Preparation method of Yellow River deposited sand aggregate cement-based water permeable brick

Abstract

The invention discloses a preparation method of a Yellow River deposited sand aggregate cement-based water permeable brick, which comprises the following steps: (1) uniformly mixing Yellow River deposited sand, municipal sludge, chopped basalt fiber and diluted molasses liquid, granulating, drying, and sintering to obtain a water permeable coarse aggregate; and (2) adding pseudo-wollastonite powder and red brick micro powder into water glass, uniformly stirring to form slurry, then adding the water-permeable coarse aggregate into the slurry for surface coating, then separating out the coarse aggregate, performing carbonization treatment under a heating condition, and drying the obtained aggregate after the carbonization treatment is completed, thereby obtaining the modified water-permeable coarse aggregate. And (3) uniformly mixing the cement component, the waste red brick coarse aggregate, the modified permeable coarse aggregate, the glass powder, the fiber, the water reducing agent and water, casting and molding the obtained slurry, and curing. The method effectively overcomes the adverse effect on the performance of the water permeable brick caused by high silt content of the yellow river sedimentary sand, and facilitates the resource utilization of the yellow river sedimentary sand.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of cement-based permeable bricks, and particularly relates to a method for preparing a cement-based permeable brick with Yellow River sediment sand as aggregate. Background Art

[0002] Disclosing the information of this background art section is only intended to enhance the overall understanding of the present invention, and it is not necessarily regarded as an admission or an indication in any form that this information constitutes the prior art already known to those of ordinary skill in the art.

[0003] As is well known, the Yellow River in our country is a sediment-laden river. The annual sediment transport volume in the middle reaches is as high as 1.6 billion tons. Every year, about 400 million tons of Yellow River sediment accumulates in the lower reaches of the riverbed, forming an artificial desert after years of accumulation. For a long time, sand control has been the key to promoting ecological protection in the Yellow River Basin, and reducing the Yellow River sediment in the lower reaches is of top priority.

[0004] Yellow River sediment is mainly composed of aluminosilicates and is a rich natural resource. As the main component of concrete building materials, sand has a huge demand in local economic development. If the Yellow River sediment is used in the preparation of concrete materials, it is conducive to promoting the large-scale utilization of this natural resource and solving the problem of sediment accumulation in the Yellow River. However, the mud content in the Yellow River sediment is usually between 6% and 20%, which is much higher than that in ordinary river sand. This will lead to the deterioration of the mechanical properties of the prepared concrete materials. In addition, the Yellow River sediment has been scoured by water for a long time, and its surface is smoother, which is not conducive to forming mechanical interlocking in the prepared concrete materials, resulting in a decrease in mechanical properties. For cement-based permeable bricks, due to their relatively large number of pores and lower strength than ordinary concrete structures, coupled with the influence of the high mud content in the Yellow River sediment, it will lead to insufficient strength of the permeable bricks, a decrease in service life, and an increase in the later maintenance frequency and cost. Summary of the Invention

[0005] In view of the above problems, the present invention provides a method for preparing a cement-based permeable brick with Yellow River sediment sand as aggregate, which converts the Yellow River sediment into permeable coarse aggregate and effectively overcomes the adverse effects on the mechanical properties of the permeable brick. Specifically, the technical solution of the present invention is as follows.

[0006] A method for preparing a cement-based permeable brick with Yellow River sediment sand as aggregate, comprising the following steps: (1) Mix the Yellow River sediment, municipal sludge, chopped basalt fiber, and diluted molasses solution evenly and granulate them. Then dry the obtained particulate matter, preheat it after completion, and then carry out sintering treatment. After cooling, obtain permeable coarse aggregate for standby.

[0007] (2) Add wollastonite powder and red brick fine powder to water glass and stir evenly to form a slurry. Then add the permeable coarse aggregate to the slurry for surface coating, and then separate the coarse aggregate and perform carbonization treatment under heating conditions. After completion, dry the obtained aggregate to obtain the modified permeable coarse aggregate for standby.

[0008] (3) Take the following raw materials: cement component, waste red brick coarse aggregate, modified permeable coarse aggregate, glass powder, fiber, water reducing agent. Mix the above raw materials with water evenly, and then pour the obtained slurry into a mold and cure it to obtain the Yellow River sediment sand aggregate cement-based permeable brick.

[0009] 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.

[0010] Further, in step (1), the diluted molasses liquid is composed of water and molasses mixed in a mass ratio of 1:2.2 - 3.

[0011] Further, in step (1), the drying temperature is 50 - 70 °C and the time is 30 - 60 min.

[0012] Further, in step (1), the preheating temperature is 350 - 420 °C and the time is 10 - 20 min.

[0013] Further, in step (1), the sintering treatment temperature is 1200 - 1400 °C and the time is 20 - 30 min.

[0014] Further, in step (1), the particle size of the permeable coarse aggregate is 10 - 20 mm.

[0015] Further, in step (2), the ratio of the wollastonite powder, red brick fine 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%. Optionally, the fineness of the wollastonite powder is 300 - 500 mesh. The fineness of the red brick fine powder is 100 - 150 mesh.

[0016] Further, in step (2), the carbonization treatment is carried out in a carbonization chamber, where the relative humidity is maintained between 95 - 99% and the volume ratio of carbon dioxide is 15 - 20%.

[0017] Further, in step (2), the heating temperature is 60 - 70 °C and the time of the carbonization treatment is 2 - 2.5 hours.

[0018] Further, in step (2), the drying temperature is 180 - 220 °C, and the time is 1 - 1.5 hours.

[0019] Further, in step (3), the proportion of each component in the raw materials is as follows: 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 reducing agent.

[0020] Further, in step (3), the water is added according to a water - cement ratio of 0.38 - 0.45.

[0021] Further, 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.

[0022] Further, in step (3), the fiber includes one or more of basalt fiber, polyethylene fiber, polypropylene fiber, polyacrylonitrile fiber, etc. Optionally, the length of the fiber is 5 - 30 mm.

[0023] Further, in step (3), the water reducing agent includes one or more of polycarboxylate water reducing agent, naphthalene - based water reducing agent, lignosulfonate water reducing agent, etc.

[0024] Further, in step (3), the curing method is natural curing at room temperature for 21 - 28 days.

[0025] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects: The present invention burns the particles made of Yellow River sediment sand, municipal sludge, chopped basalt fiber, and molasses. In this process, the organic matter contained in the municipal sludge and molasses are removed under the action of high temperature to form a porous structure. After the Yellow River sediment sand and chopped basalt fiber are solidified therein, a good permeable coarse aggregate with mechanical properties is formed, effectively overcoming the adverse effect of the high mud content of the Yellow River sediment sand on the mechanical properties of the permeable brick. At the same time, the resource utilization of industrial wastes such as municipal sludge and molasses is also realized. Further, after coating a coating layer formed by wollastonite powder, red brick fine powder, and sodium silicate on the surface of the permeable coarse aggregate, carbonization treatment is carried out. Carbon dioxide is used to promote the reaction of the wollastonite to form nano-silica, and at the same time, the binder sodium silicate is converted into silica precipitate. Not only is the absorption and utilization of carbon dioxide realized, and carbon emissions are reduced, but when the modified permeable coarse aggregate is used to prepare a permeable brick, a permeable transition zone is formed between the coarse aggregate and the brick body through the coating layer, and it and the coarse aggregate body jointly construct a permeable channel, effectively overcoming the problem that the mechanical strength of the traditional permeable brick is insufficient due to the small contact area between the coarse aggregate and the matrix, and it is easy to crack. In addition, the silica precipitate in the coating layer is converted into nano-silica during the subsequent drying process, and the nano-silica formed by it and the wollastonite jointly carry out a secondary hydration reaction with the calcium hydroxide generated by the hydration reaction of the cement component to form a hydrated calcium silicate gel component, improving the strength of the permeable transition zone, which also helps to improve the frost resistance of the permeable brick of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0027] Figure 1 Diagram of the permeable coarse aggregate sample prepared for Example 1 below.

[0028] Figure 2 Diagram of the compressive strength test of the permeable brick prepared for Example 1 below. DETAILED DESCRIPTION OF THE INVENTION

[0029] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. The experimental methods without specific conditions noted in the following embodiments are generally carried out under conventional conditions or according to the conditions recommended by the manufacturer.

[0030] Unless otherwise defined, all professional and scientific terms used in the present invention have the same meanings as those familiar to persons skilled in the art. The reagents or raw materials used in the present invention can all be obtained by conventional means. Unless otherwise specified, the reagents or raw materials used in the present invention are used in accordance with the conventional methods in the art or in accordance with the product instructions. In addition, any methods and materials similar or equivalent to the described content can be applied to the method of the present invention. The technical solution of the present invention will be further described below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0031] Example 1 A preparation method of a cement-based permeable brick with Yellow River sediment sand aggregate comprises the following steps: (1) Mix molasses and clear water according to a mass ratio of 2.5:1, and stir evenly to obtain a diluted molasses solution for standby.

[0032] (2) Mix Yellow River sediment sand with a fineness modulus of 0.72 (mud content 8.11 wt.%), municipal sludge powder, cut basalt fibers with a length of 3 mm, and the diluted molasses solution according to a ratio of 275 parts by weight: 600 parts by weight: 42 parts by weight: 140 parts by weight, and stir evenly. Then granulate the obtained mixture, and then dry the obtained particulate matter at 70 °C for 50 min. After completion, first heat it to 380 °C at a temperature of 10 °C for preheating for 15 min, and then continue to heat it to 1300 °C for heat preservation for 20 min for sintering treatment. After completion, cool it to room temperature, and screen out the particulate matter with a particle size distribution between 15 and 20 mm to obtain permeable coarse aggregate for standby.

[0033] (3) Mix wollastonite powder with a fineness of 400 meshes, waste red brick fine powder with a fineness of 150 meshes, and sodium silicate with a mass fraction of 20% according to a ratio of 1.0 g: 3.8 g: 8 g, and stir evenly to form a slurry. Then add the permeable coarse aggregate to the slurry for surface coating, and then separate the coarse aggregate, and place it in a carbonization box (relative humidity is maintained between 95 and 99%, and the volume fraction of carbon dioxide is set to 15%), and heat it to 60 °C for heat preservation for 2.5 hours. After completion, heat the obtained aggregate to 180 °C at a heating rate of 3 °C / min for drying for 1.5 hours to obtain modified permeable coarse aggregate (as Figure 1 shown) for standby.

[0034] (4) Take the following raw materials: 730 parts by weight of P.O 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 glass powder with a fineness of 400 mesh, 73 parts by weight of polyethylene fiber with a length of 20 mm, and 13 parts by weight of polycarboxylate water reducer. After mixing the above raw materials evenly, add clear water according to a water-cement ratio of 0.42, stir evenly, pour the obtained slurry into a mold, demold after hardening and forming, and then cure naturally at room temperature for 28 days to obtain a cement-based permeable brick.

[0035] According to the "Standard Test Method for Physical and Mechanical Properties of Concrete" (GBT 50081-2019), test the compressive strength of the Yellow River sediment sand aggregate cement-based permeable brick prepared in this example (as Figure 2 shown). According to the "Standard Test Method for Long-Term Performance and Durability of Concrete" (GBT 50082-2024), conduct a frost resistance test on the Yellow River sediment sand aggregate cement-based permeable brick and calculate the compressive strength loss rate. According to the "Technical Specification for Permeable Cement Concrete Pavement" (CJJ / T135-2009), test the water permeability of the cement-based permeable brick. The test results are as follows: compressive strength = 30.56 MPa, compressive strength loss rate = 5.17%, and water permeability coefficient = 2.32 mm / s.

[0036] Example 2 A preparation method of a Yellow River sediment sand aggregate cement-based permeable brick, comprising the following steps: (1) Mix molasses and clear water according to a mass ratio of 3:1 and stir evenly to obtain a diluted molasses solution for standby.

[0037] (2) Mix Yellow River sediment with a fineness modulus of 0.72 (mud content 8.11 wt.%), municipal sludge powder, cut basalt fiber with a length of 2 mm, and the diluted molasses solution in a ratio of 240 parts by weight: 510 parts by weight: 25 parts by weight: 120 parts by weight, stir evenly, then granulate the obtained mixture, and then dry the obtained particles at 60 °C for 30 min. After completion, first heat to 420 °C at a temperature of 10 °C for 10 min, and then continue to heat to 1400 °C and hold for 25 min for sintering treatment. After completion, cool to room temperature and screen out particles with a particle size distribution between 10 and 15 mm to obtain permeable coarse aggregate for standby.

[0038] (3) Mix wollastonite powder with a fineness of 300 mesh, waste red brick fines with a fineness of 120 mesh, and water glass with a mass fraction of 15% in a ratio of 1.2 g: 3.4 g: 7.5 g, stir evenly to form a slurry, then add the permeable coarse aggregate to the slurry for surface coating, then separate the coarse aggregate, place it in a carbonization chamber (relative humidity maintained between 95% and 99%, carbon dioxide volume ratio set at 18%), heat to 70 °C and keep warm for 2 hours. After completion, heat the obtained aggregate to 200 °C at a heating rate of 5 °C / min and dry for 1 hour to obtain modified permeable coarse aggregate for standby.

[0039] (4) Take the following raw materials: 780 parts by weight of P.O 42.5 cement, 1220 parts by weight of waste red brick coarse aggregate with a particle size distribution between 5 and 15 mm, 2400 parts by weight of the modified permeable coarse aggregate, 100 parts by weight of glass powder with a fineness of 500 mesh, 80 parts by weight of polypropylene fiber with a length of 5 mm, and 17 parts by weight of polycarboxylate water reducer. Mix the above raw materials evenly, add clear water according to a water-cement ratio of 0.38, stir evenly, then pour the obtained slurry into a mold, demold after hardening and forming, and then cure naturally at room temperature for 28 days to obtain cement-based permeable bricks.

[0040] Use the same method as in Example 1 above to test the compressive strength of the cement-based permeable bricks prepared in this example with Yellow River sediment sand aggregate, the loss rate of compressive strength after freeze-thaw test, and the water permeability performance. The measured results are: compressive strength = 31.27 MPa, compressive strength loss rate = 4.81%, water permeability coefficient = 2.19 mm / s.

[0041] Example 3 A preparation method of cement-based permeable bricks with Yellow River sediment sand aggregate, comprising the following steps: (1) Mix molasses and clear water in a mass ratio of 2.2:1, stir evenly to obtain a diluted molasses solution for standby.

[0042] (2) Mix Yellow River sediment with a fineness modulus of 0.72 (mud content 8.11 wt.%), municipal sludge powder, cut basalt fiber with a 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 evenly, then granulate the obtained mixture, and then dry the obtained particles at 50 °C for 60 min. After completion, first heat to 350 °C at a temperature of 10 °C for 20 min for preheating, and then continue to heat to 1200 °C and keep warm for 30 min for sintering treatment. After completion, cool to room temperature and screen out particles with a particle size distribution between 15 and 20 mm, which is the permeable coarse aggregate for standby.

[0043] (3) Mix wollastonite powder with a fineness of 500 mesh, waste red brick fine powder with a fineness of 100 mesh, and sodium silicate with a mass fraction of 25% evenly at a ratio of 1.3 g: 4.1 g: 9.5 g to form a slurry. Then add the permeable coarse aggregate to the slurry for surface coating, and then separate the coarse aggregate. Place it in a carbonization chamber (relative humidity maintained between 95% and 99%, carbon dioxide volume ratio set at 20%), heat it to 65 °C and keep it warm for 2 hours. After completion, heat the obtained aggregate to 220 °C at a heating rate of 5 °C / min and dry it for 1 hour to obtain modified permeable coarse aggregate for standby.

[0044] (4) Take the following raw materials: 700 parts by weight of P.O 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 glass powder with a fineness of 500 mesh, 55 parts by weight of basalt fiber with a length of 30 mm, and 11 parts by weight of sodium lignosulfonate water reducer. Mix the above raw materials evenly, add clear water according to a water-cement ratio of 0.45, stir evenly, pour the obtained slurry into a mold, demold after hardening and forming, and then cure naturally at room temperature for 28 days to obtain a cement-based permeable brick.

[0045] Use the same method as in Example 1 above to test the compressive strength of the Yellow River sediment sand aggregate cement-based permeable brick prepared in this example, the compressive strength loss rate after the freeze-thaw test, and the water permeability. The measured results are: compressive strength = 32.13 MPa, compressive strength loss rate = 4.34%, water permeability coefficient = 2.67 mm / s.

[0046] Example 4 A preparation method of a Yellow River sediment sand aggregate cement-based permeable brick, comprising the following steps: Take the following raw materials: 730 parts by weight of P.O 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 crushed stone coarse aggregate with a particle size distribution between 15 and 20 mm, 95 parts by weight of glass powder with a fineness of 400 mesh, 73 parts by weight of polyethylene fiber with a length of 20 mm, and 13 parts by weight of polycarboxylic acid water reducer. Mix the above raw materials evenly, add clear water according to a water-cement ratio of 0.42, stir evenly, pour the obtained slurry into a mold, demold after hardening and forming, and then cure naturally at room temperature for 28 days to obtain a cement-based permeable brick.

[0047] The compressive strength, the loss rate of compressive strength after freeze-thaw test, and the water permeability of the prepared Yellow River sediment sand aggregate cement-based permeable brick of this example were tested using the same method as in Example 1 above. The measured results were: compressive strength = 22.89 MPa, loss rate of compressive strength = 26.67%, and water permeability coefficient = 2.81 mm / s.

[0048] Example 5 A preparation method of a Yellow River sediment sand aggregate cement-based permeable brick includes the following steps: (1) Mix molasses and clear water according to a mass ratio of 2.5:1, and stir evenly to obtain a diluted molasses solution for standby.

[0049] (2) Mix Yellow River sediment sand with a fineness modulus of 0.72 (mud content 8.11 wt.%), municipal sludge powder, cut basalt fibers with a length of 3 mm, and the diluted molasses solution according to a ratio of 275 parts by weight: 600 parts by weight: 42 parts by weight: 140 parts by weight, and stir evenly. Then granulate the obtained mixture, and then dry the obtained particles at 70 °C for 50 min. After completion, first heat to 380 °C at a temperature of 10 °C for preheating for 15 min, and then continue to heat to 1300 °C for heat preservation for 20 min for sintering treatment. After completion, cool to room temperature, and screen out the particles with a particle size distribution between 15 and 20 mm, that is, obtain permeable coarse aggregate for standby.

[0050] (3) Take the following raw materials: 730 parts by weight of P.O 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 permeable coarse aggregate, 95 parts by weight of glass powder with a fineness of 400 mesh, 73 parts by weight of polyethylene fiber with a length of 20 mm, and 13 parts by weight of polycarboxylate water reducer. Mix the above raw materials evenly, add clear water according to a water-cement ratio of 0.42, stir evenly, then pour the obtained slurry into a mold, demold after hardening and forming, and then cure naturally at room temperature for 28 days to obtain a cement-based permeable brick.

[0051] The compressive strength, the loss rate of compressive strength after freeze-thaw test, and the water permeability of the prepared Yellow River sediment sand aggregate cement-based permeable brick of this example were tested using the same method as in Example 1 above. The measured results were: compressive strength = 35.71 MPa, loss rate of compressive strength = 8.22%, and water permeability coefficient = 1.65 mm / s.

[0052] Example 6 A preparation method of a Yellow River sediment sand aggregate cement-based permeable brick includes the following steps: (1) Mix molasses and clear water according to a mass ratio of 3:1, and stir evenly to obtain a diluted molasses solution for standby.

[0053] (2) Mix the Yellow River sediment sand with a fineness modulus of 0.72 (mud content 8.11 wt.%), municipal sludge powder, cut basalt fibers with a length of 2 mm, and diluted molasses solution in a ratio of 240 parts by weight: 510 parts by weight: 25 parts by weight: 120 parts by weight, and stir evenly. Then granulate the obtained mixture, and dry the obtained particulate matter at 60 °C for 30 min. After completion, first heat it to 420 °C at a temperature of 10 °C and preheat for 10 min, and then continue to heat to 1400 °C and hold for 25 min for sintering treatment. After completion, cool it to room temperature, and screen out the particulate matter with a particle size distribution between 10 and 15 mm to obtain permeable coarse aggregate for standby.

[0054] (3)Mix wollastonite powder with a fineness of 300 mesh, waste red brick fine powder with a fineness of 120 mesh, and water glass with a mass fraction of 15% in a ratio of 1.2 g: 3.4 g: 7.5 g, and stir evenly to form a slurry. Then add the permeable coarse aggregate to the slurry for surface coating, and then separate the coarse aggregate, and heat it to 200 °C at a heating rate of 5 °C / min and dry for 1 hour to obtain modified permeable coarse aggregate for standby.

[0055] (4)Take the following raw materials: 780 parts by weight of P.O 42.5 cement, 1220 parts by weight of waste red brick coarse aggregate with a particle size distribution between 5 and 15 mm, 2400 parts by weight of the modified permeable coarse aggregate, 100 parts by weight of glass powder with a fineness of 500 mesh, 80 parts by weight of polypropylene fibers with a length of 5 mm, and 17 parts by weight of polycarboxylate water reducer. After mixing the above raw materials evenly, add clean water according to a water-cement ratio of 0.38, stir evenly, pour the obtained slurry into a mold, demold after hardening and forming, and then cure naturally at room temperature for 28 days to obtain a cement-based permeable brick.

[0056] Use the same method as in Example 1 above to test the compressive strength, the loss rate of compressive strength after freeze-thaw test, and the water permeability of the Yellow River sediment sand aggregate cement-based permeable brick prepared in this example. The measured results are: compressive strength = 27.16 MPa, loss rate of compressive strength = 11.83%, and water permeability coefficient = 2.31 mm / s.

[0057] Example 7 A preparation method of a Yellow River sediment sand aggregate cement-based permeable brick, comprising the following steps: (1)Mix molasses and clean water in a mass ratio of 2.2:1, and stir evenly to obtain diluted molasses solution for standby.

[0058] (2) Mix the Yellow River sediment sand with a fineness modulus of 0.72 (mud content 8.11 wt.%), municipal sludge powder, and diluted molasses solution evenly at a ratio of 300 parts by weight: 625 parts by weight: 150 parts by weight, and then granulate the obtained mixture. Then dry the obtained particulate matter at 50 °C for 60 min. After completion, first heat it to 350 °C at a temperature of 10 °C for preheating for 20 min, and then continue to heat it to 1200 °C and hold for 30 min for sintering treatment. After completion, cool it to room temperature, and screen out the particulate matter with a particle size distribution between 8 and 10 mm to obtain permeable coarse aggregate for standby.

[0059] (3) Mix wollastonite powder with a fineness of 500 mesh, waste red brick fine powder with a fineness of 100 mesh, and sodium silicate with a mass fraction of 25% evenly at a ratio of 1.3 g: 4.1 g: 9.5 g to form a slurry. Then add the permeable coarse aggregate to the slurry for surface coating, and then separate the coarse aggregate. Place it in a carbonization box (relative humidity is maintained between 95 and 99%, and the volume ratio of carbon dioxide is set to 20%), and heat it to 65 °C and hold for 2 hours. After completion, heat the obtained aggregate to 220 °C at a heating rate of 5 °C / min and dry for 1 hour to obtain modified permeable coarse aggregate for standby.

[0060] (4) Take the following raw materials: 700 parts by weight of P.O 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 glass powder with a fineness of 500 mesh, 55 parts by weight of basalt fiber with a length of 30 mm, and 11 parts by weight of sodium lignosulfonate water reducer. After mixing the above raw materials evenly, add clear water according to a water-cement ratio of 0.45, stir evenly, and then pour the obtained slurry into a mold. After hardening and forming, demold it, and then cure it naturally at room temperature for 28 days to obtain a cement-based permeable brick.

[0061] Use the same method as in Example 1 above to test the compressive strength of the Yellow River sediment sand aggregate cement-based permeable brick prepared in this example, the compressive strength loss rate after the freeze-thaw test, and the water permeability. The measured results are: compressive strength = 25.33 MPa, compressive strength loss rate = 15.07%, and water permeability coefficient = 2.48 mm / s.

[0062] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for preparing a Yellow River sediment sand aggregate cement-based permeable brick, 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, sintered, cooled, and then permeable coarse aggregate is obtained for standby use; (2) adding pseudo wollastonite powder and red brick powder to water glass and stirring evenly to form a slurry, then adding the water-permeable coarse aggregate to the slurry for surface coating, then separating the coarse aggregate and carbonizing it under heating conditions, and drying the obtained aggregate after completion to obtain the modified water-permeable coarse aggregate for standby use; (3) Take the following raw materials: cement component, waste red brick coarse aggregate, modified permeable coarse aggregate, glass powder, fiber, and water reducing agent; mix the above raw materials with water evenly, and then cast the obtained slurry into shape and then perform curing 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; Optionally, in step (1), the length of the chopped basalt fibers is 1 to 3 mm.

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 diluted molasses solution is prepared by mixing water and molasses in a mass ratio of 1:2.2-3; Optionally, in step (1), the drying temperature is 50-70°C and the drying time is 30-60 min; Optionally, in step (1), the preheating temperature is 350-420° C. and the time is 10-20 min.

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 sintering temperature is 1200-1400° C. and the sintering time is 20-30 min. Optionally, in step (1), the particle size of the permeable coarse aggregate is 10-20 mm.

5. 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%; Optionally, in step (2), the fineness of the pseudo-wollastonite powder is 300-500 mesh; Optionally, in step (2), the fineness of the red brick powder is 100-150 mesh.

6. 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%; Optionally, in step (2), the heating temperature is 60-70° C., and the carbonization treatment time is 2-2.5 hours; Optionally, in step (2), the drying temperature is 180-220° C., and the drying time is 1-1.5 hours.

7. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to claim 1, characterized in that: 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 reducing agent.

8. 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.

9. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to any one of claims 1 to 8, characterized in that: In step (3), the fineness of the glass powder is 400-500 mesh; Optionally, in step (3), the particle size of the waste red brick coarse aggregate is 5-15 mm; Optionally, in step (3), the fiber includes one or more of basalt fiber, polyethylene fiber, polypropylene fiber, and polyacrylonitrile fiber; Optionally, in step (3), the length of the fiber is 5 to 30 mm; Optionally, in step (3), the water reducer includes one or more of a polycarboxylate water reducer, a naphthalene-based water reducer, and a lignin sulfonate water reducer.

10. The method for preparing the Yellow River sediment sand aggregate cement-based permeable brick according to any one of claims 1 to 8, characterized in that: In step (3), the curing method is natural curing at room temperature for 21 to 28 days.

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