Three-source solid waste fluidized solidified soil and preparation method thereof

Abstract

The present application relates to solid waste resource utilization technical field, specifically to a kind of three-source solid waste flow state solidified soil and preparation method thereof, by weight fraction, the three-source solid waste flow state solidified soil includes the following components: alkali residue slurry 60~70 parts, tertiary fly ash 10~20 parts, waste mud residue 3~10 parts, cement 10~20 parts and water reducing agent.According to application scene requirement, select control parameter, carry out scheme design, establish prediction model, realize performance prediction, and carry out mix proportion verification, response application scene requirement, form closed loop;And the correlation between microstructure and macro strength is established.The three-source solid waste flow state solidified soil provided by the present application realizes the high-mixing use of solid waste resources, and the solid waste content can reach 80~90%, the fluidity and compressive strength thereof are 160~420mm and 0.47~1.10MPa respectively, which are controllable and adjustable, and can be applied to different application scenarios.

Description

Technical Field

[0001] This invention relates to the field of solid waste resource utilization technology, and in particular to a three-source solid waste fluidized solidified soil and its preparation method. Background Technology

[0002] Fluidized solidified soil, also known as controllable low-strength material, possesses advantages such as self-flowability, adjustable density and strength, good water stability, and durability. The "flowability" and "pumpability" derived from its "self-flowability" make fluidized solidified soil easy and flexible to construct, effectively adapting to complex geological and engineering conditions, such as narrow and irregularly shaped areas, underground spaces, and underwater spaces. Therefore, fluidized solidified soil demonstrates significant technical advantages in deep foundation pits, pipe gallery trenches, mining goaf areas, backfilling of "three backs" (reclaimed land, foundation stone, and backfill), road engineering, and marine engineering erosion protection projects.

[0003] Fluidized solidified soil possesses strong inclusiveness and high compatibility, enabling the large-scale utilization of various solid wastes. This facilitates the establishment of a technical system for the co-processing of multi-source solid wastes and exhibits significant green and low-carbon characteristics. Alkali slag, fly ash, and sludge are common solid wastes, but their applications are currently limited, mostly confined to traditional compacted fillers. Their application in the multi-source co-processing of fluidized solidified soils is rare, and the dosages are low. The preparation process often focuses on speculating on the mix proportions to meet performance requirements, without linking material parameters, preparation parameters, and acceptance parameters. While the preparation process is controllable, the adjustment range is narrow, making it difficult to achieve large-scale utilization of fluidized solidified soils containing high levels of these three types of solid wastes. Summary of the Invention

[0004] The purpose of this invention is to provide a three-source solid waste fluidized solidified soil and its preparation method. The preparation of the three-source solid waste fluidized solidified soil provided by this invention is simple, and the fluidity and strength can be accurately predicted through two prediction models. The control parameters and key performance indicators can be adjusted and controlled in a timely manner, making the application scenarios of the above-mentioned three-source solid waste fluidized solidified soil more extensive.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] A fluidized solidified soil for three-source solid waste, characterized in that the fluidity of the fluidized solidified soil for three-source solid waste is 160~420mm;

[0007] By weight, the three-source solid waste fluidized solidified soil comprises the following components: 60-70 parts of alkali slag slurry, 10-20 parts of grade III fly ash, 3-10 parts of waste sludge, 10-20 parts of cement, and water-reducing agent;

[0008] The water-reducing agent accounts for 0-0.4% of the cement by mass.

[0009] The preparation method includes the following steps:

[0010] (1) Mix the alkali residue with water and stir evenly to obtain alkali residue slurry. Set a 5cm filter screen to remove impurities and obtain alkali residue slurry.

[0011] (2) When the water-reducing agent dosage is 0%, the waste sludge, grade III fly ash, cement and the alkaline slag slurry obtained in step (1) are mixed evenly, a 5cm filter screen is set up, and impurities are simply removed to obtain the three-source solid waste fluid solidified soil without water-reducing agent.

[0012] (3) When the water-reducing agent is added to the three-source solid waste fluidized solid soil, the water-reducing agent is added to the three-source solid waste fluidized solid soil without water-reducing agent obtained in step (2) to obtain the three-source solid waste fluidized solid soil with water-reducing agent.

[0013] (4) When using the three-source solid waste fluidized solidified soil obtained in step (2) or (3), based on the relationship of control parameters, it is necessary to predict the performance under engineering scenarios and to establish a fluidity prediction model and a compressive strength prediction model.

[0014] The fluidity prediction model uses the water-to-solid ratio and the dosage of water-reducing agent as variables. The fluidity prediction model is as follows:

[0015]

[0016] In the formula: The fluidity of the solidified soil from three sources of solid waste; The water-to-solid ratio; This refers to the dosage of water-reducing agent; , , The model parameters were set at experimental rates of 52.1505, 26.6612, and 90.3706.

[0017] The strength prediction model uses cement content and water-to-solid ratio as variables, and the strength prediction model is as follows:

[0018]

[0019] In the formula: The 28-day compressive strength of the fluidized solidified soil from three sources of solid waste; The water-to-solid ratio; This refers to the amount of cement added. This refers to the dosage of water-reducing agent; , , , , The model parameters were determined experimentally to be 0.16069, -2.5657, -0.8753, 0.0336, and 0.99.

[0020] Optionally, the alkali residue slurry is made by mixing the undisturbed alkali residue with water until uniform, without drying, crushing, or grinding.

[0021] Optionally, the grade III fly ash is the original grade III fly ash, without drying, crushing, or grinding;

[0022] Optionally, the waste sludge is in its original state and is not dried, crushed, or ground.

[0023] Preferably, by weight, it comprises the following components: 60 parts of alkali slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 20 parts of cement, and water-reducing agent; wherein the water-reducing agent accounts for 0 to 0.4% of the cement by mass.

[0024] Preferably, by weight, it comprises the following components: 65 parts of alkali slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 15 parts of cement, and water-reducing agent; wherein the water-reducing agent accounts for 0 to 0.4% of the cement by mass.

[0025] Preferably, by weight, it comprises the following components: 70 parts of alkali slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 10 parts of cement, and water-reducing agent; wherein the water-reducing agent accounts for 0 to 0.4% of the cement by mass.

[0026] Preferably, by weight, it comprises the following components: 62 parts of alkali slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 18 parts of cement, and water-reducing agent; wherein the water-reducing agent accounts for 0~0.4% of the cement by mass.

[0027] Preferably, by weight, it comprises the following components: 68 parts of alkali slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 12 parts of cement, and water-reducing agent; wherein the water-reducing agent accounts for 0 to 0.4% of the cement by mass.

[0028] Preferably, the wet density of the alkaline slag slurry is 1100~1150 kg / m³. 3 The organic matter content in the waste sludge is no higher than 5% by mass.

[0029] Preferably, when using the three-source solid waste fluidized solidified soil, based on the relationship between the microstructure pore characteristics and the macroscopic compressive strength, it is necessary to establish the correlation between the microstructure and the macroscopic strength in order to qualitatively and quantitatively explain the mechanical mechanism of the three-source solid waste fluidized solidified soil;

[0030] The correlation between microstructure and macroscopic intensity is established as follows:

[0031]

[0032] In the formula: The 28-day compressive strength of the fluidized solidified soil from three sources of solid waste; Microscopic porosity; , The model parameters were determined to be -0.12313 and 1.2862 through experiments.

[0033] The beneficial effects of this invention are as follows:

[0034] 1. This invention proposes a three-source solid waste fluidized solidification soil, in which the content of solid waste (alkali slag, fly ash and waste sludge) can reach 80-90%, realizing high utilization of solid waste resources and effectively improving the utilization rate of solid waste.

[0035] 2. This invention proposes a three-source solid waste fluidized solidification soil, in which alkaline slag, grade III fly ash, and waste sludge are all utilized in their original state without drying, crushing, or grinding; utilizing them in their original state helps to reduce energy consumption and costs, and achieves the effect of energy conservation and emission reduction.

[0036] 3. This invention proposes a three-source solid waste fluidized solidified soil that can adapt to different engineering categories and application scenarios. Through the flowability prediction model and the compressive strength prediction model, the controllable and adjustable properties of the three-source solid waste fluidized solidified soil are predicted and judged.

[0037] 4. This invention establishes a link between the microstructure and macroscopic strength of the fluidized solidified soil from the three sources of solid waste, and derives a model relating microscopic porosity to macroscopic compressive strength, which is beneficial for qualitative and quantitative explanation of the mechanical mechanism of the fluidized solidified soil from the three sources of solid waste. Attached Figure Description

[0038] Figure 1 The process flow of the method for preparing fluidized solidified soil from three sources provided by the present invention;

[0039] Figure 2 This invention provides a process for predicting the performance of fluidized solidified soil from three sources of solid waste.

[0040] Figure 3 The present invention provides a performance prediction model for fluidized solidified soil from three sources of solid waste.

[0041] Figure 4 The microstructure and pore distribution of the three-source solid waste fluidized solidified soil provided by this invention;

[0042] Figure 5 The microstructure and macroscopic strength relationship of the three-source solid waste fluidized solidified soil provided by this invention. Detailed Implementation

[0043] This invention provides a three-source solid waste fluidized solidified soil, wherein the fluidity of the three-source solid waste fluidized solidified soil is 160~420mm;

[0044] By weight, the three-source solid waste fluidized solidified soil comprises the following components: 60-70 parts of alkali slag slurry, 10-20 parts of grade III fly ash, 3-10 parts of waste sludge, 10-20 parts of cement, and water-reducing agent;

[0045] The water-reducing agent accounts for 0-0.4% of the cement mass. This dosage range allows for a wider adjustment range of the fluidity of the three-source solid waste fluidized soil, making it highly adaptable and able to meet the different fluidity requirements of various application scenarios. Without the water-reducing agent, the fluidity is between 160-210 mm, meeting the requirements of some applications for lower fluidity; with the water-reducing agent, the fluidity is between 260-420 mm, meeting the requirements of some applications for medium-to-high fluidity.

[0046] The preparation method includes the following steps:

[0047] (1) Mix the alkali residue with water and stir evenly to obtain alkali residue slurry. Set a 5cm filter screen to remove impurities and obtain alkali residue slurry.

[0048] (2) When the water-reducing agent dosage is 0%, the waste sludge, grade III fly ash, cement and the alkaline slag slurry obtained in step (1) are mixed evenly, a 5cm filter screen is set up, and impurities are simply removed to obtain the three-source solid waste fluid solidified soil without water-reducing agent.

[0049] (3) When the water-reducing agent is added to the three-source solid waste fluidized solid soil, the water-reducing agent is added to the three-source solid waste fluidized solid soil without water-reducing agent obtained in step (2) to obtain the three-source solid waste fluidized solid soil with water-reducing agent.

[0050] (4) When using the three-source solid waste fluidized solidified soil obtained in step (2) or (3), based on the relationship of control parameters, it is necessary to predict the performance under engineering scenarios and to establish a fluidity prediction model and a compressive strength prediction model.

[0051] The fluidity prediction model uses the water-to-solid ratio and the dosage of water-reducing agent as variables. The fluidity prediction model is as follows:

[0052]

[0053] In the formula: The fluidity of the solidified soil from three sources of solid waste; The water-to-solid ratio; This refers to the dosage of water-reducing agent; , , Using the model parameters, a predictive model is established through machine learning based on the mix proportion data set, minimizing the error between the output of the predictive model and the actual test values, and finally calibrating it;

[0054] The strength prediction model uses cement content and water-to-solid ratio as variables, and the strength prediction model is as follows:

[0055]

[0056] In the formula: The 28-day compressive strength of the fluidized solidified soil from three sources of solid waste; The water-to-solid ratio; This refers to the amount of cement added. This refers to the dosage of water-reducing agent; , , , , Using the model parameters, a predictive model is established through machine learning based on the mix proportion data set, minimizing the error between the output of the predictive model and the actual test values, and finally calibrating it;

[0057] Using the aforementioned flowability and strength prediction models, flowability and strength predictions can be performed during the initial design of the mix design. Adjustments can be made in a timely manner based on the performance requirements and application scenarios. The mix design can be screened and adjusted based on the flowability and strength prediction results, saving time and effort and providing guidance for the preparation and use of the aforementioned three-source solid waste fluidized solidified soil.

[0058] In this invention, the three-source solid waste fluidized solidified soil and the alkaline slurry are undisturbed alkaline slag mixed with water without drying, crushing, or grinding; the grade III fly ash is undisturbed grade III fly ash without drying, crushing, or grinding; and the waste sludge is undisturbed waste sludge without drying, crushing, or grinding.

[0059] A three-source solid waste fluidized solidified soil, wherein the fluidity of the three-source solid waste fluidized solidified soil is 160~420mm, and by weight, it comprises the following components: 60 parts of alkali slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 20 parts of cement and water-reducing agent; wherein the water-reducing agent accounts for 0~0.4% of the cement by mass.

[0060] A three-source solid waste fluidized solidified soil, wherein the fluidity of the three-source solid waste fluidized solidified soil is 160~420mm, and by weight, it comprises the following components: 65 parts of alkali slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 15 parts of cement and water-reducing agent; wherein the water-reducing agent accounts for 0~0.4% of the cement by mass.

[0061] A three-source solid waste fluidized solidified soil, wherein the fluidity of the three-source solid waste fluidized solidified soil is 160~420mm, and by weight, it comprises the following components: 70 parts of alkali slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 10 parts of cement and water-reducing agent; wherein the water-reducing agent accounts for 0~0.4% of the cement by mass.

[0062] A three-source solid waste fluidized solidified soil, wherein the fluidity of the three-source solid waste fluidized solidified soil is 160~420mm, and by weight, it comprises the following components: 62 parts of alkali slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 18 parts of cement and water-reducing agent; wherein the water-reducing agent accounts for 0~0.4% of the cement by mass.

[0063] A three-source solid waste fluidized solidified soil, wherein the fluidity of the three-source solid waste fluidized solidified soil is 160~420mm, and by weight, it comprises the following components: 68 parts of alkali slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 12 parts of cement and water-reducing agent; wherein the water-reducing agent accounts for 0~0.4% of the cement by mass.

[0064] This invention relates to a fluidized solidified soil for three-source solid waste. When using this soil, based on the relationship between microstructure pore characteristics and macroscopic compressive strength, it is necessary to establish a correlation between microstructure and macroscopic strength, and to correlate microscopic test results with macroscopic strength.

[0065] Synchronous analysis of the density data bridges the microscale pore characteristics with the macroscale strength properties, in order to qualitatively and quantitatively reveal the mechanical mechanism of the fluidized solidified soil from the three sources of solid waste;

[0066] The correlation between microstructure and macroscopic intensity is established as follows:

[0067]

[0068] In the formula: The 28-day compressive strength of the fluidized solidified soil from three sources of solid waste; Microscopic porosity; , These are the model parameters, calibrated through experiments. The aforementioned macro-micro relationship can be described both qualitatively and quantitatively; the more complete the reaction, the smaller the microscopic planar porosity, and the higher the macroscopic mechanical strength.

[0069] The three-source solid waste fluidized bed solidified soil provided by this invention comprises 60-70 parts of alkaline slag slurry. In one embodiment of this invention, the weight percentage of the alkaline slag slurry can be 60, 62, 65, 68, or 70 parts. In this invention, the fluidity of the three-source solid waste fluidized bed solidified soil is 160-420 mm. The three-source solid waste fluidized bed solidified soil provided by this invention utilizes alkaline slag slurry as a carrier for fluidity. Within the above-mentioned range, the fluidity of the alkaline slag slurry can be controlled and adjusted, resulting in better adjustability and adaptability of the three-source solid waste fluidized bed solidified soil. In an embodiment of this invention, the test method for the fluidity of the three-source solid waste fluidized bed solidified soil can be DBJ51T 188, the technical standard for engineering application of pre-mixed fluidized bed solidified soil.

[0070] The source of the alkali residue can be the waste residue generated from the production of soda ash using the ammonia-soda process, and its main chemical component is CaO. In the embodiments of the present invention, the alkali residue contains 34.62% CaO and 10.85% MgO, respectively, and has a moisture content of 200%.

[0071] In this invention, the wet density of the alkaline slurry is 1100~1150 kg / m³. 3 This invention controls the wet density of alkaline slag slurry within the above-mentioned range, which can provide a better fluidity carrier for the three-source solid waste fluidized solidification soil, enabling it to have a stable and dense structure under the premise of good fluidity.

[0072] In this invention, the three-source solid waste fluidized bed soil comprises 10-20 parts of grade III fly ash. As one embodiment of this invention, the weight percentage of the grade III fly ash can be 10, 12, 15, 18, or 20 parts. This invention uses grade III fly ash as a supplementary matrix soil, controlling its weight percentage within the above range, which allows it to synergistically interact with alkali slag and waste sludge to improve the pozzolanic reaction degree.

[0073] The present invention uses conventional grade III fly ash. In the embodiments of the present invention, the main chemical components of the grade III fly ash are SiO2 and Al2O3, with contents of 45.96% and 32.81%, respectively.

[0074] The three-source solid waste fluidized bed soil comprises 3-10 parts of waste sludge. In one embodiment of the invention, the waste sludge can be 5, 8, or 10 parts by weight. This invention uses waste sludge as a regulating material, controlling its weight within the above range, which provides silicon, promotes the formation of hydrated calcium silicate cementitious material, encapsulates filling soil particles and pores, and improves the strength of the three-source solid waste fluidized bed soil.

[0075] In this invention, the waste sludge can be selected as a type of soil obtained from excavation and dredging projects.

[0076] It can be used in multiple ways to prepare fluidized solidified soil for three-source solid waste. The moisture content can be selected from 0 to 60%, preferably 20 to 30%, and the mass content of organic matter should not exceed 5%.

[0077] In an embodiment of the present invention, the waste sludge is obtained from excavating river ponds, with an organic matter content of 1.4%, a water content of 28.53%, and the main chemical components are SiO2 and Al2O3, with contents of 46.60% and 15.21%, respectively.

[0078] In this invention, the three-source solid waste fluidized solidified soil comprises 10-20 parts of cement. As one embodiment of this invention, the weight percentage of cement can be 10, 15, or 20 parts. This invention uses cement as a solidifying agent, controlling its weight percentage within the aforementioned range. This ensures both the hydration reaction and the pozzolanic reaction with fly ash and clay, while also controlling the cement content to achieve energy conservation and emission reduction while meeting strength requirements.

[0079] In this invention, the cement is preferably silicate cement.

[0080] In this invention, when a water-reducing agent is added to the three-source solid waste fluidized solidified soil, the water-reducing agent accounts for 0-0.4% of the cement by mass. As one embodiment of this invention, the water-reducing agent can account for 0%, 0.1%, 0.2%, 0.3%, or 0.4% of the cement by mass. This invention controls the weight percentage of the water-reducing agent within the above range, which allows for reasonable adjustment of fluidity and has a positive effect on strength. The fluidity is within the range of 160-420 mm, providing a large adjustment range and enabling wider application scenarios.

[0081] In this invention, the water-reducing agent can be a conventional commercially available product. In an embodiment of this invention, the polycarboxylate-based high-efficiency water-reducing agent has a water reduction rate of 29%.

[0082] In this invention, the fluidity of the three-source solid waste fluidized solidified soil is 160~420mm, and the wet density is 1250~1340kg / m³. 3 The 28-day compressive strength is 0.47~1.10MPa; the three-source solid waste fluidized solidified soil can be used for backfilling of underground pipeline installation, building foundation trenches, holes, narrow spaces and non-load-bearing filling, and can be used for backfilling of abutments, culverts and walls in traffic engineering, with a wide range of application scenarios.

[0083] This invention also provides a method for preparing the three-source solid waste fluidized solidified soil described in the above technical solution, the process flow of which is as follows: Figure 1 As shown, it includes the following steps:

[0084] (1) Mix the alkali residue with water and stir evenly to obtain alkali residue slurry. Set a 5cm filter screen to remove impurities and obtain alkali residue slurry.

[0085] (2) When the water-reducing agent dosage is 0%, the waste sludge, grade III fly ash, cement and the alkaline slag slurry obtained in step (1) are mixed evenly, a 5cm filter screen is set up, and impurities are simply removed to obtain the three-source solid waste fluid solidified soil without water-reducing agent.

[0086] (3) When the water-reducing agent is added to the three-source solid waste fluidized solid soil, the water-reducing agent is added to the three-source solid waste fluidized solid soil without water-reducing agent obtained in step (2) to obtain the three-source solid waste fluidized solid soil with water-reducing agent.

[0087] (4) The three-source solid waste fluid solidified soil is sealed and cured. When the temperature is above 20℃, it is cured naturally. When the temperature is not above 20℃, it is cured according to standard.

[0088] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0089] The alkali residue used in this embodiment of the invention is alkali residue produced by the ammonia-soda process for producing soda ash. Its main chemical components are CaO and MgO, with contents of 34.62% and 10.85%, respectively, and a moisture content of 200%.

[0090] The alkali residue slurry is obtained by mixing the above-mentioned alkali residue with water until homogeneous, and the wet density of the alkali residue slurry is stable at 1100~1150 kg / m³. 3 .

[0091] In an embodiment of the present invention, the main chemical components of the tertiary fly ash are SiO2 and Al2O3, with contents of 45.96% and 32.81%, respectively.

[0092] In an embodiment of the present invention, the waste sludge is obtained from excavating river ponds, with an organic matter content of 1.4%, a water content of 28.53%, and the main chemical components are SiO2 and Al2O3, with contents of 46.60% and 15.21%, respectively.

[0093] In an embodiment of the present invention, the silicate cement has a strength grade of 42.5 MPa, an initial setting time of no earlier than 45 min, and a final setting time of no later than 600 min.

[0094] The water-reducing agent used in the embodiments of the present invention is a polycarboxylate-based high-efficiency water-reducing agent with a water-reducing efficiency of 29.0%.

[0095] Example 1

[0096] A three-source solid waste fluidized solidified soil is composed of: 70 parts of alkaline slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 10 parts of cement, and water-reducing agent.

[0097] The water-reducing agent accounts for 0% of the cement mass.

[0098] The preparation method of the three-source solid waste fluidized solidified soil is as follows:

[0099] (1) Mix the alkali residue with water and stir evenly to obtain alkali residue slurry. Set a 5cm filter screen to remove impurities and obtain alkali residue slurry.

[0100] (2) When the water-reducing agent dosage is 0%, the waste sludge, grade III fly ash, cement and the alkaline slag slurry obtained in step (1) are mixed evenly, a 5cm filter screen is set up, and impurities are simply removed to obtain the three-source solid waste fluid solidified soil without water-reducing agent.

[0101] (3) When the water-reducing agent is added to the three-source solid waste fluidized solid soil, the water-reducing agent is added to the three-source solid waste fluidized solid soil without water-reducing agent obtained in step (2) to obtain the three-source solid waste fluidized solid soil with water-reducing agent.

[0102] (4) The three-source solid waste fluid solidified soil is sealed and cured. When the temperature is above 20℃, it is cured naturally. When the temperature is not above 20℃, it is cured according to standard.

[0103] The fluidity of the three-source solid waste fluidized solidified soil is 210 mm, and the wet density is 1250 kg / m³. 3 The 28-day compressive strength is 0.47 MPa.

[0104] Example 2

[0105] The difference from Example 1 is as follows:

[0106] The water-reducing agent accounts for 0.2% of the cement by mass.

[0107] The fluidity of the three-source solid waste fluidized solidified soil is 330 mm, and the wet density is 1279 kg / m³. 3 The 28-day compressive strength is 0.53 MPa.

[0108] Example 3

[0109] The difference from Example 1 is as follows:

[0110] The water-reducing agent accounts for 0.4% of the cement by mass.

[0111] The fluidity of the three-source solid waste fluidized solidified soil is 420 mm, and the wet density is 1251 kg / m³. 3 The 28-day compressive strength is 0.57 MPa.

[0112] Example 4

[0113] A three-source solid waste fluidized solidified soil is composed of: 65 parts of alkaline slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 15 parts of cement, and water-reducing agent.

[0114] The water-reducing agent accounts for 0% of the cement mass.

[0115] The preparation method is the same as in Example 1;

[0116] The fluidity of the three-source solid waste fluidized solidified soil is 175 mm, and the wet density is 1312 kg / m³. 3 The 28-day compressive strength is 0.75 MPa.

[0117] Example 5

[0118] The difference from Example 4 is as follows:

[0119] The water-reducing agent accounts for 0.2% of the cement by mass.

[0120] The fluidity of the three-source solid waste fluidized solidified soil is 295 mm, and the wet density is 1320 kg / m³. 3 The 28-day compressive strength is 0.78 MPa.

[0121] Example 6

[0122] The difference from Example 4 is as follows:

[0123] The water-reducing agent accounts for 0.4% of the cement by mass.

[0124] The fluidity of the three-source solid waste fluidized solidified soil is 390 mm, and the wet density is 1327 kg / m³. 3 The 28-day compressive strength is 0.81 MPa.

[0125] Example 7

[0126] A three-source solid waste fluidized solidified soil comprises: 60 parts of alkaline slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 20 parts of cement, and a water-reducing agent;

[0127] The water-reducing agent accounts for 0% of the cement mass.

[0128] The preparation method is the same as in Example 1;

[0129] The fluidity of the three-source solid waste fluidized solidified soil is 160 mm, and the wet density is 1325 kg / m³. 3 The 28-day compressive strength is 0.99 MPa.

[0130] Example 8

[0131] The difference from Example 7 is as follows:

[0132] The water-reducing agent accounts for 0.2% of the cement by mass.

[0133] The fluidity of the three-source solid waste fluidized solidified soil is 260 mm, and the wet density is 1340 kg / m³. 3 The 28-day compressive strength is 1.05 MPa.

[0134] Example 9

[0135] The difference from Example 7 is as follows:

[0136] The water-reducing agent accounts for 0.4% of the cement by mass.

[0137] The fluidity of the three-source solid waste fluidized bed is 365 mm, and the wet density is 1337 kg / m³. 3 The 28-day compressive strength is 1.10 MPa.

[0138] Example 10

[0139] A three-source solid waste fluidized solidified soil is composed of: 68 parts of alkaline slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 12 parts of cement, and water-reducing agent;

[0140] The water-reducing agent accounts for 0% of the cement mass.

[0141] The preparation method is the same as in Example 1;

[0142] The fluidity of the three-source solid waste fluidized solidified soil is 195 mm, and the wet density is 1307 kg / m³. 3 The 28-day compressive strength is 0.58 MPa.

[0143] Example 11

[0144] The difference from Example 10 is as follows:

[0145] The water-reducing agent accounts for 0.2% of the cement by mass.

[0146] The fluidity of the three-source solid waste fluidized solidified soil is 310 mm, and the wet density is 1294 kg / m³. 3 The 28-day compressive strength is 0.61 MPa.

[0147] Example 12

[0148] The difference from Example 10 is as follows:

[0149] The water-reducing agent accounts for 0.4% of the cement by mass.

[0150] The fluidity of the three-source solid waste fluidized solidified soil is 400 mm, and the wet density is 1283 kg / m³. 3 The 28-day compressive strength is 0.70 MPa.

[0151] Example 13

[0152] A three-source solid waste fluidized solidified soil is composed of: 62 parts of alkaline slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 18 parts of cement, and water-reducing agent;

[0153] The water-reducing agent accounts for 0% of the cement mass.

[0154] The preparation method is the same as in Example 1;

[0155] The fluidity of the three-source solid waste fluidized solidified soil is 175 mm, and the wet density is 1314 kg / m³. 3 The 28-day compressive strength is 0.86 MPa.

[0156] Example 14

[0157] The difference from Example 13 is as follows:

[0158] The water-reducing agent accounts for 0.2% of the cement by mass.

[0159] The fluidity of the three-source solid waste solidified soil is 270 mm, and the wet density is 1328 kg / m³. 3 The 28-day compressive strength is 0.92 MPa.

[0160] Example 15

[0161] The difference from Example 13 is as follows:

[0162] The water-reducing agent accounts for 0.4% of the cement by mass.

[0163] The fluidity of the three-source solid waste fluidized solidified soil is 380 mm, and the wet density is 1321 kg / m³. 3 The 28-day compressive strength is 0.97 MPa.

[0164] Comparative Example 1

[0165] The difference from the embodiment is:

[0166] A three-source solid waste fluidized solidified soil, composed of: 85 parts of alkaline slag slurry, 0 parts of grade III fly ash, 5 parts of waste sludge, 10 parts of cement and water-reducing agent;

[0167] The water-reducing agent accounts for 0% of the cement mass.

[0168] The preparation method is the same as in Example 1;

[0169] The fluidity of the three-source solid waste fluidized solidified soil is 360 mm, and the wet density is 1210 kg / m³. 3 The 28-day compressive strength is 0.16 MPa.

[0170] Comparative Example 2

[0171] The difference from the embodiment is:

[0172] A three-source solid waste fluidized solidified soil, composed of: 85 parts of alkaline slag slurry, 0 parts of grade III fly ash, 5 parts of waste sludge, 10 parts of cement and water-reducing agent;

[0173] The water-reducing agent accounts for 0.2% of the cement by mass.

[0174] The preparation method is the same as in Example 1;

[0175] The fluidity of the three-source solid waste fluidized solidified soil is 475 mm, and the wet density is 1217 kg / m³. 3 The 28-day compressive strength is 0.21 MPa.

[0176] Comparative Example 3

[0177] The difference from the embodiment is:

[0178] A three-source solid waste fluidized solidified soil, composed of: 85 parts of alkaline slag slurry, 0 parts of grade III fly ash, 5 parts of waste sludge, 10 parts of cement and water-reducing agent;

[0179] The water-reducing agent accounts for 0.4% of the cement by mass.

[0180] The preparation method is the same as in Example 1;

[0181] The fluidity of the three-source solid waste fluidized bed is 580 mm, and the wet density is 1215 kg / m³. 3 The 28-day compressive strength is 0.24 MPa.

[0182] Comparative Example 4

[0183] The difference from the embodiment is:

[0184] A three-source solid waste fluidized solidified soil, comprising: 75 parts of alkaline slag slurry, 15 parts of grade III fly ash, 0 parts of waste sludge, 10 parts of cement, and water-reducing agent;

[0185] The water-reducing agent accounts for 0% of the cement mass.

[0186] The preparation method is the same as in Example 1;

[0187] The fluidity of the three-source solid waste fluidized solidified soil is 240 mm, and the wet density is 1228 kg / m³. 3 The 28-day compressive strength is 0.28 MPa.

[0188] Comparative Example 5

[0189] The difference from the embodiment is:

[0190] A three-source solid waste fluidized solidified soil, comprising: 75 parts of alkaline slag slurry, 15 parts of grade III fly ash, 0 parts of waste sludge, 10 parts of cement, and water-reducing agent;

[0191] The water-reducing agent accounts for 0.2% of the cement by mass.

[0192] The preparation method is the same as in Example 1;

[0193] The fluidity of the three-source solid waste fluidized solidified soil is 340 mm, and the wet density is 1230 kg / m³. 3 The 28-day compressive strength is 0.33 MPa.

[0194] Comparative Example 6

[0195] The difference from the embodiment is:

[0196] A three-source solid waste fluidized solidified soil, comprising: 75 parts of alkaline slag slurry, 15 parts of grade III fly ash, 0 parts of waste sludge, 10 parts of cement, and water-reducing agent;

[0197] The water-reducing agent accounts for 0.4% of the cement by mass.

[0198] The preparation method is the same as in Example 1;

[0199] The fluidity of the three-source solid waste fluidized solidified soil is 435 mm, and the wet density is 1239 kg / m³. 3 The 28-day compressive strength is 0.37 MPa.

[0200]

[0201] Based on Examples 1-15 and Table 1, it can be seen that the material parameters—alkali residue content, cement content, and water-to-solid ratio—significantly affect the fluidity and 28-day strength of the three-source solid waste fluidized bed soil, while having a less significant effect on wet density. As the alkali residue slurry content decreases and the cement content increases, the water-to-solid ratio decreases accordingly; the fluidity decreases accordingly, ranging from 160 to 420 mm, exhibiting a wide adjustment range and strong adaptability, meeting the requirements of JTG D30-2015 and T / CECS 1037-2022; the 28-day strength increases accordingly, generally exceeding 0.5 MPa, indicating that the three-source solid waste fluidized bed soil possesses strength potential, meeting the requirements of JTG D30-2015 and (DBJ51 / T188-2022).

[0202] Based on Examples 1-3, 4-6, 7-9, 10-12, and 13-15, and in conjunction with Table 1, it can be seen that, under the same material parameters, as the dosage of water-reducing agent increases, the wet density remains basically stable, the 28-day strength increases slightly, and the fluidity increases significantly. The increase is relatively stable, with fluidity increasing by approximately 100 mm for every 0.2% increase in water-reducing agent. This indicates that the addition of water-reducing agent has a positive effect on the 28-day strength of the three-source solid waste fluidized solidified soil, significantly improving fluidity and enhancing the environmental adaptability of the three-source solid waste fluidized solidified soil.

[0203] Based on Examples 1-15 and Comparative Examples 1-6, and referring to Table 1, it can be seen that the 28-day strength of the comparative examples is significantly lower than that of Examples 1-15. The highest 28-day compressive strength of the comparative examples is 0.37 MPa, and the lowest is 0.16 MPa, while the highest 28-day strength of the examples is 1.10 MPa, and the lowest is 0.47 MPa. That is, the highest 28-day strength of the examples is 0.73 MPa higher than that of the comparative examples; the lowest 28-day strength of the examples is 0.31 MPa higher than that of the comparative examples; and the lowest strength of the examples is also higher than that of the comparative examples, by 0.1 MPa. For the solidified soil, the strength difference between the examples and the comparative examples is very significant, indicating that the alkali slag, the tertiary fly ash, and the waste sludge have strong synergistic effects, mutually promoting the reaction and improving the strength performance of the three-source solid waste fluidized solidified soil.

[0204] The alkaline slag slurry, grade III fly ash, and waste sludge in the three-source solid waste fluidized solidified soil can be adjusted within a suitable mix ratio range to complement, synergize, and react with each other to form a stable and dense solidified soil structure that can adapt to more engineering categories and a wider range of application scenarios.

[0205] The control parameters of the three-source solid waste fluidized bed solidified soil prepared in Examples 1-15 are shown in Table 1. It is evident that the preparation parameters and mechanical parameters are influenced by the material parameters; the fluidity is mainly affected by the water-to-solid ratio and the amount of water-reducing agent; the wet density is mainly related to the water-to-solid ratio and material composition; and the compressive strength is mainly affected by the water-to-solid ratio, cement content, and water-reducing agent content. To promote the use of the three-source solid waste fluidized bed solidified soil, a performance prediction model for the three-source solid waste fluidized bed solidified soil was established and verified to ensure its wide applicability. The prediction and verification process is as follows: Figure 2 As shown, the prediction model is as follows Figure 3 As shown.

[0206] The aforementioned flowability prediction model ( Figure 3 (Left) as follows:

[0207]

[0208] In the formula: The fluidity of the solidified soil from three sources of solid waste; The water-to-solid ratio; This refers to the dosage of water-reducing agent;

[0209] The intensity prediction model ( Figure 3 (Right) as follows:

[0210]

[0211] In the formula: The 28-day compressive strength of the fluidized solidified soil from three sources of solid waste; The water-to-solid ratio; This refers to the amount of cement added. The dosage of water-reducing agent is given. The performance predictions of the three-source solid waste fluidized solidified soil are shown in Table 2 based on the prediction model. The fluidity and 28-day compressive strength predictions are accurate. The difference between the predicted and actual fluidity values ​​is between -15 and 7 mm, and the difference between the predicted and actual 28-day compressive strength values ​​is between -0.02 and 0.03 mm.

[0212]

[0213] In conjunction with Examples 1-9, and in conjunction with Figure 4 As shown in Table 1, the microstructures of the aforementioned alkali slag, tertiary fly ash, and waste sludge are loose with obvious pores. Significantly, the microstructures of Examples 1-9 are denser, with a significant reduction in pores, indicating that the alkali slag, tertiary fly ash, and waste sludge in Examples 1-9 deeply participate in the reaction, generating more hydrates to fill the pores. Binarization analysis was performed on the microstructures of the alkali slag, tertiary fly ash, waste sludge, and Examples 1-9 to obtain the porosity of the raw materials and Examples 1-9. Microporosity is defined as the ratio of the pore area to the total area of ​​the microstructure. The results are shown in Table 3. The decrease in porosity in Examples 1-9 is negatively correlated with the increase in strength, approaching a linear relationship.

[0214]

[0215] In the fluidized solidified soil composed of the three solid waste sources, the alkali slag has a high alkaline content and exhibits lime-like properties, while the fly ash and waste sludge have certain activity. Under the background of cement hydration, the three components participate in and promote the pozzolanic reaction between each other. The more reasonable the combination of alkali slag slurry, grade III fly ash, and waste sludge, and the more complete the reaction, the more dense and stable the structural system can be formed, and the higher the 28-day compressive strength.

[0216] In use, based on the relationship between microstructure pore characteristics and macroscopic compressive strength, a correlation between microstructure and macroscopic strength is established. Microscopic test results and macroscopic strength data are analyzed synchronously to bridge the pore characteristics at the microscale and the strength performance at the macroscale, thereby qualitatively and quantitatively revealing the mechanical mechanism of the fluidized solidified soil from the three sources of solid waste.

[0217] The following correlation can be established between microstructure and macroscopic strength, and see... Figure 5 :

[0218]

[0219] In the formula: The 28-day compressive strength of the fluidized solidified soil from three sources of solid waste; This refers to the microscopic porosity.

[0220] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A fluidized solidified soil for three-source solid waste and its preparation method, characterized in that, The fluidity of the three-source solid waste fluidized solidified soil is 160~420mm; By weight, the three-source solid waste fluidized solidified soil comprises the following components: 60-70 parts of alkali slag slurry, 10-20 parts of grade III fly ash, 3-10 parts of waste sludge, 10-20 parts of cement, and water-reducing agent; The water-reducing agent accounts for 0-0.4% of the cement by mass. The preparation method includes the following steps: (1) Mix the alkali residue with water and stir evenly. Set up a 5cm filter screen to remove impurities and obtain alkali residue slurry. (2) When the water-reducing agent dosage is 0%, the waste sludge, grade III fly ash, cement and the alkaline slag slurry obtained in step (1) are mixed evenly, a 5cm filter screen is set up, and impurities are simply removed to obtain the three-source solid waste fluid solidified soil without water-reducing agent. (3) When the water-reducing agent is added to the three-source solid waste fluidized solid soil, the water-reducing agent is added to the three-source solid waste fluidized solid soil without water-reducing agent obtained in step (2) to obtain the three-source solid waste fluidized solid soil with water-reducing agent. (4) When using the three-source solid waste fluidized solidified soil obtained in step (2) or (3), based on the relationship of control parameters, it is necessary to predict the performance under engineering scenarios and to establish a fluidity prediction model and a compressive strength prediction model. The fluidity prediction model uses the water-to-solid ratio and the dosage of water-reducing agent as variables. The fluidity prediction model is as follows: ， In the formula: The fluidity of the solidified soil from three sources of solid waste; The water-to-solid ratio; This refers to the dosage of water-reducing agent; , , The model parameters were calibrated through experiments. The strength prediction model uses cement content and water-to-solid ratio as variables, and the strength prediction model is as follows: ， In the formula: The 28-day compressive strength of the fluidized solidified soil from three sources of solid waste; The water-to-solid ratio; This refers to the amount of cement added. This refers to the dosage of water-reducing agent; , , , , These are the model parameters, calibrated through experiments.

2. The fluidized solidified soil for three-source solid waste and its preparation method according to claim 1, characterized in that, By weight, it includes the following components: 60 parts of alkali slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 20 parts of cement, and water-reducing agent.

3. The fluidized solidified soil for three-source solid waste and its preparation method according to claim 1, characterized in that, By weight, it includes the following components: 65 parts of alkali slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 15 parts of cement, and water-reducing agent.

4. The fluidized solidified soil for three-source solid waste and its preparation method according to claim 1, characterized in that, By weight, it includes the following components: 70 parts of alkaline slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 10 parts of cement, and water-reducing agent.

5. The fluidized solidified soil for three-source solid waste and its preparation method according to claim 1, characterized in that, By weight, it includes the following components: 62 parts of alkali slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 18 parts of cement, and water-reducing agent.

6. The fluidized solidified soil for three-source solid waste and its preparation method according to claim 1, characterized in that, By weight, it includes the following components: 68 parts of alkaline slag slurry, 15 parts of grade III fly ash, 5 parts of waste sludge, 12 parts of cement, and water-reducing agent.

7. The fluidized solidified soil for three-source solid waste and its preparation method according to claim 1, characterized in that, The wet density of the alkaline slurry is 1100~1150 kg / m³. 3 The organic matter content in the waste sludge is no higher than 5% by mass.

8. The fluidized solidified soil for three-source solid waste and its preparation method according to claim 1, characterized in that, When using the three-source solid waste fluidized solidified soil, based on the relationship between the microstructure pore characteristics and the macroscopic compressive strength, it is necessary to establish the correlation between the microstructure and the macroscopic strength in order to qualitatively and quantitatively explain the mechanical mechanism of the three-source solid waste fluidized solidified soil. The correlation between microstructure and macroscopic intensity is established as follows: ， In the formula: The 28-day compressive strength of the fluidized solidified soil from three sources of solid waste; Microscopic porosity; , These are the model parameters, calibrated through experiments.

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