Environment-friendly pervious concrete, preparation method and application thereof

Abstract

The application discloses an environment-friendly water-permeable concrete, a preparation method and application, and the environment-friendly water-permeable concrete comprises the following raw materials in parts by weight: 8-15 parts of vinyl acetate resin; 15-30 parts of acrylate emulsion; 200-300 parts of basalt crushed stone; 8-20 parts of reinforcing agent; 5-15 parts of water reducing agent; 80-130 parts of cement; 40-60 parts of water; 10-20 parts of microcrystalline cellulose; and 15-30 parts of porous silicon micro powder modified by distearyl oxyisopropyl aluminumate. The environment-friendly water-permeable concrete has the characteristics of air permeability and water permeability, and has good mechanical properties, excellent bonding, crack resistance, frost resistance and anti-seepage performance.

Description

Technical Field

[0001] This application relates to the field of concrete technology, and in particular to an environmentally friendly permeable concrete, its preparation method, and its application. Background Technology

[0002] Currently, with increasingly severe environmental problems, permeable concrete, as an innovative pavement material that balances ecological protection and urban infrastructure construction, has attracted much attention. Traditional impermeable pavements have caused a series of environmental problems, such as declining groundwater levels, surface runoff pollution, and geological disasters, and have exacerbated the urban heat island effect and noise pollution. In contrast, permeable concrete, with its unique honeycomb structure, not only allows for rapid rainwater infiltration and groundwater replenishment, reducing the pressure on urban drainage systems, but also absorbs and filters pollutants in rainwater to a certain extent, contributing to the restoration of urban surface ecological balance and the improvement of microclimate, and reducing traffic safety risks caused by water accumulation. However, current permeable concrete still has shortcomings in terms of permeability, compressive strength, and crack resistance. Summary of the Invention

[0003] In order to solve at least one of the above-mentioned technical problems and develop a permeable concrete with good permeability, high compressive strength and good crack resistance, this application provides an environmentally friendly permeable concrete, a preparation method and an application.

[0004] In a first aspect, this application provides an environmentally friendly permeable concrete, which comprises the following raw materials in parts by weight:

[0005] By adopting the above technical solutions, the environmentally friendly permeable concrete prepared in this application possesses the characteristics of air permeability and water permeability, and also exhibits good mechanical properties. This application adds multiple components during the preparation of the environmentally friendly permeable concrete. Among them, the combined use of vinyl acetate resin and acrylic emulsion enhances the adhesion and toughness of the permeable concrete, reduces the risk of cracking due to external stress, and improves the crack resistance of the concrete. This application uses basalt crushed stone as aggregate, which not only provides excellent compressive strength but also, due to its natural porous characteristics, helps to form an interconnected pore structure, significantly improving the permeability of the concrete. Furthermore, by adding appropriate amounts of reinforcing agents and water-reducing agents, this application can further optimize the internal microstructure of the concrete, improving its density and strength. Simultaneously, the use of water-reducing agents helps to reduce capillary pores in the concrete, making the permeable channels more unobstructed. This application incorporates microcrystalline cellulose and distearate-modified porous silica powder during the preparation of environmentally friendly permeable concrete. The microcrystalline cellulose is effectively dispersed in the concrete, enhancing its tensile strength through a bridging effect and positively contributing to improved pore distribution. The distearate-modified porous silica powder significantly improves the workability and mechanical properties of the concrete. In particular, the dense network structure formed within the concrete by the modified porous silica powder enhances overall compressive strength without compromising permeability.

[0006] In summary, the environmentally friendly permeable concrete provided in this application has ideal permeability, high strength and excellent crack resistance, and has important practical value and broad application prospects for solving urban flooding, improving the ecological environment and extending the service life of roads.

[0007] Optionally, the weight ratio of the microcrystalline cellulose to the distearate-modified porous silica powder is 1:(1.3-1.8).

[0008] By employing the above-mentioned technical solution, the microcrystalline cellulose and distearyloxyisopropyl aluminate-modified porous silica powder are compounded at a weight ratio of 1:(1.3-1.8), which can significantly improve the compressive strength and crack resistance of the resulting composite material. On the one hand, microcrystalline cellulose, as a structural reinforcing material, can endow the composite material with high mechanical strength, especially compressive strength; on the other hand, the distearyloxyisopropyl aluminate-modified porous silica powder has a rich pore structure, which not only increases the porosity of the material to improve water permeability, but also, after modification, has a tighter interfacial bond with microcrystalline cellulose, further synergistically enhancing the overall structural stability and mechanical properties.

[0009] Therefore, this formulation design can effectively improve the water and air permeability of the composite material while ensuring good compressive strength. It is suitable for special applications that require both high strength and excellent water permeability, such as certain high-grade building materials or environmentally friendly filter materials.

[0010] Optionally, the weight ratio of the microcrystalline cellulose to the distearate-modified porous silica powder is 1:1.5.

[0011] By adopting the above technical solution, this application can successfully optimize and regulate the performance of composite materials by precisely controlling the weight ratio of microcrystalline cellulose and distearate-modified porous silica powder to 1:1.5, so that it can meet the requirements of high strength while taking into account the multifunctional requirements such as water permeability and air permeability.

[0012] Optionally, the total weight of the microcrystalline cellulose and the distearate-modified porous silica powder accounts for 7.08-8.70% of the total weight of the environmentally friendly permeable concrete.

[0013] By adopting the above technical solution and by finely controlling the content ratio of microcrystalline cellulose and distearate-modified porous silica powder, the environmentally friendly permeable concrete proposed in this application not only achieves an efficient combination of mechanical properties and permeability, but also fully considers the economic and environmental impact in practical applications, demonstrating its broad application potential and value in modern urban construction.

[0014] Optionally, the preparation method of the distearate-modified porous silica powder includes the following steps: mixing distearate-modified porous silica powder with porous silica powder at a weight ratio of (1-5):(15-25), dispersing it in a solution of water and ethanol at a volume ratio of 1:9, ultrasonically treating it at 50°C for 1-3 hours, then filtering it and drying it at 60°C-70°C for 2-3 hours to obtain the distearate-modified porous silica powder.

[0015] By adopting the above-mentioned technical solution, distearate-modified porous silica powder plays a crucial role in the environmentally friendly permeable concrete of this application. First, through a unique modification process, it successfully preserves the original rich pore structure of the porous silica powder. These pores form effective permeable channels inside the concrete, greatly improving the permeability of the concrete, helping to quickly drain road surface water, reducing urban flooding pressure, and improving the ecological environment.

[0016] Secondly, the porous silica powder modified with distearate-isopropyl aluminate exhibits optimized surface properties and enhanced compatibility with cement paste and other components. This allows it to form a denser and more stable network structure within the concrete, strengthening its overall integrity and significantly improving its compressive strength and durability. Furthermore, the modified porous silica powder, in conjunction with microcrystalline cellulose, optimizes the mechanical properties of permeable concrete, particularly demonstrating excellent crack resistance. This significantly reduces the risk of cracks caused by external loads and environmental factors, extending the service life of the concrete structure.

[0017] Distearate isopropyl aluminate contains fatty acid groups and aluminate groups. The aluminate groups can hydrolyze with the hydroxyl groups on the surface of porous silica powder to generate silanols, which then condense with the silanols, forming an organic molecular layer on the silica powder surface. In addition to chemical bonding, the distearate oxygen moiety, due to its long-chain hydrocarbon structure, can form a stable physical adsorption layer on the porous silica powder surface through van der Waals forces or hydrophobic effects, increasing the hydrophobicity of the silica powder surface. Improving the hydrophobicity of components such as porous silica powder can, to some extent, prevent excessive water retention inside the concrete, maintaining good permeability while enhancing the ability to repel surface moisture, preventing excessive water penetration and freezing from damaging the concrete structure. Permeable concrete is frequently exposed to harsh environments and is susceptible to water erosion, salt crystallization, and freeze-thaw cycles. Improving the hydrophobicity of the filler material inside concrete helps reduce the intrusion of these harmful substances, thereby enhancing the durability and service life of the concrete. Furthermore, the inorganic-organic interface properties of porous silica powder treated with distearyloxyisopropyl aluminate are significantly improved, enhancing the interaction with the polymer matrix and reducing phase separation caused by polarity differences between the inorganic filler and the polymer. The modified porous silica powder exhibits better dispersibility in the matrix, contributing to improved mechanical properties and permeability of concrete.

[0018] In summary, the distearate-modified porous silica powder plays a crucial role in enhancing and improving the environmentally friendly permeable concrete of this invention. It not only improves the permeability of the concrete but also ensures that it has good compressive strength and crack resistance, thus achieving the dual goals of high performance and environmental protection.

[0019] Optionally, the reinforcing agent is selected from at least one of coconut fiber and polyester fiber.

[0020] Optionally, the reinforcing agent includes coconut shell fiber and polyester fiber; wherein the weight ratio of the coconut shell fiber and polyester fiber is 1:1.

[0021] Optionally, the water-reducing agent is selected from polycarboxylate water-reducing agents.

[0022] Optionally, the environmentally friendly permeable concrete may also include 5-10 parts of hydroxypropyl distarch phosphate.

[0023] By adopting the above technical solution and adding 5-10 parts of hydroxypropyl distarch phosphate to environmentally friendly permeable concrete, this application further optimizes the performance of concrete. Firstly, the addition of hydroxypropyl distarch phosphate improves the internal moisture distribution of the concrete, preventing premature water loss and poor hardening, thus enhancing the early strength and later stability of the concrete. Secondly, hydroxypropyl distarch phosphate effectively fills the internal pores of the concrete, increasing its density and thereby improving its impermeability, freeze-thaw resistance, and chemical corrosion resistance, extending the service life of permeable concrete pavements and permeable pipes. Thirdly, hydroxypropyl distarch phosphate improves the fluidity of the concrete mix during mixing and pouring, facilitating construction and promoting a more uniform and fine microstructure within the concrete, further enhancing its permeability. Fourthly, as a biodegradable and environmentally friendly additive, the use of hydroxypropyl distarch phosphate aligns with the development trend of green building materials and contributes to the sustainable development of the construction industry. Therefore, through this technical solution, environmentally friendly permeable concrete not only maintains its original permeability characteristics but also improves its overall performance, making it perform better in practical applications.

[0024] Secondly, this application provides a method for preparing environmentally friendly permeable concrete, the method comprising the following steps: S1. Add water-reducing agent and acrylic emulsion to water and stir to mix evenly to obtain a mixture; S2. Mix the remaining raw materials and add them to a concrete mixer and mix evenly. Then add the mixture obtained in step S1 and continue mixing until evenly mixed to obtain the environmentally friendly permeable concrete.

[0025] By adopting the above technical solution, the environmentally friendly permeable concrete preparation method provided in this application is simple in process and easy to operate. The prepared concrete has both good permeability and high strength characteristics, which not only responds to the green and environmentally friendly construction concept, but also realizes the effective utilization of resources.

[0026] Thirdly, this application provides an application of environmentally friendly permeable concrete in the preparation of permeable pavements and permeable pipes.

[0027] By adopting the above technical solutions, the application of environmentally friendly permeable concrete provided in this application in permeable pavements and permeable pipes can not only effectively solve urban drainage problems and improve infrastructure functions, but also actively promote the construction industry to develop in a more environmentally friendly and sustainable direction.

[0028] In summary, the present invention has at least one of the following beneficial technical effects: 1. The environmentally friendly permeable concrete prepared in this application is characterized by air permeability and water permeability, and also possesses good mechanical properties. This application incorporates multiple components during the preparation of the environmentally friendly permeable concrete. Among them, the combined use of vinyl acetate resin and acrylic emulsion enhances the adhesion and toughness of the permeable concrete, reduces the risk of cracking due to external stress, and improves the crack resistance of the concrete. This application uses basalt crushed stone as aggregate, which not only provides excellent compressive strength but also, due to its natural porous nature, helps to form an interconnected pore structure, significantly improving the permeability of the concrete. Furthermore, by adding appropriate amounts of reinforcing agents and water-reducing agents, this application can further optimize the internal microstructure of the concrete, improving its density and strength. Simultaneously, the use of water-reducing agents helps to reduce capillary pores in the concrete, making the permeable channels more unobstructed. This application involves adding microcrystalline cellulose and distearate-modified porous silica powder to the preparation of environmentally friendly permeable concrete. The microcrystalline cellulose is effectively dispersed in the concrete, improving its tensile and flexural strength through a bridging effect, and also plays a positive role in improving the pore distribution of the permeable concrete. The distearate-modified porous silica powder significantly improves the workability and mechanical properties of the concrete. In particular, the dense network structure formed by the modified porous silica powder within the concrete enhances the overall compressive strength without affecting its permeability.

[0029] In summary, the environmentally friendly permeable concrete provided in this application has ideal permeability, high strength and excellent crack resistance, and has important practical value and broad application prospects for solving urban flooding, improving the ecological environment and extending the service life of roads.

[0030] 2. The compounding of microcrystalline cellulose and distearyloxyisopropyl aluminate-modified porous silica powder at a weight ratio of 1:(1.3-1.8) can significantly improve the compressive strength and crack resistance of the resulting composite material. On the one hand, microcrystalline cellulose, as a structural reinforcing material, can impart high mechanical strength to the composite material, especially its compressive strength; on the other hand, the distearyloxyisopropyl aluminate-modified porous silica powder has a rich pore structure, which not only increases the porosity of the material to improve water permeability, but also, after modification, has a tighter interfacial bond with microcrystalline cellulose, further synergistically enhancing the overall structural stability and mechanical properties.

[0031] Therefore, this formulation design can effectively improve the water and air permeability of the composite material while ensuring good compressive strength. It is suitable for special applications that require both high strength and excellent water permeability, such as certain high-grade building materials or environmentally friendly filter materials. 3. Distearate-modified porous silica powder plays a crucial role in the environmentally friendly permeable concrete of this invention. Firstly, through a unique modification process, it successfully retains the rich pore structure of the original porous silica powder. These pores form effective permeable channels within the concrete, greatly improving its permeability, facilitating rapid drainage of surface water, alleviating urban flooding pressure, and improving the ecological environment. Secondly, the surface properties of the distearate-modified porous silica powder are optimized, enhancing its compatibility with cement paste and other components. This allows it to form a denser and more stable network structure within the concrete, strengthening its integrity and significantly improving its compressive strength and durability. Furthermore, the modified porous silica powder, in conjunction with microcrystalline cellulose, optimizes the mechanical properties of the permeable concrete, particularly its crack resistance, significantly reducing the risk of cracks caused by external loads and environmental factors, and extending the service life of the concrete structure. In summary, the distearate-modified porous silica powder plays a crucial role in enhancing and improving the environmentally friendly permeable concrete of this invention. It not only improves the permeability of the concrete but also ensures that it has good compressive strength and crack resistance, thus achieving the dual goals of high performance and environmental protection.

[0032] 1. The environmentally friendly permeable concrete preparation method provided in this application is simple in process and easy to operate. The concrete prepared has both good permeability and high strength characteristics, which not only responds to the concept of green and environmentally friendly construction, but also realizes the effective use of resources.

[0033] 2. The application of the environmentally friendly permeable concrete provided in this application in permeable pavements and permeable pipes can not only effectively solve urban drainage problems and improve infrastructure functions, but also actively promote the construction industry to develop in a more environmentally friendly and sustainable direction. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the embodiments.

[0035] Vinyl acetate resin: Jinan Huijinchuan Chemical Co., Ltd., CAS No. CAS108-05-4.

[0036] Acrylic emulsion: Guangzhou Hengfu Waterproof Materials Co., Ltd., model J100.

[0037] Basalt gravel: average particle size is 3-5mm.

[0038] Coconut husk fiber: average length 100mm.

[0039] Polyester fiber: Shandong Yiyang Engineering Materials Co., Ltd., 6-19mm.

[0040] High-efficiency polycarboxylate superplasticizer: Henan Taiji Chemical Products Co., Ltd., powder with a solid content of 98%.

[0041] Silicate cement: CAS No. 1327-39-5, purity 99%.

[0042] Microcrystalline cellulose: CAS No. 9004-34-6, active ingredient content is 99%.

[0043] Distearate isopropyl aluminate: Nanjing Bermuda Biotechnology Co., Ltd., with an active ingredient content of 99%.

[0044] Porous silica powder: Shandong Jialin Energy Technology Co., Ltd., particle size 2000 mesh.

[0045] Hydroxypropyl distarch phosphate: Xi'an Lavia Biotechnology Co., Ltd., CAS No. 53124-00-8. Specific Implementation

[0046] Preparation Examples 1-3 Preparation Example 1 This preparation example provides a distearate-modified porous silica powder, the preparation method of which includes the following steps: 100g of distearyloxyisopropylaluminate was mixed with 1500g of porous silica powder and dispersed in a solution (2000g) of water and ethanol in a volume ratio of 1:9. The mixture was ultrasonically treated at 50℃ for 3h, then filtered and dried at 60℃ for 3h to obtain distearyloxyisopropylaluminate modified porous silica powder.

[0047] Preparation Example 2 The difference between this preparation example and Preparation Example 1 is that the preparation method for distearyloxyisopropyl aluminate modified porous silica powder includes the following steps: 350g of distearyloxyisopropylaluminate was mixed with 2200g of porous silica powder and dispersed in a solution (4000g) of water and ethanol in a volume ratio of 1:9. The mixture was ultrasonically treated at 50℃ for 2h, then filtered and dried at 65℃ for 2.5h to obtain distearyloxyisopropylaluminate modified porous silica powder.

[0048] Preparation Example 3 The difference between this preparation example and Preparation Example 1 is that the preparation method for distearyloxyisopropyl aluminate modified porous silica powder includes the following steps: Mix 500g of distearyloxyisopropylaluminate with 2500g of porous silica powder, and disperse in a solution (5000g) of water and ethanol in a volume ratio of 1:9. Sonicate at 50°C for 1h, then filter and dry at 70°C for 2h to obtain distearyloxyisopropylaluminate modified porous silica powder.

[0049] Example 1 This embodiment provides an environmentally friendly permeable concrete, which comprises the following raw materials in parts by weight: 8 parts vinyl acetate resin; 15 parts acrylate emulsion; 200 parts basalt crushed stone; 8 parts reinforcing agent; 5 parts water-reducing agent; 80 parts cement; 40 parts water; 16 parts microcrystalline cellulose; 24 parts distearate-modified porous silica powder.

[0050] The preparation method is as follows: S1. Add water-reducing agent and acrylic emulsion to water and stir to mix evenly to obtain a mixture; S2. Mix the remaining raw materials and add them to a concrete mixer and mix evenly. Then add the mixture obtained in step S1 and continue mixing until evenly mixed to obtain the environmentally friendly permeable concrete.

[0051] The distearate-modified porous silica powder in this embodiment was prepared in Preparation Example 1.

[0052] The basalt gravel in this embodiment has a particle size of 5-10 mm.

[0053] The water-reducing agent used in this embodiment is selected from high-efficiency polycarboxylate water-reducing agents.

[0054] The cement used in this embodiment is selected from silicate cement.

[0055] The reinforcing agent in this embodiment is selected from coconut shell fiber.

[0056] Examples 2-4 Example 2 The difference between this embodiment and Embodiment 1 is that, in preparing environmentally friendly permeable concrete, the total weight of microcrystalline cellulose and distearyloxyisopropyl aluminate modified porous silica powder is 40 parts, and the weight ratio of microcrystalline cellulose and distearyloxyisopropyl aluminate modified porous silica powder is 1:1.3.

[0057] Example 3 The difference between this embodiment and Embodiment 1 is that, in preparing environmentally friendly permeable concrete, the total weight of microcrystalline cellulose and distearyloxyisopropyl aluminate modified porous silica powder is 40 parts, and the weight ratio of microcrystalline cellulose and distearyloxyisopropyl aluminate modified porous silica powder is 1:1.7.

[0058] Example 4 The difference between this embodiment and Embodiment 1 is that, in preparing environmentally friendly permeable concrete, the total weight of microcrystalline cellulose and distearyloxyisopropyl aluminate modified porous silica powder is 40 parts, and the weight ratio of microcrystalline cellulose and distearyloxyisopropyl aluminate modified porous silica powder is 1:1.8.

[0059] Comparative Examples 1-3 Comparative Example 1 The difference between this comparative example and Example 1 is that microcrystalline cellulose was not added when preparing the environmentally friendly permeable concrete.

[0060] Comparative Example 2 The difference between this comparative example and Example 1 is that distearate-modified porous silica powder was not added when preparing the environmentally friendly permeable concrete.

[0061] Comparative Example 3 The difference between this comparative example and Example 1 is that, in the preparation of environmentally friendly permeable concrete, distearate-modified porous silica powder and microcrystalline cellulose were not added.

[0062] Comparative Example 4 The difference between this comparative example and Example 1 is that, in the preparation of environmentally friendly permeable concrete, an equal amount of porous silica powder is used to replace the distearate-modified porous silica powder.

[0063] Experimental testing: Compressive strength test and crack resistance test: According to GB / T 50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete", the concrete prepared in Examples 1-3 and Comparative Examples 1-3 were made into standard specimens. After curing for 28 days, their compressive strength and splitting tensile strength were tested. Permeability test: The permeability coefficient (mm / s) of the prepared concrete is determined according to GB / T25993-2010 "Instructions for Test Device of Permeability Coefficient of Standard Permeable Cement Concrete".

[0064] The experimental test results of Examples 1-4 and Comparative Examples 1-3 are shown in Table 1.

[0065] Table 1 - Experimental test results of Examples 1-4 and Comparative Examples 1-3 Results Analysis: The difference between Examples 2-4 and Example 1 lies in the different weight ratios of microcrystalline cellulose and distearyloxyisopropyl aluminate modified porous silica powder when preparing environmentally friendly permeable concrete. According to the experimental test results in Table 1, the environmentally friendly permeable concrete prepared when the weight ratio of microcrystalline cellulose to distearyloxyisopropyl aluminate modified porous silica powder is 1:1.5 has better compressive strength, crack resistance, and permeability.

[0066] The difference between Comparative Example 1 and Example 1 is that microcrystalline cellulose was not added during the preparation of the environmentally friendly permeable concrete. The difference between Comparative Example 2 and Example 1 is that distearyloxyisopropylaluminate modified porous silica powder was not added during the preparation of the environmentally friendly permeable concrete. The difference between Comparative Example 3 and Example 1 is that neither distearyloxyisopropylaluminate modified porous silica powder nor microcrystalline cellulose was added during the preparation of the environmentally friendly permeable concrete. Combining the experimental results of Example 1 and Comparative Examples 1-3, it can be seen that when distearyloxyisopropylaluminate modified porous silica powder and microcrystalline cellulose are used in combination during the preparation of environmentally friendly permeable concrete, the compressive strength, crack resistance, and permeability of the resulting environmentally friendly permeable concrete can be significantly improved. This may be because distearyloxyisopropylaluminate modified porous silica powder and microcrystalline cellulose, when used in combination, each exert their unique effects, jointly promoting the improvement of the performance of the environmentally friendly permeable concrete. Distearate-modified porous silica powder, through special modification treatment, optimizes its porous structure and surface properties, increasing the contact area and interaction force with cement paste. This allows it to better fill the voids within the concrete, improving its density and structural stability, thereby enhancing its compressive strength. Simultaneously, the pore structure of the modified silica powder facilitates rainwater infiltration without compromising permeability; it may even improve permeability efficiency by optimizing the pore structure distribution. Microcrystalline cellulose, as an organic fiber reinforcing material, effectively inhibits the propagation of microcracks within the concrete, enhancing its toughness and crack resistance. The three-dimensional network structure formed by cellulose in the concrete can disperse stress, reducing cracks caused by drying shrinkage or external loads, further ensuring the concrete's durability and integrity. In summary, when these two materials are used in combination, they work together to improve the microstructure and interfacial properties of the concrete, and enhance its internal toughness and ductility, resulting in environmentally friendly permeable concrete that significantly improves compressive strength and crack resistance while maintaining good permeability. The difference between Comparative Example 4 and Example 1 is that, in preparing the environmentally friendly permeable concrete, an equal amount of porous silica powder was used to replace the distearate-modified porous silica powder. According to the experimental data in Table 1, when an equal amount of porous silica powder was used to replace the distearate-modified porous silica powder in the preparation of the environmentally friendly permeable concrete, the compressive strength, crack resistance, and permeability coefficient of the resulting concrete were inferior to those of Example 1. This may be because the distearate-modified porous silica powder plays a crucial role in the environmentally friendly permeable concrete of this application. Firstly, through a unique modification process, it successfully retains the original rich pore structure of the porous silica powder. These pores form effective permeable channels within the concrete, greatly improving the permeability of the concrete, helping to quickly drain surface water, reducing urban flooding pressure, and improving the ecological environment.

[0067] Secondly, the porous silica powder modified with distearyloxyisopropyl aluminate exhibits optimized surface properties and enhanced compatibility with cement paste and other components. This allows it to form a denser and more stable network structure within the concrete, strengthening its overall integrity and significantly improving its compressive strength and durability. Furthermore, the modified porous silica powder, in conjunction with microcrystalline cellulose, optimizes the mechanical properties of permeable concrete, particularly demonstrating excellent crack resistance. This significantly reduces the risk of cracking caused by external loads and environmental factors, extending the service life of the concrete structure. Distearyloxyisopropyl aluminate contains fatty acid groups and aluminate groups. The aluminate groups can hydrolyze with the hydroxyl groups on the surface of the porous silica powder, generating silanols which then condense, forming an organic molecular layer on the silica powder surface. In addition to chemical bonding, the distearyloxy moiety, due to its long-chain hydrocarbon structure, can form a stable physical adsorption layer on the porous silica powder surface through van der Waals forces or hydrophobic effects, increasing the hydrophobicity of the silica powder surface. Improving the hydrophobicity of components such as porous silica fume can, to some extent, prevent excessive water retention within the concrete. This maintains good permeability while enhancing the repulsion of surface moisture, preventing damage to the concrete structure from excessive water penetration and freezing. Permeable concrete is frequently exposed to harsh environments and is susceptible to water erosion, salt crystallization, and freeze-thaw cycles. Improving the hydrophobicity of the filler material helps reduce the intrusion of these harmful substances, thereby enhancing the durability and service life of the concrete. Furthermore, porous silica fume treated with distearate exhibits significantly improved inorganic-organic interface properties, enhancing the interaction with the polymer matrix and reducing phase separation caused by polarity differences between the inorganic filler and the polymer. The modified porous silica fume exhibits better dispersibility in the matrix, contributing to improved mechanical and permeability properties of the concrete.

[0068] In summary, the distearate-modified porous silica powder plays a crucial role in enhancing and improving the environmentally friendly permeable concrete of this invention. It not only improves the permeability of the concrete but also ensures that it has good compressive strength and crack resistance, thus achieving the dual goals of high performance and environmental protection.

[0069] Examples 5-6 Example 5 The difference between this embodiment and Embodiment 1 is that the weight percentages of some components are changed when preparing environmentally friendly permeable concrete. The differences are shown in Table 2.

[0070] Table 2 - Record of Differences Between Examples 5-6 and Example 3 Vinyl acetate resin 8 13 15 Acrylic emulsion 15 27 30 Basalt gravel 200 285 300 enhancer 8 17 20 Water reducing agent 5 13 15 cement 80 120 130 water 40 50 60 microcrystalline cellulose 16 16 16 Distearate-modified porous silica powder 24 24 24 The experimental test results of Examples 5-6 are shown in Table 3.

[0071] Table 3 - Experimental Detection Results of Examples 5-6 Results Analysis: Based on the experimental test results in Table 3, it can be seen that the weight percentages of some components are different when preparing environmentally friendly permeable concrete. Based on the experimental test results in Table 3, it can be seen that the concrete prepared in Example 5 has better overall performance.

[0072] Examples 7-11 Example 7 The difference between Examples 7-11 and Example 5 is that, in preparing environmentally friendly permeable concrete, the weight ratio of microcrystalline cellulose and distearyloxyisopropyl aluminate modified porous silica powder is 1:1.5, and the proportion of the total weight of microcrystalline cellulose and distearyloxyisopropyl aluminate modified porous silica powder in the environmentally friendly permeable concrete is changed, and a better weight ratio is selected.

[0073] In Example 5, the total weight of microcrystalline cellulose and distearate-modified porous silica powder was 40 parts, used in environmentally friendly permeable concrete. The total weight is 565 portions. .

[0074] Therefore, it is not difficult to conclude that in Example 5, the proportion of microcrystalline cellulose (referred to as variable 1) and distearate-modified porous silica powder (referred to as variable 2) in the environmentally friendly permeable concrete (referred to as matrix) is 7.08%.

[0075] The differences between Examples 7-11 and Example 5 are shown in Table 4.

[0076] Percentage = (Variable 1 + Variable 2) / Total weight of the matrix * 100%.

[0077] Table 4 - Differences between Examples 7-11 and Example 5 The experimental test results of Examples 7-11 are shown in Table 5.

[0078] Table 5 - Experimental Detection Results of Examples 7-11 Example 5 68.8 7.7 7.47 Example 7 64.2 7.2 6.72 Example 8 66.3 7.5 6.95 Example 9 69.6 7.9 7.59 Example 10 71.1 8.1 7.68 Example 11 70.4 8.0 7.63 Results Analysis: Based on the experimental results in Table 5, it can be seen that when the total weight of microcrystalline cellulose (referred to as Variable 1) and distearate-modified porous silica powder (referred to as Variable 2) in the environmentally friendly permeable concrete is 7.08-8.70%, the concrete produced exhibits the best overall performance. The optimal overall performance is achieved when the total weight of microcrystalline cellulose (referred to as Variable 1) and distearate-modified porous silica powder (referred to as Variable 2) in the environmentally friendly permeable concrete is 8.30%.

[0079] Examples 12-13 Example 12 The difference between this embodiment and Example 10 is that the preparation parameters of the distearate-modified porous silica powder used in the preparation of environmentally friendly permeable concrete are different. The distearate-modified porous silica powder in this embodiment was prepared by Example 2.

[0080] Example 13 The difference between this embodiment and Example 10 is that the preparation parameters of the distearate-modified porous silica powder used in the preparation of environmentally friendly permeable concrete are different. The distearate-modified porous silica powder in this embodiment was prepared by Example 3.

[0081] The experimental test results of Examples 12-13 are shown in Table 6.

[0082] Table 6 - Experimental Detection Results of Examples 12-13 Results Analysis: The difference between Examples 12-13 and Example 10 is that the preparation methods of the distearate-modified porous silica powder used in the preparation of environmentally friendly permeable concrete are different. According to the experimental test results in Table 6, the concrete prepared by Example 1 has better comprehensive performance.

[0083] Examples 14-15 Example 14 The difference between this embodiment and Embodiment 12 is that, in preparing environmentally friendly permeable concrete, the reinforcing agent is selected from polyester fiber.

[0084] Example 15 The difference between this embodiment and Embodiment 12 is that, in preparing the environmentally friendly permeable concrete, the reinforcing agent is selected from polyester fiber and coconut shell fiber. The weight ratio of polyester fiber to coconut shell fiber is 1:1.

[0085] The experimental test results of Examples 14-15 are shown in Table 7.

[0086] Table 6 - Experimental Detection Results of Examples 14-15 Results Analysis: The difference between Examples 14-15 and Example 12 is that the types of reinforcing agents used in preparing environmentally friendly permeable concrete are different. Combined with the experimental test results in Table 6, it can be seen that the concrete prepared by Example 15 has better comprehensive performance.

[0087] Examples 16-18 Example 16 The difference between this embodiment and Embodiment 15 is that, in preparing environmentally friendly permeable concrete, 5 parts of hydroxypropyl distarch phosphate are also included.

[0088] The preparation method is as follows: S1. Add water-reducing agent and acrylic emulsion to water and stir to mix evenly to obtain a mixture; S2. Mix the remaining raw materials and add them to the concrete mixer and mix evenly. Then add the mixture obtained in step S1 and continue mixing until evenly mixed to obtain environmentally friendly permeable concrete.

[0089] Example 17 The difference between this embodiment and Embodiment 16 is that, in preparing environmentally friendly permeable concrete, 8 parts of hydroxypropyl distarch phosphate are also included.

[0090] Example 18 The difference between this embodiment and Embodiment 16 is that, in preparing environmentally friendly permeable concrete, 10 parts of hydroxypropyl distarch phosphate are also included.

[0091] The experimental test results of Examples 16-18 are shown in Table 7.

[0092] Table 6 - Experimental Detection Results of Examples 16-18 Results Analysis: The difference between Examples 16-18 and Example 15 lies in the fact that hydroxypropyl distarch phosphate was also included in the raw materials for preparing environmentally friendly permeable concrete. Combined with the experimental results in Table 6, it can be seen that the addition of hydroxypropyl distarch phosphate significantly improves the crack resistance of the resulting concrete. This may be due to several factors: First, the addition of hydroxypropyl distarch phosphate improves the internal moisture distribution of the concrete, preventing premature water loss and poor hardening, thus improving the early strength and later stability of the concrete. Second, hydroxypropyl distarch phosphate effectively fills the pores inside the concrete, increasing its density and thereby improving its impermeability, freeze-thaw resistance, and chemical corrosion resistance, extending the service life of permeable concrete pavements and permeable pipes. Third, hydroxypropyl distarch phosphate improves the fluidity of the concrete mix during mixing and pouring, facilitating construction operations, and also promotes the formation of a more uniform and fine microstructure within the concrete, further enhancing its permeability. Fourthly, hydroxypropyl distarch phosphate, as a biodegradable and environmentally friendly additive, aligns with the development trend of green building materials and helps promote the sustainable development of the construction industry. Therefore, through this technical solution, environmentally friendly permeable concrete maintains its original permeability while improving its overall performance, resulting in superior performance in practical applications.

[0093] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An environmentally friendly permeable concrete, characterized in that, The environmentally friendly permeable concrete comprises the following raw materials in parts by weight: 8-15 parts of vinyl acetate resin; 15-30 parts of acrylic emulsion; 200-300 pieces of basalt gravel; 8-20 parts of reinforcing agent; 5-15 parts of water-reducing agent; 80-130 parts cement; 40-60 parts water; 10-20 parts of microcrystalline cellulose; 15-30 parts of distearyloxyisopropyl aluminate modified porous silica powder; The preparation method of the distearate-modified porous silica powder includes the following steps: Distearate isopropyl aluminate and porous silica powder are mixed at a weight ratio of (1-5):(15-25) and dispersed in a solution of water and ethanol at a volume ratio of 1:

9. The mixture is ultrasonically treated at 50°C for 1-3 hours, then filtered and dried at 60°C-70°C for 2-3 hours to obtain distearate isopropyl aluminate modified porous silica powder.

2. The environmentally friendly permeable concrete according to claim 1, characterized in that, The weight ratio of the microcrystalline cellulose to the distearate-modified porous silica powder is 1:(1.3-1.8).

3. The environmentally friendly permeable concrete according to claim 1, characterized in that, The weight ratio of the microcrystalline cellulose to the distearate-modified porous silica powder is 1:1.

5.

4. The environmentally friendly permeable concrete according to claim 1, characterized in that, The reinforcing agent is selected from at least one of coconut shell fiber and polyester fiber.

5. The environmentally friendly permeable concrete according to claim 4, characterized in that, The reinforcing agent comprises coconut shell fiber and polyester fiber; wherein the weight ratio of the coconut shell fiber and polyester fiber is 1:

1.

6. The environmentally friendly permeable concrete according to claim 1, characterized in that, The water-reducing agent is selected from polycarboxylate water-reducing agents.

7. The environmentally friendly permeable concrete according to claim 1, characterized in that, The environmentally friendly permeable concrete also includes 5-10 parts of hydroxypropyl distarch phosphate.

8. A method for preparing environmentally friendly permeable concrete according to any one of claims 1-7, characterized in that, The preparation method includes the following steps: S1. Add water-reducing agent and acrylic emulsion to water and stir to mix evenly to obtain a mixture; S2. Mix the remaining raw materials and add them to a concrete mixer and mix evenly. Then add the mixture obtained in step S1 and continue mixing until evenly mixed to obtain the environmentally friendly permeable concrete.

9. The application of the environmentally friendly permeable concrete according to any one of claims 1-7 in the preparation of permeable pavement and permeable pipe.

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