Preparation process of Yellow River deposited sand high-strength cement-based curb material

Abstract

The invention discloses a preparation process of a Yellow River deposited sand high-strength cement-based curb material, which comprises the following steps: (1) adding mixed powder formed by pseudo-wollastonite powder and glass powder into wet chopped basalt fibers to obtain pretreated basalt fibers; and (2) carrying out heat treatment on the pretreated basalt fiber and coal gangue powder to obtain pretreated coal gangue powder and modified fiber for later use. And (3) wetting the modified fiber by using a tannic acid saturated solution, and carbonizing in a carbonization box containing carbon dioxide and water vapor to obtain the carbonized modified fiber. And (4) taking cement powder, gravel coarse aggregate, Yellow River deposited sand, fly ash, carbonized modified fiber, a water reducing agent and the like as raw materials. The preparation method comprises the following steps: uniformly mixing the raw materials, adding mixing water and uniformly mixing. According to the invention, the mechanical strength of the curb is effectively improved by adopting the fibers which have good bonding capacity with the curb matrix, and the application of the yellow river deposited sand is promoted.

Description

Technical Field

[0001] The invention relates to the technical field of cement-based material preparation, and in particular to a preparation process of a high-strength cement-based curbstone material made of Yellow River sediment sand. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

[0003] Curbstones are marker stones placed between the road surface and other structures. They are primarily used to demarcate road boundaries and define road boundaries, while also serving to guide traffic and protect the road's edge. They are an essential building material in urban road construction. Currently, curbstones are primarily cast in concrete, with some also being crafted from natural stone such as granite, marble, and bluestone. Concrete curbstones offer advantages such as cost-effectiveness, simple manufacturing processes, high efficiency, consistent quality, and durability.

[0004] Sand and gravel aggregates are essential raw materials for the concrete used to make curbstones. my country possesses a vast reservoir of Yellow River sand, which also transports 1.6 billion tons of sediment annually. Therefore, theoretically, Yellow River sand can provide ample fine aggregate for concrete. However, due to its high mud content and the mud layer coating the sand particles, a weak barrier forms between the sand and the concrete matrix. This in turn results in insufficient mechanical strength for curbstones made from this concrete, significantly limiting its application. Therefore, improving the mechanical strength of Yellow River sand concrete is an important measure to promote its application. Summary of the Invention

[0005] To address the above-mentioned issues, the present invention provides a process for preparing a high-strength cement-based curbstone material made from Yellow River sediment sand. By employing fibers that bond well with the curbstone matrix, the process effectively improves the mechanical strength of the curbstone, thereby promoting the use of Yellow River sediment sand. Specifically, the technical solution of the present invention is as follows.

[0006] A preparation process of a high-strength cement-based curbstone material made of Yellow River sediment sand comprises the following steps: (1) Add the mixed powder formed by pseudo-wollastonite powder and glass powder to the wetted chopped basalt fiber, mix them evenly, and then sieve to remove excess powder to obtain pretreated basalt fiber for later use.

[0007] (2) The pretreated basalt fiber is dispersed in coal gangue powder and then heat-treated. After completion, the mixture is cooled to room temperature and sieved. The obtained pretreated coal gangue powder and modified fiber are set aside.

[0008] (3) The pretreated gangue powder is placed in water and then polyaluminium sulfate is added for ultrasonic treatment. The solid matter is filtered out, dried and then ground to obtain modified gangue powder for later use.

[0009] (4) Wetting the modified fiber with a saturated tannic acid solution and placing it in a carbonization box containing carbon dioxide + water vapor for carbonization treatment. After the carbonization treatment is completed, the carbonized modified fiber is obtained and set aside.

[0010] (5) Take the following raw materials: cement powder, crushed stone coarse aggregate, Yellow River sediment sand, the modified coal gangue powder, fly ash, carbonized modified fiber, and water reducer. Mix the above raw materials and add mixing water to mix evenly to obtain the cement-based curb material.

[0011] Furthermore, in step (1), the mass ratio of the pseudo wollastonite powder to the glass powder is 1:0.25-0.33. Optionally, the fineness of the pseudo wollastonite powder and the glass powder is 500-800 mesh.

[0012] Furthermore, in step (1), the mass ratio of the mixed powder to the chopped basalt fibers is 0.2-0.3:1. Optionally, the length of the chopped basalt fibers is 5-15 mm.

[0013] Furthermore, in step (1), the wetting method is: immersing the chopped basalt fibers in a sodium silicate solution, stirring, and then removing the fibers. Optionally, the mass fraction of the sodium silicate solution is 4-7%.

[0014] Furthermore, in step (2), the mass ratio of the pretreated basalt fiber to the coal gangue powder is 1:2.8-4. Optionally, the fineness of the coal gangue powder is 200-400 mesh.

[0015] Furthermore, in step (2), the heat treatment temperature is higher than the softening temperature of the glass powder, and the treatment time is 30 to 40 minutes. Optionally, the softening temperature of the glass powder is 600 to 700°C.

[0016] Furthermore, in step (3), the ratio of the pretreated gangue powder to water is 1 g: 8-12 ml.

[0017] Furthermore, in step (3), the addition ratio of polyaluminum sulfate to the water is 10-20 g / L.

[0018] Furthermore, in step (3), the ultrasonic treatment time is 15 to 25 minutes. Optionally, the drying temperature is 60 to 80° C., and the drying is performed until the weight of the solid does not change.

[0019] Furthermore, in step (3), the fineness of the modified coal gangue powder is 200-400 mesh.

[0020] Furthermore, in step (4), the modified fiber is immersed in a saturated solution of tannic acid, stirred, and then the fiber is taken out to obtain a wetted modified fiber.

[0021] Furthermore, in step (4), the relative humidity in the carbonization box is maintained between 95% and 99%, and the volume proportion of carbon dioxide is 20% to 30%.

[0022] Furthermore, in step (4), the temperature of the carbonization treatment is 70-80° C., and the time is 1-2 hours.

[0023] Furthermore, in step (5), the proportions of the raw materials are: 130-150 parts by weight of cement powder, 350-420 parts by weight of crushed stone coarse aggregate, 247-310 parts by weight of Yellow River sediment sand, 20-32 parts by weight of the modified coal gangue powder, 15-28 parts by weight of fly ash, 10-20 parts by weight of the carbonized modified fiber, and 1.9-3 parts by weight of a water reducer.

[0024] Furthermore, in step (5), the mass ratio of the mixing water to the cement powder (water-cement ratio) is 0.33-0.37:1.

[0025] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects: In order to improve the mechanical properties of cement-based curb materials prepared from Yellow River sediment sand, the present invention adds modified basalt fibers, effectively overcoming the adverse effects of the high mud content of the Yellow River sediment sand on the performance of the curb. First, the present invention loads a mixed powder formed by pseudo-wollastonite powder and glass powder on the surface of the basalt fiber, and then disperses it into coal gangue powder for heat treatment. On the one hand, the melting of the glass powder is used to anchor the powder particles on the fiber surface to form a coarsening layer, thereby improving the bonding force between the fiber and the curb matrix and increasing the strength of the curb. On the other hand, dispersing the basalt fiber in the coal gangue powder not only helps prevent fiber adhesion, but also uses high temperature to remove organic matter in the coal gangue, thereby improving its stability and preventing the formation of cracks in the curb due to the instability of the coal gangue during use, which affects its service life.

[0026] Secondly, the modified fiber obtained through the above treatment is wetted with a saturated solution of tannic acid and then carbonized. The pseudo-wollastonite in the coarsened layer of the fiber reacts with carbon dioxide and water. On the one hand, the calcium reacts with carbonate ions to form aragonite-type calcium carbonate, which is effectively prevented from converting to calcite by the stabilizer tannic acid. Once incorporated into the cement-based material, this aragonite-type calcium carbonate decomposes and releases calcium ions due to instability in an alkaline environment, where the tannins become ineffective. On the other hand, the carbonized pseudo-wollastonite forms an active silica gel that is loaded onto the fiber surface. When cement-based materials prepared from these fibers are used to manufacture curbstones, during the curing process, the active silica on the fiber surface reacts with the aragonite-type calcium carbonate to release calcium ions and the calcium hydroxide produced by cement hydration to form a hydrated calcium silicate gelling component, thereby more firmly and tightly bonding the fiber to the curbstone matrix and improving the curbstone's mechanical properties.

[0027] In addition, the present invention uses a polyaluminum sulfate solution to ultrasonically treat the coal gangue powder after the above-mentioned heat treatment, so that the aluminum gel formed after the hydrolysis of the polyaluminum sulfate fills the pores formed after the removal of organic matter in the coal gangue particles. At the same time, the sulfate ions formed cause the coal gangue powder of the present invention to decompose with the aragonite-type calcium carbonate to release calcium ions, and the calcium ions generated by cement hydration react to form calcium sulfate, which further reacts with the calcium aluminate in the cement to form calcium aluminate. This gelled product with micro-expansion characteristics can not only be interwoven with the aluminum gel to further compact the pores in the coal gangue, but also increase the bonding force between the fiber and the curb matrix, thereby improving the mechanical strength of the curb. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0029] Figure 1 This is a picture of the pretreated coal gangue powder sample prepared in the following Example 1 of the present invention.

[0030] Figure 2 This is a picture of the carbonized modified fiber sample prepared in the following Example 1 of the present invention.

[0031] Figure 3 This is a compressive strength test diagram of the following Example 1 of the present invention.

[0032] Figure 4 This is a compressive strength test diagram of the following Example 2 of the present invention.

[0033] Figure 5 This is a compressive strength test diagram of the following Example 3 of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present invention only and are not intended to limit the scope of the invention. The experimental methods in the following examples, for which specific conditions are not specified, are generally performed under conventional conditions or as recommended by the manufacturer.

[0035] Unless otherwise defined, all professional and scientific terms used in the present invention have the same meaning as those familiar to those skilled in the art. The reagents or raw materials used in the present invention can be purchased through conventional channels. Unless otherwise specified, the reagents or raw materials used in the present invention are used in a conventional manner in the art or according to the product instructions. In addition, any method and material similar to or equivalent to the described content can be applied to the inventive method. Now, the technical solution of the present invention is further described in conjunction with the accompanying drawings and specific examples.

[0036] Example 1 A preparation process of a high-strength cement-based curbstone material made of Yellow River sediment sand comprises the following steps: (1) Pseudo-wollastonite powder with a fineness of 600 mesh and glass powder with a softening temperature of about 620-640°C are mixed in a mass ratio of 1:0.28 and stirred evenly. The obtained mixed powder is set aside.

[0037] (2) Immerse chopped basalt fibers with a length distribution of 5 to 15 mm in a sodium silicate solution with a mass fraction of 5%, stir for 2 minutes, and then remove the fibers to obtain wetted chopped basalt fibers. Then, mix the mixed powder with the chopped basalt fibers at a mass ratio of 0.25:1, stir evenly, and sieve to remove excess powder to obtain pretreated basalt fibers for later use.

[0038] (3) The pretreated basalt fiber and 400-mesh coal gangue powder were mixed uniformly at a mass ratio of 1:3.5, so that the fiber was dispersed in the coal gangue powder. The mixture was then heated to 700°C and kept warm for 1 hour. After completion, the mixture was cooled to room temperature and sieved. The pretreated coal gangue powder and modified fiber were set aside.

[0039] (4) The pretreated gangue powder and clean water were mixed at a ratio of 1 g: 10 ml and stirred evenly, and then polyaluminum sulfate was added to the water at a ratio of 14 g / L and ultrasonically treated for 20 minutes. The solid matter was filtered out, heated to 80 ° C and dried until the weight of the solid matter no longer changed, and then ground to obtain modified gangue powder with a fineness of 400 mesh (such as Figure 1 as shown), and keep it as a standby.

[0040] (5) Immerse the modified fiber in a saturated solution of tannic acid, stir, and take out the fiber to obtain a wet modified fiber. Then, place the wet modified fiber in a carbonization box (with a carbon dioxide volume ratio of 30%, a relative humidity of 98%, and a temperature of 70°C) for carbonization treatment for 35 minutes. After completion, a carbonized modified fiber (such as Figure 2 as shown), and keep it as a standby.

[0041] (6) Take the following raw materials: 142 parts by weight of cement (PO 42.5), 390 parts by weight of crushed stone coarse aggregate with a particle size of 5-8 mm, 285 parts by weight of Yellow River sediment sand, 26 parts by weight of the modified coal gangue powder, 22 parts by weight of fly ash, 10 parts by weight of the carbonized modified fiber, and 2.5 parts by weight of polycarboxylate water reducer. Mix the above raw materials and add 57 parts by weight of mixing water and stir evenly to obtain a cement-based curbstone material.

[0042] The cement-based curbstone material prepared in this embodiment was poured into a mold and demoulded after hardening, and then cured in a standard curing box for 28 days. The compressive strength of the specimens (such as Figure 3 The results are as follows: compressive strength = 62.17MPa, tensile strength = 11.46MPa.

[0043] Example 2 A preparation process of a high-strength cement-based curbstone material made of Yellow River sediment sand comprises the following steps: (1) Pseudo-wollastonite powder with a fineness of 800 mesh and glass powder with a softening temperature of about 585~600℃ are mixed in a mass ratio of 1:0.33 and stirred evenly. The obtained mixed powder is set aside.

[0044] (2) Immerse chopped basalt fibers with a length distribution of 5 to 15 mm in a sodium silicate solution with a mass fraction of 4%. Stir for 2 minutes and then remove the fibers to obtain wetted chopped basalt fibers. Then, mix the mixed powder with the chopped basalt fibers at a mass ratio of 0.2:1. Stir evenly and then sieve to remove excess powder to obtain pretreated basalt fibers for later use.

[0045] (3) The pretreated basalt fiber and 300-mesh coal gangue powder were mixed uniformly at a mass ratio of 1:2.8, so that the fiber was dispersed in the coal gangue powder. The mixture was then heated to 650°C and kept warm for 1.5 hours. After completion, the mixture was cooled to room temperature and sieved. The pretreated coal gangue powder and modified fiber were set aside.

[0046] (4) The pretreated gangue powder and clean water are mixed at a ratio of 1 g:12 ml and stirred evenly, and then polyaluminum sulfate is added according to the ratio of 10 g / L of polyaluminum sulfate in the water and ultrasonically treated for 25 minutes. The solid matter is filtered out, heated to 70°C and dried until the weight of the solid matter no longer changes, and then ground to obtain modified gangue powder with a fineness of 300 mesh, which is set aside.

[0047] (5) Immerse the modified fiber in a saturated solution of tannic acid, stir, and then remove the fiber to obtain a wet modified fiber. Then, place the wet modified fiber in a carbonization box (with a carbon dioxide volume ratio of 20%, a relative humidity of 95%, and a temperature of 80°C) for carbonization treatment for 30 minutes. After completion, a carbonized modified fiber is obtained and set aside.

[0048] (6) Take the following raw materials: 150 parts by weight of cement (PO 42.5), 420 parts by weight of crushed stone coarse aggregate with a particle size of 5-8 mm, 310 parts by weight of Yellow River sediment sand, 20 parts by weight of the modified coal gangue powder, 28 parts by weight of fly ash, 17 parts by weight of the carbonized modified fiber, and 3 parts by weight of polycarboxylate water reducer. Mix the above raw materials and add 66 parts by weight of mixing water to mix evenly to obtain a cement-based curbstone material.

[0049] The cement-based curbstone material prepared in this embodiment was poured into a mold and demoulded after hardening, and then cured in a standard curing box for 28 days. The compressive strength of the specimens (such as Figure 4 The results are as follows: compressive strength = 59.34MPa, tensile strength = 10.13MPa.

[0050] Example 3 A preparation process of a high-strength cement-based curbstone material made of Yellow River sediment sand comprises the following steps: (1) Pseudo-wollastonite powder with a fineness of 500 mesh and glass powder with a softening temperature of about 585~600℃ are mixed in a mass ratio of 1:0.25 and stirred evenly. The obtained mixed powder is set aside.

[0051] (2) Immerse chopped basalt fibers with a length distribution of 5 to 15 mm in a sodium silicate solution with a mass fraction of 7%. Stir for 2 minutes and then remove the fibers to obtain wetted chopped basalt fibers. Then, mix the mixed powder with the chopped basalt fibers at a mass ratio of 0.3:1. Stir evenly and then sieve to remove excess powder to obtain pretreated basalt fibers for later use.

[0052] (3) The pretreated basalt fiber and 200-mesh coal gangue powder were mixed uniformly in a mass ratio of 1:4, so that the fiber was dispersed in the coal gangue powder. The mixture was then heated to 630°C and kept warm for 1.5 hours. After completion, the mixture was cooled to room temperature and sieved. The pretreated coal gangue powder and modified fiber were set aside.

[0053] (4) The pretreated gangue powder and clean water are mixed at a ratio of 1 g:8 ml and stirred evenly, and then polyaluminum sulfate is added according to the ratio of 20 g / L of polyaluminum sulfate in the water and ultrasonically treated for 15 minutes. The solid matter is filtered out, heated to 60°C and dried until the weight of the solid matter no longer changes, and then ground to obtain modified gangue powder with a fineness of 200 mesh, which is set aside.

[0054] (5) Immerse the modified fiber in a saturated solution of tannic acid, stir, and then remove the fiber to obtain a wet modified fiber. Then, place the wet modified fiber in a carbonization box (with a carbon dioxide volume ratio of 25%, a relative humidity of 99%, and a temperature of 75°C) for carbonization treatment for 40 minutes. After completion, a carbonized modified fiber is obtained and set aside.

[0055] (6) Take the following raw materials: 130 parts by weight of cement (PO 42.5), 350 parts by weight of crushed stone coarse aggregate with a particle size of 5-8 mm, 247 parts by weight of Yellow River sediment sand, 32 parts by weight of the modified coal gangue powder, 15 parts by weight of fly ash, 20 parts by weight of the carbonized modified fiber, and 1.9 parts by weight of polycarboxylate water reducer. Mix the above raw materials and add 49.5 parts by weight of mixing water and stir evenly to obtain a cement-based curb material.

[0056] The cement-based curbstone material prepared in this embodiment was poured into a mold and demoulded after hardening, and then cured in a standard curing box for 28 days. The compressive strength of the specimens (such as Figure 5 The results are as follows: compressive strength = 64.08MPa, tensile strength = 11.95MPa.

[0057] Example 4 A preparation process of a high-strength cement-based curbstone material made of Yellow River sediment sand comprises the following steps: The following raw materials were prepared: 142 parts by weight of cement (PO 42.5), 390 parts by weight of crushed stone coarse aggregate with a particle size of 5-8 mm, 285 parts by weight of Yellow River sediment sand, 26 parts by weight of the modified coal gangue powder from Example 1, 22 parts by weight of fly ash, 10 parts by weight of chopped basalt fibers with a length distribution of 5-15 mm, and 2.5 parts by weight of a polycarboxylate superplasticizer. These raw materials were mixed thoroughly, and then 57 parts by weight of mixing water was added and stirred evenly to obtain a cement-based curbstone material.

[0058] The cement-based curb material prepared in this example was cast into a mold, hardened, and then demolded. The material was then cured in a standard curing chamber for 28 days. The compressive and tensile strengths of the specimens were tested according to the "Standard for Testing Methods for Physical and Mechanical Properties of Concrete" (GBT 50081-2019). The results were: compressive strength = 54.66 MPa, and tensile strength = 8.18 MPa.

[0059] Example 5 A preparation process of a high-strength cement-based curbstone material made of Yellow River sediment sand comprises the following steps: The following raw materials were prepared: 142 parts by weight of cement (PO 42.5), 390 parts by weight of crushed stone coarse aggregate with a particle size of 5-8 mm, 285 parts by weight of Yellow River sediment sand, 26 parts by weight of 400-mesh coal gangue powder, 22 parts by weight of fly ash, 10 parts by weight of carbonized modified fiber obtained in Example 1, and 2.5 parts by weight of a polycarboxylate water reducer. These raw materials were mixed thoroughly, and then 57 parts by weight of mixing water was added and stirred evenly to obtain a cement-based curbstone material.

[0060] The cement-based curb material prepared in this example was cast into a mold, hardened, and then demolded. The material was then cured in a standard curing chamber for 28 days. The compressive and tensile strengths of the specimens were tested according to the "Standard for Testing Methods for Physical and Mechanical Properties of Concrete" (GBT 50081-2019): 57.41 MPa for compressive strength and 10.87 MPa for tensile strength.

[0061] Example 6 A preparation process of a high-strength cement-based curbstone material made of Yellow River sediment sand comprises the following steps: Take the following raw materials: 130 parts by weight of cement (PO 42.5), 350 parts by weight of crushed stone coarse aggregate with a particle size of 5-8 mm, 247 parts by weight of Yellow River sediment sand, 32 parts by weight of modified coal gangue powder obtained according to step (4) of Example 2, 15 parts by weight of fly ash, 20 parts by weight of modified fiber obtained according to step (3) of Example 2, and 1.9 parts by weight of polycarboxylate water reducer. Mix the above raw materials, add 49.5 parts by weight of mixing water, and stir evenly to obtain a cement-based curbstone material.

[0062] The cement-based curb material prepared in this example was cast into a mold, hardened, and then demolded. The material was then cured in a standard curing chamber for 28 days. The compressive and tensile strengths of the specimens were tested according to the "Standard for Testing Methods for Physical and Mechanical Properties of Concrete" (GBT 50081-2019). The results were: compressive strength = 54.29 MPa, and tensile strength = 9.05 MPa.

[0063] Example 7 A preparation process of a high-strength cement-based curbstone material made of Yellow River sediment sand comprises the following steps: The following raw materials were prepared: 130 parts by weight of cement (PO 42.5), 350 parts by weight of crushed stone coarse aggregate with a particle size of 5-8 mm, 247 parts by weight of Yellow River sediment sand, 32 parts by weight of pretreated coal gangue powder obtained according to step (3) of Example 3, 15 parts by weight of fly ash, 20 parts by weight of carbonized modified fiber obtained according to step (3) of Example 3, and 1.9 parts by weight of polycarboxylate water reducer. The above raw materials were mixed thoroughly, and 49.5 parts by weight of mixing water was added and stirred evenly to obtain a cement-based curbstone material.

[0064] The cement-based curb material prepared in this example was cast into a mold, hardened, and then demolded. The material was then cured in a standard curing chamber for 28 days. The compressive and tensile strengths of the specimens were measured according to the "Standard for Testing Methods for Physical and Mechanical Properties of Concrete" (GBT 50081-2019): 60.23 MPa for compressive strength and 10.76 MPa for tensile strength.

[0065] Example 8 A preparation process of a high-strength cement-based curbstone material made of Yellow River sediment sand comprises the following steps: (1) Pseudo-wollastonite powder with a fineness of 800 mesh and glass powder with a softening temperature of about 585~600℃ are mixed in a mass ratio of 1:0.33 and stirred evenly. The obtained mixed powder is set aside.

[0066] (2) Immerse chopped basalt fibers with a length distribution of 5 to 15 mm in a sodium silicate solution with a mass fraction of 4%. Stir for 2 minutes and then remove the fibers to obtain wetted chopped basalt fibers. Then, mix the mixed powder with the chopped basalt fibers at a mass ratio of 0.2:1. Stir evenly and then sieve to remove excess powder to obtain pretreated basalt fibers for later use.

[0067] (3) The pretreated basalt fiber and 300-mesh coal gangue powder were mixed uniformly at a mass ratio of 1:2.8, so that the fiber was dispersed in the coal gangue powder. The mixture was then heated to 650°C and kept warm for 1.5 hours. After completion, the mixture was cooled to room temperature and sieved. The pretreated coal gangue powder and modified fiber were set aside.

[0068] (4) The pretreated gangue powder and clean water are mixed at a ratio of 1 g:12 ml and stirred evenly, and then polyaluminum sulfate is added according to the ratio of 10 g / L of polyaluminum sulfate in the water and ultrasonically treated for 25 minutes. The solid matter is filtered out, heated to 70°C and dried until the weight of the solid matter no longer changes, and then ground to obtain modified gangue powder with a fineness of 300 mesh, which is set aside.

[0069] (5) The modified fiber of step (3) is placed in a carbonization box (with a carbon dioxide volume ratio of 20%, a relative humidity of 95%, and a temperature of 80°C) for carbonization treatment for 30 minutes. After the carbonization treatment is completed, the carbonized modified fiber is obtained and set aside.

[0070] (6) Take the following raw materials: 150 parts by weight of cement (PO 42.5), 420 parts by weight of crushed stone coarse aggregate with a particle size of 5-8 mm, 310 parts by weight of Yellow River sediment sand, 20 parts by weight of the modified coal gangue powder, 28 parts by weight of fly ash, 17 parts by weight of the carbonized modified fiber, and 3 parts by weight of polycarboxylate water reducer. Mix the above raw materials and add 66 parts by weight of mixing water to mix evenly to obtain a cement-based curbstone material.

[0071] The cement-based curb material prepared in this example was cast into a mold, hardened, and then demolded. The material was then cured in a standard curing chamber for 28 days. The compressive and tensile strengths of the specimens were measured according to the "Standard for Testing Methods for Physical and Mechanical Properties of Concrete" (GBT 50081-2019): 56.16 MPa for compressive strength and 9.33 MPa for tensile strength.

[0072] Example 9 A process for preparing a high-strength cement-based curb material made from Yellow River sediment sand. Compared to Example 1, the mixed powder in this example is composed of a mixture of 600-mesh mineral powder and glass powder with a softening temperature of approximately 620-640°C in a mass ratio of 1:0.28. The cement-based curb material prepared in this example was poured into a mold, hardened, and then demolded. The material was then cured in a standard curing chamber for 28 days. The compressive and tensile strengths of the specimens were measured according to the "Standard for Test Methods for Physical and Mechanical Properties of Concrete" (GBT 50081-2019): 54.67 MPa for compressive strength and 9.64 MPa for tensile strength.

[0073] 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 process for preparing high-strength cement-based curbstone material from Yellow River sediment sand, characterized in that: The steps include: (1) Add the mixed powder formed by pseudo-wollastonite powder and glass powder to the wetted chopped basalt fiber, mix them evenly, and then sieve to remove excess powder to obtain pretreated basalt fiber for later use; (2) dispersing the pretreated basalt fiber into coal gangue powder and then performing heat treatment, cooling to room temperature and then screening, and the obtained pretreated coal gangue powder and modified fiber are respectively set aside; (3) placing the pretreated gangue powder in water, adding polyaluminium sulfate and performing ultrasonic treatment, filtering out the solid matter, drying it and then grinding it to obtain modified gangue powder for later use; (4) Wetting the modified fiber with a saturated tannic acid solution and then placing it in a carbonization box containing carbon dioxide + water vapor for carbonization treatment, and obtaining a carbonized modified fiber for standby use; (5) Take the following raw materials: cement powder, crushed stone coarse aggregate, Yellow River sediment sand, the modified coal gangue powder, fly ash, carbonized modified fiber, and water reducer; mix the above raw materials and add mixing water and stir evenly to obtain the cement-based curb material.

2. The process for preparing the high-strength cement-based curbstone material made of Yellow River sediment sand according to claim 1, characterized in that: In step (1), the mass ratio of the pseudo wollastonite powder to the glass powder is 1:0.25-0.33; optionally, the fineness of the pseudo wollastonite powder and the glass powder is 500-800 mesh.

3. The process for preparing the high-strength cement-based curbstone material made of Yellow River sediment sand according to claim 1, characterized in that: In step (1), the mass ratio of the mixed powder to the chopped basalt fiber is 0.2-0.3:1; Optionally, in step (1), the length of the chopped basalt fibers is 5 to 15 mm; Optionally, in step (1), the wetting method is: immersing the chopped basalt fibers in a sodium silicate solution, stirring, and then taking out the fibers; Optionally, the mass fraction of the sodium silicate solution is 4-7%.

4. The process for preparing the high-strength cement-based curbstone material of Yellow River sediment sand according to claim 1, characterized in that: In step (2), the mass ratio of the pretreated basalt fiber to the coal gangue powder is 1:2.8-4; optionally, the fineness of the coal gangue powder is 200-400 mesh.

5. The process for preparing the high-strength cement-based curbstone material made of Yellow River sediment sand according to claim 1, characterized in that: In step (2), the heat treatment temperature is higher than the softening temperature of the glass powder, and the treatment time is 30 to 40 minutes; optionally, the softening temperature of the glass powder is 600 to 700°C.

6. The process for preparing the high-strength cement-based curbstone material made of Yellow River sediment sand according to claim 1, characterized in that: In step (3), the ratio of the pretreated gangue powder to water is 1g:8~12ml; Optionally, in step (3), the addition ratio of polyaluminum sulfate to the water is 10-20 g / L.

7. The process for preparing the high-strength cement-based curbstone material made of Yellow River sediment sand according to claim 1, characterized in that: In step (3), the ultrasonic treatment time is 15 to 25 minutes; Optionally, the drying temperature is 60-80° C., and the drying is performed until the weight of the solid matter no longer changes; Furthermore, in step (3), the fineness of the modified coal gangue powder is 200-400 mesh.

8. The process for preparing the high-strength cement-based curbstone material made of Yellow River sediment sand according to claim 1, characterized in that: In step (4), the modified fiber is immersed in a saturated solution of tannic acid, stirred, and then the fiber is taken out to obtain a wetted modified fiber.

9. The process for preparing the high-strength cement-based curbstone material made of Yellow River sediment sand according to claim 1, characterized in that: In step (4), the relative humidity in the carbonization box is maintained between 95% and 99%, and the volume proportion of carbon dioxide is 20% to 30%; Optionally, in step (4), the carbonization treatment is carried out at a temperature of 70-80° C. and for a time of 1-2 hours.

10. The process for preparing the high-strength cement-based curbstone material made of Yellow River sediment sand according to any one of claims 1 to 9, characterized in that: In step (5), the proportions of the raw materials are: 130-150 parts by weight of cement powder, 350-420 parts by weight of crushed stone coarse aggregate, 247-310 parts by weight of Yellow River sediment sand, 20-32 parts by weight of the modified coal gangue powder, 15-28 parts by weight of fly ash, 10-20 parts by weight of the carbonized modified fiber, and 1.9-3 parts by weight of a water reducer; Optionally, in step (5), the mass ratio of mixing water to cement powder is 0.33-0.37:1.

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