Environment-friendly performance-adjustable fluidized solidified soil solidifying agent and preparation method thereof

Abstract

This invention relates to the field of geotechnical engineering, and more particularly to a performance-adjustable environmentally friendly fluidized bed solidification agent and its preparation method. The performance-adjustable environmentally friendly fluidized bed solidification agent provided by this invention comprises, by weight, the following raw materials: 40-70 parts of active mineral component, 10-30 parts of performance-regulating component, 2-10 parts of anti-shrinkage component, 5-10 parts of micropore-filling component, and 2-5 parts of intercalating material component. This invention can achieve dynamic control of the performance of fluidized bed solidification filler according to engineering needs, alleviate or avoid the cracking problem of traditional fluidized bed solidification filler, avoid secondary pollution to the environment, significantly reduce material costs, and achieve high-value utilization of solid waste materials, resulting in significant economic and social benefits.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering technology, and in particular to an environmentally friendly fluidized solidified soil curing agent with adjustable performance and its preparation method. Background Technology

[0002] The information disclosed in the background section of this invention is intended only to enhance the understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Fluidized solidified soil is a novel geotechnical engineering material formed by incorporating a solidifying agent into the soil and mixing it with a large amount of water, resulting in high fluidity and self-compacting properties. However, the solidifying agents used in fluidized solidified soil technology currently face many problems in practical applications, hindering its further promotion and development.

[0004] 1. Existing technologies mostly use traditional silicate cement as the main curing material. Due to its hydration mechanism, a large amount of free water in the system dilutes the concentration of cementitious components, delaying the hydration process and resulting in slow strength development and a long hardening period. To achieve the early strength required for demolding or subsequent processes, the curing time is often extended, affecting the construction progress and making it difficult to adapt to scenarios with strict time requirements, such as rapid backfilling of foundation pits and emergency rescue.

[0005] 2. Cement-based fluidized solidified soil generally suffers from low strength. To improve strength, engineering projects often use methods that significantly increase the cement content. While this can improve mechanical properties to some extent, it also leads to a significant increase in material costs, weakening its economic advantage in competition with traditional backfill materials such as graded crushed stone and lime-soil, and even causing it to lose its cost competitiveness.

[0006] 3. Fluidized solidified soil is a fine-grained material system and uses a high water-cement ratio. During the setting and hardening process, due to hydration reactions and water evaporation, it is prone to significant drying shrinkage and chemical shrinkage. When shrinkage is constrained by internal and external factors, shrinkage cracks can easily form on the surface or inside the material, threatening its long-term durability and service performance.

[0007] 4. Different engineering scenarios have different requirements for the performance of fluidized solidified soil. For example, backfilling of pipe gallery trenches emphasizes early strength, high fluidity, and micro-expansion characteristics, while roadbed engineering focuses more on long-term strength, impermeability, and frost resistance. Traditional cement-based solidification systems, due to their relatively fixed hydration products and setting processes, make it difficult to achieve precise design and dynamic control of workability, mechanical properties, and durability, thus limiting their wider application.

[0008] 5. In recent years, alkaline-activated solidification materials made from industrial solid wastes such as slag, steel slag, and desulfurized gypsum have emerged. Although they can improve early reaction activity and shorten setting time, due to the complex composition of solid wastes, which often contain trace amounts of heavy metals, it is difficult to achieve stable solidification of harmful substances in fluid systems with a high water-cement ratio. This poses a potential risk of leaching toxicity and secondary environmental pollution.

[0009] Therefore, developing a new type of solidification system for fluidized solidified soil that can overcome the above-mentioned defects has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0010] In view of this, the present invention provides an environmentally friendly fluidized solidified soil curing agent with adjustable performance and its preparation method. The curing agent of the present invention, through component design and ratio adjustment, can achieve dynamic adjustment of the mechanical properties and setting time of the fluidized solidified soil; by adjusting the internal water loss rate through hydrophilic materials, it effectively compensates for shrinkage and inhibits cracking; simultaneously, through the regulation of intercalation materials, it achieves the adsorption and solidification of harmful substances, solving the problem of secondary pollution to the environment.

[0011] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0012] In a first aspect, the present invention provides an environmentally friendly fluidized solidified soil solidifier with adjustable performance. By weight, the raw materials include: 40-70 parts of active mineral components, 10-30 parts of performance regulating components, 2-10 parts of anti-shrinkage components, 5-10 parts of micropore filling components, and 2-5 parts of intercalation material components.

[0013] The active mineral component is at least one of the following: granulated blast furnace slag powder rich in active silica and alumina, converter steel slag powder, metakaolin, or volcanic ash.

[0014] The performance regulating components include two types: setting time regulating component A and strength regulating component B; the setting time regulating component A is at least one of dihydrate gypsum or hemihydrate gypsum; the strength regulating component B is at least one of P·O425 cement, cement clinker, or CaO.

[0015] The anti-shrinkage component includes at least one of starch acrylate polymer, expanded shale powder, pumice, or cross-linked sodium polyacrylate;

[0016] The micropore filling component is one or both of ultrafine fly ash or silica fume;

[0017] The intercalation material is composed of calcined dolomite rich in active MgO.

[0018] Furthermore, the specific surface area of ​​the active mineral component is 350 m². 2 / kg or more; the grade of the granulated blast furnace slag powder is not lower than S95 grade, and the performance of the converter steel slag powder can meet the requirements of GB / T 20491.

[0019] Furthermore, when the active mineral component is a mixture of granulated blast furnace slag powder, converter steel slag powder, metakaolin, and volcanic ash rich in active silica and alumina, the mass ratio is 0.5~1:0~0.4:0~0.2:0~0.1.

[0020] The active mineral components are rich in active silica and alumina. Under the influence of alkaline hydration products released during the dissolution and hydration of the performance-regulating components, the silicon-oxygen and aluminum oxide chemical bonds break, releasing various silicate and aluminate ion monomers. These monomers migrate and collide in the solution, rearranging themselves around the alkali metal ions to form a new, more stable three-dimensional network gel. As the newly formed gel continues to grow and intertwine, it fills the gaps between particles and binds unreacted solid particles together, causing the entire mixture to gradually lose its fluidity, develop strength, and eventually harden.

[0021] Furthermore, the mass ratio of condensation time regulating component A to intensity regulating component B is 0.2~0.5:0.4~1.

[0022] Furthermore, the dihydrate gypsum is gypsum dihydrate after precipitation (free water); the dihydrate gypsum is at least one of fluorogypsum, desulfurized gypsum, titanium gypsum, phosphogypsum, and limonite.

[0023] Furthermore, the hemihydrate gypsum is dihydrate gypsum after dehydration (binding water); the hemihydrate gypsum is at least one of fluorogypsum, desulfurized gypsum, titanium gypsum, phosphogypsum, and limonite, with a free water content of less than 1%.

[0024] Furthermore, when using a mixture of dihydrate gypsum and hemihydrate gypsum, the mass ratio of the two is 0.1~0.9:0.1~0.9.

[0025] Calcium sulfate in dihydrate and hemihydrate gypsum can act as a sulfate activator, reacting with calcium hydroxide produced by hydration in the strength-regulating component and the aluminum-containing phase in the active mineral component to generate ettringite crystals. The ettringite crystals coat the surface of the mineral particles, which can slow down the mineral hydration and solidification. Meanwhile, hemihydrate gypsum helps to accelerate the precipitation of hydration products crystals in cementitious materials, shorten the induction period, and thus accelerate the growth of the compressive strength of cementitious materials, playing an early strength role.

[0026] Furthermore, when the strength regulating component B is a mixture of P·O425 cement, cement clinker, and CaO, its mass ratio is 0.5~1:0.1~0.3:0~0.1.

[0027] During the hydration process of the strength-regulating component, calcium hydroxide is first produced, creating an alkaline environment in the solution. This alkaline activation effect on the active mineral components promotes the formation of hydration products and increases strength.

[0028] Furthermore, when the anti-shrinkage component is a mixture of starch acrylate polymer, expanded shale powder, pumice, and cross-linked sodium polyacrylate, the mass ratio of the four components is 0~1:0~1:0~0.3:0~0.1.

[0029] The anti-shrinkage component has interconnected pores or hydrophilic groups that can absorb and store a large amount of water. Then, during the hydration process of the active mineral component, this water is gradually released to continuously supply further hydration and alleviate the cracking problem of the fluidized solidified soil in the later stage.

[0030] Furthermore, the specific surface area of ​​the microporous filling component is 500 m². 2 / kg or more; when the micropore filling component is a mixture of ultrafine fly ash and silica fume, the mass ratio of the two is 0.1~0.9:0.1~0.9.

[0031] The addition of filling material can fill the micropores generated during the hydration reaction, improve the compactness of the material, thereby improving its mechanical properties and impermeability. It can also improve the workability of fluidized solidified soil and facilitate on-site pumping construction.

[0032] The intercalation material is composed of calcined dolomite rich in active MgO. The addition of active magnesium components to the active mineral component with a high content of active aluminum promotes the formation of a hydrotalcite-like phase. The outer surface of the hydrotalcite mineral phase has a diffuse double-layer structure, forming more anion vacancies and enabling efficient ion exchange with chloride ions. Simultaneously, the hydroxyl groups on the hydrotalcite surface coordinate with heavy metal cations, thereby adsorbing and solidifying Pb. 2+ Cu 2+ and Cr 3+ The role of heavy metal cations.

[0033] Furthermore, the fluidized solidified soil curing agent includes early-strength, retarded, high-strength, and ordinary fluidized solidified soil curing agents.

[0034] Furthermore, the early-strength fluidized solidified soil solidifier, by weight, comprises 40-70 parts of active mineral component, 10-30 parts of performance regulating component, 2-10 parts of anti-shrinkage component, 5-10 parts of micropore filling component, and 2-5 parts of intercalating material component; the active mineral component is at least one of granulated blast furnace slag powder, metakaolin, or volcanic ash rich in active silica and alumina; the performance regulating component includes two types: setting time regulating component A and strength regulating component B; the setting time regulating component A is hemihydrate gypsum; the strength regulating component B is cement clinker; the anti-shrinkage component includes at least one of starch acrylate polymer, expanded shale powder, pumice, or cross-linked sodium polyacrylate; the micropore filling component is one or both of ultrafine fly ash and silica fume; and the intercalating material component is calcined dolomite rich in active MgO.

[0035] Furthermore, the slow-setting fluidized solidified soil solidifier, by weight, comprises 40-70 parts of active mineral component, 10-30 parts of performance regulating component, 2-10 parts of anti-shrinkage component, 5-10 parts of micropore filling component, and 2-5 parts of intercalating material component; the active mineral component is at least one of granulated blast furnace slag powder, converter steel slag powder, metakaolin, or volcanic ash rich in active silica and alumina; the performance regulating component includes two types: setting time regulating component A and strength regulating component B; the setting time regulating component A is gypsum dihydrate; the strength regulating component B is at least one of P·O425 cement and CaO; the anti-shrinkage component includes at least one of starch acrylate polymer, expanded shale powder, pumice, or cross-linked sodium polyacrylate; the micropore filling component is one or both of ultrafine fly ash and silica fume; and the intercalating material component is calcined dolomite rich in active MgO.

[0036] Furthermore, the high-strength fluidized solidified soil solidifier, by weight, comprises 40-70 parts of active mineral component, 10-30 parts of performance regulating component, 2-10 parts of anti-shrinkage component, 5-10 parts of micropore filling component, and 2-5 parts of intercalating material component; the active mineral component is at least one of granulated blast furnace slag powder rich in active silica and alumina, metakaolin, or volcanic ash; the performance regulating component includes two types: setting time regulating component A and strength regulating component B; the setting time regulating component A is hemihydrate gypsum; the strength regulating component B is at least one of cement clinker or CaO; the anti-shrinkage component includes at least one of starch acrylate polymer, expanded shale powder, pumice, or cross-linked sodium polyacrylate; the micropore filling component is one or both of ultrafine fly ash and silica fume; and the intercalating material component is calcined dolomite rich in active MgO.

[0037] Further, the ordinary type of fluidized solidified soil solidifier, by weight, comprises 40-70 parts of active mineral component, 10-30 parts of performance regulating component, 2-10 parts of anti-shrinkage component, 5-10 parts of micropore filling component, and 2-5 parts of intercalating material component; the active mineral component is at least one of granulated blast furnace slag powder, converter steel slag powder, metakaolin, or volcanic ash rich in active silica and alumina; the performance regulating component includes two types: setting time regulating component A and strength regulating component B; the setting time regulating component A is a mixture of dihydrate gypsum and hemihydrate gypsum; the strength regulating component B is at least one of P·O425 cement, cement clinker, or CaO; the anti-shrinkage component includes at least one of starch acrylate polymer, expanded shale powder, pumice, or cross-linked sodium polyacrylate; the micropore filling component is ultrafine fly ash; and the intercalating material component is calcined dolomite rich in active MgO.

[0038] Secondly, the present invention provides a method for preparing the fluidized solidified soil curing agent described in the first aspect, wherein the method for preparing the ordinary, early-strength, and high-strength fluidized solidified soil curing agent includes the following steps:

[0039] (1) The condensation time regulating component A was subjected to precipitation treatment until the free water content was less than 1%, and then ground until the specific surface area was 300 m². 2 / kg or more;

[0040] (2) Dry and heat component A, which controls the condensation time after precipitation in step (1);

[0041] (3) Mix the setting time regulating component A after step (2) with the active mineral component, performance regulating component, anti-shrinkage component, micropore filling component and intercalation material component in proportion to obtain the curing agent.

[0042] Furthermore, in step (1), the precipitation treatment method is natural air drying or baking; the baking temperature is not lower than 60 ℃.

[0043] Furthermore, in step (2), the drying heating temperature is 140~160 ℃ and the time is 2~10 h.

[0044] Furthermore, in step (3), the mixing time is 4 to 10 minutes; the mixing uniformity is above 98%.

[0045] Furthermore, the preparation method of the retarded fluidized solidified soil solidifier includes the following steps:

[0046] (1) The condensation time regulating component A was subjected to precipitation treatment until the free water content was less than 1%, and then ground until the specific surface area was 300 m². 2 / kg or more;

[0047] (2) Mix the setting time regulating component A after step (1) with the active mineral component, performance regulating component, anti-shrinkage component, micropore filling component and intercalation material component in proportion to obtain the curing agent.

[0048] Furthermore, in step (1), the precipitation treatment method is natural air drying or baking; the baking temperature is not lower than 60 ℃.

[0049] Furthermore, in step (2), the mixing time is 4 to 10 minutes; the mixing uniformity is above 98%.

[0050] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0051] (1) The environmentally friendly fluidized solidified soil curing agent with adjustable performance provided by the present invention makes full use of the synergistic effect between the components. Through the optimized design between the components, the performance of the fluidized solidified soil curing agent is dynamically adjusted to meet the performance requirements of different projects for fluidized solidified soil, such as early strength type, slow setting type, high strength type and ordinary type, etc., and has a wider range of applications.

[0052] (2) The environmentally friendly fluidized solidified soil curing agent with adjustable performance provided by the present invention, through material system design, slows down the drying shrinkage caused by rapid hydration and water loss of fluidized solidified soil, effectively compensates for the tensile stress caused by chemical shrinkage and drying shrinkage during the hardening process of fluidized solidified soil, thereby significantly alleviating or even avoiding the cracking problem that is common in traditional fluidized solidified soil from a mechanism perspective, and improving the long-term stability and service life of the project.

[0053] (3) The performance adjustable environmentally friendly fluidized solidified soil solidifier provided by the present invention uses bulk industrial solid waste as the main material. The preparation method is simple, which alleviates the environmental pollution problem caused by the stockpiling of bulk solid waste, realizes the high-value comprehensive utilization of industrial solid waste, reduces the material cost of fluidized solidified soil, reduces the carbon emissions of cement-based fluidized solidified soil material system, conforms to the development direction of green building materials, and has significant economic advantages.

[0054] (4) The environmentally friendly fluidized solidified soil solidifier with adjustable performance provided by the present invention can effectively adsorb, encapsulate and stabilize harmful ions such as heavy metals that may be dissolved in industrial solid waste by introducing specific intercalation material components. This achieves effective solidification of harmful ions in the solidifier, ensures the environmental safety of the material throughout its entire life cycle, and avoids secondary pollution of the environment by traditional solid waste-based fluidized solidified soil solidifiers. Detailed Implementation

[0055] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0056] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0057] Example 1

[0058] An early-strength, environmentally friendly fluidized solidified soil curing agent, by weight, comprises: 60 parts of active mineral components, 30 parts of performance regulating components, 10 parts of anti-shrinkage components, 5 parts of micropore filling components, and 2 parts of intercalation material components.

[0059] The active mineral component is a mixture of S105 grade granulated blast furnace slag powder and metakaolin, with a mass ratio of 0.5:0.2. The performance regulating components include setting time regulating component A and strength regulating component B, with a mass ratio of 0.2:1. Setting time regulating component A is hemihydrate gypsum after drying fluorogypsum, and strength regulating component B is cement clinker. The anti-shrinkage component is a starch-acrylate polymer. The micropore-filling component is fly ash.

[0060] The preparation method of the early-strength environmentally friendly fluidized solidified soil solidifier in this embodiment includes the following steps:

[0061] (1) The free water content of the setting time control component A, i.e., fluorogypsum, is reduced to less than 1% by natural sun drying; it is then loaded into a vertical mill and ground until the specific surface area is 300 m². 2 / kg or more.

[0062] (2) The condensation time control component A after precipitation in step (1) is placed in a drying oven with a drying temperature of 150 °C and heated for 3 h to obtain hemihydrate gypsum with a hemihydrate calcium sulfate content of not less than 95%.

[0063] (3) The setting time regulating component A after step (2) is mixed with the active mineral component, performance regulating component B, anti-shrinkage component, micropore filling component and intercalation material component in a fiber mixer according to the proportion. The mixing time is 5 minutes and the mixing uniformity reaches more than 99.5% to obtain early strength environmentally friendly fluid solidified soil solidifier.

[0064] The early-strength environmentally friendly fluidized solidified soil solidifier and dry silt obtained in this embodiment were mixed at a mass ratio of 1:10 and a water-to-solid ratio (the ratio of water to the mass of solidifier and silt) of 0.35:1. Specimens with dimensions of 70.7 mm × 70.7 mm × 70.7 mm were prepared according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T 233-2011. After demolding for 1 day, the unconfined compressive strength at 1 day, 2 days, 3 days, 7 days, and 28 days was tested according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T 233-2011. At the same time, the leaching concentration of harmful substances was tested according to the "Integrated Wastewater Discharge Standard" GB 8978. Prismatic specimens with dimensions of 100 mm × 100 mm × 515 mm were prepared according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T 233-2011. The shrinkage rate at 3d, 7d, and 28d was tested according to the non-contact method in the "Standard for Test Methods of Long-Term Performance and Durability of Concrete" GB / T 50082-2024.

[0065] Example 2

[0066] A slow-setting, environmentally friendly fluidized solidified soil curing agent, by weight, comprises: 50 parts of active mineral component, 25 parts of performance regulating component, 10 parts of anti-shrinkage component, 7 parts of micropore filling component, and 2 parts of intercalation material component.

[0067] The active mineral component is S95 grade granulated blast furnace slag powder. The mass ratio of setting time regulating component A to strength regulating component B in the performance regulating components is 0.5:0.5. Setting time regulating component A is dihydrate gypsum after desulfurization and dewatering, and strength regulating component B is P·O425 cement. The anti-shrinkage component is pumice. The micropore filling component is a mixture of fly ash and silica fume, with a mass ratio of 1:0.5.

[0068] The preparation method of the slow-setting environmentally friendly fluidized solidified soil solidifier in this embodiment includes the following steps:

[0069] (1) The free water content of the setting time regulating component A, i.e., desulfurized gypsum, is reduced to less than 1% by natural sun drying; it is then ground in a vertical mill until the specific surface area is 300 m². 2 / kg or more.

[0070] (2) The setting time regulating component A after step (1) is mixed with the active mineral component, performance regulating component, anti-shrinkage component, micropore filling component and intercalation material component in a fiber mixer in proportion. The mixing time is 4 minutes and the mixing uniformity reaches more than 99% to obtain the slow-setting environmentally friendly fluidized solidified soil solidifier.

[0071] The slow-setting environmentally friendly fluidized solidified soil solidifier and dry silt obtained in this embodiment were mixed at a mass ratio of 1:10 and a water-to-solid ratio (the ratio of water to the mass of solidifier and silt) of 0.35:1. Specimens with dimensions of 70.7 mm × 70.7 mm × 70.7 mm were prepared according to the method in "Specification for Mix Proportioning Design of Cement-Soil" JGJ / T 233-2011. After 1 day, the specimens were demolded, and the unconfined compressive strength at 1 day, 2 days, 3 days, 7 days, and 28 days was tested according to the method in "Specification for Mix Proportioning Design of Cement-Soil" JGJ / T 233-2011. At the same time, the leaching concentration of harmful substances was tested according to "Integrated Wastewater Discharge Standard" GB 8978. Prismatic specimens with dimensions of 100 mm × 100 mm × 515 mm were prepared according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T 233-2011. The shrinkage rate at 3d, 7d, and 28d was tested according to the non-contact method in the "Standard for Test Methods of Long-Term Performance and Durability of Concrete" GB / T 50082-2024.

[0072] Example 3

[0073] A high-strength fluidized solidified soil curing agent, by weight, comprises the following raw materials: 60 parts of active mineral component, 30 parts of performance regulating component, 5 parts of anti-shrinkage component, 10 parts of micropore filling component, and 5 parts of intercalation material component.

[0074] The active mineral component is a mixture of S105 grade granulated blast furnace slag powder and volcanic ash, with a mass ratio of 1:0.1. The performance regulating components include setting time regulating component A and strength regulating component B, with a mass ratio of 0.5:0.5. Setting time regulating component A is hemihydrate gypsum after fluoride gypsum dewatering, and strength regulating component B is a mixture of cement clinker and CaO, with a mass ratio of 0.3:0.05. The anti-shrinkage component is expanded shale powder. The micropore filling component is fly ash.

[0075] The preparation method of the high-strength fluidized solidified soil solidifier in this embodiment includes the following steps:

[0076] (1) The free water content of the setting time control component A, i.e., fluorogypsum, was reduced to less than 1% by natural sun drying; it was then ground in a vertical mill until the specific surface area was 300 m². 2 / kg or more.

[0077] (2) The condensation time control component A after precipitation in step (1) is placed in a drying oven with a drying temperature of 150 °C and heated for 3 h, so that the content of hemihydrate calcium sulfate is not less than 95%.

[0078] (3) The setting time regulating component A after steps (1) and (2) is mixed with the active mineral component, performance regulating component, anti-shrinkage component, micropore filling component and intercalation material component in a fiber mixer according to the proportion. The mixing time is 6 min and the mixing uniformity reaches more than 99.5% to obtain a high-strength environmentally friendly fluid solidified soil solidifier.

[0079] The high-strength environmentally friendly fluidized solidified soil solidifier and dry silt obtained in this embodiment were mixed at a mass ratio of 1:10 and a water-to-solid ratio (the ratio of water to the mass of solidifier and silt) of 0.35:1. Specimens with dimensions of 70.7 mm × 70.7 mm × 70.7 mm were prepared according to the method in the "Specification for Mix Proportioning Design of Cement-Soil" JGJ / T 233-2011. After demolding for 1 day, the unconfined compressive strength at 1 day, 2 days, 3 days, 7 days, and 28 days was tested according to the method in the "Specification for Mix Proportioning Design of Cement-Soil" JGJ / T 233-2011. At the same time, the leaching concentration of harmful substances was tested according to the "Integrated Wastewater Discharge Standard" GB 8978. Prismatic specimens with dimensions of 100 mm × 100 mm × 515 mm were prepared according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T 233-2011. The shrinkage rate at 3d, 7d, and 28d was tested according to the non-contact method in the "Standard for Test Methods of Long-Term Performance and Durability of Concrete" GB / T 50082-2024.

[0080] Example 4

[0081] A common type of fluidized solidified soil curing agent, by weight, comprises the following raw materials: 60 parts of active mineral component, 20 parts of performance regulating component, 6 parts of anti-shrinkage component, 8 parts of micropore filling component, and 3 parts of intercalation material component.

[0082] The active mineral component is S95 grade granulated blast furnace slag powder. The performance regulating components include setting time regulating component A and strength regulating component B, with a mass ratio of 0.5:0.5. Setting time regulating component A is a mixture of dihydrate gypsum and hemihydrate gypsum after desulfurization and precipitation, with a mass ratio of 0.5:0.5. Strength regulating component B is P·O425 cement. The anti-shrinkage component is cross-linked sodium polyacrylate. The micropore filling component is ultrafine fly ash.

[0083] The preparation method of the common environmentally friendly fluidized solidified soil solidifier in this embodiment includes the following steps:

[0084] (1) The free water content of the setting time regulating component A, i.e., desulfurized gypsum, is reduced to less than 1% by natural sun drying; it is then ground in a vertical mill until the specific surface area is 300 m². 2 / kg or more.

[0085] (2) Place the condensation time control component A after precipitation in step (1) into a drying oven with a drying temperature of 160 °C and heat for 2 h so that the content of hemihydrate calcium sulfate is not less than 95%.

[0086] (3) The setting time regulating component A after steps (1) and (2) is mixed with the active mineral component, performance regulating component, anti-shrinkage component, micropore filling component and intercalation material component in proportion in the fiber mixer for 4 min. The mixing uniformity reaches more than 99%, and a common environmentally friendly fluidized solidified soil solidifying agent is obtained.

[0087] The ordinary fluidized solidified soil solidifier and dry silt obtained in this embodiment were mixed at a mass ratio of 1:10 and a water-to-solid ratio (the ratio of water to the mass of solidifier and silt) of 0.35:1. Specimens with dimensions of 70.7 mm × 70.7 mm × 70.7 mm were prepared according to the method in "Specification for Mix Proportioning Design of Cement-Soil" JGJ / T 233-2011. After 1 day, the specimens were demolded, and the unconfined compressive strength at 1 day, 2 days, 3 days, 7 days, and 28 days was tested according to the method in "Specification for Mix Proportioning Design of Cement-Soil" JGJ / T 233-2011. At the same time, the leaching concentration of harmful substances was tested according to "Integrated Wastewater Discharge Standard" GB 8978. Prismatic specimens with dimensions of 100 mm × 100 mm × 515 mm were prepared according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T 233-2011. The shrinkage rate at 3d, 7d, and 28d was tested according to the non-contact method in the "Standard for Test Methods of Long-Term Performance and Durability of Concrete" GB / T 50082-2024.

[0088] Comparative Example 1

[0089] The curing agent was P·O425 cement. P·O425 cement and dry silt were mixed at a mass ratio of 1:10 and a water-to-solid ratio (the ratio of water to the mass of the curing agent and silt) of 0.35:1. Specimens with dimensions of 70.7 mm × 70.7 mm × 70.7 mm were prepared according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T 233-2011. After demolding for 1 day, the unconfined compressive strength at 1 day, 2 days, 3 days, 7 days, and 28 days was tested according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T 233-2011. At the same time, the leaching concentration of harmful substances was tested according to the "Integrated Wastewater Discharge Standard" GB 8978. Prismatic specimens with dimensions of 100 mm × 100 mm × 515 mm were prepared according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T 233-2011. The shrinkage rate at 3d, 7d, and 28d was tested according to the non-contact method in the "Standard for Test Methods of Long-Term Performance and Durability of Concrete" GB / T 50082-2024.

[0090] Comparative Example 2

[0091] The curing agent was P·C425 cement. P·C425 cement and dry silt were mixed at a mass ratio of 1:10 and a water-to-solid ratio (the ratio of water to the mass of the curing agent and silt) of 0.35:1. Specimens with dimensions of 70.7 mm × 70.7 mm × 70.7 mm were prepared according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T 233-2011. After demolding for 1 day, the unconfined compressive strength at 1 day, 2 days, 3 days, 7 days, and 28 days was tested according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T 233-2011. At the same time, the leaching concentration of harmful substances was tested according to the "Integrated Wastewater Discharge Standard" GB 8978. Prismatic specimens with dimensions of 100 mm × 100 mm × 515 mm were prepared according to the method in the "Specification for Mix Proportioning Design of Cement and Soil" JGJ / T 233-2011. The shrinkage rate at 3d, 7d, and 28d was tested according to the non-contact method in the "Standard for Test Methods of Long-Term Performance and Durability of Concrete" GB / T 50082-2024.

[0092] Comparative Example 3

[0093] Compared to Example 1, it lacks the anti-shrinkage component.

[0094] Comparative Example 4

[0095] Compared to Example 1, it lacks the microporous filling component.

[0096] Comparative Example 5

[0097] Compared to Example 1, the intercalation material component is missing.

[0098] The performance of the solidified fluidized soil solidifiers prepared in Examples 1-4 and Comparative Examples 1-5 was tested. The results of the strength test are shown in Table 1, the results of the shrinkage test are shown in Table 2, and the leaching concentration of harmful substances is shown in Table 3.

[0099] Table 1. Strength test results of the solidifying agents for fluidized solidified soil prepared in Examples 1-4 and Comparative Examples 1-5

[0100]

[0101] Comparative analysis revealed that the 28-day unconfined compressive strength (2.86~5.57 MPa) of the environmentally friendly fluidized solidified soil curing agent with adjustable performance proposed in this invention is superior to that of traditional P·O425 cement (1.73 MPa) and P·C425 (1.43 MPa) cement-based fluidized solidified soils. Compared to Example 1, Comparative Example 3 lacks anti-shrinkage components, Comparative Example 4 lacks micropore-filling components, and Comparative Example 5 lacks intercalation material components; their strength performance is inferior to that of Example 1. In this invention, the strength of the fluidized solidified soil can be dynamically adjusted by controlling the type and content of each component.

[0102] Table 2 Shrinkage rates of solidifying agents for fluidized solidified soil prepared in Examples 1-4 and Comparative Examples 1-5

[0103]

[0104] As can be seen from Table 2, the shrinkage rate of the fluidized solidified soil prepared in Examples 1-4 of this invention is significantly better than that of Comparative Examples 1-3 without the addition of anti-shrinkage components. Therefore, the addition of anti-shrinkage components to the environmentally friendly fluidized solidified soil solidifier with adjustable performance proposed in this invention can significantly reduce the shrinkage rate of the fluidized solidified soil, demonstrating a significant anti-shrinkage effect.

[0105] Table 3. Leaching concentrations of harmful substances in the fluidized solidified soils prepared in Examples 1-4 and Comparative Examples 1-5

[0106]

[0107] As shown in Table 3, the fluidized bed solidifying agents prepared in Examples 1-4 of this invention can effectively solidify harmful ions and significantly reduce the leaching concentration of harmful substances in the fluidized bed solidifying soil. Intercalating material components were added in Comparative Examples 3-4; therefore, the fluidized bed solidifying agents in Comparative Examples 3-4 can also effectively solidify harmful ions. Compared to Example 1, Comparative Example 5 did not contain intercalating material components, and its measured total mercury value exceeded the limit requirement. Therefore, the intercalating material components in the fluidized bed solidifying agents prepared in this invention can effectively solidify harmful ions and significantly reduce the leaching concentration of harmful substances in the fluidized bed solidifying soil.

[0108] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An environmentally friendly flowable solidified soil stabilizer with adjustable performance, characterized by, By weight, the raw materials include: 40-70 parts of active mineral components, 10-30 parts of performance regulating components, 2-10 parts of anti-shrinkage components, 5-10 parts of micropore filling components, and 2-5 parts of intercalation material components. The active mineral component is at least one of the following: granulated blast furnace slag powder rich in active silica and alumina, converter steel slag powder, metakaolin, or volcanic ash. The performance regulating components include two types: setting time regulating component A and strength regulating component B; the setting time regulating component A is at least one of dihydrate gypsum or hemihydrate gypsum; the strength regulating component B is at least one of P·O425 cement, cement clinker, or CaO. The anti-shrinkage component includes at least one of starch acrylate polymer, expanded shale powder, pumice, or cross-linked sodium polyacrylate; The micropore filling component is one or both of ultrafine fly ash or silica fume; The intercalation material is composed of calcined dolomite rich in active MgO.

2. The environment-friendly flow solidified soil solidifying agent according to claim 1, wherein The specific surface area of the active mineral component is 350 m 2 2 / kg or more; or, when the active mineral component is a mixture of granulated blast furnace slag powder, converter slag powder, metakaolin, and volcanic ash, the mass ratio is 0.5-1:0-0.4:0-0.2:0-0.

1.

3. The environment-friendly flow solidified soil solidifying agent according to claim 1, characterized by The mass ratio of setting time regulating component A to strength regulating component B is 0.2~0.5:0.4~1; or, the dihydrate gypsum is naturally sun-dried or oven-dried dihydrate gypsum; the dihydrate gypsum is at least one of fluorogypsum, desulfurized gypsum, titanium gypsum, phosphogypsum, and limonite; or, the hemihydrate gypsum is obtained by dehydrating dihydrate gypsum; the dihydrate gypsum is at least one of fluorogypsum, desulfurized gypsum, titanium gypsum, phosphogypsum, and limonite; or, when using a mixture of dihydrate gypsum and hemihydrate gypsum, the mass ratio of the two is 0.1~0.9:0.1~0.

9. Alternatively, when the strength regulating component B is a mixture of P·O425 cement, cement clinker, and CaO, its mass ratio is 0.5~1:0~0.3:0~0.

1.

4. The environment-friendly flow solidified soil solidifying agent according to Claim 1, wherein When the anti-shrinkage component is a mixture of starch acrylate polymer, expanded shale powder, pumice, and cross-linked sodium polyacrylate, the mass ratio of the four components is 0~1:0~1:0~0.3:0~0.

1.

5. The environmentally friendly fluidized solidified soil solidifier as described in claim 1, characterized in that, The specific surface area of the micropore filling component is 500 m 2 2 / g or more; or, when the micropore filling component is a mixture of ultrafine fly ash and silica fume, the mass ratio of the two is 0.1-0.9:0.1-0.

9.

6. The environment-friendly flow solidified soil solidifying agent according to Claim 1, wherein The fluidized solidified soil curing agent is one of the following: early-strength, retarded, high-strength, and ordinary fluidized solidified soil curing agents; In the early-strength fluidized solidified soil solidifier, the active mineral component is at least one of granulated blast furnace slag powder rich in active silica and alumina, metakaolin, or volcanic ash; the setting time regulating component A is hemihydrate gypsum; and the strength regulating component B is cement clinker. In the slow-setting fluidized solidified soil solidifier, the setting time regulating component A is gypsum dihydrate; the strength regulating component B is at least one of P·O425 cement and CaO. In the high-strength fluidized solidified soil solidifier, the active mineral component is at least one of granulated blast furnace slag powder rich in active silica and alumina, metakaolin, or volcanic ash; the setting time regulating component A is hemihydrate gypsum; and the strength regulating component B is at least one of cement clinker or CaO. In the ordinary type of fluidized solidified soil curing agent, the setting time regulating component A is a mixture of dihydrate gypsum and hemihydrate gypsum; the micropore filling component is ultrafine fly ash.

7. The method of claim 6, wherein the fluidified soil solidifying agent is prepared by mixing the water-soluble polymer and the water-soluble inorganic salt in the water. The preparation methods of the ordinary, early-strength, and high-strength fluidized solidified soil solidifiers include the following steps: (1) The coagulation time regulating component A is subjected to natural airing or drying treatment until the free water content is less than or equal to 1%, and is ground until the specific surface area is greater than or equal to 300 m2 / g; 2 / kg or more; (2) Dry and heat component A after natural air drying or baking in step (1); (3) Mix the setting time regulating component A after step (2) with the active mineral component, performance regulating component, anti-shrinkage component, micropore filling component and intercalation material component in proportion to obtain a curing agent; In step (2), the drying heating temperature is 140~160 ℃.

8. The production method according to claim 7, wherein The drying temperature shall not be lower than 60°C; Alternatively, in step (2), the drying heating time is 2~10 h; Alternatively, in step (3), the mixing time is 4 to 10 minutes; the mixing uniformity is above 98%.

9. The method for preparing the fluidized solidified soil solidifier as described in claim 6, characterized in that, The preparation method of the retarded fluidized solidified soil solidifier includes the following steps: (1) Allow the coagulation time regulating component A to air dry or bake until the free water content is less than 1%, then grind it until the specific surface area is 300 m². 2 / kg or more; (2) Mix the setting time regulating component A after step (1) with the active mineral component, performance regulating component, anti-shrinkage component, micropore filling component and intercalation material component in proportion to obtain the curing agent.

10. The production method according to claim 9, wherein The drying temperature shall not be lower than 60°C; Alternatively, in step (2), the mixing time is 4 to 10 minutes; the mixing uniformity is above 98%.

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