Lightweight high-strength prefabricated cement board material based on industrial solid waste recycling and preparation method thereof

Abstract

The application relates to the field of building materials, in particular to a light high-strength prefabricated cement board material based on industrial solid waste recycling and a preparation method thereof. The light high-strength prefabricated cement board material based on industrial solid waste recycling is prepared from raw materials including ordinary Portland cement, active slag powder, ash, a reinforcing fiber combination, a composite functional agent and water. The cement board material provided by the application is prepared by scientifically matching multiple industrial solid wastes, realizes efficient resource utilization and environmental protection, significantly improves the internal structure of the material by means of a unique organic polymer composite additive system, effectively enhances the mechanical properties of the board, makes the board have excellent bending and cracking resistance on the basis of maintaining the lightness, and ensures the durability and dimensional stability during long-term use, and is suitable for the field of prefabricated building components which have high requirements on performance.

Description

Technical Field

[0001] This application relates to the field of building materials, and more specifically to a lightweight, high-strength precast cement board material based on the reuse of industrial solid waste and its preparation method. Background Technology

[0002] With the rapid development of industrialized construction and the widespread promotion of green building concepts, precast cement panels, as a core component of prefabricated buildings, are experiencing increasing market demand. Traditional precast cement panels primarily use natural resources such as cement, sand, and stone as raw materials, which not only consumes a large amount of natural resources but also generally suffers from problems such as high weight and poor crack resistance, posing significant limitations in transportation, installation, and structural lightweighting. Therefore, in recent years, the industry has focused on developing new lightweight and high-strength precast cement panels to maintain or improve mechanical properties while reducing weight, thus meeting the comprehensive needs of modern buildings for energy conservation, high efficiency, and environmental protection.

[0003] Against this backdrop, the resource utilization of industrial solid waste provides an important direction for the innovation of precast cement board materials. Industrial solid wastes, such as fly ash, slag, desulfurization gypsum, smelting slag, and tailings, are emitted in huge quantities annually. Their storage and disposal not only occupy land but also pose environmental risks. However, many industrial solid wastes, due to their certain pozzolanic activity or their potential as micro-aggregate fillers, show potential application value in cement-based materials. Existing research has explored incorporating single or multiple solid wastes into cement boards to partially replace cement or aggregates, thereby reducing production costs and achieving solid waste disposal. For example, fly ash can be used to replace a portion of cement to improve workability, or lightweight aggregates such as expanded perlite and ceramsite can be used to reduce the density of the boards.

[0004] However, existing lightweight cement board technologies based on industrial solid waste still face a series of pressing technical challenges. First, the incorporation of solid waste often leads to slow early strength development, and excessively high incorporation levels significantly reduce final mechanical strength, making it difficult to meet the performance requirements of high-strength structural or semi-structural components. Second, the introduction of porous lightweight aggregates or the formation of pores through foaming to achieve lightweighting often results in poor internal structural uniformity, making it difficult to optimize the balance between strength and density, and easily leading to increased brittleness and insufficient toughness. Furthermore, the composition of industrial solid waste from different sources and types fluctuates greatly, resulting in unstable interfacial bonding with the cement matrix, affecting the uniformity of board quality and long-term durability. Finally, existing technologies often focus on improving single performance indicators, lacking a systematic material design approach to synergistically optimize multiple objectives such as lightweight, high strength, weather resistance, thermal insulation, and cost, thus limiting their large-scale application in high-standard precast components. Summary of the Invention

[0005] In conclusion, how to fully utilize the physical and chemical properties of industrial solid waste through scientific material proportioning design and innovative preparation processes to develop a precast cement board material that combines low density, high mechanical properties, good durability / stability, and impermeability and moisture resistance has become an important and practically significant research topic in the current building materials field.

[0006] A lightweight, high-strength precast cement board material based on the reuse of industrial solid waste, comprising, by weight, the following raw materials: 35-50 parts ordinary silicate cement, 20-35 parts activated slag powder, 20-30 parts ash, 15-25 parts lightweight aggregate, 5-12 parts reinforcing fiber composite, 3-8 parts composite functional agent, 0.5-2 parts water-reducing agent, 1-3 parts early strength activator, 0.2-0.4 parts water-repellent agent, and 20-40 parts water.

[0007] Preferably, the ordinary silicate cement is PO 52.5 or PO 52.5R cement.

[0008] Preferably, the mass ratio of active slag powder to ash in the ordinary silicate cement is (4~4.8):(2.5~3.2):(2.2~2.6).

[0009] Preferably, the mass ratio of the ordinary silicate cement, the active slag powder and the ash is (4~4.5):(2.6~3):(2.3~2.5).

[0010] Preferably, the active slag powder is S95 or S105 grade blast furnace slag powder.

[0011] Preferably, the active slag powder is S95 grade blast furnace slag powder.

[0012] Preferably, the specific surface area of ​​the activated slag powder is ≥380m² / kg.

[0013] Preferably, the specific surface area of ​​the activated slag powder is ≥450m² / kg.

[0014] Preferably, the ash material is a combination of fly ash and silica fume.

[0015] Preferably, the mass ratio of fly ash to silica fume is (3~5):(1~1.4).

[0016] Preferably, the mass ratio of fly ash to silica fume is (4~5):(1~1.2).

[0017] Preferably, the silica fume has a SiO2 content of ≥85%.

[0018] Preferably, the silica fume has a SiO2 content of ≥92%.

[0019] Preferably, the fly ash is primary fly ash or secondary fly ash.

[0020] Preferably, the fly ash is Grade I fly ash.

[0021] Preferably, the lightweight aggregate is a porous ceramic lightweight aggregate.

[0022] Preferably, the average particle size of the porous ceramic lightweight aggregate is 2~5mm.

[0023] Preferably, the average particle size of the porous ceramic lightweight aggregate is 3-4 mm.

[0024] Preferably, the bulk density of the porous ceramic lightweight aggregate is 550~630 kg / m³.

[0025] Preferably, the bulk density of the porous ceramic lightweight aggregate is 600~630 kg / m³.

[0026] Preferably, the compressive strength of the porous ceramic lightweight aggregate is ≥2.5MPa.

[0027] Preferably, the compressive strength of the porous ceramic lightweight aggregate is ≥3MPa.

[0028] Preferably, the reinforcing fiber combination is a combination of chopped basalt fibers, polypropylene mesh fibers, and nano-silica dispersion.

[0029] Preferably, the mass ratio of the chopped basalt fiber, polypropylene mesh fiber and nano-silica dispersion is (3~5):(2~3):(0.7~1.2).

[0030] Preferably, the mass ratio of the chopped basalt fiber, polypropylene mesh fiber and nano-silica dispersion is (4~4.5):(2.1~2.6):(0.8~1).

[0031] Preferably, the average length of the chopped basalt fibers is 10-15 mm and the average diameter is 10-14 μm.

[0032] Preferably, the average length of the polypropylene mesh fibers is 16-24 mm.

[0033] The adopted reinforcement and functional component scheme, through the introduction of a composite system of basalt fiber, polypropylene mesh fiber, and nano-silica dispersion, provides a core foundation for improving the comprehensive performance of industrial solid waste-based cement boards. Basalt fiber, as the main load-bearing component, significantly shares the load on the matrix, directly improving the flexural and tensile strength of the board. Meanwhile, the three-dimensionally distributed polypropylene mesh fiber effectively restrains the plastic shrinkage and microcrack propagation of concrete through its connecting structure, greatly enhancing the material's toughness and crack resistance. The added nano-silica dispersion plays a crucial role in interface optimization and microstructure densification. Its extremely high activity not only promotes hydration reactions but also fills the weak interface areas between the fibers and the cementitious matrix, making stress transfer more uniform and effective, and significantly reducing porosity. The combined effect of these three components results in excellent impact resistance, volume stability, and impermeability and moisture resistance, thus ensuring the reliability of precast components during long-term use.

[0034] Preferably, the composite functional agent is a combination of ethylene-vinyl acetate copolymer powder and aqueous acrylate emulsion.

[0035] Preferably, the mass ratio of the ethylene-vinyl acetate copolymer powder to the aqueous acrylic emulsion is (2~3):(4~6).

[0036] Preferably, the mass ratio of the ethylene-vinyl acetate copolymer powder to the aqueous acrylic emulsion is (2.2~2.6):(5~5.4).

[0037] Preferably, the ethylene-vinyl acetate copolymer powder is VINNAPAS® 5044N, manufactured by Wacker Chemie AG, Germany.

[0038] Preferably, the aqueous acrylic emulsion is Acronal® S400F, manufactured by BASF, Germany.

[0039] The addition of composite functional agents significantly improves the overall performance of solid waste-based cement boards. Latex powder redisperses and forms a film in the cement hydration environment, effectively bridging microcracks and enhancing interfacial adhesion between phases, thereby significantly improving the material's flexural strength and toughness. Simultaneously, the water-based acrylic emulsion forms a continuous, dense, flexible polymer film network in the hardening system. This network not only adapts to internal stress changes and improves dimensional stability but also effectively blocks the penetration of moisture and harmful ions. The combined use of these two agents creates an organic-inorganic interpenetrating structural effect in the cement stone pores and aggregate-slurry interface region, achieving an optimized balance between rigidity and flexibility. This significantly reduces the strength loss and interfacial weakness that may result from high levels of industrial solid waste, and fundamentally enhances the mechanical reliability, crack resistance, and long-term water and moisture resistance of the boards.

[0040] Preferably, the mass ratio of the ordinary silicate cement, the reinforcing fiber combination, and the composite functional agent is (4~4.8):(0.7~1.1):(0.5~0.8).

[0041] Preferably, the mass ratio of the ordinary silicate cement, the reinforcing fiber combination, and the composite functional agent is (4~4.5):(0.9~1.1):(0.6~0.7).

[0042] Preferably, the water-reducing agent is any one of polycarboxylate-based high-performance water-reducing agents.

[0043] Preferably, the early strength activator is a combination of anhydrous sodium sulfate and metakaolin.

[0044] Preferably, the mass ratio of anhydrous sodium sulfate to metakaolin is (1~2):(3~5).

[0045] Preferably, the mass ratio of anhydrous sodium sulfate to metakaolin is (1.2~1.6):(3~4).

[0046] Preferably, the activity index of the metakaolin is ≥90%.

[0047] Preferably, the activity index of the metakaolin is ≥110%.

[0048] Preferably, the hydrophobic agent is any one of organosilicon hydrophobic agents.

[0049] A method for preparing lightweight, high-strength precast cement board material based on the reuse of industrial solid waste includes the following steps: S1: Lightweight aggregate and water-repellent agent are mixed and dried for later use, and then early strength activator and functional additives are premixed evenly; S2: In a forced mixer, the raw materials obtained in S1 are added sequentially, followed by reinforcing fiber composite and ordinary silicate cement, and dry-mixed for 100-200s until uniformly mixed to obtain dry material; S3: The remaining raw materials are added to the mixer to form a mixture, and the mixture is added to the dry material at a uniform speed while the mixer is running. After all the material is added, it is stirred at 300-400rpm for 3-5min until a uniform slurry is obtained. Finally, the slurry is poured into a mold, compacted and leveled by high-frequency vibration at 40-50Hz, steam-cured, demolded, and transferred to a standard curing room for curing to the specified age.

[0050] Preferably, after steam curing at 25°C for 2-3 hours, the temperature is increased to 65°C at a rate of 15°C / hour, and then maintained at a constant temperature for 8-10 hours, followed by natural cooling.

[0051] The beneficial effects of this application are:

[0052] 1. The cement board material provided in this application, through the scientific formulation of various industrial solid wastes, achieves efficient resource utilization and environmental protection. Simultaneously, by utilizing a unique organic polymer composite additive system, the internal structure of the material is significantly improved, effectively enhancing the mechanical properties of the board. This results in excellent flexural and crack resistance while maintaining its lightweight characteristics. Furthermore, the overall density and water repellency of the material are greatly improved, ensuring its long-term durability and dimensional stability, making it suitable for prefabricated building components with high performance requirements.

[0053] 2. The reinforcing and functional component scheme adopted in this application constructs a multi-scale composite reinforcement system through the synergistic interaction of basalt fiber, polypropylene mesh fiber, and nano-silica dispersion. The basalt fiber bears the load, significantly improving flexural and tensile strength; the three-dimensional distribution of the polypropylene mesh fiber effectively inhibits crack propagation and enhances toughness; and the nano-silica optimizes the interface structure and promotes matrix densification. The combined effect of these three components not only significantly improves the impact resistance and volume stability of the slab but also significantly enhances its impermeability and moisture resistance, thereby comprehensively ensuring the reliability and durability of the precast components during long-term use.

[0054] 3. The addition of the composite functional agent in this application constructs an organic-inorganic interpenetrating structure within the cement matrix through the film-forming bridging of latex powder and the flexible network formed by the acrylic emulsion. This structure not only significantly improves the flexural strength, toughness, and interfacial adhesion of the material, but also effectively adapts to changes in internal stress, enhances dimensional stability, and blocks the penetration of moisture and harmful ions. The synergistic effect of these two factors fundamentally compensates for the weak matrix defects caused by high levels of solid waste, resulting in excellent mechanical reliability, crack resistance, and long-term water and moisture resistance of the board. Detailed Implementation Example 1

[0055] A lightweight, high-strength precast cement board material based on the reuse of industrial solid waste, comprising, by weight, the following raw materials: 42.5 parts ordinary Portland cement, 28.5 parts activated slag powder, 24 parts ash, 20.6 parts lightweight aggregate, 10.2 parts reinforcing fiber composite, 6.6 parts composite functional agent, 1.2 parts water-reducing agent, 2.4 parts early strength activator, 0.3 parts water-repellent agent, and 30 parts water.

[0056] The ordinary Portland cement is Conch Cement PO 52.5; the active slag powder is S95 grade blast furnace slag powder, with a specific surface area of ​​472 m² / kg.

[0057] The ash material is a combination of fly ash and silica fume in a mass ratio of 4.5:1. The silica fume has an SiO2 content of 93.2%, and the fly ash is grade I fly ash.

[0058] The lightweight aggregate is a porous ceramic lightweight aggregate with an average particle size of 3.4 mm, a bulk density of 600 kg / m³, and a cylinder compressive strength of 3.6 MPa.

[0059] The reinforcing fiber composition consists of chopped basalt fibers, polypropylene mesh fibers, and nano-silica dispersion in a mass ratio of 4.2:2.5:0.8. The chopped basalt fibers have an average length of 12 mm and an average diameter of 10 μm, and are sourced from Haosong Fibers in Tai'an, China; the polypropylene mesh fibers have an average length of 18 mm, also sourced from Haosong Fibers in Tai'an, China; and the nano-silica dispersion has a solid content of 30%.

[0060] The composite functional agent is a combination of ethylene-vinyl acetate copolymer powder and waterborne acrylic emulsion in a mass ratio of 2.6:5.4. The ethylene-vinyl acetate copolymer powder is VINNAPAS® 5044N, manufactured by Wacker Chemie AG, Germany; the waterborne acrylic emulsion is Acronal® S400F, manufactured by BASF, Germany.

[0061] The water-reducing agent is a polycarboxylate-based high-performance water-reducing agent, manufactured by Shandong Hongquan Chemical Co., Ltd.

[0062] The early strength activator is a combination of anhydrous sodium sulfate and metakaolin in a mass ratio of 1.5:3.5. The activity index of the metakaolin is ≥115%. The water-repellent agent is organosilicon water-repellent agent MT, manufactured by Beijing Mengtai Weiye Building Materials.

[0063] A method for preparing lightweight, high-strength precast cement board material based on industrial solid waste recycling includes the following steps: S1: Lightweight aggregate and water-repellent agent are mixed and dried for later use, and then early strength activator and functional additives are premixed evenly; S2: In a forced mixer, the raw materials obtained in S1 are added sequentially, followed by reinforcing fiber composite and ordinary silicate cement, and dry-mixed for 180s until uniformly mixed to obtain dry material; S3: The remaining raw materials are added to the mixer to form a mixture, and the mixture is added to the dry material at a uniform speed while the mixer is running. After all the materials are added, the mixture is stirred at 400rpm for 5min until a uniform slurry is obtained. Finally, the slurry is poured into a mold, compacted and leveled by 50Hz high-frequency vibration, steam-cured at 25℃ for 3h, then heated to 65℃ at 15℃ / h, and kept at a constant temperature for 10h. After that, the material is naturally cooled and demolded, and then transferred to a standard curing room for curing to the specified age. Example 2

[0064] This embodiment differs from Embodiment 1 only in the following aspects: A lightweight, high-strength precast cement board material based on the reuse of industrial solid waste, comprising, by weight, the following raw materials: 45 parts ordinary silicate cement, 28.5 parts activated slag powder, 24 parts ash, 20.6 parts lightweight aggregate, 11 parts reinforcing fiber composite, 5.5 parts composite functional agent, 1.2 parts water-reducing agent, 2.4 parts early strength activator, 0.3 parts water-repellent agent, and 30 parts water.

[0065] The remaining implementation methods are the same. Example 3

[0066] This embodiment differs from Embodiment 1 only in the following aspects: A lightweight, high-strength precast cement board material based on the reuse of industrial solid waste, comprising, by weight, the following raw materials: 40 parts ordinary silicate cement, 28.5 parts activated slag powder, 24 parts ash, 20.6 parts lightweight aggregate, 8.5 parts reinforcing fiber composite, 7.6 parts composite functional agent, 1.2 parts water-reducing agent, 2.4 parts early strength activator, 0.3 parts water-repellent agent, and 30 parts water.

[0067] The remaining implementation methods are the same.

[0068] Comparative Example 1

[0069] This comparative example differs from Example 1 only in the following aspects: A lightweight, high-strength precast cement board material based on the reuse of industrial solid waste, by weight, comprises the following raw materials: 50 parts of ordinary silicate cement, 32 parts of activated slag powder, 28 parts of ash, 25.5 parts of lightweight aggregate, 13.4 parts of reinforcing fiber composite, 1.5 parts of composite functional agent, 1.4 parts of water-reducing agent, 2.5 parts of early strength activator, 0.4 parts of water-repellent agent, and 35 parts of water.

[0070] The remaining implementation methods are the same.

[0071] Comparative Example 2

[0072] This comparative example differs from Example 1 only in the following aspects: A lightweight, high-strength precast cement board material based on the reuse of industrial solid waste, by weight, comprises the following raw materials: 42.5 parts of ordinary silicate cement, 28.5 parts of activated slag powder, 24 parts of ash, 20.6 parts of lightweight aggregate, 4 parts of reinforcing fiber composite, 8.8 parts of composite functional agent, 1.2 parts of water-reducing agent, 2.4 parts of early strength activator, 0.3 parts of water-repellent agent, and 30 parts of water.

[0073] The remaining implementation methods are the same.

[0074] Comparative Example 3

[0075] The only difference between this comparative example and Example 1 is that the reinforcing fiber combination is a combination of short-cut basalt fibers, polypropylene mesh fibers and nano-silica dispersion in a mass ratio of 5:1:1.5.

[0076] The remaining implementation methods are the same.

[0077] Comparative Example 4

[0078] The only difference between this comparative example and Example 1 is that the reinforcing fiber combination is a combination of short-cut basalt fibers, polypropylene mesh fibers and nano-silica dispersion, with a mass ratio of 4:3.3:0.2.

[0079] The remaining implementation methods are the same.

[0080] Comparative Example 5

[0081] The only difference between this comparative example and Example 1 is that the composite functional agent is a combination of ethylene-vinyl acetate copolymer powder and water-based acrylic emulsion in a mass ratio of 1:7.

[0082] The remaining implementation methods are the same.

[0083] Comparative Example 6

[0084] The only difference between this comparative example and Example 1 is that the composite functional agent is a combination of ethylene-vinyl acetate copolymer powder and water-based acrylic emulsion in a mass ratio of 4:2.

[0085] The remaining implementation methods are the same.

[0086] Performance testing

[0087] 1. Dry density and porosity: The prepared cement board was cured for 28 days to obtain 100mm×100mm×100mm specimens, which were dried in an oven at 105±5℃ to constant weight. After cooling, their dimensions were measured and weighed, the dry density was calculated, and their porosity was measured by vacuum saturation method. The results were recorded as the average of 10 tests in Table 1.

[0088] 2. Mechanical properties: The cement board was cured for 28 days to obtain 100mm×100mm×400mm specimens. The compressive strength was tested on a universal testing machine, and the results were recorded as the average of 10 tests in Table 1.

[0089] 3. Drying shrinkage rate: The test is conducted in accordance with GB / T 50082-2009. The specimen is a prism specimen with a diameter of 100mm×100mm×515mm. After standard curing for 3 days, it is moved into a constant temperature and humidity chamber with a temperature of 20±2℃ and a relative humidity of 60±5%. The length change is measured periodically using a length comparator, and the drying shrinkage value is recorded after 180 days. The results are recorded in Table 1.

[0090] 4. Water absorption rate: The prepared cement board was cured for 28 days to obtain 100mm×100mm×100mm specimens. The dried specimens were immersed in water at 20±5℃ until constant weight, and the volume water absorption rate was calculated. The results were recorded in Table 1 as the average of 10 tests.

[0091] Table 1 Performance Test Results

[0092]

[0093] The reinforcement and functional component schemes used in Examples 1-3, as defined in this application, synergistically construct a multi-scale composite reinforcement system through basalt fiber, polypropylene mesh fiber, and nano-silica dispersion. The addition of composite functional agents, along with the film-forming bridging of latex powder and the flexible network formed by the acrylate emulsion, creates an organic-inorganic interpenetrating structure within the cement matrix, significantly improving the overall performance of the cement board material. In contrast, Comparative Examples 1-6, employing different non-defined technical solutions, resulted in a significant decrease in the technical effectiveness of their respective solutions in the final cement board materials, ultimately leading to a decline in the overall performance of the cement board materials.

Claims

1. A lightweight, high-strength precast cement board material based on the recycling of industrial solid waste, characterized in that: By weight, the raw materials include: 35-50 parts of ordinary silicate cement, 20-35 parts of activated slag powder, 20-30 parts of ash, 15-25 parts of lightweight aggregate, 5-12 parts of reinforcing fiber composite, 3-8 parts of composite functional agent, 0.5-2 parts of water-reducing agent, 1-3 parts of early strength activator, 0.2-0.4 parts of water-repellent agent, and 20-40 parts of water; The ordinary Portland cement is PO 52.5 or PO 52.5R cement; The active slag powder is S95 grade or S105 grade blast furnace slag powder; The reinforcing fiber combination is a combination of chopped basalt fibers, polypropylene mesh fibers, and nano-silica dispersion, with a mass ratio of (3~5):(2~3):(0.7~1.2). The composite functional agent is a combination of ethylene-vinyl acetate copolymer powder and aqueous acrylic emulsion, with a mass ratio of (2~3):(4~6). The ash material is a combination of fly ash and silica fume, with a mass ratio of (3~5):(1~1.4).

2. The lightweight, high-strength precast cement board material based on industrial solid waste recycling according to claim 1, characterized in that: The mass ratio of active slag powder to ash in the ordinary silicate cement is (4~4.8):(2.5~3.2):(2.2~2.6).

3. The lightweight, high-strength precast cement board material based on industrial solid waste recycling according to claim 2, characterized in that: The specific surface area of ​​the activated slag powder is ≥380m². 2 / kg; the SiO2 content of the silica fume is ≥85%.

4. The lightweight, high-strength precast cement board material based on industrial solid waste recycling according to claim 3, characterized in that: The lightweight aggregate is a porous ceramic lightweight aggregate; the average particle size of the porous ceramic lightweight aggregate is 2~5mm; the bulk density of the porous ceramic lightweight aggregate is 550~630kg / m³. 3 .

5. The lightweight, high-strength precast cement board material based on industrial solid waste recycling according to claim 4, characterized in that: The mass ratio of the reinforcing fiber composite and the composite functional agent in the ordinary silicate cement is (4~4.8):(0.7~1.1):(0.5~0.8).

6. The lightweight, high-strength precast cement board material based on industrial solid waste recycling according to claim 5, characterized in that: The water-reducing agent is a polycarboxylate-based high-performance water-reducing agent.

7. The lightweight, high-strength precast cement board material based on industrial solid waste recycling according to claim 6, characterized in that: The early strength activator is a combination of anhydrous sodium sulfate and metakaolin, with a mass ratio of (1~2):(3~5).

8. The lightweight, high-strength precast cement board material based on industrial solid waste recycling according to claim 7, characterized in that: The average length of the chopped basalt fibers is 10-15 mm, and the average diameter is 10-14 μm; the average length of the polypropylene mesh fibers is 16-24 mm.

9. A method for preparing a lightweight, high-strength precast cement board material based on the reuse of industrial solid waste according to claim 8, characterized in that: Includes the following steps: S1: Mix and dry the lightweight aggregate with the water-repellent agent for later use. Then, premix the early strength activator and composite functional agent evenly. S2: In a forced mixer, add the raw materials obtained in S1 in sequence, followed by the reinforcing fiber combination and ordinary silicate cement. Dry mix for 100-200 seconds until evenly mixed to obtain dry material. S3: Add the remaining raw materials to the mixer to form a mixture. While the mixer is running, add the mixture evenly to the dry material. After all the materials are added, stir at 300-400 rpm for 3-5 minutes until a uniform slurry is obtained. Finally, pour the slurry into the mold, compact and level the surface with 40-50Hz high-frequency vibration, steam cure, demold, and transfer to a standard curing room for curing to the specified age.

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