An expansive wave-absorbing and vibration-damping grouting material for deep engineering and a preparation method thereof

Abstract

The application discloses an expansive wave-absorbing damping grouting material suitable for deep engineering and a preparation method thereof, and belongs to the technical field of grouting material reinforcement and solid waste resource utilization. The grouting material is based on slag, and specific components include: 100 parts of slag, 20-30 parts of a composite activator, 0-10 parts of calcium oxide, 10-20 parts of rubber powder, and a water-cement ratio of 0.5. The grouting material prepared by the application has excellent expansion performance and wave-absorbing performance, has a wide application prospect, and is especially suitable for complex engineering environments such as deep mining, effectively prevents and controls rock burst disasters induced by high ground stress and strong blasting disturbance in deep engineering, and provides strong support for improving engineering safety and reducing environmental impact.

Description

Technical Field

[0001] This invention belongs to the technical field of grouting material reinforcement and solid waste resource utilization, specifically relating to an expansion-type wave-absorbing and vibration-damping grouting material suitable for deep engineering and its preparation method. Background Technology

[0002] Mineral resources are a crucial material foundation for my country's economic and social development, supporting 70% of the national economy. Over 90% of my country's energy and approximately 80% of its industrial raw materials originate from mineral resources. However, with decades of continuous development, shallow mineral resources are nearing depletion. Compared to shallow engineering, deep engineering faces a complex environment characterized by "three highs and one disturbance": high ground stress, high ground temperature, high karst water pressure, and strong mining disturbance. High ground stress, high ground temperature, and high karst water pressure are inherent characteristics of the deep rock mass environment, while the strong disturbance caused by mining is an additional feature. Both are the fundamental causes of frequent disasters in deep mining. In particular, mining under high ground stress fields and blasting disturbances easily induce the accumulation and sudden release of strain energy stored in the rock mass, readily causing dynamic disasters such as rock bursts, collapses, and roof falls, seriously affecting the safe and efficient extraction of deep resources. In deep resource extraction, rock mass support is necessary to control rock mass deformation and prevent dynamic disasters such as rock bursts, collapses, and roof falls, thereby ensuring the safety of personnel and equipment. As a proactive disaster control and prevention measure, support has become increasingly widespread, making the selection of rock mass support technology particularly important.

[0003] Grouting materials play a crucial role in the grouting process, and their performance directly affects the safety, stability, and economy of the project. Therefore, selecting grouting materials that meet specific engineering needs and environmental conditions while also possessing good performance, cost-effectiveness, and environmental friendliness is extremely important. In engineering applications, grouting materials can be divided into two categories: cement-based grouting materials and chemical grouting materials and solid waste-based grouting materials. Cement-based grouting materials have poor injectability, which limits their use; chemical grouting materials are expensive and have a certain degree of toxicity, thus also limiting their use. However, for specific engineering problems, novel grouting materials prepared using cement or other cement substitutes as raw materials possess various special properties. For example: Patent CN117585952A developed a cement-polyurethane composite grouting material suitable for reinforcing dense soft rock based on the low viscosity and easy permeability of a two-component mixture composed of polyurethane and acrylate; Patent CN115403327B developed a new type of reinforcement material by organically and inorganically mixing a permeable material with a splitting material, and realized its application in the reinforcement of siltstone formations; Patent CN111763063A, based on the principle of inorganic and organic material composites, prepared a new type of grouting material with expansion properties, high permeability, and high durability using high-cementing-activity cementitious materials and auxiliary cementitious materials, for treating engineering problems of highly permeable formations in dynamic water environments; Patent CN118145948A used river sand instead of cement as aggregate and alkali-activated solid waste-based materials to prepare a green and environmentally friendly mining solid waste-based grouting material with good fluidity and controllable setting time, for treating mine water inrush problems.

[0004] In deep mining, traditional grouting materials such as cement-based and chemical grouting materials, while showing significant performance in reinforcement and sealing, have significant limitations when dealing with complex geological conditions and special engineering requirements. First, the expansion performance of traditional grouting materials is limited, failing to effectively compensate for the shrinkage that occurs during the solidification process, resulting in a loose bond between the grout and the rock mass, reducing overall structural stability. Second, these materials lack sufficient wave absorption and vibration damping performance when facing the strong unloading of mine excavation and the intense disturbance of blasting, failing to effectively absorb and disperse blasting shock waves, thus causing stress concentration in the rock mass and increasing the risk of rockbursts. To address these critical problems, this invention develops a novel expandable wave-absorbing grouting material based on solid waste slag. Summary of the Invention

[0005] To address the problems mentioned above, this invention aims to provide a novel expandable microwave absorbing grouting material and its preparation method. The grouting material possesses excellent microwave absorption properties, significantly absorbing and dispersing stress waves, reducing rock mass stress, effectively preventing rockbursts and other disasters, and improving the safety of mining operations.

[0006] This invention proposes a novel expandable microwave absorbing grouting material. Its development concept utilizes blast furnace slag, a solid waste material rich in aluminosilicates and possessing potential as a cementing agent, as a precursor to replace cement. The combined use of sodium hydroxide and water glass as composite activators effectively activates the latent activity of the slag, enhancing the material's strength and durability. The volume expansion resulting from the reaction of calcium oxide (CaO) with water during hydration to form calcium hydroxide (Ca(OH)2) compensates for the shrinkage caused by water evaporation and chemical reactions during the curing process, thereby improving the material's density. Rubber powder, a material with high elasticity and high energy absorption, deforms upon impact, absorbing impact energy and reducing stress wave propagation. The expandable microwave absorbing grouting material made from the combination of these materials overcomes the limitations of ordinary grouting materials in deep mining, such as insufficient expansion performance, poor microwave absorption performance, and slow early strength development. Furthermore, it achieves resource reuse, meeting the requirements of green and environmentally friendly sustainable development.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering, wherein the composition and mass ratio of the grouting material is: slag: composite activator: calcium oxide: rubber powder = 100: (20-30): (0-10): (10-20).

[0009] The water-cement ratio of the grouting material is 0.5:1.

[0010] The slag is S95 grade high-quality alkaline highly active granulated blast furnace slag with a fineness of 800 mesh or above.

[0011] The composite activator comprises sodium hydroxide particles and water glass solution. The modulus of the composite activator is controlled to be 1, that is, the mass ratio of sodium hydroxide to water glass is 0.22. The sodium hydroxide is 1 mol / L standard analytical grade, and the water glass is liquid sodium silicate with a modulus of 2.2 to 2.4, a content of 40% to 44%, and a Baume degree of 50.

[0012] The calcium oxide has a particle size of less than 0.05 mm.

[0013] The rubber powder is elastic waste tire rubber granules with a fineness of 100 mesh or higher.

[0014] A method for preparing an intumescent wave-absorbing and vibration-damping grouting material suitable for deep engineering includes the following steps: first, a composite activator is prepared; then, water is added to the composite activator and stirred thoroughly until the solution is clear; the solution is cooled to room temperature to obtain a mixed solution; slag, calcium oxide, and rubber powder are stirred evenly until there is no layering, and then added to the mixed solution; the mixture is stirred rapidly until homogeneous to obtain the intumescent wave-absorbing and vibration-damping grouting material, which can then be molded and cured.

[0015] The preparation method of the composite activator is as follows: weigh the corresponding mass of sodium hydroxide particles and water glass solution according to the required components and mass ratio, mix and stir for 2 min to 3 min until the sodium hydroxide particles are completely dissolved in the water glass solution.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The grouting material prepared by this invention possesses high-performance expansion compensation capabilities, effectively solving the shrinkage problem of the grout body. The combined use of sodium hydroxide and water glass as activators effectively activates the latent activity of the slag, enhancing the material's strength and durability. Calcium oxide (CaO) reacts with water during hydration to generate calcium hydroxide (Ca(OH)₂). 2， The volume expansion generated by this reaction compensates for the shrinkage of the grouting material during the curing process caused by moisture evaporation and chemical reactions, thereby improving the material's density. It also exhibits excellent wave absorption properties, significantly reducing damage to the surrounding rock mass from blast shock waves. Furthermore, the grouting material of this invention not only excels in high-performance expansion compensation, wave absorption and vibration reduction, and rapid reinforcement, but also possesses broad market application prospects, suitable for complex engineering environments such as deep mining, tunnel engineering, underground space development, and geotechnical engineering reinforcement. These beneficial effects not only solve the technical problems of traditional grouting materials in practical engineering but also provide innovative solutions for the reuse of industrial waste such as slag and waste rubber, possessing significant technical value and market potential. Attached Figure Description

[0018] Figure 1 A flowchart illustrating the expansion-type wave-absorbing and vibration-damping grouting material prepared according to the present invention;

[0019] Figure 2 The flowability diagrams are for the grouting materials prepared in Examples 1-4 of this invention.

[0020] Figure 3 The compressive strength diagrams are for the grouting materials prepared in Examples 1-4 of this invention.

[0021] Figure 4 The expansion pressure diagrams are of the grouting materials prepared in Examples 5-7 of this invention;

[0022] Figure 5The transmission coefficient diagrams are for the grouting materials prepared in Examples 8-10 of this invention. Detailed Implementation

[0023] The following specific implementation examples illustrate the embodiments of the present invention. Those skilled in the art can gain further insight into the advantages and effects of the present invention from this specification. Obviously, the provided implementation examples are only some instances of the present invention and do not cover all possible implementations. Other implementations derived by those skilled in the art based on the embodiments of the present invention without innovative work should also be considered within the scope of protection of the present invention.

[0024] An expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering, wherein the composition and mass ratio of the grouting material is: slag: composite activator: calcium oxide: rubber powder = 100: (20-30): (0-10): (10-20).

[0025] The water-cement ratio of the grouting material is 0.5:1.

[0026] The slag is S95 grade high-quality alkaline highly active granulated blast furnace slag with a fineness of 800 mesh or above.

[0027] The composite activator comprises sodium hydroxide particles and water glass solution. The sodium hydroxide is 1 mol / L standard analytical grade, and the water glass is liquid sodium silicate with a modulus of 2.2-2.4, a content of 40%-44%, and a Baume degree of 50.

[0028] The calcium oxide has a particle size of less than 0.05 mm.

[0029] The rubber powder is elastic waste tire rubber granules with a fineness of 100 mesh or higher.

[0030] A method for preparing an intumescent wave-absorbing and vibration-damping grouting material suitable for deep engineering includes the following steps: first, a composite activator is prepared; then, water is added to the composite activator and stirred thoroughly until the solution is clear; the solution is cooled to room temperature to obtain a mixed solution; slag, calcium oxide, and rubber powder are stirred evenly until there is no layering, and then added to the mixed solution; the mixture is stirred rapidly until homogeneous to obtain the intumescent wave-absorbing and vibration-damping grouting material, which can then be molded and cured.

[0031] The preparation method of the composite activator is as follows: weigh out the corresponding mass of sodium hydroxide particles and water glass solution according to the required components and mass ratio, mix and stir for 2 min to 3 min until the sodium hydroxide particles are completely dissolved in the water glass solution.

[0032] Example 1

[0033] An expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering, wherein the composition and mass ratio of the grouting material are as follows: 25% composite activator, 0% calcium oxide, 10% rubber powder, and water-cement ratio of 0.5, based on the percentage of slag mass.

[0034] A method for preparing an intumescent wave-absorbing and vibration-damping grouting material suitable for deep engineering includes the following steps: first, a composite activator is prepared; then, water is added to the composite activator and stirred thoroughly until the solution is clear; the solution is cooled to room temperature to obtain a mixed solution; slag, calcium oxide, and rubber powder are stirred evenly until there is no layering, and then added to the mixed solution; the mixture is stirred rapidly until homogeneous to obtain the intumescent wave-absorbing and vibration-damping grouting material, which can then be molded and cured.

[0035] The preparation method of the composite activator is as follows: weigh the corresponding mass of sodium hydroxide particles and water glass solution according to the required components and mass ratio, mix and stir for 2 minutes until the sodium hydroxide particles are completely dissolved in the water glass solution.

[0036] like Figures 1-3 As shown, in this embodiment, the fluidity of the grouting material is 217.1 mm, the 1-day compressive strength of the grouting material is 9.07 MPa, and the 7-day compressive strength is 18.44 MPa.

[0037] Example 2

[0038] An expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering, wherein the composition and mass ratio of the grouting material are as follows: based on the percentage of slag mass, the specific ratio is 25% composite activator, 5% calcium oxide, 15% rubber powder, and a water-cement ratio of 0.5.

[0039] A method for preparing an intumescent wave-absorbing and vibration-damping grouting material suitable for deep engineering includes the following steps: first, a composite activator is prepared; then, water is added to the composite activator and stirred thoroughly until the solution is clear; the solution is cooled to room temperature to obtain a mixed solution; slag, calcium oxide, and rubber powder are stirred evenly until there is no layering, and then added to the mixed solution; the mixture is stirred rapidly until homogeneous to obtain the intumescent wave-absorbing and vibration-damping grouting material, which can then be molded and cured.

[0040] The preparation method of the composite activator is as follows: weigh the corresponding mass of sodium hydroxide particles and water glass solution according to the required components and mass ratio, mix and stir for 2 minutes until the sodium hydroxide particles are completely dissolved in the water glass solution.

[0041] like Figures 1-3 As shown, in this embodiment, the fluidity of the grouting material is 222.3 mm, the 1-day compressive strength of the grouting material is 11.36 MPa, and the 7-day compressive strength is 22.15 MPa.

[0042] Example 3

[0043] An expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering, wherein the composition and mass ratio of the grouting material are as follows: based on the percentage of the slag mass, the specific ratio is 30% composite activator, 5% calcium oxide, 10% rubber powder, and a water-cement ratio of 0.5.

[0044] A method for preparing an intumescent wave-absorbing and vibration-damping grouting material suitable for deep engineering includes the following steps: first, a composite activator is prepared; then, water is added to the composite activator and stirred thoroughly until the solution is clear; the solution is cooled to room temperature to obtain a mixed solution; slag, calcium oxide, and rubber powder are stirred evenly until there is no layering, and then added to the mixed solution; the mixture is stirred rapidly until homogeneous to obtain the intumescent wave-absorbing and vibration-damping grouting material, which can then be molded and cured.

[0045] The preparation method of the composite activator is as follows: weigh the corresponding mass of sodium hydroxide particles and water glass solution according to the required components and mass ratio, mix and stir for 2 minutes until the sodium hydroxide particles are completely dissolved in the water glass solution.

[0046] like Figures 1-3 As shown, in this embodiment, the fluidity of the grouting material is 210.8 mm, the 1-day compressive strength of the grouting material is 9.26 MPa, and the 7-day compressive strength is 17.21 MPa.

[0047] Example 4

[0048] An expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering, wherein the composition and mass ratio of the grouting material are as follows: based on the percentage of slag mass, the specific ratio is 30% composite activator, 5% calcium oxide, 20% rubber powder, and a water-cement ratio of 0.5.

[0049] A method for preparing an intumescent wave-absorbing and vibration-damping grouting material suitable for deep engineering includes the following steps: first, a composite activator is prepared; then, water is added to the composite activator and stirred thoroughly until the solution is clear; the solution is cooled to room temperature to obtain a mixed solution; slag, calcium oxide, and rubber powder are stirred evenly until there is no layering, and then added to the mixed solution; the mixture is stirred rapidly until homogeneous to obtain the intumescent wave-absorbing and vibration-damping grouting material, which can then be molded and cured.

[0050] The preparation method of the composite activator is as follows: weigh the corresponding mass of sodium hydroxide particles and water glass solution according to the required components and mass ratio, mix and stir for 2 minutes until the sodium hydroxide particles are completely dissolved in the water glass solution.

[0051] like Figures 1-3 As shown, the fluidity of the grouting material in this embodiment is 217.6 mm, the 1-day compressive strength of the grouting material is 7.82 MPa, and the 7-day compressive strength is 16.68 MPa.

[0052] In the fluidity of the grouting materials described in Examples 1-4, the rubber powder concentration mainly promotes the fluidity of the grouting material, while the activator concentration and calcium oxide concentration mainly inhibit it. The smooth surface and excellent hydrophobicity of the rubber powder promote the flow of the grout; the activator concentration and calcium oxide concentration mainly affect the fluidity of the grout by influencing the reaction rate.

[0053] In the compressive strength of the grouting materials described in Examples 1-4, the activator mainly promotes the strength. Increasing the concentration of the activator within a suitable range is beneficial to enhancing the compressive strength. However, after exceeding a certain threshold, increasing the concentration of the activator will actually reduce the compressive strength. Rubber powder mainly inhibits the compressive strength, and the effect is more obvious. Appropriately increasing the concentration of calcium oxide is also beneficial to increasing the compressive strength.

[0054] Example 5

[0055] An expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering, wherein the composition and mass ratio of the grouting material are as follows: based on the percentage of slag mass, the specific ratio is 25.53% composite activator, 0% calcium oxide, 14.51% rubber powder, and a water-cement ratio of 0.5.

[0056] A method for preparing an intumescent wave-absorbing and vibration-damping grouting material suitable for deep engineering includes the following steps: first, a composite activator is prepared; then, water is added to the composite activator and stirred thoroughly until the solution is clear; the solution is cooled to room temperature to obtain a mixed solution; slag, calcium oxide, and rubber powder are stirred evenly until there is no layering, and then added to the mixed solution; the mixture is stirred rapidly until homogeneous to obtain the intumescent wave-absorbing and vibration-damping grouting material, which can then be molded and cured.

[0057] The preparation method of the composite activator is as follows: weigh the corresponding mass of sodium hydroxide particles and water glass solution according to the required components and mass ratio, mix and stir for 2 minutes until the sodium hydroxide particles are completely dissolved in the water glass solution.

[0058] like Figure 4 As shown, the expansion pressure of the grouting material in this embodiment is 0.04 MPa, which should be due to the expansion of the grouting material caused by the calcium oxide and other components contained in the slag itself.

[0059] Example 6

[0060] An expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering, wherein the novel expandable wave-absorbing and vibration-damping grouting material using slag as raw material has the following specific proportions based on the percentage of slag mass: 25.53% composite activator, 5% calcium oxide, 14.51% rubber powder, and a water-cement ratio of 0.5.

[0061] A method for preparing an intumescent wave-absorbing and vibration-damping grouting material suitable for deep engineering includes the following steps: first, a composite activator is prepared; then, water is added to the composite activator and stirred thoroughly until the solution is clear; the solution is cooled to room temperature to obtain a mixed solution; slag, calcium oxide, and rubber powder are stirred evenly until there is no layering, and then added to the mixed solution; the mixture is stirred rapidly until homogeneous to obtain the intumescent wave-absorbing and vibration-damping grouting material, which can then be molded and cured.

[0062] The preparation method of the composite activator is as follows: weigh the corresponding mass of sodium hydroxide particles and water glass solution according to the required components and mass ratio, mix and stir for 2 minutes until the sodium hydroxide particles are completely dissolved in the water glass solution.

[0063] like Figure 4 As shown, the expansion pressure of the grouting material in this embodiment is 2.84 MPa. As the concentration of calcium oxide increases, the release rate of calcium ions matches the hydration reaction rate of the slag, the reaction continues, the calcium hydroxide crystals are generated stably, and the expansion pressure rises steadily.

[0064] Example 7

[0065] An expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering, wherein the novel expandable wave-absorbing and vibration-damping grouting material using slag as raw material has the following specific proportions based on the percentage of slag mass: 25.53% composite activator, 10% calcium oxide, 14.51% rubber powder, and a water-cement ratio of 0.5.

[0066] A method for preparing an intumescent wave-absorbing and vibration-damping grouting material suitable for deep engineering includes the following steps: first, a composite activator is prepared; then, water is added to the composite activator and stirred thoroughly until the solution is clear; the solution is cooled to room temperature to obtain a mixed solution; slag, calcium oxide, and rubber powder are stirred evenly until there is no layering, and then added to the mixed solution; the mixture is stirred rapidly until homogeneous to obtain the intumescent wave-absorbing and vibration-damping grouting material, which can then be molded and cured.

[0067] The preparation method of the composite activator is as follows: weigh the corresponding mass of sodium hydroxide particles and water glass solution according to the required components and mass ratio, mix and stir for 2 minutes until the sodium hydroxide particles are completely dissolved in the water glass solution.

[0068] like Figure 4 As shown, the expansion pressure of the grouting material in this embodiment is 4.25 MPa. With the increase of calcium oxide concentration, the amount of calcium hydroxide crystals generated by hydration increases significantly, and the expansion pressure is positively correlated with the calcium oxide concentration. It should be noted that high concentrations of calcium oxide may cause the expansion pressure to be released prematurely, and stable expansion cannot be maintained in the later stages due to water shortage or pore blockage.

[0069] Example 8

[0070] An expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering, wherein the novel expandable wave-absorbing and vibration-damping grouting material using slag as raw material has the following specific proportions based on the percentage of slag mass: 25.53% composite activator, 4.45% calcium oxide, 10% rubber powder, and a water-cement ratio of 0.5.

[0071] A method for preparing an intumescent wave-absorbing and vibration-damping grouting material suitable for deep engineering includes the following steps: first, a composite activator is prepared; then, water is added to the composite activator and stirred thoroughly until the solution is clear; the solution is cooled to room temperature to obtain a mixed solution; slag, calcium oxide, and rubber powder are stirred evenly until there is no layering, and then added to the mixed solution; the mixture is stirred rapidly until homogeneous to obtain the intumescent wave-absorbing and vibration-damping grouting material, which can then be molded and cured.

[0072] The preparation method of the composite activator is as follows: weigh the corresponding mass of sodium hydroxide particles and water glass solution according to the required components and mass ratio, mix and stir for 2 minutes until the sodium hydroxide particles are completely dissolved in the water glass solution.

[0073] like Figure 5 As shown, the transmission coefficient of the grouting material in this embodiment is 0.41. Based on the stress amplitudes of the incident and transmitted waves obtained from the SHPB impact test results, the transmission coefficient was calculated. The larger the transmission coefficient, the more energy the stress wave transmits through the grouting material, meaning the material's blocking and absorption effect on stress waves is weaker. When the rubber powder concentration is low, the rubber powder particles are sparsely distributed in the grouting material, and their effect on absorbing stress waves is minimal.

[0074] Example 9

[0075] An expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering, wherein the novel expandable wave-absorbing and vibration-damping grouting material using slag as raw material has the following specific proportions based on the percentage of slag mass: composite activator 25.53%, calcium oxide 4.45%, rubber powder 15%, and water-cement ratio 0.5.

[0076] A method for preparing an intumescent wave-absorbing and vibration-damping grouting material suitable for deep engineering includes the following steps: first, a composite activator is prepared; then, water is added to the composite activator and stirred thoroughly until the solution is clear; the solution is cooled to room temperature to obtain a mixed solution; slag, calcium oxide, and rubber powder are stirred evenly until there is no layering, and then added to the mixed solution; the mixture is stirred rapidly until homogeneous to obtain the intumescent wave-absorbing and vibration-damping grouting material, which can then be molded and cured.

[0077] The preparation method of the composite activator is as follows: weigh the corresponding mass of sodium hydroxide particles and water glass solution according to the required components and mass ratio, mix and stir for 2 minutes until the sodium hydroxide particles are completely dissolved in the water glass solution.

[0078] like Figure 5 As shown, the transmission coefficient of the grouting material in this embodiment is 0.32. When the concentration of rubber powder increases, voids are created in the grouting material. These voids can serve as a space for elastic storage and release of energy, giving stress waves more opportunities to be lost. Furthermore, the elasticity and viscoelasticity of the colloid itself can be better expressed, so that the stress waves will be intercepted by some fine particles during the transmission process. As deformation and oscillation occur, the stress waves penetrate into the material and are eventually weakened and absorbed.

[0079] Example 10

[0080] An expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering, wherein the novel expandable wave-absorbing and vibration-damping grouting material using slag as raw material has the following specific proportions based on the percentage of slag mass: composite activator 25.53%, calcium oxide 4.45%, rubber powder 20%, and water-cement ratio 0.5.

[0081] A method for preparing an intumescent wave-absorbing and vibration-damping grouting material suitable for deep engineering includes the following steps: first, a composite activator is prepared; then, water is added to the composite activator and stirred thoroughly until the solution is clear; the solution is cooled to room temperature to obtain a mixed solution; slag, calcium oxide, and rubber powder are stirred evenly until there is no layering, and then added to the mixed solution; the mixture is stirred rapidly until homogeneous to obtain the intumescent wave-absorbing and vibration-damping grouting material, which can then be molded and cured.

[0082] The preparation method of the composite activator is as follows: weigh the corresponding mass of sodium hydroxide particles and water glass solution according to the required components and mass ratio, mix and stir for 2 minutes until the sodium hydroxide particles are completely dissolved in the water glass solution.

[0083] like Figure 5 As shown, the transmission coefficient of the grouting material in this embodiment is 0.26. As the concentration of rubber powder increases, the wave absorption and vibration reduction effect of the grouting material gradually becomes more obvious.

Claims

1. An expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering, characterized in that, The composition and mass ratio of the grouting material are: slag: composite activator: calcium oxide: rubber powder = 100: (20-30): (0-10): (10-20); The composite activator comprises sodium hydroxide particles and water glass solution. The modulus of the composite activator is controlled to be 1, that is, the mass ratio of sodium hydroxide to water glass is 0.

22. The sodium hydroxide is 1 mol / L standard analytical grade, and the water glass is liquid sodium silicate with a modulus of 2.2 to 2.4, a content of 40% to 44%, and a Baume degree of 50.

2. The expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering as described in claim 1, characterized in that, The water-cement ratio of the grouting material is 0.5:

1.

3. The expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering as described in claim 1, characterized in that, The slag is S95 grade high-quality alkaline highly active granulated blast furnace slag with a fineness of 800 mesh or higher.

4. The expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering as described in claim 1, characterized in that, The calcium oxide has a particle size of less than 0.05 mm.

5. The expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering according to claim 1, characterized in that, The rubber powder is elastic waste tire rubber granules with a fineness of 100 mesh or higher.

6. A method for preparing an expandable wave-absorbing and vibration-damping grouting material suitable for deep engineering as described in any one of claims 1-5, characterized in that, The process includes the following steps: First, prepare a composite activator, add mixing water to the composite activator and stir thoroughly until the solution is clear, then cool to room temperature to obtain a mixed solution; stir slag, calcium oxide and rubber powder evenly until there is no layering, add them to the mixed solution, and stir quickly until uniform to obtain an expansion-type wave-absorbing and vibration-damping grouting material, then install the mold and cure it.

7. The preparation method of an expansion-type wave-absorbing and vibration-damping grouting material suitable for deep engineering according to claim 6, characterized in that, The preparation method of the composite activator is as follows: weigh the corresponding mass of sodium hydroxide particles and water glass solution according to the required components and mass ratio, mix and stir for 2 min to 3 min until the sodium hydroxide particles are completely dissolved in the water glass solution.

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