Low-resilience impervious sprayed concrete admixture and preparation method thereof

Abstract

The invention relates to a low-resilience impervious sprayed concrete admixture and a preparation method thereof. The low-resilience impervious sprayed concrete admixture is prepared from the following components in percentage by mass: 30.0 to 45.0 percent of water-quenched slag powder, 15.0 to 30.0 percent of red mud powder, 10.0 to 20.0 percent of aluminum ash powder, 5.0 to 10.0 percent of aluminate cement clinker powder, 5.0 to 10.0 percent of magnesium oxide expanding agent, 2.0 to 10.0 percent of calcium sulfate whisker, 2.0 to 5.0 percent of nano aluminum oxide sol powder, 1.0 to 5.0 percent of waterproof agent and 0.0 to 1.0 percent of conditioning agent. By means of the composite design of all the materials, the high activity is guaranteed, meanwhile, the reaction with an intermediate-speed setting agent in concrete can be further promoted, the setting time of the sprayed concrete can be remarkably shortened, the early strength of the sprayed concrete can be remarkably improved, and therefore the rebound rate of the sprayed concrete is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering materials, and in particular to a low-rebound and anti-seepage shotcrete admixture and a preparation method thereof. Background Art

[0002] As one of the main forms of support for tunnel and slope protection projects, with the further development of infrastructure construction, the use of shotcrete has increased dramatically along with the projects. At present, due to the unreasonable raw materials and mix ratio parameters of shotcrete, the rebound rate is too large during the spraying process, resulting in a large amount of material waste, which not only affects the construction efficiency, but also puts great pressure on the environment, causing economic pressure and environmental risks for construction units. At the same time, in water-rich karst development areas, the initial support formed by shotcrete can easily become a channel for atmospheric precipitation and surface water to infiltrate, causing problems such as leakage and cracking, and even reducing the service life and safety of tunnel structures.

[0003] In view of the above problems, the root cause lies in shortening the setting time of shotcrete and improving the early strength of shotcrete as much as possible, as well as improving the compactness and waterproof performance of shotcrete as much as possible. With the development of technology, the performance of related shotcrete has gradually improved, but it is all single-sided. For example, a Chinese patent (application number is CN202310991817) discloses a composite admixture for shotcrete, which can significantly reduce the strength rebound rate of shotcrete, but the admixture prepared by the patent is mainly composed of silica fume and some nanomaterials, which has a high economic cost, is not easy to operate, and its technology fails to solve the problem of shotcrete impermeability. A Chinese patent (application number is CN202110827598.1) discloses an impermeable shotcrete, which has good impermeability, but the technology fails to solve the problem of shotcrete rebound rate and volume stability. In view of this, the present invention provides a low-rebound impermeable shotcrete admixture and a preparation method thereof. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a low-rebound anti-seepage shotcrete admixture and a preparation method thereof. The purpose is to make the prepared concrete have the characteristics of good working performance, short setting time, high early strength, low rebound rate and excellent anti-seepage performance by adding the low-rebound anti-seepage shotcrete admixture, and be suitable for the construction of shotcrete.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] In a first aspect, a low-resilience anti-seepage shotcrete admixture is provided, which comprises the following components in percentage by mass: 30.0% to 45.0% of water-quenched slag powder, 15.0% to 30.0% of red mud powder, 10.0% to 20.0% of aluminum ash powder, 5.0% to 10.0% of aluminate cement clinker powder, 5.0% to 10.0% of magnesium oxide expansion agent, 2.0% to 10.0% of calcium sulfate whisker, 2.0% to 5.0% of nano alumina sol powder, 1.0% to 5.0% of waterproofing agent and 0.0 to 1.0% of regulator.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the water-quenched slag powder has a specific surface area of ​​700m 2 / kg~850m 2 / kg of ultrafine powder; the water-quenched slag powder includes the following components by mass percentage: silicon dioxide (SiO2)

[0009] 35.0% to 45.0%, calcium oxide (CaO) 30.0% to 40.0%, aluminum oxide (Al2O3) 7.0% to 15.0%, magnesium oxide (MgO) 2.0% to 8.0%, sulfur trioxide (SO3) 2.0% to 4.0% and titanium dioxide (TiO2) 1.0% to 2.0%;

[0010] The red mud powder is a sintered red mud ultrafine powder, and the specific surface area of ​​the red mud powder is 600m 2 / kg~750m 2 / kg; the red mud powder comprises the following components by mass percentage: silicon dioxide (SiO2) 15.0% to 24.0%, calcium oxide (CaOs) 38.0% to 52.0%, aluminum oxide (Al2O3) 2.0% to 13%, iron oxide (Fe2O3) 4.0% to 15.0%, sodium oxide (Na2O) 1.0% to 9.0% and magnesium oxide (MgO) 0.0 to 7.0%;

[0011] The aluminum ash powder has a specific surface area of ​​600m 2 / kg~800m 2 / kg of ultrafine powder, the aluminum ash powder includes the following components in percentage by mass: 5.0% to 12.0% of metallic aluminum (Al), 45.0% to 70.0% of aluminum oxide (Al2O3), 2.0% to 15.0% of silicon dioxide (SiO2), 1.0% to 15.0% of magnesium oxide (MgO), 1.0% to 7.0% of calcium oxide (CaO) and 0.0% to 7.0% of sodium oxide (Na2O).

[0012] Further, the specific surface area of ​​the aluminate cement clinker powder is 450 2 / kg~600m 2 / kg, the aluminate cement clinker powder includes the following components in percentage by mass: 45.0% to 60.0% of aluminum oxide (Al2O3), 25.0% to 35.0% of calcium oxide (CaO), 3.0% to 10.0% of silicon dioxide (SiO2), 0.0% to 5.0% of iron oxide (Fe2O3) and 0.0% to 5.0% of magnesium oxide (MgO).

[0013] Furthermore, the specific surface area of ​​the magnesium oxide expansion agent is ≥700m 2 / kg, and its active reaction time measured by standard neutralization method is ≤60s.

[0014] Furthermore, the average diameter of the calcium sulfate whisker is 3 μm to 5 μm, the average length is 40 μm to 120 μm, and the CaSO4 content in the calcium sulfate whisker is greater than or equal to 98.0%.

[0015] Furthermore, the nano-alumina sol powder is a nano-scale α-phase aluminum oxide powder, and the average particle size of the nano-alumina sol powder is 20nm to 40nm.

[0016] Furthermore, the waterproofing agent includes at least one of sodium stearate powder, calcium stearate powder, sodium methyl silicate powder, and styrene acrylic polymer powder.

[0017] Furthermore, the regulator comprises the following raw materials in terms of mass percentage: 65.0% of polycarboxylic acid water-reducing powder, 22.0% of sodium gluconate and 13.0% of triterpenoid saponin powder.

[0018] In a second aspect, a method for preparing a low-resilience anti-seepage shotcrete admixture comprises the following steps:

[0019] (1) homogenizing and stirring water-quenched slag powder, red mud powder, aluminum ash powder and aluminate cement clinker powder to obtain a mixture A;

[0020] (2) homogenizing and stirring the magnesium oxide expansion agent, calcium sulfate whisker, nano-alumina sol powder, waterproofing agent and conditioning agent to obtain a mixture B;

[0021] (3) The mixture B and the mixture A are homogenized and stirred to obtain a low-resilience and anti-seepage shotcrete admixture.

[0022] Furthermore, in step (1), the speed of homogenization stirring is 100 r / min to 150 r / min, and the time is 5 min to 10 min; in step (2), the speed is 500 r / min to 800 r / min, and the time is 8 min to 12 min; in step (3), the speed is 100 r / min to 150 r / min, and the time is 5 min to 10 min.

[0023] The beneficial effects of the present invention are:

[0024] (1) The present invention adopts a composite design of cementitious materials including water-quenched slag, red mud, aluminum ash, aluminate cement clinker powder, calcium sulfate whiskers and nano-alumina sol powder. The components of the cementitious materials work synergistically. While ensuring that the cementitious materials themselves have high activity, they can also further promote the reaction with the medium-speed setting agent of concrete, which can significantly shorten the setting time of shotcrete and improve the early strength of shotcrete, thereby reducing the rebound rate of shotcrete.

[0025] (2) The present invention adopts the composite technology of magnesium oxide expansion agent and waterproofing agent, and utilizes the magnesium oxide expansion agent with a reaction activity time of ≤60s to quickly generate Mg(OH)2, which can fill the voids in the shotcrete as early as possible, so that the shotcrete can obtain a higher density; the waterproofing agent can reduce the surface tension and increase the penetration resistance, so as to improve the waterproof performance of the shotcrete; under the joint action of the two, the anti-seepage performance of the shotcrete can be further improved.

[0026] (3) The present invention adds a regulator, wherein the polycarboxylate water-reducing agent and triterpenoid saponin can make the obtained shotcrete obtain better workability and sprayability, and sodium gluconate can realize the regulation of the setting time of the shotcrete, so that the admixture has the characteristics of adjustable setting time, low water demand and good adaptability to other materials.

[0027] (4) The present invention can utilize industrial solid wastes such as water-quenched slag, red mud and aluminum ash on a large scale, greatly reducing the manufacturing cost of shotcrete admixtures. In addition, the preparation process of shotcrete admixtures is simple, the raw materials are cheap and easy to obtain, and have high application value. DETAILED DESCRIPTION

[0028] The principles and features of the present invention are described below. The examples are only used to explain the present invention and are not used to limit the scope of the present invention. If no specific technology or conditions are specified in the embodiments, the technology or conditions described in the literature in the field or the product instructions are used.

[0029] Example 1

[0030] The low-resilience anti-seepage shotcrete admixture provided in this embodiment comprises the following components in terms of mass percentage:

[0031] 39.0% water-quenched slag powder, 18.0% red mud powder, 16.0% aluminum ash powder, 7.5% aluminate cement clinker powder, 4.0% magnesium oxide expansion agent, 5.0% calcium sulfate whisker, 5.2% nano alumina sol powder, 4.8% waterproofing agent, 0.5% regulator, accurately weigh the above components, the waterproofing agent is sodium stearate powder.

[0032] The present embodiment relates to a method for preparing a low-resilience anti-seepage shotcrete admixture, comprising the following steps:

[0033] (1) adding the weighed water-quenched slag powder, red mud powder, aluminum ash powder and aluminate cement clinker powder to a homogenizer A for homogenization and stirring to obtain a mixture A1; the homogenizer speed is 100 to 150 r / min, and the mixture is uniformly stirred for 5 to 10 minutes;

[0034] (2) weighing magnesium oxide expansion agent, calcium sulfate whisker, nano-alumina sol powder, waterproofing agent and conditioning agent and adding them to homogenizer B for homogenization and stirring to obtain mixture B1; the speed of the homogenizer is 500-800 r / min, and the mixture is evenly stirred for 8-12 min;

[0035] (3) The obtained mixture B1 is placed in a homogenizer A and homogenized with the obtained mixture A1. The speed of the homogenizer is 100 to 150 r / min, and the mixture is uniformly stirred for 5 to 10 minutes. A low-resilience anti-seepage shotcrete admixture is thus obtained.

[0036] Example 2

[0037] The low-resilience anti-seepage shotcrete admixture provided in this embodiment comprises the following components in terms of mass percentage:

[0038] 31.0% water-quenched slag powder, 26.0% red mud powder, 16.0% aluminum ash powder, 7.5% aluminate cement clinker powder, 6.0% magnesium oxide expansion agent, 5.0% calcium sulfate whisker, 5.2% nano alumina sol powder, 2.8% waterproofing agent, 0.5% regulator, accurately weigh the above components, the waterproofing agent is calcium stearate powder.

[0039] The present embodiment relates to a method for preparing a low-resilience anti-seepage shotcrete admixture, comprising the following steps:

[0040] (1) adding the weighed water-quenched slag powder, red mud powder, aluminum ash powder and aluminate cement clinker powder to a homogenizer A for homogenization and stirring to obtain a mixture A2; the homogenizer speed is 100 to 150 r / min, and the mixture is uniformly stirred for 5 to 10 minutes;

[0041] (2) weighing magnesium oxide expansion agent, calcium sulfate whisker, nano-alumina sol powder, waterproofing agent and conditioning agent and adding them to homogenizer B for homogenization and stirring to obtain mixture B2; the speed of the homogenizer is 500-800 r / min, and the mixture is evenly stirred for 8-12 min;

[0042] (3) The obtained mixture B2 is placed in a homogenizer A and homogenized with the obtained mixture A2. The speed of the homogenizer is 100 to 150 r / min, and the mixture is uniformly stirred for 5 to 10 minutes. A low-resilience anti-seepage shotcrete admixture is thus obtained.

[0043] Example 3

[0044] The low-resilience anti-seepage shotcrete admixture provided in this embodiment comprises the following components in terms of mass percentage:

[0045] 45.0% water-quenched slag powder, 15.0% red mud powder, 12.0% aluminum ash powder, 6.5% aluminate cement clinker powder, 7.0% magnesium oxide expansion agent, 5.0% calcium sulfate whisker, 5.0% nano alumina sol powder, 3.8% waterproofing agent, 0.7% regulator, accurately weigh the above components, the waterproofing agent is sodium methyl silicate powder.

[0046] The present embodiment relates to a method for preparing a low-resilience anti-seepage shotcrete admixture, comprising the following steps:

[0047] (1) adding the weighed water-quenched slag powder, red mud powder, aluminum ash powder and aluminate cement clinker powder to a homogenizer A for homogenization and stirring to obtain a mixture A3; the homogenizer speed is 100 to 150 r / min, and the mixture is uniformly stirred for 5 to 10 minutes;

[0048] (2) weighing magnesium oxide expansion agent, calcium sulfate whisker, nano-alumina sol powder, waterproofing agent and conditioning agent and adding them to homogenizer B for homogenization and stirring to obtain mixture B3; the speed of the homogenizer is 500-800 r / min, and the mixture is evenly stirred for 8-12 min;

[0049] (3) The obtained mixture B3 is placed in a homogenizer A and homogenized with the obtained mixture A3. The speed of the homogenizer is 100 to 150 r / min, and the mixture is uniformly stirred for 5 to 10 minutes. A low-resilience anti-seepage shotcrete admixture is thus obtained.

[0050] Example 4

[0051] The low-resilience anti-seepage shotcrete admixture provided in this embodiment comprises the following components in terms of mass percentage:

[0052] 39.0% water-quenched slag powder, 19.0% red mud powder, 15.0% aluminum ash powder, 7.5% aluminate cement clinker powder, 7.0% magnesium oxide expansion agent, 5.0% calcium sulfate whisker, 4.2% nano alumina sol powder, 2.8% waterproofing agent, 0.5% regulator, accurately weigh the above components, the waterproofing agent is a mixture of sodium stearate powder and styrene acrylic polymer powder.

[0053] The present embodiment relates to a method for preparing a low-resilience anti-seepage shotcrete admixture, comprising the following steps:

[0054] (1) adding the weighed water-quenched slag powder, red mud powder, aluminum ash powder and aluminate cement clinker powder to a homogenizer A for homogenization and stirring to obtain a mixture A4; the homogenizer speed is 100 to 150 r / min, and the mixture is uniformly stirred for 5 to 10 minutes;

[0055] (2) weighing magnesium oxide expansion agent, calcium sulfate whisker, nano-alumina sol powder, waterproofing agent and conditioning agent and adding them to homogenizer B for homogenization and stirring to obtain mixture B4; the speed of the homogenizer is 500-800 r / min, and the mixture is evenly stirred for 8-12 min;

[0056] (3) The obtained mixture B4 is placed in a homogenizer A and homogenized with the obtained mixture A4. The speed of the homogenizer is 100 to 150 r / min, and the mixture is uniformly stirred for 5 to 10 minutes. A low-resilience anti-seepage shotcrete admixture is thus obtained.

[0057] Comparative Example 1

[0058] The difference from Example 4 is that the water-quenched slag powder, red mud powder and aluminum ash powder used in Comparative Example 1 are all commercially available ordinary powders that have not been ultra-finely ground, and the specific surface area is 400-500m 2 / kg.

[0059] Comparative Example 2

[0060] The difference from Example 4 is that no calcium sulfate whiskers were added in Comparative Example 2.

[0061] Comparative Example 3

[0062] The difference from Example 4 is that no magnesium oxide expansion agent is added in Comparative Example 3.

[0063] Comparative Example 4

[0064] The difference from Example 1 is that no regulator is added in Control Example 4.

[0065] Comparative Example 5

[0066] Control Example 5 is a blank control group without adding low-resilience anti-seepage shotcrete admixture.

[0067] Performance Testing

[0068] The performance of the low-resilience anti-seepage shotcrete admixtures prepared in Examples 1 to 4 and Comparative Examples 1 to 5 was tested, and the test results are shown in Table 1. Comparative Example 5 Shotcrete Mix Ratio (kg / m 3 ) is cement: sand: crushed stone: water: water reducing agent: accelerating agent = 460: 846: 884: 220: 4.6: 27.6. The admixtures prepared in the above embodiments 1 to 4 and control examples 1 to 4 replace cement in shotcrete, and the replacement amount is 40.0% of the cement mass in the concrete.

[0069] (1) Slump of concrete without accelerated setting agent

[0070] The slump test of concrete without accelerated setting agent shall refer to GB / T50080-2016 "Standard for test methods of performance of ordinary concrete mixtures".

[0071] (2) Final setting time

[0072] The final setting time test refers to GB / T 35159-2017 "Accelerators for Shotcrete"

[0073] (3) Rebound rate

[0074] The rebound rate test refers to the Japanese Civil Engineering Society standard JSCE-F 563-2005 "Shotcrete Rebound Rate Test Method", in which the bottom plate of the shotcrete used to test the rebound rate is a 10mm thick steel plate with an area of ​​600mm×600mm, and the side panel of the shotcrete is a 5mm steel plate, which is closed on three sides and open on the bottom. The shotcrete is vertical to the ground, and a 6m×6m plastic sheet is used before spraying to receive the rebound material. The rebound rate of shotcrete is calculated as follows:

[0075]

[0076] Where R r ——Rebound rate, %;

[0077] W r ——mass of rebound material, kg;

[0078] W w ——The mass of concrete bonded to the rebound test mold, kg.

[0079] (4) Compressive strength

[0080] The concrete compressive strength test refers to GB / T 50081-2019 "Standard for Test Methods for Physical and Mechanical Properties of Concrete".

[0081] (5) Impermeability grade

[0082] The concrete impermeability grade test refers to GB / T 50082-2009 "Standard for test methods of long-term performance and durability of ordinary concrete".

[0083] Table 1 Shotcrete performance test results

[0084]

[0085]

[0086] It can be seen from the test results in Table 1 that the sprayability and final setting time of the shotcrete using the admixtures described in Examples 1 to 4 are better than those of the shotcrete in Control Group 5; the rebound rate of the shotcrete in Control Group 5 is 23.6%, while the rebound rate of the shotcrete using the admixtures described in Examples 1 to 4 is 8.5% at most and 5.2% at least, and the rebound rate of the shotcrete is significantly improved; the anti-seepage grade of the shotcrete in Control Group 5 is P6, while the anti-seepage grade of the shotcrete mixed with the admixtures described in Examples 1 to 4 is P10 at least, and the anti-seepage performance of the shotcrete is greatly improved, and the effects are better than those of the shotcrete in Control Examples 1 to 4, indicating that the shotcrete mixed with the admixtures described in Examples 1 to 4 has a lower rebound rate and good anti-seepage performance.

[0087] In summary, the present invention adopts a composite design of cementitious materials including water-quenched slag, red mud, aluminum ash, aluminate cement clinker powder, calcium sulfate whisker and nano-alumina sol powder. The components of each cementitious material work synergistically. While ensuring that the cementitious material itself has high activity, it can further promote the reaction with the medium-speed setting agent in concrete, which can significantly shorten the setting time of shotcrete and improve the early strength of shotcrete, thereby reducing the rebound rate of shotcrete. The present invention adopts the composite technology of magnesium oxide expansion agent and waterproofing agent, and utilizes the magnesium oxide expansion agent with a reaction activity time of ≤60s to quickly generate Mg(OH)2, which can fill the voids in the shotcrete as soon as possible, so that the shotcrete obtains a higher density; the waterproofing agent reduces the surface tension and increases the penetration resistance, which can improve the waterproof performance of the shotcrete; under the joint action of the two, the anti-seepage performance of the shotcrete can be further improved. The present invention adds a regulator, wherein the polycarboxylate water-reducing agent and triterpenoid saponin can make the obtained shotcrete obtain better workability and sprayability, and sodium gluconate can realize the regulation of the setting time of the shotcrete, so that the admixture has the characteristics of adjustable setting time, low water demand and good adaptability to other materials. The present invention can utilize industrial solid wastes such as water-quenched slag, red mud and aluminum ash on a large scale, greatly reducing the manufacturing cost of the shotcrete admixture, and the preparation process of the shotcrete admixture is simple, the raw materials are cheap and easy to obtain, and it has high application value.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0089] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A low-resilience anti-seepage shotcrete admixture, It is characterized in that The low-resilience anti-seepage shotcrete admixture comprises the following components in percentage by mass: 30.0% to 45.0% of water-quenched slag powder, 15.0% to 30.0% of red mud powder, 10.0% to 20.0% of aluminum ash powder, 5.0% to 10.0% of aluminate cement clinker powder, 5.0% to 10.0% of magnesium oxide expansion agent, 2.0% to 10.0% of calcium sulfate whisker, 2.0% to 5.0% of nano alumina sol powder, 1.0% to 5.0% of waterproofing agent and 0.0 to 1.0% of regulator.

2. A low-resilience anti-seepage shotcrete admixture according to claim 1, It is characterized in that The water-quenched slag powder has a specific surface area of ​​700m 2 / kg~850m 2 / kg of ultrafine powder; the water-quenched slag powder comprises the following components by mass percentage: 35.0% to 45.0% silicon dioxide, 30.0% to 40.0% calcium oxide, 7.0% to 15.0% aluminum oxide, 2.0% to 8.0% magnesium oxide, 2.0% to 4.0% sulfur trioxide and 1.0% to 2.0% titanium dioxide; The red mud powder is a sintered red mud ultrafine powder, and the specific surface area of ​​the red mud powder is 600m 2 / kg~750m 2 / kg; the red mud powder comprises the following components by mass percentage: 15.0% to 24.0% silicon dioxide, 38.0% to 52.0% calcium oxide, 2.0% to 13% aluminum oxide, 4.0% to 15.0% iron oxide, 1.0% to 9.0% sodium oxide and 0.0% to 7.0% magnesium oxide; The aluminum ash powder has a specific surface area of ​​600m 2 / kg~800m 2 / kg of ultrafine powder, the aluminum ash powder includes the following components in terms of mass percentage: 5.0% to 12.0% of metallic aluminum, 45.0% to 70.0% of aluminum oxide, 2.0% to 15.0% of silicon dioxide, 1.0% to 15.0% of magnesium oxide, 1.0% to 7.0% of calcium oxide and 0.0% to 7.0% of sodium oxide.

3. A low-resilience anti-seepage shotcrete admixture according to claim 1 or 2, It is characterized in that The specific surface area of ​​the aluminate cement clinker powder is 450m 2 / kg~600m 2 / kg, the aluminate cement clinker powder includes the following components in terms of mass percentage: 45.0%-60.0% of aluminum oxide, 25.0%-35.0% of calcium oxide, 3.0%-10.0% of silicon dioxide, 0.0%-5.0% of iron oxide and 0.0%-5.0% of magnesium oxide.

4. A low-resilience anti-seepage shotcrete admixture according to claim 1 or 2, It is characterized in that The specific surface area of ​​the magnesium oxide expansion agent is ≥700m 2 / kg, the active reaction time of the magnesium oxide expansion agent measured by the standard neutralization method is ≤60s.

5. A low-resilience anti-seepage shotcrete admixture according to claim 1 or 2, It is characterized in that The average diameter of the calcium sulfate whisker is 3 μm to 5 μm, the average length is 40 μm to 120 μm, and the CaSO 4 The content is greater than or equal to 98.0%.

6. A low-resilience anti-seepage shotcrete admixture according to claim 1 or 2, It is characterized in that The nano-alumina sol powder is a nano-scale α-phase aluminum oxide powder, and the average particle size of the nano-alumina sol powder is 20nm-40nm.

7. A low-resilience anti-seepage shotcrete admixture according to claim 1 or 2, It is characterized in that The waterproofing agent includes at least one of sodium stearate powder, calcium stearate powder, sodium methyl silicate powder, and styrene acrylic polymer powder.

8. A low-resilience anti-seepage shotcrete admixture according to claim 1 or 2, It is characterized in that The regulator comprises the following raw materials in terms of mass percentage: 65.0% of polycarboxylic acid water-reducing powder, 22.0% of sodium gluconate and 13.0% of triterpenoid saponin powder.

9. A method for preparing a low-resilience anti-seepage shotcrete admixture according to any one of claims 1 to 8, It is characterized in that The steps include: (1) homogenizing and stirring water-quenched slag powder, red mud powder, aluminum ash powder and aluminate cement clinker powder to obtain a mixture A; (2) homogenizing and stirring the magnesium oxide expansion agent, calcium sulfate whisker, nano-alumina sol powder, waterproofing agent and conditioning agent to obtain a mixture B; (3) The mixture B and the mixture A are homogenized and stirred to obtain a low-resilience and anti-seepage shotcrete admixture.

10. A method for preparing a low-resilience and anti-seepage shotcrete admixture according to claim 9, It is characterized in that The speed of homogenization stirring in step (1) is 100 r / min to 150 r / min, and the time is 5 min to 10 min; the speed of step (2) is 500 r / min to 800 r / min, and the time is 8 min to 12 min; the speed of step (3) is 100 r / min to 150 r / min, and the time is 5 min to 10 min.

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