Fluidized solidified soil as well as preparation method and application construction method thereof

Abstract

The invention relates to the technical field of civil engineering materials, and discloses flow-state solidified soil as well as a preparation method and an application construction method thereof. The flow-state solidified soil comprises muck and a modified material, wherein the modified material comprises a main cementing material and an exciting agent; the muck is low-liquid-limit silt with the optimal water content of 16.3% and the maximum dry density of 1.742 g / cm < 2 >; the main cementing material comprises cement, fly ash, mineral powder and desulfurized gypsum; the exciting agent is selected from at least one of sodium silicate and calcium oxide compounded sodium carbonate. The coal ash, the mineral powder, the desulfurized gypsum and other solid wastes are effectively utilized, so that the defects that single cement modification only depends on cement hydration, the cementing efficiency is low and the carbon emission is high are overcome. According to the preparation method of the flow-state solidified soil, the obtained flow-state solidified soil is high in stability and high in compressive strength through the steps of muck pretreatment, modified material mixing and composite stirring, and the unconfined compressive strength of a prepared test piece after the prepared test piece is cured for 56 days reaches 11.2 MPa.

Description

Technical Field

[0001] This application relates to the field of civil engineering materials technology, and in particular to a fluidized solidified soil and its preparation and application construction methods. Background Technology

[0002] In road construction, the performance of subgrade filling materials plays a crucial role in the quality of the project. The rational utilization of construction waste, such as mine overburden and construction spoil, has always been a focus of attention in the industry. Applying it to subgrade filling can not only solve the problem of waste disposal but also achieve effective resource utilization, resulting in significant economic and environmental benefits.

[0003] However, construction waste soil has low natural strength and poor water stability, easily loosening and disintegrating when exposed to water, making it unable to directly meet the bearing capacity requirements of roadbed filling. Furthermore, roadbed materials must withstand long-term environmental effects; construction waste soil is prone to structural damage and significant strength loss under wet-dry and freeze-thaw cycles, resulting in insufficient durability. Therefore, modification methods are often used to improve its performance. Cement modification is a common method, adding cement to the waste soil to improve its strength to some extent, enabling it to meet some roadbed filling requirements. In addition, some studies have attempted to use industrial solid waste such as fly ash and mineral powder for simple mixing and modification, hoping to improve the performance of the waste soil. However, traditional cement modification has high carbon emissions, and existing technologies lack sufficient research on the synergistic mechanisms of fly ash, mineral powder, and other solid wastes, and there is a lack of specific formulation and processes for fluidized solidification soils tailored to construction waste soil. Summary of the Invention

[0004] To at least overcome one of the problems existing in the prior art, one objective of this application is to provide a fluidized solidified soil, which comprises slag and modified materials. The modified materials include a main cementitious material and an activator. The main cementitious material is a combination of cement, fly ash, mineral powder, and desulfurized gypsum, rather than traditional single cement. Through the synergistic effect of physical filling and chemical cementation, it overcomes the shortcomings of single cement modification, which relies solely on cement hydration, has low bonding efficiency, and high carbon emissions. Furthermore, it effectively utilizes solid wastes such as fly ash, mineral powder, and desulfurized gypsum, reducing pollution from solid waste stockpiling. A second objective of this application is to provide a method for preparing the fluidized solidified soil. A third objective of this application is to provide a method for applying and constructing the fluidized solidified soil.

[0005] Therefore, this application adopts the following technical solution: The first aspect of this application provides a fluidized solidified soil, which comprises slag and modified materials; the modified materials include a primary cementitious material and an activator; the slag has an optimum moisture content of 16.3% and a maximum dry density of 1.742 g / cm³. 3The low liquid limit silt; the main cementing material includes cement, fly ash, mineral powder and desulfurized gypsum; the activator is selected from at least one of sodium silicate, calcium oxide and sodium carbonate.

[0006] In this application's technical solution, the fluidized solidified soil includes slag and modified materials, with an optimum moisture content of 16.3% and a maximum dry density of 1.742 g / cm³. 3 The waste soil provides a stable foundation for subsequent modification, reducing the instability of modification effects caused by fluctuations in waste soil properties and realizing the resource utilization of waste soil. The modifying materials include main cementitious materials and activators. The main cementitious materials include cement, fly ash, mineral powder and desulfurized gypsum. Among them, the particles of fly ash play a physical filling role in the waste soil, the active components of mineral powder react with the activator to generate cement products, and desulfurized gypsum can promote the development of early strength. The synergistic effect of "physical filling and chemical cementation" makes up for the shortcomings of single cement modification, which relies only on cement hydration, has low cementing efficiency and high carbon emissions, and is in line with the environmental protection concept of "treating waste with waste".

[0007] Preferably, the cement is P.O42.5 ordinary Portland cement.

[0008] Preferably, the fly ash is Class II fly ash.

[0009] Preferably, the mineral powder has a specific surface area ≥ 420 m². 2 / kg of slag powder.

[0010] Preferably, the desulfurized gypsum is an industrial by-product of desulfurization.

[0011] P.O42.5 ordinary Portland cement possesses stable hydration activity, providing sufficient cementitious foundation even at low dosages. This prevents low strength or slow strength development in the solidified soil due to insufficient cement activity. Simultaneously, its relatively moderate heat of hydration reduces internal cracks caused by excessive heat of hydration in the solidified soil, ensuring structural integrity. Grade II fly ash, compared to Grade III fly ash, has finer particles and fewer impurities, facilitating the full filling of pores in the soil. Furthermore, Grade II fly ash has a lower loss on ignition, minimizing interference with the formation of cementitious products and ensuring that fly ash, cement, and mineral powder participate in the hydration reaction to form CSH gel. Specific surface area ≥ 420 m² 2The high specific surface area of ​​slag powder (approximately 0.5 kg / kg) results in a larger contact area between the powder and activators, making the activator's effect easier to achieve. Simultaneously, the high specific surface area of ​​the powder leads to better particle dispersion, reducing the agglomeration of cementing products and resulting in a more uniform internal structure of the fluidized solidified soil. Industrial by-product desulfurization gypsum, a major solid waste from industries such as thermal power and steel, can be incorporated into the main cementing material. This not only replaces natural gypsum, reducing raw material costs, but also ensures stable participation in the reaction due to the high content of calcium sulfate dihydrate, avoiding instability in modification effects caused by fluctuations in gypsum purity.

[0012] Preferably, the activator is sodium silicate, and the sodium silicate is liquid sodium silicate with a modulus of 2.8 to 3.2 and a Baume degree of 38 to 40 Be'. More preferably, the activator is sodium silicate, and the sodium silicate is liquid sodium silicate with a modulus of 2.8 to 3.0 and a Baume degree of 38 to 40 Be'.

[0013] Sodium silicate with a modulus (molar ratio of SiO2 to Na2O) of 2.8–3.2 exhibits excellent activation effects on mineral powder and fly ash. A modulus that is too low can easily lead to a decline in the later strength of the fluidized solidified soil; a modulus that is too high results in a slow activation reaction rate and insufficient early strength. A Baume degree of 38–40 corresponds to an appropriate concentration of sodium silicate solution. A concentration that is too low will result in insufficient effective components of the activator and a weak activation effect; a concentration that is too high will result in excessive viscosity and uneven mixing with the main cementitious material, leading to localized over-activation or under-activation, affecting the uniformity of the fluidized solidified soil. Simultaneously defining the modulus and Baume degree parameters ensures that the reaction rates of sodium silicate with cement, mineral powder, and fly ash are matched, avoiding internal stress expansion or contraction caused by mismatched reaction rates, reducing crack formation, and improving the durability of the fluidized solidified soil.

[0014] Preferably, in the modified material, the weight ratio of cement, fly ash and mineral powder is (0.1-8):(20-30):(38-45).

[0015] Preferably, in the modified material, the weight ratio of cement, fly ash, mineral powder and desulfurized gypsum is (0.1-8):(20-30):(38-45):(10-20).

[0016] Preferably, in the modified material, the weight ratio of cement, fly ash, mineral powder, desulfurized gypsum, and activator is (0.1-8):(20-30):(38-45):(10-20):(7.3-11.5).

[0017] By adopting the above technical solution and rationally proportioning the weight parts of each raw material in the modified material, the fluidized solidified soil can have good performance, give full play to the synergistic effect between cement, fly ash, mineral powder, desulfurized gypsum and activator, improve the strength, stability and other properties of the fluidized solidified soil, and achieve the effect of low carbon and environmental protection.

[0018] Preferably, the weight ratio of the slag to the modified material is (90-100):(10-15).

[0019] This application's technical solution uses slag as a base material to prepare fluidized solidified soil, realizing the resource utilization of slag and solving the problem of slag treatment. It uses cement, fly ash, mineral powder, and desulfurized gypsum as the main cementing materials, and at least one of sodium silicate, calcium oxide, and sodium carbonate as an activator, which can effectively activate the activity of the slag and improve the strength and stability of the fluidized solidified soil. By using a specific weight ratio of slag and modified materials, both can fully exert their effects, further optimizing the performance of the fluidized solidified soil and ensuring its quality and effectiveness.

[0020] A second aspect of the present invention provides a method for preparing fluidized solidified soil according to the first aspect of the present invention, comprising the following steps: S1: Pre-treatment of slag: Crush and sieve the original slag, take the sieved slag, add water to adjust the fluidity, and obtain the base mud; S2: Modified material mixing: Mix the main cementitious material, dry mix, then add the activator, stir, and obtain the modified material; S3: Composite mixing: Add the modified material to the base mud and mix to obtain fluidized solidified soil.

[0021] Preferably, in step S1, the flowability is adjusted to 190–205 mm. More preferably, in step S1, the flowability is adjusted to 195–205 mm. Even more preferably, in step S1, the flowability is adjusted to 195–202 mm.

[0022] Preferably, in step S2, the dry mixing time is 2-3 minutes, and after adding the activator, the stirring time is 3-5 minutes. More preferably, in step S2, the dry mixing time is 3 minutes, and after adding the activator, the stirring time is 5 minutes.

[0023] Preferably, in step S3, the stirring time is 5 to 8 minutes. More preferably, in step S3, the stirring time is 6 to 8 minutes.

[0024] In step S1, the pretreatment of slag and soil involves crushing and sieving to remove large particles of impurities. Adding water to adjust the fluidity can adjust the low liquid limit silt to a suitable flow state. The simmering process ensures that the moisture is evenly distributed among the slag and soil particles, avoiding the problem of local strength differences after modification due to uneven moisture content.

[0025] Step S2 involves first dry-mixing the main cementitious material, then adding the activator and stirring. Dry mixing allows the cement, fly ash, mineral powder, and desulfurized gypsum particles to come into full contact, avoiding clumping that occurs during wet mixing. Adding the activator ensures that it evenly coats the main cementitious material particles, preventing local aggregation of the activator. Compared to "mixing all components together," this step improves the uniformity of the activation reaction, ensuring consistent overall activity of the modified material and laying a uniform cementitious foundation for subsequent bonding with the base mud.

[0026] Step S3 involves mixing the modified material with the base mud and stirring for 5 to 8 minutes. This ensures that the modified material is evenly dispersed among the soil particles, avoiding the problem of insufficient local modification. It also avoids the situation where the viscosity of the fluidized solidified soil increases due to excessive stirring time.

[0027] The third aspect of this application provides a construction method for the application of fluidized solidified soil, comprising the following steps: filling the fluidized solidified soil with optimal moisture content into a mold, compacting and molding, demolding, and curing.

[0028] Preferably, the simmering time is 10-12 hours. More preferably, the simmering time is 11-12 hours.

[0029] Compared with the prior art, this application has at least the following beneficial effects: 1. The fluidized solidified soil of this application includes slag and modified materials; wherein, the modified materials include main cementitious materials and activators. The main cementitious materials adopt a combination of "cement + fly ash + mineral powder + desulfurized gypsum" instead of traditional single cement. Through the synergistic effect of physical filling and chemical cementation, it makes up for the defects of single cement modification that rely only on cement hydration, have low bonding efficiency and high carbon emissions.

[0030] 2. This application reduces the pollution caused by the stockpiling of solid waste by effectively utilizing solid waste such as fly ash, mineral powder, and desulfurization gypsum.

[0031] 3. The preparation method of the fluidized solidified soil in this application involves pretreatment of slag and soil, mixing of modified materials, and composite stirring. This results in a fluidized solidified soil with high stability and high compressive strength. The unconfined compressive strength of the cylindrical specimens prepared by this method reaches 11.2 MPa after 56 days of curing. After 6 days of curing, the water stability coefficient after soaking in water for 1 day is as high as 95.41% or more, and the CBR value is >100%. Detailed Implementation

[0032] The following detailed description of the contents of this application is provided through specific embodiments, comparative examples, and tables, but is not limited to all the arguments and data.

[0033] The raw material components of the fluidized solidified soil include: construction waste soil from Yunfu City, Guangdong Province; P.O42.5 ordinary Portland cement; Class II fly ash; and mineral powder with a specific surface area ≥420 m². 2 / kg of slag powder. The activator is liquid sodium silicate with a modulus of 2.8 and a Baume degree of 39Be'. The desulfurized gypsum is an industrial by-product.

[0034] It is particularly important to emphasize that, unless otherwise specified, the raw materials, reagents or devices used in this application can be obtained from conventional commercial sources.

[0035] A type of fluidized solidified soil is prepared through the following steps: S1: Pretreatment of slag: After crushing the original slag and removing impurities with a particle size >2mm through a 10-mesh sieve, take 90-100kg of the sieved slag and add water to adjust the fluidity to 190-205mm to obtain the base mud. Regarding step S1, in some specific implementation schemes, the weight of the slag after screening can be 90kg, 92kg, 95kg, 98kg or 100kg, and the flowability can be 190mm, 195mm, 200mm or 205mm.

[0036] S2: Modified material mixing: Mix 0.1-8 kg of cement, 20-30 kg of fly ash, 38-45 kg of mineral powder and 10-20 kg of desulfurized gypsum, dry mix for 2-3 minutes, then add 7.3-11.5 kg of activator and stir for 3-5 minutes to obtain the modified material.

[0037] Regarding step S2, in some specific implementations, the weight of cement can be 0.1kg, 1kg, 3kg, 4kg, 6kg or 8kg, the weight of fly ash can be 20kg, 23kg, 27kg or 30kg, the weight of mineral powder can be 38kg, 40kg, 43kg or 45kg, the weight of desulfurized gypsum can be 10kg, 14kg, 16kg, 18kg or 20kg, the dry mixing time can be 2min, 2.5 or 3min, the weight of activator can be 7.3kg, 8kg, 9.5kg, 10kg or 11.5kg, and the mixing time can be 3min, 4min or 5min.

[0038] S3: Composite mixing: Add 10-15 kg of modified material to the base mud and mix for 5-8 minutes to obtain fluidized solidified soil.

[0039] Regarding step S3, in some specific implementations, the weight of the modified material can be 10 kg, 12 kg, 14 kg or 15 kg, and the stirring time can be 5 min, 6 min, 7 min or 8 min.

[0040] Example of modified material preparation: Preparation Example 1: The preparation method of a modified material has the following steps: Mix 0.5 kg of cement, 22 kg of fly ash, 40 kg of mineral powder and 12 kg of desulfurized gypsum, dry mix for 2 minutes, then add 8 kg of activator and stir for 4 minutes to obtain the modified material.

[0041] Preparation Example 2: The preparation method of a modified material has the following steps: Mix 4 kg of cement, 26 kg of fly ash, 43 kg of mineral powder and 15 kg of desulfurized gypsum, dry mix for 3 minutes, then add 9 kg of activator and stir for 5 minutes to obtain the modified material.

[0042] Preparation Example 3: The preparation method of a modified material has the following steps: Mix 6 kg of cement, 28 kg of fly ash, 43 kg of mineral powder and 18 kg of desulfurized gypsum, dry mix for 3 minutes, then add 11 kg of activator and stir for 5 minutes to obtain the modified material.

[0043] Comparative examples of the preparation of modified materials: Preparation of Comparative Example 1: The preparation method of a modified material has the following steps: Mix 0.5 kg of cement, 30 kg of fly ash, and 44 kg of mineral powder, dry mix for 2 minutes, then add 8 kg of activator and stir for 4 minutes to obtain the modified material.

[0044] Preparation of Comparative Example 2: The preparation method of a modified material has the following steps: Mix 0.5 kg of cement, 42 kg of fly ash and 32 kg of desulfurized gypsum, dry mix for 2 minutes, then add 8 kg of activator and stir for 4 minutes to obtain the modified material.

[0045] Preparation of Comparative Example 3: The preparation method of a modified material has the following steps: Mix 0.5 kg of cement, 22 kg of fly ash, 40 kg of mineral powder and 25 kg of desulfurized gypsum, dry mix for 2 minutes, then add 8 kg of activator and stir for 4 minutes to obtain the modified material.

[0046] The mass fractions and process parameters of the raw material components of the fluidized solidified soil in the following examples and comparative examples correspond to Tables 1 and 2, respectively.

[0047] Table 1. Weight proportions and process parameters of the raw material components for fluidized solidified soil in Examples 1-7 Table 2 shows the weight proportions and process parameters of the raw material components for comparative examples 1-3 of fluidized solidified soil. Example 1: A type of fluidized solidified soil is prepared through the following steps: S1: Pre-treatment of slag: After crushing the original slag and removing impurities with a particle size >2mm through a 10-mesh sieve, take 95kg of the sieved slag and add water to adjust the fluidity to 190mm to obtain the base mud. S2: Mixing of modified materials: Add 10 kg of the modified material from Preparation Example 1 to the base mud and stir for 6 min to obtain fluidized solidified soil.

[0048] Example 2: A fluidized solidified soil is prepared in the same way as in Example 1, except that the types and amounts of raw materials and process parameters are the same as those in Example 2.

[0049] Example 3: A fluidized solidified soil is prepared in the same way as in Example 1, except that the types and amounts of raw materials and process parameters are the same as those in Example 3.

[0050] Example 4: A fluidized solidified soil is prepared in the same way as in Example 1, except that the types, amounts and process parameters of each raw material are in accordance with the parameters in Example 4.

[0051] Example 5: A fluidized solidified soil is prepared in the same way as in Example 1, except that the types and amounts of raw materials and process parameters are the same as those in Example 5.

[0052] Example 6: A fluidized solidified soil is prepared in the same way as in Example 1, except that the types, amounts and process parameters of each raw material are in accordance with the parameters in Example 6.

[0053] Example 7: A fluidized solidified soil is prepared in the same way as in Example 1, except that the types and amounts of raw materials and process parameters are the same as those in Example 7.

[0054] Comparative Example 1: A fluidized solidified soil is prepared in the same way as in Example 1, except that the types, amounts and process parameters of each raw material are the same as those in Comparative Example 1.

[0055] Comparative Example 2: A fluidized solidified soil is prepared in the same way as in Example 1, except that the types, amounts and process parameters of each raw material are in accordance with the parameters of Comparative Example 2.

[0056] Comparative Example 3: A fluidized solidified soil is prepared in the same way as in Example 1, except that the types and amounts of raw materials and process parameters are the same as those in Comparative Example 3.

[0057] Material performance testing: The fluidized solidified soils obtained in Examples 1-7 and Comparative Examples 1-3 were soaked at an optimal moisture content of 16.3% for 12 hours, poured into molds, compacted to a standard compaction degree of 100%, and demolded to obtain cylindrical specimens with a diameter of 50 mm and a height of 50 mm, which were used for unconfined compressive strength and water stability tests.

[0058] The fluidized solidified soils obtained in Examples 1-7 and Comparative Examples 1-3 were soaked at an optimum moisture content of 16.3% for 12 hours, poured into molds, compacted to a standard compaction degree of 100%, and demolded to obtain cylindrical specimens with a diameter of 152 mm and a height of 127 mm, which were used for CBR tests (carrying ratio tests).

[0059] 1. Unconfined compressive strength: Tested according to the "Test Procedure for Inorganic Binder Stabilized Materials in Highway Engineering" (JTG 3441-2024), with curing ages of 3d, 7d, 28d, and 56d.

[0060] 2. Water stability test: Two sets of specimens with the same mix ratio were used under standard curing conditions. The first set was cured for 6 days, then soaked in water for 1 day before testing. The second set was cured for 7 days and tested immediately. The measured data were compared, and the percentage of strength obtained was the water stability coefficient K. W The calculation is shown in the formula: Wherein, Kw is the water stability coefficient, %; R P -Unconfined compressive strength of specimens after 6 days of curing and 1 day of immersion in water; R C - Unconfined compressive strength of specimens that have not been immersed in water after 7 days of curing.

[0061] 3. CBR Test: A rigid indenter with a diameter of 152 mm is used to press into a cylindrical specimen with a diameter of 152 mm and a height of 127 mm at a uniform speed of 1 mm / min. The total pressure is measured at indentation depths of 2.5 mm and 5.0 mm respectively. The ratio of this pressure to the standard pressure of the "large particle size standard material" at the same depth (53.0 kN at 2.5 mm and 80.0 kN at 5.0 mm) is the CBR value (expressed as a percentage). The CBR value at a depth of 2.5 mm is preferred. If the CBR value at a depth of 5.0 mm is greater than that at a depth of 2.5 mm, the test must be repeated. If the result is still the same, the CBR value at a depth of 5.0 mm shall prevail.

[0062] The test properties of the cylindrical specimens prepared from the fluidized solidified soil of Examples 1-7 and Comparative Examples 1-3 are shown in Table 3 below: Table 3 shows the test results of various properties of the cylindrical specimens prepared from the fluidized solidified soils of Examples 1-7 and Comparative Examples 1-3. The fluidized solidified soils in Examples 1-7 include slag and modified materials. The modified materials include a main cementitious material and an activator. The main cementitious material is a combination of cement, fly ash, mineral powder, and desulfurized gypsum, rather than traditional single cement. Through the synergistic effect of physical filling and chemical cementation, it overcomes the shortcomings of single cement modification, which relies solely on cement hydration, has low bonding efficiency, and high carbon emissions. Through the steps of slag pretreatment, modified material mixing, and composite stirring, the resulting fluidized solidified soil has high stability and high compressive strength. The unconfined compressive strength of the cylindrical specimens obtained after curing for 56 days reached 11.2 MPa. After curing for 6 days and soaking in water for 1 day, the water stability coefficient was as high as 95.41% or more, and the CBR value was >100%.

[0063] Compared with Example 1, the modified material in Comparative Example 1 was prepared using the same raw materials, dosages, and process conditions as Example 1. The results showed that the unconfined compressive strength of the cylindrical specimens prepared from the fluidized solidified soil of Comparative Example 1 after curing for 3, 7, 28, and 56 days, as well as the water stability coefficient and CBR value after soaking in water for 1 day after 6 days of curing, were all lower than those of Example 1. This may be because the modified material in Comparative Example 1 did not contain desulfurized gypsum, which affected the effective filling degree between the slag particles in the base mud, thus reducing its overall density and strength.

[0064] Compared with Example 1, the modified material in Comparative Example 2 was prepared using the same raw materials, dosages, and process conditions as in Example 1. The results showed that the unconfined compressive strength of the cylindrical specimens prepared from the fluidized solidified soil in Comparative Example 2 after curing for 3, 7, 28, and 56 days, as well as the water stability coefficient and CBR value after soaking in water for 1 day after 6 days of curing, were significantly lower than those in Example 1, and were generally smaller than the corresponding values ​​in Comparative Example 1. This may be because the modified material in Comparative Example 2 was not prepared with mineral powder, which affected the degree to which the modified material participated in the hydration reaction. The stability and compressive strength of the cylindrical specimens prepared from the fluidized solidified soil were significantly reduced.

[0065] Compared with Example 1, the modified material in Comparative Example 3 was prepared using the same material as in Example 1. The other raw materials, dosages, and process conditions were the same. The results showed that the unconfined compressive strength of the cylindrical specimens made from the fluidized solidified soil in Comparative Example 3 after curing for 3 days, 7 days, 28 days, and 56 days, as well as the water stability coefficient and CBR value after soaking in water for 1 day after curing for 6 days, were not significantly better than those in Example 1. This indicates that excessive desulfurized gypsum did not significantly help improve the stability and compressive strength of the cylindrical specimens made from the fluidized solidified soil.

[0066] Obviously, the above embodiments of this application are merely examples for clearly illustrating this application, and are not intended to limit the implementation of this application. For those skilled in the art, other variations or modifications can be made based on the above description. Any obvious variations or modifications derived from the technical solutions of this application are still within the protection scope of this application.

Claims

1. A fluidized solidified soil, characterized in that, It includes slag and modified materials; the modified materials include main cementitious materials and activators; The slag is a low liquid limit silt with an optimum moisture content of 16.3% and a maximum dry density of 1.742 g / cm³. The main cementing material includes cement, fly ash, mineral powder and desulfurized gypsum; The activator is selected from at least one of sodium silicate, calcium oxide, and sodium carbonate.

2. The fluidized solidified soil according to claim 1, characterized in that, The cement is P.O42.5 ordinary Portland cement; And / or, the fly ash is Class II fly ash.

3. The fluidized solidified soil according to claim 1, characterized in that, The mineral powder is slag powder with a specific surface area ≥ 420 m² / kg; And / or, the desulfurized gypsum is an industrial by-product of desulfurization.

4. The fluidized solidified soil according to claim 1, characterized in that, The activator is sodium silicate, which is liquid sodium silicate with a modulus of 2.8 to 3.2 and a Baume degree of 38 to 40 Be'.

5. The fluidized solidified soil according to claim 1, characterized in that, The modified material comprises the following raw material components in parts by weight: Cement 0.1~8 parts; 20-30 parts fly ash; 38-45 parts mineral powder; 10-20 parts of desulfurized gypsum; 7.3 to 11.5 parts of activator.

6. The fluidized solidified soil according to any one of claims 1 to 5, characterized in that, The weight ratio of the slag to the modified material is (90~100):(10~15).

7. A method for preparing fluidized solidified soil as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1: Pre-treatment of slag: Crush and sieve the original slag, take the sieved slag, add water to adjust the fluidity, and obtain the base mud; S2: Modified material mixing: Mix the main cementitious material, dry mix, then add the activator, stir, and obtain the modified material; S3: Composite mixing: Add the modified material to the base mud and mix to obtain fluidized solidified soil.

8. The method for preparing fluidized solidified soil according to claim 7, characterized in that, In step S1, the flowability is adjusted to 190~205mm; In step S2, the dry mixing time is 2-3 minutes, and after adding the activator, the stirring time is 3-5 minutes.

9. The method for preparing fluidized solidified soil according to claim 7, characterized in that, In step S3, the stirring time is 5-8 minutes.

10. A method for applying and constructing fluidized solidified soil as described in any one of claims 1 to 6 or fluidized solidified soil prepared by the preparation method as described in any one of claims 7 to 9, characterized in that, Includes the following steps: The fluidized solidified soil is prepared with the optimal moisture content, poured into a mold, compacted, demolded, and cured.

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