An inorganic multi-compound gelling agent suitable for early high-strength shotcrete

Abstract

The present invention relates to the field of concrete technology, specifically an inorganic multi-composite gelling agent suitable for early high-strength shotcrete, comprising the following components and their weight proportions: 180 to 260 parts of a composite activator system; 150 to 220 parts of a bio-based toughening network material; 5 to 8 parts of an intelligent slow-release water-retaining component; 60 to 80 parts of an interface reinforcing material; 120 to 150 parts of a volcanic ash activity regulator; 15 to 18 parts of a polycarboxylic acid-based water reducer; and 50 to 80 parts of calcium carbonate whiskers. The gelling agent is intended to improve the early strength, compressive strength, and flexural strength of shotcrete while maintaining good workability and volume stability. Through innovative material design and precise component control, the present invention achieves a breakthrough in the comprehensive performance of shotcrete materials, including early strength, high toughness, durability, and ease of construction, and has significant technological advancement and engineering application value.

Description

Technical Field

[0001] The invention relates to the technical field of concrete, in particular to an inorganic multi-compound gelling agent suitable for early high-strength shotcrete. Background Art

[0002] Shotcrete is a concrete structure formed by spraying a concrete mixture onto a substrate using compressed air or other delivery methods. It is widely used in tunnel support, slope protection, underground engineering, mine roadway support, and building reinforcement. Shotcrete offers fast construction speed and flexible operation, enabling rapid formation of support structures in complex environments, effectively preventing deformation and collapse of the surrounding rock or substrate, and ensuring construction safety.

[0003] However, there are many technical bottlenecks in the practical application of traditional shotcrete, which restricts its further development and application. The main problems are as follows:

[0004] After shotcrete construction is completed, it must quickly reach a certain strength to provide support. This is especially true in tunnel and slope construction. Insufficient early strength can lead to increased deformation of the surrounding rock or matrix, and even cause safety accidents. Traditional shotcrete, due to the limited hydration reaction rate of the cementitious material, develops slowly at an early stage, making it difficult to meet the demands of rapid construction and immediate support.

[0005] During construction, shotcrete is susceptible to factors such as base deformation and external impact, making it prone to cracking. Once cracks form, they not only compromise the integrity of the structure but can also lead to leakage, steel corrosion, and other problems, reducing the durability of the project. Traditional shotcrete has poor toughness and crack resistance, making it difficult to effectively withstand these adverse factors.

[0006] During the construction process, shotcrete is prone to rapid water evaporation due to factors such as high spraying speeds and fluctuating ambient temperatures. This rapid loss of water leads to incomplete hydration reactions within the concrete, compromising strength development and durability. Furthermore, poor water retention can lead to shrinkage cracks on the concrete surface, further degrading its performance. Traditional shotcrete has poor water retention, making it difficult to maintain moisture during construction.

[0007] The interfacial bonding between shotcrete and the substrate is a key factor affecting its integrity and durability. Poor interfacial bonding can lead to problems such as debonding and hollowing between the concrete and the substrate, compromising structural stability. Traditional shotcrete suffers from inadequate interfacial bonding, especially on wet substrates or complex surface conditions, where guaranteed interfacial bonding is even more challenging.

[0008] Conventional early strength agents (such as calcium chloride) will introduce corrosive chloride ions, leading to steel corrosion and structural degradation; at the same time, the risk of sulfate attack also affects long-term durability. High-dosage fiber materials can easily lead to a decrease in the fluidity of the mixture, which is prone to pipe blockage during spraying, and the rebound rate is usually as high as over 15%.

[0009] In summary, traditional shotcrete has many shortcomings in terms of early strength, toughness, water retention, interfacial bonding performance and volcanic ash activity, and it is difficult to meet the requirements of modern engineering for high performance, rapid construction and high durability of shotcrete. Summary of the Invention

[0010] In view of the shortcomings of the existing technology, the present invention provides an inorganic multi-combination gelling agent suitable for early high-strength shotcrete, which is intended to improve the early strength, compressive strength and flexural strength of shotcrete while maintaining good workability and volume stability.

[0011] According to a first aspect of the present invention, there is provided an inorganic multi-component gelling agent suitable for early high-strength shotcrete, comprising the following components and their weight proportions:

[0012] 180-260 parts of composite activator system;

[0013] 150-220 parts of bio-based toughened network material;

[0014] 5-8 parts of intelligent slow-release water-retaining component;

[0015] 60-80 parts of interface reinforcement material;

[0016] 120-150 parts of volcanic ash activity regulator;

[0017] 15-18 parts of polycarboxylic acid water reducer;

[0018] 50-80 parts of calcium carbonate whiskers

[0019] The inorganic multi-synthetic gelling agent of the present invention significantly improves the early strength, toughness and water retention of shotcrete by compounding a variety of high-performance materials. The composite activator system can effectively stimulate the activity of the cementitious material and promote the development of early strength; the bio-based toughening network material improves the toughness and crack resistance of the concrete; the intelligent slow-release water-retention component can slowly release water during the construction process to improve the water retention of the concrete; the interface reinforcement material and the volcanic ash activity regulator further optimize the microstructure of the concrete and improve its durability and work performance. The addition of calcium carbonate whiskers further enhances the mechanical properties of the concrete. The gelling agent of the present invention is suitable for various shotcrete projects that require rapid construction and have high requirements for early strength and durability.

[0020] According to an embodiment of the present invention, the composite activator system is composed of a calcium nitrate-lithium aluminate complex and nano magnesium silicate, wherein

[0021] Calcium nitrate-lithium aluminate complex (Ca(NO3)2-LiAlO2) is 150-220 parts;

[0022] 25-40 parts of nano magnesium silicate (MgSiO3).

[0023] According to an embodiment of the present invention, the composite activator system is composed of a calcium nitrate-lithium aluminate complex and nano-magnesium silicate, wherein:

[0024] In the calcium nitrate-lithium aluminate composite (Ca(NO3)2-LiAlO2), lithium aluminate accounts for 5-8wt% of the calcium nitrate-lithium aluminate composite, and the rest is calcium nitrate with a particle size of D50≤10μm;

[0025] Nano magnesium silicate (MgSiO3) has a particle size of 40-60 nm and a specific surface area of ​​≥200 m² / g.

[0026] The composite activator system, consisting of calcium nitrate, lithium aluminate, and nano-magnesium silicate, exhibits an excellent synergistic effect. Calcium nitrate provides the calcium and nitrate ions required for early strength development, promoting early strength development while preventing chloride ion corrosion. The lithium ions in lithium aluminate significantly accelerate the hydration reaction of silicate minerals, while the aluminum ions participate in the formation of a dense hydrated calcium aluminate phase. Nano-magnesium silicate not only acts as a nanoscale active filler, but its abundant surface hydroxyl groups also form strong chemical bonds with hydration products. The synergistic effect of these three factors results in a one-day compressive strength of concrete exceeding 28 MPa.

[0027] According to an embodiment of the present invention, the bio-based toughened network material comprises:

[0028] 50-70 parts of chitin nanocrystal / carbon nanotube hybrid material (CNC / CNT), wherein the mass ratio of chitin nanocrystal to carbon nanotube is 1:0.8-1.2, the chitin nanocrystal has a diameter of 5-20 nm and a length of 100-500 nm;

[0029] 100 to 150 parts of recycled steel fibers treated with zinc phosphate on the surface, with a zinc phosphate coating thickness of 1.5 to 3 μm, a fiber length of 8 to 10 mm, and a diameter of 0.12 to 0.18 mm.

[0030] According to an embodiment of the present invention, in the chitin nanocrystal / carbon nanotube hybrid material, the crystallinity of the chitin nanocrystal (CNC) is ≥85%, and the carbon nanotube (CNT) is a carboxylated multi-walled carbon nanotube with a carboxyl content of ≥3 wt%.

[0031] The bio-based toughening network, comprised of a hybrid system of chitosan nanocrystals (CNCs) and carbon nanotubes (CNTs), forms a multi-scale reinforcement network with recycled steel fibers. The CNCs, through their abundant surface hydroxyl groups, form strong hydrogen bonds with the cement matrix, effectively inhibiting microcrack propagation. The CNTs, with their high aspect ratio and surface carboxyl groups, form strong chemical bonds with cement hydration products. The recycled steel fibers, through the corrosion protection provided by the zinc phosphate coating and fiber bridging, prevent the development of macrocracks. This multi-scale toughening mechanism, from nanometer to micrometer to millimeter, increases the material's fracture energy to 3.5 kJ / m².

[0032] According to an embodiment of the present invention, the intelligent sustained-release water-retaining component is a temperature-sensitive poly (N-isopropylacrylamide) microcapsule (PNIPAM), which has a phase transition temperature of 28-32°C, a microcapsule particle size of 20-50 μm, and a coating water content of ≥60 wt%.

[0033] According to an embodiment of the present invention, the inner core of the temperature-sensitive poly (N-isopropylacrylamide) microcapsule is a mixture of deionized water and glycerol;

[0034] Among them, the ratio of deionized water to glycerol is 93:7 w / w;

[0035] The shell of the temperature-sensitive poly (N-isopropylacrylamide) microcapsule is a copolymer of N-isopropylacrylamide and acrylic acid, and the proportion of the acrylic acid is 12 to 18 wt %.

[0036] Temperature-responsive PNIPAM microcapsules enable intelligent regulation of water supply. In low-temperature construction environments (<30°C), the microcapsules remain stable and absorb free water, ensuring excellent workability of the mix. When temperatures rise (>30°C), the microcapsule shell contracts, releasing water and promoting continuous hydration of the cement. This responsive water-release mechanism, synergistically with the polycarboxylate superplasticizer, reduces the spray rebound rate to below 7%.

[0037] According to an embodiment of the present invention, the interface reinforcement material is graphene oxide (GO) grafted styrene butadiene latex (GO-SBR), wherein:

[0038] Graphene oxide (GO) is covalently grafted onto styrene-butadiene rubber (SBR) via amide bonds, with a grafting rate of ≥85%;

[0039] The mass ratio of graphene oxide (GO) to styrene-butadiene latex (SBR) is 1:8 to 1:12;

[0040] The graphene oxide sheet has a thickness of 1 to 5 nm, a lateral size of 0.5 to 2 μm, and a surface carboxyl density of ≥0.5 mmol / g.

[0041] The innovative design of graphene oxide (GO) grafted onto styrene-butadiene latex (SBR) achieves a combined rigidity and flexibility in interfacial strengthening. The carboxyl groups on the GO sheets form ionic bonds with calcium ions in the cement hydration products, significantly enhancing interfacial bonding strength. The flexible SBR molecular chains effectively buffer stress concentrations and prevent crack propagation. This covalently grafted composite structure reduces the thickness of the interfacial transition zone to 15 nm and increases the flexural strength to 12 MPa.

[0042] According to an embodiment of the present invention, the pozzolanic activity regulator is prepared by compounding metakaolin and silica fume in a mass ratio of 1:1.5 to 1:2.5, wherein:

[0043] The Al2O3 content in metakaolin is ≥38%, and the activity index is ≥95%;

[0044] The SiO2 content in silica fume is ≥96%, and the average particle size is 0.05~0.15μm.

[0045] The optimized blend of metakaolin and silica fume fully leverages the synergistic advantages of the pozzolanic effect. The activated alumina in the metakaolin reacts with the calcium hydroxide produced by cement hydration to form stable hydrated calcium aluminosilicate. The nanosilica in the silica fume, through a secondary hydration reaction, forms a dense CSH gel. This synergistic effect reduces the 28-day porosity by 18%, significantly improving the durability of concrete.

[0046] According to an embodiment of the present invention, the diameter of the calcium carbonate whisker is 0.8-1.2 μm, the length is 50±5 μm, and the surface is modified with KH-550 silane coupling agent, and the amount of the modifier is 0.8-1.2% of the whisker mass.

[0047] Calcium carbonate whiskers modified with silane coupling agents form a three-dimensional network within the cement matrix. The whiskers' high elastic modulus (410-710 GPa) effectively resists shrinkage stress, while their surface silane groups chemically bond with the cement matrix, preventing interfacial defects. When used in conjunction with steel fibers, they create a multi-stage protection system combining whisker crack prevention and fiber toughening.

[0048] According to an embodiment of the present invention, the inorganic multi-component gelling agent suitable for early high-strength shotcrete provided by the present invention is particularly suitable for engineering scenarios requiring rapid load-bearing and high durability, such as: initial support of tunnels, mine tunnel reinforcement, emergency rescue projects and other special geological conditions construction.

[0049] The inorganic multi-synthetic gelling agent of the present invention significantly improves the early strength, toughness and water retention of shotcrete by compounding a variety of high-performance materials. The composite activator system can effectively stimulate the activity of the cementitious material and promote the development of early strength; the bio-based toughening network material improves the toughness and crack resistance of the concrete; the intelligent slow-release water-retention component can slowly release water during the construction process to improve the water retention of the concrete; the interface reinforcement material and the volcanic ash activity regulator further optimize the microstructure of the concrete and improve its durability and work performance. The addition of calcium carbonate whiskers further enhances the mechanical properties of the concrete. The gelling agent of the present invention is suitable for various shotcrete projects that require rapid construction and have high requirements for early strength and durability.

[0050] Through innovative material design and precise component control, the present invention achieves a breakthrough in the comprehensive performance of shotcrete materials, including early strength, high toughness, durability and easy construction, and has significant technological advancement and engineering application value. DETAILED DESCRIPTION

[0051] The embodiment of the present application provides an inorganic multi-synthetic gelling agent suitable for early high-strength shotcrete.

[0052] Example 1

[0053] This embodiment uses the following components and their weight parts:

[0054] 180 parts of calcium nitrate-lithium aluminate complex;

[0055] 35 parts of nano magnesium silicate;

[0056] 60 parts of chitin nanocrystal / carbon nanotube hybrid material;

[0057] 120 parts of recycled steel fiber treated with zinc phosphate;

[0058] 6 parts of thermosensitive poly (N-isopropylacrylamide) microcapsules;

[0059] 70 parts of graphene oxide grafted styrene butadiene rubber latex;

[0060] 130 parts of a pozzolan activity regulator prepared by mixing metakaolin and silica fume in a mass ratio of 1:2;

[0061] 16 parts of polycarboxylic acid water reducer;

[0062] 65 parts of KH-550 modified calcium carbonate whiskers

[0063] Example 2 (Enhancing Bio-based Networks)

[0064] Based on Example 1:

[0065] Increase the chitin nanocrystal / carbon nanotube hybrid material to 70 parts;

[0066] Reduce recycled steel fiber to 100 parts;

[0067] The amount of microcapsules was increased to 7 parts.

[0068] Example 3 (Strengthening interface bonding)

[0069] Based on Example 1:

[0070] Graphene oxide grafted styrene butadiene latex increased to 75 parts;

[0071] Calcium carbonate whiskers increased to 80 parts;

[0072] Reduce the total amount of metakaolin / silica fume to 120 parts.

[0073] Example 4 (Improving early strength)

[0074] Based on Example 1:

[0075] The calcium nitrate-lithium aluminate complex was increased to 200 parts;

[0076] Nano magnesium silicate increased to 40 parts;

[0077] Microcapsules reduced to 5 parts;

[0078] The recycled steel fiber is increased to 150 parts.

[0079] Example 5 (Optimization of sustained release and water retention)

[0080] Based on Example 1:

[0081] Smart sustained-release microcapsules increased to 8 servings;

[0082] Calcium carbonate whiskers reduced to 50 parts;

[0083] The graphene grafted latex was reduced to 60 parts;

[0084] The steel fiber remains unchanged at 120 parts.

[0085] Example 6

[0086] Based on Example 1:

[0087] Calcium nitrate-lithium aluminate complex: 220 parts;

[0088] Nano magnesium silicate: 40 parts;

[0089] Chitosan nanocrystals / carbon nanotubes: 70 parts;

[0090] Recycled steel fiber: 150 parts;

[0091] Microcapsules: 7 parts;

[0092] Graphene grafted latex: 75 parts;

[0093] Volcanic ash regulator: 140 parts;

[0094] Calcium carbonate whiskers: 70 parts;

[0095] Water reducing agent: 17 parts.

[0096] Comparative Example 1 (without bio-based toughening network)

[0097] The formulation of Example 1 was adopted, but the chitin nanocrystal / carbon nanotube hybrid material and the recycled steel fiber were removed and replaced with an equal volume of fly ash (170 parts).

[0098] Comparative Example 2 (without intelligent slow-release water-retention component)

[0099] The formulation of Example 1 was used, but the thermosensitive polyNIPAM microcapsules were not added, and only a common water-retaining agent (1.5 parts of hydroxypropyl methylcellulose) was used instead.

[0100] Comparative Example 3 (Traditional Activator System)

[0101] The formula of Example 1 was used, but the composite activator system was replaced with 220 parts of calcium nitrate alone, and nano magnesium silicate and lithium aluminate were not used.

[0102] Comparative Example 4 (without interface reinforcement material)

[0103] The formulation of Example 1 was adopted, but the graphene oxide grafted styrene butadiene latex was removed and replaced with 90 parts of ordinary styrene butadiene latex.

[0104] Experimental example:

[0105] 1. Compressive strength test (1 day and 28 days)

[0106] Sample preparation: Concrete samples were prepared according to the specific formulations of each example and comparative example and cured to the specified age under standard curing conditions (temperature 20±2°C, relative humidity above 95%).

[0107] Test Method: Compressive strength testing was performed using GB / T 50081-2019, Standard for Test Methods of Mechanical Properties of Ordinary Concrete. At least three parallel samples were prepared for each group of specimens, and the average value was calculated.

[0108] 2. Flexural strength test (28 days)

[0109] Sample preparation: Prepare the sample in the same way as the compressive strength test and cure for 28 days.

[0110] Test method: Flexural strength test is carried out in accordance with GB / T 50081-2019 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete".

[0111] 3. Chloride ion diffusion coefficient test

[0112] Sample preparation: Samples were prepared according to the formulations of the examples and comparative examples and cured for 28 days.

[0113] Test method: Use ASTM C1202 "Standard test method for rapid determination of chloride ion permeability of concrete" or NTBuild 492 "Test method for resistance of concrete to chloride ion penetration" for testing.

[0114] 4. Shrinkage test

[0115] Sample preparation: Samples were prepared according to the formulations of the examples and comparative examples. Standard prism specimens with dimensions of 100 mm × 100 mm × 515 mm were prepared, with probes embedded at both ends. The specimens were placed under standard curing conditions and cured to the specified age.

[0116] Test method: Shrinkage test is conducted in accordance with GB / T 50082-2009 "Standard for test methods for long-term performance and durability of ordinary concrete".

[0117] 5. Work performance test

[0118] Slump test: The initial slump test was conducted using GB / T 50080-2016 “Standard for test methods for properties of ordinary concrete mixtures”.

[0119] Spray rebound rate test: During the actual spraying operation, the mass of the rebounded material was recorded and the rebound rate was calculated (mass of rebounded material / total mass of sprayed material). The above results are shown in Table 1.

[0120]

[0121] Rapid early strength development

[0122] In the one-day compressive strength test, all examples demonstrated significant early strength advantages, with strength values ​​exceeding 28 MPa. Example 6 achieved the highest one-day compressive strength, reaching 33.0 MPa. In contrast, the one-day compressive strengths of the comparative examples were generally lower, with the lowest value reaching 24.0 MPa (Comparative Example 3). This demonstrates that the gelling agent of the present invention can significantly improve the early strength of shotcrete, meeting the requirements of rapid construction.

[0123] Excellent long-term performance

[0124] In the 28-day flexural strength test, all examples achieved flexural strengths exceeding 12 MPa, with Example 6 performing the most impressively, reaching 14.0 MPa. The flexural strengths of the comparative examples were generally below 12 MPa, with the lowest being 10.5 MPa (Comparative Example 3). This demonstrates that the gelling agent of the present invention not only exhibits high early strength but also exhibits superior long-term mechanical properties, effectively improving the toughness and crack resistance of shotcrete.

[0125] Significantly improved durability

[0126] The chloride ion diffusion coefficient test results show that the chloride ion diffusion coefficients of all embodiments are less than 1.5×10 - 12 m 2 / s, the lowest value is 0.9×10 -12 m 2 / s (Example 6). In contrast, the chloride ion diffusion coefficients of the comparative examples are generally higher, with the highest reaching 2.0×10 -12 m 2 / s (Comparative Example 3). This shows that the gelling agent of the present invention can significantly reduce the chloride ion permeability of concrete, improve its resistance to chloride ion corrosion, and thus enhance durability.

[0127] Good volume stability

[0128] In a 28-day shrinkage test, the shrinkage of all examples did not exceed 0.015%, with the lowest being 0.010% (Example 6). The shrinkage of the comparative examples was relatively high, reaching a maximum of 0.020% (Comparative Example 3). This demonstrates that the gelling agent of the present invention can effectively control shrinkage deformation of concrete, improve its volume stability, and reduce the risk of cracks caused by shrinkage.

[0129] Excellent construction performance

[0130] In terms of workability, all examples exhibited initial slumps exceeding 180 mm, and spray rebound rates were all below 7%, with the lowest being 6.0% (Example 6). In contrast, the comparative examples exhibited poor initial slumps and rebound rates, with the lowest slump being 170 mm (Comparative Example 3) and the highest rebound rate being 9.0% (Comparative Example 3). This demonstrates that the gelling agent of the present invention can significantly improve the workability of shotcrete, increase construction efficiency, and reduce construction costs.

[0131] In summary, the inorganic multi-component gelling agent of the present invention shows significant advantages in early strength, long-term performance, durability, volume stability and construction performance, and can effectively improve the overall performance of shotcrete and meet the demand of modern engineering for high-performance shotcrete.

[0132] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0133] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. An inorganic multi-synthetic gelling agent suitable for early high-strength shotcrete, characterized in that: It includes the following components and their weight parts: 180-260 parts of composite activator system; 150-220 parts of bio-based toughened network material; 5-8 parts of intelligent slow-release water-retaining component; 60-80 parts of interface reinforcement material; 120-150 parts of volcanic ash activity regulator; 15-18 parts of polycarboxylic acid water reducer; 50-80 parts of calcium carbonate whiskers; The composite activator system is composed of a calcium nitrate-lithium aluminate complex and nano-magnesium silicate; The bio-based toughening network material comprises: 50-70 parts of chitin nanocrystal / carbon nanotube hybrid material and 100-150 parts of recycled steel fiber treated with zinc phosphate on the surface; The intelligent sustained-release water-retention component is a temperature-sensitive poly (N-isopropylacrylamide) microcapsule; The interface reinforcement material is graphene oxide grafted styrene butadiene latex; The volcanic ash activity regulator is prepared by compounding metakaolin and silica fume in a mass ratio of 1:1.5 to 1:2.

5.

2. The inorganic multi-gelling agent according to claim 1, characterized in that The calcium nitrate-lithium aluminate complex in the composite activator system is 150 to 220 parts; 25-40 parts of nano magnesium silicate.

3. The inorganic multi-synthetic gelling agent according to claim 2, characterized in that: The composite activator system is composed of a calcium nitrate-lithium aluminate complex and nano magnesium silicate, wherein: The lithium aluminate in the calcium nitrate-lithium aluminate composite accounts for 5-8wt% of the calcium nitrate-lithium aluminate composite, and the rest is calcium nitrate, with a particle size D50≤10μm; The particle size of nano magnesium silicate is 40-60nm, and the specific surface area is ≥200m² / g.

4. The inorganic multi-synthetic gelling agent according to claim 1, characterized in that The mass ratio of chitin nanocrystals to carbon nanotubes in the bio-based toughening network material is 1:0.8-1.2, the diameter of the chitin nanocrystals is 5-20 nm, and the length is 100-500 nm; The zinc phosphate coating has a thickness of 1.5 to 3 μm, a fiber length of 8 to 10 mm, and a diameter of 0.12 to 0.18 mm.

5. The inorganic multi-synthetic gelling agent according to claim 4, characterized in that: In the chitin nanocrystal / carbon nanotube hybrid material, the crystallinity of the chitin nanocrystal is ≥85%, and the carbon nanotube is a carboxylated multi-walled carbon nanotube with a carboxyl content of ≥3 wt%.

6. The inorganic multi-synthetic gelling agent according to claim 1, characterized in that: The microcapsules of the intelligent sustained-release water-retaining component have a particle size of 20 to 50 μm and a coating water content of ≥60 wt%.

7. The inorganic multi-synthetic gelling agent according to claim 6, characterized in that: The inner core of the temperature-sensitive poly (N-isopropylacrylamide) microcapsule is a mixture of deionized water and glycerol. Among them, the ratio of deionized water to glycerol is 93:7 w / w; The shell of the temperature-sensitive poly (N-isopropylacrylamide) microcapsule is a copolymer of N-isopropylacrylamide and acrylic acid, and the proportion of the acrylic acid is 12 to 18 wt %.

8. The inorganic multi-synthetic gelling agent according to claim 1, characterized in that: In the interface enhancement material: Graphene oxide is covalently grafted onto styrene-butadiene latex via an amide bond, with a grafting rate of ≥85%; The mass ratio of graphene oxide to styrene-butadiene latex is 1:8 to 1:12; The graphene oxide sheet has a thickness of 1 to 5 nm, a lateral size of 0.5 to 2 μm, and a surface carboxyl density of ≥0.5 mmol / g.

9. The inorganic multi-synthetic gelling agent according to claim 1, characterized in that: In the volcanic ash activity regulating agent: The Al2O3 content in metakaolin is ≥38%, and the activity index is ≥95%; The SiO2 content in silica fume is ≥96%, and the average particle size is 0.05~0.15μm.

10. The inorganic multi-synthetic gelling agent according to claim 1, characterized in that: The calcium carbonate whiskers have a diameter of 0.8 to 1.2 μm and a length of 50±5 μm, and their surfaces are modified with a KH-550 silane coupling agent, with the amount of the modifier being 0.8 to 1.2% of the whisker mass.

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