Fluidized solidified soil prepared from engineering residue soil and preparation method thereof

Abstract

The invention discloses fluid-state solidified soil prepared from engineering residue soil and a preparation method thereof, belongs to the technical field of building materials, and aims to effectively improve the impermeability, strength and flowability of the fluid-state solidified soil and solve the problems of poor seawater erosion resistance, poor flowability, weak stability and the like of the fluid-state solidified soil in a marine environment in the prior art. A large amount of wastes such as the engineering residue soil, the fly ash and the slag powder are used, dependence on natural resources is reduced, and meanwhile, the environmental protection problem of the wastes is effectively solved. And industrial waste is converted into useful building materials, so that the recycling of resources is promoted, and the concept of sustainable development is met.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and particularly to a fluidized solidified soil prepared from construction waste soil and a preparation method thereof. Background Art

[0002] It is estimated that the current accumulated amount of urban construction waste soil has reached 10 billion tons, and the annual increase in the amount of construction waste soil reaches 300 million tons. Since the traditional treatment methods of stacking and landfill have large floor areas, low resource utilization efficiency, and are prone to environmental pollution, they can no longer meet the needs of urban development. Therefore, how to effectively utilize construction engineering waste soil and convert it into building materials with practical application value has become an urgent problem to be solved.

[0003] As a new type of building material, fluidized solidified soil can be prepared into a material with fluidity, certain strength and durability by solidifying waste construction soil and other waste materials, and is widely used in projects such as foundation pit backfilling, pipeline backfilling, trench backfilling, and marine backfilling. However, in the marine environment, chemical substances such as chlorides and sulfates in seawater are likely to corrode the solidified soil, thereby affecting the strength and durability of the solidified soil. A patent with a publication number of: CN107935509 A, and a patent name of: An anti-sulfate corrosion curing agent for solidifying marine silt, is prepared from Portland cement, granulated blast furnace slag, quicklime, fly ash, early strength enhancer, gypsum powder and liquid activator. The solidified soil mixture prepared with it has certain strength and high density, and can effectively prevent seawater erosion. However, the fluidity of the solidified soil prepared with this curing agent is poor, and better compactness can only be obtained through compaction, which causes inconvenience to the backfilling construction in the marine environment.

[0004] Therefore, developing a fluidized solidified soil material with excellent performance and good fluidity in the marine environment is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a fluidized solidified soil prepared from construction waste soil and a preparation method thereof, which can effectively improve the impermeability, strength and fluidity of the fluidized solidified soil, and solve the problems of poor seawater erosion resistance, poor fluidity and weak stability of the fluidized solidified soil in the existing technology in the marine environment.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A fluidized solidified soil prepared from construction waste soil is composed of component A raw materials and component B raw materials;

[0008] Among them, the raw materials of component A include the following raw materials in parts by weight: 800-1000 parts of engineering soil, 20-50 parts of fly ash, 30-80 parts of slag powder, 40-70 parts of cement, 5-10 parts of alkali activator, 2-5 parts of water reducer, 0.03-0.06 parts of defoamer, and 100-150 parts of water;

[0009] The raw materials of component B include the following raw materials in parts by weight: 10-30 parts of water-soluble polymer monomer, 0.03-0.07 parts of initiator, 0.02-0.05 parts of accelerator, and 5-15 parts of water.

[0010] Furthermore, the particle size of the engineering soil is ≤55 mm, and the content of particles with a particle size <5 mm does not exceed 40 wt%, and the content of organic matter does not exceed 5 wt%;

[0011] The fly ash is Class F secondary fly ash;

[0012] The slag powder is S95 grade granulated blast furnace slag powder;

[0013] The cement is ordinary Portland cement or sulfoaluminate cement.

[0014] Furthermore, the alkali activator is any one or a mixture of sodium hydroxide, sodium silicate, potassium hydroxide, sodium sulfate, etc.

[0015] Furthermore, the water reducer is a polycarboxylate water reducer; preferably, the model of the water reducer is Melflux4930F (manufacturer: BASF);

[0016] The defoamer is a polyether defoamer; preferably, the model of the defoamer is SITREN AIRVOID 315 (manufacturer: Evonik).

[0017] Furthermore, the water-soluble polymer monomer is any one or a mixture of vinyl ether, N-isopropylacrylamide, NN-methylenebisacrylamide, sodium acrylate, acrylic acid, etc.

[0018] Furthermore, the initiator is any one or a mixture of hydrogen peroxide, sodium peroxide, potassium persulfate, sodium persulfate, etc.;

[0019] The accelerator is any one or a mixture of NNNN-tetramethylethylenediamine, NN-methylenethylenediamine, sodium sulfite, sodium bisulfite, etc.

[0020] The present invention also provides a preparation method of the fluidized solidified soil prepared by using the above engineering soil, including the following steps:

[0021] (1) Weigh each raw material according to the above parts by weight;

[0022] (2) Preparation of Component A Slurry: Put engineering soil, fly ash, slag powder, and cement into a mixer, and stir at a low speed to uniformly mix the powders. After the powders are uniformly mixed, add water, alkali activator, water reducer, and defoamer in sequence, and stir at a medium speed until the slurry is uniform and there are no obvious agglomerates, obtaining Component A Slurry;

[0023] (3) Preparation of Component B Slurry: Add the weighed water-soluble polymer monomer, initiator, accelerator, and water into a stirring container, and stir at a low speed until dissolved uniformly to obtain Component B Slurry;

[0024] (4) Mixing to Prepare Fluid Solidified Soil: Slowly add Component B Slurry to Component A Slurry at a rate of 0.5 L / min under stirring, and stir evenly at a medium-high speed to obtain the final fluid solidified soil.

[0025] Furthermore, in step (2), the low-speed stirring rate is 100 rpm and the stirring time is 2 min; the medium-speed stirring rate is 200 rpm and the stirring time is 5 min.

[0026] Furthermore, in step (3), the low-speed stirring rate is 100 rpm and the stirring time is 3 min.

[0027] Furthermore, in step (4), the medium-high speed stirring rate is 300 rpm and the stirring time is 5 min.

[0028] The beneficial effects of the present invention are as follows:

[0029] Strong impermeability: In the present invention, the water-soluble polymer monomer crosslinks and polymerizes in-situ at normal temperature, causing the short polymer chains to crosslink with each other to form long-chain network structures, thus forming complex network structures. These structures combine with the network formed by the hydration products of cement and the reaction products of alkali activation to form a double network structure, improving the compactness of the material, reducing the porosity of the fluid solidified soil, and enhancing its anti-permeability performance. This effectively prevents the intrusion of corrosive substances in seawater and ensures the long-term reliability of the material in a harsh marine environment.

[0030] High fluidity: The water-soluble polymer monomer in the present invention has a dispersing effect. Through electrostatic repulsion and intermolecular interactions, the soil particles are more uniformly distributed in the solidified soil slurry, reducing the aggregation between particles, decreasing the adsorption force between particles, and thereby reducing the viscosity of the slurry and enhancing the fluidity. In addition, the polymer chains generated by the polymerization reaction of the monomer can form a lubricating layer between the soil particles, reducing the friction between particles and the flow resistance of the slurry, thus improving the fluidity.

[0031] Good durability: After adding water-soluble polymer monomers to the solidified soil paste of the present invention, a cross-linked polymer network can be formed through a polymerization reaction. These polymer chains can form connections between the cement hydration products, effectively restricting the shrinkage of cement particles through intermolecular attraction and cross-linked structures, reducing the shrinkage deformation of the solidified soil, inhibiting the generation of cracks, and thus enhancing the durability of the solidified soil.

[0032] Anti-dispersion property: The water-soluble polymer monomers of the present invention form polymer chains in the paste through a polymerization reaction. These polymer chains play a bridging role between particles such as cement, cement hydration products, engineering soil residues, and slag powder, enhancing the mutual connection and stability between particles. With the cross-linking of polymer chains, a three-dimensional network structure is formed. This network structure can not only effectively fix cement and mineral particles but also reduce the relative movement between particles, preventing excessive dispersion or agglomeration of particles under the action of water. Especially during the underwater pouring process, the formation of the polymer network effectively prevents the settlement, dispersion, or disintegration of particles, thus ensuring the stability of the solidified soil in a humid environment and maintaining the integrity of its structure.

[0033] Convenient preparation: The present invention combines peroxide initiators with amine or sulfite accelerators. Through the synergistic effect, the polymerization rate is significantly increased, the reaction temperature is reduced, and the molecular weight and molecular weight distribution of the polymer are optimized. The accelerator promotes the decomposition of the initiator by accelerating the generation of free radicals, thereby enhancing the initial polymerization rate, avoiding too high reaction temperature, and reducing the occurrence of side reactions. In addition, the accelerator can also inhibit chain transfer and chain termination reactions, making the polymerization process more stable, and finally obtaining a polymer network with uniform molecular weight and excellent performance. Thanks to the synergistic effect of the accelerator and the initiator, this fluid solidified soil can react rapidly at room temperature, the preparation process is simple and convenient, and no high-temperature treatment is required, having good prospects for industrial application.

[0034] Environmentally friendly: The present invention makes extensive use of waste materials such as engineering soil residues, fly ash, and slag powder, reducing the dependence on natural resources and effectively solving the environmental protection problems of waste materials. By converting industrial waste into useful building materials, it promotes the reuse of resources, which is in line with the concept of sustainable development. Specific embodiments

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0036] In the embodiments and comparative examples of the present invention, the water reducing agent model is Melflux 4930F (manufacturer: BASF); the defoaming agent model is SITREN AIRVOID 315 (manufacturer: Evonik).

[0037] Example 1: Flowable solidified soil prepared from construction waste

[0038] (1) Put 900 parts of construction waste, 30 parts of fly ash, 80 parts of slag powder, and 70 parts of ordinary Portland cement into a mixer and stir at a low speed (100 rpm) for 2 minutes to uniformly mix the powders. After the powders are uniformly mixed, add 150 parts of water, 3 parts of sodium hydroxide, 2 parts of sodium sulfate, 4 parts of polycarboxylate water reducing agent, and 0.03 part of polyether defoaming agent in sequence, and stir at a medium speed (200 rpm) for 5 minutes to ensure that the slurry is uniform and there are no obvious agglomerates, obtaining Slurry A;

[0039] (2) Add 10 parts of vinyl ether, 0.03 part of hydrogen peroxide, 0.03 part of NNNN-tetramethylethylenediamine, and 8 parts of water into a stirring container, and stir at a low speed (100 rpm) for 3 minutes to ensure uniform dissolution, obtaining Slurry B;

[0040] (3) Slowly add Slurry B to Slurry A at a rate of 0.5 L / min under stirring, and stir at a medium-high speed (300 rpm) for 5 minutes to obtain flowable solidified soil.

[0041] Example 2: A kind of flowable solidified soil prepared from construction waste

[0042] (1) Put 950 parts of construction waste, 40 parts of fly ash, 60 parts of slag powder, and 50 parts of ordinary Portland cement into a mixer and stir at a low speed (100 rpm) for 2 minutes to uniformly mix the powders. After the powders are uniformly mixed, add 120 parts of water, 2 parts of potassium hydroxide, 4 parts of sodium silicate, 3 parts of polycarboxylate water reducing agent, and 0.03 part of polyether defoaming agent in sequence, and stir at a medium speed (200 rpm) for 5 minutes to ensure that the slurry is uniform and there are no obvious agglomerates, obtaining Slurry A;

[0043] (2) Add 13 parts of sodium acrylate, 5 parts of NN-methylenebisacrylamide, 0.02 part of sodium persulfate, 0.03 part of potassium persulfate, 0.01 part of NN-methylenethylenediamine, 0.02 part of sodium sulfite, and 10 parts of water into a stirring container, and stir at a low speed (100 rpm) for 3 minutes to ensure uniform dissolution, obtaining Slurry B;

[0044] (3) Slowly add Slurry B to Slurry A at a rate of 0.5 L / min under stirring, and stir at a medium-high speed (300 rpm) for 5 minutes to obtain flowable solidified soil.

[0045] Example 3: A fluidized solidified soil prepared from construction waste

[0046] (1) Put 1000 parts of construction waste, 30 parts of fly ash, 50 parts of granulated blast furnace slag powder, and 60 parts of ordinary Portland cement into a mixer, and stir at a low speed (100 rpm) for 2 minutes to uniformly mix the powders. After the powders are uniformly mixed, add 130 parts of water, 2 parts of sodium hydroxide, 5 parts of potassium hydroxide, 2.5 parts of polycarboxylate water reducer, and 0.03 parts of polyether defoamer in sequence, and stir at a medium speed (200 rpm) for 5 minutes to ensure that the slurry is uniform and there are no obvious agglomerates, obtaining Slurry A;

[0047] (2) Add 13 parts of acrylic acid, 17 parts of sodium acrylate, 0.03 parts of hydrogen peroxide, 0.02 parts of sodium persulfate, 0.04 parts of NN - methylene bisacrylamide and 9 parts of water to a stirring container, and stir at a low speed (100 rpm) for 3 minutes to ensure uniform dissolution, obtaining Slurry B;

[0048] (3) Slowly add Slurry B to Slurry A at a rate of 0.5 L / min under stirring, and stir at a medium - high speed (300 rpm) for 5 minutes to obtain the fluidized solidified soil.

[0049] Example 4: A fluidized solidified soil prepared from construction waste

[0050] (1) Put 900 parts of construction waste, 20 parts of fly ash, 30 parts of granulated blast furnace slag powder, and 55 parts of ordinary Portland cement into a mixer, and stir at a low speed (100 rpm) for 2 minutes to uniformly mix the powders. After the powders are uniformly mixed, add 140 parts of water, 5 parts of sodium silicate, 2 parts of sodium sulfate, 4 parts of polycarboxylate water reducer, and 0.03 parts of polyether defoamer in sequence, and stir at a medium speed (200 rpm) for 5 minutes to ensure that the slurry is uniform and there are no obvious agglomerates, obtaining Slurry A;

[0051] (2) Add 20 parts of N - isopropylacrylamide, 0.07 parts of sodium peroxide, 0.05 parts of sodium sulfite and 8 parts of water to a stirring container, and stir at a low speed (100 rpm) for 3 minutes to ensure uniform dissolution, obtaining Slurry B;

[0052] (3) Slowly add Slurry B to Slurry A at a rate of 0.5 L / min under stirring, and stir at a medium - high speed (300 rpm) for 5 minutes to obtain the fluidized solidified soil.

[0053] Example 5: A fluidized solidified soil prepared from construction waste

[0054] (1) Put 850 parts of construction waste soil, 50 parts of fly ash, 60 parts of slag powder, and 40 parts of ordinary Portland cement into a mixer and stir at a low speed (100 rpm) for 2 minutes to uniformly mix the powders. After the powders are uniformly mixed, add 110 parts of water, 10 parts of potassium hydroxide, 3.5 parts of polycarboxylate water reducer, and 0.04 part of polyether defoamer in sequence, and stir at a medium speed (200 rpm) for 5 minutes to ensure that the slurry is uniform and there are no obvious agglomerates, obtaining Slurry A;

[0055] (2) Add 5 parts of N-isopropylacrylamide, 8 parts of acrylic acid, 0.03 part of potassium persulfate, 0.03 part of sodium persulfate, 0.01 part of NNNN-tetramethylethylenediamine, 0.02 part of sodium bisulfite, and 12 parts of water into a stirring container and stir at a low speed (100 rpm) for 3 minutes to ensure uniform dissolution, obtaining Slurry B;

[0056] (3) Slowly add Slurry B to Slurry A at a rate of 0.5 L / min under stirring, and stir at a medium-high speed (300 rpm) for 5 minutes to obtain fluidized solidified soil.

[0057] Example 6 A kind of fluidized solidified soil prepared by using construction waste soil

[0058] (1) Put 800 parts of construction waste soil, 40 parts of fly ash, 70 parts of slag powder, and 55 parts of sulfoaluminate cement into a mixer and stir at a low speed (100 rpm) for 2 minutes to uniformly mix the powders. After the powders are uniformly mixed, add 130 parts of water, 1 part of sodium hydroxide, 6 parts of sodium silicate, 4 parts of polycarboxylate water reducer, and 0.05 part of polyether defoamer in sequence, and stir at a medium speed (200 rpm) for 5 minutes to ensure that the slurry is uniform and there are no obvious agglomerates, obtaining Slurry A;

[0059] (2) Add 16 parts of N-isopropylacrylamide, 6 parts of NN-methylenebisacrylamide, 0.03 part of hydrogen peroxide, 0.02 part of sodium persulfate, 0.04 part of NN-methylenediamine, and 12 parts of water into a stirring container and stir at a low speed (100 rpm) for 3 minutes to ensure uniform dissolution, obtaining Slurry B;

[0060] (3) Slowly add Slurry B to Slurry A at a rate of 0.5 L / min under stirring, and stir at a medium-high speed (300 rpm) for 5 minutes to obtain fluidized solidified soil.

[0061] Example 7 A kind of fluidized solidified soil prepared by using construction waste soil

[0062] (1) 900 parts of construction slag, 40 parts of fly ash, 50 parts of slag powder, and 45 parts of sulphoaluminate cement were put into a mixer and stirred at a low speed (100 rpm) for 2 minutes to make the powders uniformly mixed. After the powders were uniformly mixed, 130 parts of water, 4 parts of sodium sulfate, 3 parts of potassium hydroxide, 5 parts of polycarboxylic acid water reducer, and 0.06 parts of polyether defoamer were added in sequence and stirred at a medium speed (200 rpm) for 5 minutes to ensure that the slurry was uniform and free of obvious agglomerates, thereby obtaining component A slurry;

[0063] (2) 8 parts of sodium acrylate, 18 parts of NN-methylenebisacrylamide, 0.03 parts of potassium persulfate, 0.03 parts of hydrogen peroxide, 0.01 parts of NNNN-tetramethylethylenediamine, 0.01 parts of sodium sulfite and 14 parts of water were added to a stirring container and stirred at a low speed (100 rpm) for 3 minutes to ensure uniform dissolution, thereby obtaining a component B slurry;

[0064] (3) Slowly add the B component slurry into the A component slurry while stirring, and stir at medium-high speed (300 rpm) for 5 minutes to obtain fluidized solidified soil.

[0065] Comparative Example 1

[0066] 900 parts of construction slag, 30 parts of fly ash, 80 parts of slag powder, and 70 parts of ordinary Portland cement were put into a mixer and stirred at a low speed (100 rpm) for 2 minutes to make the powders uniformly mixed. After the powders were evenly mixed, 150 parts of water, 3 parts of sodium hydroxide, 2 parts of sodium sulfate, 4 parts of polycarboxylic acid water reducer, and 0.03 parts of polyether defoamer were added in sequence and stirred at a medium speed (200 rpm) for 5 minutes to ensure that the slurry was uniform and there was no obvious agglomerate to obtain fluidized solidified soil.

[0067] Comparative Example 2

[0068] The preparation method of Example 1 is adopted, and the raw materials used for fluidized solidified soil are:

[0069] Component A: 950 parts of construction slag, 40 parts of fly ash, 60 parts of slag powder, 50 parts of ordinary Portland cement, 6 parts of alkali activator (a mixture of 4 parts of sodium silicate and 2 parts of potassium hydroxide), 3 parts of polycarboxylic acid water reducer, and 0.03 parts of polyether defoamer.

[0070] Component B: 18 parts of water-soluble high molecular monomer (a mixture of 13 parts of sodium acrylate and 5 parts of NN-methylenebisacrylamide), 0.05 parts of initiator (a mixture of 0.02 parts of sodium persulfate and 0.03 parts of potassium persulfate).

[0071] Comparative Example 3

[0072] The preparation method of Example 1 is adopted, and the raw materials used for fluidized solidified soil are:

[0073] Component A: 950 parts of construction waste soil, 40 parts of fly ash, 60 parts of slag powder, 50 parts of ordinary Portland cement, 6 parts of alkali activator (a mixture of 4 parts of sodium silicate and 2 parts of potassium hydroxide), 3 parts of polycarboxylate water reducer, 0.03 part of polyether defoamer.

[0074] Component B: 18 parts of water-soluble polymer monomer (a mixture of 13 parts of sodium acrylate and 5 parts of NN-methylenebisacrylamide), 0.03 part of accelerator (a mixture of 0.01 part of NN-methylethylenediamine and 0.02 part of sodium sulfite).

[0075] Comparative Example 4

[0076] Using the preparation method of Example 1, the raw materials used for the fluidized solidified soil are:

[0077] Component A: 950 parts of construction waste soil, 40 parts of fly ash, 60 parts of slag powder, 50 parts of ordinary Portland cement, 6 parts of alkali activator (a mixture of 4 parts of sodium silicate and 2 parts of potassium hydroxide), 3 parts of polycarboxylate water reducer, 0.03 part of polyether defoamer.

[0078] Component B: 18 parts of water-soluble polymer monomer (acrylamide), 0.05 part of initiator (a mixture of 0.02 part of sodium persulfate and 0.03 part of potassium persulfate), 0.03 part of accelerator (a mixture of 0.01 part of NN-methylethylenediamine and 0.02 part of sodium sulfite).

[0079] Test Example

[0080] The fluidity, unconfined compressive strength, setting time, anti-seepage coefficient and water stability coefficient of the fluidized solidified soil prepared in the above examples and comparative examples were measured. The test results are shown in Table 1.

[0081] Table 1

[0082]

[0083]

[0084] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A fluidized solidified soil prepared using engineering slag, characterized in that: It is composed of component A raw materials and component B raw materials; The raw materials of component A include the following raw materials in parts by weight: 800-1000 parts of construction slag, 20-50 parts of fly ash, 30-80 parts of slag powder, 40-70 parts of cement, 5-10 parts of alkali activator, 2-5 parts of water reducer, 0.03-0.06 parts of defoamer, and 100-150 parts of water; The raw materials of component B include the following raw materials in parts by weight: 10 to 30 parts of water-soluble high molecular monomer, 0.03 to 0.07 parts of initiator, 0.02 to 0.05 parts of accelerator, and 5 to 15 parts of water.

2. The fluidized solidified soil prepared by using engineering slag according to claim 1, characterized in that: The alkaline activator is any one or more mixtures of sodium hydroxide, sodium silicate, potassium hydroxide and sodium sulfate.

3. The fluidized solidified soil prepared by using engineering slag according to claim 2, characterized in that: The water reducing agent is a polycarboxylic acid water reducing agent, and the defoaming agent is a polyether defoaming agent.

4. The fluidized solidified soil prepared by using engineering slag according to claim 1, characterized in that: The water-soluble high molecular monomer is a mixture of any one or more of vinyl ether, N-isopropyl acrylamide, NN-methylenebisacrylamide, sodium acrylate and acrylic acid.

5. The fluidized solidified soil prepared by using engineering slag according to claim 4, characterized in that: The initiator is any one or more of hydrogen peroxide, sodium peroxide, potassium persulfate, and sodium persulfate; The accelerator is any one or more of NNNN-tetramethylethylenediamine, NN-methyleneethylenediamine, sodium sulfite and sodium bisulfite.

6. A method for preparing fluidized solidified soil using engineering slag, characterized in that: The following steps are involved: (1) Weighing each raw material according to the weight proportions described in any one of claims 1 to 5; (2) Preparation of component A slurry: Put construction waste soil, fly ash, slag powder and cement into a mixer and stir at a low speed to mix the powders evenly. After the powders are evenly mixed, add water, alkali activator, water reducer and defoamer in sequence and stir at a medium speed until the slurry is uniform and there is no obvious agglomerate, thus obtaining component A slurry; (3) Preparation of component B slurry: adding the weighed water-soluble polymer monomer, initiator, accelerator and water into a stirring container, stirring at a low speed until the mixture is uniformly dissolved, to obtain component B slurry; (4) Mixing to prepare fluidized solidified soil: Slowly add the B component slurry to the A component slurry at a rate of 0.5 L / min while stirring, and stir evenly at medium to high speed to obtain the final fluidized solidified soil.

7. The method for preparing fluidized solidified soil using construction waste soil according to claim 6, characterized in that: In step (2), the low-speed stirring rate is 100 rpm, and the stirring time is 2 min; the medium-speed stirring rate is 200 rpm, and the stirring time is 5 min.

8. The method for preparing fluidized solidified soil using construction waste soil according to claim 6, characterized in that: In step (3), the low-speed stirring rate is 100 rpm and the stirring time is 3 min.

9. The method for preparing fluidized solidified soil using construction waste soil according to claim 6, characterized in that: The medium-high speed stirring rate in step (4) is 300 rpm and the stirring time is 5 min.

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