Heat-insulating shrinkage-reducing type water plugging grouting material suitable for high-temperature hot water tunnel and preparation method of heat-insulating shrinkage-reducing type water plugging grouting material

Abstract

The invention belongs to the field of tunnel water plugging grouting materials, and particularly discloses a heat-insulating shrinkage-reducing type water plugging grouting material suitable for a high-temperature hot water tunnel and a preparation method of the heat-insulating shrinkage-reducing type water plugging grouting material. The water plugging and grouting material for the high-temperature hot water tunnel is mainly formed by mixing a multi-element gel composite material component, a heat insulation material component, a reinforcing, toughening and shrinkage reducing component, a water dispersion resisting component, a special admixture for the high-temperature hot water grouting tunnel and the like. The water plugging grouting material for the high-temperature hot water tunnel is suitable for water leakage in the high-temperature hot water tunnel, and has the advantages of good working performance and long-term durability, high material strength, low water permeability coefficient, environmental protection and the like. The setting time of the admixture can be regulated and controlled within 30-5 minutes through the admixture special for the high-temperature hot water tunnel grouting material, and the admixture has good operability so as to meet the construction requirements of actual engineering. Under the synergistic effect of materials with a certain proportioning ratio, the water plugging grouting material has better mechanical properties and durability than a traditional water plugging grouting material, and also has good shrinkage resistance and heat insulation performance. The grouting material disclosed by the invention is good in groutability, easy to inject into tunnel surrounding rock cracks, high in stability, relatively good in later strength and durability, and particularly suitable for water plugging construction of high-temperature hot water tunnels.

Description

Technical Field

[0001] The technology of the present invention belongs to the field of tunnel water plugging grouting materials, and specifically relates to technology and engineering of water plugging grouting materials applied to high-temperature hot water tunnels. It discloses a heat-insulating and shrinkage-reducing water plugging grouting material suitable for high-temperature hot water tunnels and a preparation method thereof. Background Art

[0002] Tunnels play an irreplaceable role in overcoming terrain obstacles such as high mountains and canyons, shortening spatial distances, and improving the operation quality of land transportation projects. As my country's railway construction gradually expands to the southwestern plateau, more and more complex geological conditions such as high temperature hot water and deep burial depth are encountered during tunnel construction. Tunnel construction in plateau areas is easily affected by multiple factors such as geological structure, high temperature hot water, and high temperature hot water, resulting in high temperature hot water leakage problems in tunnel construction in some areas. The high temperature hot water tunnel environment has a huge impact on the physical and mechanical properties and durability of grouting and water plugging materials. At the same time, it also faces problems such as low construction efficiency and poor injectability and reliability of grouting and water plugging. Traditional water plugging grouting materials cannot meet the needs of construction safety and active control of ambient temperature.

[0003] There are many kinds of materials currently used for tunnel water blocking and grouting. Commonly used tunnel grouting materials can be divided into cement-based grouts, chemical grouts, and cement composite chemical grouts. For traditional cement-based grouts, due to their long setting time, they cannot be well used for tunnel dynamic water blocking. Even in a high-temperature hot water environment, its setting time will be greatly shortened, but it is still far from meeting the water blocking requirements. In addition, the stability and durability of chemical grouting grouts cannot be guaranteed under high temperature environments. Traditional cement-water glass double liquid slurry is a representative material of cement composite chemical slurry, which can quickly solidify to play a role in water blocking, and its ratio is simple, easy to operate, and low cost, and has been widely used. However, in high-temperature hot water tunnels, there will be situations such as high temperature, high water volume and high water pressure of the sudden water. The setting time of traditional cement-water glass double liquid slurry is greatly shortened with the increase of temperature. When the temperature rises within a certain range, it will appear instantaneous setting and flash setting, and effective grouting operation cannot be carried out. In addition, the strength shrinkage is serious in the later stage, and the durability is poor. At present, there is a lack of reference materials for grouting and plugging moving water in high-temperature hot water environments. On-site operators only implement it based on their own experience, and the proportion is quite arbitrary. In a high-temperature moving water environment, the solidification time and strength control ability of the slurry are poor, which can easily lead to blockage of the borehole or the slurry is diluted and dispersed by running water, and it cannot play the role of plugging water. There is no effective solution so far. Therefore, it is of great guiding significance to study grouting and plugging materials suitable for high-temperature hot water environments and improve the technical level of grouting and plugging reinforcement of high-temperature hot water tunnels to solve the problem of grouting and plugging water in high-temperature hot water tunnels. Summary of the invention

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a high-temperature tunnel water plugging grouting material with controllable setting time, which meets the injectability requirements and has excellent strength and durability, so that it has the advantages of good physical and mechanical properties, good anti-shrinkage performance, high strength retention rate, high temperature adaptability and excellent stability, and is suitable for the water plugging problem of moving water in high-temperature hot water tunnels.

[0005] The object of the present invention is achieved by the following means:

[0006] A heat-insulating shrinkage-reducing water-plugging grouting material suitable for high-temperature hot water tunnels, wherein the water-plugging grouting material comprises a multi-component cementitious composite material component, a heat-insulating material component, a reinforcing, toughening and shrinkage-reducing component, a water-resistant dispersion component and a special admixture for grouting in high-temperature hot water tunnels, wherein the multi-component cementitious composite material component comprises fast-hardening sulphoaluminate cement, microspheres, silica fume and mineral powder, wherein the mass proportion of sulphoaluminate cement in the multi-component cementitious composite material component is 60% to 85%, the mass proportion of microspheres is 5% to 20%, the mass proportion of silica fume is 5% to 20%, the mass proportion of mineral powder is 5% to 15% %; the thermal insulation material components include glass microspheres and aerogel powders, in which the glass microspheres and aerogel powders can be added alone or in combination, and the amount of the thermal insulation material added is in the range of 0.3:1 to 1:1 according to the volume ratio of the slurry; the strengthening, toughening and shrinkage reduction components include magnesium reinforcement, in-situ toughening whiskers, millimeter-level fibers and shrinkage reducers, wherein the magnesium reinforcement is added according to 4% to 15% of the mass of the cementitious material, the in-situ toughening whiskers are added according to the volume addition of 0.5‰ to 1‰, and the millimeter-level fibers are added according to the volume addition of 0.1% to 1% is added, and the shrinkage reducer is added at 1%-5% of the mass of the cementitious material; the water-resistant dispersible components include hydroxymethyl ethyl cellulose, hydroxypropyl methyl cellulose, sodium-based / calcium-based bentonite, cellulose is added at 0.1-0.5% of the mass of the cementitious material, and bentonite is added at 1%-10% of the mass of the cementitious material; the special admixtures for high-temperature hot water tunnel grouting materials include high-temperature hot water tunnel grouting material setting time regulator, water reducer, and air entraining agent, among which the setting time regulator includes a quick-setting component and a slow-setting component, and the quick-setting component includes lithium carbonate and calcium nitrite. The retarding components include boric acid and sodium D-gluconate. Lithium carbonate is adjusted within the range of 0.01% to 0.05% of the mass of the cementitious material according to actual needs. Calcium nitrite is added at 0.1% to 1% of the mass of the cementitious material. Boric acid is added at 0.1% to 0.3% of the mass of the cementitious material. Sodium D-gluconate is added at 0.1% to 0.5% of the mass of the cementitious material. The water reducer is added at 0.5% to 1.5% of the mass of the cementitious material. The air entraining agent is added at 0.1‰ to 0.3‰ of the mass of the cementitious material. The water-cement ratio is 0.4 to 0.8.

[0007] Furthermore, the sulphoaluminate cement is a rapid-hardening sulphoaluminate cement with a strength grade of R.SAC42.5.

[0008] Furthermore, the microbeads are of grade II or above, with a fineness of ≤12.0%, an active silicon dioxide content of ≥50.00%, and a strength activity index of ≥70%.

[0009] Furthermore, the silica content in the silica ash is ≥90.00%; the specific surface area is 22.00m 2 / g.

[0010] Furthermore, the mineral powder is S95 grade mineral powder with a specific surface area of ​​400m 2 / kg~500m 2 / kg.

[0011] Furthermore, the bulk density of the vitrified microspheres is between 80 and 120 kg / m 3 , The volume water absorption is less than 45%.

[0012] Furthermore, the aerogel powder has a volume density of 180 to 220 kg / m 3 , thermal conductivity at 25℃ is less than or equal to

[0013]

[0014] Furthermore, the magnesium reinforcing agent has a MgO content of ≥25% and a fineness (0.08 mm, sieve residue) of ≤20%.

[0015] Furthermore, the in-situ toughened whisker is a silicon carbide whisker with a density of 3.21 g / cm 3 , modulus 400GPa, length 10-50μm, diameter 100-600nm.

[0016] Furthermore, the millimeter-grade fiber is a millimeter-grade fiber with an elastic modulus of 410 to 710 GPa, a tensile strength of 3 to 6 GPa, a diameter of 0.5 to 2 μm, a length of 20 to 80 μm, and an aspect ratio of 20 to 30.

[0017] Furthermore, the shrinkage reducing agent is an inorganic shrinkage reducing agent, the yield ratio is ≤90%, and the compressive strength ratio is ≥105%.

[0018] Furthermore, the cellulose is hydroxypropyl methylcellulose (HPK), pH = 5.0 ~ 8.5, loss on drying ≤ 5.0; hydroxyethyl methyl cellulose (HEMC), pH = 4.0 ~ 8.0, loss on drying ≤ 5.0.

[0019] Furthermore, the bentonite is sodium-based bentonite, with a blue absorption amount of ≥22g / 100g and a swelling rate of ≥15ml / g.

[0020] Furthermore, the setting time regulator is a quick-setting component and a slow-setting component, wherein the quick-setting component lithium carbonate is industrial-grade lithium carbonate with a purity of ≥95%, the sodium nitrite is industrial-grade sodium nitrite with a purity of ≥95%, the slow-setting component boric acid is analytically pure boric acid with a purity of ≥95%, and the slow-setting component sodium D-gluconate is analytically pure sodium with a purity of ≥95%.

[0021] Furthermore, the water reducing agent is a high performance water reducing agent with a water reduction rate of ≥28%.

[0022] Furthermore, the air content of the air-entraining agent is ≥3%, the water bleeding rate is ≤70%, the water reduction rate is ≥6%, and the change of the air content over 1 hour is -1.5% to +1.5%.

[0023] The specific steps of the preparation method of the heat-insulating shrinkage-reducing water-plugging grouting material suitable for high-temperature hot water tunnels are as follows: first, each material in the multi-component gelling composite material component, each material in the heat-insulating material component, a water reducer and water are configured in proportion and fully mixed, and then the slurry is stirred at a speed of 1000-1500 rpm for 3-5 minutes, and then a special admixture for high-temperature hot water grouting tunnels, a reinforcing, toughening and shrinkage-reducing component and a water-resistant dispersing component are sequentially added to the slurry in proportion and stirred again for 3-5 minutes to obtain the high-temperature hot water tunnel water-plugging grouting material.

[0024] In the present invention, the mineral admixture of the grouting material can play a "chemical filling effect", "physical filling effect" and "ball effect" in the cement-based material. The active SiO2 and other components in the mineral admixture react with the Ca(OH)2 produced by cement hydration to generate CSH gel with gelling properties, reduce the pores between the transition zone between the aggregate and the cement paste and the pores of the cement paste itself, improve the density of the concrete, and thus improve the durability of the concrete; the addition of mineral admixtures can take into account the requirements of strength and fluidity of the grouting material during construction, delay the rate of coagulation and hardening, and at the same time, an appropriate amount of mineral admixtures can weaken the negative effects of high-temperature early curing of the grouting material, ensure a high strength retention rate, and the later strength reduction is very small or even no reduction. The magnesium enhancer is added to the composite water-blocking grouting material, so that it has a controllable delayed micro-expansion deformation characteristic, which can compensate for the chemical, drying and temperature shrinkage of the concrete, and the expansion time matches the shrinkage rate of the cement-based material. At the same time, it can also improve the internal pore structure of the cement matrix to effectively prevent it from cracking, improve durability and meet the needs of crack resistance and anti-seepage. Millimeter-level fibers are easy to disperse, have a small length and are not easy to bend and deform, and will not be blocked by the blocking effect of the fibers to limit the flow of the slurry. Since the toughened whiskers have good high temperature resistance and strength, adding high-strength and high-toughness whiskers / fibers into the cement-based matrix can block macro cracks when passing through the whiskers / fibers, thereby improving the strength and toughness of cement-based materials. Shrinkage reducers can significantly reduce drying shrinkage and improve plastic shrinkage crack resistance. Setting time regulators include quick-setting components and retarding components. The quick-setting components include lithium carbonate and calcium nitrite, and the retarding components include boric acid and sodium D-gluconate. They can effectively regulate the setting time of the multi-gel system water plugging grouting material in a high-temperature hot water environment, so that the grouting material meets the requirements of high-temperature hot water tunnel water plugging grouting construction. The water-resistant dispersing component increases the viscosity of the slurry through the bridging action of the dispersant, adsorbs cement particles and hydrated particles, and forms a network structure, which makes it difficult to disperse in water when injected into a high-temperature hot water tunnel for water plugging, and has a good water-resistant dispersion effect.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) The high-temperature hot water tunnel water plugging grouting material has good working performance and injectability. In the high-temperature hot water tunnel environment, by adjusting the setting time regulator, the setting time of the slurry can be easily controlled. The slurry will not be limited in the pore diffusion range or even block the grouting conduit hole due to a short setting time, nor will the slurry be diluted and dispersed by the flowing water due to a long setting time. The water plugging effect is good.

[0027] 2) The high-temperature hot water tunnel water plugging grouting material overcomes the negative effects of high-temperature early curing to a certain extent by adding auxiliary cementitious materials such as microspheres, silica fume, and mineral powder. At the same time, the addition of millimeter-level fibers, whiskers, and shrinkage reducers can not only ensure that the stone body after grouting has a better strength retention rate, but also improve the volume stability of the stone body, reduce shrinkage, and have a certain toughness, ensuring that it has good durability.

[0028] 3) The high-temperature hot water tunnel water plugging grouting material is added with insulation material components to make the slurry have stable thermal properties, which can effectively prevent high-temperature heat conduction in methods such as high-temperature tunnel full-section curtain grouting, advanced duct grouting, etc. to plug tunnel water gushing and reinforce tunnel surrounding rocks.

[0029] 4) The high-temperature hot water tunnel plugging grouting material is added with water-resistant dispersing components, and the bridging effect of the dispersant is used to increase the viscosity of the slurry, adsorb cement particles and hydrated particles, and form a network structure, so that it is not easy to disperse in water when injected into the high-temperature hot water tunnel for water plugging, and has a good water-resistant dispersion effect. DETAILED DESCRIPTION

[0030] The following examples are used to illustrate the present invention, but they are not intended to limit the scope of the present invention.

[0031] For the determination of the setting time of the high-temperature hot water tunnel plugging grouting material, first, after the material is configured according to the preparation method, it is placed in a container in a high-temperature hot water constant temperature water bath pot used to simulate the high-temperature hot water tunnel environment, and the setting time of the slurry is measured using a setting time measuring instrument. For the strength determination of the high-temperature hot water tunnel plugging grouting material, a high-temperature hot water tunnel environment is simulated by a high-temperature hot water curing box, and different temperature and humidity environments are set. The stirred samples are placed in a high-temperature hot water curing box for curing to the specified age, and the basic mechanical properties are tested. The benchmark mix ratio working conditions and the test results of this patent are compared and analyzed. The test results show that: under the synergistic effect of the multi-component cementitious composite material component, the thermal insulation material component, the strengthening, toughening and shrinkage reduction component, the water-resistant dispersion component and the special admixture for high-temperature hot water grouting tunnel can better deal with the problems of uncontrollable setting time and insufficient strength retention rate of traditional grouting materials in the high-temperature hot water environment during the tunnel plugging grouting construction process. The high-temperature hot water tunnel water plugging grouting material of the present invention is suitable for water leakage in high-temperature hot water tunnels. The setting time of the grouting material can be adjusted between 30s and 5min to meet the construction requirements of the actual project. It has higher mechanical properties and durability than traditional grouting slurry, with compressive and flexural strength increased by 40-60%, shrinkage reduced by 20-30%, thermal insulation performance increased by 15%-30%, and water-resistant dispersion performance increased by 20%-50%. The grouting material of the present invention has good injectability, is easy to be injected into the cracks of the tunnel surrounding rock, has high stability, and has good later strength and durability. It is particularly suitable for use in water plugging construction of high-temperature hot water tunnels.

[0032] The raw materials used in the following implementation are as follows: Rapid hardening sulphoaluminate cement produced by Emeishan Qianghua Special Cement Co., Ltd., with a density of 2912g / m 3 ; Sichuan Chengdu Hengruiyuan Environmental Protection Materials Co., Ltd. shares microspheres, fineness is 1.8μm, specific surface area is 3300m 2 / kg, of which the silicon dioxide content is ≥94.14%; S95 grade mineral powder produced by Jiayuguan Anbang Mining Co., Ltd.; Silica ash: Silica ash produced by Chengdu Hengruiyuan Environmental Protection Materials Co., Ltd., of which the silicon dioxide content is ≥95.00%; Vitrified microspheres: Vitrified microspheres produced by Henan Jieyang New Materials Co., Ltd., with a bulk density of 80-120Kg / m 3 , The volume water absorption rate is less than 45%; Aerogel: Aerogel produced by China Chemical Hualu New Materials Co., Ltd. has a volume density of 180-220kg / m 3 , thermal conductivity at 25℃ is less than or equal to Magnesium reinforcement: Magnesium reinforcement produced by Wuhan Sanyuan Special Building Materials Co., Ltd., MgO content ≥ 25%, fineness (0.08mm, sieve residue) ≤ 20%; In-situ toughening whisker: Silicon carbide whisker produced by Guangzhou Hongwu Materials Technology Co., Ltd., density 3.21g / cm 3 , modulus 400GPa, length 10-50μm, diameter 100-600nm; millimeter-level fiber: fiber produced by Sichuan Dazhou Aerospace Tuoxin Basalt Fiber Industry Co., Ltd., elastic modulus 410-710GPa, tensile strength 3-6GPa, diameter 0.5-2μm, length 20-80μm, aspect ratio 20-30; Shanghai Fengzhu Composite New Material Technology Co., Ltd. millimeter-level fiber, diameter 0.5-2μm, length 20-80μm; cellulose-type water-resistant dispersant: cellulose water-resistant dispersant produced by Shandong Heda Co., Ltd., hydroxypropyl methylcellulose (HPK), pH = 5.0 ~ 8.5, loss on drying ≤ 5.0; hydroxyethyl methyl cellulose (HEMC), pH = 4.0 ~ 8.0, loss on drying ≤ 5.0; Water: tap water, pH value 7.5; Sodium bentonite produced by Yunnan Yanxin Minerals Co., Ltd.; Calcium bentonite produced by Sichuan Wuxing Mining Co., Ltd.; CQJSJ-B inorganic shrinkage reducer produced by Tangshan Polar Bear Building Materials Co., Ltd., shrinkage ratio 90%; Setting time regulator: Tianjin Zhiyuan Chemical Co., Ltd., quick-setting components include lithium carbonate and calcium nitrite, and slow-setting components include boric acid and sodium D-gluconate; Air entraining agent: air entraining agent produced by Shanxi Feike New Materials Technology Co., Ltd., air content ≥ 3%, water bleeding rate ≤ 70%, water reduction rate ≥ 6%, air content 1h time change -1.5% ~ + 1.5%; Water reducer: polycarboxylic acid high-efficiency water reducer produced by Sichuan Giant Star New Materials Co., Ltd., water reduction rate 25% ~ 35%;

[0033] The performance change rate of the embodiment of the present invention is obtained by comparing with a reference group of grouting materials, wherein the reference group of grouting materials is prepared only by sulphoaluminate cement, water and a water reducing agent.

[0034] Example 1: 80°C hot water environment

[0035] Application of main raw materials and main proportion parameters of high temperature hot water tunnel water plugging grouting materials:

[0036] (1) The total amount of multi-component cementitious material components is 1 kg (75% sulphoaluminate cement, 10% microspheres, 10% silica fume, and 5% mineral powder);

[0037] (2) The volume ratio of vitrified microspheres to slurry is 0.5:1;

[0038] (3) cellulose water-resistant dispersant 3%;

[0039] (4) magnesium enhancer 4%;

[0040] (5) The content of millimeter-sized fiber is 1%;

[0041] (6) Shrinkage reducing agent dosage 3%;

[0042] (7) Water reducing agent dosage 1%;

[0043] (8) Retarder dosage: 1.5%;

[0044] The specific formula is as follows (unit: kg)

[0045]

[0046] Technical index tests include: setting time, compressive strength. The test results of this high temperature hot water tunnel water blocking grouting material are shown in the following table:

[0047]

[0048] Example 2: 85°C hot water environment

[0049] Application of main raw materials and main proportion parameters of high temperature hot water tunnel water plugging grouting materials:

[0050] (1) The total amount of multi-component cementitious material components is 1 kg (75% sulphoaluminate cement, 15% microspheres, 5% silica fume, and 5% mineral powder);

[0051] (2) The volume ratio of vitrified microspheres to slurry is 0.6:1;

[0052] (3) cellulose water-resistant dispersant 3%;

[0053] (4) magnesium enhancer 8%;

[0054] (5) Silicon carbide toughening whisker content 0.5‰;

[0055] (6) Shrinkage reducing agent dosage 3%;

[0056] (7) Water reducing agent dosage 1%;

[0057] (8) Retarder dosage: 1.5%;

[0058] The specific formula is as follows (unit: kg)

[0059]

[0060] Technical index tests include: setting time, compressive strength. The test results of this high temperature hot water tunnel water blocking grouting material are shown in the following table:

[0061]

[0062] Example 3: 75°C hot water environment

[0063] Application of main raw materials and main proportion parameters of high temperature hot water tunnel water plugging grouting materials:

[0064] (1) The total amount of multi-component cementitious material components is 1 kg (80% sulphoaluminate cement, 10% microspheres, 5% silica fume, and 5% mineral powder);

[0065] (2) The volume ratio of vitrified microspheres to slurry is 0.4:1;

[0066] (3) cellulose water-resistant dispersant 3%;

[0067] (4) magnesium enhancer 8%;

[0068] (5) The content of millimeter-sized fiber is 1%;

[0069] (6) Shrinkage reducing agent dosage 3%;

[0070] (7) Water reducing agent dosage 1%;

[0071] (8) The dosage of coagulant is 0.3‰;

[0072] The specific formula is as follows (unit: kg)

[0073]

[0074] Technical index tests include: setting time, compressive strength. The test results of this high temperature hot water tunnel water blocking grouting material are shown in the following table:

[0075]

[0076] By adopting the basic scheme of the present invention, the material ratio can achieve the good effect pursued by the invention object within the variation range of the aforementioned invention content.

[0077] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A heat-insulating shrinkage-reducing water-blocking grouting material suitable for high-temperature hot water tunnels, characterized in that: The water plugging grouting material components include multi-component cementitious composite components, thermal insulation components, reinforcing, toughening and shrinkage-reducing components, water-resistant dispersion components and special admixtures for high-temperature hot water tunnel grouting, wherein the multi-component cementitious composite components are fast-hardening sulphoaluminate cement, microspheres, silica fume and mineral powder. The mass proportion of sulphoaluminate cement in the multi-component cementitious composite components is 60% to 85%, the mass proportion of microspheres is 5% to 20%, the mass proportion of silica fume is 5% to 20%, and the mass proportion of mineral powder is 5% to 15%; the thermal insulation material components include vitrified microspheres and aerogels The glass microspheres and aerogel powders in the heat insulation material component can be added singly or in combination, and the amount of the heat insulation material added is in the range of 0.3:1 to 1:1 according to the volume ratio of the slurry; the strengthening, toughening and shrinkage reducing component includes a magnesium reinforcing agent, an in-situ toughening whisker, a millimeter-level fiber and a shrinkage reducing agent, wherein the magnesium reinforcing agent is added according to 4% to 15% of the mass of the cementitious material, the in-situ toughening whisker is added according to 0.5‰ to 1‰ of the volume, the millimeter-level fiber is added according to 0.1% to 1% of the volume, and the shrinkage reducing agent is added according to the mass of the cementitious material. The water-resistant dispersible components include hydroxymethyl ethyl cellulose, hydroxypropyl methyl cellulose, sodium-based / calcium-based bentonite, cellulose is added at 0.1-0.5% of the mass of the cementitious material, and bentonite is added at 1%-10% of the mass of the cementitious material; the special admixtures for high-temperature hot water tunnel grouting materials include high-temperature hot water tunnel grouting material setting time regulator, water reducer, air entraining agent, wherein the setting time regulator includes a quick-setting component and a slow-setting component, the quick-setting component includes lithium carbonate and calcium nitrite, and the slow-setting component includes boron. Acid, sodium D-gluconate and lithium carbonate are adjusted within the range of 0.01% to 0.05% of the mass of the cementitious material according to actual needs, calcium nitrite is added at 0.1-1% of the mass of the cementitious material, boric acid is added at 0.1-0.3% of the mass of the cementitious material, and sodium D-gluconate is added at 0.1-0.5% of the mass of the cementitious material; the amount of water reducer is added at 0.5% to 1.5% of the mass of the cementitious material; the air entraining agent is added at 0.1‰ to 0.3‰ of the mass of the cementitious material; the water-cement ratio is 0.4 to 0.

8.

2. The heat-insulating shrinkage-reducing water-plugging grouting material suitable for high-temperature hot water tunnels according to claim 1, characterized in that: The sulphoaluminate cement is a fast-hardening sulphoaluminate cement with a grade of R.SAC42.5 strength grade; the microspheres are microspheres of grade II or above, with a fineness of ≤12.0%, an active silicon dioxide content of ≥50.00%, and a strength activity index of ≥70%; the silicon dioxide content in the silica ash is ≥90.00%; the specific surface area is 22.00m 2 / g; the mineral powder is S95 grade mineral powder with a specific surface area of ​​400m 2 / kg~500m 2 / kg; the bulk density of the vitrified microspheres is 80-120Kg / m 3 , The volume water absorption is less than 45%.

3. The heat-insulating shrinkage-reducing water-blocking grouting material suitable for high-temperature hot water tunnels according to claim 1, characterized in that: The aerogel powder has a volume density of 180 to 220 kg / m 3 , thermal conductivity at 25℃ is less than or equal to The magnesium reinforcing agent has a MgO content of ≥25% and a fineness (0.08 mm, sieve residue) of ≤20%; the in-situ toughening whisker is a silicon carbide whisker with a density of 3.21 g / cm 3 , modulus 400GPa, length 10-50μm, diameter 100-600nm; the millimeter-grade fiber is a millimeter-grade fiber with an elastic modulus of 410-710GPa, a tensile strength of 3-6GPa, a diameter of 0.5-2μm, a length of 20-80μm, and an aspect ratio of 20-30.

4. The heat-insulating shrinkage-reducing water-plugging grouting material suitable for high-temperature hot water tunnels according to claim 1, characterized in that: The shrinkage reducing agent is an inorganic shrinkage reducing agent, the yield ratio is ≤90%, and the compressive strength ratio is ≥105%. The cellulose is hydroxypropyl methylcellulose (HPK), pH = 5.0 ~ 8.5, loss on drying ≤ 5.0; hydroxyethyl methyl cellulose (HEMC), pH = 4.0 ~ 8.0, loss on drying ≤ 5.

0.

5. The heat-insulating shrinkage-reducing water-plugging grouting material suitable for high-temperature hot water tunnels according to claim 1, characterized in that: The bentonite is sodium-based bentonite, with a blue absorption of ≥22g / 100g and a swelling rate of ≥15ml / g; the setting time regulator is a quick-setting component and a slow-setting component, wherein the quick-setting component lithium carbonate is industrial-grade lithium carbonate with a purity of ≥95%. The sodium nitrite is industrial-grade sodium nitrite with a purity of ≥95%, the slow-setting component boric acid is analytically pure boric acid with a purity of ≥95%, and the slow-setting component sodium D-gluconate is analytically pure with a purity of ≥95%.

6. The heat-insulating shrinkage-reducing water-plugging grouting material suitable for high-temperature hot water tunnels according to claim 1, characterized in that: The water reducing agent is a high-performance water reducing agent with a water reducing rate of ≥28%; the air entraining agent has an air content of ≥3%, a water bleeding rate of ≤70%, a water reducing rate of ≥6%, and an air content change over time of -1.5% to +1.5% in 1h.

7. A method for preparing a heat-insulating shrinkage-reducing water-blocking grouting material suitable for a high-temperature hot water tunnel as claimed in claim 1, characterized in that: The specific steps are as follows: firstly, each material in the multi-component gelling composite material component, each material in the thermal insulation material component, a water reducer and water are fully mixed in proportion, and then the slurry is stirred at a speed of 1000-1500rpm for 3-5 minutes, and then the special admixture for high-temperature hot water grouting tunnel, the reinforcing, toughening and shrinkage reducing component and the water-resistant dispersing component are sequentially added into the slurry in proportion and stirred again for 3-5 minutes to obtain the high-temperature hot water tunnel water plugging grouting material.

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