High-strength pervious concrete and preparation method thereof

Abstract

The invention relates to the technical field of concrete, and discloses high-strength pervious concrete and a preparation method thereof.The high-strength pervious concrete is prepared from cement, aggregate, water and a functional additive; the functional additive comprises a component A, a silane-terminated polyether emulsion, a component B, a mixture of crystalline alumina micropowder and anhydrous gypsum, and a component C, a compound of tartaric acid and triethanolamine. The preparation method adopts a two-step stirring process: firstly, stirring the aggregate, the component A and part of water at a low speed, and pre-constructing a flexible chemical bonding layer on the surface of the aggregate; and adding the cement, the component B, the component C and the rest of the mixing water, and carrying out high-speed stirring molding. According to the method, the component A forms a chemically bonded flexible interface on the surface of the aggregate, so that the interface bonding strength is improved, and interface crack initiation is inhibited; and the component B generates a three-dimensional fiber network in situ in a set cement matrix, so that the expansion of cracks in the matrix is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete, in particular to a high-strength pervious concrete and a preparation method thereof. BACKGROUND

[0002] As a kind of building material with high porosity and good water permeability, pervious concrete has been widely used in urban sidewalks, squares, parking lots and other fields to alleviate urban waterlogging and improve ecological environment. However, compared with traditional concrete, pervious concrete has the inherent defect of low mechanical properties (such as compressive strength and flexural strength) due to its unique open-graded skeleton structure, which greatly limits its application range and durability.

[0003] The insufficient mechanical properties of existing pervious concrete mainly come from two weak links inside. First, the strength of traditional physical bonding at the interface between aggregate and cement stone is low. Under the action of load, this interface becomes a weak point of stress concentration, which is prone to initiate and rapidly expand microcracks, leading to brittle failure of the material. Second, the fracture toughness of the cement stone matrix itself is low due to its own pore structure. Although some technical solutions attempt to enhance the matrix by adding fibers and other ways, there are usually problems such as uneven dispersion of fibers and limited enhancement effect, which cannot effectively form a three-dimensional anti-cracking network throughout the matrix.

[0004] In addition, the existing pervious concrete preparation process mostly uses one-step mixing, i.e. all raw materials are mixed at one time. This method cannot pre-treat the surface of the aggregate before the cement hydration reaction to optimize the interface structure between the aggregate and the cement stone. This limitation in the preparation process makes it difficult for high-performance functional materials to fully exert their effectiveness, resulting in the inability of interface enhancement and matrix enhancement to effectively cooperate, ultimately limiting the improvement of the overall mechanical properties of pervious concrete. Therefore, there is an urgent need in the industry for a technical solution that can effectively improve the mechanical properties of pervious concrete from the interface and matrix dimensions, combined with a specific preparation process. SUMMARY

[0005] The purpose of the present application is to provide a high-strength pervious concrete and a preparation method thereof, which solves the problem of low overall mechanical properties and limited application range caused by the weak interface bonding between aggregate and cement stone, the insufficient fracture toughness of the matrix itself, and the inability of traditional one-step preparation process to achieve synergistic enhancement of the two.

[0006] To achieve the above purpose, the present application realizes the following technical scheme: a high-strength pervious concrete and a preparation method thereof, the present application adopts the following technical scheme: A high-strength pervious concrete is prepared from the following components by weight percentage: Silicate cement: 14.8%-16.5%; Sulphoaluminate cement: 1.4%-2.2%; Aggregate: 73.7%-76.7%; Water: 6.4%-6.6%; Functional additive: 0.6%-1.2%; The functional additive comprises A component, B component and C component; The A component is a terminal silyl polyether emulsion; The B component is a mixture of crystalline alumina micropowder and anhydrous gypsum; The C component is a complex of tartaric acid and triethanolamine.

[0007] In the present technical solution, the mechanism of action of each component is as follows: The A component (terminal silyl polyether emulsion) forms a flexible polymer film on the surface of the aggregate. The silane groups of the terminal silyl polyether undergo dehydration condensation with the hydroxyl groups on the surface of the aggregate, forming Si-O-Si chemical bonds, which achieve chemical bonding of the polymer film to the aggregate. The flexible polyether backbone of the terminal silyl polyether gives the interfacial layer the ability to absorb and dissipate stress.

[0008] The B component undergoes a hydration reaction with the sulphoaluminate cement and water, generating needle-shaped ettringite crystals in situ within the cement stone matrix. The needle-shaped ettringite crystals are distributed three-dimensionally and randomly in the matrix, forming a micro-reinforcing network that inhibits the propagation of micro-cracks within the matrix.

[0009] The C component has a dual function. Firstly, the tartaric acid in the C component has a retarding effect on the initial hydration reaction of the sulphoaluminate cement, slowing the rate of ettringite crystal formation, providing operating time for the mixture, and helping to form crystals of a smaller size. Secondly, the triethanolamine in the C component, after the retarding effect ends, stimulates and accelerates the hydration reaction, and at the same time catalyzes the further condensation of residual silanol groups that may be present in the A component, enhancing the bonding of the flexible layer formed by the A component to the subsequent cement stone matrix.

[0010] In some embodiments, in the functional additive, the mass ratio between the A component, the B component and the C component by solid content is (2.5-3.5):(1.0-1.5):1.0.

[0011] In some embodiments, the terminal silyl polyether contained in the A component is prepared from the reaction of polypropylene glycol, isophorone diisocyanate and (3-aminopropyl)triethoxysilane.

[0012] In some embodiments, the B component consists of the following components by weight percentage: crystalline alumina powder: 31.3%-35.7%; anhydrous gypsum: 64.3%-68.7%.

[0013] In some embodiments, the C component consists of the following components by weight percentage: tartaric acid: 28.6%-40.0%; triethanolamine: 60.0%-71.4%.

[0014] In some embodiments, the Portland cement is of P.O 42.5 grade, and the sulfoaluminate cement is of 42.5 grade.

[0015] In some embodiments, the aggregate is continuously graded gravel with a particle size of 5mm to 15mm, and the material of the continuously graded gravel is selected from the group consisting of basalt and granite.

[0016] In some embodiments, the average particle size of the crystalline alumina powder in the B component is less than or equal to 5μm.

[0017] In some embodiments, the A component is an emulsion with a solid content of 50%-55%, which is prepared by emulsifying a terminal silyl polyether base glue under the action of a non-ionic surfactant.

[0018] The second aspect of the present application provides a preparation method of high-strength water-permeable concrete.

[0019] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: A preparation method of high-strength water-permeable concrete, comprising the following steps: S1, put all aggregates into a horizontal shaft forced mixer, put in 65%-75% of the total water and all A components, and carry out low-speed stirring at a speed of 80-100rpm, the stirring time is 3.0-4.0 minutes, to obtain aggregates coated with a flexible layer; this step makes the terminal silyl polyether in the A component spread on the surface of the aggregate, and completes the chemical bonding reaction with the surface of the aggregate.

[0020] S2, keep the horizontal shaft forced mixer running, put all Portland cement, sulfoaluminate cement, B component and C component into the aggregates coated with a flexible layer obtained in S1 step in the mixer, and finally put in the remaining mixing water, increase the stirring speed of the mixer to 200-250rpm to carry out high-speed stirring, the stirring time is 4.0-6.0 minutes, to obtain a concrete mixture; this step makes the cementitious materials and each functional component uniformly dispersed, and at the same time, the C component starts to control the hydration reaction process in the system.

[0021] S3, discharging the concrete mixture obtained in the step S2 and loading into a mold, vibrating the mold loaded with the concrete mixture by using a vibrating table, the vibrating frequency is 40-50 Hz, the vibrating time is 30-60 seconds; moving the vibrated mold into a standard curing room, curing for 22-26 hours under the condition that the temperature is 20±2℃ and the relative humidity is not less than 95%, then demolding, continuing to cure the demolded test piece under the standard curing condition until the specified age, thereby preparing the high-strength pervious concrete; in this step, the cement hydration and the formation of the ettringite micro-enhanced network are carried out synchronously, and finally a dense hardened structure is obtained.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. The terminal silane group polyether of the present application constructs a flexible interface layer on the surface of the aggregate, the silane group in the flexible interface layer produces chemical bond with the aggregate, and the flexible characteristics of the polymer chain help to dissipate stress, improve the interfacial bonding strength and toughness between the aggregate and the cement stone matrix, and reduce the possibility of crack initiation in the interface area.

[0023] 2. The present application introduces a mixture of sulphoaluminate cement and crystalline alumina micropowder and anhydrous gypsum, which promotes the in-situ generation of three-dimensional randomly distributed needle-shaped ettringite whiskers in the interior of the cement stone matrix during cement hydration, forming a micro-enhanced network that hinders the expansion of micro-cracks in the matrix, which helps to improve the fracture toughness and crack resistance of the cement stone matrix itself.

[0024] 3. The present application uses a tartaric acid and triethanolamine complex, which exerts kinetic regulation on the generation process of ettringite whiskers, first inhibiting and then promoting, which helps to obtain a uniformly distributed and optimized micro-enhanced structure, and promotes the combination of the flexible interface layer and the cement matrix, associating the two technical means of interface enhancement and matrix enhancement to jointly improve the overall mechanical properties of the pervious concrete. DETAILED DESCRIPTION

[0025] The present application will be further described in detail below in combination with examples, comparative examples and test examples.

[0026] Examples 1-3: Example 1: Preparation of functional additives: Preparation of component A, terminal silane group polyether (STPE) emulsion: Put 2000 g of polypropylene glycol (molecular weight 2000 g / mol) into a four-necked flask equipped with a mechanical stirrer, a thermometer and a condenser, and dehydrate under vacuum at 110℃ for 2 hours. Cool down to 80℃, add 409.8 g of isophorone diisocyanate, and react under nitrogen protection for 3 hours to obtain an NCO-terminated polyurethane prepolymer. Cool down the prepolymer to 60℃, and drop 183.8 g of (3-aminopropyl)triethoxysilane into it, and continue to react for 2 hours to obtain a silane-terminated polyether primer. Cool down the primer to room temperature, and mix it with 150 g of alkylphenol polyoxyethylene ether and 2450 g of deionized water in a high-speed shearing emulsifier to obtain an A component emulsion with a solid content of 50%.

[0027] B component: Put 31.3 parts by weight of crystalline alumina powder and 68.7 parts by weight of anhydrous gypsum into a V-type mixer, mix at medium speed for 30 minutes, and seal after discharging to obtain a B component.

[0028] C component: Mix 28.6 parts by weight of L-(+)-tartaric acid powder and 71.4 parts by weight of triethanolamine in a glass container, stir with a stirring rod until a uniform solution is formed, and seal to obtain a C component.

[0029] Preparation of high-strength pervious concrete: Component ratio: The weight percentage of each component of the high-strength pervious concrete prepared in this Example 1 is as follows: Portland cement: 14.8% Sulphoaluminate cement: 1.4% Basalt aggregate: 76.8% Water: 6.4% Functional additives: 0.6% The mass ratio of A component (based on solid content), B component and C component in the functional additives is 2.5:1.0:1.0.

[0030] Preparation process: The preparation method comprises the following steps: Building a flexible chemical bonding layer: put all the basalt aggregate, 65% of the total water (calculated according to the above ratio) and all the A component into a horizontal shaft forced mixer, and stir at a low speed of 80 rpm for 3.0 minutes.

[0031] Filling and regulating: keep the horizontal shaft forced mixer running, and put all the Portland cement, sulphoaluminate cement, B component and C component into the material in the mixer, and finally put the remaining mixing water into the mixer, and increase the stirring speed of the mixer to 200 rpm for high-speed stirring for 4.0 minutes to obtain a concrete mixture.

[0032] Molding and curing: the obtained concrete mixture was discharged and loaded into a 100 mm x 100 mm x 100 mm cubic test mold, and the test mold loaded with the concrete mixture was vibrated on a vibration table, with a vibration frequency of 40 Hz and a vibration time of 30 seconds. The vibrated test mold was moved into a standard curing room, and after curing at a temperature of 20°C and a relative humidity of 95% for 22 hours, it was demolded, and the demolded test piece was continuously cured under the standard curing conditions until the 28-day age.

[0033] Example 2: Preparation of functional additives: Preparation of component A, silane-terminated polyether (STPE) emulsion: 2000 g of polypropylene glycol (molecular weight 2000 g / mol) was placed in a four-necked flask equipped with a mechanical stirrer, a thermometer and a condenser, and dehydrated under vacuum at 110°C for 2 hours. The temperature was lowered to 80°C, and 409.8 g of isophorone diisocyanate was added, and the reaction was carried out under nitrogen protection for 3 hours to obtain an NCO-terminated polyurethane prepolymer. The prepolymer was cooled to 60°C, and 183.8 g of (3-aminopropyl)triethoxysilane was added dropwise, and the reaction was continued for 2 hours to obtain a silane-terminated polyether (STPE) original glue. The original glue was cooled to room temperature, mixed with 151 g of alkylphenol polyoxyethylene ether and 2196 g of deionized water in a high-speed shearing emulsifier to prepare an emulsion of component A with a solid content of 52.5%.

[0034] Preparation of component B: 33.5 parts by weight of crystalline alumina powder and 66.5 parts by weight of anhydrous gypsum were put into a V-type mixer and mixed at medium speed for 30 minutes, and after discharging, they were sealed and stored to obtain component B.

[0035] Preparation of component C: 34.3 parts by weight of L-(+)-tartaric acid powder and 65.7 parts by weight of triethanolamine were mixed in a glass container with a stirring rod until a uniform solution was formed, and sealed and stored to obtain component C.

[0036] Preparation of high-strength pervious concrete: Component proportioning: The weight percentage of each component of the high-strength pervious concrete prepared in this example 2 is as follows: Portland cement: 15.7% Sulphoaluminate cement: 1.8% Basalt aggregate: 75.2% Water: 6.5% Functional additives: 0.8% The mass ratio of the A component (by solid content), the B component and the C component in the functional additive is 3.0:1.25:1.0.

[0037] Preparation process: The preparation method comprises the following steps: Building a flexible chemical bonding layer: put all basalt macadam into a horizontal shaft forced mixer, put in 70% of the total water (calculated according to the above ratio) and all A components, and carry out low-speed stirring at a speed of 90 rpm, and the stirring time is 3.5 minutes.

[0038] Filling and regulating: keep the horizontal shaft forced mixer running, put all the Portland cement, sulfoaluminate cement, B component and C component into the material in the mixer, and finally put in the remaining mixing water, increase the stirring speed of the mixer to 225 rpm for high-speed stirring, and the stirring time is 5.0 minutes, to obtain a concrete mixture.

[0039] Molding and curing: the obtained concrete mixture is discharged and loaded into a 100mmx100mmx100mm cubic test mold, and the test mold loaded with the concrete mixture is vibrated on a vibration table, the vibration frequency is 45Hz, and the vibration time is 45 seconds. The vibrated test mold is moved into a standard curing room, and after curing at a temperature of 20℃ and a relative humidity of 95% for 24 hours, the test piece is demolded, and the demolded test piece is continuously cured under the standard curing conditions until the 28-day age.

[0040] Example 3: Preparation of the functional additive: Preparation of the A component, silane-terminated polyether (STPE) emulsion: Put 2000g of polypropylene glycol (molecular weight 2000g / mol) into a four-necked flask equipped with a mechanical stirrer, a thermometer and a condenser, and dehydrate at 110℃ for 2 hours. Cool to 80℃, add 409.8g of isophorone diisocyanate, and react for 3 hours under nitrogen protection to obtain an NCO-terminated polyurethane prepolymer. Cool the prepolymer to 60℃, add 183.8g of (3-aminopropyl) triethoxysilane dropwise, and continue to react for 2 hours to obtain a silane-terminated polyether primer. Cool the primer to room temperature, mix with 152g of alkylphenol polyoxyethylene ether and 2246g of deionized water in a high-speed shearing emulsifier to prepare an A component emulsion with a solid content of 55%.

[0041] Preparation of the B component: Put 35.7 parts by weight of crystalline alumina powder and 64.3 parts by weight of anhydrous gypsum into a V-type mixer, mix at medium speed for 30 minutes, and seal after discharging to obtain the B component.

[0042] Preparation of the C component: 40.0 parts by weight of L-(+)-tartaric acid powder and 60.0 parts by weight of triethanolamine were mixed in a glass container and stirred with a stirring rod until a homogeneous solution was formed. The mixture was then sealed and stored to obtain component C.

[0043] Preparation of high-strength permeable concrete: Group allocation ratio: The high-strength permeable concrete prepared in Example 3 has the following weight percentages of its components: Silicate cement: 16.5% Sulfoaluminate cement: 2.2% Basalt gravel: 73.5% Water: 6.6% Functional additives: 1.2% In the functional additive, the mass ratio of component A (by solid content), component B, and component C is 3.5:1.5:1.0.

[0044] Preparation process: The preparation method includes the following steps: Constructing a flexible chemical bonded layer: Put all the basalt crushed stone into a horizontal shaft forced mixer, add 75% of the total water volume (calculated according to the above ratio) and all of component A, and stir at a low speed of 100 rpm for 4.0 minutes.

[0045] Filling and Controlling: Keep the horizontal shaft forced mixer running, add all silicate cement, sulfoaluminate cement, component B, and component C into the material inside the machine, and finally add the remaining mixing water. Increase the mixer speed to 250 rpm for high-speed mixing, and mix for 6.0 minutes to obtain concrete mixture.

[0046] Molding and Curing: The obtained concrete mixture was discharged and placed into 100mm×100mm×100mm cubic molds. The molds containing the concrete mixture were vibrated using a vibrating table at a frequency of 50Hz for 60 seconds. The vibrated molds were then transferred to a standard curing room and cured for 26 hours at 22℃ and a relative humidity of not less than 95%. After demolding, the specimens continued to cure under the same standard curing conditions for 28 days.

[0047] Comparative Examples 1-5: Comparative Example 1: Compared with Example 1, the difference is that no functional additives are added, and their weight parts are replaced by an equal amount of silicate cement; during preparation, the conventional one-step mixing method is adopted, in which all dry materials are mixed evenly and then all water is added at once, while the rest are the same.

[0048] Comparative Example 2: Compared with Example 1, the difference is that the functional additive does not contain component A, and its weight is supplemented by components B and C in the original ratio (1.0:1.0), while the rest are the same.

[0049] Comparative Example 3: Compared with Example 1, the difference is that the functional additive does not contain component B, and its weight is supplemented by component A (by solid content) and component C in the original ratio (2.5:1.0), while the rest are the same.

[0050] Comparative Example 4: Compared with Example 1, the difference is that the functional additive does not contain component C, and its weight is supplemented by component A (by solid content) and component B in the original ratio (2.5:1.0), while the rest are the same.

[0051] Comparative Example 5: Compared with Example 1, the difference is that the preparation process adopts a one-step mixing method, that is, all the basalt crushed stone, silicate cement, sulfoaluminate cement and component B are put into the mixer and dry mixed evenly, and then all the mixing water, component A and component C are added at one time and mixed. The rest are the same.

[0052] Test Example 1: Test method: Permeability coefficient test: The test was conducted according to standard CJJ / T135-2009, "Technical Specification for Permeable Cement Concrete Pavement". Core specimens measuring 100mm × 100mm × 50mm were cut from cured cubic specimens. The specimens were placed in a permeability coefficient testing device, and the gap between the specimen's side and the instrument's inner wall was sealed with sealant. The constant head method was used for testing, and the amount of water permeating the specimen within a specified head pressure difference over a certain period was recorded. The permeability coefficient was then calculated using the formula.

[0053] Compressive strength test: The test was conducted according to standard GB / T50081-2019, "Standard for Test Methods of Physical and Mechanical Properties of Concrete". Three 100mm×100mm×100mm cube specimens, cured to 28 days of age, were used as a group. The specimen was placed in the center of the compression testing machine and continuously and uniformly loaded at a loading rate of 0.5 MPa / s until the specimen failed. The peak load was recorded. The arithmetic mean of the three measured values ​​was taken as the compressive strength value of the group of specimens.

[0054] Flexural strength test: According to the standard GB / T50081-2019 "Standard for Testing Methods of Physical and Mechanical Properties of Concrete". The same component proportion and preparation process as the cube specimen were used to form beam-shaped specimens with a size of 100mmx100mmx400mm. The specimens were standard cured for 28 days. The test used a four-point bending loading method with a support point distance of 300mm. The specimens were continuously and uniformly loaded at a rate of 100N / s until they fractured, and the peak load was recorded. The arithmetic mean of the values of three specimens was taken as the flexural strength value of the group of specimens.

[0055] Test results and analysis The concrete specimens prepared in Examples 1-3 and Comparative Examples 1-5 were tested for performance according to the aforementioned method, and the results are summarized in Table 1.

[0056] Table 1. Performance test results of examples and comparative examples As can be seen from the test data in Table 1, the water permeability coefficients of Examples 1, 2 and 3 are basically the same as those of the comparative examples, indicating that the technical solution maintains the original high water permeability of the material while improving the mechanical properties. At the same time, the 28-day compressive strength and 28-day flexural strength values of Examples 1-3 are significantly higher than those of all comparative examples.

[0057] The two-step preparation process used in the technical solution forms a flexible interface layer on the surface of the aggregate in the first step, with the end-silane group polyether in component A and component C acting together. This interface layer forms a chemical bond by reacting with the hydroxyl groups on the surface of the aggregate through the silane groups. This structure changes the physical contact interface between the aggregate and the cement stone matrix, which helps to achieve effective stress transfer. At the same time, the flexible characteristics of the interface layer can dissipate part of the stress concentration and inhibit the initiation of microcracks in the interface area. This is one of the reasons why the mechanical property test values of the examples are higher than those of Comparative Example 2, which lacks component A, and Comparative Example 5, which fails to form the pre-set interface layer.

[0058] In the second step, component B generates three-dimensionally distributed needle-shaped ettringite whiskers in situ on the surface of the pores and voids in the cement stone matrix under the regulation of component C on the cement hydration process. This whisker structure plays a role in hindering the propagation of microcracks in the matrix. When the existing microcracks in the matrix propagate under the action of load and encounter the whiskers, the propagation path is blocked, and additional energy is required to continue, thereby improving the fracture toughness of the cement stone matrix itself. This is the reason why the mechanical property test values of the examples are higher than those of Comparative Example 3, which lacks component B.

[0059] The technical scheme combines the interface enhancement and matrix enhancement. Under external load, the flexible interface constructed by chemical bonding effectively inhibits the initial generation of cracks in the structural weak area, and the fiber network generated in situ in the matrix further prevents the extension and penetration of the generated cracks in the matrix. The synchronous regulation of component C on the interface reaction and the hydration process is the condition for ensuring the effective formation and synergistic effect of the two enhancement structures. The lack of any functional component or the use of a one-step process that fails to form a pre-constructed interface layer cannot achieve the synergistic enhancement of the interface and the matrix, and the mechanical property test results are lower than those of the embodiments of the technical scheme. The data verifies that the technical scheme effectively improves the mechanical properties by combining technical means without significantly affecting the water permeability.

Claims

1. A high-strength permeable concrete, characterized in that, Prepared from the following components by weight percentage: Silicate cement: 14.8%-16.5%; Sulfoaluminate cement: 1.4%-2.2%; Aggregate: 73.7%-76.7%; Water: 6.4%-6.6%; Functional additives: 0.6%-1.2%; The functional additives include components A, B, and C; Component A is a silane-terminated polyether emulsion; Component B is composed of crystalline alumina micro powder and anhydrous gypsum; Component C is a compound of tartaric acid and triethanolamine.

2. The high-strength permeable concrete according to claim 1, characterized in that, In the functional additive, the mass ratio of component A, component B, and component C, based on solid content, is (2.5-3.5):(1.0-1.5):1.

0.

3. The high-strength permeable concrete according to claim 1, characterized in that, The terminal silyl polyether contained in component A is prepared by reacting polypropylene glycol, isophorone diisocyanate and (3-aminopropyl)triethoxysilane.

4. The high-strength permeable concrete according to claim 1, characterized in that, Component B consists of the following components by weight percentage: Crystalline alumina micro powder: 31.3%-35.7%; Anhydrous gypsum: 64.3%-68.7%.

5. The high-strength permeable concrete according to claim 1, characterized in that, Component C consists of the following components by weight percentage: Tartaric acid: 28.57%-40%; Triethanolamine: 60%-71.43%.

6. The high-strength permeable concrete according to claim 1, characterized in that, The silicate cement is grade P.O42.5, and the sulfoaluminate cement is grade 42.

5.

7. The high-strength permeable concrete according to claim 1, characterized in that, The aggregate is continuously graded crushed stone with a particle size of 5mm to 15mm, and the material of the continuously graded crushed stone is selected from the group consisting of basalt and granite.

8. The high-strength permeable concrete according to claim 1, characterized in that, The average particle size of the crystalline alumina micropowder in component B is less than or equal to 5 μm.

9. A high-strength permeable concrete according to claim 1, characterized in that, Component A is an emulsion with a solid content of 50%-55%, which is prepared by emulsifying terminal silane polyether gel under the action of a nonionic surfactant.

10. A method for preparing the high-strength permeable concrete according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Put all the aggregate into a horizontal shaft forced mixer, add 65%-75% of the total water and all of component A, and mix at a low speed of 80-100 rpm for 3.0-4.0 minutes to obtain aggregate with a flexible layer on the surface. S2. Keep the horizontal shaft forced mixer running, add all the silicate cement, sulfoaluminate cement, component B, and component C to the aggregate with a flexible layer on the surface obtained in step S1, and finally add the remaining mixing water. Increase the mixer speed to 200-250 rpm for high-speed mixing for 4.0-6.0 minutes to obtain the concrete mixture. S3. Discharge the concrete mixture obtained in step S2 and load it into a mold. Vibrate the mold containing the concrete mixture using a vibrating table at a frequency of 40-50 Hz for 30-60 seconds. Move the vibrated mold into a standard curing room and cure it for 22-26 hours at a temperature of 20±2℃ and a relative humidity of not less than 95%. Demold the specimen and continue to cure it under the standard curing conditions until the specified age to obtain the high-strength permeable concrete.

Images