High-humidity soft soil self-reinforced soil body based on carbonized steel slag tailings and preparation method

Abstract

The invention provides a high-humidity soft soil self-reinforced soil body based on carbonized steel slag tailings and a preparation method, and belongs to the field of steel solid waste utilization. The high-humidity soft soil self-reinforced soil body is prepared from the following raw materials in parts by mass: 200 to 300 parts of carbonized steel slag tailings, 150 to 300 parts of a multi-component inorganic cementing material and 1400 to 1600 parts of high-humidity soft soil. The raw material composition of the high-humidity soft soil self-reinforced soil body is reasonably designed, and carbonized steel slag tailings are embedded in the soil body, so that on one hand, a supporting effect is achieved; and on the other hand, micro-expansion of the particles can automatically repair micro gaps of the soil body within a certain range, so that the bearing performance of the soil body is always kept stable. Meanwhile, the inorganic cementing material has the soil-friendly cementing characteristic and can be well combined with tiny soil particles, the inorganic cementing material is a foundation for forming a complete semi-rigid soil body, and bulk resource utilization of the steel slag tailings in road engineering is achieved. Therefore, the utilization rate of the carbonized steel slag tailings is improved.

Description

Technical Field

[0001] The present application relates to the technical field of utilization of steel solid waste, and in particular to a high-humidity soft soil self-reinforced soil body based on carbonized steel slag tailings and a preparation method thereof. Background Art

[0002] At present, steel slag tailings after the recovery of metallic iron from converter slag are the largest type of industrial solid waste in steel enterprises. The way to realize the large-scale utilization of steel slag tailings is mainly through cross-industry and large-scale implementation, such as: construction and building materials, roads, marine engineering, mine filling, etc., but the constraints of key issues such as applicable standards and industry recognition have made it difficult to widely realize the large-scale utilization of steel slag tailings. It can only be stored in large-scale dedicated yards within the factory area. The pressure faced by steel enterprises is very great, and normal production is seriously affected. Therefore, how to improve the utilization rate of carbonized steel slag tailings is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The present application provides a high-wet soft soil self-reinforced soil body based on carbonized steel slag tailings and a preparation method thereof, in order to solve the following technical problem: how to improve the utilization rate of carbonized steel slag tailings.

[0004] In the first aspect, the present application provides a high-moisture soft soil self-reinforced soil body based on carbonized steel slag tailings. Calculated by weight, the high-moisture soft soil self-reinforced soil body includes the following raw materials: 200 to 300 parts of carbonized steel slag tailings, 150 to 300 parts of multi-component inorganic binder, and 1400 to 1600 parts of high-moisture soft soil.

[0005] Optionally, the moisture content of the high-humidity soft soil is ≥12%.

[0006] Optionally, the high-humidity soft soil includes one or more of clay, sand and ordinary soil.

[0007] Optionally, the multi-component inorganic binder includes the following components, measured in parts by mass: 65 to 75 parts of steel slag composite powder, 5 to 12 parts of semi-dry desulfurization ash, and 15 to 25 parts of inorganic active agent.

[0008] Optionally, the steel slag composite powder includes the following components, measured in parts by mass: 35 to 45 parts of first-grade steel slag powder and 55 to 65 parts of 95-grade slag powder.

[0009] Optionally, the inorganic active agent includes cement clinker powder, and the specific surface area of ​​the cement clinker powder is ≥350m 2 / kg.

[0010] Optionally, the particle size of the carburized steel slag tailings is less than 5 mm, and the carburized steel slag tailings include the following chemical components by mass fraction: TFe: 18% to 22%, FeO: 12.17%, CaO: 40% to 50%, SiO2: 13.5% to 15%, Al2O3: 1.9% to 2.5%, Fe2O3: 14.9%, MgO: 2% to 6%, Cl: 0.02%, and fCaO: 2% to 4%.

[0011] Optionally, the compressive strength of the test block of the high-humidity soft soil self-reinforced soil body at 7 days of age is ≥1.5MPa.

[0012] In a second aspect, the present application provides a method for preparing a highly moist soft soil self-reinforced soil body as described in any one of the embodiments of the first aspect, the method comprising:

[0013] The carbonized steel slag tailings, the multi-component inorganic binder and the high-humidity soft soil are mixed according to the set mass proportions to obtain a mixture;

[0014] The mixture is spread, compacted in layers and cured in sequence to obtain a highly moist soft soil self-reinforced soil body.

[0015] Optionally, the paving thickness is 500 mm to 800 mm, and the compaction degree of the layered compaction is greater than 90%.

[0016] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0017] The present application provides a self-reinforced soil body of high-humidity soft soil based on carbonized steel slag tailings. The self-reinforced soil body of high-humidity soft soil includes the following raw materials by weight: 200 to 300 parts of carbonized steel slag tailings, 150 to 300 parts of multi-component inorganic binder, and 1400 to 1600 parts of high-humidity soft soil. The raw material composition of the self-reinforced soil body of high-humidity soft soil is reasonably designed. The carbonized steel slag tailings particles are embedded in the soil body, which plays a supporting role on the one hand; on the other hand, the micro-expansion of the particles can automatically repair the tiny gaps in the soil body within a certain range, so that the bearing capacity of the soil body remains stable. At the same time, the inorganic binder has a soil-loving bonding property and can combine well with tiny soil particles, which is the basis for forming a complete semi-rigid soil body. For the first time, the carbonized steel slag tailings are mixed into high-humidity soft soil to replace "mountain skin stone" to enhance and maintain the long-term bearing capacity of the soil body, and realize the bulk resource utilization of steel slag tailings in road engineering. Thereby improving the utilization rate of carbonized steel slag tailings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 A flow chart of a method for preparing a highly moist soft soil self-reinforced soil body provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a method for preparing a highly moist soft soil self-reinforced soil body provided in an embodiment of the present application;

[0022] Figure 3 A particle size distribution diagram of the carbonized steel slag tailings provided in the embodiment of the present application;

[0023] Figure 4 A single test block diagram of a highly moist soft soil self-reinforced soil body provided in an embodiment of the present application;

[0024] Figure 5 This is a single test block diagram of the highly moist soft soil self-reinforced soil provided in Comparative Example 1 of the present application, which has been cured for more than 56 days. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0026] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0027] In addition, in the description of the specification of the present application, the terms "including", "comprising", etc. mean "including but not limited to". In this article, relational terms such as "first" and "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A and B can be singular or plural. In this article, "at least one" means one or more, and "plurality" means two or more. "At least one", "the following at least one item (items)" or similar expressions refer to any combination of these items, including any combination of single items (items) or plural items (items). For example, "at least one of a, b, or c", or "at least one of a, b, and c", can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or plural, respectively.

[0028] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0029] The technical principle of steel slag carbon fixation is mainly to use the calcium and magnesium elements in steel slag to react with carbon dioxide in industrial waste gas to generate calcium carbonate and magnesium to seal carbon dioxide in industrial waste gas. There are a lot of alkaline oxides in steel slag tailings, which provide material conditions for fixing carbon dioxide. However, the application of steel slag carbon fixation technology still needs to solve the problem of resource utilization of steel slag after carbon fixation.

[0030] Highly moist soft soil has high compressibility, low shear strength and bearing capacity. In order to meet the bearing capacity requirements of underground soil layers for road projects or construction projects in corresponding soil areas, it is necessary to replace the highly moist soft soil with "mountain skin stone". However, in high water level areas, the soil layer replaced with "mountain skin stone" has poor water stability and a short service life. What is more important is that large-scale mining of "mountain skin stone" has a great impact on the ecological environment, is subject to policy restrictions, and requires higher transportation costs.

[0031] The use of carbonized steel tailings and multi-component inorganic binders to form semi-rigid soil in high-humidity soft soil areas and enhance the bearing capacity of the soil layer to replace "mountain skin stone" is a large-scale, green and ecological way to utilize steel slag tailings with less industry constraints.

[0032] In order to solve the above-mentioned technical problems, the overall idea of ​​the present application is as follows: The present application provides a high-moisture soft soil self-reinforced soil body based on carbonized steel slag tailings. Calculated by mass, the high-moisture soft soil self-reinforced soil body includes the following raw materials: 200 to 300 parts of carbonized steel slag tailings, 150 to 300 parts of multi-component inorganic binder, and 1400 to 1600 parts of high-moisture soft soil.

[0033] The carbonized steel slag tailing particles in the embodiment of the present application are embedded in the soil, which plays a supporting role on the one hand; on the other hand, the micro-expansion of the particles can automatically repair the tiny gaps in the soil within a certain range, so that the bearing capacity of the soil remains stable. The bulk resource utilization of carbonized steel slag tailings is realized, and the micro-expansion characteristics of carbonized steel slag tailing particles maintain the stability of the bearing capacity of the soil, achieving the effect of "replacing stone with soil". Exemplarily, the carbonized steel slag tailings can be 200 parts, 220 parts, 240 parts, 260 parts, 280 parts, 300 parts, etc., the multi-component inorganic binder can be 150 parts, 180 parts, 200 parts, 220 parts, 240 parts, 280 parts, 300 parts, etc., and the high-humidity soft soil can be 1400 parts, 1420 parts, 1450 parts, 1500 parts, 1550 parts, 1600 parts, etc.

[0034] In some embodiments, the moisture content of the high-humidity soft soil is ≥ 12%.

[0035] In some embodiments, the high-humidity soft soil includes one or more of clay, sand and ordinary soil.

[0036] In the above embodiment, the moisture content of the high-humidity soft soil is controlled to ensure that the compressive strength of the high-humidity soft soil self-reinforced soil body meets the design requirements. For example, the moisture content of the high-humidity soft soil can be 12%, 15%, 20%, 25%, 30%, etc.

[0037] In some embodiments, the multi-component inorganic binder includes the following components, measured by weight: 65 to 75 parts of steel slag composite powder, 5 to 12 parts of semi-dry desulfurization ash, and 15 to 25 parts of inorganic active agent.

[0038] It should be noted that the semi-dry desulfurization ash comes from the sintering machine flue gas desulfurization process. In terms of mass fraction, the main chemical components of the semi-dry desulfurization ash are Ca(OH)2: 20%~55%, CaCO3: 8%~15%, CaSO3 0.5H2O: 20%~40%, Ca S O4 2H2O: 10%~20%, CaCl2 2H2O: 2.5%~3.5%, fCaO: 4.5%, calcium phase totals 95%~100%.

[0039] In the above embodiment, the iron and steel slag composite powder has the property of soil affinity and can be well combined with tiny soil particles, which is the basis for forming a complete semi-rigid soil body. At the same time, the semi-dry desulfurization ash and the inorganic active agent jointly stimulate the hydration activity of the iron and steel slag composite powder, and promote the formation of the gelled products calcium vanadium and CSH gel. Thereby ensuring that the compressive strength of the high-wet soft soil self-reinforced soil body meets the design requirements. Exemplarily, the iron and steel slag composite powder can be 65 parts, 67 parts, 69 parts, 70 parts, 72 parts, 74 parts, 75 parts, etc., the semi-dry desulfurization ash can be 5 parts, 7 parts, 8 parts, 9 parts, 10 parts, 12 parts, etc., and the inorganic active agent can be 15 parts, 17 parts, 19 parts, 20 parts, 22 parts, 24 parts, 25 parts, etc.

[0040] In some embodiments, the steel slag composite powder includes the following components, measured by weight: 35 to 45 parts of first-grade steel slag powder and 55 to 65 parts of 95-grade slag powder.

[0041] It should be noted that the activity index of steel slag powder is level 1 (Steel Slag Powder for Cement and Concrete GBGB / T20491-2017), and the activity index of slag powder is level 95 (Granulated Blast Furnace Slag Powder for Cement, Mortar and Concrete GB / T 18046-2017).

[0042] In the above embodiment, controlling the mass fractions of the first-grade steel slag powder and the 95-grade slag powder is conducive to exerting the synergistic effect of the steel slag powder of alkaline minerals and the slag powder of acidic minerals. Exemplarily, the first-grade steel slag powder can be 35 parts, 36 parts, 38 parts, 39 parts, 40 parts, 42 parts, 44 parts, 45 parts, etc., and the 95-grade slag powder can be 55 parts, 57 parts, 59 parts, 60 parts, 62 parts, 64 parts, 65 parts, etc.

[0043] In some embodiments, the steel slag composite powder includes the following components, measured by mass: 40 parts of first-grade steel slag powder and 60 parts of 95-grade slag powder.

[0044] In the above embodiment, the gelling activity of steel slag micropowder reaches the best synergistic effect when and only when the ratio of steel slag micropowder to slag micropowder is 40:60. This is because the alkaline substances generated by the hydration of steel slag micropowder promote the hydration of slag micropowder, and the complementary properties between different mineral admixtures. Under reasonable component ratio conditions, the composite mineral admixture will exhibit better performance than a single mineral admixture.

[0045] In some embodiments, the inorganic active agent includes cement clinker powder, and the specific surface area of ​​the cement clinker powder is ≥350m 2 / kg.

[0046] In the above embodiment, the specific surface area of ​​the cement clinker powder is controlled to ensure the efficiency of the cement clinker powder in stimulating the hydration activity of the steel slag composite powder. For example, the specific surface area of ​​the cement clinker powder can be 350 m 2 / kg, 360m 2 / kg, 370m 2 / kg, 380m 2 / kg、400m 2 / kg, 450m 2 / kg, etc.

[0047] In some embodiments, the particle size of the carburized steel slag tailings is less than 5 mm, and the carburized steel slag tailings include the following chemical components by mass fraction: TFe: 18% to 22%, FeO: 12.17%, CaO: 40% to 50%, SiO2: 13.5% to 15%, Al2O3: 1.9% to 2.5%, Fe2O3: 14.9%, MgO: 2% to 6%, Cl: 0.02%, and fCaO: 2% to 4%.

[0048] In the above embodiment, the carbonized steel slag tailings are the part of converter steel slag that has been crushed and magnetically separated to recover ferrite, especially the part with a particle size of less than 5 mm after carbonization. The carbonized steel slag tailings added to the soil can act as aggregate on the one hand, which is beneficial to improve the compressive strength of the soil; on the other hand, it can play a micro-expansion role to stabilize the later bearing performance of the soil.

[0049] In some embodiments, the compressive strength of a test block of the high-wet soft soil self-reinforced soil body at 7 days of age is ≥1.5 MPa.

[0050] This application is based on the strong correlation between the moisture content of wet soft soil, the ratio of inorganic adhesive and the strength of the soil, and the influence of the micro-expansion of carbonized steel slag tailings particles on the stability of the soil structure, so as to ensure that the compressive strength of the high wet soft soil self-reinforced soil meets the unconfined compressive strength standard of the highway pavement base. For example, the compressive strength of the test block of the 7-day-old high wet soft soil self-reinforced soil can be 1.5MPa, 1.7MPa, 1.8MPa, 1.9MPa, 2.0MPa, 2.1MPa, 2.2MPa, 2.5MPa, etc.

[0051] Figure 1 A schematic diagram of a process for preparing a highly moist soft soil self-reinforced soil body provided in an embodiment of the present application; Figure 2 A schematic diagram of a method for preparing a highly moist soft soil self-reinforced soil body provided in an embodiment of the present application.

[0052] See also Figure 1 and Figure 2 The present application provides a method for preparing a highly moist soft soil self-reinforced soil body as described in any one of the embodiments of the first aspect, the method comprising:

[0053] S1, mixing carbonized steel slag tailings, multi-component inorganic binder and high-humidity soft soil according to set mass parts to obtain a mixture;

[0054] S2. The mixture is sequentially spread, layered compacted and cured to obtain a highly moist soft soil self-reinforced soil body.

[0055] It should be noted that at the construction site, the highly moist soft soil is first quantitatively and continuously transported to the mobile twin-shaft mixer through twin-shaft conveying equipment. At the same time, carbonized steel slag tailings and multi-component inorganic binder are added in proportion and mixed together. The mixed material is spread and leveled at the construction site, tamped and compacted to form a semi-rigid whole soil mass with a compaction degree of not less than 90% and a certain initial strength. After 7 days of covering and watering maintenance, the soil bearing strength finally reaches the design requirements.

[0056] In some embodiments, the paving thickness is 500 mm to 800 mm, and the compaction degree of the layered compaction is greater than 90%.

[0057] In the above embodiment, the paving thickness and the compaction degree of the layered compaction are controlled to ensure that the compressive strength of the high-wet soft soil self-reinforced soil body meets the design requirements. For example, the paving thickness can be 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, 800mm, etc., and the compaction degree of the layered compaction can be 91%, 92%, 93%, 94%, 95%, etc.

[0058] The product prepared by the method for preparing high-moisture soft soil self-reinforced soil is the above-mentioned high-moisture soft soil self-reinforced soil. The chemical composition and microstructure of the high-moisture soft soil self-reinforced soil prepared by the method for preparing high-moisture soft soil self-reinforced soil can refer to the above-mentioned embodiment. Since the method for preparing high-moisture soft soil self-reinforced soil adopts part or all of the technical solutions of the high-moisture soft soil self-reinforced soil embodiment, it at least has all the beneficial effects brought by the technical solutions of the high-moisture soft soil self-reinforced soil embodiment, which will not be repeated here one by one.

[0059] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to industry standards. If there is no corresponding industry standard, then the conditions recommended by the manufacturer are followed.

[0060] The following is a detailed description of a highly moist soft soil self-reinforced soil body of the present application in combination with embodiments, comparative examples and experimental data. The present application provides a method for preparing a highly moist soft soil self-reinforced soil body, comprising the following steps:

[0061] S11, carbonized steel slag tailings, multi-component inorganic binder and high-humidity soft soil are mixed according to the set mass proportions to obtain a mixture; wherein the multi-component inorganic binder is composed of 70 parts of steel slag composite micropowder, 10 parts of semi-dry desulfurization ash and 20 parts of cement clinker powder, wherein the mass ratio of first-grade steel slag micropowder to 95 slag micropowder of the steel slag composite micropowder is 40:60. High-humidity soft soil is ordinary soil, Figure 3 The particle size distribution diagram of the carbonized steel slag tailings provided in the embodiment of the present application is shown in FIG. Figure 3 As shown by Figure 3 It can be seen that the modulus of carbonized steel slag tailings is 2.52, which is medium sand;

[0062] S21. The mixture is spread and compacted in layers in sequence, and then prepared into test blocks according to the "Standard Test Procedure for Stabilized Materials of Inorganic Binders for Highway Engineering" JTG E51-2009. The compressive strength at the age of 7 days is measured after standard curing and curing. The raw material composition of the high-wet soft soil self-reinforced soil body in the embodiment and the comparative example and the compressive strength at the age of 7 days are shown in Tables 1 and 2.

[0063] Table 1 Raw material composition of high-humidity soft soil self-reinforced soil body and compressive strength at 7 days of age

[0064]

[0065]

[0066] As can be seen from Table 1, the compressive strength of the 7-day-old high-wet soft soil self-reinforced soil meets the "Technical Specifications for Highway Pavement Base Construction" JTGT F20-2015, which states that industrial waste slag inorganic binder stabilized materials should meet the 7d unconfined compressive strength standard of lime fly ash stabilized materials. Compared with the three different moisture content conditions, the compressive strength of the test blocks in the embodiment meets the standard requirements, and increases with the increase of the amount of inorganic binder and decreases with the increase of moisture content. The soil strength is strongly correlated with the moisture content of the wet soft soil and the ratio of the inorganic binder. At the same time, the single test blocks of the high-wet soft soil self-reinforced soil in the embodiment that have been cured for more than 56 days have no cracks and no stability problems.

[0067] Table 2 Raw material composition of high-humidity soft soil self-reinforced soil and compressive strength at 7 days of age

[0068]

[0069]

[0070] During the test, it was found that more than 450 parts of 5mm carbonized steel slag tailings were added to the 56-day retained sample. Figure 5As shown in the figure, some samples began to crack and even crack. The main reason is that under standard curing conditions, the free calcium oxide and magnesium oxide inside the steel slag tailing particles expand slightly. Although there is a certain proportion of tiny pores in the semi-rigid soil that can absorb the micro-expansion of carbonized steel slag tailings, when the addition amount is large, the superimposed micro-expansion cannot be absorbed by the formed soil and leads to cracking. Therefore, in order to prevent stability problems in the formed soil, the addition amount of steel slag tailings should not exceed 300 parts.

[0071] In addition, one or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0072] In the embodiment of the present invention, for the first time, carbonized steel slag tailings are mixed into high-humidity soft soil to replace "mountain stone" to enhance and maintain the long-term bearing capacity of the soil, realize the large-scale resource utilization of steel slag tailings in road engineering, open up a way to utilize carbonized steel slag tailings in large quantities, and effectively alleviate the solid waste storage pressure faced by steel companies. At the same time, it reduces the hardening cost of high-humidity soft soil areas, saves the mining volume of mountain stone, and protects the natural ecological environment.

[0073] In the embodiment of the present invention, cement clinker powder is used as an activator for the synergistic activity of steel slag composite powder.

[0074] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A highly moist soft soil self-reinforced soil body based on carbonized steel slag tailings, characterized in that: The high-moisture soft soil self-reinforced soil body comprises the following raw materials in parts by mass: 200 to 300 parts of carbonized steel slag tailings, 150 to 300 parts of multi-component inorganic binder, and 1400 to 1600 parts of high-moisture soft soil.

2. The high-humidity soft soil self-reinforced soil body according to claim 1, characterized in that: The moisture content of the high-humidity soft soil is ≥12%.

3. The high-humidity soft soil self-reinforced soil body according to claim 2, characterized in that: The high-humidity soft soil includes one or more of clay, sand and ordinary soil.

4. The high-humidity soft soil self-reinforced soil body according to claim 1, characterized in that: Calculated by weight, the multi-component inorganic binder includes the following components: 65 to 75 parts of steel slag composite powder, 5 to 12 parts of semi-dry desulfurization ash, and 15 to 25 parts of inorganic active agent.

5. The high-humidity soft soil self-reinforced soil body according to claim 4, characterized in that: The steel slag composite powder comprises the following components in parts by mass: 35 to 45 parts of first-grade steel slag powder and 55 to 65 parts of 95-grade slag powder.

6. The high-humidity soft soil self-reinforced soil body according to claim 4, characterized in that: The inorganic active agent includes cement clinker powder, and the specific surface area of ​​the cement clinker powder is ≥350m 2 / kg.

7. The high-humidity soft soil self-reinforced soil body according to claim 1, characterized in that: The particle size of the carburized steel slag tailings is less than 5 mm. Calculated by mass fraction, the carburized steel slag tailings include the following chemical components: TFe: 18% to 22%, FeO: 12.17%, CaO: 40% to 50%, SiO2: 13.5% to 15%, Al2O3: 1.9% to 2.5%, Fe2O3: 14.9%, MgO: 2% to 6%, Cl: 0.02%, and fCaO: 2% to 4%.

8. The high-humidity soft soil self-reinforced soil body according to claim 1, characterized in that: The compressive strength of the test block of the high-humidity soft soil self-reinforced soil body at 7 days of age is ≥1.5MPa.

9. A method for preparing a highly moist soft soil self-reinforced soil body as claimed in any one of claims 1 to 8, characterized in that: The method comprises: The carbonized steel slag tailings, the multi-component inorganic binder and the high-humidity soft soil are mixed according to the set mass proportions to obtain a mixture; The mixture is spread, compacted in layers and cured in sequence to obtain a highly moist soft soil self-reinforced soil body.

10. The method according to claim 9, characterized in that The paving thickness is 500 mm to 800 mm, and the compaction degree of the layered compaction is greater than 90%.

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