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

Abstract

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

Description

Technical Field

[0001] The present invention 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 Art

[0002] Disclosing the information of this background art section is only intended to increase the understanding of the overall background of the present invention, and is not necessarily regarded as an admission or an implication in any form that this information constitutes the prior art already known to those of ordinary skill in the art.

[0003] The technology of grouting and filling treatment for goafs has been paid more and more attention at the present stage, and it is required to effectively avoid the adverse effects and hazards brought by goafs. Based on the necessity of treating goafs, combined with the current development of goaf treatment work, there are mainly treatment methods such as caving method, filling method and sealing method. Among them, the filling method is the most widely used and can fundamentally solve the problems of goafs, and also has a strong supporting effect on the subsequent application of goafs. After filling treatment for goafs, its overall bearing capacity can surely be effectively improved, and the subsequent settlement and collapse risks that may occur can be effectively avoided. Specifically in the application of goaf filling method, the application of grouting and filling treatment technology is a relatively representative way. However, for the filling of underwater goafs, there are disadvantages in the current traditional anti-dispersive materials, such as slow setting speed, inability to stay in the underwater area with uncertain boundaries, and difficulty in accumulation. Summary of the Invention

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

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

[0006] In the first aspect of the present invention, a comprehensive admixture is provided, including: an anti-dispersant and a water reducer;

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

[0008] Among them, the polymer and the modified cellulose ether jointly construct a physical cross-linked network, which can improve water retention and stability; the synthetic copolymer combines with the polymer network while reducing water, achieving a balance between viscosity and fluidity, and enhancing the anti-scouring property can optimize the dispersion efficiency of the polymer; natural polysaccharides can enhance the water retention effect of the modified cellulose ether, supplement the thickening effect of the polymer and cellulose ether, and can enhance the network structure through hydrogen bonds.

[0009] The above components are combined in proportion, and through their synergistic effects, this formulation can effectively maintain the integrity and anti-dispersion performance of the cement slurry in a complex environment. It is ensured that the comprehensive admixture of the present invention can significantly improve the anti-dispersion ability of the cement-based material underwater and adjust the flowability of the material.

[0010] In some embodiments, the polymer is composed of polyacrylamide and polyvinyl alcohol, and the weight ratio of the two substances is 5:2 to 5:3. Polyacrylamide is a high molecular polymer with a large number of polar groups on its molecular chain. In an underwater environment, these groups can adsorb suspended particles and cement particles in water through electrostatic interactions, forming larger flocs, thereby reducing the dispersion and loss of particles in water. Secondly, its long-chain structure can form a network structure in water, increasing the viscosity of the aqueous solution. This thickening effect can improve the stability of concrete or slurry and prevent it from dispersing in an underwater environment. Among them, polyvinyl alcohol is a water-soluble high molecular polymer, which can significantly increase the viscosity of the cement slurry. This thickening effect makes the cement slurry more difficult to be washed away and flow in a dynamic water environment. Preferably, the polyacrylamide used has a molecular weight of 8 million to 20 million, and the polyvinyl alcohol is a high-polymerization-degree polyvinyl alcohol with a molecular weight of 170,000 to 220,000.

[0011] In some embodiments, the modified cellulose ether is carboxymethyl cellulose. The molecular chain of carboxymethyl cellulose is complex, and special functional groups or groups are introduced, which can entangle and adsorb on the surface of cement particles in the cement slurry, forming a protective film, reducing the contact between cement particles and water, and reducing particle dispersion. 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 weight ratio of the four substances is 4:2:2:1. The molecular chains of xanthan gum can interact with each other to form a network structure, wrapping the cement particles, restricting their free movement, and reducing dispersion and loss in the water flow. Alginate is a natural polysaccharide polymer that can form a stable three-dimensional network structure in water. This structure can effectively prevent the dispersion and loss of particles, thereby improving the stability of the material underwater. Preferably, the molecular weight of xanthan gum is 2 million to 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 to wrap the cement particles, prevent the particles from contacting water excessively, reduce the hydration reaction rate, prevent particle collision and dispersion, and it has surface activity, which can reduce the surface tension of water, thereby reducing the dispersion of the material in water. This property enables it to exhibit good anti-dispersion performance in materials such as underwater concrete and slurry.

[0014] In some embodiments, the water reducing agent is a polycarboxylate superplasticizer. The water reducing agent is 3 - 5 parts by weight. The surface active effect of the polycarboxylate water reducing agent can increase the dispersibility and fluidity of the cement slurry through dispersion, lubrication, and wetting.

[0015] The second aspect of the present invention provides a preparation method of a comprehensive admixture, including:

[0016] Mixing the polymer, modified cellulose ether, natural polysaccharide polymer, synthetic copolymer, and water reducing agent evenly to obtain it.

[0017] The third aspect of the present invention provides a diffusion boundary controllable grouting material for underwater stacking reinforcement, which is composed of the following raw materials in parts by weight: 800 - 1000 parts of the material matrix component, 0 - 25 parts of the above-mentioned comprehensive admixture, 0 - 200 parts of instant sodium silicate, and 600 - 800 parts of water;

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

[0019] In some embodiments, the active admixture consists of microsphere powder, stone powder, silica fume and anhydrite powder. The microsphere powder is in the shape of spherical particles and has a "ball bearing" effect, which can significantly reduce the viscosity of concrete, increase the fluidity of the paste, and also has high activity. It can react with the hydration products of cement to form 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, and reduce the porosity of hardened cement paste, thereby improving the durability of concrete. Anhydrite can react with the hydration products of cement in concrete or mortar to form hydration products such as ettringite, which fill the pores in the cement stone, thereby improving the early strength. The incorporation of an appropriate amount of anhydrite can improve the fluidity of concrete or mortar. Its fine powder form can reduce the friction between aggregates to a certain extent, making the mixture of concrete or mortar more uniform and having better fluidity. Anhydrite itself has a certain resistance to sulfate erosion. After being incorporated into concrete or mortar, it can improve the sulfate erosion resistance of the material and enhance its durability in harsh environments. The particles of stone powder are fine and can fill the microvoids in concrete or mortar, increasing the density of the material, thereby improving the compressive strength and flexural strength. The silica component in stone powder has a positive effect on the carbonation resistance of concrete and can improve the durability of concrete. Silica fume can significantly improve the compressive strength and flexural strength of concrete. Its ultra-fine particles can fill the microvoids in cement stone, increasing the density of the material, thereby improving the strength. Silica fume can significantly improve the durability of concrete in harsh environments such as chloride pollution erosion and sulfate erosion, and the service life can be doubled or even several times. The specific surface area of microsphere powder ≥ 1000m 2 / kg, and the 28-day activity index ≥ 90%. The SiO 2 content in silica fume ≥ 85%, and the 28-day activity index ≥ 85%. The specific surface area of stone powder ≥ 800m 2 / kg, and the SO 3 content in anhydrite powder ≥ 48%.

[0020] In some embodiments, the diffusion boundary controllable grouting material for underwater stacking reinforcement, by weight, comprises the following component materials: 900 parts of matrix component, 0 part 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 stacking reinforcement, by weight, comprises the following component materials: 800 parts of 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 stacking reinforcement, by weight, comprises the following component materials: 900 parts of matrix component, 15 parts of comprehensive admixture, 0 part of instant sodium silicate, and 700 parts of water.

[0023] In some embodiments, the diffusion boundary controllable grouting material for underwater accumulation reinforcement, by weight, comprises the following components: 900 parts of material matrix component, 15 parts of comprehensive admixture, 100 parts of instant sodium silicate, and 700 parts of water.

[0024] In some embodiments, the diffusion boundary controllable grouting material for underwater accumulation reinforcement, by weight, comprises the following components: 1000 parts of material matrix component, 25 parts of comprehensive admixture, 100 parts of instant sodium silicate, and 800 parts of water.

[0025] In some embodiments, the diffusion boundary controllable grouting material for underwater accumulation reinforcement, by weight, comprises the following components: 1000 parts of material matrix component, 20 parts of comprehensive admixture, 200 parts of instant sodium silicate, and 600 parts of water.

[0026] The fourth aspect of the present invention provides a preparation method of a diffusion boundary controllable grouting material for underwater accumulation reinforcement, comprising:

[0027] Mixing portland cement, fly ash and active admixture evenly to obtain a diffusion boundary controllable grouting material matrix for filling underwater goafs;

[0028] First, mixing the material matrix and the comprehensive admixture evenly, then putting the obtained material into water and mixing evenly, and finally mixing evenly with instant sodium silicate to obtain a diffusion boundary controllable grouting material for underwater accumulation reinforcement.

[0029] More specifically, it includes:

[0030] Put a mold with dimensions of 160mm×40mm×40mm into a water tank, and add water to the water tank to a height of 10 cm above the upper surface of the mold;

[0031] Weigh the raw materials by weight;

[0032] Mix the material matrix component and the comprehensive admixture evenly;

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

[0034] Add instant sodium silicate to the mixture obtained in the previous step and stir evenly;

[0035] Pour the mixture obtained in the previous step from the water surface into the mold until the pouring amount exceeds the surface of the mold;

[0036] Place it in water and cure at room temperature.

[0037] The fifth aspect of the present invention provides the application of the above grouting material in the construction of goafs.

[0038] Advantages 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, have stable interfacial bonding with inorganic concrete, have good anti-aging performance, and are safe, non-toxic, and pollution-free.

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

[0041] (3) In view of the problems that ordinary cement-based materials with anti-dispersion ability are difficult to accumulate in the borderless area and ordinary quick-setting slurries have poor anti-dispersion performance in water, the present invention proposes an optimized comprehensive admixture and a diffusion boundary controllable grouting material for underwater accumulation reinforcement and its preparation method, which strengthens the anti-dispersion ability and accumulation ability of the filling material in the underwater borderless area of the goaf, and improves the filling effect of the borderless underwater goaf. Detailed implementation manners

[0042] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0043] The following combines specific embodiments to make a further detailed description of the present invention. It should be noted that the specific embodiments are explanations rather than limitations of the present invention.

[0044] In the following embodiments, the comprehensive admixture includes: 20.5 parts of anti-dispersant and 4 parts of water reducer;

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

[0046] The water reducer is a polycarboxylate superplasticizer, a commercially available product.

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

[0048] The modified cellulose ether is carboxymethyl cellulose;

[0049] 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.

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

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

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

[0053] The specific surface area of the microsphere powder is ≥1000 m 2 / kg, and the 28-day activity index is ≥90%. The SiO 2 content in the silica fume is ≥85%, and the 28-day activity index is ≥85%. The specific surface area of the stone powder is ≥800 m 2 / kg, and the SO 3 content in the anhydrite powder is ≥48%.

[0054] Example 1

[0055] A preparation method of a diffusion boundary controllable grouting material for underwater stacking reinforcement includes the following steps:

[0056] Step 1: Place a mold with dimensions of 160 mm × 40 mm × 40 mm in a water tank, and add water to the water tank to a level 10 cm above the upper 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 admixture, 50 parts of instant sodium silicate, and 700 parts of water.

[0058] Step 3: Mix the material matrix component and the comprehensive admixture evenly;

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

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

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

[0062] Step 7: Keep the mold in a certain state and cure it in water for 28 days;

[0063] The measurement results of the performance parameters such as slurry fluidity, setting time, and underwater performance of the diffusion boundary controllable grouting material for underwater stacking reinforcement prepared in this example are shown in the following table:

[0064] Table 1-1 Slurry fluidity of the diffusion boundary controllable grouting material for underwater stacking reinforcement

[0065]

[0066] The fluidity is an important index to measure the fluidity of the slurry. The method for evaluating the fluidity of the cement mortar in the national standard GB / T 50080-2016 "Standard Test Methods for Properties of Ordinary Concrete Mixtures" is adopted. The greater the fluidity of the slurry, the better the fluidity of the slurry, and at the same time, the better the pumpability. The experimental results show that the fluidity of the material without adding the comprehensive admixture is very poor.

[0067] Table 1-2 Setting time of the grouting material with controllable diffusion boundary for underwater accumulation reinforcement

[0068]

[0069] The setting time represents the time required for the material to change from a liquid state to a solid state. The requirements for testing the setting time of the cement slurry (cement paste) in the national standard GB / T1346-2024 "Test Methods for Water Requirement for Normal Consistency, Setting Time and Soundness of Cement" are adopted. The longer the setting time of the material, the more sufficient the time window for grouting construction. However, at the same time, the curing time of the material is prolonged, and the lack of support for the overlying grouting material due to insufficient material strength will lead to an extension of the construction progress. If the setting time is too short, it will cause difficulties in pumping. The experimental results show that the setting time of the material with this ratio meets the construction requirements.

[0070] Table 1-3 Underwater properties of the grouting material with controllable diffusion boundary for underwater accumulation reinforcement

[0071]

[0072] The underwater anti-dispersion property and stacking height of the material are important properties to measure whether the boundary of the material is controllable underwater and the filling is completed. The T0537-2020 standard in JTG 3420-2020 is used to test the loss amount and suspended matter content to judge the anti-dispersion property. The experimental results show that when the comprehensive admixture is not added, the material has no anti-dispersion ability at all, cannot be retained, and correspondingly has no stacking height.

[0073] Example 2

[0074] A preparation method of a grouting material with controllable diffusion boundary for underwater accumulation reinforcement, comprising the following steps:

[0075] Step 1: Place a mold with dimensions of 160mm×40mm×40mm in a water tank, and add water to the water tank to a height of 10 cm above the upper 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 admixture, 50 parts of the instant sodium silicate, and 800 parts of water.

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

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

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

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

[0081] Step 7: Keep the mold in a certain state and cure it in water for 28 days;

[0082] The measurement results of the performance parameters such as the slurry fluidity, setting time, and underwater performance of the diffusion boundary controllable grouting material prepared in this example for underwater stacking reinforcement are shown in the following table:

[0083] Table 2-1 Slurry fluidity of the diffusion boundary controllable grouting material for underwater stacking reinforcement

[0084]

[0085] The experimental results show that after using the comprehensive admixture and increasing the water-binder ratio, the fluidity of the slurry has increased.

[0086] Table 2-2 Setting time of the diffusion boundary controllable grouting material for underwater stacking reinforcement

[0087]

[0088] The experimental results show that after using the comprehensive admixture and increasing the water-binder ratio, the setting time has been greatly extended.

[0089] Table 2-3 Underwater performance of the diffusion boundary controllable grouting material for underwater stacking reinforcement

[0090]

[0091] The experimental results show that this formulation has a certain anti-dispersion performance, but the slurry state is not paste-like, the stacking height is small, and the stacking effect is not good.

[0092] Example 3

[0093] A preparation method of a diffusion boundary controllable grouting material for underwater stacking reinforcement, comprising the following steps:

[0094] Step 1: Place a mold with dimensions of 160 mm × 40 mm × 40 mm in a water tank, and add water to the water tank to a position 10 cm above the upper 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 admixture, 0 part of the instant sodium silicate, and 700 parts of water.

[0096] Step 3: Mix the material matrix component and the comprehensive admixture evenly.

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

[0098] Step 5: Add the instant sodium silicate to the mixture obtained in Step 4, and stir evenly.

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

[0100] Step 7: Keep the mold in a certain state and cure it in water for 28 days.

[0101] The measurement results of the performance parameters such as the slurry fluidity, setting time, and underwater performance of the diffusion boundary controllable grouting material prepared in this example are shown in the following table:

[0102] Table 3-1 Slurry Fluidity of the Diffusion Boundary Controllable Grouting Material for Underwater Accumulation Reinforcement

[0103]

[0104] The experimental results show that when the dosage of the comprehensive admixture is increased and the instant sodium silicate is not used, the fluidity of the slurry is further improved.

[0105] Table 3-2 Setting Time of the Diffusion Boundary Controllable Grouting Material for Underwater Accumulation Reinforcement

[0106]

[0107] The experimental results show that when the dosage of the comprehensive admixture is increased and the instant sodium silicate is not used, the setting time is slightly prolonged, meeting the construction requirements.

[0108] Table 3-3 Underwater Performance of the Diffusion Boundary Controllable Grouting Material for Underwater Accumulation Reinforcement

[0109]

[0110] The experimental results show that the slurry state without using instant sodium silicate is not paste, and it has no accumulation performance when injected underwater, not meeting the construction requirements.

[0111] Example 4

[0112] A preparation method of a diffusion boundary controllable grouting material for underwater accumulation reinforcement, comprising the following steps:

[0113] Step 1: Place a mold with dimensions of 160 mm × 40 mm × 40 mm into a water tank, and add water to the water tank up to 10 cm above the upper 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 admixture, 100 parts of the instant sodium silicate, and 700 parts of water.

[0115] Step 3: Mix the material matrix component and the comprehensive admixture evenly.

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

[0117] Step 5: Add the instant sodium silicate to the mixture obtained in Step 4, and stir evenly.

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

[0119] Step 7: Keep the mold in its state and cure it in water for 28 days.

[0120] The measurement results of the performance parameters such as the slurry fluidity, setting time, and underwater performance of the diffusion boundary controllable grouting material prepared in this example for underwater stacking reinforcement are shown in Tables 1, 2, and 3 as follows:

[0121] Table 4-1 Slurry Fluidity of the Diffusion Boundary Controllable Grouting Material for Underwater Stacking Reinforcement

[0122]

[0123] The experimental results show that after increasing the dosage of the instant sodium silicate, the fluidity of the slurry decreases.

[0124] Table 4-2 Setting Time of the Diffusion Boundary Controllable Grouting Material for Underwater Stacking Reinforcement

[0125]

[0126] The experimental results show that a low dosage of instant sodium silicate in the grouting material does not affect the setting time.

[0127] Table 4-3 Underwater Performance of the Diffusion Boundary Controllable Grouting Material for Underwater Stacking Reinforcement

[0128]

[0129] The experimental results show that under this ratio, the slurry state of the grouting material is paste-like, with good stacking performance, and both the anti-dispersion performance and the stacking performance meet the construction requirements.

[0130] Example 5

[0131] A preparation method of a diffusion boundary controllable grouting material for underwater accumulation reinforcement, comprising the following steps:

[0132] Step 1: Place a mold with dimensions of 160mm×40mm×40mm into a water tank, and add water to the water tank to a level 10 cm above the upper surface of the mold;

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

[0134] Step 3: Mix the material matrix component and the comprehensive admixture evenly;

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

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

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

[0138] Step 7: Keep the mold in a certain state and cure it in water for 28 days;

[0139] The measurement results of the performance parameters such as slurry fluidity, setting time, and underwater performance of the diffusion boundary controllable grouting material for underwater accumulation reinforcement prepared in this example are shown in the following table:

[0140] Table 5-1 Slurry fluidity of the diffusion boundary controllable grouting material for underwater accumulation reinforcement

[0141]

[0142] The experimental results show that after adding a large amount of the comprehensive admixture, the fluidity increases greatly.

[0143] Table 5-2 Setting time of the diffusion boundary controllable grouting material for underwater accumulation reinforcement

[0144]

[0145] The experimental results show that increasing the dosage of the comprehensive admixture greatly prolongs the setting time, which does not meet the requirements of continuous construction.

[0146] Table 5-3 Underwater performance of the diffusion boundary controllable grouting material for underwater accumulation reinforcement

[0147]

[0148] The experimental results show that the grouting material with this ratio meets the underwater anti-dispersion performance, the slurry state is paste-like, and the stacking height is relatively large.

[0149] Example 6

[0150] A preparation method of a diffusion boundary controllable grouting material for underwater stacking reinforcement includes the following steps:

[0151] Step 1: Place a mold with dimensions of 160 mm × 40 mm × 40 mm in a water tank, and add water to the water tank to a level 10 cm above the upper surface of the mold.

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

[0153] Step 3: Mix the material matrix component and the comprehensive admixture evenly.

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

[0155] Step 5: Add instant sodium silicate to the mixture obtained in Step 4 and stir evenly.

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

[0157] Step 7: Keep the mold in a certain state and cure it in water for 28 days.

[0158] The measurement results of performance parameters such as slurry fluidity, setting time, and underwater performance of the diffusion boundary controllable grouting material for underwater stacking reinforcement prepared in this example are shown in the following table:

[0159] Table 6-1 Slurry fluidity of the diffusion boundary controllable grouting material for underwater stacking reinforcement

[0160]

[0161] The experimental results show that under a relatively small water-binder ratio, the fluidity of the slurry decreases significantly.

[0162] Table 6-2 Setting time of the diffusion boundary controllable grouting material for underwater stacking reinforcement

[0163]

[0164] The experimental results show that under a large dosage of instant sodium silicate and a relatively small water-binder ratio, the setting time of the material is greatly shortened, making it not easy to be applied to the actual site.

[0165] Table 6-3 Underwater Performance of the Diffusion Boundary Controllable Grouting Material for Underwater Accumulation Reinforcement

[0166]

[0167] The experimental results show that the grouting material with this formulation meets the underwater anti-dispersion performance, the slurry state is paste-like, its accumulation performance is good, and the accumulation height is large.

[0168] Comparative Example 1

[0169] The difference from Example 4 is that the polymer component is omitted in the comprehensive admixture, and the total dosage remains unchanged.

[0170] A preparation method of a diffusion boundary controllable grouting material for underwater accumulation reinforcement includes the following steps:

[0171] Step 1: Place a mold with dimensions of 160mm×40mm×40mm in a water tank, and add water to the water tank to a height of 10 cm above the upper 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 admixture (without adding polymer), 100 parts of instant sodium silicate, and 700 parts of water.

[0173] Step 3: Mix the material matrix component and the comprehensive admixture evenly;

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

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

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

[0177] Step 7: Keep the mold in a certain state and cure it in water for 28 days;

[0178] The measurement results of performance parameters such as slurry fluidity, setting time, and underwater performance of the diffusion boundary controllable grouting material for underwater accumulation reinforcement prepared in this example are shown in the following table:

[0179] Table C1-1 Slurry Fluidity of the Diffusion Boundary Controllable Grouting Material for Underwater Accumulation Reinforcement

[0180]

[0181] The experimental results show that when the polymer is not added, the fluidity of the slurry changes little.

[0182] Table C1-2 Setting time of the diffusion boundary controllable grouting material for underwater accumulation reinforcement

[0183]

[0184] The experimental results show that not adding polymers to the grouting material will reduce the setting time.

[0185] Table C1-3 Underwater performance of the diffusion boundary controllable grouting material for underwater accumulation reinforcement

[0186]

[0187] The experimental results show that the slurry of the grouting material under this ratio has certain accumulation performance and anti-dispersion performance, but its anti-dispersion performance has a large degree of decline and it is prone to segregation under static water or static conditions.

[0188] Comparative Example 2

[0189] The difference from Example 4 is that the modified cellulose ether component is omitted from the comprehensive admixture, and the total dosage remains unchanged.

[0190] A preparation method of a diffusion boundary controllable grouting material for underwater accumulation reinforcement, comprising the following steps:

[0191] Step 1: Place a mold with dimensions of 160mm×40mm×40mm in a water tank, and add water to the water tank to a height of 10 cm above the upper 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 admixture (without adding modified cellulose ether), 100 parts of instant sodium silicate, and 700 parts of water.

[0193] Step 3: Mix the material matrix component and the comprehensive admixture evenly;

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

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

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

[0197] Step 7: Keep the mold in a state and cure it in water for 28 days;

[0198] The measurement results of the performance parameters such as slurry fluidity, setting time, and underwater performance of the diffusion boundary controllable grouting material for underwater accumulation reinforcement prepared in this example are shown in the following table:

[0199] Table C2-1 Slurry Fluidity of the Grouting Material with Controllable Diffusion Boundary for Underwater Accumulation Reinforcement

[0200]

[0201] The experimental results show that when the modified cellulose ether is not added, the fluidity of the slurry changes little.

[0202] Table C2-2 Setting Time of the Grouting Material with Controllable Diffusion Boundary for Underwater Accumulation Reinforcement

[0203]

[0204] The experimental results show that not adding the modified cellulose ether to the grouting material will increase the setting time, resulting in the material not meeting the on-site use requirements.

[0205] Table C2-3 Underwater Performance of the Grouting Material with Controllable Diffusion Boundary for Underwater Accumulation Reinforcement

[0206]

[0207] The experimental results show that the accumulation performance of the slurry of the grouting material under this ratio decreases little, but its anti-dispersion performance in flowing water decreases to a large extent.

[0208] At the same time, it can be seen from the comparison between Example 4 and Comparative Examples 1 and 2 that the combination of the polymer and the modified cellulose ether effectively improves the accumulation performance of the grouting material.

[0209] Comparative Example 3

[0210] The difference from Example 4 is that the natural polysaccharide component is omitted from the comprehensive admixture, and the total dosage remains unchanged.

[0211] A preparation method of a grouting material with controllable diffusion boundary for underwater accumulation reinforcement includes the following steps:

[0212] Step 1: Place a mold with dimensions of 160mm×40mm×40mm in a water tank, and add water to the water tank to a height of 10 cm above the upper 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 admixture (without adding natural polysaccharide), 100 parts of instant sodium silicate, and 700 parts of water.

[0214] Step 3: Mix the material matrix component and the comprehensive admixture evenly;

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

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

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

[0218] Step 7: Keep the mold in a certain state and cure it in water for 28 days;

[0219] The measurement results of performance parameters such as slurry fluidity, setting time, and underwater performance of the diffusion boundary controllable grouting material for underwater stacking reinforcement prepared in this example are shown in the following table:

[0220] Table C3-1 Slurry Fluidity of Diffusion Boundary Controllable Grouting Material for Underwater Stacking Reinforcement

[0221]

[0222] The experimental results show that when natural polysaccharide is not added, the fluidity of the slurry changes little.

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

[0224]

[0225] The experimental results show that not adding natural polysaccharide to the grouting material will reduce the setting time.

[0226] Table C3-3 Underwater Performance of Diffusion Boundary Controllable Grouting Material for Underwater Stacking Reinforcement

[0227]

[0228]

[0229] The experimental results show that under this ratio, the stacking performance of the slurry of the grouting material decreases, but its anti-dispersion performance changes little and its long-term stability decreases.

[0230] Comparative Example 4

[0231] The difference from Example 4 is that the synthetic copolymer component is omitted from the comprehensive admixture and the total dosage remains unchanged.

[0232] A preparation method of a diffusion boundary controllable grouting material for underwater stacking reinforcement, comprising the following steps:

[0233] Step 1: Place a mold with dimensions of 160mm×40mm×40mm in a water tank and add water to the water tank to a position 10 cm above the upper 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 admixture (without adding synthetic copolymer), 100 parts of instant sodium silicate, and 700 parts of water.

[0235] Step 3: Mix the material matrix component and the comprehensive admixture evenly.

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

[0237] Step 5: Add instant sodium silicate to the mixture obtained in Step 4 and stir evenly.

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

[0239] Step 7: Keep the mold in a certain state and cure it in water for 28 days.

[0240] The measurement results of the performance parameters such as the slurry fluidity, setting time, and underwater performance of the diffusion boundary controllable grouting material prepared in this example are shown in the following table:

[0241] Table C4-1 Slurry Fluidity of the Diffusion Boundary Controllable Grouting Material for Underwater Accumulation Reinforcement

[0242]

[0243] The experimental results show that when the synthetic copolymer is not added, the fluidity of the slurry decreases.

[0244] Table C4-2 Setting Time of the Diffusion Boundary Controllable Grouting Material for Underwater Accumulation Reinforcement

[0245]

[0246] The experimental results show that not adding the synthetic copolymer to the grouting material will reduce the setting time.

[0247] Table C4-3 Underwater Performance of the Diffusion Boundary Controllable Grouting Material for Underwater Accumulation Reinforcement

[0248]

[0249] The experimental results show that under this ratio, the stacking performance of the slurry of the grouting material slightly decreases, but its anti-dispersion performance decreases.

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

[0251] The above are only the preferred embodiments of the present invention and are 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 within the protection scope of the present invention.

Claims

1. A comprehensive admixture, characterized in that: include: anti-dispersants and water reducing agents; The anti-dispersant is mainly composed of the following raw materials in parts by weight: 7-8 parts of polymer, 9-10 parts of modified cellulose ether, 1-3 parts of natural polysaccharides and 1-2 parts of synthetic copolymer.

2. The comprehensive admixture according to claim 1, characterized in that: The high polymer consists of polyacrylamide and polyvinyl alcohol.

3. The comprehensive admixture according to claim 1, characterized in that: The modified cellulose ether is carboxymethyl cellulose.

4. The comprehensive admixture according to claim 1, characterized in that: The natural polysaccharide consists of xanthan gum, alginate, guar gum and cellulose.

5. The comprehensive admixture according to claim 1, characterized in that: The synthetic copolymer is an acrylate copolymer; Or, the water reducer is a polycarboxylic acid high performance water reducer; Or, the weight portion of the water reducing agent is 3-5 parts.

6. A method for preparing a comprehensive admixture, characterized in that: include: The polymer, modified cellulose ether, natural polysaccharide polymer, synthetic copolymer and water reducing agent are uniformly mixed to obtain the product.

7. A diffusion boundary controllable grouting material for underwater accumulation reinforcement, characterized in that: The invention is composed of the following raw materials in parts by weight: 800-1000 parts of a material matrix component, 0-25 parts of a comprehensive admixture according to any one of claims 1 to 5, 0-200 parts of instant sodium silicate, and 600-800 parts of water; The material matrix component is composed of the following raw materials in parts by weight: 270-500 parts of ordinary Portland cement, 360-600 parts of fly ash, and 72-100 parts of active admixture.

8. The diffusion boundary controllable grouting material for underwater pile reinforcement according to claim 7, characterized in that: The active admixture consists of micro-bead powder, stone powder, silica fume and anhydrite powder.

9. A method for preparing a diffusion boundary controllable grouting material for underwater pile reinforcement, characterized in that: include: The silicate cement, fly ash and active admixture are uniformly mixed to prepare a diffusion boundary controllable grouting material matrix for filling underwater goaf; The material matrix and the comprehensive admixture are firstly mixed evenly, then the obtained material is put into water and mixed evenly, and finally mixed evenly with the quick-dissolving sodium silicate to obtain the diffusion boundary controllable grouting material for underwater accumulation reinforcement.

10. Use of the grouting material according to claim 7 or 8 in goaf area construction.

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