Tunnel grouting water plugging material and preparation method thereof

Abstract

The application discloses a kind of high mechanical performance geopolymer grouting water plugging materials, raw materials include as follows weight parts of raw materials: cement 10-300 parts, ultrafine cement 10-260 parts, fine aggregate 10-260 parts, bentonite 10-130 parts, polyurethane 5-146 parts, acrylate polymer 5-60 parts, waterproof agent 1-10 parts, polypropylene fiber 2-8 parts, antioxidant 1-4 parts, tunnel grouting water plugging material is adjusted by water reducing agent, and its water-binder ratio is 0.4.The grouting water plugging material of the application is synergized by cement, ultrafine cement, fine aggregate, bentonite, polyurethane, acrylate polymer, waterproof agent, polypropylene fiber and antioxidant, which significantly enhances the tensile strength, toughness and durability of the material.The polypropylene fiber forms a three-dimensional network structure inside the material, effectively enhancing the tensile strength and toughness.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of grouting water plugging materials, in particular, relates to a tunnel grouting water plugging material and a preparation method thereof. BACKGROUND

[0002] Grouting water plugging materials are mainly used in underground engineering, tunnels, dams, mines, subways, underground garages and other structures to solve the problems of structural safety and durability caused by water leakage. The material is injected into cracks or pores, and after curing, a dense waterproof layer is formed to prevent water penetration and protect the structure from water damage.

[0003] Conventional grouting water plugging materials usually only rely on the filling and curing of ordinary cement and fine aggregate, although they can provide certain structural strength, but their tensile strength and toughness are insufficient, lack of support, and are prone to cracks and damage under external force; the waterproof performance is limited, and it is difficult for the hydrated calcium silicate generated by cement hydration to seal fine cracks and pores, resulting in poor waterproof effect; the durability is poor, and the material is easily oxidized and aged, degraded under long-term exposure, and the performance rapidly degrades.

[0004] Therefore, the present application is proposed. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a tunnel grouting water plugging material and a preparation method thereof.

[0006] To solve the above technical problems, the technical scheme of the present application is as follows:

[0007] The first aspect of the present application provides a tunnel grouting water plugging material and a preparation method thereof, comprising the following raw materials by weight: cement 10-300 parts, ultra-fine cement 10-260 parts, fine aggregate 10-260 parts, bentonite 10-130 parts, polyurethane 5-146 parts, acrylic ester polymer 5-60 parts, waterproof agent 1-10 parts, polypropylene fiber 2-8 parts, antioxidant 1-4 parts. The tunnel grouting water plugging material is adjusted by water reducing agent, and the water-binder ratio is 0.4. Cement and ultra-fine cement generate hydration products such as C-S-H gel and Ca(OH)2 through hydration reaction. These hydration products fill the pores in the material, increasing the density and strength of the material. Ultra-fine cement has smaller particles and more complete hydration reaction, further improving the initial strength and density of the material.

[0008] Polyurethane and acrylic ester polymer have good adhesion and elasticity, forming a dense polymer film layer in the material. These polymer film layers not only provide excellent waterproof performance, but also increase the flexibility and impact resistance of the material.

[0009] The polypropylene fibers form a three-dimensional network structure in the material, enhancing the tensile strength and toughness of the material. The fibers also hinder the propagation of cracks, disperse stress, and increase the overall stability of the material.

[0010] The antioxidant prevents the material from aging due to oxidation, protecting the stability of the material in the exposed environment.

[0011] Optionally, the length of the polypropylene fiber is 6-12mm, the molecular weight of the polypropylene fiber is 200000-700000, and the diameter is 10-50 microns.

[0012] Optionally, the polyurethane is in a liquid state, and the molecular weight of the polyurethane is 1000-6000.

[0013] Optionally, the acrylate polymer includes but is not limited to a combination of two or more of methyl acrylate, methyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, hydroxyethyl acrylate, and hydroxypropyl acrylate.

[0014] As a preferred, the acrylate polymer is methyl acrylate and butyl acrylate.

[0015] Optionally, the water repellent agent is a mixture of methyl triethoxysilane and polysiloxane, and the mass ratio of the mixture of methyl triethoxysilane and polysiloxane is 1:1.

[0016] Optionally, the polysiloxane is a colorless transparent liquid with a density of 1.0-1.5g / cm 3 and a glass transition temperature below room temperature.

[0017] Optionally, the light stabilizer includes but is not limited to bis[2,2,6,6-tetramethyl-4-piperidyl] sebacate and dioctyl phosphite.

[0018] As a preferred, the methyl triethoxysilane is a colorless transparent liquid with a density of 0.885g / cm 3 and a refractive index of 1.372-1.374.

[0019] Optionally, the antioxidant includes but is not limited to 2,6-di-tert-butyl-4-methylphenol and triphenyl phosphite.

[0020] As a preferred, the antioxidant is 2,6-di-tert-butyl-4-methylphenol and triphenyl phosphite, and the antioxidant is in a liquid state with a molecular weight of 220.35g / mol.

[0021] A tunnel grouting water plugging material and a preparation method thereof, comprising the following steps:

[0022] S1: cement, ultra-fine cement, fine aggregate, bentonite, polypropylene fiber, antioxidant are poured into a mixing device, the mixing device is started, and dry mixing is performed for 15 minutes, and a dry mixture is obtained after uniform mixing;

[0023] S2: polyurethane, acrylate polymer and waterproofing agent are gradually added to the dry mixture. Mixing is continued for minutes, so that the liquid materials are uniformly distributed in the dry mixture, and a composite mixture is obtained.

[0024] S3: water and water reducing agent are mixed in proportion, and then gradually added to the mixture while stirring is continued, and a water plugging material is obtained.

[0025] After the above technical solution is adopted, the present application has the following beneficial effects compared with the prior art. Of course, any product implementing the present application does not necessarily need to achieve all the advantages described below:

[0026] The grouting and water plugging material of the present application significantly enhances the tensile strength, toughness and durability of the material through the synergistic effect of cement, ultra-fine cement, fine aggregate, bentonite, polyurethane, acrylate polymer, waterproofing agent, polypropylene fiber and antioxidant. Among them, the polypropylene fiber forms a three-dimensional network structure inside the material, effectively enhancing the tensile strength and toughness; the polyurethane and acrylate polymer form a dense film layer in the material, significantly hindering the penetration of moisture. In addition, the addition of antioxidant effectively prevents the aging degradation of the material due to oxidation, thereby ensuring the long-term stability and safety of the tunnel structure in various complex environments. DETAILED DESCRIPTION

[0027] The various exemplary embodiments of the present application will now be described in detail, which should not be considered as limiting the present application, but should be understood as a more detailed description of certain aspects, characteristics and embodiments of the present application.

[0028] It should be understood that the terms described in the present application are only for describing the specific embodiments, and are not intended to limit the present application. In addition, for the numerical range in the present application, it should be understood that each intermediate value between the upper limit and the lower limit of the range is also specifically disclosed. Each smaller range between any stated value or intermediate value within the range and any other stated value or intermediate value within the range is also included in the present application. The upper limit and the lower limit of these smaller ranges can be independently included or excluded from the range.

[0029] Unless otherwise indicated, all technical and scientific terms have the same meaning as those one of ordinary skill in the art of the invention would understand. Although preferred methods and grouting water plugging materials are described, any method and grouting water plugging material similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or grouting water plugging materials associated with the document. In the event of any conflict between the content of this specification and any document incorporated by reference, the content of this specification controls.

[0030] Many modifications and variations of the present application described in the specification are possible without departing from the scope or spirit of the application. Other implementations of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application. The specification and examples are illustrative only.

[0031] As used herein, the terms "comprises", "comprising", "includes", "including", "has", "having", and the like are open-ended terms that are intended to permit but not limit the inclusion of elements or the number of elements, as well as the possibility that one or more other elements can be added or otherwise included.

[0032] The tunnel grouting water plugging material disclosed in the embodiments of the present application comprises the following raw materials by weight: cement 10-300 parts, ultra-fine cement 10-260 parts, fine aggregate 10-260 parts, bentonite 10-130 parts, polyurethane 5-146 parts, acrylic ester polymer 5-60 parts, waterproof agent 1-10 parts, polypropylene fiber 2-8 parts, and antioxidant 1-4 parts. The tunnel grouting water plugging material is adjusted by a water reducing agent, and the water-binder ratio thereof is 0.4. The cement and ultra-fine cement generate hydration products, such as C-S-H gel and Ca(OH)2, through hydration reaction. These hydration products fill the pores in the material, increasing the density and strength of the material. The ultra-fine cement further improves the initial strength and compactness of the material due to its smaller particles and more complete hydration reaction.

[0033] The polyurethane and acrylic ester polymer have good adhesion and elasticity, forming dense polymer film layers in the material. These polymer film layers not only provide excellent waterproof performance but also increase the flexibility and impact resistance of the material.

[0034] The polypropylene fiber forms a three-dimensional network structure in the material, enhancing the tensile strength and toughness of the material. The fiber also hinders the expansion of cracks, disperses stress, and increases the overall stability of the material.

[0035] In some embodiments of the present application, the length of the polypropylene fiber is 6-12 mm, the molecular weight of the polypropylene fiber is 200000-700000, and the diameter of the polypropylene fiber is 10-50 microns.

[0036] In some embodiments of the present application, the polyurethane is in a liquid state, and the molecular weight of the polyurethane is 1000-6000.

[0037] A tunnel grouting water plugging material and a preparation method thereof, comprising the following steps:

[0038] S1: the cement, the ultra-fine cement, the fine aggregate, the bentonite, the polypropylene fiber and the antioxidant are poured into a mixing device, the mixing device is started, and dry mixing is performed for 15 minutes; and after uniform mixing, a dry mixture is obtained;

[0039] S2: the polyurethane, the acrylate polymer and the waterproof agent are gradually added into the dry mixture; and mixing is continuously performed for minutes, so that the liquid material is uniformly distributed in the dry mixture; and a composite mixture is obtained;

[0040] S3: the water and the water reducing agent are mixed according to a proportion, and then gradually added into the mixture while stirring is continuously performed, so that the water plugging material is obtained.

[0041] It should be noted that all raw materials in the embodiments of the present application are obtained through a commercial purchase route.

[0042] In the following embodiments, the acrylate polymer is methyl acrylate and butyl acrylate.

[0043] In the following embodiments, the waterproof agent is a mixture of methyl triethoxysilane and polysiloxane, and the mass ratio of the mixture of methyl triethoxysilane and polysiloxane is 1:1.

[0044] In the following embodiments, the methyl triethoxysilane is a colorless transparent liquid, the density is 0.885 g / cm 3 , and the refractive index is 1.372.

[0045] In the following embodiments, the polysiloxane is a colorless transparent liquid, the density is 1.0-1.5 g / cm 3 , and the glass transition temperature is lower than room temperature.

[0046] In the following embodiments, the antioxidant is triphenyl phosphite, and the antioxidant is in a liquid state, and the molecular weight of the antioxidant is 220.35 g / mol.

[0047] Embodiment 1:

[0048] A tunnel grouting water plugging material is composed of the following raw materials in parts by weight: cement 30 parts, ultra-fine cement 30 parts, fine aggregate 10 parts, bentonite 10 parts, polyurethane 40 parts, acrylate polymer 10 parts, waterproof agent 3 parts, polypropylene fiber 8 parts, and antioxidant 1 part; the tunnel grouting water plugging material is adjusted by a water reducing agent, and the water-binder ratio is 0.4.

[0049] Embodiment 2:

[0050] A tunnel grouting water plugging material is provided, which is composed of the following raw materials in parts by weight: cement 25 parts, ultra-fine cement 25 parts, fine aggregate 10 parts, bentonite 10 parts, polyurethane 10 parts, acrylate polymer 10 parts, water repellent 3 parts, polypropylene fiber 5 parts, antioxidant 1 part. The tunnel grouting water plugging material is adjusted by a water reducing agent, and the water-binder ratio thereof is 0.4.

[0051] Example 3:

[0052] A tunnel grouting water plugging material is provided, which is composed of the following raw materials in parts by weight: cement 35 parts, ultra-fine cement 15 parts, fine aggregate 10 parts, bentonite 10 parts, polyurethane 10 parts, acrylate polymer 10 parts, water repellent 3 parts, polypropylene fiber 2 parts, antioxidant 1 part. The tunnel grouting water plugging material is adjusted by a water reducing agent, and the water-binder ratio thereof is 0.4.

[0053] Comparative Example 1: A tunnel grouting water plugging material is provided, which is composed of the following raw materials in parts by weight: cement 25 parts, ultra-fine cement 25 parts, fine aggregate 10 parts, bentonite 10 parts, polyurethane 10 parts, water repellent 3 parts, and the water-binder ratio thereof is 0.40.

[0054] Experimental Example 1: Compressive Strength Test

[0055] The test was carried out in accordance with the test requirements in “Cement Mortar Strength Test” (GB / T 17671-1999), and a standard compressive strength testing machine was used for testing. The equipment was calibrated to ensure that it was in good working condition. According to the requirements of GB / T 17671-1999, the loading speed was set to 2.4±0.2 kN / s. The sample was placed in the center of the lower pressing plate of the testing machine, and the equipment was started to load at a constant speed until the sample was destroyed. The maximum load at the time of destruction was recorded. The compressive strength was calculated based on the destruction load of the sample and the cross-sectional area of the sample. The compressive strength test results of the final Examples 1-3 and Comparative Example 1 are shown in Table 1.

[0056] Table 1: Compressive Strength Test Results

[0057] Sample Example 1 Example 2 Example 3 Control Example 1 Compressive strength (MPa) 51.2 49.8 46.3 39.2

[0058] As can be seen from Table 1, the strength of Examples 1-3 is higher than that of Comparative Example 1, mainly due to the addition of 8 parts, 5 parts and 2 parts of polypropylene fiber in Examples 1, 2 and 3 respectively, while no polypropylene fiber is added in Comparative Example 1. Polypropylene fiber plays an important role in reinforcing the material. Its high strength and high modulus characteristics enable it to effectively disperse stress in the mixture, increasing the tensile strength and toughness of the material. Specifically, the addition of polypropylene fiber can prevent the generation and propagation of cracks, thereby improving the strength and durability of the overall structure.

[0059] In addition, 1 part of antioxidant was added in each of Examples 1-3, which played an important protective role in the performance stability of the material. In the exposed environment, the material is usually eroded by oxidation, leading to its performance degradation and shortened service life. Antioxidants can effectively prevent the occurrence of oxidation reactions.

[0060] Polyurethane and acrylic polymers were added in each of Examples 1-3, which had good adhesion and elasticity, and could significantly improve the overall performance of the material. Polyurethane had excellent elasticity and wear resistance, which could increase the flexibility and impact resistance of the material. Acrylic polymers played a key modification role in the material due to their excellent adhesion and weather resistance. The addition of these polymers not only improved the mechanical properties of the material, but also improved its durability and service life, so that the materials in the examples could maintain high strength and stability in various complex use environments.

[0061] In summary, the material strength in Examples 1-3 was significantly higher than that in Comparative Example 1, mainly due to the reinforcing effect of polypropylene fibers, the protective effect of antioxidants, and the modification effect of polyurethane and acrylic polymers.

[0062] Experimental Example 2: Water absorption test

[0063] According to the test requirements in "Polymer Cement Waterproof Coating" (GB / T 23445-2009), the well-maintained test sample was weighed before the test, and the initial mass was recorded to 0.1 g. The test sample was placed in an oven and dried to constant weight at a temperature of (105±5℃), usually at least 24 hours. Weigh every 2 hours, when the difference between two times is less than 0.1 g, it is considered as constant weight. Record the mass after drying, accurate to 0.1 g. The dried test sample was completely immersed in room temperature water (20±5℃) for 48 hours. Ensure that the test sample is completely immersed in water, and there is no bubble attached to the surface of the test sample, if necessary, pressurize on the water surface to ensure that the test sample is fully water absorbed. Ensure that the test sample is completely immersed in water, and there is no bubble attached to the surface of the test sample, if necessary, pressurize on the water surface to ensure that the test sample is fully water absorbed. Immediately weigh the test sample and record the mass after water absorption. The final compressive strength test results of Examples 1-3 and Comparative Example 1 are shown in Table 2.

[0064] Table 2: Water absorption test results

[0065] Sample Example 1 Example 2 Example 3 Control Example 1 Water absorption (%) 1.18 1.29 1.10 3.04

[0066] As shown in Table 2, the water absorption of Examples 1-3 is lower than that of Comparative Example 1, the addition of polypropylene fibers not only improves the tensile strength and toughness of the material, but also forms a three-dimensional network structure inside the material, effectively preventing the penetration and diffusion of water, and reducing the water absorption.

[0067] In addition, 1 part of an antioxidant was added in each of Examples 1-3. These additives can effectively prevent the aging of the material due to oxidation in the exposed environment, maintain the structural stability and compactness of the material, and reduce the water intrusion path increased due to material degradation. The role of the antioxidant is to capture free radicals to prevent the occurrence of oxidation reactions, thereby protecting the chemical stability of the material and reducing the increase in water absorption due to material aging.

[0068] Finally, polyurethane and acrylic ester polymers were added in each of Examples 1-3, which have good adhesion and elasticity, can form a dense film layer in the material, and prevent the penetration of moisture. The addition of polyurethane provides excellent waterproof performance, and its good elasticity allows the material to deform moderately when subjected to external pressure without cracking. Polyurethane also has excellent wear resistance and weather resistance, which can maintain stable waterproof effect in long-term use. The acrylic ester polymer, through its excellent adhesion performance, tightly binds the components of the material together to form a uniform and dense whole. In addition, the weather resistance and anti-aging performance of the acrylic ester polymer enable the material to maintain low water absorption in complex environments. The combined effect of these polymers significantly improves the durability and waterproof performance of the material, ensuring that the material can effectively prevent the penetration of moisture during use.

[0069] In summary, the water absorption of Examples 1-3 is lower than that of Comparative Example 1, mainly due to the reinforcing effect of polypropylene fibers, the protective effect of antioxidants, and the modification effect of polyurethane and acrylic ester polymers. The tunnel grouting water plugging material not only has high strength, but also has excellent waterproof performance, which can effectively resist water intrusion and maintain the durability and stability of the material. Through these improvements, the comprehensive performance of the material has been significantly improved, meeting the actual needs of tunnel engineering.

[0070] The preparation method of the test samples in Experimental Examples 1 and 2 is to pour the uniformly mixed slurry into a standard mold, paying attention to fill it densely and scrape the surface flat. The test sample together with the mold is placed in a curing box to maintain the temperature (20±1℃) and humidity (≥90%) for initial curing for 24 hours. After 24 hours, the test sample is removed from the mold. Finally, the demolded test sample is placed in a curing pool under the conditions of temperature (20±1℃) and humidity (≥90%) for continued curing for 28 days.

[0071] The present application is not limited to the above-described embodiments, and anyone should know that structural changes made under the inspiration of the present application fall within the scope of the present application. Any technical, shape, or structure not described in detail in the present application is a known technology.

Claims

1. A tunnel grouting and water-blocking material, characterized in that, The raw materials include the following parts by weight: 10-30 parts cement, 30-260 parts ultrafine cement, 10-260 parts fine aggregate, 10-130 parts bentonite, 5-146 parts polyurethane, 5-60 parts acrylate polymers, 1-10 parts waterproofing agent, 2-8 parts polypropylene fiber, and 1-4 parts antioxidant. The tunnel grouting and water-blocking material is adjusted by a water-reducing agent, and its water-cement ratio is 0.

4. The acrylate polymers include, but are not limited to, combinations of two or more of methyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, hydroxyethyl acrylate, and hydroxypropyl acrylate. The waterproofing agent is a mixture of methyltriethoxysilane and polysiloxane, and the mass ratio of the mixture of methyltriethoxysilane and polysiloxane is 1:

1. Methyltriethoxysilane is a colorless, transparent liquid with a density of 0.885 g / cm³. 3 Its refractive index is 1.372-1.374; Polysiloxane is a colorless, transparent liquid with a density of 1.0-1.5 g / cm³. 3 Its glass transition temperature is below room temperature; The antioxidant is triphenyl phosphite, and it is in liquid form with a molecular weight of 220.35 g / mol.

2. The tunnel grouting and water-blocking material according to claim 1, characterized in that, Polyurethane is in liquid form and has a molecular weight of 1000-6000.

3. The tunnel grouting and water-blocking material according to claim 1, characterized in that, The length of polypropylene fibers is 6-12mm, the molecular weight of polypropylene fibers is 200,000-700,000, and the diameter is 10-50μm.

4. A method for preparing the tunnel grouting and water-blocking material according to any one of claims 1-3, characterized in that, Includes the following steps: S1: Pour cement, ultrafine cement, fine aggregate, bentonite, polypropylene fiber, and antioxidant into the mixing equipment, start the mixing equipment, dry mix for 15 minutes, and obtain a dry mixture after uniform mixing; S2: Gradually add polyurethane, acrylate polymer and waterproofing agent to the dry mixture, continue mixing, so that the liquid material is evenly distributed in the dry mixture, and thus obtain the composite mixture; S3: Mix water and water-reducing agent in proportion, then gradually add the mixture to the mixture while continuing to stir to obtain the water-blocking material.