Diffusion boundary controllable grouting material for underwater accumulation reinforcement and preparation method thereof

Abstract

The application belongs to the field of underground engineering grouting material research and application, and provides a diffusion boundary controllable grouting material for underwater accumulation reinforcement and a preparation method thereof, which is composed of the following raw materials by weight: material matrix component 800-1000 parts, comprehensive additive 0-25 parts, instant sodium silicate 0-200 parts, and water 600-800 parts. The comprehensive additive comprises an anti-dispersion agent and a water reducing agent; the anti-dispersion agent is mainly composed of the following raw materials by weight: high polymer 7-8 parts, modified cellulose ether 9-10 parts, natural polysaccharide 1-3 parts, and synthetic copolymer 1-2 parts. The material has the advantages of good underwater anti-dispersion capacity, controllable setting time and easy accumulation, and is conducive to realizing the filling of the underwater goaf.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of research and application of grouting materials for underground engineering, and mainly relates to a diffusion boundary controllable grouting material for underwater accumulation reinforcement and a preparation method thereof. BACKGROUND

[0002] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be taken as an acknowledgement or any form of suggestion that this information forms prior art that is publicly known.

[0003] At present, more and more attention is paid to the goaf grouting and filling treatment technology, and it is required to effectively avoid the adverse effects and hazards caused by the goaf. Based on the necessity of goaf treatment, combined with the current development of goaf treatment, there are mainly collapse method, filling method and sealing method, among which the filling method is the most common and can fundamentally solve the problem of goaf, and also has a strong supporting effect on the subsequent application of goaf. After the filling treatment of the goaf, the overall bearing capacity can be effectively improved, and the subsequent settlement and collapse risks can be effectively avoided. In the application of the goaf filling method, the application of the grouting and filling treatment technology is a more representative way. However, for the filling of underwater goaf, the traditional anti-dispersion material has disadvantages, such as slow setting speed, difficulty in retaining in the underwater area with uncertain boundary and difficulty in accumulation. SUMMARY

[0004] In order to solve the above problems, the present application provides a diffusion boundary controllable grouting material for underwater accumulation reinforcement and a preparation method thereof. The material has the advantages of good underwater anti-dispersion ability, controllable setting time and easy accumulation, which is beneficial to realize the filling of underwater goaf.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] In a first aspect of the present application, a comprehensive additive is provided, which comprises an anti-dispersion agent and a water reducing agent.

[0007] The anti-dispersion agent is mainly composed of the following raw materials in parts by weight: 7-8 parts of high polymer, 9-10 parts of modified cellulose ether, 1-3 parts of natural polysaccharide, and 1-2 parts of synthetic copolymer.

[0008] The high polymer and the modified cellulose ether jointly construct a physical cross-linking network, which can improve water retention and stability; the synthetic copolymer can reduce water while combining with the high polymer network, so as to achieve the balance of viscosity and fluidity, and enhance the anti-scouring property, thereby optimizing the dispersion efficiency of the high polymer; the natural polysaccharide can enhance the water retention effect of the modified cellulose ether, and supplement the thickening effect of the high polymer and the cellulose ether, and the network structure can be enhanced through hydrogen bonds.

[0009] The above ingredients are combined in proportion, and through synergistic effect, the formula can effectively maintain the integrity and anti-dispersion performance of the cement slurry in a complex environment. The comprehensive admixture can significantly improve the anti-dispersion capacity of the cement-based material under water, and adjust the fluidity of the material.

[0010] In some embodiments, the high polymer is composed of polyacrylamide and polyvinyl alcohol, and the ratio of the two substances is 5:2-5:3. The polyacrylamide is a high-molecular polymer, and a large number of polar groups are present on the molecular chain. In the underwater environment, these groups can adsorb suspended particles and cement particles in water through electrostatic attraction, and form larger flocculation, thereby reducing the dispersion and loss of particles in water. In addition, the long-chain structure of the polyacrylamide can form a network structure in water, increase the viscosity of the aqueous solution, and the thickening effect can improve the stability of the concrete or slurry, and prevent the dispersion of the concrete or slurry in the underwater environment. The polyvinyl alcohol is a water-soluble high-molecular polymer, which can significantly increase the viscosity of the cement slurry. The thickening effect makes the cement slurry more difficult to be washed and flowed in the flowing water environment. Preferably, the molecular weight of the polyacrylamide used is 8-20 million, and the polyvinyl alcohol used is high-molecular polyvinyl alcohol with a molecular weight of 1.7-2.2 million.

[0011] In some embodiments, the modified cellulose ether is carboxymethyl cellulose. The carboxymethyl cellulose has a complex molecular chain, and special functional groups or groups are introduced, which can be wound and adsorbed on the surface of the cement particles in the cement slurry, form a protective film, reduce the contact between the cement particles and water, and reduce the dispersion of the particles. Preferably, the viscosity specification of the modified cellulose ether is 1000-3000 cps.

[0012] In some embodiments, the natural polysaccharide is composed of xanthan gum, alginate, guar gum and cellulose, and the ratio of the four substances is 4:2:2:1. The molecular chain of the xanthan gum can interact to form a network structure, wrap the cement particles, limit the free movement of the cement particles, and reduce the dispersion and loss of the cement particles in the water flow. The alginate is a natural polysaccharide polymer, which can form a stable three-dimensional network structure in water. This structure can effectively prevent the dispersion and loss of the particles, thereby improving the stability of the material under water. Preferably, the molecular weight of the xanthan gum is 2-5 million.

[0013] In some embodiments, the synthetic copolymer is an acrylate copolymer. The acrylate copolymer can form a uniform film in the cement slurry, wrap the cement particles, prevent the particles from excessive contact with water, reduce the hydration reaction speed, prevent the particles from colliding and dispersing, and has surface activity, which can reduce the surface tension of water, thereby reducing the dispersion of the material in water. This property makes it exhibit good anti-dispersion performance in underwater concrete, slurry and other materials.

[0014] In some embodiments, the water reducing agent is a polycarboxylic acid high-performance water reducing agent. The water reducing agent is 3-5 parts by weight, and the surface activity of the polycarboxylic acid water reducing agent can increase the dispersibility and fluidity of the cement slurry by dispersion, lubrication and wetting.

[0015] In a second aspect of the present application, a preparation method of the comprehensive admixture is provided, comprising:

[0016] The high polymer, the modified cellulose ether, the natural polysaccharide polymer, the synthetic copolymer and the water reducing agent are uniformly mixed to obtain the comprehensive admixture.

[0017] In a third aspect of the present application, a diffusion boundary controllable grouting material for underwater accumulation reinforcement is provided, which is composed of the following raw materials by weight: material matrix component 800-1000 parts, the comprehensive admixture 0-25 parts, instant sodium silicate 0-200 parts, and water 600-800 parts.

[0018] The material matrix component is composed of the following raw materials by weight: ordinary Portland cement 270-500 parts, fly ash 360-600 parts, and active admixture 72-100 parts.

[0019] In some embodiments, the active admixture is composed of microsphere powder, stone powder, silica fume and anhydrite powder. The microsphere powder is in the form of spherical particles, has a "ball bearing" effect, can significantly reduce the viscosity of concrete, increase the fluidity of the paste, and also has high activity, can react with cement hydration products to generate dense hydration products, thereby improving the compressive strength of concrete. The fine particles of microsphere powder can fill the voids between cement particles, improve the pore structure, reduce the porosity of hardened cement stone, thereby improving the durability of concrete. Anhydrite can react with cement hydration products in concrete or mortar to generate hydration products such as ettringite, which fills the pores of the cement stone, thereby improving the early strength. Appropriate addition of anhydrite can improve the flowability of concrete or mortar. Its fine powder form can reduce the friction between aggregates to some extent, making the concrete or mortar mixture more uniform and better flowing. Anhydrite itself has a certain resistance to sulfate attack, and when added to concrete or mortar, it can improve the sulfate resistance of the material and enhance its durability in harsh environments. The fine particles of stone powder can fill the small pores in concrete or mortar, increase the density of the material, and thus improve the compressive and flexural strength. The siliceous components in stone powder have a positive effect on the carbonation resistance of concrete, which can improve the durability of concrete. Silica fume can significantly improve the compressive and flexural strength of concrete. Its ultra-fine particles can fill the small pores in the cement stone, increase the density of the material, and thus improve the strength. Silica fume can significantly improve the durability of concrete in harsh environments such as chloride contamination and sulfate attack, and the service life can be doubled or even several times. The specific surface area of microsphere powder is ≧1000 m 2 / kg, the 28d activity index is ≧90%, the SiO2 content in silica fume is ≧85%, the 28d activity index is ≧85%, the specific surface area of stone powder is ≧800 m 2 / kg, and the SO3 content of anhydrite powder is ≧48%.

[0020] In some embodiments, the diffusion boundary controllable grouting material for underwater accumulation reinforcement includes, by weight, 900 parts of material matrix component, 0 parts of comprehensive admixture, 50 parts of instant sodium silicate, and 700 parts of water.

[0021] In some embodiments, the diffusion boundary controllable grouting material for underwater accumulation reinforcement includes, by weight, 800 parts of material matrix component, 5 parts of comprehensive admixture, 50 parts of instant sodium silicate, and 800 parts of water.

[0022] In some embodiments, the diffusion boundary controllable grouting material for underwater accumulation reinforcement includes, by weight, 900 parts of material matrix component, 15 parts of comprehensive admixture, 0 parts of instant sodium silicate, and 700 parts of water.

[0023] In some embodiments, the diffusion boundary controllable grouting material for underwater stacking reinforcement comprises, by weight, the following components: 900 parts matrix component, 15 parts comprehensive additive, 100 parts fast-dissolving sodium silicate, and 700 parts water.

[0024] In some embodiments, the diffusion boundary controllable grouting material for underwater stacking reinforcement comprises, by weight, the following components: 1000 parts matrix component, 25 parts comprehensive additive, 100 parts fast-dissolving sodium silicate, and 800 parts water.

[0025] In some embodiments, the diffusion boundary controllable grouting material for underwater stacking reinforcement comprises, by weight, the following components: 1000 parts matrix component, 20 parts comprehensive additive, 200 parts fast-dissolving sodium silicate, and 600 parts water.

[0026] A fourth aspect of the present invention provides a method for preparing a diffusion boundary controllable grouting material for underwater deposition reinforcement, comprising:

[0027] Silicate cement, fly ash and active admixtures are mixed evenly to prepare a diffusion boundary controllable grouting material matrix for filling underwater goaf areas;

[0028] First, the material matrix and the comprehensive additives are mixed evenly. Then, the resulting material is mixed evenly in water. Finally, it is mixed evenly with fast-dissolving sodium silicate to obtain a diffusion boundary controllable grouting material for underwater stacking reinforcement.

[0029] More specifically, including:

[0030] Place the 160mm×40mm×40mm mold into the water tank and add water to the tank until it reaches 10cm above the top surface of the mold.

[0031] Weigh the raw materials by weight.

[0032] Mix the material matrix components with the comprehensive additives evenly;

[0033] Pour the mixture obtained in the previous step into water, and then mix it with a concrete mixer for 180 seconds;

[0034] Add the fast-dissolving sodium silicate to the mixture obtained in the previous step and stir until well mixed;

[0035] The mixture obtained in the previous step is poured from the water surface into the mold until the pouring volume exceeds the surface of the mold;

[0036] Place in water and maintain at room temperature.

[0037] A fifth aspect of the present invention provides the application of the above-mentioned grouting material in the construction of goaf areas.

[0038] Beneficial effects of the present invention

[0039] (1) The grouting materials of the present invention are all cement-based materials. Compared with organic polymer grouting materials, they are easy to construct, have low material costs, are stable in bonding with inorganic concrete interfaces, have good aging resistance, and are safe, non-toxic and non-polluting.

[0040] (2) The present invention controls the solidification time of the slurry by controlling the mixing time of the slurry formed by mixing the quick-setting sodium silicate with other materials and the amount of quick-dissolving sodium silicate.

[0041] (3) In view of the problems that ordinary cement-based materials with anti-dispersion ability are difficult to accumulate in the unbounded area and ordinary quick-setting grout has weak anti-dispersion performance in water, this invention proposes an optimized comprehensive admixture and a diffusion boundary controllable grouting material for underwater accumulation reinforcement and its preparation method, which enhances the anti-dispersion ability and accumulation ability of filling materials in the unbounded underwater area of ​​the goaf, and improves the filling effect of the unbounded underwater goaf. Detailed Implementation

[0042] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0043] The present invention will be further described in detail below with reference to specific embodiments. It should be noted that the specific embodiments are explanations of the present invention and not limitations thereof.

[0044] In the following embodiments, the combined admixtures include: 20.5 parts of anti-dispersant and 4 parts of water-reducing agent;

[0045] The anti-dispersant is composed of the following raw materials in parts by weight: 7.5 parts polymer, 9.5 parts modified cellulose ether, 2 parts natural polysaccharide, and 1.5 parts synthetic copolymer.

[0046] The water-reducing agent is a high-performance polycarboxylate water-reducing agent, a commercially available product.

[0047] The polymer is composed of polyacrylamide and polyvinyl alcohol in a ratio of 5:2. The molecular weight of the polyacrylamide is 8 million to 20 million, and the polyvinyl alcohol is a high degree of polymerization polyvinyl alcohol with a molecular weight of 170,000 to 220,000.

[0048] The modified cellulose ether is carboxymethyl cellulose;

[0049] Natural polysaccharides are composed of xanthan gum, alginate, guar gum and cellulose, with the four substances in a ratio of 4:2:2:1.

[0050] The synthesized copolymer is a styrene-acrylate copolymer;

[0051] The material matrix is ​​composed of the following raw materials in parts by weight: 385 parts ordinary Portland cement, 480 parts fly ash, and 86 parts active admixture.

[0052] The active admixture is composed of microsphere powder, stone powder, silica fume and anhydrite powder in a ratio of 1:1:1:1.

[0053] Microbead powder specific surface area ≥ 1000m² 2 / kg, 28-day activity index ≥90%, SiO2 content in silica fume ≥85%, 28-day activity index ≥85%, stone powder specific surface area ≥800m² 2 / kg, SO3 content of anhydrite powder ≥48%.

[0054] Example 1

[0055] A method for preparing a diffusion boundary controllable grouting material for underwater deposition reinforcement includes the following steps:

[0056] Step 1: Place the 160mm×40mm×40mm mold into the water tank and add water to the tank until it reaches 10cm above the top surface of the mold;

[0057] Step 2: Weigh the raw materials by mass fraction, including 900 parts of the material matrix component, 0 parts of the comprehensive additive, 50 parts of the instant sodium silicate, and 700 parts of water.

[0058] Step 3: Mix the material matrix components and the comprehensive additives evenly;

[0059] Step 4: Pour the mixture obtained in Step 3 into water, and then mix it with a concrete mixer for 180 seconds;

[0060] Step 5: Add the instant sodium silicate to the mixture obtained in Step 4 and stir until homogeneous;

[0061] Step 6: Pour the mixture obtained in Step 5 from the water surface into the mold until the pouring volume exceeds the surface of the mold;

[0062] Step 7: Keep the mold in its current state and allow it to cure in water for 28 days;

[0063] The results of measuring the performance parameters of the diffusion boundary controllable grouting material prepared in this embodiment for underwater deposit reinforcement, including grout fluidity, setting time, and underwater performance, are shown in the table below:

[0064] Table 1-1 Slurry Flowability of Diffusion Boundary Controlled Grouting Materials Used for Underwater Deposition Reinforcement

[0065]

[0066] Flowability is an important indicator for measuring the fluidity of grout. The method used is the fluidity evaluation section of cement mortar in the national standard GB / T 50080-2016, "Standard for Test Methods of Performance of Ordinary Concrete Mixtures". Higher grout flowability indicates better fluidity and pumpability. Experimental results show that materials without added admixtures have very poor fluidity.

[0067] Table 1-2 Setting Time of Diffusion Boundary Controlled Grouting Material for Underwater Deposits Reinforcement

[0068]

[0069] Setting time represents the time required for a material to change from a liquid to a solid state. The setting time test for cement slurry (cement paste) is conducted according to the national standard GB / T1346-2024, "Test Methods for Standard Consistency Water Requirement, Setting Time and Soundness of Cement". A longer setting time provides a more sufficient time window for grouting, but also increases the material's strength, leading to insufficient support for the grout piled above, thus prolonging the construction process. Conversely, a setting time that is too short can cause pumping difficulties. Experimental results show that the setting time of the material in this mix meets the construction requirements.

[0070] Table 1-3 Underwater performance of diffusion boundary controlled grouting materials used for underwater embankment reinforcement

[0071]

[0072] The underwater anti-dispersion and stacking height of the material are important properties for measuring whether the underwater boundary of the material is controllable and can complete the filling. The loss amount and suspended solids content in JTG 3420-2020 were tested to determine the anti-dispersion performance. The test results showed that without the addition of comprehensive admixtures, the material had no anti-dispersion ability, could not be retained, and had no stacking height.

[0073] Example 2

[0074] A method for preparing a diffusion boundary controllable grouting material for underwater deposition reinforcement includes the following steps:

[0075] Step 1: Place the 160mm×40mm×40mm mold into the water tank and add water to the tank until it reaches 10cm above the top surface of the mold;

[0076] Step 2: Weigh the raw materials by mass fraction, including 800 parts of the material matrix component, 5 parts of the comprehensive additive, 50 parts of the instant sodium silicate, and 800 parts of water.

[0077] Step 3: Mix the material matrix components and the comprehensive additives evenly;

[0078] Step 4: Pour the mixture obtained in Step 3 into water, and then mix it with a concrete mixer for 180 seconds;

[0079] Step 5: Add the instant sodium silicate to the mixture obtained in Step 4 and stir until homogeneous;

[0080] Step 6: Pour the mixture obtained in Step 5 from the water surface into the mold until the pouring volume exceeds the surface of the mold;

[0081] Step 7: Keep the mold in its current state and allow it to cure in water for 28 days;

[0082] The results of measuring the performance parameters of the diffusion boundary controllable grouting material prepared in this embodiment for underwater deposit reinforcement, including grout fluidity, setting time, and underwater performance, are shown in the table below:

[0083] Table 2-1 Slurry Flowability of Diffusion Boundary Controlled Grouting Materials Used for Underwater Deposits Reinforcement

[0084]

[0085] Experimental results show that the fluidity of the slurry was improved after using a comprehensive admixture and increasing the water-cement ratio.

[0086] Table 2-2 Setting Time of Diffusion Boundary Controlled Grouting Material for Underwater Deposits Reinforcement

[0087]

[0088] Experimental results show that the setting time is greatly extended after using a comprehensive admixture and increasing the water-cement ratio.

[0089] Table 2-3 Underwater performance of diffusion boundary controlled grouting materials used for underwater embankment reinforcement

[0090]

[0091] Experimental results show that this formulation has certain anti-dispersion properties, but the slurry is not in paste form, the stacking height is small, and the stacking effect is poor.

[0092] Example 3

[0093] A method for preparing a diffusion boundary controllable grouting material for underwater deposition reinforcement includes the following steps:

[0094] Step 1: Place the 160mm×40mm×40mm mold into the water tank and add water to the tank until it reaches 10cm above the top surface of the mold;

[0095] Step 2: Weigh the raw materials by mass fraction, including 900 parts of the material matrix component, 15 parts of the comprehensive additive, 0 parts of the instant sodium silicate, and 700 parts of water.

[0096] Step 3: Mix the material matrix components and the comprehensive additives evenly;

[0097] Step 4: Pour the mixture obtained in Step 3 into water, and then mix it with a concrete mixer for 180 seconds;

[0098] Step 5: Add the instant sodium silicate to the mixture obtained in Step 4 and stir until homogeneous;

[0099] Step 6: Pour the mixture obtained in Step 5 from the water surface into the mold until the pouring volume exceeds the surface of the mold;

[0100] Step 7: Keep the mold in its current state and allow it to cure in water for 28 days;

[0101] The results of measuring the performance parameters of the diffusion boundary controllable grouting material prepared in this embodiment for underwater deposit reinforcement, including grout fluidity, setting time, and underwater performance, are shown in the table below:

[0102] Table 3-1 Slurry Flowability of Diffusion Boundary Controlled Grouting Materials Used for Underwater Deposits Reinforcement

[0103]

[0104] Experimental results show that increasing the dosage of the composite admixture and omitting the use of readily soluble sodium silicate further improves the fluidity of the slurry.

[0105] Table 3-2 Setting Time of Diffusion Boundary Controlled Grouting Material for Underwater Deposits Reinforcement

[0106]

[0107] Experimental results show that, by increasing the dosage of the comprehensive admixture and without using readily soluble sodium silicate, the setting time is slightly extended, which meets the construction requirements.

[0108] Table 3-3 Underwater performance of diffusion boundary controlled grouting materials used for underwater embankment reinforcement

[0109]

[0110] Experimental results show that the slurry without the use of readily soluble sodium silicate is in a non-paste state, has no accumulation properties when injected underwater, and does not meet the construction requirements.

[0111] Example 4

[0112] A method for preparing a diffusion boundary controllable grouting material for underwater deposition reinforcement includes the following steps:

[0113] Step 1: Place the 160mm×40mm×40mm mold into the water tank and add water to the tank until it reaches 10cm above the top surface of the mold;

[0114] Step 2: Weigh the raw materials by mass fraction, including 900 parts of the material matrix component, 15 parts of the comprehensive additive, 100 parts of the instant sodium silicate, and 700 parts of water.

[0115] Step 3: Mix the material matrix components and the comprehensive additives evenly;

[0116] Step 4: Pour the mixture obtained in Step 3 into water, and then mix it with a concrete mixer for 180 seconds;

[0117] Step 5: Add the instant sodium silicate to the mixture obtained in Step 4 and stir until homogeneous;

[0118] Step 6: Pour the mixture obtained in Step 5 from the water surface into the mold until the pouring volume exceeds the surface of the mold;

[0119] Step 7: Keep the mold in its current state and allow it to cure in water for 28 days;

[0120] The results of measuring the performance parameters of the diffusion boundary controllable grouting material prepared in this embodiment for underwater embankment reinforcement, including grout fluidity, setting time, and underwater performance, are shown in Tables 1, 2, and 3.

[0121] Table 4-1 Slurry Flowability of Diffusion Boundary Controlled Grouting Materials Used for Underwater Deposition Reinforcement

[0122]

[0123] Experimental results show that increasing the dosage of readily soluble sodium silicate reduces the fluidity of the slurry.

[0124] Table 4-2 Setting Time of Diffusion Boundary Controlled Grouting Material for Underwater Deposits Reinforcement

[0125]

[0126] Experimental results show that low amounts of readily soluble sodium silicate in the grouting material do not affect the setting time.

[0127] Table 4-3 Underwater performance of diffusion boundary controlled grouting materials used for underwater embankment reinforcement

[0128]

[0129] Experimental results show that the grouting material with this ratio has a paste-like state, good stacking properties, and both its anti-dispersion and stacking properties meet the construction requirements.

[0130] Example 5

[0131] A method for preparing a diffusion boundary controllable grouting material for underwater deposition reinforcement includes the following steps:

[0132] Step 1: Place the 160mm×40mm×40mm mold into the water tank and add water to the tank until it reaches 10cm above the top surface of the mold;

[0133] Step 2: Weigh the raw materials according to the mass fraction, including 1000 parts of the material matrix component, 25 parts of the comprehensive additive, 100 parts of the instant sodium silicate, and 800 parts of water.

[0134] Step 3: Mix the material matrix components and the comprehensive additives evenly;

[0135] Step 4: Pour the mixture obtained in Step 3 into water, and then mix it with a concrete mixer for 180 seconds;

[0136] Step 5: Add the instant sodium silicate to the mixture obtained in Step 4 and stir until homogeneous;

[0137] Step 6: Pour the mixture obtained in Step 5 from the water surface into the mold until the pouring volume exceeds the surface of the mold;

[0138] Step 7: Keep the mold in its current state and allow it to cure in water for 28 days;

[0139] The results of measuring the performance parameters of the diffusion boundary controllable grouting material prepared in this embodiment for underwater deposit reinforcement, including grout fluidity, setting time, and underwater performance, are shown in the table below:

[0140] Table 5-1 Slurry Flowability of Diffusion Boundary Controlled Grouting Materials Used for Underwater Deposition Reinforcement

[0141]

[0142] Experimental results show that the fluidity is greatly increased after adding a large amount of comprehensive additives.

[0143] Table 5-2 Setting Time of Diffusion Boundary Controlled Grouting Material for Underwater Deposits Reinforcement

[0144]

[0145] Experimental results show that increasing the dosage of the composite admixture significantly prolongs the setting time, which does not meet the requirements for continuous construction.

[0146] Table 5-3 Underwater performance of diffusion boundary controlled grouting materials used for underwater embankment reinforcement

[0147]

[0148] Experimental results show that the grouting material with this ratio meets the requirements for underwater anti-dispersion performance, the grout is in paste form, and the accumulation height is relatively large.

[0149] Example 6

[0150] A method for preparing a diffusion boundary controllable grouting material for underwater deposition reinforcement includes the following steps:

[0151] Step 1: Place the 160mm×40mm×40mm mold into the water tank and add water to the tank until it reaches 10cm above the top surface of the mold;

[0152] Step 2: Weigh the raw materials according to the mass fraction, including 1000 parts of the material matrix component, 20 parts of the comprehensive additive, 200 parts of the instant sodium silicate, and 600 parts of water.

[0153] Step 3: Mix the material matrix components and the comprehensive additives evenly;

[0154] Step 4: Pour the mixture obtained in Step 3 into water, and then mix it with a concrete mixer for 180 seconds;

[0155] Step 5: Add the instant sodium silicate to the mixture obtained in Step 4 and stir until homogeneous;

[0156] Step 6: Pour the mixture obtained in Step 5 from the water surface into the mold until the pouring volume exceeds the surface of the mold;

[0157] Step 7: Keep the mold in its current state and allow it to cure in water for 28 days;

[0158] The results of measuring the performance parameters of the diffusion boundary controllable grouting material prepared in this embodiment for underwater deposit reinforcement, including grout fluidity, setting time, and underwater performance, are shown in the table below:

[0159] Table 6-1 Slurry Flowability of Diffusion Boundary Controlled Grouting Materials Used for Underwater Deposits Reinforcement

[0160]

[0161] Experimental results show that at a lower water-cement ratio, the fluidity of the slurry is significantly reduced.

[0162] Table 6-2 Setting Time of Diffusion Boundary Controlled Grouting Material for Underwater Deposits Reinforcement

[0163]

[0164] Experimental results show that with a large amount of readily soluble sodium silicate and a small water-cement ratio, the setting time of the material is greatly shortened, making it difficult to apply in actual field conditions.

[0165] Table 6-3 Underwater performance of diffusion boundary controlled grouting materials used for underwater embankment reinforcement

[0166]

[0167] Experimental results show that the grouting material with this ratio meets the requirements for underwater anti-dispersion performance, the grout is in paste form, and it has good stacking performance and a large stacking height.

[0168] Comparative Example 1

[0169] The difference from Example 4 is that the polymer component is omitted in the comprehensive additive, while the total amount remains the same.

[0170] A method for preparing a diffusion boundary controllable grouting material for underwater deposition reinforcement includes the following steps:

[0171] Step 1: Place the 160mm×40mm×40mm mold into the water tank and add water to the tank until it reaches 10cm above the top surface of the mold;

[0172] Step 2: Weigh the raw materials by mass fraction, including 900 parts of the material matrix component, 15 parts of the comprehensive additive (without added polymer), 100 parts of the instant sodium silicate, and 700 parts of water.

[0173] Step 3: Mix the material matrix components and the comprehensive additives evenly;

[0174] Step 4: Pour the mixture obtained in Step 3 into water, and then mix it with a concrete mixer for 180 seconds;

[0175] Step 5: Add the instant sodium silicate to the mixture obtained in Step 4 and stir until homogeneous;

[0176] Step 6: Pour the mixture obtained in Step 5 from the water surface into the mold until the pouring volume exceeds the surface of the mold;

[0177] Step 7: Keep the mold in its current state and allow it to cure in water for 28 days;

[0178] The results of measuring the performance parameters of the diffusion boundary controllable grouting material prepared in this embodiment for underwater deposit reinforcement, including grout fluidity, setting time, and underwater performance, are shown in the table below:

[0179] Table C1-1 Grout Flowability of Diffusion Boundary Controlled Grouting Materials for Underwater Deposits Reinforcement

[0180]

[0181] Experimental results show that the fluidity of the slurry does not change significantly when no polymer is added.

[0182] Table C1-2 Setting Time of Diffusion Boundary Controlled Grouting Material for Underwater Deposits Reinforcement

[0183]

[0184] Experimental results show that not adding polymers to the grouting material reduces the setting time.

[0185] Table C1-3 Underwater performance of diffusion boundary controlled grouting materials used for underwater embankment reinforcement

[0186]

[0187] Experimental results show that the grouting material with this ratio has certain stacking and anti-dispersion properties, but its anti-dispersion properties are significantly reduced and it is prone to segregation in still water or under static conditions.

[0188] Comparative Example 2

[0189] The difference from Example 4 is that the modified cellulose ether component is omitted from the comprehensive additive, while the total amount remains the same.

[0190] A method for preparing a diffusion boundary controllable grouting material for underwater deposition reinforcement includes the following steps:

[0191] Step 1: Place the 160mm×40mm×40mm mold into the water tank and add water to the tank until it reaches 10cm above the top surface of the mold;

[0192] Step 2: Weigh the raw materials by mass fraction, including 900 parts of the material matrix component, 15 parts of the comprehensive additive (without modified cellulose ether), 100 parts of the instant sodium silicate, and 700 parts of water.

[0193] Step 3: Mix the material matrix components and the comprehensive additives evenly;

[0194] Step 4: Pour the mixture obtained in Step 3 into water, and then mix it with a concrete mixer for 180 seconds;

[0195] Step 5: Add the instant sodium silicate to the mixture obtained in Step 4 and stir until homogeneous;

[0196] Step 6: Pour the mixture obtained in Step 5 from the water surface into the mold until the pouring volume exceeds the surface of the mold;

[0197] Step 7: Keep the mold in its current state and allow it to cure in water for 28 days;

[0198] The results of measuring the performance parameters of the diffusion boundary controllable grouting material prepared in this embodiment for underwater deposit reinforcement, including grout fluidity, setting time, and underwater performance, are shown in the table below:

[0199] Table C2-1 Grout Flowability of Diffusion Boundary Controlled Grouting Materials for Underwater Deposits Reinforcement

[0200]

[0201] Experimental results show that the fluidity of the slurry does not change significantly without the addition of modified cellulose ether.

[0202] Table C2-2 Setting Time of Diffusion Boundary Controlled Grouting Material for Underwater Deposits Reinforcement

[0203]

[0204] Experimental results show that the absence of modified cellulose ether in grouting materials increases setting time, causing the materials to fail to meet on-site usage requirements.

[0205] Table C2-3 Underwater performance of diffusion boundary controlled grouting materials used for underwater embankment reinforcement

[0206]

[0207] Experimental results show that the packing performance of the grouting material is not significantly reduced under this ratio, but its dynamic water anti-dispersion performance is significantly reduced.

[0208] Meanwhile, a comparison of Example 4 with Comparative Examples 1 and 2 shows that the combination of polymer and modified cellulose ether effectively improves the packing performance of grouting materials.

[0209] Comparative Example 3

[0210] The difference from Example 4 is that the natural polysaccharide component is omitted from the comprehensive additive, while the total amount remains the same.

[0211] A method for preparing a diffusion boundary controllable grouting material for underwater deposition reinforcement includes the following steps:

[0212] Step 1: Place the 160mm×40mm×40mm mold into the water tank and add water to the tank until it reaches 10cm above the top surface of the mold;

[0213] Step 2: Weigh the raw materials by mass fraction, including 900 parts of the material matrix component, 15 parts of the comprehensive additive (without added natural polysaccharides), 100 parts of instant sodium silicate, and 700 parts of water.

[0214] Step 3: Mix the material matrix components and the comprehensive additives evenly;

[0215] Step 4: Pour the mixture obtained in Step 3 into water, and then mix it with a concrete mixer for 180 seconds;

[0216] Step 5: Add the instant sodium silicate to the mixture obtained in Step 4 and stir until homogeneous;

[0217] Step 6: Pour the mixture obtained in Step 5 from the water surface into the mold until the pouring volume exceeds the surface of the mold;

[0218] Step 7: Keep the mold in its current state and allow it to cure in water for 28 days;

[0219] The results of measuring the performance parameters of the diffusion boundary controllable grouting material prepared in this embodiment for underwater deposit reinforcement, including grout fluidity, setting time, and underwater performance, are shown in the table below:

[0220] Table C3-1 Slurry Flowability of Diffusion Boundary Controlled Grouting Materials for Underwater Deposits Reinforcement

[0221]

[0222] Experimental results show that the fluidity of the slurry does not change significantly when no natural polysaccharides are added.

[0223] Table C3-2 Setting Time of Diffusion Boundary Controlled Grouting Material for Underwater Deposits Reinforcement

[0224]

[0225] Experimental results show that not adding natural polysaccharides to the grouting material reduces the setting time.

[0226] Table C3-3 Underwater performance of diffusion boundary controlled grouting materials for underwater embankment reinforcement

[0227]

[0228]

[0229] Experimental results show that the packing performance of the grouting material decreased under this ratio, but its anti-dispersion performance did not change significantly, and its long-term stability decreased.

[0230] Comparative Example 4

[0231] The difference from Example 4 is that the synthetic copolymer component is omitted from the composite additive, while the total amount remains the same.

[0232] A method for preparing a diffusion boundary controllable grouting material for underwater deposition reinforcement includes the following steps:

[0233] Step 1: Place the 160mm×40mm×40mm mold into the water tank and add water to the tank until it reaches 10cm above the top surface of the mold;

[0234] Step 2: Weigh the raw materials by mass fraction, including 900 parts of the material matrix component, 15 parts of the comprehensive additive (without added synthetic copolymer), 100 parts of instant sodium silicate, and 700 parts of water.

[0235] Step 3: Mix the material matrix components and the comprehensive additives evenly;

[0236] Step 4: Pour the mixture obtained in Step 3 into water, and then mix it with a concrete mixer for 180 seconds;

[0237] Step 5: Add the instant sodium silicate to the mixture obtained in Step 4 and stir until homogeneous;

[0238] Step 6: Pour the mixture obtained in Step 5 from the water surface into the mold until the pouring volume exceeds the surface of the mold;

[0239] Step 7: Keep the mold in its current state and allow it to cure in water for 28 days;

[0240] The results of measuring the performance parameters of the diffusion boundary controllable grouting material prepared in this embodiment for underwater deposit reinforcement, including grout fluidity, setting time, and underwater performance, are shown in the table below:

[0241] Table C4-1 Grout Flowability of Diffusion Boundary Controlled Grouting Materials for Underwater Deposits Reinforcement

[0242]

[0243] Experimental results show that the fluidity of the slurry is reduced when no synthetic copolymer is added.

[0244] Table C4-2 Setting Time of Diffusion Boundary Controlled Grouting Material for Underwater Deposits Reinforcement

[0245]

[0246] Experimental results show that not adding synthetic copolymers to the grouting material reduces the setting time.

[0247] Table C4-3 Underwater performance of diffusion boundary controlled grouting materials for underwater embankment reinforcement

[0248]

[0249] Experimental results show that the packing performance of the grouting material is slightly reduced under this ratio, but its anti-dispersion performance is also reduced.

[0250] As can be seen from the comparison between Example 4 and Comparative Examples 1 and 4, the combination of polymer and synthetic copolymer can better improve the fluidity and packing performance of grouting material.

[0251] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A diffusive boundary controllable grouting material for underwater accumulation reinforcement, characterized by, The diffusion boundary controllable grouting material for underwater heap reinforcement is prepared from the following raw materials by weight: 800-1000 parts of a material matrix component, 5-25 parts of a comprehensive admixture, 50-200 parts of instant sodium silicate, and 600-800 parts of water. The material matrix component is prepared from the following raw materials by weight: 270-500 parts of ordinary Portland cement, 360-600 parts of fly ash, and 72-100 parts of active admixture. The comprehensive admixture comprises an anti-dispersion agent and a water reducing agent. The anti-dispersion agent is prepared from the following raw materials by weight: 7-8 parts of a high polymer, 9-10 parts of carboxymethyl cellulose, 1-3 parts of natural polysaccharide, and 1-2 parts of synthetic copolymer. The high polymer is composed of polyacrylamide and polyvinyl alcohol, and the weight ratio of the two substances is 5:2~5:3; the natural polysaccharide is composed of xanthan gum, alginate, guar gum and cellulose, and the weight ratio of the four substances is 4:2:2:1; and the synthetic copolymer is an acrylate copolymer. The water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the weight of the water reducing agent is 3-5 parts.

2. A diffusive boundary controlled grouting material for underwater accumulation reinforcement according to claim 1, characterized in that, The comprehensive admixture is prepared by the following steps, comprising: The high polymer, carboxymethyl cellulose, natural polysaccharide, synthetic copolymer and water reducing agent are mixed uniformly to obtain the comprehensive admixture.

3. A diffusive boundary controlled grouting material for underwater accumulation reinforcement according to claim 1, characterized in that, The active admixture is composed of microbead powder, stone powder, silica fume and anhydrite powder.

4. The method of claim 1, wherein the diffusion boundary controlled grouting material for underwater accumulation reinforcement is prepared by mixing the cement, the water, the water-soluble polymer, and the water-soluble inorganic salt in the water, and then adding the water-soluble organic solvent to the mixture. Comprising: The Portland cement, fly ash and active admixture are mixed uniformly to prepare a diffusion boundary controllable grouting material matrix for underwater goaf filling; The material matrix and the comprehensive admixture are mixed uniformly, and then the obtained material is mixed with water, and finally mixed with instant sodium silicate to prepare the diffusion boundary controllable grouting material for underwater heap reinforcement.

5. The application of the grouting material of claim 1 or 3 in goaf construction.

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