Self-driven permeation enhanced grouting material and preparation method thereof

Abstract

The invention provides a self-driven permeation enhanced grouting material and a preparation method thereof. The self-driven permeation enhanced grouting material comprises the following components in parts by mass: 100-120 parts of a self-driven cementing material, 5-8 parts of driving molecules, 1 part of a catalytic promoter, 1-2 parts of a toughening agent and 1-3 parts of a reinforcing agent, wherein the self-driven cementing material comprises Portland cement, polycarboxylic acid molecules containing phosphate groups and catalytic nanoparticles; wherein the mass ratio of the polycarboxylic acid molecules to the catalytic nanoparticles is 1: (3-5); the polycarboxylic acid molecules account for 1.6-2% of the mass of the Portland cement. The grouting material provided by the invention is a self-driven permeation enhanced grouting material, is suitable for loose fine powder coal roadways of coal mines, and solves the problem of'no injection 'in reinforcement of loose and broken powder surrounding rocks of the coal mines.

Description

Technical Field

[0001] This application relates to the field of grouting materials technology, and in particular to a self-driven permeation-enhanced grouting material and its preparation method. Background Technology

[0002] As part of the "support-modification-pressure relief" complete control technology for surrounding rock in coal mine roadways, grouting modification technology can effectively control roadway deformation by forming a reinforced layer, making it an effective way to reinforce the surrounding rock. However, in loose, fine-powdered fractured coal and rock masses, due to the extremely loose rock structure, fine particles, and poorly developed primary fissures, traditional grouting materials are often difficult to inject effectively, and their flow and penetration capabilities are limited, failing to fully penetrate the tiny pores and interparticle gaps within the rock mass. This results in a severely insufficient actual grout intake and a narrow grout diffusion range. The grouting reinforcement effect in related technologies is significantly limited, making it difficult to form a continuous and complete reinforced framework. The integrity and stability of the surrounding rock cannot be effectively improved, seriously affecting the reliability and durability of the support project. The low grout intake, severe grout leakage, and limited reinforcement effect during grouting reinforcement of loose, fine-powdered fractured coal and rock masses are the most significant limiting factors for grouting reinforcement of surrounding rock masses in these masses.

[0003] Therefore, there is an urgent need to develop self-driven permeable reinforced grouting materials suitable for loose, fine-powdered coal roadways in coal mines to solve the problem of "injection failure" in the reinforcement of loose, broken, powdery surrounding rock in coal mines. Summary of the Invention

[0004] This application aims to at least partially solve one of the technical problems in the related art. This application proposes a self-driven permeation-enhanced grouting material and its preparation method. The preparation method is simple, low-cost, and the in-situ polymerization modification with ultra-rapid setting characteristics is suitable for loose and crushed coal roadways in coal mines.

[0005] According to an embodiment of the first aspect of this application, a self-driven penetrating and reinforced grouting material is provided, comprising the following components in parts by weight: 100-120 parts of self-driven cementitious material, 5-8 parts of driving molecules, 1 part of catalytic accelerator, 1-2 parts of toughening agent, and 1-3 parts of reinforcing agent; wherein the self-driven cementitious material comprises silicate cement, phosphate-containing polycarboxylic acid molecules, and catalytic nanoparticles; wherein the mass ratio of the polycarboxylic acid molecules to the catalytic nanoparticles is 1:3-5; and the polycarboxylic acid molecules constitute 1.6-2% of the mass of the silicate cement.

[0006] In some embodiments, the driving molecule comprises carbamide, ammonium bicarbonate and ammonium carbamate in a mass ratio of 1:3:1.

[0007] In some embodiments, the catalytic nanoparticles include ferric oxide nanoparticles and manganese dioxide nanoparticles in a mass ratio of 1:2.

[0008] In some embodiments, the catalyst promoter comprises cobalt hydroxide and cobalt chloride in a mass ratio of 1:1.

[0009] In some embodiments, the toughening agent comprises bis(cyclopentadiene) nickel and nickel acetylacetonate in a mass ratio of 4:1.

[0010] In some embodiments, the reinforcing agent comprises nickel oxide and cobalt oxide in a mass ratio of 1:1.

[0011] According to an embodiment of the second aspect of this application, a method for preparing a self-driven permeation-enhanced grouting material is provided, comprising the following steps: Polycarboxylic acid molecules and catalytic nanoparticles were uniformly mixed according to stoichiometry to obtain a uniform powder. The self-driven cementitious material is obtained by uniformly adsorbing the uniform powder onto the particles of silicate cement according to stoichiometry. The self-driven cementitious material, driving molecule, catalyst promoter, toughening agent and reinforcing agent are uniformly mixed according to stoichiometry to obtain the grouting material described in any embodiment of the first aspect.

[0012] In some embodiments, the polycarboxylic acid molecules and the catalytic nanoparticles are stirred in a dry powder stirrer at 20°C for 30-40 minutes.

[0013] In some embodiments, the uniform powder and the silicate cement are prepared into the self-driven cementitious material in a fluidized bed airflow pulverizer through the mechanochemical action generated by the impact of high-speed airflow and the gas-phase transport-adsorption of fine particles.

[0014] In some embodiments, the self-driven gelling material, the driving molecule, the catalyst promoter, the toughening agent and the reinforcing agent are stirred in a dry powder mixer at 20°C for 15-20 min; And / or, when using the grouting material, water is added and stirred to obtain grouting slurry; the water-cement ratio of the grouting slurry is 0.6-0.8.

[0015] This application describes the preparation of a self-driven cementitious material using silicate cement, phosphate-containing polycarboxylic acid molecules, and catalytic nanoparticles. The driving molecule, catalytic accelerator, reinforcing agent, and toughening agent are then added to the prepared self-driven cementitious material and mixed thoroughly to form a self-driven penetrating and reinforced grouting material. During on-site grouting, the grouting material is mixed with water to obtain the grouting slurry. The hydrophilic long side chains of the phosphate-containing polycarboxylic acid molecules fully extend into the water, forming a polymer molecular brush layer several to tens of nanometers thick around the silicate cement particles. Through hydrogen bonding, a large number of water molecules are bound together, forming a stable solvated water film on the surface of the silicate cement particles. This water film provides excellent lubrication and improves the sliding ability between particles.

[0016] Simultaneously, the catalytic nanoparticles adsorbed on the cementitious material particles in the grout can catalyze the reaction between molecules and water molecules, generating bubbles. The asymmetric jetting of these bubbles produces a "rocket propellant"-like recoil and thrust, propelling the grout front forward, improving grout permeability, expanding the grout diffusion range, and enhancing grouting control. The catalytic nanoparticles in this application possess extremely high specific surface area and surface energy, acting as a "heterogeneous nucleation substrate," providing numerous "nucleation sites" for the precipitation and crystallization of silicate cement hydration products (such as CSH gel and ettringite), accelerating the hydration process. Hydration products are generated earlier and in greater quantities on the nanoparticle surface, shortening the induction period and advancing and increasing the hydration exothermic peak. The abundant distribution of nanocrystal nuclei results in a more uniform distribution and finer size of hydration products, thereby refining the pore structure, reducing porosity, making the hardened grout more dense, improving the strength and toughness of the grouted aggregate, and enhancing the grouting reinforcement effect.

[0017] Ultimately, the preparation method of the self-driven permeation-enhanced grouting material developed in this application is simple and low-cost. The resulting self-driven permeation-enhanced grouting material, due to its in-situ polymerization modification and ultra-fast setting characteristics, is suitable for loose and broken coal roadways in coal mines.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a grouting material preparation method according to one embodiment of this application. Detailed Implementation

[0020] Embodiments of this application are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, this application includes all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0021] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is expected that ranges of 60-110 and 80-120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0022] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0023] To achieve the above objectives, an embodiment of the first aspect of this application provides a self-driven penetrating and reinforcing grouting material comprising the following components in parts by mass: 100-120 parts of self-driven cementitious material, 5-8 parts of driving molecules, 1 part of catalytic accelerator, 1-2 parts of toughening agent, and 1-3 parts of reinforcing agent; wherein the self-driven cementitious material comprises silicate cement, phosphate-containing polycarboxylic acid molecules, and catalytic nanoparticles; wherein the mass ratio of polycarboxylic acid molecules to catalytic nanoparticles is 1:3-5; and the polycarboxylic acid molecules constitute 1.6-2% of the mass of silicate cement.

[0024] In this embodiment, the self-driven permeation-enhanced grouting material includes 100-120 parts of self-driven cementitious material. In some embodiments, the mass fraction of self-driven cementitious material in the grouting material is 100 parts, 105 parts, 110 parts, 115 parts, or 120 parts, etc. The self-driven cementitious material includes silicate cement, phosphate-containing polycarboxylic acid molecules, and catalytic nanoparticles. The mass ratio of polycarboxylic acid molecules to catalytic nanoparticles is 1:3-5. At the same time, the polycarboxylic acid molecules account for 1.6-2% of the mass of silicate cement. In this embodiment, polycarboxylic acid molecules and catalytic nanoparticles are first mixed to promote uniform mixing and obtain a homogeneous powder. The catalytic nanoparticles include ferric oxide nanoparticles and manganese dioxide nanoparticles in a mass ratio of 1:2. Both ferric oxide and manganese dioxide nanoparticles are strong Lewis acids, while the phosphate-containing polycarboxylic acid molecules are Lewis bases. Adsorption occurs through the presence of unsaturated coordinating ions on the surface of the catalytic nanoparticles, where the phosphate groups on the main chain of the phosphate-containing polycarboxylic acid molecules form coordinate bonds with the ions on the surface of the catalytic nanoparticles. Then, physical vapor-phase precipitation is performed through the -COO groups on the main chain... - With the Ca on the particle surface of silicate cement 2+ Positively charged particles are adsorbed onto the surface of silicate cement particles to prepare a self-driven cementitious material, which enables the final grout to achieve self-driven operation and enhanced penetration. In some embodiments, if the amount of self-driven cementitious material is small, such as less than 100 parts, the self-driven power is insufficient and the penetration enhancement effect is weak; if the amount of self-driven cementitious material is large, such as greater than 120 parts, the grouted stone body will produce a large number of pores, and the mechanical strength will be reduced.

[0025] In some embodiments, the self-driven cementitious material includes silicate cement, phosphate-containing polycarboxylic acid molecules, and catalytic nanoparticles, wherein the mass ratio of polycarboxylic acid molecules to catalytic nanoparticles is 1:3-5; for example, the mass ratio of polycarboxylic acid molecules to catalytic nanoparticles is 1:(3, 4, or 5), etc.; for example, if the mass ratio of polycarboxylic acid molecules to catalytic nanoparticles is small, such as less than 1:5, the catalytic nanoparticles have poor dispersibility and agglomerate, resulting in poor catalytic effect; if the mass ratio of polycarboxylic acid molecules to catalytic nanoparticles is large, such as greater than 1:3, self-driving is hindered and the penetration enhancement effect is weak.

[0026] In some embodiments, based on silicate cement, the mass of polycarboxylic acid molecules is 1.6%, 1.7%, 1.8%, 1.9%, or 2% of the mass of silicate cement. For example, if the amount of polycarboxylic acid molecules added is small, such as less than 1.6% of the mass of silicate cement, the hydration effect of silicate cement is poor and the mechanical strength is low; if the amount of polycarboxylic acid molecules added is large, such as less than 1.6% of the mass of silicate cement, the setting speed is slow and the strength is low.

[0027] The self-driven cementitious material of this application has catalytic nanoparticles adsorbed on its surface, possessing extremely high specific surface area and surface energy. These nanoparticles can act as a "heterogeneous nucleation substrate," providing numerous nucleation sites for the precipitation and crystallization of hydration products of silicate cement (such as CSH gel and ettringite), accelerating the hydration process. Hydration products are generated earlier and in greater quantities on the surface of the catalytic nanoparticles, shortening the induction period and causing the hydration exothermic peak to occur earlier and at a higher level. Furthermore, the catalytic nanoparticles can catalyze the reaction between driving molecules and water molecules, generating bubbles. The asymmetric jetting of these bubbles produces a "rocket propellant"-like recoil and thrust, propelling the final grouting slurry front forward, improving the grouting slurry's permeability, expanding its diffusion range, and enhancing grouting control.

[0028] In this embodiment, the self-driven permeation-enhanced grouting material includes 5-8 parts of driving molecules, which are composed of carbamide, ammonium bicarbonate, and ammonium carbamate in a mass ratio of 1:3:1. Their function is to catalytically decompose the driving molecules when placed in the grouting material slurry, generating bubbles and producing a reaction force that promotes the permeation enhancement of microparticles. In some embodiments, the mass fraction of driving molecules in the grouting material is 5, 6, 7, or 8 parts, etc. In some embodiments, if the number of driving molecules is small, such as less than 5 parts, the permeation effect is poor; if the number of driving molecules is large, such as greater than 8 parts, a large number of pores are generated, resulting in low mechanical strength.

[0029] In some embodiments, the self-driven permeation-enhanced grouting material includes 1 part of a catalytic promoter, which includes cobalt hydroxide and cobalt chloride in a mass ratio of 1:1.

[0030] In some embodiments, the self-driven permeation-reinforced grouting material includes 1-2 parts of a toughening agent. The toughening agent comprises bis(cyclopentadiene)nickel and nickel acetylacetonate in a mass ratio of 4:1. Its function is to catalyze the decomposition of driving molecules to generate bubbles, producing a reaction force that promotes the permeation and reinforcement of microparticles. In some embodiments, the toughening agent is 1 or 2 parts. If the amount of toughening agent is small, such as less than 1 part, the grouting material is brittle and easily breaks under impact pressure. If the amount of toughening agent is large, such as more than 2 parts, the mechanical strength of the grouting material decreases, and the reinforcement effect is poor.

[0031] In some embodiments, the self-driven permeation-reinforced grouting material includes 1-3 parts of a reinforcing agent; the reinforcing agent comprises nickel oxide and cobalt oxide in a 1:1 mass ratio, serving as a highly efficient reinforcing agent. Its nanoparticles accelerate hydration through a nucleation effect, generating a denser CSH gel; as micro-aggregates, they fill pores, refine the microstructure, and significantly improve the early strength, later mechanical properties, and durability of the material, making it a key additive for preparing high-performance cement-based composite materials. In some embodiments, the reinforcing agent is 1 part, 2 parts, or 3 parts. If the mass fraction of the reinforcing agent is small, such as less than 1 part, the reinforcing effect of the grouting material is poor, the compressive strength is insufficient, and the reinforcement effect is limited. If the mass fraction of the toughening agent is large, such as greater than 3 parts, the setting time of the grouting material is prolonged, making timely and effective reinforcement difficult.

[0032] In this application, driving molecules, reinforcing agents, and toughening agents are added to a self-driven cementitious material and stirred until homogeneous to prepare a self-driven penetrating reinforced grouting material. When water is added and stirred during on-site grouting, the hydrophilic long side chains of the phosphate-containing polycarboxylic acid molecules fully extend into the water, forming a polymer molecular brush layer several to tens of nanometers thick around the silicate cement particles. This brush layer binds a large number of water molecules through hydrogen bonds, forming a stable solvated water film on the surface of the silicate cement particles. This water film provides excellent lubrication, improves the sliding ability between particles, and enhances the fluidity of the grout.

[0033] In summary, the abundant distribution of nanocrystal nuclei in the grouting material of this application results in a more uniform distribution and smaller size of hydration products during application, thereby refining the pore structure, reducing porosity, making the hardened grout more compact, improving the strength and toughness of the grouted stone body, and enhancing the grouting reinforcement effect.

[0034] According to an embodiment of the second aspect of this application, a method for preparing a self-driven permeation-enhanced grouting material is provided, such as... Figure 1 This includes the following steps: S1: Polycarboxylic acid molecules and catalytic nanoparticles are uniformly mixed according to stoichiometry to obtain a uniform powder; S2: A self-driven cementitious material is obtained by uniformly adsorbing the uniform powder onto the particles of silicate cement according to stoichiometry. S3: The self-driven cementitious material, driving molecule, catalyst promoter, toughening agent and reinforcing agent are uniformly mixed according to stoichiometry to obtain the grouting material in any embodiment of the first aspect.

[0035] Specifically, in step S1, polycarboxylic acid molecules and catalytic nanoparticles are weighed according to their mass proportions and stirred in a dry powder mixer at 20°C for 30-40 minutes to obtain a uniform powder. For example, 100 parts of phosphate-containing polycarboxylic acid molecules and 400 parts of catalytic nanoparticles are weighed according to their mass proportions, added to a dry powder mixer, and stirred at 20°C for 30 minutes to promote uniform mixing and obtain a uniform powder.

[0036] In step S2, uniform powder and silicate cement particles are weighed according to their mass percentages. The uniform powder and silicate cement are then processed in a fluidized bed air jet mill through the mechanochemical action generated by the high-speed airflow impact and the gas-phase transport-adsorption of fine particles to prepare a self-driven cementitious material. For example, 100 parts by mass of ordinary silicate cement and 8 parts by mass of the uniform powder obtained in S1 are weighed and processed under the physical-meteorological sedimentation effect of the fluidized bed air jet mill to prepare a self-driven cementitious material.

[0037] In step S3, 100 parts by weight of the driving cementitious material, 8 parts by weight of the driving molecule, 1 part by weight of the catalyst accelerator, 1-2 parts by weight of the toughening agent, and 1-3 parts by weight of the reinforcing agent are weighed and mixed evenly to obtain the grouting material in any embodiment of the first aspect. For example, the driving cementitious material, driving molecule, catalyst accelerator, toughening agent, and reinforcing agent are weighed by weight and added to a dry powder mixer, stirred at 20°C for 15 minutes to promote uniform mixing and obtain a uniform powder, which is the grouting material of this application. During the on-site grouting process, the corresponding grouting material is taken and water is added and stirred, controlling the water-cement ratio to 0.6-0.8, for example, a water-cement ratio of 0.6, 0.7, or 0.8 to obtain the grouting slurry, which is then injected through a grouting pump.

[0038] To facilitate a further understanding of this application, the solutions described below are further described in conjunction with embodiments. Those skilled in the art will understand that the examples described in this application are only a portion of the examples, and any other suitable specific examples are within the scope of this application.

[0039] Example 1 This embodiment provides a self-driven permeation-enhanced grouting material, the preparation method and specific operating parameters of which are as follows: polycarboxylic acid molecules and catalytic nanoparticles are mixed uniformly in a dry powder mixer at a mass ratio of 1:4 for 30 minutes at 20°C to obtain a uniform powder; silicate cement is weighed according to the polycarboxylic acid molecules being 1.6% of the mass of silicate cement; the uniform powder and silicate cement are then processed in a fluidized bed airflow pulverizer, where the mechanochemical action generated by the high-speed airflow impact and the gas-phase transport-adsorption of fine particles are used to prepare a self-driven cementitious material.

[0040] Weigh out 100 parts of the driving cementitious material, 5 parts of the driving molecule, 1 part of the catalyst accelerator, 1 part of the toughening agent, and 3 parts of the reinforcing agent according to the mass ratio, add them to the dry powder mixer, stir at 20°C for 15 minutes to promote uniform mixing, and obtain the grouting material.

[0041] Example 2 This embodiment differs from Embodiment 1 in the following ways: 120 parts by weight of the driving cementitious material, 8 parts by weight of the driving molecule, 1 part by weight of the catalyst accelerator, 2 parts by weight of the toughening agent, and 3 parts by weight of the reinforcing agent are weighed and added to a dry powder mixer. The mixture is stirred at 20°C for 15 minutes to promote uniform mixing and obtain the grouting material.

[0042] Example 3 This embodiment differs from Embodiment 1 in the following ways: 110 parts by weight of the driving cementitious material, 7 parts by weight of the driving molecule, 1 part by weight of the catalyst accelerator, 2 parts by weight of the toughening agent, and 1 part by weight of the reinforcing agent are weighed and added to a dry powder mixer. The mixture is stirred at 20°C for 15 minutes to promote uniform mixing and obtain the grouting material.

[0043] Example 4 This embodiment differs from Embodiment 1 in the following ways: polycarboxylic acid molecules and catalytic nanoparticles are mixed in a dry powder mixer at a mass ratio of 1:3 and stirred at 20°C for 30 minutes to obtain a uniform powder; silicate cement is weighed according to the polycarboxylic acid molecules being 1.8% of the mass of silicate cement.

[0044] Example 5 This embodiment differs from Embodiment 1 in the following ways: polycarboxylic acid molecules and catalytic nanoparticles are mixed in a dry powder mixer at a mass ratio of 1:5 and stirred at 20°C for 30 minutes to obtain a uniform powder; silicate cement is weighed according to the polycarboxylic acid molecules being 2% of the mass of silicate cement.

[0045] Experimental Example The grouting materials in each embodiment were mixed with water to obtain grouting slurry with a water-cement ratio of 0.8. The performance of the grouting slurry was tested after use, and the results are shown in Table 1.

[0046] The flowability of the grouting material was tested using the Marvin funnel method. The specific method is as follows: A standard-sized metal conical funnel with a long, narrow outlet at the bottom is used. During the test, the outlet is first blocked with a finger, and a certain volume (usually 1500 mL) of fresh grout is poured into the funnel; then the finger is quickly released, and a timer is started simultaneously to record the time (in seconds) required for all the grout to flow out. The shorter the outflow time, the better the grout flowability and the lower the viscosity.

[0047] The 28-day compressive strength of the grouting material is tested using the following method: Following the standard cement mortar strength testing method, the grout is cast into standard prismatic specimens (typically 40mm × 40mm × 160mm) and cured under standard conditions for 28 days. An axial pressure is applied to the specimen at a constant rate using a pressure testing machine until failure. The compressive strength value is the maximum failure load divided by the bearing area of ​​the specimen (unit: MPa).

[0048] The 28-day flexural strength of the grouting material is tested using the following method: Flexural strength and compressive strength are usually measured using the same set of specimens (40mm×40mm×160mm). After 28 days of curing, a three-point bending test is performed on a material testing machine, and the load at which the specimen breaks is recorded. The flexural strength value is calculated using the three-point bending formula (unit: MPa).

[0049] The permeability coefficient is determined using the following method: The permeability coefficient is a key indicator for evaluating the impermeability of cured grout, and is commonly measured using variable head or constant head permeability tests. The cured grout is processed into cylindrical specimens and sealed inside a permeameter. Under a constant water pressure difference, the amount of water permeating through the specimen within a certain time is measured. The permeability coefficient (unit: cm / s) is calculated according to Darcy's law. The smaller the value, the better the impermeability of the material.

[0050] Table 1 Performance Results of Grouting Materials in Each Embodiment

[0051] As can be seen from the results in Table 1, the grouting material provided in this application significantly improves the grouting reinforcement effect.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A self-driven, permeable, reinforced grouting material, characterized in that, The product comprises the following components in parts by weight: 100-120 parts of self-driven cementitious material, 5-8 parts of driving molecules, 1 part of catalytic accelerator, 1-2 parts of toughening agent, and 1-3 parts of reinforcing agent; wherein the self-driven cementitious material comprises silicate cement, phosphate-containing polycarboxylic acid molecules, and catalytic nanoparticles; wherein the mass ratio of the polycarboxylic acid molecules to the catalytic nanoparticles is 1:3-5; and the polycarboxylic acid molecules constitute 1.6-2% of the mass of the silicate cement.

2. The grouting material according to claim 1, characterized in that, The driving molecules comprise carbamide, ammonium bicarbonate, and ammonium carbamate in a mass ratio of 1:3:

1.

3. The grouting material according to claim 1, characterized in that, The catalytic nanoparticles include ferric oxide nanoparticles and manganese dioxide nanoparticles in a mass ratio of 1:

2.

4. The grouting material according to claim 1, characterized in that, The catalyst promoter comprises cobalt hydroxide and cobalt chloride in a mass ratio of 1:

1.

5. The grouting material according to claim 1, characterized in that, The toughening agent comprises bis(cyclopentadiene) nickel and nickel acetylacetonate in a mass ratio of 4:

1.

6. The grouting material according to claim 1, characterized in that, The reinforcing agent comprises nickel oxide and cobalt oxide in a mass ratio of 1:

1.

7. A method for preparing a self-driven, permeable, enhanced grouting material, characterized in that, Includes the following steps: Polycarboxylic acid molecules and catalytic nanoparticles were uniformly mixed according to stoichiometry to obtain a uniform powder. The self-driven cementitious material is obtained by uniformly adsorbing the uniform powder onto the particles of silicate cement according to stoichiometry. The self-driven cementitious material, driving molecule, catalyst promoter, toughening agent and reinforcing agent are uniformly mixed according to stoichiometry to obtain the grouting material according to any one of claims 1-6.

8. The preparation method according to claim 7, characterized in that, The polycarboxylic acid molecules and the catalytic nanoparticles were stirred in a dry powder stirrer at 20°C for 30-40 minutes.

9. The preparation method according to claim 7, characterized in that, The uniform powder and the silicate cement are used in a fluidized bed airflow pulverizer to prepare the self-driven cementitious material through the mechanochemical action generated by the impact of high-speed airflow and the gas-phase transport-adsorption of fine particles.

10. The preparation method according to claim 7, characterized in that, The self-driven cementitious material, the driving molecule, the catalytic promoter, the toughening agent, and the reinforcing agent are stirred in a dry powder mixer at 20°C for 15-20 minutes. And / or, when using the grouting material, water is added and stirred to obtain grouting slurry; the water-cement ratio of the grouting slurry is 0.6-0.8.

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