Preparation method of cement-based water-permeable bricks with yellow river sediment sand aggregate

Abstract

The application discloses a preparation method of a Yellow River sediment sand cement-based water-permeable brick, which comprises the following steps: (1) uniformly mixing Yellow River sediment sand, municipal sludge, chopped basalt fiber and diluted molasses liquid, granulating, drying and sintering to obtain water-permeable coarse aggregate; (2) adding pseudo-wollastonite powder and red brick micro powder into water glass, stirring to form a slurry, adding the water-permeable coarse aggregate into the slurry to perform surface coating, separating the coarse aggregate, carbonizing the coarse aggregate under heating, drying the obtained coarse aggregate to obtain modified water-permeable coarse aggregate; and (3) uniformly mixing cement components, waste red brick coarse aggregate, modified water-permeable coarse aggregate, glass powder, fiber and water, pouring the obtained slurry into a mold to perform curing. The application effectively overcomes the adverse effect of high mud content of the Yellow River sediment sand on the performance of the water-permeable brick, and is helpful to promote the resource utilization of the Yellow River sediment sand.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cement-based water-permeable brick preparation, and particularly relates to a preparation method of cement-based water-permeable brick of Yellow River sedimentary sand aggregate. BACKGROUND

[0002] The information disclosed in this Background section is only for the purpose of increasing an understanding of the general background of the application and does not necessarily constitute an admission by the patent applicant or the patent owner that this information constitutes prior art.

[0003] It is known that the Yellow River in China is a river with a large amount of sediment, and the annual sediment transport amount thereof is as high as 1.6 billion tons. About 400 million tons of Yellow River sedimentary sand is deposited in the lower reaches of the river bed every year, and forms a man-made desert after long-term accumulation. For a long time, sand control is the key to promoting ecological protection in the Yellow River Basin, and reducing the Yellow River sedimentary sand in the lower reaches is the most important.

[0004] The Yellow River sedimentary sand is mainly composed of aluminosilicate and is a kind of rich natural resource. As a main component of concrete building materials, sand has a huge demand in local economic development. If the Yellow River sedimentary sand is used for the preparation of concrete materials, it is beneficial to promote the large-scale utilization of this natural resource and solve the problem of sedimentation of the Yellow River sedimentary sand. However, the mud content in the Yellow River sedimentary sand is usually between 6% and 20%, which is much higher than that in ordinary river sand, which will lead to the deterioration of the mechanical properties of the prepared concrete materials. In addition, the Yellow River sedimentary sand has been eroded by water flow for a long time, and the surface is smoother, which is not conducive to the formation of mechanical interlocking in the prepared concrete materials, resulting in a decrease in mechanical properties. For cement-based water-permeable bricks, the strength thereof is lower than that of general concrete structures due to the presence of many pores, and the influence of the high mud content in the Yellow River sedimentary sand will lead to insufficient strength of the water-permeable bricks, a decrease in service life, and an increase in maintenance frequency and cost in the later period. SUMMARY

[0005] In view of the above problems, the present application provides a preparation method of cement-based water-permeable brick of Yellow River sedimentary sand aggregate, which converts the Yellow River sedimentary sand into coarse aggregate with water permeability, effectively overcoming the adverse effects on the mechanical properties of the water-permeable bricks. Specifically, the technical scheme of the present application is as follows.

[0006] A preparation method of cement-based water-permeable brick of Yellow River sedimentary sand aggregate, comprising the following steps:

[0007] (1) The Yellow River sedimentary sand, municipal sludge, chopped basalt fiber and diluted molasses solution are uniformly mixed, then the obtained granules are dried, and after completion, preheating is performed, then sintering treatment is performed, and the water-permeable coarse aggregate is obtained after cooling, which is ready for use.

[0008] (2) adding pseudo-wollastonite powder and red brick micro-powder into sodium silicate to stir uniformly to form a slurry, then adding the water-permeable coarse aggregate into the slurry to perform surface coating, then separating the coarse aggregate, and performing carbonization treatment under heating conditions, and after completion, drying the obtained aggregate to obtain the modified water-permeable coarse aggregate, which is ready for use.

[0009] (3) taking the following raw materials: cement component, waste red brick coarse aggregate, modified water-permeable coarse aggregate, glass powder, fiber, and water reducing agent, mixing the above raw materials with water uniformly, then pouring the obtained slurry into a mold to perform curing, and thus the Yellow River sediment sand cement-based water-permeable brick is obtained.

[0010] Further, in step (1), the ratio of the Yellow River sediment sand, municipal sludge, chopped basalt fiber, and diluted molasses liquid is 240-300 parts by weight: 510-625 parts by weight: 25-48 parts by weight: 120-150 parts by weight. Optionally, the length of the chopped basalt fiber is 1-3 mm.

[0011] Further, in step (1), the diluted molasses liquid is obtained by mixing water and molasses in a mass ratio of 1:2.2-3.

[0012] Further, in step (1), the drying temperature is 50-70°C, and the time is 30-60 min.

[0013] Further, in step (1), the preheating temperature is 350-420°C, and the time is 10-20 min.

[0014] Further, in step (1), the sintering treatment temperature is 1200-1400°C, and the time is 20-30 min.

[0015] Further, in step (1), the particle size of the water-permeable coarse aggregate is 10-20 mm.

[0016] Further, in step (2), the ratio of the pseudo-wollastonite powder, red brick micro-powder, and sodium silicate is 1-1.3 g: 3.4-4.1 g: 7.5-9.5 g, and the mass fraction of the sodium silicate is 15-25%. Optionally, the fineness of the pseudo-wollastonite powder is 300-500 mesh. The fineness of the red brick micro-powder is 100-150 mesh.

[0017] Further, in step (2), the carbonization treatment is performed in a carbonization box, in which the relative humidity is maintained at 95-99%, and the volume ratio of carbon dioxide is 15-20%.

[0018] Further, in step (2), the heating temperature is 60-70°C, and the carbonization treatment time is 2-2.5 hours.

[0019] Furthermore, in step (2), the drying temperature is 180-220° C., and the drying time is 1-1.5 hours.

[0020] Furthermore, in step (3), the proportions of the components in the raw materials are: 700-780 parts by weight of cement component, 1060-1220 parts by weight of waste red brick coarse aggregate, 2160-2400 parts by weight of modified permeable coarse aggregate, 90-100 parts by weight of glass powder, 55-80 parts by weight of fiber, and 11-17 parts by weight of water reducer.

[0021] Furthermore, in step (3), water is added according to a water-cement ratio of 0.38 to 0.45.

[0022] Furthermore, in step (3), the fineness of the glass powder is 400-500 mesh. Optionally, the particle size of the waste red brick coarse aggregate is 5-15 mm.

[0023] Furthermore, in step (3), the fibers include one or more of basalt fibers, polyethylene fibers, polypropylene fibers, polyacrylonitrile fibers, etc. Optionally, the length of the fibers is 5 to 30 mm.

[0024] Furthermore, in step (3), the water reducer includes one or more of a polycarboxylic acid water reducer, a naphthalene water reducer, a lignin sulfonate water reducer, and the like.

[0025] Furthermore, in step (3), the curing method is natural curing at room temperature for 21 to 28 days.

[0026] Compared with the prior art, the technical scheme of the present application has at least the following beneficial effects: the present application sinters the granules made of the Yellow River sediment sand, municipal sludge, and molasses short basalt fiber. In this process, the organic matter contained in the municipal sludge and the molasses are removed under the action of high temperature to form a porous structure, and the Yellow River sediment sand and the short basalt fiber are solidified in the porous structure to form a good water-permeable coarse aggregate with mechanical properties, effectively overcoming the adverse effects of the high mud content of the Yellow River sediment sand on the mechanical properties of the water-permeable brick. At the same time, the resource utilization of industrial waste such as municipal sludge and molasses is realized. Further, the present application coats the surface of the water-permeable coarse aggregate with a coating layer formed by pseudowollastonite powder, red brick micro powder, and water glass, and then performs carbonization treatment, so as to promote the reaction of the pseudowollastonite to form nano-silicon dioxide, and at the same time, convert the binder water glass into silicic acid precipitate. Not only the absorption and utilization of carbon dioxide are realized, and the carbon emission is reduced, but also when the modified water-permeable coarse aggregate is used to prepare a water-permeable brick, a water-permeable transition zone is formed between the coarse aggregate and the brick body through the coating layer, which together with the coarse aggregate body constructs a water-permeable channel, effectively overcoming the problem of insufficient mechanical strength of the traditional water-permeable brick and easy cracking due to the small contact area between the coarse aggregate and the matrix. In addition, the silicic acid precipitate in the coating layer is converted into nano-silicon dioxide in the subsequent drying process, which together with the nano-silicon dioxide formed by the pseudowollastonite performs a secondary hydration reaction to form a hydrated calcium silicate cementitious component, thereby improving the strength of the water-permeable transition zone, which also helps to improve the frost resistance of the water-permeable brick of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and serve as an explanation of the present application, and do not constitute an improper limitation of the present application.

[0028] Figure 1 The water-permeable coarse aggregate sample prepared for the following Example 1 is shown in the figure.

[0029] Figure 2 The compressive strength test figure of the water-permeable brick prepared for the following Example 1 is shown in the figure. DETAILED DESCRIPTION

[0030] The present application will be further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present application and do not limit the scope of the present application. The experimental methods not specified in the following examples are usually carried out according to the conventional conditions or according to the conditions recommended by the manufacturers.

[0031] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by one of ordinary skill in the art. The reagents or materials used in the present application can be purchased through conventional routes, and unless otherwise specified, the reagents or materials used in the present application are used according to the conventional manner in the art or according to the product instructions. In addition, any method and material similar or equivalent to those described can be applied to the present application. The technical solutions of the present application are further described in conjunction with the drawings and specific examples of the present application.

[0032] Example 1

[0033] A preparation method of a cement-based water-permeable brick of Yellow River sediment sand aggregate, comprising the following steps:

[0034] (1) Mix molasses and water in a mass ratio of 2.5:1, and stir uniformly to obtain a diluted molasses solution, which is ready for use.

[0035] (2) Mix the Yellow River sediment sand (containing 8.11wt.% of mud content) with a fineness modulus of 0.72, municipal sludge powder, basalt fiber with a length of 3mm, and the diluted molasses solution in a ratio of 275 parts by weight:600 parts by weight:42 parts by weight:140 parts by weight, and stir uniformly, then granulate the mixture, and then dry the granules at 70℃ for 50min, then heat to 380℃ at a temperature of 10℃ for preheating for 15min, then continue to heat to 1300℃ for 20min for sintering treatment, then cool to room temperature, and screen out the granules with a particle size distribution of 15-20mm, to obtain a water-permeable coarse aggregate, which is ready for use.

[0036] (3) Mix the pseudo-wollastonite powder with a fineness of 400 mesh, the waste red brick micro-powder with a fineness of 150 mesh, and the water glass with a mass fraction of 20% in a ratio of 1.0g:3.8g:8g, and stir uniformly to form a slurry, then add the water-permeable coarse aggregate to the slurry for surface coating, then separate the coarse aggregate, and place it in a carbonization box (with a relative humidity of 95-99% and a carbon dioxide volume ratio of 15%), and heat to 60℃ for 2.5 hours. Then heat the obtained aggregate to 180℃ at a heating rate of 3℃ / min for 1.5 hours to dry, to obtain a modified water-permeable coarse aggregate (as shown in Figure 1

[0037] ​(4) Take the following raw materials: 730 parts by weight of PO 42.5 cement, 1150 parts by weight of waste red brick coarse aggregate with a particle size distribution between 5 and 15 mm, 2260 parts by weight of the modified permeable coarse aggregate, 95 parts by weight of 400-mesh glass powder, 73 parts by weight of 20 mm long polyethylene fiber, and 13 parts by weight of polycarboxylic acid water reducer. Mix the above raw materials evenly and add clean water according to a water-cement ratio of 0.42. After stirring evenly, pour the resulting slurry into a mold, demould after hardening and forming, and then naturally cure at room temperature for 28 days to produce cement-based permeable bricks.

[0038] The compressive strength of the Yellow River sediment sand aggregate cement-based permeable brick prepared in this embodiment was tested according to the "Concrete Physical and Mechanical Properties Test Method Standard" (GBT 50081-2019). Figure 2 (As shown). Frost resistance tests were conducted on the Yellow River sediment aggregate cement-based permeable bricks according to the "Standard for Test Methods for Long-Term Performance and Durability of Concrete" (GBT 50082-2024), and the compressive strength loss rate was calculated. The permeability of the cement-based permeable bricks was tested according to the "Technical Specification for Permeable Cement Concrete Pavement" (CJJ / T135-2009). The test results showed: compressive strength = 30.56 MPa, compressive strength loss rate = 5.17%, and permeability coefficient = 2.32 mm / s.

[0039] Example 2

[0040] A method for preparing Yellow River sediment sand aggregate cement-based permeable bricks comprises the following steps:

[0041] (1) Mix molasses and water in a mass ratio of 3:1 and stir evenly to obtain diluted molasses solution for later use.

[0042] (2) Yellow River sediment sand with a fineness modulus of 0.72 (mud content of 8.11 wt.%), municipal sludge powder, 2 mm long cut basalt fiber, and diluted molasses liquid are mixed in a ratio of 240 parts by weight: 510 parts by weight: 25 parts by weight: 120 parts by weight and stirred evenly. The obtained mixture is then granulated. The obtained granules are then dried at 60°C for 30 minutes. After completion, they are first heated to 420°C at a temperature of 10°C for preheating for 10 minutes, and then continued to be heated to 1400°C and kept warm for 25 minutes for sintering. After completion, they are cooled to room temperature and sieved to obtain granules with a particle size distribution between 10 and 15 mm to obtain permeable coarse aggregate for standby use.

[0043] (3) Mix the wollastonite powder with fineness of 300 mesh, the waste red brick micro-powder with fineness of 120 mesh, and the water glass with mass fraction of 15% in a ratio of 1.2 g:3.4 g:7.5 g, stir uniformly to form a slurry, then add the water-permeable coarse aggregate into the slurry for surface coating, then separate the coarse aggregate, and place it in a carbonization box (the relative humidity is kept between 95-99%, and the volume ratio of carbon dioxide is set to 18%), heat to 70°C for 2 hours. After completion, the obtained aggregate is heated to 200°C at a heating rate of 5°C / min for 1 hour to dry, to obtain modified water-permeable coarse aggregate, for standby.

[0044] (4) Take the following raw materials: P.O 42.5 cement 780 parts by weight, waste red brick coarse aggregate with particle size distribution between 5-15 mm 1220 parts by weight, the modified water-permeable coarse aggregate 2400 parts by weight, glass powder with fineness of 500 mesh 100 parts by weight, polypropylene fiber with length of 5 mm 80 parts by weight, and polycarboxylic acid water reducer 17 parts by weight. Mix the above raw materials uniformly, then add water according to a water-cement ratio of 0.38, stir uniformly, then pour the obtained slurry into a mold, harden and shape, then demold, and then naturally cure at room temperature for 28 days, to obtain a cement-based water-permeable brick.

[0045] The compressive strength, compressive strength loss rate after freeze resistance test, and water permeability of the Yellow River sediment sand aggregate cement-based water-permeable brick prepared in this embodiment are tested by the same method as in the above embodiment 1. The results are: compressive strength = 31.27 MPa, compressive strength loss rate = 4.81%, and water permeability coefficient = 2.19 mm / s.

[0046] Example 3

[0047] A preparation method of a Yellow River sediment sand aggregate cement-based water-permeable brick, comprising the following steps:

[0048] (1) Mix molasses and water in a mass ratio of 2.2:1 to obtain a diluted molasses solution, for standby.

[0049] (2) Mix the Yellow River sediment sand with fineness modulus of 0.72 (containing 8.11 wt.% of mud content), municipal sludge powder, and chopped basalt fiber with length of 1 mm, and the diluted molasses solution in a ratio of 300 parts by weight:625 parts by weight:48 parts by weight:150 parts by weight, stir uniformly, then granulate the obtained mixture, and then dry the obtained granular material at 50°C for 60 min. After completion, first heat to 350°C at a temperature of 10°C for 20 min, then continue to heat to 1200°C for 30 min for sintering treatment, cool to room temperature after completion, and sieve out the granular material with particle size distribution between 15-20 mm, to obtain a water-permeable coarse aggregate, for standby.

[0050] (3) Mix wollastonite powder with fineness of 500 mesh, waste red brick micro powder with fineness of 100 mesh, and water glass with mass fraction of 25% in a ratio of 1.3g:4.1g:9.5g, and stir uniformly to form a slurry, then add the water-permeable coarse aggregate into the slurry for surface coating, then separate the coarse aggregate, and place it in a carbonization box (relative humidity is kept between 95% and 99%, and the volume ratio of carbon dioxide is set to 20%), heat to 65℃ and keep for 2 hours. After completion, heat the obtained aggregate to 220℃ at a heating rate of 5℃ / min and dry for 1 hour to obtain modified water-permeable coarse aggregate, which is ready for use.

[0051] (4) Take the following raw materials: P.O 42.5 cement 700 parts by weight, waste red brick coarse aggregate with particle size distribution between 5-15mm 1060 parts by weight, the modified water-permeable coarse aggregate 2160 parts by weight, glass powder with fineness of 500 mesh 90 parts by weight, basalt fiber with length of 30mm 55 parts by weight, and lignin sulfonate sodium water reducer 11 parts by weight. Mix the above raw materials uniformly, then add water according to a water-cement ratio of 0.45, stir uniformly, then pour the obtained slurry into a mold, demold after hardening and shaping, and then naturally cure at room temperature for 28 days to obtain a cement-based water-permeable brick.

[0052] The compressive strength, compressive strength loss rate after freeze resistance test, and water permeability of the Yellow River sediment sand aggregate cement-based water-permeable brick prepared in this embodiment are tested by the same method as in the above embodiment 1. The test results are: compressive strength = 32.13MPa, compressive strength loss rate = 4.34%, and water permeability coefficient = 2.67mm / s.

[0053] Example 4

[0054] A preparation method of a Yellow River sediment sand aggregate cement-based water-permeable brick, comprising the following steps:

[0055] Take the following raw materials: P.O 42.5 cement 730 parts by weight, waste red brick coarse aggregate with particle size distribution between 5-15mm 1150 parts by weight, crushed stone coarse aggregate with particle size distribution between 15-20mm 2260 parts by weight, glass powder with fineness of 400 mesh 95 parts by weight, polyethylene fiber with length of 20mm 73 parts by weight, and polycarboxylic acid water reducer 13 parts by weight. Mix the above raw materials uniformly, then add water according to a water-cement ratio of 0.42, stir uniformly, then pour the obtained slurry into a mold, demold after hardening and shaping, and then naturally cure at room temperature for 28 days to obtain a cement-based water-permeable brick.

[0056] The compressive strength, the compressive strength loss rate after the anti-frost test and the water permeability of the Yellow River sediment sand aggregate cement-based water permeable brick prepared in this embodiment are tested by the same method as that of the above-mentioned embodiment 1. The test results are: compressive strength = 22.89 MPa, compressive strength loss rate = 26.67%, water permeability coefficient = 2.81 mm / s.

[0057] Example 5

[0058] A preparation method of a Yellow River sediment sand aggregate cement-based water permeable brick, comprising the following steps:

[0059] (1) Mix molasses and water in a mass ratio of 2.5:1, and stir uniformly to obtain a diluted molasses solution, which is used as needed.

[0060] (2) Mix the Yellow River sediment sand with a fineness modulus of 0.72 (containing 8.11 wt.% of mud), municipal sludge powder, basalt fiber with a length of 3 mm, and the diluted molasses solution in a proportion of 275 parts by weight:600 parts by weight:42 parts by weight:140 parts by weight, and stir uniformly, then granulate the mixture obtained, and then dry the granular material obtained at 70°C for 50 min, then heat to 380°C at a temperature of 10°C for 15 min, then continue to heat to 1300°C for 20 min for sintering treatment, and then cool to room temperature, and screen out the granular material with a particle size distribution of 15-20 mm, to obtain a water permeable coarse aggregate, which is used as needed.

[0061] (3) Take the following raw materials: P.O 42.5 cement 730 parts by weight, waste red brick coarse aggregate with a particle size distribution of 5-15 mm 1150 parts by weight, the water permeable coarse aggregate 2260 parts by weight, glass powder with a fineness of 400 mesh 95 parts by weight, polyethylene fiber with a length of 20 mm 73 parts by weight, and polycarboxylic acid water reducer 13 parts by weight. Mix the above-mentioned raw materials uniformly, then add water according to a water-cement ratio of 0.42, stir uniformly, then pour the slurry obtained into a mold, harden and shape, then demold, and then naturally cure at room temperature for 28 days to obtain a cement-based water permeable brick.

[0062] The compressive strength, the compressive strength loss rate after the anti-frost test and the water permeability of the Yellow River sediment sand aggregate cement-based water permeable brick prepared in this embodiment are tested by the same method as that of the above-mentioned embodiment 1. The test results are: compressive strength = 22.89 MPa, compressive strength loss rate = 26.67%, water permeability coefficient = 2.81 mm / s.

[0063] Example 6

[0064] A preparation method of a Yellow River sediment sand aggregate cement-based water permeable brick, comprising the following steps:

[0065] (1) Mix molasses and water in a mass ratio of 3:1, stir evenly to obtain diluted molasses solution, and reserve.

[0066] (2) Mix Yellow River sedimentary sand (containing 8.11wt.% of mud) with a fineness modulus of 0.72, municipal sludge powder, basalt fiber with a length of 2 mm, and diluted molasses solution in a weight ratio of 240:510:25:120, stir evenly, then granulate the mixture, dry the granules at 60°C for 30 min, preheat to 420°C at a temperature increase of 10°C for 10 min, then continue to heat to 1400°C for 25 min for sintering treatment, cool to room temperature after completion, and sieve out the granules with a particle size distribution of 10-15 mm to obtain water-permeable coarse aggregate, which is reserved.

[0067] (3) Mix pseudowollastonite powder with a fineness of 300 mesh, discarded red brick micro-powder with a fineness of 120 mesh, and water glass with a mass fraction of 15% in a ratio of 1.2g:3.4g:7.5g, stir evenly to form a slurry, then add the water-permeable coarse aggregate to the slurry for surface coating, separate the coarse aggregate, and dry it at a heating rate of 5°C / min to 200°C for 1 hour to obtain modified water-permeable coarse aggregate, which is reserved.

[0068] (4) Take the following raw materials: P.O 42.5 cement 780 parts by weight, discarded red brick coarse aggregate with a particle size distribution of 5-15 mm 1220 parts by weight, modified water-permeable coarse aggregate 2400 parts by weight, glass powder with a fineness of 500 mesh 100 parts by weight, polypropylene fiber with a length of 5 mm 80 parts by weight, and polycarboxylic acid water reducer 17 parts by weight. Mix the above raw materials evenly, then add water according to a water-cement ratio of 0.38, stir evenly, pour the obtained slurry into a mold, demold after hardening and shaping, and then naturally cure at room temperature for 28 days to obtain a cement-based water-permeable brick.

[0069] The compressive strength, compressive strength loss rate after freeze resistance test, and water permeability of the Yellow River sedimentary sand aggregate cement-based water-permeable brick prepared in this embodiment were tested by the same method as in the above embodiment 1. The test results are: compressive strength = 27.16 MPa, compressive strength loss rate = 11.83%, and water permeability coefficient = 2.31 mm / s.

[0070] Example 7

[0071] A preparation method of a Yellow River sedimentary sand aggregate cement-based water-permeable brick, comprising the following steps:

[0072] (1) Mix molasses and water in a mass ratio of 2.2:1, stir evenly to obtain diluted molasses solution, and reserve.

[0073] (2) Yellow River sediment sand (mud content 8.11 wt.%) with a fineness modulus of 0.72, municipal sludge powder, and diluted molasses liquid are mixed in a ratio of 300 parts by weight: 625 parts by weight: 150 parts by weight and stirred evenly. The mixture is then granulated and the granules are dried at 50°C for 60 min. After the mixture is granulated, it is preheated to 350°C at a temperature of 10°C for 20 min, and then continued to be heated to 1200°C and kept warm for 30 min for sintering. After the mixture is granulated, it is cooled to room temperature and the granules with a particle size distribution between 8 and 10 mm are sieved to obtain permeable coarse aggregate for later use.

[0074] (3) Pseudo-wollastonite powder with a fineness of 500 mesh, waste red brick powder with a fineness of 100 mesh, and water glass with a mass fraction of 25% are mixed in a ratio of 1.3 g: 4.1 g: 9.5 g and stirred evenly to form a slurry. The permeable coarse aggregate is then added to the slurry for surface coating. The coarse aggregate is then separated and placed in a carbonization box (relative humidity maintained between 95% and 99%, with the volume fraction of carbon dioxide set to 20%), heated to 65°C and kept warm for 2 hours. After completion, the obtained aggregate is heated to 220°C at a heating rate of 5°C / min and dried for 1 hour to obtain the modified permeable coarse aggregate for later use.

[0075] (4) Take the following raw materials: 700 parts by weight of PO 42.5 cement, 1060 parts by weight of waste red brick coarse aggregate with a particle size distribution between 5 and 15 mm, 2160 parts by weight of the modified permeable coarse aggregate, 90 parts by weight of 500-mesh glass powder, 55 parts by weight of 30 mm long basalt fiber, and 11 parts by weight of sodium lignin sulfonate water reducer. Mix the above raw materials evenly and add clean water according to a water-cement ratio of 0.45. After stirring evenly, pour the resulting slurry into a mold, demould after hardening and forming, and then naturally cure at room temperature for 28 days to produce cement-based permeable bricks.

[0076] The compressive strength, compressive strength loss rate after frost resistance testing, and water permeability of the Yellow River sediment aggregate cement-based permeable bricks prepared in this example were tested using the same methods as in Example 1. The results were: compressive strength = 25.33 MPa, compressive strength loss rate = 15.07%, and water permeability coefficient = 2.48 mm / s.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for preparing Yellow River sediment sand aggregate cement-based permeable bricks, characterized in that: The steps include: (1) Yellow River sediment sand, municipal sludge, chopped basalt fiber, and diluted molasses are mixed and granulated, and the obtained granules are dried, preheated, and then heated to 1200-1400°C for sintering. After cooling, permeable coarse aggregate is obtained and set aside; (2) Pseudo-wollastonite powder and red brick powder are added to water glass and stirred to form a slurry, and then the permeable coarse aggregate is added to the slurry for surface coating, and then the coarse aggregate is separated and carbonized under heating conditions. After completion, the obtained aggregate is dried to obtain the modified permeable coarse aggregate for standby use; (3) Take the following raw materials: 700-780 parts by weight of cement component, 1060-1220 parts by weight of waste red brick coarse aggregate, 2160-2400 parts by weight of modified permeable coarse aggregate, 90-100 parts by weight of glass powder, 55-80 parts by weight of fiber, and 11-17 parts by weight of water reducer; mix the above raw materials with water evenly, and then cast the obtained slurry into shape and then cure it to obtain the Yellow River sediment sand aggregate cement-based permeable brick.

2. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (1), the ratio of the Yellow River sediment sand, municipal sludge, chopped basalt fiber and diluted molasses liquid is 240-300 parts by weight: 510-625 parts by weight: 25-48 parts by weight: 120-150 parts by weight.

3. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (1), the length of the chopped basalt fibers is 1 to 3 mm.

4. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (1), the diluted molasses solution is prepared by mixing water and molasses in a mass ratio of 1:2.2-3.

5. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (1), the drying temperature is 50-70°C and the drying time is 30-60 minutes.

6. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (1), the preheating temperature is 350-420°C and the time is 10-20 minutes.

7. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (1), the sintering treatment time is 20 to 30 minutes.

8. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (1), the particle size of the permeable coarse aggregate is 10-20 mm.

9. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (2), the ratio of the pseudo wollastonite powder, red brick powder and water glass is 1-1.3 g: 3.4-4.1 g: 7.5-9.5 g, and the mass fraction of the water glass is 15-25%.

10. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (2), the fineness of the pseudo-wollastonite powder is 300-500 mesh.

11. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (2), the fineness of the red brick powder is 100-150 mesh.

12. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (2), the carbonization treatment is carried out in a carbonization box, wherein the relative humidity is maintained between 95% and 99%, and the volume proportion of carbon dioxide is 15% to 20%.

13. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (2), the heating temperature is 60-70° C., and the carbonization treatment time is 2-2.5 hours.

14. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (2), the drying temperature is 180-220° C. and the drying time is 1-1.5 hours.

15. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: In step (3), water is added according to a water-cement ratio of 0.38 to 0.

45.

16. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to any one of claims 1 to 15, characterized in that: In step (3), the fineness of the glass powder is 400-500 mesh.

17. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to any one of claims 1 to 15, characterized in that: In step (3), the particle size of the waste red brick coarse aggregate is 5-15 mm.

18. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to any one of claims 1 to 15, characterized in that: In step (3), the fibers include one or more of basalt fibers, polyethylene fibers, polypropylene fibers, and polyacrylonitrile fibers.

19. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to any one of claims 1 to 15, characterized in that: In step (3), the length of the fiber is 5 to 30 mm.

20. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to any one of claims 1 to 15, characterized in that: In step (3), the water reducer includes one or more of a polycarboxylic acid water reducer, a naphthalene water reducer, and a lignin sulfonate water reducer.

21. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to any one of claims 1 to 15, characterized in that: In step (3), the curing method is natural curing at room temperature for 21 to 28 days.

Images