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

Abstract

The application discloses a kind of green low-carbon high-performance flow state curing material and preparation method thereof.The flow state curing material is composed of modified recycled aggregate, industrial waste residue curing agent, composite rheological stabilizer, defoaming agent, water reducing agent and water according to specific ratio.The recycled aggregate is comprehensively modified by hot air vortex cleaning activation, vacuum-microwave synergic impregnation, microorganism-chemical synergic mineralization and surface silicon-based functional layer coating process;Efficient cementing material is formed by calcium carbide slag, slag, fly ash and desulfurization gypsum compounding;The composite rheological stabilizer with gradient crosslinking structure is introduced to realize the precise control of material rheological property.The application realizes the high-value utilization of construction waste and industrial waste residue, and the prepared flow state curing material has excellent fluidity, higher compressive strength and lower drying shrinkage, and the production process is green and low-carbon, suitable for road base backfill, pipeline trench backfill, retaining wall backfill and other engineering fields.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid waste building material utilization, in particular to a green low-carbon high-performance flowable solidified material and a preparation method thereof. BACKGROUND

[0002] In recent years, the resource utilization of construction waste has become an important issue related to sustainable development. Recycled aggregate, as the main product of construction waste resource utilization, has attracted much attention due to its wide source and low cost. However, the surface of recycled aggregate is attached with a large amount of cement mortar, and there are a large number of microcracks inside, which leads to inherent defects such as high porosity, high water absorption, high crushing index, and weak interfacial adhesion with cementitious materials. The flowable solidified material prepared directly using recycled aggregate often has problems such as fast loss of workability, low strength, and poor volume stability, which seriously restricts its application in high-performance engineering.

[0003] The stockpiling of industrial waste such as calcium carbide slag, slag, and desulfurization gypsum not only occupies a large amount of land, but also poses an environmental risk. How to efficiently and highly value these industrial waste is a difficult problem that needs to be solved. Traditionally, part of the waste is used as a cement admixture, but the amount is limited, and it has an adverse effect on the early performance and rheological properties of the material.

[0004] Existing flowable solidified materials mostly use natural aggregate and ordinary Portland cement as the main raw material, which has the problems of high carbon emission, high cost, and consumption of natural resources. Although some studies have tried to mix recycled aggregate or part of industrial waste, there are still the following technical bottlenecks: 1) the modification technology of recycled aggregate is single, mostly using physical strengthening or simple chemical slurry immersion, which is difficult to achieve the coordinated repair from the surface to the inside and from clean to enhancement; 2) the activity of industrial waste is low, which leads to slow development of early strength of the material, and cannot meet the construction progress requirements; 3) the rheological properties (including fluidity, stability, and segregation resistance) of the material are difficult to control, especially when high water absorption aggregate and porous waste are used, the workability of the slurry is easily lost, and the surface is prone to cracking after solidification, resulting in a large number of cracks, which affects the mechanical and durability properties.

[0005] Therefore, it is of great economic, social, and environmental benefit to develop a high-performance, low environmental load flowable solidified material that can simultaneously solve the performance improvement of recycled aggregate, efficient cementation of industrial waste, and precise control of rheological properties. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a green low-carbon high-performance flowable solidified material, which uses deeply modified recycled aggregate as the framework, uses multi-component industrial waste as the main cementitious component, and uses a unique composite rheological stabilizer to control the rheological properties, finally obtaining an engineering backfill material with excellent fluidity, fast strength development, volume stability, and environmental friendliness.

[0007] To solve the above technical problems, one technical scheme adopted by the present application is to provide a green low-carbon high-performance flow state curing material, which comprises the following components in parts by weight:

[0008] Modified recycled aggregate 80-100 parts;

[0009] Industrial waste residue curing agent 15-25 parts;

[0010] Composite rheological stabilizer 0.05-0.2 parts;

[0011] Defoaming agent 0.05-0.1 parts;

[0012] Water reducing agent 0.1-0.3 parts;

[0013] Water 30-45 parts;

[0014] Among them, the industrial waste residue curing agent is composed of carbide slag, slag, fly ash and desulfurization gypsum; the modified recycled aggregate is obtained by hot air vortex cleaning, vacuum-microwave synergistic impregnation, biochemical mineralization and surface functionalization coating comprehensive treatment process of construction waste recycled aggregate.

[0015] In a preferred embodiment of the present application, in the industrial waste residue curing agent, the mass ratio of carbide slag, slag, fly ash and desulfurization gypsum is (2-3):(5-7):(1-2):(0.6-1.2), and the specific surface area is ≥450 m² / kg. The above-mentioned ratio can form the optimal "alkali activation-sulfate activation" synergistic effect, and ensure the coordinated development of early and late strength.

[0016] In a preferred embodiment of the present application, the preparation method of the modified recycled aggregate comprises the following steps:

[0017] S1: Hot air vortex cleaning and activation: the recycled aggregate (particle size 0.1-4.0 mm) is put into a rotary hot air vortex cleaning machine, and is treated under the condition of 180-230℃ circulating hot air and controllable humidity (10-30% RH) for 25-40 min. Through high-speed collision, friction and thermal shock between the recycled aggregates, the dust and low-strength old mortar attached to the surface of the recycled aggregate are effectively stripped. At the same time, the thermal stress makes the surface layer microcracks of the recycled aggregate moderately expand, realizing the cleaning and activation of the surface, and providing more reaction interfaces for subsequent treatment.

[0018] S2: Vacuum-microwave synergistic impregnation: The recycled aggregate treated in S1 is transferred to a vacuum-microwave synergistic impregnation device, vacuumed to below -0.08 MPa, and injected with an ethanol-water composite solution containing 0.6-0.9 mol / L calcium acetate (35-45% ethanol by volume). Then microwave irradiation at a frequency of 2.45 GHz is applied for 4-6 min. The vacuum environment forces the solution to penetrate into the recycled aggregate pores, and the heat effect and electromagnetic oscillation effect of the microwave promote the active migration and adsorption of calcium ions to deeper parts of the recycled aggregate, achieving deep delivery of calcium source.

[0019] S3: Microbial-chemical synergistic controllable mineralization: The recycled aggregate treated in S2 is soaked in a composite mineralization medium composed of high-activity alkali-resistant carbonic anhydrase bacterial solution (OD 600 =1.2-1.5) and 0.25-0.35 mol / L calcium acetate solution. At a constant temperature of 35-40°C, 25±3% CO2 gas is continuously introduced, and micro-nano bubbles (particle size 50-200 μm) are injected simultaneously by a micro-bubble generator, and the reaction is carried out for 12-18 h. The carbonic anhydrase produced by the carbonic anhydrase bacteria greatly accelerates the hydration of CO2 to generate carbonate ions, and the micro-bubbles provide a large reaction interface. The carbonate ions react with the adsorbed calcium ions in the internal cracks and pores of the recycled aggregate to in-situ generate a nano-calcium carbonate network with bridging and filling effects, achieving internal reinforcement.

[0020] S4: Surface silicon-based functional layer coating: The mineralized recycled aggregate is lightly dehydrated to a water content of 16-20%, and placed in a high-speed cyclone spray coating machine. While the recycled aggregate is kept in a suspended and dispersed state, a composite functional liquid composed of nano-silica sol (particle size 10-25 nm) and sodium metasilicate is uniformly sprayed. Through wetting, adsorption and cross-linking, a continuous, dense and silicon-hydroxyl-rich active functional layer is constructed on the outer surface of the recycled aggregate. This layer not only physically seals the surface pores and stabilizes the water content, but also reacts with calcium ions in the freshly mixed paste to significantly enhance the interfacial bonding between the recycled aggregate and the paste.

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

[0022] In a preferred embodiment of the present application, the preparation method of the composite rheological stabilizer comprises the following steps:

[0023] P1: Prepare 0.1% xanthan gum solution and 0.5% hydroxypropyl methylcellulose solution, respectively, and let them stand at room temperature for 12-24 hours to fully hydrate and swell the polymers;

[0024] P2: The two solutions after maturation are mixed uniformly in a volume ratio of 1: (2-3), and are dispersed into uniform droplets with a particle size of 100-200 μm by a pressure atomizing device;

[0025] P3: A calcium citrate solution with a concentration of 0.05-0.15 mol / L is prepared, and the molar ratio of calcium ions to carboxyl groups on the xanthan gum molecular chain in the solution is controlled to be 1:4. The droplets obtained in step P2 are uniformly dispersed in the calcium citrate solution, and are slowly stirred at 35°C at a speed of 50 rpm for 6 h. The calcium ions are gradiently diffused from the surface to the inside of the droplets, and ion crosslinking occurs with the carboxyl groups of the xanthan gum, forming composite gel micro-particles;

[0026] P4: The gel micro-particles after crosslinking are collected, and residual salt on the surface is removed by rapid rinsing with deionized water. Subsequently, the gel micro-particles are dehydrated into dry porous microspheres by using a spray freeze-drying technology. Finally, the dry microspheres are treated by a vortex airflow pulverizer, and are sieved through a 200-mesh screen, to obtain a composite rheological stabilizer powder with a particle size of not more than 75 μm. The product can be quickly rehydrated after being contacted with water, and the gel network thereof provides excellent shear thinning, water retention, and cohesiveness in the slurry.

[0027] In a preferred embodiment of the present application, the defoaming agent is a polyether-modified polysiloxane defoaming agent; and the water reducing agent is a polycarboxylic acid-based high-performance water reducing agent, with a water reducing rate of not less than 25% and a solid content of 40±2%. The combination can effectively control the air content of the slurry, and provide high water reducing rate under low water consumption, to ensure high fluidity and high density.

[0028] To solve the above technical problems, the present application employs another technical solution, which provides a preparation method of the green low-carbon high-performance flow-state curing material as described in any one of the above, comprising the following steps:

[0029] 1) The modified recycled aggregate and the composite rheological stabilizer are prepared according to the above method.

[0030] 2) The components are weighed according to the formula: the modified recycled aggregate, the industrial waste residue curing agent, the composite rheological stabilizer, the defoaming agent, the water reducing agent, and water.

[0031] 3) The modified recycled aggregate, the industrial waste residue curing agent, and the composite rheological stabilizer are first put into a mixer, and are dry-mixed for 1-2 min until uniform.

[0032] 4) The water, the water reducing agent, and the defoaming agent are pre-mixed and then added to the dry-mixed material, and are stirred for 5-10 min until a uniform slurry with good fluidity is formed, to obtain the flow-state curing material.

[0033] The present application has the following beneficial effects:

[0034] (1) The present application solves the fundamental problems of weak surface layer, internal cracks and poor interface performance of recycled aggregate by comprehensive and synergistic modification of recycled aggregate. The water absorption of the modified recycled aggregate is significantly reduced, the crushing value is greatly improved, and the internal structure is enhanced, which lays a solid foundation for the preparation of high-performance flow state solidified material.

[0035] (2) The composite activation system of calcium carbide slag (alkaline activator), slag (potential hydraulicity), fly ash (potential hydraulicity) and desulfurization gypsum (sulfate activator) is used to maximize the utilization of waste slag. The system has rich hydration products (hydrated calcium silicate gel, ettringite, etc.), fast early strength development and continuous growth of late strength, and can completely replace cement, with significant carbon emission reduction benefit.

[0036] (3) The composite rheological stabilizer of the present application provides initial viscosity to prevent segregation at the beginning of stirring, shows excellent shear thinning property during pumping and pouring to ensure high fluidity, and quickly restores viscosity to prevent recycled aggregate from settling after standing, achieving precise control of the rheological behavior of the slurry in time and shear force dimensions.

[0037] (4) The prepared flow state solidified material has large fluidity, good flowability retention, strong segregation resistance, high early strength, stable late strength development, small dry shrinkage and excellent durability.

[0038] (5) The raw materials of the present application are mainly solid waste, which realizes the synergistic high-value utilization of construction waste and industrial waste slag, reduces the cost of raw materials and the consumption of natural resources, and has broad market application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is the scanning electron microscope image of the green low-carbon high-performance flow state solidified material solidified by the present application;

[0040] Figure 2 is a 28d compressive strength comparison chart of the flow state solidified material prepared by the present application examples 1-3 and comparative examples 1-3. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application can be more clearly defined.

[0042] The embodiments of the present application include:

[0043] Embodiment 1:

[0044] A preparation method of a green low-carbon high-performance flow state solidified material, comprising the following steps:

[0045] 1. Preparation of modified recycled aggregate:

[0046] The recycled aggregate with particle size of 0.1-2.36 mm was obtained by crushing and screening the construction waste concrete. The water absorption of the recycled aggregate was 16%, the crushing value was 25%, the open porosity was 45%, and the clay content was 1.2%.

[0047] S1: hot air vortex treatment at 200°C, 20% RH for 30 min.

[0048] S2: vacuum impregnation in 0.8 mol / L calcium acetate solution in 40% ethanol for 5 min under microwave (2.45 GHz) irradiation.

[0049] S3: placed in OD 600 =1.2 of carbonic anhydrase bacterial solution mixed with 0.3 mol / L calcium acetate medium, 25% CO2 was introduced and micro-bubbles were injected at 30°C for 12 h.

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

[0051] The modified recycled aggregate was obtained by the above treatment method, and the water absorption was 2.8%, the crushing value was 10%, and the open porosity was 15%.

[0052] 2. Preparation of composite rheological stabilizer:

[0053] P1: prepare xanthan gum solution with a mass concentration of 0.1% and hydroxypropyl methylcellulose solution with a mass concentration of 0.5%, respectively, and stand for 12-24 hours at room temperature to allow the polymers to fully hydrate and swell;

[0054] P2: mix the two solutions after standing in a volume ratio of 1:(2-3) uniformly, and disperse them into uniform droplets with a particle size of 100-200 μm through a pressure type atomizing device;

[0055] P3: prepare a calcium citrate solution with a concentration of 0.1 mol / L, and control the molar ratio of calcium ions to carboxyl groups on the xanthan gum molecular chain in the solution to be 1:4. Disperse the droplets obtained in step P2 uniformly in the calcium citrate solution, and slowly stir at 35°C at a speed of 50 rpm for 6 h. The calcium ions diffuse from the surface to the inside of the droplets in a gradient, and ion cross-linking occurs with the carboxyl groups of the xanthan gum, forming composite gel particles;

[0056] P4: Collect the crosslinked gel particles, quickly rinse with deionized water to remove surface residual salt, and then use spray freeze-drying technology to dehydrate and convert them into dry porous microspheres. Finally, the dry microspheres are treated by a vortex airflow crusher, and sieved through a 200 mesh sieve to obtain a composite rheological stabilizer powder with a particle size not greater than 75 μm.

[0057] 3. Flowable solidification material preparation:

[0058] Formulation: modified recycled aggregate 90 parts, industrial waste residue solidification agent (carbide slag: slag: fly ash: desulfurization gypsum = 2.5:6:1.5:1) 20 parts, composite rheological stabilizer 0.12 parts, polyether modified polysiloxane defoaming agent 0.08 parts, polycarboxylic acid water reducer (water reducing rate 28%) 0.15 parts, water 35 parts.

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

[0060] The scanning electron microscope image of the green low-carbon high-performance flowable solidification material after solidification is shown in Figure 1 As can be seen from the figure, the solidified soil forms a dense microstructure, generating a large amount of hydrated calcium silicate gel, ettringite and other hydration products.

[0061] Example 2:

[0062] 1. Preparation of modified recycled aggregate:

[0063] Take the recycled aggregate with a particle size of 2.36-4.0 mm obtained by crushing and sieving of construction waste concrete. It is determined that the water absorption of the recycled aggregate is 12%, the crushing value is 18%, the open porosity is 32%, and the clay content is 1.2%.

[0064] S1: Treat at 220°C, 15% RH for 35 min.

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

[0066] S3: Bacterial solution 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%, and spray 2.0% of a composite functional liquid (mass ratio of nano-SiO2 to sodium metasilicate 1:1).

[0068] The modified recycled aggregate is obtained by the above treatment method, and the water absorption is measured to be 2.0%, the crushing value is 8.5%, and the open porosity is 12%.

[0069] 2. Preparation of the composite rheological stabilizer:

[0070] The concentration of the 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 the fluidized solidification material:

[0072] Formulation: modified recycled aggregate 85 parts, industrial waste residue solidification agent (mass ratio 3:6.5:1.0:0.8) 18 parts, composite rheological stabilizer 0.15 parts, defoaming agent 0.06 parts, water reducing agent 0.25 parts, water 32 parts.

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

[0074] Example 3:

[0075] 1. Preparation of the modified recycled aggregate:

[0076] Take the recycled aggregate with a particle size of 0.1-4.0 mm obtained by crushing and sieving the construction waste concrete. It is determined that the water absorption of the recycled aggregate is 14%, the crushing value is 22%, the open porosity is 40%, and the clay content is 1.2%.

[0077] S1: treatment at 190°C, 25% RH for 28 min.

[0078] S2: the immersion liquid is a 45% ethanol solution of 0.9 mol / L calcium acetate, and the microwave irradiation is 5.5 min.

[0079] S3: the OD of the bacterial solution 600 =1.2, the concentration of calcium acetate is 0.35 mol / L, the concentration of CO2 is 28%, and the reaction time is 16 h.

[0080] S4: dehydration to a moisture content of 18%, and spraying 1.0% of the composite functional liquid.

[0081] The modified recycled aggregate obtained by the above treatment method has a water absorption of 2.5%, a crushing value of 9%, and an open porosity of 14%.

[0082] 2. Preparation of the composite rheological stabilizer:

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

[0084] 3. Preparation of the fluidized solidification material:

[0085] Formulation: modified recycled aggregate 85 parts, industrial waste residue solidification agent (mass ratio 2:7:1:1.2) 22 parts, composite rheological stabilizer 0.08 parts, defoaming agent 0.1 parts, water reducing agent 0.15 parts, water 38 parts.

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

[0087] Comparative Example 1:

[0088] The unmodified recycled aggregate in Example 1 is directly replaced by the modified recycled aggregate in Example 1, and the remaining components and preparation process are completely the same.

[0089] Comparative Example 2:

[0090] Instead of adding a composite rheological stabilizer, an equal amount of ordinary hydroxypropyl methyl cellulose is added, and the remaining components and preparation process are the same as in Example 1.

[0091] Comparative Example 3:

[0092] The industrial waste residue stabilizer is replaced by ordinary 42.5 grade Portland cement with the same dosage, and the remaining components and preparation process are the same as in Example 1.

[0093] The performance of the flowable stabilized material prepared in the above Examples 1-3 and Comparative Examples 1-3 is tested, and the results are shown in the following table:

[0094]

[0095] Result analysis:

[0096] Compared with Comparative Example 1, the performance of Examples 1-3 is significantly improved, especially the strength is doubled, and the shrinkage is greatly reduced, which proves the excellent effect of the aggregate modification technology of the present application.

[0097] Compared with Comparative Example 2, Examples 1-3 have obvious advantages in flowability and anti-seepage segregation, which shows that the composite rheological stabilizer has better rheological control ability than single hydroxypropyl methyl cellulose.

[0098] Compared with Comparative Example 3, combined with Figure 2 , the compressive strength of Examples 1-3 is slightly reduced, but the flowability, anti-seepage segregation and anti-shrinkage performance are more excellent, which shows that Examples 1-3 have better comprehensive performance. Therefore, under the premise of meeting the strength requirement, by using industrial waste residue stabilizer to completely replace cement, the present application realizes the goal of better workability and smaller drying shrinkage of flowable stabilized material, and embodies the technical advantages and feasibility of low carbon and environmental protection.

[0099] In summary, the green low-carbon high-performance flowable stabilized material and its preparation method provided by the present application can solve the key technical problems in the high-value utilization of recycled aggregate and industrial waste residue, the product has excellent performance and significant environmental benefits, and has important popularization and application value.

[0100] The above merely illustrates the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which are made by using the content of the present application specification and drawings, are also included in the patent protection scope of the present application.

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 construction waste recycled aggregate through hot air vortex cleaning, vacuum-microwave synergistic impregnation, biochemical mineralization and surface functionalization coating. 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. 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.

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, 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%.

4. The green, low-carbon, high-performance fluidized solidified material according to claim 1, 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.

5. The green, low-carbon, high-performance fluidized solidified material according to claim 1, 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.

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

7. 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%.

8. A method for preparing a green, low-carbon, high-performance fluidized solidified material as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Modified recycled aggregates are prepared using the method described in claim 1, 3, or 4. The composite rheology stabilizer is prepared by the method described in claim 1 or 5; 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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