High-temperature impact-resistant high-entropy grouting material, preparation method and application thereof

Abstract

The application discloses a kind of high-temperature impact resistant high-entropy grouting materials and its preparation method and application, comprising the following components and mass fraction: ultrafine cement 80~100 parts, steel fiber 4~6 parts, high-entropy alloy powder 40~50 parts, water 80~100 parts, water reducing agent 0.1~0.3 parts, reinforcing agent 20~25 parts, waterproof agent 0.08~0.2 parts, retarder 0.04~0.1 parts, air entraining agent 0.08~0.2 parts;The above components are stirred and mixed in order according to mass fraction, to make high-temperature impact resistant high-entropy grouting material;Then high-temperature impact resistant high-entropy grouting material is injected into surrounding rock crack to reinforce surrounding rock;The grouting material of the application still has good high-temperature resistance and impact resistance after being injected into surrounding rock crack and solidified to reinforce, so that surrounding rock can maintain good stability under subsequent high-temperature and impact dynamic load coupling conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of high-temperature impact resistant high-entropy grouting material and its preparation method and application, belong to grouting reinforced coal rock mass technical field. BACKGROUND

[0002] Due to the increasing demand for energy and infrastructure, there are currently a large number of high-temperature projects, such as deep mining of mineral resources, geothermal development, nuclear waste disposal, and high-temperature tunnel construction. High temperature can weaken the mechanical properties of rock, and the above projects are often accompanied by a large amount of strong dynamic disturbance, which can cause rock instability and damage during construction, and may even cause accidents. Therefore, how to reinforce the fractured rock mass in various high-temperature projects is the direction of research in this industry.

[0003] Grouting technology, as a commonly used method for repairing large deformation and improving the stability of surrounding rock, has been widely used in surrounding rock reinforcement. However, traditional cement-based grouting materials are mostly suitable for normal temperature environments and have high brittleness and poor toughness. When faced with high temperature and impact dynamic load coupling, they are prone to re-fracture, making it difficult to achieve sustained and effective reinforcement. Therefore, how to provide a new grouting reinforcement material that can reinforce fractured surrounding rock and has good high-temperature and impact resistance after reinforcement, thereby maintaining good stability of surrounding rock under high-temperature and impact dynamic load coupling, is a problem that needs to be solved. SUMMARY

[0004] To solve the above problems of the prior art, the present application provides a kind of high-temperature impact resistant high-entropy grouting material and its preparation method and application, which can reinforce fractured surrounding rock and has good high-temperature and impact resistance after reinforcement, thereby maintaining good stability of surrounding rock under high-temperature and impact dynamic load coupling.

[0005] To achieve the above purpose, the technical solution adopted by the present application is as follows: a kind of high-temperature impact resistant high-entropy grouting material, comprising the following components and mass fractions:

[0006] Superfine cement 80-100 parts, steel fiber 4-6 parts, high-entropy alloy powder 40-50 parts, water 80-100 parts, water reducing agent 0.1-0.3 parts, reinforcing agent 20-25 parts, waterproof agent 0.08-0.2 parts, retarder 0.04-0.1 parts, air entraining agent 0.08-0.2 parts.

[0007] Further, the specific components and mass fractions are as follows: superfine cement 90 parts, steel fiber 5 parts, high-entropy alloy powder 45 parts, water 90 parts, water reducing agent 0.2 parts, reinforcing agent 22 parts, waterproof agent 0.1 parts, retarder 0.07 parts, air entraining agent 0.1 parts. The high-temperature impact resistant high-entropy grouting material prepared with the above ratio has the best high-temperature and impact resistance performance.

[0008] Further, the ultra-fine cement, high-entropy alloy powder, water reducing agent, water repellent, air entraining agent are all powders, the reinforcing agent is a liquid, the retarder is a granular, and the steel fiber is a thin and short strip. The high-temperature-resistant and high-entropy grouting material prepared by using the above-mentioned properties of each raw material has better reinforcement effect.

[0009] Further, the specific surface area of the ultra-fine cement is 800 m 2 / kg or more, the particle size is 500 mesh, and the average particle size is 5 μm or less; the diameter of the steel fiber is 0.18-0.2 mm, the length is 10-12 mm, and the tensile strength is greater than 2200 MPa; the particle size of the high-entropy alloy powder is 0-20 μm, and the purity is not less than 99%; the solid content of the reinforcing agent is 50%-52%; the solid content of the water repellent is more than 98%; and the purity of the retarder and the air entraining agent is not less than 99%.

[0010] Further, the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the water repellent is a methyl potassium silicate powder; the retarder is an industrial white sugar; the high-entropy alloy powder is AlCoCrFeNi; the air entraining agent is a triterpene saponin; and the reinforcing agent is a high-grade water-based acrylic resin, which is a kind of acrylic copolymer emulsion. The use of these materials can achieve the desired effect of the prepared grouting material.

[0011] The preparation method of the above-mentioned high-temperature-resistant and high-entropy grouting material includes the following specific steps:

[0012] Step one: put the required mass fraction of water, ultra-fine cement and reinforcing agent into a mixer and stir slowly for 1-3 min;

[0013] Step two: after completing step one, pour the required mass fraction of retarder, water reducing agent, water repellent and air entraining agent into the mixer at a uniform speed, and stir slowly for 2-4 min;

[0014] Step three: after completing step two, evenly sprinkle the required mass fraction of steel fiber into the mixer and stir quickly for 3-5 min to obtain a slurry containing steel fiber;

[0015] Step four: after completing step three, add the required mass fraction of high-entropy alloy powder to the slurry containing steel fiber, and stir quickly for 4-6 min to form a high-temperature-resistant and high-entropy grouting material.

[0016] Further, the stirring speed of slow stirring is 140±5 r / min, and the stirring speed of quick stirring is 285±10 r / min; r / min represents revolutions per minute.

[0017] Compared with the prior art, the high-entropy alloy powder is added into the slurry containing steel fibers to form a high-temperature impact-resistant high-entropy grouting material; wherein the high-entropy alloy powder is mixed with 5 or more metal elements in equal molar ratio or near equal molar ratio, without distinguishing the main elements, and the alloy obtained by smelting has the structural characteristics of simplified microstructure, no tendency to form intermetallic compounds, nano precipitates and amorphous structure, etc., and has excellent high strength, high hardness, high temperature resistance, impact resistance, wear resistance and other characteristics, especially high thermal stability and high temperature oxidation resistance. The inventor found that adding a specific high-entropy alloy powder (AlCoCrFeNi) into the slurry containing steel fibers to make a grouting material can effectively reinforce the surrounding rock cracks, and the reinforced material has good high temperature resistance and impact resistance, so that the surrounding rock can still maintain good stability under the condition of high temperature and impact dynamic load coupling; the reason is that multiple raw materials cooperate with each other; the ultra-fine cement has the characteristics of no pollution, high stone strength, good durability, good impermeability, good flowability, stability and good injectability; the steel fibers and high-entropy alloy powder are uniformly dispersed in the grouting material, and interact with each other, which can effectively increase the strength and toughness of the cement-based grouting material, thereby improving the impact resistance of the material at high temperature; the addition of polycarboxylic acid high-performance water reducing agent to the grouting material can significantly improve the fluidity of the grouting material, and endow the material with good workability and mechanical strength; the addition of high-grade water-based acrylic resin to the grouting material can improve the bending strength, adhesion, compressive strength, wear resistance and impact resistance of the grouting material; the mixture of methyl potassium silicate powder can react with CO2 or other acidic compounds in the air to form a layer of insoluble reticular waterproof and breathable film on the surface of the material, which has the characteristics of excellent waterproofness, impermeability, moisture resistance and aging resistance, and can increase the service life of the material. The addition of industrial sugar to the material can react with the calcium ions on the surface of the cement particles to form a thin film, thereby reducing the attraction of calcium ions to cement particles, reducing the setting speed, and facilitating the uniform distribution of steel fibers and high-entropy alloy powder in the material; the addition of triterpenoid saponin to the material makes the bubble film wall in the grouting material thicker, can maintain a good spherical shape, has strong cohesiveness, good workability, easy pumping, and can improve the durability of the grouting material, improve bleeding and segregation, and improve the erosion resistance; in addition, the steel fibers are uniformly and randomly distributed in the grouting material, and these randomly distributed steel fibers can effectively hinder the expansion of microcracks and the formation of macrocracks in the material, significantly improving the tensile, bending, impact and fatigue resistance of the grouting material, and the steel fibers and high-entropy alloy powder together achieve the impact resistance effect, and finally multiple raw materials cooperate with each other to realize that the grouting material can still maintain good stability of the surrounding rock under the condition of high temperature and impact dynamic load coupling after being injected into the surrounding rock cracks and solidified for reinforcement. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the microstructure of ordinary metal;

[0019] Figure 2 This is a schematic diagram of the microstructure of the high-entropy alloy powder in this invention;

[0020] Figure 3 This is a schematic diagram of the particle size distribution of the high-entropy alloy powder of the present invention. Detailed Implementation

[0021] The present invention will be further described below.

[0022] Example 1: This high-temperature impact-resistant high-entropy grouting material comprises the following components and parts by weight: 98 parts ultrafine cement, 4 parts steel fiber, 48 parts high-entropy alloy powder, 82 parts water, 0.3 parts polycarboxylate high-performance water-reducing agent, 21 parts high-grade water-based acrylic resin, 0.2 parts potassium methylsilicate, 0.05 parts industrial white sugar, and 0.2 parts triterpenoid saponins. The ultrafine cement is CGM ultrafine cement, an inorganic rigid ultrafine grouting material made from ultrafine cement, expanding agent, slag, and other additives. It features non-polluting properties, high aggregate strength, good durability, excellent impermeability, good fluidity, high stability, and high injectability. The high-entropy alloy powder is AlCoCrFeNi, and its microstructure is similar to that of ordinary metals. Figure 1 and 2 As shown, from Figure 1 and 2 As can be seen, ordinary metals have an ordered structure, resulting in low entropy, while the high-entropy alloy powder of this invention has a disordered structure, resulting in high entropy.

[0023] The aforementioned ultrafine cement, high-entropy alloy powder, water-reducing agent, waterproofing agent, and air-entraining agent are all powders; the reinforcing agent is a liquid; the retarder is granular; and the steel fiber is short and thin. A high-temperature impact-resistant, high-entropy grouting material made from these raw materials exhibits superior reinforcement performance.

[0024] The specific surface area of ​​the above-mentioned ultrafine cement is 800 m². 2 The steel fibers have a diameter of 0.18–0.2 mm, a length of 10–12 mm, and a tensile strength greater than 2200 MPa; the high-entropy alloy powder has a particle size of 0–20 μm. The high-entropy alloy powder has a particle size of 0–20 μm. Figure 3 As shown, the purity is not less than 99%; the solid content of the reinforcing agent is 50% to 52%; the solid content of the waterproofing agent is 98% or more; and the purity of the retarder and the air-entraining agent is not less than 99%.

[0025] The specific steps for preparing the above-mentioned high-temperature impact-resistant high-entropy grouting material are as follows:

[0026] Step 1: Add the required proportions of water, ultrafine cement, and reinforcing agent to the mixer and mix slowly for 1 minute;

[0027] Step two: after completing step one, the required mass fraction of the retarder, water reducing agent, waterproof agent, air entraining agent is poured into the blender at a uniform speed, and slowly stirred for 2 min;

[0028] Step three: after completing step two, the required mass fraction of the steel fiber is evenly scattered into the blender, and quickly stirred for 3 min to obtain a slurry containing steel fiber;

[0029] Step four: after completing step three, the required mass fraction of the high-entropy alloy powder is added to the slurry containing steel fiber, and quickly stirred for 4 min to form a high-temperature impact-resistant high-entropy grouting material; the slow stirring speed is 140±5 r / min; the fast stirring speed is 285±10 r / min; r / min represents revolutions per minute.

[0030] Example 2: The raw materials and preparation methods used in example 1 are exactly the same, the only difference is the mass fraction of each raw material, which is as follows: 81 parts of ultra-fine cement, 6 parts of steel fiber, 41 parts of high-entropy alloy powder, 98 parts of water, 0.1 parts of water reducing agent, 24 parts of reinforcing agent, 0.08 parts of waterproof agent, 0.1 parts of retarder, 0.1 parts of air entraining agent.

[0031] Example 3: The raw materials and preparation methods used in example 1 are exactly the same, the only difference is the mass fraction of each raw material, which is as follows: 90 parts of ultra-fine cement, 5 parts of steel fiber, 45 parts of high-entropy alloy powder, 90 parts of water, 0.2 parts of water reducing agent, 22 parts of reinforcing agent, 0.1 parts of waterproof agent, 0.07 parts of retarder, 0.1 parts of air entraining agent.

[0032] The high-temperature impact-resistant high-entropy grouting materials prepared in the above examples 1 to 3 are respectively used to reinforce the surrounding rock under high temperature and dynamic impact environment, through the test, it is known that, compared with the existing reinforcing materials, examples 1 to 3 all have better high-temperature resistance and impact resistance; and the performance of example 3 in the three examples is the best.

[0033] The above is only the preferred embodiment of the present application, it should be pointed out that: for ordinary skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A high-temperature impact-resistant high-entropy grouting material, characterized in that, Comprise the following components and mass fraction: Superfine cement 80~100 parts, steel fiber 4~6 parts, high-entropy alloy powder 40~50 parts, water 80~100 parts, water reducing agent 0.1~0.3 parts, reinforcing agent 20~25 parts, waterproof agent 0.08~0.2 parts, retarder 0.04~0.1 parts, air entraining agent 0.08~0.2 parts.

2. The high-temperature impact-resistant high-entropy grouting material according to claim 1, characterized in that, Specific components and mass fraction are: superfine cement 90 parts, steel fiber 5 parts, high-entropy alloy powder 45 parts, water 90 parts, water reducing agent 0.2 parts, reinforcing agent 22 parts, waterproof agent 0.1 parts, retarder 0.07 parts, air entraining agent 0.1 parts.

3. The high-temperature impact-resistant high-entropy grouting material according to claim 1, characterized in that, The superfine cement, high-entropy alloy powder, water reducing agent, waterproof agent and air entraining agent are all powders, the reinforcing agent is a liquid, the retarder is granular, and the steel fiber is a fine and short strip.

4. The high-temperature impact-resistant high-entropy grouting material according to claim 1, characterized in that, The superfine cement has a specific surface area of 800 m 2 / kg, a particle size of 500 mesh, and an average particle diameter of 5 μm or less; the steel fiber has a diameter of 0.18-0.2 mm, a length of 10-12 mm, and a tensile strength of greater than 2200 MPa; the high-entropy alloy powder has a particle diameter of 0-20 μm and a purity of not less than 99%; the reinforcing agent has a solid content of 50%-52%; the waterproofing agent has a solid content of not less than 98%; and the retarder and air entraining agent each have a purity of not less than 99%.

5. The high-temperature impact-resistant high-entropy grouting material according to claim 1, characterized in that, The water reducing agent is a polycarboxylic acid high-performance water reducing agent; the waterproof agent is a methyl potassium silicate powder; the retarder is industrial white sugar; the high-entropy alloy powder is AlCoCrFeNi; the air entraining agent is a triterpenoid saponin; and the reinforcing agent is a high-grade water-based acrylic resin.

6. A method for preparing the high-temperature impact resistant high-entropy grouting material according to any one of claims 1 to 5, characterized in that, The specific steps are: Step one: put the required mass fraction of water, superfine cement and reinforcing agent into a mixer and stir slowly for 1~3 min; Step two: after completing step one, uniformly pour the required mass fraction of retarder, water reducing agent, waterproof agent and air entraining agent into the mixer at a constant speed, and stir slowly for 2~4 min; Step three: after completing step two, evenly sprinkle the required mass fraction of steel fiber into the mixer and stir quickly for 3~5 min to obtain a slurry containing steel fiber; Step four: after completing step three, add the required mass fraction of high-entropy alloy powder to the slurry containing steel fiber and stir quickly for 4~6 min to form a high-temperature impact-resistant high-entropy grouting material.

7. The preparation method according to claim 6, characterized in that, The slow stirring speed is 140±5 r / min, and the quick stirring speed is 285±10 r / min.

8. An application of the high-temperature impact-resistant high-entropy grouting material of any one of claims 1 to 5 to reinforce surrounding rock in a high-temperature and dynamic load impact environment.

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