in Example 7, 600 kg of gravel, 500 kg of fine aggregate and 250 kg of cement were mixed together, and then 150 kg of water and 5.5 kg of polycarboxylate superplasticizer were added and mixed together to obtain concrete.

[0079] Example 2

[0080] This embodiment provides a type of concrete, which is prepared by the following steps:

[0081] 225 kg of modified coarse aggregate prepared in Example 8, 675 kg of gravel, 600 kg of fine aggregate and 300 kg of cement were mixed together, and then 175 kg of water and 6.5 kg of polycarboxylate superplasticizer were added and mixed together to obtain concrete.

[0082] Example 3

[0083] This embodiment provides a type of concrete, which is prepared by the following steps:

[0084] 250 kg of modified coarse aggregate prepared in Example 9, 750 kg of gravel, 700 kg of fine aggregate and 350 kg of cement were mixed together, and then 250 kg of water and 7.5 kg of polycarboxylate superplasticizer were added and mixed together to obtain concrete.

[0085] Example 4

[0086] This embodiment provides a type of concrete, which is prepared by the following steps:

[0087] 225 kg of modified coarse aggregate prepared in Example 7, 675 kg of gravel, 600 kg of fine aggregate and 300 kg of cement were mixed together, and then 175 kg of water and 6.5 kg of polycarboxylate superplasticizer were added and mixed together to obtain concrete.

[0088] Example 5

[0089] This embodiment provides a type of concrete, which is prepared by the following steps:

[0090] 225 kg of modified coarse aggregate prepared in Example 9, 675 kg of gravel, 600 kg of fine aggregate and 300 kg of cement were mixed together, and then 175 kg of water and 6.5 kg of polycarboxylate superplasticizer were added and mixed together to obtain concrete.

[0091] Comparative Example

[0092] Comparative Example 1

[0093] This comparative example provides a type of concrete prepared by the following steps:

[0094] 225 kg of modified coarse aggregate prepared in Preparation Example 10, 675 kg of gravel, 600 kg of fine aggregate and 300 kg of cement were mixed together, and then 175 kg of water and 6.5 kg of polycarboxylate superplasticizer were added and mixed together to obtain concrete.

[0095] Comparative Example 2

[0096] This comparative example provides a type of concrete prepared by the following steps:

[0097] 225 kg of modified coarse aggregate prepared in Preparation Example 11, 675 kg of gravel, 600 kg of fine aggregate and 300 kg of cement were mixed together, and then 175 kg of water and 6.5 kg of polycarboxylate superplasticizer were added and mixed together to obtain concrete.

[0098] Comparative Example 3

[0099] This comparative example provides a type of concrete prepared by the following steps:

[0100] 225 kg of modified coarse aggregate prepared in Example 12, 675 kg of gravel, 600 kg of fine aggregate and 300 kg of cement were mixed together, and then 175 kg of water and 6.5 kg of polycarboxylate superplasticizer were added and mixed together to obtain concrete.

[0101] Comparative Example 4

[0102] This comparative example provides a type of concrete prepared by the following steps:

[0103] 225 kg of modified coarse aggregate prepared in Example 13, 675 kg of gravel, 600 kg of fine aggregate and 300 kg of cement were mixed together, and then 175 kg of water and 6.5 kg of polycarboxylate superplasticizer were added and mixed together to obtain concrete.

[0104] Comparative Example 5

[0105] This comparative example provides a type of concrete prepared by the following steps:

[0106] 225 kg of modified coarse aggregate prepared in Example 14, 675 kg of gravel, 600 kg of fine aggregate and 300 kg of cement were mixed together, and then 175 kg of water and 6.5 kg of polycarboxylate superplasticizer were added and mixed together to obtain concrete.

[0107] Comparative Example 6

[0108] This comparative example provides a type of concrete prepared by the following steps:

[0109] Concrete is made by mixing 225 kg of coal slag, 675 kg of gravel, 600 kg of fine aggregate and 300 kg of cement, then adding 175 kg of water and 6.5 kg of polycarboxylate superplasticizer.

[0110] Performance testing

[0111] The concrete in the examples and comparative examples underwent performance testing. The specific testing items are as follows:

[0112] 1. 28d compressive strength: According to GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", 6. compressive strength, the specimen is a cubic specimen with a side length of 150cm.

[0113] 2. Freeze-thaw test: According to GB / T 50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete", 4. Freeze-thaw test, 4.2 rapid freezing method, record the maximum number of freeze-thaw cycles when the mass loss rate does not exceed 5%.

[0114] 3. Chloride ion penetration resistance test: According to GB / T 50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete", 7.1 Rapid chloride ion migration coefficient method for chloride ion penetration resistance test.

[0115] Table 1 Performance Test Data

[0116]

[0117] Combining Comparative Examples 5 and 6 with Table 1, it can be seen that by combining coal slag and ceramsite, with ceramsite as the core and the intercalation compound forming modified coarse aggregate with coal slag, the compressive strength of concrete can be effectively improved.

[0118] Based on Examples 2, 3, 4, and 5, and in conjunction with Table 1, it can be seen that modifying the ceramsite reduces its water absorption. Impregnating the surface of the ceramsite with silver sulfate solution dissolves unstable connections, improving the overall stability and resistance to chloride ion erosion of the crushed ceramsite. Modifying the coal slag reduces its water absorption. Mixing the modified coal slag with the modified ceramsite for granulation, using the modified ceramsite as an internal core and intercalation compound, enhances the compressive strength of the modified coarse aggregate, while also improving the durability of the concrete, thus strengthening its resistance to freezing and chloride ion penetration.

[0119] As can be seen from Examples 2, 1, 2, and 3, and Table 1, the internal components of the crushed coal slag are exposed, which facilitates the bonding of the wetting agent. At the same time, the water storage capacity of the coal slag is reduced due to the destruction of pores caused by crushing, thereby reducing the water absorption rate of the coal slag. Furthermore, the water absorption rate of the coal slag is further reduced by the bonding of the hydrophobic agent with the gelled coal slag, effectively reducing the situation where excessive water absorption by the coal slag leads to a decline in concrete performance.

[0120] As can be seen from Examples 2, 4, and 5 and Table 1, by adjusting the proportions of each component of the modified coarse aggregate, the concrete performance caused by the modified coarse aggregate changes. By selecting the optimal component ratio, the concrete performance can be effectively improved.

[0121] 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 construction engineering decorative pavement panel, characterized by, The raw materials include the following components by weight: coarse aggregate 800-1000 parts, fine aggregate 500-700 parts, cement 250-350 parts, water 150-200 parts, and polycarboxylic acid water reducer 5.5-7.5 parts; The coarse aggregate includes modified coarse aggregate and stone, and the weight ratio of the two is 1:1, and the modified coarse aggregate is prepared from modified coal-fired slag and modified ceramsite; The modified ceramsite includes broken ceramsite, modifier, and reinforcing agent; The modifier is a silver sulfate solution prepared from silver sulfate, concentrated sulfuric acid, isoamyl butyrate, and anhydrous ethanol; The modified coal-fired slag includes coal-fired slag, impregnating agent, and hydrophobic agent, and the weight ratio of the three is 6:(2-4):1; The impregnating agent is a mixture of ethyl acetate and anhydrous ethanol, and the weight ratio of the two is 1:1, and the hydrophobic agent is hydrophobic nano-titanium dioxide powder.

2. The architectural prefinished pavement panel of claim 1, wherein, The modified coarse aggregate has a particle size of 5-10 mm, and the stone has a particle size of 10-25 mm.

3. The architectural prefinished pavement panel of claim 1, wherein, The modified ceramsite is prepared by the following steps: immersing the broken ceramsite in the modifier, taking it out after 6 hours of impregnation, and then immersing it in the reinforcing agent for 1 hour of impregnation, and taking it out to obtain the modified ceramsite.

4. The architectural prefinished pavement panel of claim 1, wherein, The modified coal-fired slag is prepared by the following steps: crushing the coal-fired slag to 100 mesh, mixing the impregnating agent and the coal-fired slag, and then adding the hydrophobic agent to mix and stir uniformly, and then drying to obtain the modified coal-fired slag.

5. The architectural prefinished pavement panel of claim 1, wherein, The modified coarse aggregate is prepared by the following steps: mixing the modified coal-fired slag and the modified ceramsite according to a weight ratio of 10:(1-3), and then disc granulation, the binder is water glass, and the particles with a particle size of 5-10 mm are screened as the modified coarse aggregate.

6. A method of manufacturing a decorative pavement slab for construction engineering according to any one of claims 1-5, characterized in that, The method includes the following steps: The coarse aggregate, fine aggregate, and cement are stirred and mixed, and then the water and polycarboxylic acid water reducer are added and stirred and mixed to obtain the concrete.

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