Portland cement-based tunnel waterproof grouting material as well as preparation method and application thereof

Abstract

The invention relates to a Portland cement-based tunnel waterproof grouting material and a preparation method and application thereof, and belongs to the technical field of underground engineering, and the grouting material comprises the following components in parts by weight: 30 to 50 parts of PO42.5 Portland cement, 1.8 to 3 parts of sodium-based bentonite, 0.03 to 0.15 part of sodium methyl silicate, 0.06 to 0.25 part of hydroxypropyl methyl cellulose ether, 0.15 to 0.35 part of sodium sulfate, 0.009 to 0.04 part of triisopropanolamine, and 0.006 to 0.01 part of lithium carbonate. The paint is prepared from the following components in parts by weight: 0.06 to 0.1 part of polyethylene glycol 400, 0.06 to 0.1 part of styrene-butadiene latex powder, 0.03 to 0.15 part of VAE latex powder, 0.3 to 0.5 part of tributyl phosphate and 30 to 50 parts of water. The prepared grouting material has excellent dispersion resistance and higher mechanical property, flowability and setting percentage, and can realize efficient filling of tunnels.

Description

Technical Field

[0001] The invention belongs to the technical field of underground engineering, and in particular relates to a silicate cement-based tunnel waterproof grouting material and a preparation method and application thereof. Background Art

[0002] During tunnel construction, due to geological conditions and construction factors, after the tunnel concrete lining construction is completed, concrete seepage will occur in areas with large amounts of water. Tunnel concrete seepage will affect the later use and operation of the project. Dealing with tunnel lining seepage is an unavoidable process.

[0003] Grouting materials are cementitious materials that are injected into formation cracks or pores under pressure for filling, reinforcement and water blocking. In order to meet the requirements of construction and use, the following requirements are required for grouting materials: 1) high stone rate and matching strength of the solidified body after solidification; 2) good workability of the slurry, which is easy to pump and grout; 3) controllable setting time; 4) low porosity and good impermeability of the stone body after solidification; 5) for roof grouting, the grouting material is also required to have a certain toughness.

[0004] At present, grouting materials can be generally divided into two categories: inorganic and organic materials. Among them, inorganic particulate materials are mainly based on silicate cement-based materials. At present, new inorganic grouting material systems based on alkali-activated cementitious materials, geopolymer materials, solid waste-based cementitious materials, etc. have also been developed; inorganic solution material systems are mainly based on water glass. The organic polymer grouting material system includes asphalt, epoxy resin, acrylamide, polyurethane, acrylate, urea-formaldehyde resin and other systems. In addition to single inorganic and organic grouting materials, there are also various composite grouting material systems such as inorganic and organic composites, organic and organic composites, and inorganic and inorganic composites.

[0005] Patent CN102702728A discloses a polyurethane grouting water plugging-reinforcement material and a preparation method and a use method. The material disclosed in the document includes two components, component A is an acrylate main agent, polyether polyol and auxiliary materials, and component B is isocyanate and auxiliary materials. The polyurethane material has fast curing and high elasticity, but its long-term stability and durability are poorer than those of silicate cement-based materials. Especially in an environment of long-term immersion in water, the polyurethane may age or degrade.

[0006] Patent CN116970128A discloses a high-permeability and high-strength acrylate grouting material and a preparation method thereof. The material disclosed in the document includes two components, component A is polyether polyol and auxiliary materials, and component B is isocyanate or its premix, which is used for grouting-water plugging reinforcement. The reaction speed is very fast, starting in 20 seconds and basically ending in 90 seconds. The reaction time can be adjusted according to the engineering conditions. The acrylate material has good injectability and flexibility, and is suitable for repairing fine cracks, but its mechanical strength is low, and this type of product is expensive and is not suitable for structures that bear large loads.

[0007] Patent CN104671739B discloses a self-heat-absorbing double-liquid grouting material for coal mine safety and its preparation method. The document utilizes the reaction of water glass and isocyanate, and uses the heat generated by them to initiate the polymerization of double bonds in the reaction system, so that the heat storage temperature of the slurry after solidification is reduced, and the mechanical properties of the grouting material are improved. The water glass material solidifies too fast, and its bonding strength with the substrate is low, and debonding problems may occur during long-term use. The water glass production process also causes serious pollution to the environment.

[0008] Compared with the above materials, silicate cement-based waterproof grouting materials are used in tunnel waterproofing projects, and have the advantages of strong chemical stability, good durability, high strength, etc., and less waste is generated during the construction process, and it is non-toxic and harmless, meeting environmental protection requirements. In addition to meeting the performance requirements, the cost of grouting materials is a key factor to consider in actual engineering applications. The material cost of organic grouting material systems is relatively high. For example, the cost of epoxy resins and acrylamide is more than 10,000 yuan / ton. In the process of grouting treatment of aquifers, the demand for grouting materials is large, which brings a heavy economic burden to coal mining companies. The cement-based or cement-water glass-based grouting materials currently used have low solidification rate and serious water seepage. After the grouting materials are solidified, there is a risk of secondary infiltration of the exuded water. Therefore, the development of a new grouting material system with low cost and low water seepage has significant economic and environmental benefits for tunnel water hazard treatment. Summary of the invention

[0009] In view of the problems that existing grouting materials have poor anti-scouring effect and easily cause groundwater pollution when used for filling under karst dynamic water conditions, and the high cost of grouting materials in karst areas, the present invention proposes a silicate cement-based tunnel waterproof grouting material and a preparation method thereof.

[0010] A silicate cement-based tunnel waterproof grouting material consists of the following components in parts by weight: 30-50 parts of PO42.5 silicate cement, 1.8-3 parts of sodium-based baseless bentonite, 0.03-0.15 parts of sodium methyl silicate, 0.06-0.25 parts of hydroxypropyl methylcellulose ether, 0.15-0.35 parts of sodium sulfate, 0.009-0.04 parts of triisopropanolamine, 0.006-0.01 parts of lithium carbonate, 0.06-0.1 parts of polyethylene glycol 400, 0.06-0.1 parts of styrene-butadiene latex powder, 0.03-0.15 parts of VAE latex powder, 0.3-0.5 parts of tributyl phosphate, and 30-50 parts of water.

[0011] in:

[0012] The specific surface area of ​​the PO42.5 silicate cement is 310m 2 / kg~370m 2 / kg, the coagulation time is 220~260min.

[0013] The specific surface area of ​​the sodium-based free bentonite is 29.5 to 32.5 m 2 / g, bulk density is 0.5~0.6g / cm 3 .

[0014] In the sodium-based free-base bentonite, the mass fraction of montmorillonite is 80% to 90%.

[0015] The viscosity of the hydroxypropyl methylcellulose ether is 40,000 Pa·s.

[0016] The ash content of the styrene-butadiene latex powder is ≤14%, and the bulk density is 0.4-0.6 g / cm 3 , average particle size 80 ~ 90μm, solid content not less than 99%.

[0017] The ash content of the VAE latex powder is ≤12.8%, and the bulk density is 500-600g / cm 3 , particle size ≤400μm, solid content not less than 99.6%.

[0018] The sodium methyl silicate, sodium sulfate, triisopropanolamine, lithium carbonate, polyethylene glycol 400, and tributyl phosphate are all analytically pure.

[0019] The silicate cement-based tunnel waterproof grouting material has an initial setting time of 9 to 10.5 hours, a final setting time of 23 to 24.5 hours, a slurry fluidity of 17 to 25 cm, a water separation rate of ≤1%, a water absorption rate of 7% to 20%, a shrinkage rate of ≤6%, a 7-day flexural strength of ≥1MPa; a 7-day compressive strength of ≥3MPa; a 28-day flexural strength of ≥1.7MPa; and a 28-day compressive strength of ≥7.3MPa.

[0020] The preparation method of the above-mentioned silicate cement-based tunnel waterproof grouting material specifically comprises the following steps:

[0021] PO42.5 silicate cement, sodium-based free-base bentonite, sodium methyl silicate, hydroxypropyl methylcellulose ether, sodium sulfate, triisopropanolamine, lithium carbonate, polyethylene glycol 400, styrene-butadiene latex powder, VAE latex powder, tributyl phosphate and water are weighed according to weight proportions, and after fully mixing, the non-aqueous materials are added into the water and mixed evenly to obtain a silicate cement-based tunnel waterproof grouting material.

[0022] Application of the above-mentioned silicate cement-based tunnel waterproof grouting material in tunnel construction.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The silicate cement-based tunnel waterproof grouting material prepared by the present invention has the characteristics of high fluidity, which enables the slurry to better penetrate into the tiny cracks, pores and other irregular gaps in the tunnel structure during the grouting process. In addition, this high fluidity makes it easier to operate under complex construction conditions and reduces the difficulty of construction.

[0025] 2. The silicate cement-based tunnel waterproof grouting material prepared by the present invention has the characteristics of high mechanical properties, can provide better support and reinforcement effects for the stress concentration area of ​​the tunnel, reduce the generation and expansion of cracks, and effectively prevent water leakage.

[0026] 3. The silicate cement-based tunnel waterproof grouting material prepared by the present invention has the characteristics of low water separation rate, which can improve the stability of the grouting material. Low water separation rate means that less water is separated during the curing process of the grouting material, thereby forming a more effective waterproof barrier.

[0027] 4. The silicate cement-based tunnel waterproof grouting material prepared by the present invention has the characteristics of low shrinkage, which can reduce the stress and cracks generated during the curing process and improve the integrity and durability of the tunnel waterproof layer. In addition, the low shrinkage rate also helps to maintain the compactness of the grouting layer and reduce the need for later maintenance and repair. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] In the embodiments and comparative examples of the present invention, the specific surface area of ​​the PO42.5 silicate cement used is 370 m2 / kg, choosing this silicate cement is more conducive to improving the slurry solidification rate.

[0030] In the embodiments and comparative examples of the present invention, the specific surface area of ​​the sodium-based free-base bentonite used is 31.55 m 2 / g, the viscosity of hydroxypropyl methylcellulose ether is 40,000 Pa·s.

[0031] In the embodiments and comparative examples of the present invention, the sodium methyl silicate, sodium sulfate, triisopropanolamine, lithium carbonate, polyethylene glycol 400 and tributyl phosphate used are all analytically pure, which can avoid introducing impurities into the grouting material and prevent affecting the performance of the grouting material.

[0032] In the embodiments and comparative examples of the present invention, the ash content of the styrene-butadiene latex powder used is 14%, and the bulk density is 0.5 g / cm 3 , average particle size 85μm, solid content 99%.

[0033] In the embodiments and comparative examples of the present invention, the ash content of the VAE latex powder used is 12.8%, and the bulk density is 559 g / cm 3 , particle size ≤ 400 μm, solid content 99.6%. In order to enable those skilled in the art to more clearly understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in conjunction with specific embodiments and comparative examples.

[0034] Example 1

[0035] A silicate cement-based tunnel waterproof grouting material, comprising the following components in parts by weight:

[0036] 50 parts of PO42.5 silicate cement, 3 parts of sodium-based free-base bentonite, 0.05 parts of sodium methyl silicate, 0.15 parts of hydroxypropyl methylcellulose ether, 0.25 parts of sodium sulfate, 0.04 parts of triisopropanolamine, 0.01 parts of lithium carbonate, 0.1 parts of polyethylene glycol 400, 0.1 parts of American Hansen PSB150 styrene-butadiene latex powder, 0.15 parts of German Wacker redispersible latex VAE latex powder 328N, 0.5 parts of tributyl phosphate, and 50 parts of water.

[0037] The setting time of the PO42.5 silicate cement used is 230 min, and the bulk density of the sodium-based free-base bentonite is 0.533 g / cm 3 .

[0038] The above components are uniformly mixed according to mass ratio to prepare silicate cement-based tunnel waterproof grouting material.

[0039] The silicate cement-based tunnel waterproof grouting material prepared in this embodiment was tested by the inverted cup method, and the initial setting time was 9h, the final setting time was 23h, the slurry fluidity was 17.65cm, the water separation rate was less than 1%, the water absorption rate was 12.34%, the shrinkage rate was 4.6%, the 7-day flexural strength was 1.24MPa; the 7-day compressive strength was 4.30MPa; the 28-day flexural strength was 1.93MPa; and the 28-day compressive strength was 7.60MPa. The above performance indicators show that the grouting material has high fluidity and high mechanical properties.

[0040] The silicate cement-based tunnel waterproof grouting material prepared in this embodiment has the characteristics of high fluidity and high mechanical properties, which is beneficial to tunnel water hazard control.

[0041] Example 2

[0042] A silicate cement-based tunnel waterproof grouting material, comprising the following components in parts by weight:

[0043] 50 parts of PO42.5 silicate cement, 3 parts of sodium-based free-base bentonite, 0.1 parts of sodium methyl silicate, 0.1 parts of hydroxypropyl methylcellulose ether, 0.25 parts of sodium sulfate, 0.025 parts of triisopropanolamine, 0.01 parts of lithium carbonate, 0.1 parts of polyethylene glycol 400, 0.1 parts of American Hansen PSB150 styrene-butadiene latex powder, 0.15 parts of German Wacker redispersible latex VAE powder 328N, 0.5 parts of tributyl phosphate, and 50 parts of water.

[0044] The setting time of the PO42.5 silicate cement used is 230 min, and the bulk density of the sodium-based free-base bentonite is 0.533 g / cm 3 .

[0045] The above components are uniformly mixed according to mass ratio to prepare silicate cement-based tunnel waterproof grouting material.

[0046] Example 3

[0047] A silicate cement-based tunnel waterproof grouting material, comprising the following components in parts by weight:

[0048] 50 parts of PO42.5 silicate cement, 3 parts of sodium-based free-base bentonite, 0.1 parts of sodium methyl silicate, 0.15 parts of hydroxypropyl methylcellulose ether, 0.15 parts of sodium sulfate, 0.04 parts of triisopropanolamine, 0.01 parts of lithium carbonate, 0.1 parts of polyethylene glycol 400, 0.1 parts of American Hansen PSB150 styrene-butadiene latex powder, 0.15 parts of German Wacker redispersible latex VAE powder 328N, 0.5 parts of tributyl phosphate, and 50 parts of water.

[0049] The setting time of the PO42.5 silicate cement used is 230 min, and the bulk density of the sodium-based free-base bentonite is 0.533 g / cm 3 .

[0050] The above components are uniformly mixed according to mass ratio to prepare silicate cement-based tunnel waterproof grouting material.

[0051] Example 4

[0052] A silicate cement-based tunnel waterproof grouting material, comprising the following components in parts by weight:

[0053] 50 parts of PO42.5 silicate cement, 3 parts of sodium-based free-base bentonite, 0.15 parts of sodium methyl silicate, 0.15 parts of hydroxypropyl methylcellulose ether, 0.35 parts of sodium sulfate, 0.015 parts of triisopropanolamine, 0.01 parts of lithium carbonate, 0.1 parts of polyethylene glycol 400, 0.1 parts of American Hansen PSB150 styrene-butadiene latex powder, 0.15 parts of German Wacker redispersible latex VAE powder 328N, 0.5 parts of tributyl phosphate, and 50 parts of water.

[0054] The setting time of the PO42.5 silicate cement used is 230 min, and the bulk density of the sodium-based free-base bentonite is 0.533 g / cm 3 .

[0055] The above components are uniformly mixed according to mass ratio to prepare silicate cement-based tunnel waterproof grouting material.

[0056] Example 5

[0057] A silicate cement-based tunnel waterproof grouting material, comprising the following components in parts by weight:

[0058] 50 parts of PO42.5 silicate cement, 3 parts of sodium-based free-base bentonite, 0.15 parts of sodium methyl silicate, 0.15 parts of hydroxypropyl methylcellulose ether, 0.35 parts of sodium sulfate, 0.025 parts of triisopropanolamine, 0.01 parts of lithium carbonate, 0.1 parts of polyethylene glycol 400, 0.1 parts of American Hansen PSB150 styrene-butadiene latex powder, 0.15 parts of German Wacker redispersible latex VAE powder 328N, 0.5 parts of tributyl phosphate, and 50 parts of water.

[0059] The setting time of the PO42.5 silicate cement used is 230 min, and the bulk density of the sodium-based free-base bentonite is 0.533 g / cm 3 .

[0060] The above components are uniformly mixed according to mass ratio to prepare silicate cement-based tunnel waterproof grouting material.

[0061] Example 6

[0062] A silicate cement-based tunnel waterproof grouting material, comprising the following components in parts by weight:

[0063] 50 parts of PO42.5 silicate cement, 3 parts of sodium-based free-base bentonite, 0.15 parts of sodium methyl silicate, 0.15 parts of hydroxypropyl methylcellulose ether, 0.35 parts of sodium sulfate, 0.04 parts of triisopropanolamine, 0.01 parts of lithium carbonate, 0.1 parts of polyethylene glycol 400, 0.1 parts of American Hansen PSB150 styrene-butadiene latex powder, 0.15 parts of German Wacker redispersible latex VAE powder 328N, 0.5 parts of tributyl phosphate, and 50 parts of water.

[0064] The setting time of the PO42.5 silicate cement used is 230 min, and the bulk density of the sodium-based free-base bentonite is 0.533 g / cm 3 .

[0065] The above components are uniformly mixed according to mass ratio to prepare silicate cement-based tunnel waterproof grouting material.

[0066] Example 7

[0067] A silicate cement-based tunnel waterproof grouting material, comprising the following components in parts by weight:

[0068] 50 parts of PO42.5 silicate cement, 3 parts of sodium-based free-base bentonite, 0.1 parts of sodium methyl silicate, 0.15 parts of hydroxypropyl methylcellulose ether, 0.15 parts of sodium sulfate, 0.025 parts of triisopropanolamine, 0.01 parts of lithium carbonate, 0.1 parts of polyethylene glycol 400, 0.1 parts of American Hansen PSB150 styrene-butadiene latex powder, 0.15 parts of German Wacker redispersible latex VAE powder 328N, 0.5 parts of tributyl phosphate, and 50 parts of water.

[0069] The setting time of the PO42.5 silicate cement used is 230 min, and the bulk density of the sodium-based free-base bentonite is 0.533 g / cm 3 .

[0070] The above components are uniformly mixed according to mass ratio to prepare silicate cement-based tunnel waterproof grouting material.

[0071] Example 8

[0072] A silicate cement-based tunnel waterproof grouting material, comprising the following components in parts by weight:

[0073] 50 parts of PO42.5 silicate cement, 3 parts of sodium-based free-base bentonite, 0.1 parts of sodium methyl silicate, 0.15 parts of hydroxypropyl methylcellulose ether, 0.15 parts of sodium sulfate, 0.015 parts of triisopropanolamine, 0.01 parts of lithium carbonate, 0.1 parts of polyethylene glycol 400, 0.1 parts of American Hansen PSB150 styrene-butadiene latex powder, 0.15 parts of German Wacker redispersible latex VAE powder 328N, 0.5 parts of tributyl phosphate, and 50 parts of water.

[0074] The setting time of the PO42.5 silicate cement used is 230 min, and the bulk density of the sodium-based free-base bentonite is 0.533 g / cm 3 .

[0075] The above components are uniformly mixed according to mass ratio to prepare silicate cement-based tunnel waterproof grouting material.

[0076] The test data of the grouting materials prepared in Examples 2-8 are similar to that in Example 1. The waterproof grouting materials prepared in the above examples can be used to treat water seepage in urban tunnel linings.

[0077] Comparative Example 1

[0078] A silicate cement-based tunnel waterproof grouting material, comprising the following components in parts by weight:

[0079] 50 parts of PO42.5 silicate cement, 3 parts of sodium-based free-base bentonite, 0.05 parts of sodium methyl silicate, 0.05 parts of hydroxypropyl methylcellulose ether, 0.35 parts of sodium sulfate, 0.025 parts of triisopropanolamine, 0.01 parts of lithium carbonate, 0.1 parts of polyethylene glycol 400, 0.1 parts of styrene-butadiene latex powder, 0.15 parts of VAE latex powder, and 50 parts of water.

[0080] The setting time of the PO42.5 silicate cement used is 230 min, and the bulk density of the sodium-based free-base bentonite is 0.533 g / cm 3 .

[0081] The above components are uniformly mixed according to mass ratio to prepare silicate cement-based tunnel waterproof grouting material.

[0082] The inverted cup method was used to test the silicate cement-based tunnel waterproof grouting material prepared in this comparative example. The initial setting time was 9.5h, the final setting time was 22.5h, the slurry fluidity was 18.4cm, the water separation rate was 7%, the water absorption rate was 11.5%, the shrinkage rate was 8.8%, the flexural strength after 7 days was 1.36MPa, the compressive strength after 7 days was 3.48MPa, the flexural strength after 28 days was 1.85MPa, and the compressive strength after 28 days was 7.36MPa.

[0083] Compared with Example 1, this comparative example shows that when only 0.05 parts of hydroxypropyl methylcellulose is added to the grouting material, although the mechanical properties and rheological properties remain basically unchanged, the water separation performance of the slurry is significantly reduced, and it is difficult to meet the filling requirements under urban karst dynamic water conditions.

[0084] Comparative Example 2

[0085] A silicate cement-based tunnel waterproof grouting material, comprising the following components in parts by weight:

[0086] 50 parts of silicate cement, 3 parts of sodium-based free-base bentonite, 0.15 parts of sodium methyl silicate, 0.15 parts of hydroxypropyl methylcellulose ether, 0.35 parts of sodium sulfate, 0.015 parts of triisopropanolamine, 0.01 parts of lithium carbonate, 0.1 parts of polyethylene glycol 400, 0.5 parts of tributyl phosphate, and 50 parts of water.

[0087] The setting time of the PO42.5 silicate cement used is 230 min, and the bulk density of the sodium-based free-base bentonite is 0.533 g / cm 3 .

[0088] The above components are uniformly mixed according to mass ratio to prepare silicate cement-based tunnel waterproof grouting material.

[0089] The inverted cup method was used to test the grouting material prepared in this comparative example. The initial setting time was 9.5 h, the final setting time was 22.5 h, the slurry fluidity was 18.4 cm, the water separation rate was 7%, the shrinkage rate was 8.8%, the flexural strength after 7 days was 1.18 MPa, and the flexural strength after 28 days was 1.62 MPa.

[0090] Compared with Example 1, this comparative example shows that without adding styrene-butadiene latex powder and VAE latex powder, there is a problem of poor flexural performance and cannot meet the filling requirements under urban karst dynamic water conditions.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A silicate cement-based tunnel waterproof grouting material, characterized in that: The invention is composed of the following components in parts by weight: 30 to 50 parts of PO42.5 silicate cement, 1.8 to 3 parts of sodium-based baseless bentonite, 0.03 to 0.15 parts of sodium methyl silicate, 0.06 to 0.25 parts of hydroxypropyl methyl cellulose ether, 0.15 to 0.35 parts of sodium sulfate, 0.009 to 0.04 parts of triisopropanolamine, 0.006 to 0.01 parts of lithium carbonate, 0.06 to 0.1 parts of polyethylene glycol 400, 0.06 to 0.1 parts of styrene-butadiene latex powder, 0.03 to 0.15 parts of VAE latex powder, 0.3 to 0.5 parts of tributyl phosphate and 30 to 50 parts of water.

2. A silicate cement-based tunnel waterproof grouting material according to claim 1, characterized in that: The specific surface area of ​​the PO42.5 silicate cement is 310m 2 / kg~370m 2 / kg, the coagulation time is 220~260min.

3. A silicate cement-based tunnel waterproof grouting material according to claim 1, characterized in that: The specific surface area of ​​the sodium-based free bentonite is 29.5 to 32.5 m 2 / g, bulk density is 0.5~0.6g / cm 3 , where the mass fraction of montmorillonite is 80% to 90%.

4. A silicate cement-based tunnel waterproof grouting material according to claim 1, characterized in that: The viscosity of the hydroxypropyl methylcellulose ether is 40,000 Pa·s.

5. A silicate cement-based tunnel waterproof grouting material according to claim 1, characterized in that: The ash content of the styrene-butadiene latex powder is ≤14%, and the bulk density is 0.4-0.6 g / cm 3 , average particle size 80 ~ 90μm, solid content not less than 99%.

6. A silicate cement-based tunnel waterproof grouting material according to claim 1, characterized in that: The ash content of the VAE latex powder is ≤12.8%, and the bulk density is 500-600g / cm 3 , particle size ≤400μm, solid content not less than 99.6%.

7. A silicate cement-based tunnel waterproof grouting material according to claim 1, characterized in that: The sodium methyl silicate, sodium sulfate, triisopropanolamine, lithium carbonate, polyethylene glycol 400, and tributyl phosphate are all analytically pure.

8. The silicate cement-based tunnel waterproof grouting material according to claim 1, characterized in that: The silicate cement-based tunnel waterproof grouting material has an initial setting time of 9 to 10.5 hours, a final setting time of 23 to 24.5 hours, a slurry fluidity of 17 to 25 cm, a water separation rate of ≤1%, a water absorption rate of 7% to 20%, a shrinkage rate of ≤6%, a 7-day flexural strength of ≥1MPa; a 7-day compressive strength of ≥3MPa; a 28-day flexural strength of ≥1.7MPa; and a 28-day compressive strength of ≥7.3MPa.

9. The method for preparing a silicate cement-based tunnel waterproof grouting material according to claim 1, characterized in that: The specific steps include: PO42.5 silicate cement, sodium-based free-base bentonite, sodium methyl silicate, hydroxypropyl methylcellulose ether, sodium sulfate, triisopropanolamine, lithium carbonate, polyethylene glycol 400, styrene-butadiene latex powder, VAE latex powder, tributyl phosphate and water are weighed according to weight proportions, and after fully mixing, the non-aqueous materials are added into the water and mixed evenly to obtain a silicate cement-based tunnel waterproof grouting material.

10. The use of a silicate cement-based tunnel waterproof grouting material according to claim 1, characterized in that: Application of the waterproof grouting material in tunnel construction.