Method for preparing concrete based on stone powder slag resource utilization

Abstract

The invention belongs to the technical field of building materials, and particularly relates to a method for preparing concrete based on stone powder slag resource utilization. The stone powder slag is subjected to resource utilization, the titanate modified mineral powder, the metakaolin, the additive, the water glass, the sodium hydroxide, the triethylamine and the quartz sand are matched with the stone powder slag for common use, and the components are subjected to modification treatment, so that the compressive strength of the concrete is effectively improved, the fluidity is improved, and a good anti-permeability grade is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing concrete based on resource utilization of stone powder slag. Background Art

[0002] Concrete has the characteristics of easy raw material availability, good economy and easy construction. As a basic construction material, it is widely used in infrastructure construction such as transportation, construction, municipal administration, bridges, etc. With the increase in stone production, the amount of waste stone powder and slag generated increases year by year, and a large amount of waste stone powder and slag cannot be fully utilized; using solid waste in concrete can effectively save resources, protect the environment, and create an environmentally friendly society, and using waste stone powder and slag as admixture in concrete can achieve the reuse of waste resources.

[0003] A Chinese patent (publication number CN116462484A) discloses a slag-waste marble powder-based alkali-activated high-strength concrete and its preparation method. The slag-waste marble powder-based alkali-activated high-strength concrete prepared by the invention has good physical and mechanical properties, and has the characteristics of early strength and high strength. In actual engineering, it can shorten the construction period to a certain extent and improve the construction efficiency. Compared with the complex preparation process and harsh curing conditions of traditional high-strength concrete, the invention only needs to mix the raw materials evenly and then cure at room temperature or normal temperature. At the same time, the raw materials are cheap and easy to obtain, and have high application value. However, the concrete prepared by the resource utilization of stone powder slag in the prior art has problems such as the compressive strength to be improved, insufficient fluidity, and poor impermeability, which seriously affect its actual use.

[0004] Therefore, how to utilize stone powder slag as a resource and use it together with other modified components to improve the compressive strength of concrete, enhance fluidity, and obtain a good impermeability grade has become a direction that needs to be focused on. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method for preparing concrete based on the resource utilization of stone powder slag, aiming to solve the problems of concrete prepared by resource utilization of stone powder slag in the prior art, such as the need to improve compressive strength, insufficient fluidity, and poor impermeability grade.

[0006] The present invention utilizes stone powder slag as a resource, selects titanate modified mineral powder, metakaolin, admixtures, water glass, sodium hydroxide, triethylamine and quartz sand for joint use with stone powder slag, and performs modification treatment on the components, so as to effectively improve the compressive strength of concrete, enhance fluidity, and obtain a good anti-seepage grade.

[0007] The technical solution adopted by the present invention to solve the above technical problems is as follows:

[0008] The present invention provides a method for preparing concrete based on the resource utilization of stone powder slag, comprising the following steps:

[0009] S1: By weight, add 2-4 parts of titanate coupling agent to 200-240 parts of absolute ethanol and stir evenly, then add 80-100 parts of mineral powder for modification treatment to obtain titanate-modified mineral powder;

[0010] S2: Mix 460-480 parts of titanate-modified mineral powder, 280-300 parts of metakaolin, 200-240 parts of stone powder slag and 6-8 parts of admixture and stir evenly to obtain a mixture;

[0011] S3: Mix 180-200 parts of sodium silicate, 30-40 parts of sodium hydroxide and 100-140 parts of water evenly to obtain an activator; then add the activator to the mixture, and then add 10-20 parts of triethylamine and 900-1000 parts of quartz sand and stir at high speed to obtain concrete.

[0012] As a preferred technical solution of the present invention, the conditions of the modification treatment include: controlling the temperature at 70-80°C and stirring at a speed of 600-800 r / min for 50-70 min.

[0013] The mineral powder modified by titanate has better dispersibility, can be evenly distributed in the concrete to reduce particle agglomeration, and effectively fills the pores in the concrete. By reducing the porosity, the compactness of the concrete is increased, thereby improving the compressive strength of the concrete.

[0014] As a preferred technical solution of the present invention, the metakaolin is a metakaolin composite material;

[0015] The preparation method of the metakaolin composite material includes: by weight, dissolve 10-20 parts of chitosan in 400-500 parts of acetic acid solution with a mass fraction of 2-4%, then add 16-24 parts of commercially available metakaolin for composite treatment to obtain an intermediate product; add 1-3 parts of γ-glycidoxypropyltrimethoxysilane to a mixture of 300-400 parts of deionized water and 100-200 parts of absolute ethanol and stir evenly, then add 40-60 parts of the intermediate product for coupling treatment to obtain a metakaolin composite material.

[0016] As a preferred technical solution of the present invention, the conditions of the composite treatment include: stirring at a speed of 80-100 r / min for 2-4 h, filtering, washing with water, and freeze-drying.

[0017] As a preferred technical solution of the present invention, the conditions of the coupling treatment include: under the condition of a temperature of 50-60°C, stirring at a speed of 100-200 r / min for 2-4 h, washing with water, and drying.

[0018] The chitosan introduced into the metakaolin composite material can form a thin lubricating film on the surface of metakaolin, reducing the frictional resistance between metakaolin particles, thereby improving the fluidity of concrete. At the same time, silane modification can effectively improve the dispersion of the composite material in the concrete paste, prevent aggregation between particles, and effectively increase the fluidity.

[0019] As a preferred technical solution of the present invention, the stone powder residue is a modified stone powder residue;

[0020] The preparation method of the modified stone powder residue includes: by weight, dispersing 10 - 20 parts of aluminum tripolyphosphate in 200 - 300 parts of deionized water, then adding 20 - 30 parts of stone powder residue for grinding treatment to obtain stone powder residue A; adding 20 - 30 parts of the stone powder residue A to 40 - 50 parts of methyl acrylate solution with a molar concentration of 0.1 - 0.2 mol / L for stirring treatment to obtain the modified stone powder residue.

[0021] As a preferred technical solution of the present invention, the conditions of the grinding treatment include: grinding in a closed sand mill for 60 - 80 min, drying, and pulverizing.

[0022] As a preferred technical solution of the present invention, the conditions of the stirring treatment include: stirring at 60 - 70 °C for 2 - 4 h, suction filtration, and drying at 100 - 110 °C for 6 - 8 h.

[0023] Methyl acrylate in the modified stone powder residue has hydrophobic properties, which can reduce the water molecule penetration rate, delay the intrusion of harmful ions, and effectively reduce the penetration paths of water and other harmful substances; aluminum tripolyphosphate combines with the calcium element of the stone powder residue through phosphate groups to achieve chemical passivation of concrete, and improves the impermeability grade through hydrophobic barrier + chemical passivation.

[0024] As a preferred technical solution of the present invention, the admixture is a naphthalene-based water reducer and sodium tetraborate decahydrate; the mass ratio of the naphthalene-based water reducer to sodium tetraborate decahydrate in the admixture is (1 - 2):1.

[0025] As a preferred technical solution of the present invention, the conditions of the high-speed stirring include: the rotation speed is 280 - 300 r / min, and the time is 2 - 4 min.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) In the present invention, a lubricating film is formed by introducing chitosan through a metakaolin composite material. Meanwhile, in combination with flexible polymer segments such as titanate of modified mineral powder and methyl acrylate of modified stone powder slag, the fluidity of concrete is improved through comprehensive action. In addition, one end of the titanate modifier in the modified mineral powder forms a strong chemical bond with the mineral powder, and the long-chain organic groups extending outwards are intertwined with the molecular chains of methyl acrylate in the modified stone powder slag. At the same time, epoxy groups are introduced into the metakaolin composite material through a coupling agent, and under the action of triethylamine, the epoxy groups undergo an addition reaction with methyl acrylate in the modified stone powder slag, thereby constructing a high-density network structure. This network structure reduces the pores and defects inside the concrete and makes the material more dense, improving the compressive strength while reducing the penetration channels.

[0028] (2) The mineral powder modified by titanate in the present invention has better dispersibility, can be evenly distributed in the concrete to reduce particle agglomeration, and effectively fills the pores in the concrete. By reducing the porosity, the density of the concrete is increased, thereby improving the compressive strength of the concrete.

[0029] (3) The chitosan introduced into the metakaolin composite material in the present invention can form a thin lubricating film on the surface of the metakaolin, reducing the frictional resistance between the metakaolin, and thus improving the fluidity of the concrete. At the same time, silane modification can effectively improve the dispersion of the composite material in the concrete paste, prevent aggregation between particles, and effectively improve the fluidity.

[0030] (4) Methyl acrylate in the modified stone powder slag in the present invention has hydrophobic properties, which can reduce the water molecule penetration rate, delay the intrusion of harmful ions, and effectively reduce the penetration paths of water and other harmful substances; aluminum tripolyphosphate combines with the calcium element of the stone powder slag through phosphate groups to achieve chemical passivation of the concrete, and improves the impermeability grade through hydrophobic barrier + chemical passivation. Specific Embodiments

[0031] For the convenience of understanding the present invention, the following examples are listed. Those skilled in the art should understand that the said examples are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0032] The sources of some components in the examples and comparative examples are as follows:

[0033] Mineral powder, 200 mesh, purchased from Pengzhou Yonghao Mineral Products Processing Factory;

[0034] Commercially available metakaolin, product number A00379, purchased from Wuhan Jiyesheng Chemical Co., Ltd.;

[0035] Stone powder slag, taken from the waste stone powder slag produced in the Hezhou marble mining area;

[0036] Sodium silicate, product number CG225, purchased from Shandong Zhengxing New Materials Co., Ltd.;

[0037] Sodium hydroxide, CAS No. 1310-73-2, purchased from Sinopharm Chemical Reagent Co., Ltd.;

[0038] Naphthalene series water reducing agent, product number SY-4, Anhui Shengyuan Chemical Co., Ltd.;

[0039] Sodium tetraborate decahydrate, CAS No. 1303-96-4, purchased from Sinopharm Chemical Reagent Co., Ltd.;

[0040] Quartz sand, 120 mesh, purchased from Hubei Chengfeng Chemical Co., Ltd.;

[0041] Titanate coupling agent 201, CAS No. 67691-13-8, purchased from Tianmen Hengchang Chemical Co., Ltd.;

[0042] Acetic acid, CAS No. 64-19-7, purchased from Sinopharm Chemical Reagent Co., Ltd.;

[0043] Chitosan, CAS No. 9012-76-4, purchased from Shanghai Macklin Biochemical Co., Ltd.;

[0044] γ-Glycidoxypropyltrimethoxysilane, CAS No. 2530-83-8, purchased from Shanghai Macklin Biochemical Co., Ltd.;

[0045] Aluminum tripolyphosphate, CAS No. 13939-25-8, purchased from Shanghai Macklin Biochemical Co., Ltd.;

[0046] Methyl acrylate, CAS 96-33-3, purchased from Shanghai Macklin Biochemical Co., Ltd.

[0047] Example 1

[0048] This example provides a method for preparing concrete based on the resource utilization of stone powder slag, including the following steps:

[0049] S1: By weight, add 4 parts of titanate coupling agent to 240 parts of absolute ethanol and stir evenly, then add 100 parts of mineral powder for modification treatment, control the temperature at 80 °C, and stir at a speed of 800 r / min for 50 min to obtain titanate-modified mineral powder;

[0050] S2: Mix 480 parts of titanate-modified mineral powder, 300 parts of metakaolin composite material, 240 parts of modified stone powder slag and 8 parts of admixture (4 parts of naphthalene series water reducing agent and 4 parts of sodium tetraborate decahydrate) and stir evenly to obtain a mixture;

[0051] S3: Mix 200 parts of water glass, 40 parts of sodium hydroxide, and 140 parts of water evenly to obtain an activator; then add the activator to the mixture, and further add 20 parts of triethylamine and 1000 parts of quartz sand and stir at high speed (rotation speed: 300 r / min, time: 2 min) to obtain concrete.

[0052] Preparation of the metakaolin composite material: By weight, dissolve 20 parts of chitosan in 500 parts of acetic acid solution with a mass fraction of 4%, then add 24 parts of commercially available metakaolin for composite treatment, stir at a speed of 100 r / min for 2 h, filter, wash with water, and freeze-dry to obtain an intermediate product; add 3 parts of γ-glycidoxypropyltrimethoxysilane to a mixture of 400 parts of deionized water and 200 parts of absolute ethanol and stir evenly, then add 60 parts of the intermediate product for coupling treatment, and stir at a speed of 200 r / min for 2 h at a temperature of 60 °C, wash with water, and dry to obtain the metakaolin composite material.

[0053] Preparation of the modified stone powder residue: By weight, disperse 20 parts of aluminum tripolyphosphate in 300 parts of deionized water, then add 30 parts of stone powder residue for grinding treatment, place it in a closed sand mill and grind for 80 min, dry, and crush to obtain stone powder residue A; add 30 parts of the stone powder residue A to 50 parts of methyl acrylate solution with a molar concentration of 0.2 mol / L for stirring treatment, stir at 70 °C for 2 h, filter by suction, and dry at 110 °C for 6 h to obtain the modified stone powder residue.

[0054] Example 2

[0055] This example provides a method for preparing concrete based on the resource utilization of stone powder residue, including the following steps:

[0056] S1: By weight, add 2 parts of titanate coupling agent to 200 parts of absolute ethanol and stir evenly, then add 80 parts of mineral powder for modification treatment, control the temperature at 80 °C, and stir at a speed of 800 r / min for 50 min to obtain titanate-modified mineral powder;

[0057] S2: Mix 460 parts of titanate-modified mineral powder, 280 parts of metakaolin composite material, 200 parts of modified stone powder residue, and 6 parts of additives (4 parts of naphthalene-based water reducer and 2 parts of sodium tetraborate decahydrate) evenly to obtain a mixture;

[0058] S3: Mix 180 parts of water glass, 30 parts of sodium hydroxide, and 100 parts of water evenly to obtain an activator; then add the activator to the mixture, and further add 10 parts of triethylamine and 900 parts of quartz sand and stir at high speed (rotation speed: 280 r / min, time: 4 min) to obtain concrete.

[0059] Preparation of the metakaolin composite material: By weight, 10 parts of chitosan are dissolved in 400 parts of acetic acid solution with a mass fraction of 2%, then 16 parts of commercially available metakaolin are added for composite treatment, and stirred at a speed of 80 r / min for 4 h, filtered, washed with water, and freeze-dried to obtain an intermediate product; 1 part of γ-glycidoxypropyltrimethoxysilane is added to a mixture of 300 parts of deionized water and 100 parts of absolute ethanol and stirred evenly, then 40 parts of the intermediate product are added for coupling treatment, and stirred at a speed of 100 r / min for 4 h at a temperature of 50 °C, washed with water, and dried to obtain the metakaolin composite material.

[0060] Preparation of the modified stone powder residue: By weight, 10 parts of aluminum tripolyphosphate are dispersed in 200 parts of deionized water, then 20 parts of stone powder residue are added for grinding treatment, ground in a closed sand mill for 6 min, dried, and pulverized to obtain stone powder residue A; 20 parts of the stone powder residue A are added to 40 parts of methyl acrylate solution with a molar concentration of 0.1 mol / L for stirring treatment, stirred at 60 °C for 4 h, filtered by suction, and dried at 100 °C for 8 h to obtain the modified stone powder residue.

[0061] Example 3

[0062] This example provides a method for preparing concrete based on the resource utilization of stone powder residue, including the following steps:

[0063] S1: By weight, 3 parts of titanate coupling agent are added to 220 parts of absolute ethanol and stirred evenly, then 90 parts of mineral powder are added for modification treatment, the temperature is controlled at 75 °C, and stirred at a speed of 700 r / min for 60 min to obtain titanate-modified mineral powder;

[0064] S2: 470 parts of titanate-modified mineral powder, 290 parts of metakaolin composite material, 220 parts of modified stone powder residue and 7 parts of admixtures (4 parts of naphthalene-based water reducer and 3 parts of sodium tetraborate decahydrate) are mixed and stirred evenly to obtain a mixture;

[0065] S3: 190 parts of water glass, 35 parts of sodium hydroxide and 120 parts of water are mixed evenly to obtain an activator; then the activator is added to the mixture, and 15 parts of triethylamine and 950 parts of quartz sand are added and stirred at high speed (rotation speed is 290 r / min, time is 3 min) to obtain concrete.

[0066] Preparation of the metakaolin composite material: By weight, 15 parts of chitosan are dissolved in 450 parts of acetic acid solution with a mass fraction of 3%, and then 20 parts of commercially available metakaolin are added for composite treatment. Stir at a speed of 90 r / min for 3 h, filter, wash with water, and freeze-dry to obtain an intermediate product; 2 parts of γ-glycidyletheroxypropyltrimethoxysilane are added to a mixture of 350 parts of deionized water and 150 parts of absolute ethanol and stirred evenly, and then 50 parts of the intermediate product are added for coupling treatment. Under the condition of a temperature of 55 °C, stir at a speed of 150 r / min for 3 h, wash with water, and dry to obtain the metakaolin composite material.

[0067] Preparation of the modified stone powder residue: By weight, 15 parts of aluminum tripolyphosphate are dispersed in 250 parts of deionized water, and then 25 parts of stone powder residue are added for grinding treatment. Grind in a closed sand mill for 70 min, dry, and pulverize to obtain stone powder residue A; 25 parts of the stone powder residue A are added to 45 parts of methyl acrylate solution with a molar concentration of 0.2 mol / L for stirring treatment. Stir at 65 °C for 3 h, filter by suction, and dry at 105 °C for 7 h to obtain the modified stone powder residue.

[0068] Example 4

[0069] The difference between this example and Example 1 is that commercially available mineral powder (200 mesh, purchased from Pengzhou Yonghao Mineral Products Processing Factory) is used to replace the titanate-modified mineral powder.

[0070] Example 5

[0071] The difference between this example and Example 1 is that commercially available metakaolin (product number A00379) is used to replace the metakaolin composite material.

[0072] Comparative Example 1

[0073] The difference between this comparative example and Example 1 is that 480 parts of titanate-modified mineral powder are not added to the components.

[0074] Comparative Example 2

[0075] The difference between this comparative example and Example 1 is that 300 parts of metakaolin composite material are not added to the components.

[0076] Comparative Example 3

[0077] The difference between this comparative example and Example 1 is that 240 parts of modified stone powder residue are not added to the components.

[0078] The compressive strength, fluidity, and impermeability grade of the concrete provided in the above examples and comparative examples are tested, and the test methods are as follows:

[0079] (1) Compressive strength

[0080] The compressive strength was tested according to the requirements of "GB / T 17671-2021 Test Method for Strength of Cement Mortar (ISO Method)".

[0081] (2) Fluidity

[0082] The fluidity was tested according to the requirements of "GB / T 2419-2005 Test Method for Determination of Fluidity of Cement Mortar".

[0083] (3) Impermeability grade

[0084] The impermeability grade was tested according to the requirements of "GB / T 50082-2024 Standard for Test Methods of Long-Term Performance and Durability of Concrete".

[0085] The above performance test data are shown in Table 1.

[0086] Table 1 Performance test results

[0087] 28d Compressive Strength (MPa) Flowability (mm) Impermeability Grade Example 1 102.1 224 P9 Example 2 101.5 221 P9 Example 3 102.8 223 P9 Example 4 95.7 196 P7 Example 5 96.2 199 P7 Comparative Example 1 89.4 188 P5 Comparative Example 2 90.5 180 P5 Comparative Example 3 90.3 191 P4

[0088] As can be seen from the above, the present invention realizes the resource utilization by modifying the stone powder slag, and at the same time introduces a composite material of mineral powder modified by titanate and metakaolin, effectively improving the compressive strength of concrete, enhancing the fluidity, and obtaining a good impermeability grade.

[0089] Compared with Example 1, when using commercially available mineral powder (200 mesh, purchased from Pengzhou Yonghao Mineral Products Processing Factory) to replace the mineral powder modified by titanate, the compressive strength decreases, the fluidity decreases, and the impermeability grade deteriorates (Example 4); compared with Example 1, when using commercially available metakaolin (product number A00379) to replace the metakaolin composite material, the compressive strength decreases, the fluidity decreases, and the impermeability grade deteriorates (Example 5); compared with Example 1, when not adding 480 parts of the mineral powder modified by titanate in the components, the compressive strength decreases, the fluidity decreases, and the impermeability grade deteriorates (Comparative Example 1); compared with Example 1, when not adding 300 parts of the metakaolin composite material in the components, the compressive strength decreases, the fluidity decreases, and the impermeability grade deteriorates (Comparative Example 2); compared with Example 1, when not adding 240 parts of the modified stone powder slag in the components, the compressive strength decreases, the fluidity decreases, and the impermeability grade deteriorates (Comparative Example 3).

[0090] In summary, the present invention realizes the resource utilization of stone powder slag, selects the combined use of mineral powder modified by titanate, metakaolin, admixture, water glass, sodium hydroxide, triethylamine and quartz sand with stone powder slag, and modifies the components, effectively improving the compressive strength of concrete, enhancing the fluidity, and obtaining a good impermeability grade.

Claims

1. A method for preparing concrete based on resource utilization of stone powder slag, characterized in that: The following steps are involved: S1: by weight, 2 to 4 parts of titanate coupling agent are added to 200 to 240 parts of anhydrous ethanol and stirred evenly, and then 80 to 100 parts of mineral powder are added for modification to obtain titanate modified mineral powder; S2: 460-480 parts of titanate modified mineral powder, 280-300 parts of metakaolin, 200-240 parts of stone powder slag and 6-8 parts of admixture are mixed and stirred to obtain a mixture; S3: 180-200 parts of water glass, 30-40 parts of sodium hydroxide and 100-140 parts of water are uniformly mixed to obtain an activator; then the activator is added to the mixture, and 10-20 parts of triethylamine and 900-1000 parts of quartz sand are added and stirred at high speed to obtain concrete.

2. A method for preparing concrete based on resource utilization of stone powder slag according to claim 1, characterized in that: The modification treatment conditions include: controlling the temperature to 70-80° C. and stirring at a speed of 600-800 r / min for 50-70 min.

3. The method for preparing concrete based on resource utilization of stone powder slag according to claim 1, characterized in that: The metakaolin is a metakaolin composite material; The preparation method of the metakaolin composite material comprises: dissolving 10 to 20 parts of chitosan in 400 to 500 parts of acetic acid solution with a mass fraction of 2 to 4%, and then adding 16 to 24 parts of commercially available metakaolin for composite treatment to obtain an intermediate product; adding 1 to 3 parts of γ-glycidyloxypropyltrimethoxysilane to a mixed solution of 300 to 400 parts of deionized water and 100 to 200 parts of anhydrous ethanol and stirring evenly, and then adding 40 to 60 parts of the intermediate product for coupling treatment to obtain the metakaolin composite material.

4. A method for preparing concrete based on resource utilization of stone powder slag according to claim 3, characterized in that: The conditions of the composite treatment include: stirring at a speed of 80 to 100 r / min for 2 to 4 hours, filtering, washing with water, and freeze-drying.

5. The method for preparing concrete based on resource utilization of stone powder slag according to claim 3, characterized in that: The coupling treatment conditions include: stirring at a temperature of 50 to 60° C. at a speed of 100 to 200 r / min for 2 to 4 hours, washing with water, and drying.

6. The method for preparing concrete based on resource utilization of stone powder slag according to claim 1, characterized in that: The stone powder slag is modified stone powder slag; The preparation method of modified stone powder slag comprises: dispersing 10 to 20 parts of aluminum tripolyphosphate in 200 to 300 parts of deionized water by weight, then adding 20 to 30 parts of stone powder slag for grinding treatment to obtain stone powder slag A; adding 20 to 30 parts of the stone powder slag A into 40 to 50 parts of methyl acrylate solution with a molar concentration of 0.1 to 0.2 mol / L for stirring treatment to obtain modified stone powder slag.

7. A method for preparing concrete based on resource utilization of stone powder slag according to claim 6, characterized in that: The grinding treatment conditions include: grinding in a closed sand mill for 60 to 80 minutes, drying, and crushing.

8. The method for preparing concrete based on resource utilization of stone powder slag according to claim 6, characterized in that: The stirring treatment conditions include: stirring at 60-70° C. for 2-4 hours, filtering with suction, and drying at 100-110° C. for 6-8 hours.

9. The method for preparing concrete based on resource utilization of stone powder slag according to claim 1, characterized in that: The admixture is a naphthalene-based water reducer and sodium tetraborate decahydrate; the mass ratio of the naphthalene-based water reducer to the sodium tetraborate decahydrate in the admixture is (1-2):

1.

10. The method for preparing concrete based on resource utilization of stone powder slag according to claim 1, characterized in that: The conditions for the high-speed stirring include: a rotation speed of 280 to 300 r / min and a time of 2 to 4 min.