High-temperature-resistant cement-based grouting material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of cement-based grouting materials, and particularly discloses a high-temperature-resistant cement-based grouting material as well as a preparation method and application thereof. The grouting material comprises the following components in percentage by mass: 50-70% of Portland cement, 25-45% of activated composite powder, 3-8% of a functional additive and mixing water which is 0.5-0.8 time of the mass of the Portland cement. Wherein the activated composite powder is obtained by grinding gold tailing powder, spodumene, sillimanite and nano crystal seed zirconium dioxide. The grouting material disclosed by the 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 particularly relates to a high-temperature resistant cement-based grouting material, a preparation method thereof and an application thereof. Background Art

[0002] Disclosing the information of this background art section is only intended to increase the understanding of the overall background of the present invention, and is not necessarily regarded as an admission or an implication in any form that this information constitutes the prior art already known to those of ordinary skill in the art.

[0003] With the implementation of national strategies such as "Strengthening the Country in Transportation" and "Strengthening the Country in Energy", the construction of underground projects in the fields of transportation, mines, water conservancy, etc. in China is moving towards the deep earth with extremely complex geological conditions. For example: The designed well depth of the Sanshandao auxiliary shaft, the deepest mine shaft in Asia under construction, reaches 1915 m, the maximum buried depth of the Grand Canyon Tunnel on the Emeishan-Hanzhong Expressway is 1944 m, and the maximum buried depth of the water conveyance tunnel of the Hanjiang-to-Weihe River Diversion Project crossing the Qinling Mountains in China has reached 2012 m.

[0004] With the increase of the buried depth of underground projects, the temperature increases at a temperature gradient of about 3℃ / 100m, and the engineering construction faces the threat of high geothermal extreme environments, and the high geothermal problem becomes prominent. In addition, the occurrence environment of deep rock masses is complex, with characteristics such as high fissure water pressure and strong engineering disturbance, making high-temperature fissure water disaster an important geological disaster in the construction of deep-buried underground projects, seriously threatening the safety of engineering construction. Controlling the water disaster of high-temperature water-rich fractured rock masses has become a major requirement for ensuring the safe construction of deep-buried underground projects in China. Grouting is the most commonly used method for treating the water disaster of high-temperature water-rich fractured rock masses. Through grouting, the rock mass fissures can be effectively filled and cemented, and the fissure water channels can be blocked to avoid the occurrence of sudden water inrush accidents.

[0005] Ordinary Portland cement-based materials are the most widely used grouting materials at present. After solidification and hardening, they can form a solid cement stone body to fill and block cracks. However, in a high-temperature environment, this material will have problems such as a significant decrease in strength, volume shrinkage, and deterioration of durability. The specific manifestations are as follows: The hydration product ettringite in the cement stone begins to decompose at 60-80℃, resulting in a loose structure of the cement stone. At higher temperatures, the hydration product C-S-H gel will cause irreversible strength loss after dehydration. In addition, due to the high-temperature environment accelerating the evaporation of free water in the pores of the cement stone body, the desorption of adsorbed water between colloidal particles, and the decomposition of the expansive hydration product ettringite, the volume shrinkage phenomenon of the cement stone body is more significant. The internal stress generated by volume shrinkage causes micro-cracks to appear inside the cement stone body and at the slurry-rock interface, forming potential water-conducting channels, which not only affect the water-blocking effect of the cement stone body, but also provide a seepage path for erosive media, resulting in a significant reduction in the durability of the grout stone body.

[0006] The current solutions mainly include: adding mineral admixtures such as silica fume and slag powder, adding temperature regulating materials such as zirconium tungstate and ceramic powder, adding high-temperature strengthening materials such as graphene, etc. However, the production energy consumption of mineral admixtures such as silica fume and slag powder is relatively high, and the heavy metal solidification effect of some industrial waste residues (such as dechlorinated fly ash) still needs to be verified. The preparation processes of zirconium tungstate and low-expansion ceramic materials are complex and costly, making it difficult to apply them on a large scale. Although graphene can inhibit the coarsening of pore structure in cement stone to a certain extent, there is still an obvious phenomenon of strength attenuation at high temperatures, and it cannot well improve 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, its preparation method and application, which have 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 of all, the present invention provides a high-temperature resistant cement-based grouting material, which, by mass fraction, comprises the following components: 50-70% of Portland cement, 25-45% of activated composite powder, 3-8% of functional admixture, and also mixing water with a mass 0.5-0.8 times that of the total mass of the Portland cement and the activated composite powder. Among them: the activated composite powder is obtained by grinding gold tailings powder, spodumene, sillimanite and nanocrystalline zirconia (ZrO2).

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

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

[0011] Furthermore, the activated composite powder is prepared by the following method: adding water to the mixed powder formed by the gold tailings powder, spodumene, sillimanite and nanocrystalline zirconia for wet grinding, and then drying to obtain it. Optionally, the water is 40-50% of the mass of the mixed powder.

[0012] Furthermore, the mixed powder also includes a grinding aid accounting for 0.05-0.1% of its mass. Optionally, the grinding aid includes at least one of triethanolamine, triisopropanolamine, ethylene glycol, diethylene glycol, etc., which is beneficial to reducing agglomeration and enhancing the particle collision efficiency, thereby promoting the reaction between components.

[0013] Furthermore, the rotation speed of the grinding 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 method for preparing the high-temperature resistant cement-based grouting material, which includes the following steps: mixing the portland cement and the activated composite powder evenly, and then adding the functional admixture and mixing water and stirring evenly to obtain the product.

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

[0017] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects: In the cement-based grouting material of the present invention, an activated composite powder treated specially is added, which effectively improves the strength of the slurry stone body in a high-temperature environment and has the function of resisting the shrinkage of the cement stone body. The reason is that: during the mechanical grinding process, the local high temperature (instantaneous temperature can reach hundreds of degrees Celsius or more) and high pressure generated by particle collisions in the powder form a micro-reaction environment, in which: the Al2O3·SiO2 in the sillimanite is locally transformed into highly active mullite crystal embryos under the above action (). The Li2O·Al2O3·4SiO2 mineral phase in the spodumene forms hydroxyl-containing products containing Al and Si on the surface and releases Li⁺ ions under the above action. And part of the dissociated Li + ions dissolve in the water added during wet grinding to form an alkaline environment, which promotes the dissolution of active components (HSiO3 - 、[Al(OH)4] - )in the gold tailings powder during the grinding process. And the released Li +The active components leached from the gold tailings powder further react to form an amorphous lithium aluminosilicate colloid network structure (). The nanocrystalline seed zirconia (ZrO2) on the one hand serves as a nucleation site to adsorb the active components in the gold tailings powder and the Li⁺ released by the spodumene during the above process, thereby reducing the nucleation barrier and guiding the directional growth of the metastable lithium zirconate solid solution through the driving force of surface energy (), which helps to hinder crack propagation and improve the material strength. On the other hand, the ZrO2 can undergo a polymorphic transformation (from monoclinic phase to tetragonal phase) under grinding stress, and the accompanying volume change is conducive to further inducing lattice distortion of the powder particles, thereby promoting the above reactions. The mullite crystal embryos formed through the above reactions can serve as "rigid support points" as a high-temperature resistant skeleton structure during the cement hydration process, hindering the volume shrinkage and crack propagation of the stone body at high temperatures. The lithium aluminosilicate colloid network can effectively fill the pores in the cement stone structure formed by the grouting material, avoiding volume shrinkage and structural deterioration caused by the evaporation of pore water. The lithium zirconate solid solution, as a high-temperature resistant ductile phase, can effectively improve the ability of the grouting material to resist cracking caused by thermal stress, thereby improving the high-temperature resistance of the grouting material. Moreover, the grouting material of the present invention also has the characteristic of no volume shrinkage of the slurry under high-temperature environment. In the process of powder modification of the present invention, high-temperature calcination is not required. Instead, the synergistic effect between special components is used to expand the effect of mechanical grinding from traditional "activity excitation" to "high-temperature stable phase induction", with both high efficiency and low energy consumption advantages, realizing the low-cost and high-value resource utilization of industrial solid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0019] Figure 1 Graphs of the activated composite powder samples prepared for Examples 1-9 below.

[0020] Figure 2 XRD pattern of the activated composite powder prepared for Example 1 below.

[0021] Figure 3 Graphs of the compressive strength tests for Examples 1-9 below.

[0022] Figure 4 Graph of the linear shrinkage and expansion rate test for Example 1 below. DETAILED DESCRIPTION OF THE INVENTION

[0023] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. The experimental methods without specific conditions noted in the following embodiments are generally carried out under conventional conditions or according to the conditions recommended by the manufacturers.

[0024] Unless otherwise defined, all professional and scientific terms used in the present invention have the same meaning as those familiar to persons skilled in the art. The reagents or raw materials used in the present invention can all be obtained by conventional means of purchase. Unless otherwise specified, the reagents or raw materials used in the present invention are used in accordance with the conventional methods in the art or in accordance with the product instructions.

[0025] In addition, any methods and materials similar or equivalent to the described content can be applied to the method of the present invention. The technical solution of the present invention will be further described below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0026] Example 1 A preparation method of a high-temperature resistant cement-based grouting material comprises the following steps: (1) Mix gold tailings powder, spodumene powder, sillimanite powder, and nanocrystal seeds (ZrO2) according to a mass ratio of 5:2.5:2.4:0.1, then place the mixture in a high-energy ball mill, and then add water accounting for 50% of the mass of the obtained mixed powder. Ball mill at a rotation speed of 1000 r / min for 8 hours. After discharging, dry at 100 °C for 8 hours to obtain an activated composite powder (as shown in Figure 1 ), and its XRD test results are as shown in Figure 2 .

[0027] (2) Weigh each raw material according to the following proportions by mass fraction: 70% of ordinary Portland cement (PO 42.5), 25% of the activated composite powder of this embodiment, 5% of functional admixtures (composed of 0.8% of polycarboxylate water reducer, 0.1% of composite retarder (sodium gluconate + citric acid, mass ratio 3:1), and 4.1% of magnesium oxide expansive agent), and also include mixing water 0.6 times the total mass of the Portland cement and the activated composite powder. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 min, then add the functional admixtures and the mixing water and stir for 2 min to obtain the grouting material.

[0028] Performance test: 1. According to the national standard "Test Method for Strength of Cement Mortar (ISO Method)" (GB / T 17671-2021), make specimens from the grouting material prepared in this embodiment and cure them on site. The curing temperature is set at 80 °C, and the compressive strength of the specimens is tested after curing for 28 days (as shown in Figure 3as shown). 2. According to the national standard "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete" (GB / T 50082-2024), test the linear shrinkage and expansion rate of the specimens made of the grouting material prepared in this example. Put the corrugated pipe device filled with the grouting material and sealed at both ends into a constant temperature water bath at 80 °C for curing (as Figure 4 shown). After curing to the age of 28 days, take out the corrugated pipe device, use a displacement sensor to measure the linear deformation relative to the initial state, and calculate the linear shrinkage and expansion rate. The results are as follows: compressive strength = 23.8 MPa, linear shrinkage and expansion rate = 0.041%, and a positive value indicates that volume expansion has occurred.

[0029] Example 2 A preparation method of a high-temperature resistant cement-based grouting material includes the following steps: (1) Mix gold tailings powder, spodumene powder, sillimanite powder, and nanocrystal seeds (ZrO2) according to a mass ratio of 4.5:2.5:2.8:0.2, place them in a high-energy ball mill, then add water accounting for 50% of the mass of the obtained mixed powder, and ball mill at a speed of 800 r / min for 6 hours. After discharging, dry at 100 °C for 8 hours to obtain an activated composite powder (as Figure 1 shown), and set aside.

[0030] (2) Weigh each raw material according to the following ratio by mass fraction: 50% of ordinary Portland cement (PO 42.5), 45% of the activated composite powder of this example, 5% of functional admixtures (composed of 1.0% polycarboxylate water reducer, 0.1% sodium tripolyphosphate, and 3.9% magnesium oxide expansive agent), and also include mixing water that is 0.5 times the total mass of the Portland cement and the activated composite powder. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 min, then add the functional admixtures and the mixing water and stir for 2 min to obtain the grouting material.

[0031] Performance test: Use the same method as in Example 1 above to test the compressive strength (as Figure 3 shown) and linear shrinkage and expansion rate of the grouting material prepared in this example. The results are as follows: compressive strength = 22.4 MPa, linear shrinkage and expansion rate = 0.034%, and a positive value indicates that volume expansion has occurred.

[0032] Example 3 A preparation method of a high-temperature resistant cement-based grouting material includes the following steps: (1) Mix gold tailings powder, spodumene powder, sillimanite powder, and nanocrystalline seeds (ZrO₂) in a mass ratio of 4:1.5:1.5:0.3, place them in a high-energy ball mill, and then add triethanolamine as a grinding aid accounting for 0.1% of the mass of the obtained mixed powder and water accounting for 40% of the mass of the mixed powder. Then, carry out wet ball milling at a speed of 1200 r / min for 8 hours. After discharging, dry at 100 °C for 10 hours to obtain an activated composite powder (as shown in Figure 1 ), and set it aside for later use.

[0033] (2) By mass fraction, weigh each raw material according to the following ratio: ordinary Portland cement (PO 42.5) 70%, the activated composite powder of this example 27%, functional admixture 3% (composed of 0.5% polycarboxylate superplasticizer, 0.05% sodium tripolyphosphate, and 2.45% magnesium oxide expansive agent), and also include mixing water 0.8 times the total mass of the Portland cement and the activated composite powder. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 min, then add the functional admixture and the mixing water and stir for 2 min to obtain the grouting material.

[0034] Performance test: Use the same method as in Example 1 above to test the compressive strength (as shown in Figure 3 ) and linear shrinkage and expansion rate of the grouting material prepared in this example. The results are as follows: compressive strength = 18.8 MPa, linear shrinkage and expansion rate = 0.026%, and a positive value indicates that a volume expansion phenomenon has occurred.

[0035] Example 4 A preparation method of a high-temperature resistant cement-based grouting material includes the following steps: (1) Mix gold tailings powder, spodumene powder, sillimanite powder, and nanocrystalline seeds (ZrO₂) in a mass ratio of 6:3:3:0.5, place them in a high-energy ball mill, and then add triisopropanolamine as a grinding aid accounting for 0.05% of the mass of the obtained mixed powder and water accounting for 50% of the mass of the mixed powder. Then, carry out wet ball milling at a speed of 1100 r / min for 6.5 hours. After discharging, dry at 80 °C for 9.5 hours to obtain an activated composite powder (as shown in Figure 1 ), and set it aside for later use.

[0036] (2) By mass fraction, weigh each raw material according to the following ratio: ordinary Portland cement (PO 42.5) 60%, the activated composite powder of this example 32%, functional admixture 8% (composed of 1.3% polycarboxylate superplasticizer, 0.2% borax, and 6.5% magnesium oxide expansive agent), and also include mixing water 0.5 times the total mass of the Portland cement and the activated composite powder. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 min, then add the functional admixture and the mixing water and stir for 2 min to obtain the grouting material.

[0037] Performance test: The compressive strength (as shown in Figure 3 the following) and linear shrinkage and expansion rate of the grouting material prepared in this example were tested by the same method as in Example 1 above. The results are as follows: Compressive strength = 26.6 MPa, linear shrinkage and expansion rate = 0.052%. A positive value indicates that volume expansion occurred.

[0038] Example 5 A preparation method of a high-temperature resistant cement-based grouting material includes the following steps: (1) Mix gold tailings powder, spodumene powder, and sillimanite powder in a mass ratio of 5:2.5:2.4, place them in a high-energy ball mill, then add water accounting for 50% of the mass of the obtained mixed powder, and ball mill for 8 hours at a rotation speed of 1000 r / min. After discharging, dry at 100 °C for 8 hours to obtain an activated composite powder (as shown in Figure 1 the following), and set it aside.

[0039] (2) Weigh each raw material according to the following proportions by mass fraction: ordinary Portland cement (PO 42.5) 70%, the activated composite powder of this example 25%, functional admixture 5% (composed of 0.8% polycarboxylate water reducer, 0.1% composite retarder (sodium gluconate + citric acid, mass ratio 3:1), 4.1% magnesium oxide expansion agent), and also include mixing water 0.6 times the total mass of the Portland cement and the activated composite powder. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 min, then add the functional admixture and the mixing water and stir for 2 min to obtain the grouting material.

[0040] Performance test: The compressive strength (as shown in Figure 3 the following) and linear shrinkage and expansion rate of the grouting material prepared in this example were tested by the same method as in Example 1 above. The results are as follows: Compressive strength = 18.3 MPa, linear shrinkage and expansion rate = 0.013%. A positive value indicates that volume expansion occurred.

[0041] Example 6 A preparation method of a high-temperature resistant cement-based grouting material includes the following steps: (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, place them in a high-energy ball mill, then add water accounting for 40% of the mass of the obtained mixed powder, and ball mill for 6 hours at a rotation speed of 800 r / min. After discharging, dry at 100 °C for 8 hours to obtain an activated composite powder (as shown in Figure 1 the following), and set it aside.

[0042] (2) Weigh each raw material according to the following proportions by mass fraction: ordinary Portland cement (PO 42.5) 50%, the activated composite powder of this embodiment 45%, functional admixture 5% (composed of 1.0% polycarboxylate water reducer, 0.1% sodium tripolyphosphate, and 3.9% magnesium oxide expansive agent), and also include mixing water with a mass 0.5 times that of the total mass of the Portland cement and the activated composite powder. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 minutes, then add the functional admixture and the mixing water and stir for 2 minutes to obtain the grouting material.

[0043] Performance test: Use the same method as in Example 1 above to test the compressive strength (as Figure 3 shown) and linear shrinkage and expansion rate of the grouting material prepared in this embodiment. The results are as follows: compressive strength = 18.4 MPa, linear shrinkage and expansion rate = -0.018%, and the negative value indicates that volume shrinkage has occurred.

[0044] Example 7 A preparation method of a high-temperature resistant cement-based grouting material, comprising the following steps: (1) Mix gold tailings powder, sillimanite powder, and nanocrystalline seeds (ZrO2) according to a mass ratio of 4:1.5:0.3, place them in a high-energy ball mill, and then add 0.1% triethanolamine as a grinding aid based on the mass of the obtained mixed powder and 50% water based on the mass of the mixed powder. Then ball mill at a speed of 1200 r / min for 8 hours. After discharging, dry at 100 °C for 10 hours to obtain the activated composite powder (as Figure 1 shown), and set aside.

[0045] (2) Weigh each raw material according to the following proportions by mass fraction: ordinary Portland cement (PO 42.5) 70%, the activated composite powder of this embodiment 27%, functional admixture 3% (composed of 0.5% polycarboxylate water reducer, 0.05% sodium tripolyphosphate, and 2.45% magnesium oxide expansive agent), and also include mixing water with a mass 0.8 times that of the total mass of the Portland cement and the activated composite powder. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 minutes, then add the functional admixture and the mixing water and stir for 2 minutes to obtain the grouting material.

[0046] Performance test: Use the same method as in Example 1 above to test the compressive strength (as Figure 3 shown) and linear shrinkage and expansion rate of the grouting material prepared in this embodiment. The results are as follows: compressive strength = 14.3 MPa, linear shrinkage and expansion rate = -0.039%, and the negative value indicates that volume shrinkage has occurred.

[0047] Example 8 A preparation method of a high-temperature resistant cement-based grouting material, comprising the following steps: (1) Mix gold tailings powder, spodumene powder, and nanocrystal seeds (ZrO2) in a mass ratio of 4.5:2.5:0.2, place them in a high-energy ball mill, then add water accounting for 40% of the mass of the obtained mixed powder, and ball mill for 6 hours at a rotation speed of 800 r / min. After discharging, dry at 100 °C for 8 hours to obtain an activated composite powder (as Figure 1 shown), and set aside.

[0048] (2) Weigh each raw material according to the following ratio by mass fraction: ordinary Portland cement (PO 42.5) 50%, the activated composite powder of this example 45%, functional admixture 5% (composed of 1.0% polycarboxylate superplasticizer, 0.1% sodium tripolyphosphate, and 3.9% magnesia expansion agent), and also include mixing water with a mass 0.5 times that of the total mass of the Portland cement and the activated composite powder. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 min, then add the functional admixture and the mixing water and stir for 2 min to obtain the grouting material.

[0049] Performance test: Use the same method as in Example 1 above to test the compressive strength (as Figure 3 shown) and linear shrinkage expansion rate of the grouting material prepared in this example. The results are as follows: compressive strength = 15.6 MPa, linear shrinkage expansion rate = -0.027%, and the negative value indicates that volume shrinkage has occurred.

[0050] Example 9 A preparation method of a high-temperature resistant cement-based grouting material, comprising the following steps: (1) Weigh each raw material according to the mass ratio of gold tailings powder, spodumene powder, sillimanite powder, and nanocrystal seeds (ZrO2) of 6:3:3:0.5. Then place the gold tailings powder, spodumene powder, and sillimanite powder in a high-energy ball mill respectively, and then add 0.05% of the grinding aid triisopropanolamine based on the mass of the powder in the ball mill and add water (the addition amount is 50% of the mass of the powder) and ball mill for 6.5 hours at a rotation speed of 1100 r / min. Dry the three powders obtained after discharging at 80 °C for 9.5 hours respectively, and then mix these three powders with the nanocrystal seeds (ZrO2) and stir evenly to obtain an activated composite powder (as Figure 1 shown), and set aside.

[0051] (2) Weigh each raw material according to the following proportions by mass fraction: ordinary Portland cement (PO 42.5) 60%, the activated composite powder of this example 32%, functional admixture 8% (composed of 1.3% polycarboxylate superplasticizer, 0.2% borax, and 6.5% magnesium oxide expansive agent), and also include mixing water that is 0.5 times the total mass of the Portland cement and the activated composite powder. Pour the Portland cement and the activated composite powder into a mixer and dry mix for 3 minutes, then add the functional admixture and the mixing water and stir for 2 minutes to obtain the grouting material.

[0052] Performance test: Use the same method as in Example 1 above to test the compressive strength (as Figure 3 shown) and linear shrinkage and expansion rate of the grouting material prepared in this example. The results are as follows: compressive strength = 12.2 MPa, linear shrinkage and expansion rate = -0.015%. The negative value indicates that volume shrinkage has occurred.

[0053] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-temperature resistant cement-based grouting material, characterized in that, By mass fraction, it includes the following components: 50 - 70% of portland cement, 25 - 45% of activated composite powder, 3 - 8% of functional admixture, and also includes mixing water in an amount of 0.5 - 0.8 times the total mass of the portland cement and the activated composite powder; wherein: the activated composite powder is obtained by grinding gold tailings powder, spodumene, sillimanite and nanocrystalline zirconia.

2. The high-temperature resistant cement-based grouting material according to claim 1, wherein The functional admixture includes at least one of water reducer, retarder and expansive agent; Alternatively, the ratio of the water reducer, retarder and expansive agent is 0.5 - 1.3%: 0.05 - 0.2%: 2.45 - 6.5%; Alternatively, the water reducer includes at least one of polycarboxylate water reducer, naphthalene-based water reducer, lignosulfonate water reducer; Alternatively, the retarder includes at least one of sodium tripolyphosphate, borax, citric acid, gluconic acid, tartaric acid; Alternatively, the expansive agent includes at least one of magnesium oxide, calcium oxide, 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, nanocrystalline zirconia 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 the mixed powder formed by the gold tailings powder, spodumene, sillimanite and nanocrystalline zirconia for wet grinding, and then drying to obtain it.

5. The high-temperature resistant cement-based grouting material according to claim 4, wherein The water is 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 also includes a grinding aid in an amount of 0.05 - 0.1% of its mass; alternatively, the grinding aid includes at least one of triethanolamine, triisopropanolamine, ethylene glycol, diethylene glycol.

7. The high-temperature resistant cement-based grouting material according to claim 5, characterized in that The rotation speed of the grinding 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 preparation method of the high-temperature resistant cement-based grouting material according to any one of claims 1-8, characterized in that, It includes the following steps: mixing the portland cement and the activated composite powder evenly, and then adding the functional admixture and the mixing water and stirring evenly to obtain it.

10. Application of the high-temperature resistant cement-based grouting material according to any one of claims 1 - 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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