A high temperature resistant cement-based grouting material and its preparation method and application

Abstract

The present invention relates to the technical field of cement-based grouting materials, and specifically discloses a high-temperature resistant cement-based grouting material, a preparation method thereof, and an application thereof. Calculated by mass fraction, the grouting material comprises the following components: 50-70% silicate cement, 25-45% activated composite powder, 3-8% functional admixture, and 0.5-0.8 times the mass of the silicate cement in mixing water. The activated composite powder is obtained by grinding gold tailings powder, spodumene, sillimanite, and nanocrystalline zirconium dioxide. The grouting material of the present invention has the technical advantages of excellent high-temperature resistance, no volume shrinkage, and lower cost.

Description

Technical Field

[0001] The present invention relates to the technical field of cement-based grouting materials, and in particular to a high-temperature resistant cement-based grouting material and a preparation method and application thereof. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

[0003] With the implementation of national strategies such as "Strengthening China's Transportation" and "Strengthening China's Energy," underground engineering construction in my country's transportation, mining, and water conservancy sectors is advancing deeper into the Earth, where geological conditions are extremely complex. For example, the Sanshan Island auxiliary shaft, currently under construction and boasting Asia's deepest mine, has a designed depth of 1,915 meters. The Grand Canyon Tunnel on the Emei-Hankou Expressway reaches a maximum depth of 1,944 meters. The Han-Wei River Diversion Tunnel, which traverses the Qinling Mountains, has a maximum depth of 2,012 meters.

[0004] As underground projects deepen, the temperature increases at a gradient of approximately 3°C / 100m. This poses a threat to engineering construction from extreme high-temperature environments, highlighting the issue of high geothermal heat. Furthermore, the complex environment of deep rock masses, characterized by high fissure water pressure and strong engineering disturbances, makes high-temperature fissure water hazards a significant geological hazard in deep underground engineering construction, posing a serious threat to project safety. Controlling water hazards in high-temperature, water-rich, fissured rock masses has become a critical requirement for ensuring the safe construction of deep underground projects in my country. Grouting is the most commonly used method for managing water hazards in high-temperature, water-rich, fissured rock masses. Grouting effectively fills and cements rock fissures, blocks fissure water channels, and prevents sudden water inrush accidents.

[0005] Ordinary Portland cement-based materials are currently the most widely used grouting materials. After solidification and hardening, they form a solid cement mass that fills and seals cracks. However, under high-temperature conditions, these materials can experience significant strength loss, volume shrinkage, and poor durability. Specifically, the hydration product ettringite in the cement mass begins to decompose between 60 and 80°C, resulting in a loose cement structure. At higher temperatures, the hydration product, CSH gel, dehydrates, leading to irreversible strength loss. Furthermore, high temperatures accelerate the evaporation of free water from the pores of the cement mass, the desorption of adsorbed water between colloidal particles, and the decomposition of the expansive hydration product ettringite, leading to more significant volume shrinkage. The internal stress generated by this volume shrinkage creates micro-cracks within the cement mass and at the slurry-rock interface, forming potential water-conducting pathways. This not only compromises the water-blocking effectiveness of the cement mass but also provides seepage paths for aggressive media, significantly reducing the durability of the slurry mass.

[0006] Current solutions primarily include adding mineral admixtures such as silica fume and mineral powder, temperature-regulating materials such as zirconium tungstate and ceramic powder, and high-temperature reinforcement materials such as graphene. However, the production of mineral admixtures like silica fume and mineral powder is energy-intensive, and the effectiveness of heavy metal solidification in some industrial waste residues (such as dechlorinated fly ash) remains to be verified. The complex and costly preparation processes for zirconium tungstate and low-expansion ceramic materials hinder their large-scale application. While graphene can somewhat inhibit the coarsening of the pore structure in cement paste, it still exhibits significant strength degradation at high temperatures, and thus cannot effectively enhance the high-temperature resistance of ordinary Portland cement-based grouting materials. Summary of the Invention

[0007] The present invention provides a high-temperature resistant cement-based grouting material and its preparation method and application, which has the technical advantages of excellent high-temperature resistance, no volume shrinkage, and lower cost. Specifically, the technical solution of the present invention is as follows.

[0008] First, the present invention provides a high-temperature resistant cement-based grouting material, which comprises the following components by mass fraction: 50-70% silicate cement, 25-45% activated composite powder, 3-8% functional admixture, and 0.5-0.8 times the total mass of the silicate cement and the activated composite powder. The activated composite powder is composed of gold tailings powder, spodumene, sillimanite and nanocrystalline zirconium dioxide ( ) is obtained by grinding.

[0009] Furthermore, the functional admixture includes at least one of a water reducer, a retarder, and an expansion agent. The ratio of the water reducer, retarder, and expansion agent is 0.5-1.3%, 0.05-0.2%, and 2.45-6.5%. Optionally, the water reducer includes at least one of a polycarboxylate water reducer, a naphthalene-based water reducer, and a lignin sulfonate water reducer. The retarder includes at least one of sodium tripolyphosphate, borax, citric acid, gluconic acid, and tartaric acid. The expansion agent includes at least one of magnesium oxide, calcium oxide, and calcium sulfoaluminate.

[0010] Furthermore, the mass ratio of the gold tailings powder, spodumene, sillimanite, and nanocrystalline zirconium dioxide is: 4~6:1.5~3:1.5~3:0.1~0.5.

[0011] Furthermore, the activated composite powder is prepared by wet-grinding a mixed powder of the gold tailings powder, spodumene, sillimanite, and nanocrystalline zirconium dioxide with water, and then drying. Optionally, the water accounts for 40-50% of the weight of the mixed powder.

[0012] Furthermore, the mixed powder also includes 0.05-0.1% by weight of a grinding aid. Optionally, the grinding aid includes at least one of triethanolamine, triisopropanolamine, ethylene glycol, and diethylene glycol, which helps reduce agglomeration and enhance particle collision efficiency, thereby promoting reactions between the components.

[0013] Furthermore, the grinding speed is 800-1200 r / min, and the grinding time is 6-8 hours.

[0014] Furthermore, the drying temperature is 80-100° C., and the drying time is 8-10 hours.

[0015] Secondly, the present invention provides a preparation method of the high temperature resistant cement-based grouting material, comprising the following steps: mixing the silicate cement with the activated composite powder, and then adding the functional admixture and mixing water and stirring evenly to obtain the material.

[0016] Finally, the present invention discloses the application of the high temperature resistant cement-based grouting material in the fields of transportation, mining, water conservancy, etc.

[0017] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0018] The cement-based grouting material of the present invention is added with specially treated activated composite powder, which effectively improves the strength of the slurry stone under high temperature environment and has the effect of resisting the shrinkage of the cement stone. The reason is that during the mechanical grinding process, the collision of particles in the powder generates local high temperature (instantaneous temperature can reach hundreds of degrees) and high pressure to form a micro-reaction environment, wherein: the sillimanite in Under the above action, it is partially transformed into a highly active mullite embryo. Under the above action, the mineral phase forms hydroxylation products containing Al and Si on the surface and releases ions. The dissociated part is described The ions dissolve in the water added during wet grinding to form an alkaline environment, which promotes the active components in the gold tailings powder ( 、 ) dissolves during the grinding process. The active components dissolved from the gold tailings powder further react to form an amorphous lithium aluminum silicate colloidal network structure. ) On the one hand, it acts as a nucleation site to adsorb the active components in the gold tailings powder and the spodumene released in the above process. , thereby reducing the nucleation barrier and guiding the directional growth of the metastable lithium zirconate solid solution through surface energy driving, thereby helping to hinder crack propagation and improve material strength. Under grinding stress, a crystal transformation (monoclinic to tetragonal) occurs, and the accompanying volume change further induces lattice distortion in the powder particles, thereby promoting the aforementioned reactions. The mullite embryos formed by these reactions serve as a high-temperature skeletal structure, acting as "rigid support points" during cement hydration, hindering volume shrinkage and crack propagation in the cement paste at high temperatures. The lithium aluminum silicate colloidal network effectively fills the pores within the cement paste structure formed by the grouting material, preventing volume shrinkage and structural degradation caused by pore water evaporation. The lithium zirconate solid solution, acting as a high-temperature resistant, tough phase, effectively enhances the grouting material's resistance to cracking caused by thermal stress, thereby improving its high-temperature resistance. Furthermore, the grouting material of the present invention exhibits no volume shrinkage in high-temperature environments. The composite of the present invention eliminates the need for high-temperature calcination during the powder modification process. Instead, it leverages the synergy between the special components to extend the effects of mechanical grinding from traditional "activity stimulation" to "high-temperature stable phase induction." This combines high efficiency with low energy consumption, achieving low-cost, high-value resource utilization of industrial solid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 The following are images of activated composite powder samples prepared in Examples 1 to 9.

[0021] Figure 2 The XRD pattern of the activated composite powder prepared in Example 1 below.

[0022] Figure 3 The compressive strength test diagrams of the following Examples 1 to 9 are shown.

[0023] Figure 4 This is a test chart of the linear shrinkage and expansion ratio of the following Example 1. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present invention only and are not intended to limit the scope of the invention. The experimental methods in the following examples, for which specific conditions are not specified, are generally performed under conventional conditions or as recommended by the manufacturer.

[0025] Unless otherwise defined, all professional and scientific terms used in the present invention have the same meanings as those familiar to those skilled in the art. The reagents and raw materials used in the present invention can be purchased through conventional channels. Unless otherwise specified, the reagents and raw materials used in the present invention are used in accordance with conventional methods in the art or in accordance with the product instructions.

[0026] In addition, any methods and materials similar or equivalent to those described herein can be applied to the method of the present invention. The technical solution of the present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] A method for preparing a high-temperature resistant cement-based grouting material comprises the following steps:

[0029] (1) Gold tailings powder, spodumene powder, sillimanite powder, nanocrystalline seeds ( ) were mixed in a mass ratio of 5:2.5:2.4:0.1 and placed in a high-energy ball mill. Water (50% of the mass of the mixed powder) was then added and ball milled at a speed of 1000 r / min for 8 hours. After discharge, the material was dried at 100°C for 8 hours to obtain an activated composite powder (such as Figure 1 The XRD test results are shown as follows Figure 2 shown.

[0030] (2) The raw materials were weighed in the following proportions by mass: 70% of ordinary Portland cement (PO 42.5), 25% of the activated composite powder of this embodiment, 5% of a functional admixture (composed of 0.8% of a polycarboxylate water reducer, 0.1% of a composite retarder (sodium gluconate + citric acid, mass ratio 3:1), and 4.1% of a magnesium oxide expansion agent), and 0.6 times the total mass of the Portland cement and the activated composite powder in mixing water. The Portland cement and the activated composite powder were poured into a mixer and dry-mixed for 3 minutes. The functional admixture and mixing water were then added and stirred for 2 minutes to obtain a grouting material.

[0031] Performance test: 1. According to the national standard "Test method for strength of cement mortar (ISO method)" (GB / T 17671-2021), the grouting material prepared in this embodiment was made into a test piece and put into the site for curing. The curing temperature was set to 80°C. After curing for 28 days, the compressive strength of the test piece was tested (such as Figure 3 2. The linear shrinkage and expansion rate of the test specimens made of the grouting material prepared in this embodiment was tested according to the national standard "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete" (GB / T 50082-2024). The bellows device containing the grouting material and sealed at both ends was placed in a constant temperature water bath at 80°C for curing (as shown). Figure 4 After 28 days of curing, the bellows were removed and the linear deformation relative to the initial state was measured using a displacement sensor. The linear shrinkage / swell ratio was calculated. The results were as follows: compressive strength = 23.8 MPa, linear shrinkage / swell ratio = 0.041%. Positive values indicate volume expansion.

[0032] Example 2

[0033] A method for preparing a high-temperature resistant cement-based grouting material comprises the following steps:

[0034] (1) Gold tailings powder, spodumene powder, sillimanite powder, nanocrystalline seeds ( ) were mixed in a mass ratio of 4.5:2.5:2.8:0.2 and placed in a high-energy ball mill. Water (50% of the mass of the mixed powder) was then added and ball milled at 800 r / min for 6 hours. The material was dried at 100°C for 8 hours to obtain an activated composite powder (such as Figure 1 as shown), and keep it as a standby.

[0035] (2) Weigh the following raw materials by mass: 50% ordinary Portland cement (PO 42.5), 45% of the activated composite powder of this embodiment, 5% of a functional admixture (composed of 1.0% polycarboxylate water reducer, 0.1% sodium tripolyphosphate, and 3.9% magnesium oxide expansion agent), and 0.5 times the total mass of the Portland cement and the activated composite powder in mixing water. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 minutes. Then, add the functional admixture and mixing water and stir for 2 minutes to obtain a grouting material.

[0036] Performance test: The compressive strength of the grouting material prepared in this embodiment was tested using the same method as in Example 1 (e.g. Figure 3 The results are as follows: compressive strength = 22.4 MPa, linear shrinkage expansion rate = 0.034%, and positive values indicate that volume expansion has occurred.

[0037] Example 3

[0038] A method for preparing a high-temperature resistant cement-based grouting material comprises the following steps:

[0039] (1) Gold tailings powder, spodumene powder, sillimanite powder, nanocrystalline seeds ( ) were mixed in a mass ratio of 4:1.5:1.5:0.3 and placed in a high-energy ball mill. Triethanolamine (0.1% of the mass of the mixed powder) and water (40% of the mass of the mixed powder) were added. The mixture was then ball milled at 1200 r / min for 8 hours. The material was dried at 100°C for 10 hours to obtain an activated composite powder (such as Figure 1 as shown), and keep it as a standby.

[0040] (2) Weigh the following raw materials by mass: 70% ordinary Portland cement (PO 42.5), 27% of the activated composite powder of this embodiment, 3% of a functional admixture (composed of 0.5% polycarboxylate water reducer, 0.05% sodium tripolyphosphate, and 2.45% magnesium oxide expansion agent), and 0.8 times the total mass of the Portland cement and the activated composite powder in mixing water. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 minutes. Then, add the functional admixture and mixing water and stir for 2 minutes to obtain a grouting material.

[0041] Performance test: The compressive strength of the grouting material prepared in this embodiment was tested using the same method as in Example 1 (e.g. Figure 3 The results are as follows: compressive strength = 18.8MPa, linear shrinkage expansion rate = 0.026%, and positive values indicate that volume expansion has occurred.

[0042] Example 4

[0043] A method for preparing a high-temperature resistant cement-based grouting material comprises the following steps:

[0044] (1) Gold tailings powder, spodumene powder, sillimanite powder, nanocrystalline seeds ( ) were mixed in a mass ratio of 6:3:3:0.5 and placed in a high-energy ball mill. Triisopropanolamine (0.05% of the mass of the mixed powder) and water (50% of the mass of the mixed powder) were added. The mixture was then ball milled at 1100 r / min for 6.5 hours. The material was dried at 80°C for 9.5 hours to obtain an activated composite powder (such as Figure 1 as shown), and keep it as a standby.

[0045] (2) Weigh the following raw materials by mass: 60% ordinary Portland cement (PO 42.5), 32% of the activated composite powder of this embodiment, 8% of a functional admixture (composed of 1.3% polycarboxylate water reducer, 0.2% borax, and 6.5% magnesium oxide expansion agent), and 0.5 times the total mass of the Portland cement and the activated composite powder in mixing water. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 minutes. Then, add the functional admixture and mixing water and stir for 2 minutes to obtain a grouting material.

[0046] Performance test: The compressive strength of the grouting material prepared in this embodiment was tested using the same method as in Example 1 (e.g. Figure 3 The results are as follows: compressive strength = 26.6MPa, linear shrinkage expansion rate = 0.052%, and positive values indicate that volume expansion has occurred.

[0047] Example 5

[0048] A method for preparing a high-temperature resistant cement-based grouting material comprises the following steps:

[0049] (1) Mix gold tailings powder, spodumene powder and sillimanite powder in a mass ratio of 5:2.5:2.4 and place in a high-energy ball mill. Then add 50% water of the mass of the mixed powder and ball mill at a speed of 1000 r / min for 8 hours. After discharge, dry at 100℃ for 8 hours to obtain activated composite powder (such as Figure 1 as shown), and keep it as a standby.

[0050] (2) The raw materials were weighed in the following proportions by mass: 70% of ordinary Portland cement (PO 42.5), 25% of the activated composite powder of this embodiment, 5% of a functional admixture (composed of 0.8% of a polycarboxylate water reducer, 0.1% of a composite retarder (sodium gluconate + citric acid, mass ratio 3:1), and 4.1% of a magnesium oxide expansion agent), and 0.6 times the total mass of the Portland cement and the activated composite powder in mixing water. The Portland cement and the activated composite powder were poured into a mixer and dry-mixed for 3 minutes. The functional admixture and mixing water were then added and stirred for 2 minutes to obtain a grouting material.

[0051] Performance test: The compressive strength of the grouting material prepared in this embodiment was tested using the same method as in Example 1 (e.g. Figure 3 The results are as follows: compressive strength = 18.3MPa, linear shrinkage expansion rate = 0.013%, and positive values indicate that volume expansion has occurred.

[0052] Example 6

[0053] A method for preparing a high-temperature resistant cement-based grouting material comprises the following steps:

[0054] (1) Mix gold tailings powder, spodumene powder, sillimanite powder and nano calcium carbonate in a mass ratio of 4.5:2.5:2.8:0.2 and place in a high energy ball mill. Then add 40% water of the mass of the mixed powder and ball mill at 800 r / min for 6 hours. After discharge, dry at 100 ° C for 8 hours to obtain activated composite powder (such as Figure 1 as shown), and keep it as a standby.

[0055] (2) Weigh the following raw materials by mass: 50% ordinary Portland cement (PO 42.5), 45% of the activated composite powder of this embodiment, 5% of a functional admixture (composed of 1.0% polycarboxylate water reducer, 0.1% sodium tripolyphosphate, and 3.9% magnesium oxide expansion agent), and 0.5 times the total mass of the Portland cement and the activated composite powder in mixing water. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 minutes. Then, add the functional admixture and mixing water and stir for 2 minutes to obtain a grouting material.

[0056] Performance test: The compressive strength of the grouting material prepared in this embodiment was tested using the same method as in Example 1 (e.g. Figure 3 The results are as follows: compressive strength = 18.4MPa, linear shrinkage expansion rate = -0.018%, and negative values indicate that volume shrinkage has occurred.

[0057] Example 7

[0058] A method for preparing a high-temperature resistant cement-based grouting material comprises the following steps:

[0059] (1) Gold tailings powder, sillimanite powder, nanocrystalline seeds ( ) were mixed in a mass ratio of 4:1.5:0.3 and placed in a high-energy ball mill. Triethanolamine (0.1% of the mass of the mixed powder) and water (50% of the mass of the mixed powder) were added. The mixture was then ball milled at 1200 r / min for 8 hours. The material was dried at 100°C for 10 hours to obtain an activated composite powder (such as Figure 1 as shown), and keep it as a standby.

[0060] (2) Weigh the following raw materials by mass: 70% ordinary Portland cement (PO 42.5), 27% of the activated composite powder of this embodiment, 3% of a functional admixture (composed of 0.5% polycarboxylate water reducer, 0.05% sodium tripolyphosphate, and 2.45% magnesium oxide expansion agent), and 0.8 times the total mass of the Portland cement and the activated composite powder in mixing water. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 minutes. Then, add the functional admixture and mixing water and stir for 2 minutes to obtain a grouting material.

[0061] Performance test: The compressive strength of the grouting material prepared in this embodiment was tested using the same method as in Example 1 (e.g. Figure 3 The results are as follows: compressive strength = 14.3MPa, linear shrinkage expansion rate = -0.039%, and negative values indicate that volume shrinkage has occurred.

[0062] Example 8

[0063] A method for preparing a high-temperature resistant cement-based grouting material comprises the following steps:

[0064] (1) Gold tailings powder, spodumene powder, nanocrystalline seeds ( ) were mixed in a mass ratio of 4.5:2.5:0.2 and placed in a high-energy ball mill. Then, 40% of the mass of the mixed powder was added and ball milled at 800 r / min for 6 hours. After discharge, the material was dried at 100 ° C for 8 hours to obtain an activated composite powder (such as Figure 1 as shown), and keep it as a standby.

[0065] (2) Weigh the following raw materials by mass: 50% ordinary Portland cement (PO 42.5), 45% of the activated composite powder of this embodiment, 5% of a functional admixture (composed of 1.0% polycarboxylate water reducer, 0.1% sodium tripolyphosphate, and 3.9% magnesium oxide expansion agent), and 0.5 times the total mass of the Portland cement and the activated composite powder in mixing water. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 minutes. Then, add the functional admixture and mixing water and stir for 2 minutes to obtain a grouting material.

[0066] Performance test: The compressive strength of the grouting material prepared in this embodiment was tested using the same method as in Example 1 (e.g. Figure 3 The results are as follows: compressive strength = 15.6MPa, linear shrinkage expansion rate = -0.027%, and negative values indicate that volume shrinkage has occurred.

[0067] Example 9

[0068] A method for preparing a high-temperature resistant cement-based grouting material comprises the following steps:

[0069] (1) According to gold tailings powder, spodumene powder, sillimanite powder, nanocrystalline seeds ( ) with a mass ratio of 6:3:3:0.5. The raw materials were weighed separately. The gold tailings powder, spodumene powder, and sillimanite powder were then placed in a high-energy ball mill. Triisopropanolamine, a grinding aid, was added at a rate of 0.05% of the mass of the powder in the ball mill. Water (50% of the mass of the powder) was added and ball milled at a speed of 1100 r / min for 6.5 hours. The three powders obtained after discharge were dried at 80°C for 9.5 hours. The three powders were then mixed with the nanocrystal seeds ( ) and then stirred evenly to obtain activated composite powder (such as Figure 1 as shown), and keep it as a standby.

[0070] (2) Weigh the following raw materials by mass: 60% ordinary Portland cement (PO 42.5), 32% of the activated composite powder of this embodiment, 8% of a functional admixture (composed of 1.3% polycarboxylate water reducer, 0.2% borax, and 6.5% magnesium oxide expansion agent), and 0.5 times the total mass of the Portland cement and the activated composite powder in mixing water. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 minutes. Then, add the functional admixture and mixing water and stir for 2 minutes to obtain a grouting material.

[0071] Performance test: The compressive strength of the grouting material prepared in this embodiment was tested using the same method as in Example 1 (e.g. Figure 3 The results are as follows: compressive strength = 12.2 MPa, linear shrinkage expansion rate = -0.015%, and negative values indicate that volume shrinkage has occurred.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A high temperature resistant cement-based grouting material, characterized in that: The invention comprises the following components by mass fraction: 50-70% of Portland cement, 25-45% of activated composite powder, 3-8% of functional admixture, and 0.5-0.8 times the total mass of the Portland cement and the activated composite powder as mixing water; wherein the activated composite powder is obtained by grinding gold tailings powder, spodumene, sillimanite and nanocrystalline zirconium dioxide.

2. The high temperature resistant cement-based grouting material according to claim 1, characterized in that: The functional admixture includes at least one of a water reducer, a retarder, and an expansion agent; Alternatively, the ratio of the water reducer, retarder and expansion agent is 0.5-1.3%: 0.05-0.2%: 2.45-6.5%; Alternatively, the water reducer comprises at least one of a polycarboxylate water reducer, a naphthalene water reducer, and a lignin sulfonate water reducer; Alternatively, the retarder comprises at least one of sodium tripolyphosphate, borax, citric acid, gluconic acid, and tartaric acid; Alternatively, the expansion agent includes at least one of magnesium oxide, calcium oxide, and calcium sulfoaluminate.

3. The high temperature resistant cement-based grouting material according to claim 1, characterized in that: The mass ratio of the gold tailings powder, spodumene, sillimanite and nanocrystalline zirconium dioxide is 4-6: 1.5-3: 1.5-3: 0.1-0.

5.

4. The high temperature resistant cement-based grouting material according to claim 1, characterized in that: The activated composite powder is prepared by the following method: adding water to a mixed powder formed by the gold tailings powder, spodumene, sillimanite and nanocrystalline zirconium dioxide, wet grinding the mixed powder, and then drying the mixed powder to obtain the activated composite powder.

5. The high temperature resistant cement-based grouting material according to claim 4, characterized in that: The water accounts for 40-50% of the mass of the mixed powder.

6. The high temperature resistant cement-based grouting material according to claim 5, characterized in that: The mixed powder further comprises 0.05-0.1% by weight of a grinding aid; or the grinding aid comprises at least one of triethanolamine, triisopropanolamine, ethylene glycol, and diethylene glycol.

7. The high temperature resistant cement-based grouting material according to claim 5, characterized in that: The grinding speed is 800-1200 r / min, and the grinding time is 6-8 hours.

8. The high temperature resistant cement-based grouting material according to claim 5, characterized in that: The drying temperature is 80-100° C., and the drying time is 8-10 hours.

9. The method for preparing the high temperature resistant cement-based grouting material according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: mixing the silicate cement and the activated composite powder, then adding the functional admixture and mixing water and stirring evenly to obtain the product.

10. Use of the high-temperature resistant cement-based grouting material according to any one of claims 1 to 8, or the high-temperature resistant cement-based grouting material obtained by the preparation method according to claim 9 in the fields of transportation, mining or water conservancy.

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