Solid-liquid two-component high-fluidity soil curing agent and preparation method thereof

Abstract

The application belongs to the field of soil environment-friendly material solidification, and relates to a solid-liquid two-component high-fluidity soil solidifying agent and a preparation method thereof. The preparation raw materials of the solid-liquid two-component high-fluidity soil solidifying agent include a liquid component and a powder component. The liquid component includes deionized water, a dispersing agent, a bonding stabilizer, an end-capped isocyanate prepolymer microcapsule, a shrinkage reducing agent, hydroxypropyl methylcellulose, triethanolamine and ethylenediaminetetraacetic acid. The powder component includes a mineral admixture, a nano SiO2-Al2O3 composite, an expansive agent, polyacrylic acid sodium, micro-glass beads and hydroxypropyl methylcellulose. The application solves the problems of fast flowability attenuation and low early strength of the fluidity solidified soil in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of soil environmental protection material solidification, and relates to a solid-liquid two-component high fluidity soil solidifier and its preparation method. Background Technology

[0002] Fluidized solidified soil is an engineering material that transforms waste soil, silt, or industrial solid waste (such as alkali slag, slag, and fly ash) into self-leveling materials by adding a special solidifying agent. Its core technological value lies in achieving a dual breakthrough of "zero-pressure construction" and "in-situ resource utilization," effectively solving problems such as difficult waste disposal, low construction efficiency, and significant environmental impact in traditional earthwork engineering. This material is created by mixing waste soil, solidifying agent, water, and other industrial byproducts in a specific ratio to form a highly fluid slurry, which can be pumped and poured, then solidified naturally under certain structural strength to form a solidified body.

[0003] However, existing fluidized bed solidification technology still has significant drawbacks, severely limiting its large-scale application in construction engineering. Currently, the industry generally uses solidification agent systems based on inorganic cementitious materials (such as cement and lime). While these materials possess a certain degree of binding ability, they are difficult to effectively control the rheological properties of the slurry. Specifically, the fluidity of fluidized bed solidification decreases significantly with prolonged settling time. After mixing, it typically needs to be poured within 1 to 2 hours; otherwise, the pumpability drops sharply, leading to construction interruptions or quality issues.

[0004] Furthermore, traditional inorganic solidification systems suffer from slow early strength development, directly impacting construction time and structural forming efficiency, making it difficult to meet the demands of modern construction industry for rapid construction and strength development. Current technologies have not yet systematically resolved the contradiction between maintaining fluidity and synergistically improving early strength, hindering the widespread application of fluidized solidified soil in foundation backfilling, roadbed engineering, and underground structures. Summary of the Invention

[0005] To address the problems of rapid fluidity decay and low early strength in existing fluidized solidified soil technologies, this invention provides a solid-liquid two-component high fluidity soil solidifier and its preparation method.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] In a first aspect, the present invention provides a solid-liquid two-component high-fluidity soil stabilizer, wherein the raw materials for preparing the solid-liquid two-component high-fluidity soil stabilizer include 1 part liquid component and 10 parts powder component by mass ratio;

[0008] The liquid components, by mass percentage, include 55-65 parts deionized water, 7.0-12 parts dispersant, 5.0-9.0 parts binder stabilizer, 7.0-15.0 parts end-capped isocyanate prepolymer microcapsules, 3.0-5.0 parts shrinkage reducer, 0.2-0.5 parts hydroxypropyl methylcellulose, 5.0-9.0 parts triethanolamine, and 1.0-2.0 parts ethylenediaminetetraacetic acid.

[0009] The powder components, by mass percentage, include 72-76 parts of mineral admixture, 0.5-1.5 parts of nano-SiO2-Al2O3 composite, 8-12 parts of expanding agent, 0.4-0.8 parts of sodium polyacrylate, 12 parts of micron-sized glass microspheres, and 1.5-2.5 parts of hydroxypropyl methylcellulose.

[0010] Preferably, the dispersant is aminopropyltriethoxysilane or glycidoxypropyltrimethoxysilane.

[0011] Preferably, the adhesive stabilizer is a HEA-PEGDE secondary grafted modified chitosan.

[0012] Preferably, the shrinkage reducing agent includes one or more of polyethylene glycol, polyethylene glycol monomethyl ether, methyl allyl polyoxyethylene ether, and allyl alcohol polyoxyethylene ether.

[0013] Preferably, the ethylenediaminetetraacetic acid includes one or both of disodium EDTA and tetrasodium EDTA.

[0014] Preferably, the mineral admixture includes one or more of slag powder, silica fume, fly ash, and coal gangue powder.

[0015] Preferably, when the mineral admixture is a mixture of slag powder and silica fume, the mass ratio of slag powder to silica fume is 20:(4~7).

[0016] Preferably, the expanding agent includes one or more of calcium sulfoaluminate, calcium oxide, magnesium oxide, and gypsum.

[0017] Preferably, when the expanding agent is a mixture of calcium sulfoaluminate and magnesium oxide, the mass ratio of calcium sulfoaluminate to magnesium oxide is (1~2):1.

[0018] Secondly, the present invention provides a method for preparing a solid-liquid two-component high-fluidity soil stabilizer, wherein the preparation method of the liquid component includes:

[0019] Heat deionized water, add triethanolamine to the deionized water and stir until completely dissolved, then add shrinkage reducing agent and ethylenediaminetetraacetic acid in sequence, and stir until a homogeneous solution is formed;

[0020] A binder stabilizer is added dropwise to the homogeneous solution, followed by ultrasonic emulsification and dispersion.

[0021] A dispersant and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred to obtain a fluid with shear-thinning properties.

[0022] The fluid is cooled down, and end-capped isocyanate prepolymer microcapsules are introduced into the fluid under negative pressure. The mixture is stirred and mixed evenly to obtain the liquid component.

[0023] The preparation method of the powder component includes:

[0024] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed, heated and stirred to obtain mixture A;

[0025] Mixture A, mineral admixtures, expanding agent and sodium polyacrylate are mixed and stirred to obtain mixture B;

[0026] Micron-sized glass beads were added to the mixture B, and the powder component was obtained after stirring.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The dispersant in the liquid component and sodium polyacrylate in the powder component work together through electrostatic repulsion and steric hindrance to ensure the slurry has extremely high initial fluidity and effectively prevent particle sedimentation and segregation. The binder stabilizer and hydroxypropyl methylcellulose synergistically construct a three-dimensional network structure, encapsulating free water and significantly improving the suspension stability and fluidity retention of the slurry over time. The end-capped isocyanate prepolymer microcapsules achieve a precise pH-triggered response, rapidly releasing active -NCO groups in the alkaline environment after casting to form a polyurea network, thereby endowing the solidified soil with excellent early strength. Ethylenediaminetetraacetic acid (EDTA) regulates the activity of metal ions in stages through chelation, avoiding fluidity loss caused by early ineffective reactions and providing a stable ion source for later strength development. The nano-SiO2-Al2O3 composite in the powder component acts as a highly active nucleation site to accelerate hydration and optimize the pore structure. It works synergistically with the expansion agent and micron-sized glass microspheres to effectively compensate for shrinkage and buffer internal stress, jointly ensuring the excellent volume stability and long-term durability of the solidified body. Detailed Implementation

[0029] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0030] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0031] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0032] In this article, unless otherwise specified, “contains,” “includes,” “containing,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of,” for example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a.”

[0033] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0034] The first objective of this invention is to provide a solid-liquid two-component high-fluidity soil stabilizer, wherein the raw materials for preparing the solid-liquid two-component high-fluidity soil stabilizer include 1 part liquid component and 10 parts powder component by mass ratio;

[0035] The liquid components, by mass percentage, include 55-65 parts deionized water, 7.0-12 parts dispersant, 5.0-9.0 parts binder stabilizer, 7.0-15.0 parts end-capped isocyanate prepolymer microcapsules, 3.0-5.0 parts shrinkage reducer, 0.2-0.5 parts hydroxypropyl methylcellulose, 5.0-9.0 parts triethanolamine, and 1.0-2.0 parts ethylenediaminetetraacetic acid.

[0036] The powder components, by mass percentage, include 72-76 parts of mineral admixture, 0.5-1.5 parts of nano-SiO2-Al2O3 composite, 8-12 parts of expanding agent, 0.4-0.8 parts of sodium polyacrylate, 12 parts of micron-sized glass microspheres, and 1.5-2.5 parts of hydroxypropyl methylcellulose.

[0037] The role of the liquid components is to provide immediate regulation, activation, and initial structure construction. Deionized water, as the solvent, provides a stable medium for the various chemical reactions. The dispersant effectively adsorbs onto the surface of soil particles, breaking down the flocculated structure of the soil particles through strong electrostatic repulsion and steric hindrance, ensuring full dispersion and giving the slurry extremely high initial fluidity. The binder and stabilizer uses a special secondary grafted modified chitosan, whose long molecular chains can rapidly extend in water, encapsulating and fixing free water through hydrogen bonds and van der Waals forces to form a three-dimensional network structure. This not only effectively prevents segregation and bleeding of the slurry but also provides excellent suspension stability, ensuring the long-term retention of fluidity. End-capped isocyanate prepolymer microcapsules encapsulate highly active isocyanate (-NCO) groups within the microcapsules using an end-capping agent, maintaining chemical inertness during the initial stirring stage and preventing a sudden increase in viscosity due to premature reaction. Only after pouring, when the microcapsule wall material in the alkaline environment is disrupted and the end-capping agent is unsealed, are the active -NCO groups precisely released. These groups rapidly react with the hydroxyl groups in water and soil particles to form a polyurea network structure, thus quickly building early strength. Shrinkage reducing agents lower the surface tension of the pore solution in the slurry, thereby reducing the capillary negative pressure generated during drying and self-shrinkage, controlling early shrinkage cracking. Hydroxypropyl methylcellulose further enhances the water-retention and thickening effect; its hydration film in water reduces the rate of water evaporation and works synergistically with the binder stabilizer to ensure the system's workability. Triethanolamine accelerates the hydration reaction of inorganic cementitious materials and assists in the dissolution of the stabilizer. Ethylenediaminetetraacetic acid preferentially reacts with polyvalent metal ions (such as Ca2+) in the soil and hydration products. 2+ Al 3+ It forms stable soluble complexes, inhibits the chemical activity of these ions, and prevents them from prematurely forming insoluble precipitates that would impair fluidity; then it is slowly released when the pH of the system changes or the ion concentration is adjusted, thereby delaying its participation in the hydration reaction, while avoiding fluidity loss and strength development obstacles caused by premature reaction.

[0038] The powder components provide a long-term strength framework, compensate for shrinkage, and enhance durability. Mineral admixtures form the foundation of the system's strength; their active components react in an alkaline environment to generate gelling products that continuously fill pores and create a dense structure, providing sustained growth in later-stage strength. Nano-SiO2-Al2O3 composites possess extremely high specific surface area and reactivity, acting as nucleation sites to accelerate hydration reactions. Their core-shell structure also fills micro- and nano-sized pores, optimizing the pore structure and improving the density and mechanical properties of the solidified body. The expanding agent, through moderate expansion at a specific hydration age, counteracts chemical and drying shrinkage caused by hydration and drying. Sodium polyacrylate, as a high-molecular-weight polymer, extends its long molecular chains in the slurry, further enhancing interparticle repulsion through steric hindrance. Synergistically, it works with the dispersant in the liquid components to maintain the slurry's excellent rheological properties and suspension stability. Micron-sized glass microspheres, as inert microspheres, act as "ball bearings" in the slurry, improving its flowability. Furthermore, their closed-cell structure effectively buffers internal stress and reduces shrinkage. Hydroxypropyl methylcellulose is added to the powder to create a gradient dissolution with similar components in the liquid, ensuring continuous water retention and thickening throughout the hydration process.

[0039] In summary, this invention combines the intervention of liquid components in the reaction process with the reinforcement of the final structure by powder components, enabling fluidized solidified soil to simultaneously possess key properties such as high fluidity, high early strength, and long-term durability.

[0040] The deionized water required to have a resistivity (25℃) ≥ 18.2 MΩ·cm, turbidity ≤ 0.1 NTU, and a pH value of 6.5~7.5 at room temperature (25℃). This invention uses high-purity deionized water as a solvent, which can completely eliminate common impurity ions in ordinary water (such as Ca). 2+ Mg 2+ Cl - Uncontrollable interference with the complex chemical reactions of the system (etc.).

[0041] The dispersant is either aminopropyltriethoxysilane or glycidoxypropyltrimethoxysilane. These organosilane dispersants not only significantly enhance the interfacial adhesion between the curing agent and the soil by forming strong covalent bonds with the silanol groups (-Si-OH) generated after hydrolysis, but also simultaneously construct an effective steric hindrance layer on the particle surface, achieving a superior dispersion effect far exceeding that of traditional dispersants.

[0042] The adhesive stabilizer is a hydroxyethyl acrylate (HEA)-polyethylene glycol diglycidyl ether (PEGDE) secondary graft modified chitosan. This adhesive stabilizer is modified twice via chemical grafting to construct a gel framework with a dense filling effect. The preparation method of this HEA-PEGDE secondary graft modified chitosan includes:

[0043] Purified chitosan was dissolved in a 2% (w / w) aqueous solution of acetic acid at a solid-liquid ratio of 1:20 (g:mL). 30% (w / w) of hydroxyethyl acrylate was added, and the mixture was stirred until homogeneous. Under nitrogen inert gas protection, the mixture was stirred at 300 rpm in a constant temperature water bath at 60-65℃ for 6-8 hours until the solution was transparent and homogeneous, yielding a preliminary modified product. The preliminary modified product was dissolved in anhydrous ethanol at a solid-liquid ratio of 1:25 (g:mL). 25% (w / w) of polyethylene glycol glycidyl ether with a molecular weight of 400-1000 Da was added. A secondary grafting reaction was carried out in a constant temperature water bath at 70-75℃ with stirring at 250 rpm for 4-6 hours. After the reaction, the product was poured into excess acetone to precipitate. After washing repeatedly with anhydrous ethanol 3-4 times, the product was dried in a vacuum drying oven at 60℃ for 12 hours, finally yielding HEA-PEGDE secondary grafted modified chitosan.

[0044] Chitosan is prepared primarily from shrimp and crab shells, with a deacetylation degree greater than 80%, a molecular weight controlled between 20 and 30 kDa, and a cold water solubility ≥5%, ensuring its excellent reactivity and solubility. This modification process, by introducing different functional groups and flexible long chains onto the chitosan molecular chain, significantly enhances its extensibility, complexing ability, and steric stability in aqueous systems. This effectively encapsulates free water, inhibits particle segregation, and strengthens the three-dimensional gel network through covalent cross-linking, achieving dense filling of pores and ultimately improving the suspension stability, early structural strength, and long-term durability of the solidified soil.

[0045] The terminated isocyanate prepolymer microcapsules use an aromatic MDI (diphenylmethane diisocyanate)-based prepolymer as the core and introduce polyether-type polyols (such as styrene-propylene-epoxy copolymer ether or polytetramethylene ether glycol) to enhance intermolecular forces. The terminator is a bisulfite and the wall material is a resin.

[0046] The preparation method of the microcapsules includes: reacting isocyanate with polyol under an inert atmosphere to generate terminal-NCO prepolymer, and then performing a capping reaction with sodium bisulfite at 60~80℃ to obtain a capped prepolymer, forming a room-temperature stable R-NHCO-SO3Na structure to passivate the -NCO activity; dispersing the capped prepolymer in an aqueous phase containing an emulsifier, shearing and dispersing it into an emulsion, and introducing melamine-formaldehyde prepolymer for crosslinking polymerization; finally, obtaining capped isocyanate prepolymer microcapsules after filtration, washing and drying.

[0047] For example: Under a nitrogen inert atmosphere, aromatic MDI and polyether polyol are mixed at a molar ratio of 3:1 and reacted at 70-75°C with stirring at 400 rpm for 2 hours to generate a prepolymer with a terminal -NCO mass fraction of 10%-12%. The prepolymer is then cooled to 60-80°C, and a 15% sodium bisulfite aqueous solution is added at a molar ratio of sodium bisulfite to terminal -NCO groups of 1.1:1. The mixture is then stirred at high speed at 500 rpm for 1.5-2 hours to carry out a capping reaction, obtaining a capped prepolymer that forms a room-temperature stable R-NHCO-SO3Na structure to passivate -NCO activity. The capped prepolymer is then mixed with deionized water at a mass ratio of 1:4, and... 0.8% of Tween-80 emulsifier was added to the system and dispersed at 10,000 rpm for 5 min to form an oil-in-water emulsion. The emulsion temperature was adjusted to 55-60℃, and 8% of melamine-formaldehyde prepolymer (melamine to formaldehyde molar ratio 1:3) was added. The pH of the system was adjusted to 4.0-4.5 with 10% citric acid solution. The crosslinking polymerization reaction was carried out at 55-60℃ with stirring for 3-4 h. After the reaction, the product was filtered, washed with deionized water until neutral, and vacuum dried at 50℃ for 10 h. Finally, after filtration, washing and drying, end-capped isocyanate prepolymer microcapsules with a particle size of 50-100 μm were obtained.

[0048] This microcapsule achieves a precise pH-triggered response: in an alkaline environment (pH > 11), the wall material gradually hydrolyzes, and the end-capping groups are activated by OH groups. - Catalytic dissociation, coupled with the intensifying effects of stirring, shearing, and exothermic reaction, rapidly releases active -NCO groups and reacts with moisture or hydroxyl components in the soil, quickly forming a polyurea network structure within 60-90 minutes, thereby significantly improving the early strength of the solidified soil.

[0049] The shrinkage-reducing agents include one or more of polyethylene glycol, polyethylene glycol monomethyl ether, methyl allyl polyoxyethylene ether, and allyl alcohol polyoxyethylene ether. These polyether-based shrinkage-reducing agents contain a large number of ether bonds (-O-) and hydroxyl groups (-OH) in their molecular structure, enabling them to effectively reduce the surface tension of capillary water in the pores of solidified soil. Through this mechanism, they can significantly reduce the negative pressure generated by capillary water loss during cement hydration and moisture evaporation, thereby reducing the plastic shrinkage and drying shrinkage of the material at its source.

[0050] The hydroxypropyl methylcellulose in the liquid component is selected with a medium viscosity grade and a particle size of 80-100 mesh. Its fine particle size ensures rapid dispersion and hydration in the mixing water, quickly forming a uniform water-retaining network throughout the slurry. The medium viscosity effectively thickens the slurry, preventing particle settling and bleeding, while avoiding excessive viscosity that could impede flow. This significantly reduces the risk of early cracking caused by moisture evaporation during the initial stages of construction and provides a stable water environment for the full reaction of other components.

[0051] The triethanolamine is required to have a purity of over 90%. High-purity triethanolamine can effectively avoid uncontrollable interference to the complex chemical reactions of the system caused by impurities (such as monoethanolamine, diethanolamine, or residual alkali) commonly found in low-purity products.

[0052] The ethylenediaminetetraacetic acid includes one or both of disodium EDTA and tetrasodium EDTA. These substances, due to their strong chelating ability, can preferentially bind to polyvalent metal ions (such as Ca2+) in the system during the initial stages of hydration. 2+ Mg 2+ Al 3+ This process forms stable water-soluble complexes, enabling precise, phased control of ionic activity. This effectively prevents metal ions from prematurely forming insoluble precipitates or being consumed in ineffective hydration, significantly mitigating the loss of fluidity over time and ensuring the necessary workable time for construction. As the hydration process progresses and the system pH changes, these complexed ions are slowly released, serving as effective supplementary components in subsequent hydration reactions to generate strength-enhancing cementitious substances. This avoids strength development obstacles caused by early ineffective ion consumption, thus synergistically optimizing the overall performance of the solidified soil from the construction phase to the hardening phase.

[0053] The mineral admixture includes one or more of slag powder, silica fume, fly ash, and coal gangue powder, and when the mineral admixture is a mixture of slag powder and silica fume, the mass ratio of slag powder to silica fume is 20:(4~7), and the fineness is S95.

[0054] The aforementioned nano-SiO2-Al2O3 composite has a core-shell structure formed by SiO2 coating Al2O3, and its specific surface area is controlled at 400~450m². 2The composite has a particle size distribution of 50-100 nm and a surface potential of less than -30 mV. Its high specific surface area significantly enhances its reactivity. The core-shell structure and significantly negative surface potential work together to effectively strengthen the electrostatic repulsion between particles, prevent agglomeration and flocculation, improve particle dispersibility, and thus significantly reduce the system viscosity and optimize the slurry rheology.

[0055] The expanding agent includes one or more of calcium sulfoaluminate, calcium oxide, magnesium oxide, and gypsum. When the expanding agent is a mixture of calcium sulfoaluminate and magnesium oxide, the mass ratio of calcium sulfoaluminate to magnesium oxide is (1~2):1, and the magnesium oxide selected is light-calcined magnesium oxide with an iodine adsorption activity value of 60~150s. Calcium sulfoaluminate hydrates rapidly and can generate moderate expansion in the early stage by forming ettringite, effectively compensating for the chemical shrinkage during the plastic stage of the slurry. Light-calcined magnesium oxide has high activity, and its volume expansion process of hydration to form magnesium hydroxide (Mg(OH)2) is relatively slow and continuous, which can further compensate for drying shrinkage in the middle stage. The two components achieve the connection and superposition of expansion processes through ratio optimization, avoiding the problem of excessively rapid or large expansion in the early stage or insufficient expansion in the later stage of a single component, thereby significantly improving the volume stability of the solidified body and effectively preventing cracking. At the same time, the use of highly active light-calcined magnesium oxide also ensures the full utilization of the expansion effect.

[0056] Sodium polyacrylate is preferably a white powder with a high solids content and a molecular weight controlled between 30 million and 50 million. This polymer, with its ultra-long molecular chain structure, can fully extend within the system, effectively preventing the sedimentation and flocculation of solid particles through a strong steric hindrance effect, significantly improving the suspension stability of the slurry, thereby ensuring the uniformity and workability of the fluidized solidified soil during construction.

[0057] Micron-sized glass microspheres are hollow, closed spherical micron-sized inorganic particles. Their unique "ball bearing" effect can effectively reduce interparticle friction, significantly improve the rheological properties of the slurry, and enhance the initial fluidity. In addition, as rigid microspheres, they can be uniformly dispersed in the system, buffering the internal stress caused by hydration shrinkage or temperature changes, and reducing the generation of internal microcracks.

[0058] The hydroxypropyl methylcellulose (HPMC) in the powder component is preferably a low-temperature gel type, with its methoxy content controlled within a specific range of 22% to 30%. This type of cellulose ether can form a denser hydration film before the system's hydration exothermic heating (i.e., at a lower temperature), effectively binding free water. As the hydration process consumes water in the liquid phase, the HPMC in the powder component is gradually released and dissolved, continuously replenishing the water-retaining system weakened by water consumption, significantly improving the system's water retention performance, thereby effectively mitigating the risk of plastic shrinkage and surface cracking.

[0059] A second objective of this invention is to provide a method for preparing a solid-liquid two-component high-fluidity soil stabilizer, wherein the method for preparing the liquid component includes:

[0060] Heat deionized water to 40-60°C, add triethanolamine to the deionized water and stir until completely dissolved, then add shrinkage reducing agent and ethylenediaminetetraacetic acid in sequence, stirring until a homogeneous solution is formed;

[0061] Add the binder stabilizer dropwise to the homogeneous solution and then ultrasonically emulsify and disperse it at 15~50kHz until it turns pale blue.

[0062] A dispersant and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at a speed of 500~1000 rpm for 10~20 min to obtain a fluid with shear-thinning properties.

[0063] The fluid is cooled to 0~10℃, and end-capped isocyanate prepolymer microcapsules are introduced into the fluid under negative pressure. The mixture is stirred at 100~300rpm for 20~30min until it is homogeneous to obtain the liquid component.

[0064] The preparation of the liquid components begins with preheating and dissolving triethanolamine to provide a stable alkaline environment for subsequent reactions. Gradual feeding and ultrasonic emulsification enable the hydrophobic binder stabilizer to form a uniform and stable colloidal dispersion, effectively leveraging its key role in "encapsulating free water and constructing a three-dimensional network." Shear stirring allows the organosilane dispersant and hydroxypropyl methylcellulose to fully interact, synergistically optimizing the slurry rheology. Finally, under low temperature and negative pressure conditions, end-capped isocyanate microcapsules are introduced to minimize premature rupture and unintended reactions, ensuring the product's storage stability and precise triggering of the rapid curing effect during construction.

[0065] The preparation method of the powder component includes:

[0066] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80~120℃ and 1000~2000rpm for 20~30min to prevent hydration and agglomeration of nanomaterials, to obtain mixture A;

[0067] Mixture A, mineral admixture, expanding agent and sodium polyacrylate are mixed and stirred at 50-100 rpm for 10-15 min to obtain mixture B; micron-sized glass microspheres are added to mixture B and stirred at 50-100 rpm for 20-30 min to obtain the powder component.

[0068] The preparation of the powder components first involves organically coating the nano-SiO2-Al2O3 composite. Under heating and shearing, the hydration of its surface hydroxyl groups and the tendency of particle aggregation are effectively suppressed, significantly improving the dispersibility and reactivity of the nanomaterials in the system. Subsequently, through a hierarchical mixing strategy, mineral admixtures, expanding agents, and dry powder materials such as sodium polyacrylate are uniformly mixed in sequentially, ensuring the homogeneity and batch stability of the functional component distribution. Finally, micron-sized glass microspheres are introduced at low speed to avoid damage to the hollow microspheres caused by mechanical shearing, thus perfectly preserving their ball lubrication effect and stress buffering function.

[0069] In summary, this invention effectively resolves material compatibility issues through the complementary mechanisms of a powder and liquid two-component system. It provides excellent high flowability by working synergistically from three dimensions: electrostatic repulsion, steric hindrance, and reduced particle viscosity. Specifically, sodium polyacrylate prevents flocculation and improves rheological properties through side-chain steric hindrance and electrostatic repulsion; nano-SiO2-Al2O3 adsorbs between particles to form a sliding layer; and organosilicon permeates the interparticle gaps to form a hydrophobic film, synergistically reducing particle viscosity. Simultaneously, the water-retaining properties of hydroxypropyl methylcellulose synergistically enhance flowability with polyether-based shrinkage-reducing agents. Furthermore, EDTA is utilized in the early stages of the reaction. 4- The tetradentate ligand structure fixes and releases Ca in stages. 2+ Mg 2+ Al 3+ Metal ions are encapsulated within a cavity to prevent contact with active groups, forming a soluble complex salt. This avoids precipitation and also serves as a calcium and aluminum source during hydration, preventing loss of fluidity and strength. Hydroxypropyl methylcellulose forms a hydrogen-bonded water film to reduce the rate of water evaporation. Polyether shrinkage reducers, hollow glass microspheres, and expansion agents control volume stability. The -NCO released from the microcapsules reacts with water to generate polyurea filler and CO2. The CO2 then carries away the calcium... 2+ The hollow glass microspheres, converted into high-solid-volume CaCO3, buffer shrinkage stress and assist in CO2 storage, further repairing cracks caused by internal hydration reactions. Calcium sulfoaluminate and magnesium oxide compensate for drying shrinkage by delaying expansion, ensuring volume stability in the later stages. Furthermore, this invention solves the problem of coexistence between chitosan and isocyanate prepolymers in its preparation process. On one hand, the alkaline environment provided by triethanolamine promotes the dissolution of chitosan and regulates the dissolution rate of ions in the system, laying the foundation for subsequent reactions. On the other hand, the active groups (-NCO) in the isocyanate prepolymer react with water and hydroxyl groups after casting, rapidly generating a polyurea structure, imparting early strength to the solidified body within 1-3 hours. Simultaneously, the dissolved chitosan molecular chains not only encapsulate free water and inhibit segregation through a three-dimensional network, but also undergo covalent reactions with nano-SiO2-Al2O3 composites, slowly forming a dense gel network to fill pores, thereby ensuring the long-term durability of the solidified body and the toughness of the soil.

[0070] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0071] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" refers to weight percentage, "parts" refers to parts by weight, and "ratio" refers to weight proportion.

[0072] Example 1

[0073] 1. Preparation of liquid components

[0074] Weigh out the following components by weight: 55.0 parts deionized water, 7.0 parts aminopropyltriethoxysilane, 5.0 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 7.0 parts end-capped isocyanate prepolymer microcapsules, 3.0 parts polyethylene glycol, 0.2 parts hydroxypropyl methylcellulose, 5.0 parts triethanolamine, and 1.0 part disodium EDTA.

[0075] Heat deionized water to 40°C, add triethanolamine to the deionized water and stir until completely dissolved, then add polyethylene glycol and disodium EDTA in sequence and stir until a clear and homogeneous solution is formed.

[0076] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 15 kHz until it turns pale blue.

[0077] Aminopropyltriethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 500 rpm for 10 min to obtain a fluid with shear-thinning properties.

[0078] The fluid was cooled to 10°C in an ice bath, and end-capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 100 rpm for 20 minutes until homogeneous to obtain the liquid component.

[0079] 2. Preparation of powder components

[0080] Weigh out the following components by mass ratio: 72 parts slag powder, 0.5 parts nano-SiO2-Al2O3 composite, 8 parts calcium sulfoaluminate, 0.4 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 1.5 parts hydroxypropyl methylcellulose.

[0081] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80℃ and 1000rpm for 20min to obtain mixture A;

[0082] Mixture A, slag powder, calcium sulfoaluminate and sodium polyacrylate were mixed and stirred at 50 rpm for 15 min to obtain mixture B; micron-sized glass beads were added to mixture B and stirred at 50 rpm for 30 min to obtain the powder component.

[0083] 3. Implementation process

[0084] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0085] Example 2

[0086] 1. Preparation of liquid components

[0087] Weigh out the following components by weight: 65.0 parts deionized water, 12.0 parts aminopropyltriethoxysilane, 9.0 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 15.0 parts end-capped isocyanate prepolymer microcapsules, 5.0 parts polyethylene glycol monomethyl ether, 0.5 parts hydroxypropyl methylcellulose, 9.0 parts triethanolamine, and 2.0 parts tetrasodium EDTA.

[0088] Heat deionized water to 50°C, add triethanolamine to the deionized water and stir until completely dissolved, then add polyethylene glycol monomethyl ether and EDTA tetrasodium salt in sequence and stir until a clear and homogeneous solution is formed.

[0089] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 25 kHz until it turns pale blue.

[0090] Aminopropyltriethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 750 rpm for 15 min to obtain a fluid with shear-thinning properties.

[0091] The fluid was cooled to 0°C in an ice bath, and then capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 200 rpm for 25 min until homogeneous to obtain the liquid component.

[0092] 2. Preparation of powder components

[0093] Weigh out the following components by mass ratio: 76 parts silica fume, 1.5 parts nano-SiO2-Al2O3 composite, 12 parts calcium oxide, 0.8 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 2.5 parts hydroxypropyl methylcellulose.

[0094] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 100℃ and 1500rpm for 25min to obtain mixture A;

[0095] Mixture A, silica fume, calcium oxide and sodium polyacrylate are mixed and stirred at 100 rpm for 10 min to obtain mixture B; micron-sized glass microspheres are added to mixture B and stirred at 100 rpm for 20 min to obtain the powder component.

[0096] 3. Implementation process

[0097] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0098] Example 3

[0099] 1. Preparation of liquid components

[0100] Weigh out the following components by weight: 55.0 parts deionized water, 12.0 parts aminopropyltriethoxysilane, 9.0 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 15.0 parts end-capped isocyanate prepolymer microcapsules, 5.0 parts methyl allyl polyoxyethylene ether, 0.2 parts hydroxypropyl methylcellulose, 5.0 parts triethanolamine, and 1.5 parts disodium EDTA.

[0101] Heat deionized water to 60°C, add triethanolamine to the deionized water and stir until completely dissolved, then add methyl allyl polyoxyethylene ether and disodium EDTA in sequence and stir until a clear and homogeneous solution is formed.

[0102] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 35 kHz until it turns pale blue.

[0103] Aminopropyltriethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 1000 rpm for 20 min to obtain a fluid with shear-thinning properties.

[0104] The fluid was cooled to 5°C in an ice bath, and then capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 300 rpm for 30 min until homogeneous to obtain the liquid component.

[0105] 2. Preparation of powder components

[0106] Weigh out the following components by mass ratio: 72 parts fly ash, 1.5 parts nano-SiO2-Al2O3 composite, 12 parts magnesium oxide, 0.8 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 1.5 parts hydroxypropyl methylcellulose.

[0107] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 120℃ and 2000rpm for 30min to obtain mixture A;

[0108] Mixture A, fly ash, magnesium oxide and sodium polyacrylate were mixed and stirred at 75 rpm for 12 min to obtain mixture B; micron-sized glass beads were added to mixture B and stirred at 75 rpm for 25 min to obtain the powder component.

[0109] 3. Implementation process

[0110] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0111] Example 4

[0112] 1. Preparation of liquid components

[0113] Weigh out the following components by weight: 65.0 parts deionized water, 7.0 parts aminopropyltriethoxysilane, 6.0 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 8.0 parts end-capped isocyanate prepolymer microcapsules, 3.0 parts allyl alcohol polyoxyethylene ether, 0.5 parts hydroxypropyl methylcellulose, 9.0 parts triethanolamine, and 1.0 part disodium EDTA.

[0114] Heat deionized water to 40°C, add triethanolamine to the deionized water and stir until completely dissolved, then add allyl alcohol polyoxyethylene ether and disodium EDTA in sequence and stir until a clear and homogeneous solution is formed.

[0115] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution dropwise per minute, and then ultrasonically emulsify and disperse the mixture at 45 kHz until it turns pale blue.

[0116] Aminopropyltriethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 500 rpm for 10 min to obtain a fluid with shear-thinning properties.

[0117] The fluid was cooled to 10°C in an ice bath, and end-capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 100 rpm for 20 minutes until homogeneous to obtain the liquid component.

[0118] 2. Preparation of powder components

[0119] Weigh out the following components by weight: 76 parts coal gangue powder, 0.5 parts nano-SiO2-Al2O3 composite, 8 parts gypsum, 0.4 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 2.5 parts hydroxypropyl methylcellulose.

[0120] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80℃ and 1000rpm for 20min to obtain mixture A;

[0121] Mixture A, coal gangue powder, gypsum and sodium polyacrylate were mixed and stirred at 50 rpm for 15 min to obtain mixture B; micron-sized glass beads were added to mixture B and stirred at 50 rpm for 30 min to obtain the powder component.

[0122] 3. Implementation process

[0123] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0124] Example 5

[0125] 1. Preparation of liquid components

[0126] Weigh out the following components by weight: 60.0 parts deionized water, 10.0 parts aminopropyltriethoxysilane, 7.0 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 10.0 parts end-capped isocyanate prepolymer microcapsules, 2.0 parts polyethylene glycol, 2.0 parts polyethylene glycol monomethyl ether, 0.5 parts hydroxypropyl methylcellulose, 7.5 parts triethanolamine, 0.5 parts disodium EDTA, and 1.0 part tetrasodium EDTA.

[0127] Heat deionized water to 40°C, add triethanolamine to the deionized water and stir until completely dissolved, then add polyethylene glycol, polyethylene glycol monomethyl ether, disodium EDTA, and tetrasodium EDTA in sequence, and stir until a transparent and homogeneous solution is formed.

[0128] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 50 kHz until it turns pale blue.

[0129] Aminopropyltriethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 500 rpm for 10 min to obtain a fluid with shear-thinning properties.

[0130] The fluid was cooled to 10°C in an ice bath, and end-capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 100 rpm for 20 minutes until homogeneous to obtain the liquid component.

[0131] 2. Preparation of powder components

[0132] Weigh out the following components by weight: 60 parts slag powder, 12 parts silica fume powder, 1.0 part nano-SiO2-Al2O3 composite, 6 parts calcium sulfoaluminate, 6 parts magnesium oxide, 0.6 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 2.0 parts hydroxypropyl methylcellulose.

[0133] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80℃ and 1000rpm for 20min to obtain mixture A;

[0134] Mixture A, slag powder, silica fume, calcium sulfoaluminate, magnesium oxide, and sodium polyacrylate were mixed and stirred at 50 rpm for 15 min to obtain mixture B; micron-sized glass microspheres were added to mixture B and stirred at 50 rpm for 30 min to obtain the powder component.

[0135] 3. Implementation process

[0136] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0137] Example 6

[0138] 1. Preparation of liquid components

[0139] Weigh out the following components by weight: 55.0 parts deionized water, 8.5 parts glycidyl etheroxypropyltrimethoxysilane, 6.0 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 8.0 parts end-capped isocyanate prepolymer microcapsules, 1.0 part polyethylene glycol, 2.5 parts methyl allyl polyoxyethylene ether, 0.3 parts hydroxypropyl methylcellulose, 6.0 parts triethanolamine, and 1.2 parts disodium EDTA.

[0140] Heat deionized water to 40°C, add triethanolamine to the deionized water and stir until completely dissolved, then add polyethylene glycol, methyl allyl polyoxyethylene ether and disodium EDTA in sequence, and stir until a clear and homogeneous solution is formed.

[0141] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 15 kHz until it turns pale blue.

[0142] Glycidyl etheroxypropyltrimethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 500 rpm for 10 min to obtain a fluid with shear-thinning properties.

[0143] The fluid was cooled to 10°C in an ice bath, and end-capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 100 rpm for 20 minutes until homogeneous to obtain the liquid component.

[0144] 2. Preparation of powder components

[0145] Weigh out the following components by weight: 56 parts slag powder, 19.6 parts silica fume powder, 0.8 parts nano-SiO2-Al2O3 composite, 6 parts calcium sulfoaluminate, 3 parts magnesium oxide, 0.5 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 2.5 parts hydroxypropyl methylcellulose.

[0146] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80℃ and 1000rpm for 20min to obtain mixture A;

[0147] Mixture A, slag powder, silica fume, calcium sulfoaluminate, magnesium oxide, and sodium polyacrylate were mixed and stirred at 50 rpm for 15 min to obtain mixture B; micron-sized glass microspheres were added to mixture B and stirred at 50 rpm for 30 min to obtain the powder component.

[0148] 3. Implementation process

[0149] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0150] Example 7

[0151] 1. Preparation of liquid components

[0152] Weigh out the following components by weight: 65.0 parts deionized water, 10.5 parts aminopropyltriethoxysilane, 8.0 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 12.0 parts end-capped isocyanate prepolymer microcapsules, 2.0 parts polyethylene glycol, 2.5 parts allyl alcohol polyoxyethylene ether, 0.4 parts hydroxypropyl methylcellulose, 8.0 parts triethanolamine, and 1.8 parts disodium EDTA.

[0153] Heat deionized water to 40°C, add triethanolamine to the deionized water and stir until completely dissolved, then add polyethylene glycol, allyl alcohol polyoxyethylene ether and disodium EDTA in sequence, and stir until a clear and homogeneous solution is formed.

[0154] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 15 kHz until it turns pale blue.

[0155] Aminopropyltriethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 500 rpm for 10 min to obtain a fluid with shear-thinning properties.

[0156] The fluid was cooled to 10°C in an ice bath, and end-capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 100 rpm for 20 minutes until homogeneous to obtain the liquid component.

[0157] 2. Preparation of powder components

[0158] Weigh out the following components by mass ratio: 36 parts slag powder, 40 parts coal gangue powder, 1.2 parts nano-SiO2-Al2O3 composite, 5 parts calcium sulfoaluminate, 6 parts gypsum, 0.7 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 1.5 parts hydroxypropyl methylcellulose.

[0159] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80℃ and 1000rpm for 20min to obtain mixture A;

[0160] Mixture A, slag powder, coal gangue powder, calcium sulfoaluminate, gypsum and sodium polyacrylate are mixed and stirred at 50 rpm for 15 min to obtain mixture B; micron-sized glass beads are added to mixture B and stirred at 50 rpm for 30 min to obtain the powder component.

[0161] 3. Implementation process

[0162] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0163] Example 8

[0164] 1. Preparation of liquid components

[0165] Weigh out the following components by weight: 58.0 parts deionized water, 7.0 parts aminopropyltriethoxysilane, 5.0 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 15.0 parts end-capped isocyanate prepolymer microcapsules, 2.0 parts polyethylene glycol monomethyl ether, 3.0 parts methyl allyl polyoxyethylene ether, 0.5 parts hydroxypropyl methylcellulose, 9.0 parts triethanolamine, and 1.5 parts tetrasodium EDTA.

[0166] Heat deionized water to 40°C, add triethanolamine to the deionized water and stir until completely dissolved, then add polyethylene glycol monomethyl ether, methyl allyl polyoxyethylene ether and EDTA tetrasodium salt in sequence, and stir until a transparent and homogeneous solution is formed.

[0167] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 15 kHz until it turns pale blue.

[0168] Aminopropyltriethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 500 rpm for 10 min to obtain a fluid with shear-thinning properties.

[0169] The fluid was cooled to 10°C in an ice bath, and end-capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 100 rpm for 20 minutes until homogeneous to obtain the liquid component.

[0170] 2. Preparation of powder components

[0171] Weigh out the following components by mass ratio: 40 parts silica fume, 33 parts fly ash, 0.5 parts nano-SiO2-Al2O3 composite, 2 parts calcium oxide, 10 parts magnesium oxide, 0.8 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 1.7 parts hydroxypropyl methylcellulose.

[0172] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80℃ and 1000rpm for 20min to obtain mixture A;

[0173] Mixture A, silica fume, fly ash, calcium oxide, magnesium oxide and sodium polyacrylate are mixed and stirred at 50 rpm for 15 min to obtain mixture B; micron-sized glass beads are added to mixture B and stirred at 50 rpm for 30 min to obtain the powder component.

[0174] 3. Implementation process

[0175] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0176] Example 9

[0177] 1. Preparation of liquid components

[0178] Weigh out the following components by weight: 62.0 parts deionized water, 12.0 parts aminopropyltriethoxysilane, 9.0 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 7.0 parts end-capped isocyanate prepolymer microcapsules, 1.5 parts polyethylene glycol monomethyl ether, 1.5 parts allyl alcohol polyoxyethylene ether, 0.2 parts hydroxypropyl methylcellulose, 5.0 parts triethanolamine, and 1.8 parts tetrasodium EDTA.

[0179] Heat deionized water to 40°C, add triethanolamine to the deionized water and stir until completely dissolved, then add polyethylene glycol monomethyl ether, allyl alcohol polyoxyethylene ether and EDTA tetrasodium salt in sequence, and stir until a transparent and homogeneous solution is formed.

[0180] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 15 kHz until it turns pale blue.

[0181] Aminopropyltriethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 500 rpm for 10 min to obtain a fluid with shear-thinning properties.

[0182] The fluid was cooled to 10°C in an ice bath, and end-capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 100 rpm for 20 minutes until homogeneous to obtain the liquid component.

[0183] 2. Preparation of powder components

[0184] Weigh out the following components by mass ratio: 35 parts silica fume, 40 parts coal gangue powder, 1.5 parts nano-SiO2-Al2O3 composite, 2 parts calcium oxide, 6 parts gypsum, 0.4 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 2.1 parts hydroxypropyl methylcellulose.

[0185] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80℃ and 1000rpm for 20min to obtain mixture A;

[0186] Mixture A, silica fume, coal gangue powder, calcium oxide, gypsum and sodium polyacrylate are mixed and stirred at 50 rpm for 15 min to obtain mixture B; micron-sized glass beads are added to mixture B and stirred at 50 rpm for 30 min to obtain the powder component.

[0187] 3. Implementation process

[0188] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0189] Example 10

[0190] 1. Preparation of liquid components

[0191] Weigh out the following components by weight: 55.0 parts deionized water, 9.0 parts aminopropyltriethoxysilane, 7.0 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 11.0 parts end-capped isocyanate prepolymer microcapsules, 1.0 part methyl allyl polyoxyethylene ether, 3.0 parts allyl alcohol polyoxyethylene ether, 0.4 parts hydroxypropyl methylcellulose, 8.0 parts triethanolamine, 0.6 parts disodium EDTA, and 1.0 part tetrasodium EDTA.

[0192] Heat deionized water to 40°C, add triethanolamine to the deionized water and stir until completely dissolved, then add methyl allyl polyoxyethylene ether, allyl alcohol polyoxyethylene ether, disodium EDTA and tetrasodium EDTA in sequence, and stir until a transparent and homogeneous solution is formed.

[0193] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 15 kHz until it turns pale blue.

[0194] Aminopropyltriethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 500 rpm for 10 min to obtain a fluid with shear-thinning properties.

[0195] The fluid was cooled to 10°C in an ice bath, and end-capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 100 rpm for 20 minutes until homogeneous to obtain the liquid component.

[0196] 2. Preparation of powder components

[0197] Weigh out the following components by weight: 50 parts fly ash, 22 parts coal gangue powder, 1.0 part nano-SiO2-Al2O3 composite, 5.5 parts magnesium oxide, 5 parts gypsum, 0.6 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 2.5 parts hydroxypropyl methylcellulose.

[0198] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80℃ and 1000rpm for 20min to obtain mixture A;

[0199] Mixture A, fly ash, coal gangue powder, magnesium oxide, gypsum and sodium polyacrylate are mixed and stirred at 50 rpm for 15 min to obtain mixture B; micron-sized glass beads are added to mixture B and stirred at 50 rpm for 30 min to obtain the powder component.

[0200] 3. Implementation process

[0201] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0202] Example 11

[0203] 1. Preparation of liquid components

[0204] Weigh out the following components by weight: 65.0 parts deionized water, 8.0 parts glycidyl etheroxypropyltrimethoxysilane, 6.0 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 9.0 parts end-capped isocyanate prepolymer microcapsules, 1.0 part polyethylene glycol, 1.0 part polyethylene glycol monomethyl ether, 1.5 parts methyl allyl polyoxyethylene ether, 0.3 parts hydroxypropyl methylcellulose, 6.5 parts triethanolamine, 0.5 parts disodium EDTA, and 1.2 parts tetrasodium EDTA.

[0205] Heat deionized water to 40°C, add triethanolamine to the deionized water and stir until completely dissolved, then add polyethylene glycol, polyethylene glycol monomethyl ether, methyl allyl polyoxyethylene ether, disodium EDTA and tetrasodium EDTA in sequence, and stir until a transparent and homogeneous solution is formed.

[0206] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 15 kHz until it turns pale blue.

[0207] Glycidyl etheroxypropyltrimethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 500 rpm for 10 min to obtain a fluid with shear-thinning properties.

[0208] The fluid was cooled to 10°C in an ice bath, and end-capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 100 rpm for 20 minutes until homogeneous to obtain the liquid component.

[0209] 2. Preparation of powder components

[0210] Weigh out the following components by weight: 26 parts slag powder, 25 parts silica fume, 25 parts fly ash, 1.0 part nano-SiO2-Al2O3 composite, 5.5 parts calcium oxide, 4 parts magnesium oxide, 0.5 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 2.0 parts hydroxypropyl methylcellulose.

[0211] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80℃ and 1000rpm for 20min to obtain mixture A;

[0212] Mixture A, slag powder, silica fume, fly ash, calcium oxide, magnesium oxide and sodium polyacrylate are mixed and stirred at 50 rpm for 15 min to obtain mixture B; micron-sized glass microspheres are added to mixture B and stirred at 50 rpm for 30 min to obtain the powder component.

[0213] 3. Implementation process

[0214] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0215] Example 12

[0216] 1. Preparation of liquid components

[0217] Weigh out the following components by weight: 57.0 parts deionized water, 12.0 parts glycidyl etheroxypropyltrimethoxysilane, 5.0 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 13.0 parts end-capped isocyanate prepolymer microcapsules, 1.0 part polyethylene glycol, 1.0 part polyethylene glycol monomethyl ether, 3.0 parts allyl alcohol polyoxyethylene ether, 0.5 parts hydroxypropyl methylcellulose, 7.0 parts triethanolamine, 0.5 parts disodium EDTA, and 0.5 parts tetrasodium EDTA.

[0218] Heat deionized water to 40°C, add triethanolamine to the deionized water and stir until completely dissolved, then add polyethylene glycol, polyethylene glycol monomethyl ether, allyl alcohol polyoxyethylene ether, disodium EDTA and tetrasodium EDTA in sequence, and stir until a transparent and homogeneous solution is formed.

[0219] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 15 kHz until it turns pale blue.

[0220] Glycidyl etheroxypropyltrimethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 500 rpm for 10 min to obtain a fluid with shear-thinning properties.

[0221] The fluid was cooled to 10°C in an ice bath, and end-capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 100 rpm for 20 minutes until homogeneous to obtain the liquid component.

[0222] 2. Preparation of powder components

[0223] Weigh out the following components by weight: 25 parts slag powder, 25 parts silica fume powder, 24.5 parts coal gangue powder, 0.5 parts nano-SiO2-Al2O3 composite, 3 parts calcium sulfoaluminate, 3 parts calcium oxide, 5 parts gypsum, 0.7 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 1.3 parts hydroxypropyl methylcellulose.

[0224] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80℃ and 1000rpm for 20min to obtain mixture A;

[0225] Mixture A, slag powder, silica fume, coal gangue powder, calcium sulfoaluminate, calcium oxide, gypsum, and sodium polyacrylate are mixed and stirred at 50 rpm for 15 min to obtain mixture B; micron-sized glass microspheres are added to mixture B and stirred at 50 rpm for 30 min to obtain the powder component.

[0226] 3. Implementation process

[0227] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0228] Example 13

[0229] 1. Preparation of liquid components

[0230] Weigh out the following components by weight: 63.0 parts deionized water, 7.0 parts glycidyl etheroxypropyltrimethoxysilane, 9.0 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 14.0 parts end-capped isocyanate prepolymer microcapsules, 1.0 part polyethylene glycol monomethyl ether, 1.0 part methyl allyl polyoxyethylene ether, 1.0 part allyl alcohol polyoxyethylene ether, 0.2 parts hydroxypropyl methylcellulose, 8.5 parts triethanolamine, and 1.3 parts tetrasodium EDTA.

[0231] Heat deionized water to 40°C, add triethanolamine to the deionized water and stir until completely dissolved, then add polyethylene glycol monomethyl ether, methyl allyl polyoxyethylene ether, allyl alcohol polyoxyethylene ether and EDTA tetrasodium salt in sequence, and stir until a transparent and homogeneous solution is formed.

[0232] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 15 kHz until it turns pale blue.

[0233] Glycidyl etheroxypropyltrimethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 500 rpm for 10 min to obtain a fluid with shear-thinning properties.

[0234] The fluid was cooled to 10°C in an ice bath, and end-capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 100 rpm for 20 minutes until homogeneous to obtain the liquid component.

[0235] 2. Preparation of powder components

[0236] Weigh out the following components by mass ratio: 25 parts silica fume, 25 parts fly ash, 23.5 parts coal gangue powder, 1.5 parts nano-SiO2-Al2O3 composite, 2.5 parts calcium oxide, 3 parts magnesium oxide, 3 parts gypsum, 0.4 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 2.1 parts hydroxypropyl methylcellulose.

[0237] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80℃ and 1000rpm for 20min to obtain mixture A;

[0238] Mixture A, silica fume, fly ash, coal gangue powder, calcium oxide, magnesium oxide, gypsum, and sodium polyacrylate are mixed and stirred at 50 rpm for 15 min to obtain mixture B; micron-sized glass beads are added to mixture B and stirred at 50 rpm for 30 min to obtain the powder component.

[0239] 3. Implementation process

[0240] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0241] Example 14

[0242] 1. Preparation of liquid components

[0243] Weigh out the following components by weight: 55.0 parts deionized water, 11.0 parts glycidyl etheroxypropyltrimethoxysilane, 8.5 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 10.0 parts end-capped isocyanate prepolymer microcapsules, 1.0 part polyethylene glycol, 1.0 part polyethylene glycol monomethyl ether, 1.0 part methyl allyl polyoxyethylene ether, 1.5 parts allyl alcohol polyoxyethylene ether, 0.35 parts hydroxypropyl methylcellulose, 9.0 parts triethanolamine, 0.65 parts disodium EDTA, and 1.0 part tetrasodium EDTA.

[0244] Heat deionized water to 40°C, add triethanolamine to the deionized water and stir until completely dissolved, then add polyethylene glycol, polyethylene glycol monomethyl ether, methyl allyl polyoxyethylene ether, allyl alcohol polyoxyethylene ether, disodium EDTA and tetrasodium EDTA in sequence, and stir until a transparent and homogeneous solution is formed.

[0245] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 15 kHz until it turns pale blue.

[0246] Glycidyl etheroxypropyltrimethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 500 rpm for 10 min to obtain a fluid with shear-thinning properties.

[0247] The fluid was cooled to 10°C in an ice bath, and end-capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 100 rpm for 20 minutes until homogeneous to obtain the liquid component.

[0248] 2. Preparation of powder components

[0249] Weigh out the following components by weight: 22.5 parts slag powder, 10 parts silica fume powder, 10 parts fly ash, 30 parts coal gangue powder, 1.2 parts nano-SiO2-Al2O3 composite, 3 parts calcium sulfoaluminate, 3 parts calcium oxide, 3 parts magnesium oxide, 3 parts gypsum, 0.8 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 1.5 parts hydroxypropyl methylcellulose.

[0250] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80℃ and 1000rpm for 20min to obtain mixture A;

[0251] Mixture A, slag powder, silica fume, fly ash, coal gangue powder, calcium sulfoaluminate, calcium oxide, magnesium oxide, gypsum, and sodium polyacrylate are mixed and stirred at 50 rpm for 15 min to obtain mixture B; micron-sized glass microspheres are added to mixture B and stirred at 50 rpm for 30 min to obtain the powder component.

[0252] 3. Implementation process

[0253] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0254] Example 15

[0255] 1. Preparation of liquid components

[0256] Weigh out the following components by weight: 65.0 parts deionized water, 8.5 parts glycidyl etheroxypropyltrimethoxysilane, 5.5 parts HEA-PEGDE secondary grafted modified chitosan with a molecular weight of 400, 8.5 parts end-capped isocyanate prepolymer microcapsules, 0.8 parts polyethylene glycol, 0.8 parts polyethylene glycol monomethyl ether, 0.8 parts methyl allyl polyoxyethylene ether, 0.8 parts allyl alcohol polyoxyethylene ether, 0.25 parts hydroxypropyl methylcellulose, 5.5 parts triethanolamine, 0.55 parts disodium EDTA, and 1.0 part tetrasodium EDTA.

[0257] Heat deionized water to 40°C, add triethanolamine to the deionized water and stir until completely dissolved, then add polyethylene glycol, polyethylene glycol monomethyl ether, methyl allyl polyoxyethylene ether, allyl alcohol polyoxyethylene ether, disodium EDTA and tetrasodium EDTA in sequence, and stir until a transparent and homogeneous solution is formed.

[0258] Add 20% by mass of HEA-PEGDE secondary grafted modified chitosan to a homogeneous solution every minute, and then ultrasonically emulsify and disperse the mixture at 15 kHz until it turns pale blue.

[0259] Glycidyl etheroxypropyltrimethoxysilane and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred at 500 rpm for 10 min to obtain a fluid with shear-thinning properties.

[0260] The fluid was cooled to 10°C in an ice bath, and end-capped isocyanate prepolymer microcapsules were introduced into the fluid under negative pressure. The mixture was stirred at 100 rpm for 20 minutes until homogeneous to obtain the liquid component.

[0261] 2. Preparation of powder components

[0262] Weigh out the following components by mass ratio: 56 parts slag powder, 19.6 parts silica fume powder, 0.7 parts nano-SiO2-Al2O3 composite, 4 parts calcium sulfoaluminate, 4 parts magnesium oxide, 0.5 parts sodium polyacrylate, 12 parts micron-sized glass microspheres, and 2.2 parts hydroxypropyl methylcellulose.

[0263] Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed and coated, and stirred at 80℃ and 1000rpm for 20min to obtain mixture A;

[0264] Mixture A, slag powder, silica fume, calcium sulfoaluminate, magnesium oxide, and sodium polyacrylate were mixed and stirred at 50 rpm for 15 min to obtain mixture B; micron-sized glass microspheres were added to mixture B and stirred at 50 rpm for 30 min to obtain the powder component.

[0265] 3. Implementation process

[0266] Weigh 100 parts of dry soil (which needs to pass through a 5mm sieve), 45 parts of water, 6 parts of PO42.5 silicate cement, 0.2 parts of liquid component, and 2 parts of powder component according to the mass ratio, and mix them to prepare a solid-liquid two-component high-fluidity solidified soil.

[0267] The performance of the solid-liquid two-component high-fluidity solidified soils prepared in Examples 1-15 was tested, and the results are shown in Table 1:

[0268] Table 1. Performance test results of solid-liquid two-component high-fluidity solidified soils in Examples 1-15

[0269]

[0270] Based on the performance test results of Examples 1-15, this solid-liquid two-component high-fluidity curing agent system exhibits excellent performance in terms of fluidity and strength development. The initial fluidity generally reaches 200-285 mm, demonstrating good pumpability and self-leveling ability. Simultaneously, the 1-day unconfined compressive strength reaches 0.122-0.197 MPa, and the 7-day strength further increases to 0.271-0.455 MPa. This indicates that while maintaining high fluidity, the system can achieve rapid early strength development and stable later-stage strength growth, effectively solving the common problems of rapid fluidity decay and low early strength in fluidized solidified soils.

[0271] The above are merely preferred embodiments of the present invention and are not intended to limit the present 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. A solid-liquid two-component high-fluidity soil stabilizer, characterized in that, The raw materials for preparing the solid-liquid two-component high-fluidity soil stabilizer include 1 part liquid component and 10 parts powder component by mass ratio; The liquid components, by mass percentage, include 55-65 parts deionized water, 7.0-12 parts dispersant, 5.0-9.0 parts binder stabilizer, 7.0-15.0 parts end-capped isocyanate prepolymer microcapsules, 3.0-5.0 parts shrinkage reducer, 0.2-0.5 parts hydroxypropyl methylcellulose, 5.0-9.0 parts triethanolamine, and 1.0-2.0 parts disodium EDTA. The powder components, by mass percentage, include 72-76 parts of mineral admixture, 0.5-1.5 parts of nano-SiO2-Al2O3 composite, 8-12 parts of expanding agent, 0.4-0.8 parts of sodium polyacrylate, 12 parts of micron-sized glass microspheres, and 1.5-2.5 parts of hydroxypropyl methylcellulose. The adhesive stabilizer is HEA-PEGDE secondary grafted modified chitosan; the wall material of the end-capped isocyanate prepolymer microcapsules is resin-based, and the core material is a bisulfite-end-capped isocyanate prepolymer; the preparation method of the end-capped isocyanate prepolymer microcapsules is as follows: Aromatic MDI was reacted with polyether polyol under an inert atmosphere to generate terminal-NCO prepolymer, which was then capped with sodium bisulfite at 60-80°C to obtain a capped prepolymer. The capped prepolymer was dispersed in an aqueous phase containing an emulsifier and sheared to form an emulsion. Melamine-formaldehyde prepolymer was then introduced for crosslinking polymerization. Finally, the end-capped isocyanate prepolymer microcapsules were obtained after filtration, washing and drying.

2. The solid-liquid two-component high-fluidity soil stabilizer according to claim 1, characterized in that, The dispersant is aminopropyltriethoxysilane or glycidoxypropyltrimethoxysilane.

3. The solid-liquid two-component high-fluidity soil stabilizer according to claim 1, characterized in that, The shrinkage reducing agent includes one or more of polyethylene glycol, polyethylene glycol monomethyl ether, methyl allyl polyoxyethylene ether, and allyl alcohol polyoxyethylene ether.

4. The solid-liquid two-component high-fluidity soil stabilizer according to claim 1, characterized in that, The mineral admixture includes one or more of the following: slag powder, silica fume, fly ash, and coal gangue powder.

5. The solid-liquid two-component high-fluidity soil stabilizer according to claim 4, characterized in that, When the mineral admixture is a mixture of slag powder and silica fume, the mass ratio of slag powder to silica fume is 20:(4~7).

6. The solid-liquid two-component high-fluidity soil stabilizer according to claim 1, characterized in that, The expanding agent includes one or more of calcium sulfoaluminate, calcium oxide, magnesium oxide, and gypsum.

7. The solid-liquid two-component high-fluidity soil stabilizer according to claim 6, characterized in that, When the expanding agent is a mixture of calcium sulfoaluminate and magnesium oxide, the mass ratio of calcium sulfoaluminate to magnesium oxide is (1~2):

1.

8. A method for preparing a solid-liquid two-component high-fluidity soil stabilizer according to any one of claims 1 to 7, characterized in that, The method for preparing the liquid component includes: Heat deionized water, add triethanolamine to the deionized water and stir until completely dissolved, then add shrinkage reducing agent and disodium EDTA in sequence and stir until a homogeneous solution is formed; A binder stabilizer is added dropwise to the homogeneous solution, followed by ultrasonic emulsification and dispersion. A dispersant and hydroxypropyl methylcellulose were added sequentially to the ultrasonically emulsified and dispersed solution, and the mixture was stirred to obtain a fluid with shear-thinning properties. The fluid is cooled down, and end-capped isocyanate prepolymer microcapsules are introduced into the fluid under negative pressure. The mixture is stirred and mixed evenly to obtain the liquid component. The preparation method of the powder component includes: Hydroxypropyl methylcellulose and nano-SiO2-Al2O3 composite were mixed, heated and stirred to obtain mixture A; Mixture A, mineral admixtures, expanding agent and sodium polyacrylate are mixed and stirred to obtain mixture B; Micron-sized glass beads were added to the mixture B, and the powder component was obtained after stirring.

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