Green low-carbon high-performance fluid-state curing material and preparation method thereof

Abstract

The invention discloses a green low-carbon high-performance fluid-state curing material and a preparation method thereof. The flow-state curing material is prepared from modified recycled aggregate, an industrial waste residue curing agent, a composite rheological stabilizer, a defoaming agent, a water reducing agent and water according to a specific ratio. The recycled aggregate is subjected to comprehensive modification through the processes of hot air vortex cleaning and activation, vacuum-microwave synergistic impregnation, microorganism-chemical synergistic mineralization, surface silicon-based functional layer coating and the like; the carbide slag, the slag, the fly ash and the desulfurized gypsum are compounded to form an efficient cementing material; the composite rheological stabilizer with a gradient cross-linked structure is introduced, so that the rheological property of the material is accurately regulated and controlled. According to the invention, high-value utilization of the construction waste and the industrial waste residue is realized, the prepared flow-state curing material has excellent fluidity, relatively high compressive strength and relatively low drying shrinkage rate, the production process is green and low-carbon, and the flow-state curing material is suitable for the engineering fields of road base backfill, pipeline groove backfill, backfill of the back side of a retaining wall and the like.

Description

Technical Field

[0001] This invention relates to the field of solid waste building material utilization technology, and in particular to a green, low-carbon, high-performance fluidized solidified material and its preparation method. Background Technology

[0002] In recent years, the resource utilization of construction waste has become an important issue concerning sustainable development. Recycled aggregate, as a major product of construction waste recycling, has attracted much attention due to its wide availability and low cost. However, recycled aggregate has a large amount of cement mortar adhering to its surface and numerous micro-cracks inside, resulting in inherent defects such as high porosity, high water absorption, high crushing index, and weak interfacial bonding with cementitious materials. Fluidized solidified materials prepared directly from recycled aggregate often suffer from rapid loss of workability, low strength, and poor volume stability, severely restricting their application in high-performance engineering projects.

[0003] The stockpiling of waste residues such as calcium carbide slag, mineral slag, and desulfurization gypsum not only occupies a large amount of land but also poses environmental risks. How to efficiently and effectively utilize these industrial waste residues is a pressing problem that needs to be solved. Traditionally, some of these waste residues are often used as cement admixtures, but the dosage is limited and has an adverse effect on the early properties and rheological properties of the materials.

[0004] Existing fluidized bed materials mostly use natural aggregates and ordinary silicate cement as the main raw materials, which has problems such as high carbon emissions, high cost, and consumption of natural resources. Although some studies have attempted to incorporate recycled aggregates or some industrial waste, the following technical bottlenecks are still faced: 1) The modification technology of recycled aggregates is limited, mostly using physical strengthening or simple chemical slurry soaking, which makes it difficult to achieve synergistic repair from the surface to the interior and from cleaning to reinforcement; 2) The activation efficiency of industrial waste is low, resulting in slow early strength development of the material, which cannot meet the construction schedule requirements; 3) The rheological properties of the material (including fluidity, stability, and anti-segregation) are difficult to control, especially when using high water absorption aggregates and porous waste, the workability of the slurry is easily lost, and the surface is prone to cracking after curing, resulting in a large number of cracks, which affects its mechanical and durability properties.

[0005] Therefore, developing a high-performance, low-environmental-impact fluidized solidification material that can synergistically address the improvement of recycled aggregate performance, efficient cementation of industrial waste residue, and precise control of rheological properties has significant economic, social, and environmental benefits. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a green, low-carbon, high-performance fluidized solidified material. This material uses deeply modified recycled aggregate as the skeleton and multi-component composite industrial waste residue as the main cementing component. The rheological properties are controlled by a unique composite rheology stabilizer, and finally an engineering backfill material with excellent fluidity, rapid strength development, volume stability and environmental friendliness is obtained.

[0007] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is to provide a green, low-carbon, high-performance fluidized solidification material, which, by weight, comprises the following components:

[0008] 80-100 parts of modified recycled aggregate;

[0009] 15-25 parts of industrial waste solidification agent;

[0010] 0.05-0.2 parts of composite rheology stabilizer;

[0011] Defoamer 0.05-0.1 parts;

[0012] Water-reducing agent: 0.1-0.3 parts;

[0013] 30-45 parts water;

[0014] The industrial waste solidification agent is composed of carbide slag, blast furnace slag, fly ash and desulfurized gypsum; the modified recycled aggregate is obtained by a comprehensive treatment process of recycled construction waste aggregate through hot air vortex cleaning, vacuum-microwave synergistic impregnation, biochemical mineralization and surface functionalization coating.

[0015] In a preferred embodiment of the present invention, the mass ratio of carbide slag, blast furnace slag, fly ash, and desulfurized gypsum in the industrial waste solidification agent is (2-3):(5-7):(1-2):(0.6-1.2), and its specific surface area is ≥450m² / kg. This ratio can form an optimal "alkaline activation-sulfate activation" synergistic effect, ensuring coordinated development of early and later strength.

[0016] In a preferred embodiment of the present invention, the method for preparing the modified recycled aggregate includes the following steps:

[0017] S1: Hot Air Vortex Cleaning and Activation: Recycled aggregate (particle size 0.1-4.0 mm) is fed into a rotary hot air vortex cleaner and treated for 25-40 minutes under circulating hot air at 180-230℃ and controlled humidity (10-30% RH). Through high-speed collisions, friction, and thermal shock between the recycled aggregates, dust and low-strength old mortar adhering to their surfaces are effectively removed. Simultaneously, thermal stress causes the micro-cracks on the surface of the recycled aggregates to expand moderately, achieving surface cleaning and activation, and providing more reaction interfaces for subsequent processing.

[0018] S2: Vacuum-Microwave Co-impregnation Enhancement: The recycled aggregate treated in S1 is transferred to a vacuum-microwave co-impregnation device, and a vacuum is drawn to below -0.08 MPa. An ethanol-water composite solution containing 0.6-0.9 mol / L calcium acetate (ethanol volume fraction 35-45%) is injected. Subsequently, microwave irradiation at a frequency of 2.45 GHz is applied for 4-6 min. The vacuum environment forces the solution to penetrate deep into the pores of the recycled aggregate, while the thermal and electromagnetic oscillation effects of the microwaves promote the active migration and adsorption of calcium ions into the deeper interior of the recycled aggregate, achieving deep transfer of calcium source.

[0019] S3: Microbial-Chemical Synergistic Controlled Mineralization: The recycled aggregate treated with S2 is soaked in a composite mineralization medium, which consists of a highly active alkali-resistant carbonic anhydrase bacterial solution (OD2). 600 The mixture consists of 1.2-1.5 mol / L calcium acetate and a 0.25-0.35 mol / L calcium acetate solution. Under constant temperature conditions of 35-40℃, CO2 gas with a concentration of 25±3% is continuously introduced, and simultaneously, micro-nano-sized bubble clusters (particle size 50-200 μm) are injected using a microbubble generator for 12-18 h. Carbonic anhydrase produced by carbonic anhydrase bacteria greatly accelerates the hydration of CO2 to generate carbonate ions, while the microbubbles provide a large reaction interface. Carbonate ions react with adsorbed calcium ions in the cracks and pores within the recycled aggregate, generating an in-situ nano-calcium carbonate network with bridging and filling functions, thus achieving internal reinforcement.

[0020] S4: Surface Silicon-Based Functional Layer Coating: The mineralized recycled aggregate is lightly dehydrated to a moisture content of 16-20% and placed in a high-speed cyclone spray coating machine. While the recycled aggregate remains suspended and dispersed, a composite functional liquid composed of nano-silica sol (particle size 10-25nm) and sodium metasilicate is uniformly sprayed. Through wetting, adsorption, and cross-linking, a continuous, dense, and silanol-rich active functional layer is constructed on the outer surface of the recycled aggregate. This layer can both physically seal surface pores and stabilize the moisture content, and react with calcium ions in the freshly mixed slurry in a pozzolanic reaction, significantly enhancing the interfacial adhesion between the recycled aggregate and the slurry.

[0021] The recycled aggregate prepared by this method has a particle size of 0.1-4.0 mm, a water absorption rate of ≤3%, a crushing value of ≤15%, an open porosity of ≤18%, and a mud content of ≤2%.

[0022] In a preferred embodiment of the present invention, the preparation method of the composite rheology stabilizer includes the following steps:

[0023] P1: Prepare xanthan gum solution with a mass concentration of 0.1% and hydroxypropyl methylcellulose solution respectively, and let them stand at room temperature for 12-24 hours to allow the polymer to fully hydrate and swell;

[0024] P2: Mix the two matured solutions evenly at a volume ratio of 1:(2-3), and disperse them into uniform droplets with a particle size of 100-200 μm using a pressure atomizing device;

[0025] P3: Prepare a calcium citrate solution with a concentration of 0.05-0.15 mol / L, controlling the molar ratio of calcium ions to carboxyl groups on the xanthan gum molecular chain to be 1:4. Disperse the droplets obtained in step P2 uniformly in this calcium citrate solution and stir slowly at 50 rpm for 6 h at 35°C. Calcium ions diffuse from the surface of the droplets inwards, undergoing ionic cross-linking with the carboxyl groups of xanthan gum to form composite gel microparticles.

[0026] P4: The cross-linked gel microparticles were collected and rapidly rinsed with deionized water to remove residual salts from the surface. They were then dehydrated using spray freeze-drying technology to transform them into dry porous microspheres. Finally, the dried microspheres were processed using a vortex jet mill and passed through a 200-mesh sieve to obtain a composite rheology stabilizer powder with a particle size not exceeding 75 μm. This product can be rapidly rehydrated upon contact with water, and its gel network provides excellent shear-thinning properties, water retention, and cohesiveness in slurries.

[0027] In a preferred embodiment of the present invention, the defoamer is a polyether-modified polysiloxane defoamer; the water-reducing agent is a polycarboxylate-based high-performance water-reducing agent with a water reduction rate of not less than 25% and a solid content of 40±2%. This combination can effectively control the air content of the slurry and provide a high water reduction rate with low water consumption, ensuring high fluidity and high density.

[0028] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is: to provide a method for preparing a green, low-carbon, high-performance fluidized solidified material as described in any of the preceding claims, comprising the following steps:

[0029] 1) Prepare modified recycled aggregate and composite rheology stabilizer according to the above method.

[0030] 2) Weigh each component according to the formula weight parts: modified recycled aggregate, industrial waste solidification agent, composite rheology stabilizer, defoamer, water reducing agent and water.

[0031] 3) First, put the modified recycled aggregate, industrial waste solidification agent and composite rheology stabilizer into the mixer and dry mix for 1-2 minutes until uniform.

[0032] 4) Add the pre-mixed water, water-reducing agent and defoamer to the dry mix and stir for 5-10 minutes until a uniform, well-flowing slurry is formed, which is the fluidized solidified material.

[0033] The beneficial effects of this invention are:

[0034] (1) This invention systematically solves the fundamental problems of weak surface, internal cracks and poor interfacial properties of recycled aggregate by comprehensively and synergistically modifying recycled aggregate. The water absorption rate of the modified recycled aggregate is significantly reduced, the crushing value is greatly improved, the internal structure is enhanced, and the interfacial bonding force with the new slurry is strong, laying a solid foundation for the preparation of high-performance fluidized solidified material.

[0035] (2) By utilizing a composite activation system of carbide slag (alkaline activator), blast furnace slag (potential hydraulic agent), fly ash (potential hydraulic agent), and desulfurized gypsum (sulfate activator), the maximum utilization of the activity of waste residue is achieved. This system is rich in hydration products (hydrated calcium silicate gel, ettringite, etc.), with rapid early strength development and continuous strength growth in the later stage. It can completely replace cement and has significant carbon emission reduction benefits.

[0036] (3) The composite rheology stabilizer of the present invention provides initial viscosity to prevent segregation in the early stage of stirring, exhibits excellent shear thinning properties during pumping and casting to ensure its high fluidity, and can quickly restore viscosity after standing to prevent the settling of recycled aggregates, thus realizing precise control of the rheological behavior of slurry in the time and shear force dimensions.

[0037] (4) The prepared fluidized solidified material has high fluidity, good fluidity retention, strong anti-segregation, high early strength, stable later strength development, and excellent shrinkage and durability.

[0038] (5) The raw materials of this invention are mainly solid waste, which realizes the synergistic high-value utilization of construction waste and industrial waste residue, reduces the cost of raw materials and the consumption of natural resources, and has broad market application prospects. Attached Figure Description

[0039] Figure 1 This is a scanning electron microscope image of the green, low-carbon, high-performance fluidized bed curing material described in this invention after curing.

[0040] Figure 2 This is a comparison chart of the 28-day compressive strength of the fluidized solidified materials prepared in Examples 1-3 and Comparative Examples 1-3 of the present invention. Detailed Implementation

[0041] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0042] The embodiments of the present invention include:

[0043] Example 1:

[0044] A method for preparing a green, low-carbon, high-performance fluidized solidified material includes the following steps:

[0045] 1. Preparation of modified recycled aggregate:

[0046] Recycled aggregate with a particle size of 0.1-2.36 mm was obtained by crushing and screening construction waste concrete. The recycled aggregate was found to have a water absorption rate of 16%, a crushing value of 25%, an open porosity of 45%, and a mud content of 1.2%.

[0047] S1: Hot air vortex treatment for 30 minutes at 200℃ and 20% RH.

[0048] S2: Vacuum impregnated in a 40% ethanol solution of 0.8 mol / L calcium acetate, and then irradiated with microwave (2.45 GHz) for 5 min.

[0049] S3: Placed in OD 600 A mixture of carbonic anhydrase bacterial culture with a concentration of 1.2 and 0.3 mol / L calcium acetate was prepared, and 25% CO2 was introduced and microbubbles were injected at 30°C. The reaction was carried out for 12 h.

[0050] S4: Dehydrate to a moisture content of 18%, then spray with a composite solution of 1.5% nano-SiO2 sol (particle size 20nm) and sodium metasilicate (mass ratio 1:0.8).

[0051] Modified recycled aggregate was obtained through the above processing method. Its water absorption rate was measured to be 2.8%, crushing value was 10%, and open porosity was 15%.

[0052] 2. Preparation of composite rheology stabilizers:

[0053] P1: Prepare xanthan gum solution with a mass concentration of 0.1% and hydroxypropyl methylcellulose solution respectively, and let them stand at room temperature for 12-24 hours to allow the polymer to fully hydrate and swell;

[0054] P2: Mix the two matured solutions evenly at a volume ratio of 1:(2-3), and disperse them into uniform droplets with a particle size of 100-200 μm using a pressure atomizing device;

[0055] P3: Prepare a 0.1 mol / L calcium citrate solution, controlling the molar ratio of calcium ions to carboxyl groups on the xanthan gum molecular chain to be 1:4. Disperse the droplets obtained in step P2 uniformly in this calcium citrate solution and stir slowly at 50 rpm for 6 h at 35°C. Calcium ions diffuse from the droplet surface to the interior in a gradient, undergoing ionic cross-linking with the carboxyl groups of xanthan gum to form composite gel microparticles.

[0056] P4: The cross-linked gel microparticles were collected and rapidly rinsed with deionized water to remove residual salts from the surface. They were then dehydrated using spray freeze-drying technology to transform them into dry porous microspheres. Finally, the dried microspheres were processed using a vortex airflow mill and passed through a 200-mesh sieve to obtain a composite rheology stabilizer powder with a particle size not exceeding 75 μm.

[0057] 3. Preparation of fluidized solidified material:

[0058] Formula: 90 parts modified recycled aggregate, 20 parts industrial waste solidification agent (carbide slag: blast furnace slag: fly ash: desulfurized gypsum = 2.5: 6: 1.5: 1), 0.12 parts composite rheology stabilizer, 0.08 parts polyether modified polysiloxane defoamer, 0.15 parts polycarboxylate superplasticizer (water reduction rate 28%), and 35 parts water.

[0059] 4. Preparation: After dry mixing for 1.5 min, add the liquid phase mixture and stir for 10 min.

[0060] The scanning electron microscope image of the cured green, low-carbon, high-performance fluidized bed material is shown below. Figure 1 As shown in the figure, the solidified soil formed a dense microstructure and generated a large amount of hydration products such as hydrated calcium silicate gel and ettringite.

[0061] Example 2:

[0062] 1. Preparation of modified recycled aggregate:

[0063] Recycled aggregate with a particle size of 2.36-4.0 mm was obtained by crushing and screening construction waste concrete. The recycled aggregate was found to have a water absorption rate of 12%, a crushing value of 18%, an open porosity of 32%, and a mud content of 1.2%.

[0064] S1: Treat at 220℃ and 15% RH for 35 min.

[0065] S2: The impregnation solution is a 38% ethanol solution of 0.7 mol / L calcium acetate, and the solution is microwave irradiated for 4.5 min.

[0066] S3: Bacterial liquid OD 600 =1.4, calcium acetate concentration 0.28 mol / L, CO2 concentration 25%, reaction time 16 h.

[0067] S4: Dehydrate to a moisture content of 18%, then spray with a 2.0% composite functional liquid (nano SiO2 to sodium metasilicate mass ratio 1:1).

[0068] Modified recycled aggregate was obtained through the above processing method. Its water absorption rate was measured to be 2.0%, crushing value was 8.5%, and open porosity was 12%.

[0069] 2. Preparation of composite rheology stabilizers:

[0070] The concentration of calcium citrate solution used for crosslinking was 0.12 mol / L, and the rest was the same as in Example 1.

[0071] 3. Preparation of fluidized solidified material:

[0072] Formula: 85 parts modified recycled aggregate, 18 parts industrial waste solidification agent (mass ratio 3:6.5:1.0:0.8), 0.15 parts composite rheology stabilizer, 0.06 parts defoamer, 0.25 parts water-reducing agent, and 32 parts water.

[0073] 4. The preparation method is the same as in Example 1.

[0074] Example 3:

[0075] 1. Preparation of modified recycled aggregate:

[0076] Waste concrete from construction was crushed and screened to obtain recycled aggregate with a particle size of 0.1-4.0 mm. The recycled aggregate was found to have a water absorption rate of 14%, a crushing value of 22%, an open porosity of 40%, and a mud content of 1.2%.

[0077] S1: Treat at 190℃ and 25% RH for 28 min.

[0078] S2: The impregnation solution is a 45% ethanol solution of 0.9 mol / L calcium acetate, and the solution is microwave irradiated for 5.5 min.

[0079] S3: Bacterial liquid OD 600 =1.2, calcium acetate concentration 0.35 mol / L, CO2 concentration 28%, reaction time 16 h.

[0080] S4: Dehydrate to a moisture content of 18%, then spray with a 1.0% amount of composite functional liquid.

[0081] Modified recycled aggregate was obtained through the above processing method. Its water absorption rate was measured to be 2.5%, crushing value was 9%, and open porosity was 14%.

[0082] 2. Preparation of composite rheology stabilizers:

[0083] The volume ratio of xanthan gum to hydroxypropyl methylcellulose solution was 1:2.5, and the rest was the same as in Example 1.

[0084] 3. Preparation of fluidized solidified material:

[0085] Formula: 85 parts modified recycled aggregate, 22 parts industrial waste solidifying agent (mass ratio 2:7:1:1.2), 0.08 parts composite rheology stabilizer, 0.1 parts defoamer, 0.15 parts water-reducing agent, and 38 parts water.

[0086] 4. The preparation method is the same as in Example 1.

[0087] Comparative Example 1:

[0088] The unmodified recycled aggregate from Example 1 was used to directly replace the modified recycled aggregate from Example 1, with the remaining components and preparation process being exactly the same.

[0089] Comparative Example 2:

[0090] Instead of adding a composite rheology stabilizer, an equal mass of ordinary hydroxypropyl methylcellulose was added, and the remaining components and preparation process were the same as in Example 1.

[0091] Comparative Example 3:

[0092] The industrial waste solidifying agent was replaced with ordinary 42.5 grade silicate cement, with the same dosage, and the remaining components and preparation process were the same as in Example 1.

[0093] The performance of the fluidized solidified materials prepared in Examples 1-3 and Comparative Examples 1-3 was tested, and the results are shown in the table below:

[0094] Results analysis:

[0095] Compared with Comparative Example 1, the performance of Examples 1-3 was significantly improved, especially the strength increased by a factor of two and the shrinkage rate was greatly reduced, which proves the excellent effect of the aggregate modification technology of the present invention.

[0096] Compared with Comparative Example 2, Examples 1-3 showed significant advantages in terms of flowability and resistance to water separation, indicating that the composite rheology stabilizer has better rheological regulation capabilities than hydroxypropyl methylcellulose alone.

[0097] Compared with Comparative Example 3, combined Figure 2 Although the compressive strength of Examples 1-3 is slightly reduced, their fluidity, resistance to bleeding and segregation, and resistance to drying shrinkage are all superior, indicating that Examples 1-3 have better overall performance. Therefore, under the premise of meeting the strength requirements, this invention achieves the goal of better workability and less drying shrinkage of the fluidized solidified material by completely replacing cement with industrial waste residue solidifying agent, while demonstrating the technical advantages and feasibility of low carbon and environmental protection.

[0098] In summary, the green, low-carbon, high-performance fluidized solidified material and its preparation method provided by this invention can solve key technical problems in the high-value utilization of recycled aggregates and industrial waste. The product has excellent performance, significant environmental benefits, and important value for promotion and application.

[0099] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A green, low-carbon, high-performance fluidized solidification material, characterized in that, By weight, it includes the following components: 80-100 parts of modified recycled aggregate; 15-25 parts of industrial waste solidification agent; 0.05-0.2 parts of composite rheology stabilizer; Defoamer 0.05-0.1 parts; Water-reducing agent: 0.1-0.3 parts; 30-45 parts water; The industrial waste solidification agent is composed of carbide slag, blast furnace slag, fly ash and desulfurized gypsum; the modified recycled aggregate is obtained by a comprehensive treatment process of recycled construction waste aggregate through hot air vortex cleaning, vacuum-microwave synergistic impregnation, biochemical mineralization and surface functionalization coating.

2. The green, low-carbon, high-performance fluidized solidified material according to claim 1, characterized in that, In the industrial waste solidification agent, the mass ratio of carbide slag, blast furnace slag, fly ash and desulfurized gypsum is (2-3):(5-7):(1-2):(0.6-1.2), and its specific surface area is ≥450 m² / kg.

3. The green, low-carbon, high-performance fluidized solidified material according to claim 1, characterized in that, The method for preparing the modified recycled aggregate includes the following steps: S1: Hot air vortex cleaning and activation: The recycled aggregate is treated under circulating hot air at 180-230℃ and controlled humidity conditions. The surface deposits of the recycled aggregate are removed by collision, friction and thermal shock, and the micro-cracks on its surface are activated. S2: Vacuum-microwave synergistic impregnation strengthening: The recycled aggregate treated with S1 is impregnated in an ethanol-water composite solution containing calcium acetate under a vacuum of less than 0.08 MPa, and then subjected to microwave irradiation treatment. S3: Microbial-chemical synergistic controllable mineralization: The recycled aggregate treated with S2 is placed in a composite medium containing alkali-resistant carbonic anhydrase bacteria solution and calcium acetate. CO2 gas is introduced and micro-nano bubbles are injected to generate calcium carbonate in situ inside the recycled aggregate. S4: Surface silicon-based functional layer coating: The recycled aggregate treated by S3 is dehydrated to a moisture content of 16-20%, and then sprayed with a composite functional liquid composed of nano-SiO2 sol and sodium metasilicate in a suspended dispersion state to form a surface functional layer.

4. The green, low-carbon, high-performance fluidized solidified material according to claim 3, characterized in that, In step S2, the concentration of calcium acetate in the ethanol-water composite solution is 0.6-0.9 mol / L, and the volume fraction of ethanol is 35-45%.

5. The green, low-carbon, high-performance fluidized solidified material according to claim 3, characterized in that, In step S3, the concentration of calcium acetate in the composite medium is 0.25-0.35 mol / L, and the OD of the alkali-resistant carbonic anhydrase bacterial solution is... 600 The value is 1.2-1.

5.

6. The green, low-carbon, high-performance fluidized solidified material according to claim 1, characterized in that, The preparation method of the composite rheology stabilizer includes the following steps: P1: Prepare xanthan gum solution with a mass concentration of 0.1% and hydroxypropyl methylcellulose solution respectively, and let them stand for 12-24 hours to mature; P2: Mix the two matured solutions evenly at a volume ratio of 1:(2-3) and atomize them into droplets with a particle size of 100-200 μm; P3: Disperse the droplets in a calcium citrate solution and slowly stir at 25-35°C to carry out gradient diffusion crosslinking to form gel microparticles; P4: Collect the cross-linked gel particles, wash and dry them, then pulverize and sieve them to obtain the powder product.

7. The green, low-carbon, high-performance fluidized solidified material according to claim 6, characterized in that, In step P3, the concentration of the calcium citrate solution is 0.05-0.15 mol / L, and the molar ratio of calcium ions to carboxyl groups in xanthan gum is controlled at 1:4 during the gradient diffusion crosslinking process.

8. The green, low-carbon, high-performance fluidized solidified material according to claim 1, characterized in that, The defoamer is a polyether-modified polysiloxane defoamer.

9. The green, low-carbon, high-performance fluidized solidified material according to claim 1, characterized in that, The water-reducing agent is a polycarboxylate-based high-performance water-reducing agent with a water reduction rate of not less than 25% and a solid content of 40±2%.

10. A method for preparing a green, low-carbon, high-performance fluidized solidified material as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Modified recycled aggregates are prepared using the method described in claims 3 to 5; The composite rheology stabilizer is prepared by the method described in claim 6 or 7; Weigh each component according to the specified ratio, dry mix the modified recycled aggregate, industrial waste solidifying agent and composite rheology stabilizer, then add water, water-reducing agent and defoamer, stir and mix evenly to obtain the fluidized solidified material.

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