An underwater anti-dispersion and anti-segregation grouting additive, a preparation method and application thereof

Abstract

The application discloses a grouting additive with water resistance, dispersion resistance and segregation resistance, and a preparation method and application thereof, and belongs to the technical field of grouting materials. The additive is prepared from the following raw materials in parts by mass: silica fume 30-50 parts, redispersible latex powder 16-24 parts, aluminum sulfate 20-30 parts, aluminate cement clinker 16-24 parts and retarder 1-2 parts. The five components, i.e. silica fume, redispersible latex powder, aluminum sulfate, aluminate cement clinker and retarder, are combined in a specific ratio, so that the functions of water resistance, dispersion resistance, segregation resistance, controllable rapid setting and micro-expansion are synergistically integrated under a low dosage.

Description

Technical Field

[0001] This invention relates to the field of grouting materials technology, and in particular to a grouting additive for water with anti-dispersion and anti-segregation properties, its preparation method, and its application. Background Technology

[0002] The information disclosed in the background section of this invention is intended only to enhance the understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Grouting technology is a key technique in engineering projects such as reinforcement of water-rich strata, repair of underwater structures, and control of tunnel water inrush. Traditional cement grouting faces three major challenges when used underwater or in dynamic water environments: First, the grout is easily diluted by water flow, resulting in significant loss of cement particles and low stone formation rate; second, the grout is prone to segregation and bleeding during static or pumping processes, causing uneven grouting and reduced stone strength; third, the setting time is difficult to balance the dual requirements of pumping construction and rapid water plugging. Existing quick-setting agents often set too quickly, leading to pipe blockage, while slow-setting grouts cannot quickly stop water flow.

[0004] To address these issues, various underwater anti-dispersion grouting materials have been developed in the industry. Existing technologies often employ thickeners such as cellulose ethers and polyacrylamide to improve grout cohesiveness; however, the dosage of these materials is typically high (10%–20%), and they significantly impact setting time, making precise control difficult. Other solutions attempt to balance pumpable time and early strength by incorporating a combination of rapid-setting and retarding components. However, these two types of components often exhibit antagonistic effects, resulting in a narrow formulation window, limited adjustment range, and anti-dispersion performance still dependent on high dosages.

[0005] Furthermore, existing grouting additives have relatively limited functions, often requiring the on-site mixing of multiple admixtures. This not only increases the complexity of construction but also leads to performance instability due to compatibility issues among the components. How to integrate multiple functions such as anti-dispersion, anti-segregation, controllable setting, and micro-expansion into a single additive under low-dosage conditions, while simultaneously ensuring grouting reliability in dynamic water environments, remains a pressing technical challenge in this field. Summary of the Invention

[0006] In view of this, the present invention provides a grouting additive for preventing dispersion and segregation in water, its preparation method and application.

[0007] In a first aspect, the present invention provides a grouting additive for preventing dispersion and segregation in water, made from the following raw materials in parts by weight: 30-50 parts silica fume, 16-24 parts redispersible latex powder, 20-30 parts aluminum sulfate, 16-24 parts aluminate cement clinker, and 1-2 parts retarder.

[0008] Preferably, it is made from the following parts by weight of raw materials: 35-45 parts silica fume, 18-22 parts redispersible latex powder, 22-28 parts aluminum sulfate, 18-22 parts aluminate cement clinker, and 1.2-1.8 parts retarder.

[0009] Preferably, the weight ratio of the retarder to the sum of aluminum sulfate and aluminate cement clinker is 1:25 to 1:40.

[0010] Preferably, the redispersible latex powder is one or more of ethylene-vinyl acetate copolymer, acrylate copolymer, or styrene-butadiene rubber.

[0011] Preferably, the retarder is tartaric acid or citric acid.

[0012] Preferably, the specific surface area of ​​the silica fume is ≥15 m². 2 / g, SiO2 content ≥85%.

[0013] Preferably, the aluminate cement clinker is graded CA-50 or CA-70 and has a fineness of ≤200 mesh.

[0014] Secondly, the present invention provides a method for preparing the above-mentioned anti-dispersion and anti-segregation grouting additive in water, comprising the following steps: The silica fume, redispersible latex powder, aluminum sulfate, aluminate cement clinker, and retarder are mixed evenly according to the mass ratio to obtain the final product.

[0015] Preferably, the ambient humidity is controlled to be below 60% during mixing, and the mixing time is 15 to 30 minutes.

[0016] Thirdly, the present invention provides the application of the above-mentioned anti-dispersion and anti-segregation grouting additive in water or the anti-dispersion and anti-segregation grouting additive in water prepared by the above-mentioned preparation method in formation cement grouting materials, wherein the additive accounts for 5% to 8% of the total mass of cementitious materials; Preferably, the cementing material is silicate cement; more preferably, the grouting additive can also be used in underwater concrete repair, shield wall backfilling grouting, or marine engineering grouting materials.

[0017] Compared with the prior art, the present invention has achieved the following beneficial effects: The anti-dispersion and anti-segregation grouting additive provided by this invention, through a specific ratio combination of five components—silica fume, redispersible latex powder, aluminum sulfate, aluminate cement clinker, and retarder—synergistically solves the technical problems of high dosage, poor anti-dispersion performance, uncontrollable setting time, and single function in existing technologies, while maintaining a total dosage of only 5% to 8% of the cementitious materials. Specifically: (1) Silica fume and redispersible latex powder work synergistically to achieve anti-dispersion and anti-segregation effects at low dosages. In this invention, silica fume, as an ultrafine active filler, has a particle size much smaller than cement particles, which can fill the micro-voids between cement particles, reduce the free water content of the slurry, and block the bleeding channels; redispersible latex powder forms a continuous polymer film after contact with water, which encapsulates cement particles and improves the cohesion of the slurry. The physical filling effect of silica fume and the chemical film-forming effect of redispersible latex powder form a synergistic reinforcement at the slurry-water interface: on the one hand, the filling of silica fume makes the internal structure of the slurry more compact, providing a stable substrate for the polymer film; on the other hand, the encapsulation effect of the polymer film firmly anchors the silica fume particles to the surface of cement particles, preventing them from being lost during scouring. The synergy of the two allows the slurry to form a dense protective film on the surface when it comes into contact with water flow, effectively resisting the dilution caused by water flow. Thus, excellent anti-dispersion and anti-segregation effects can be achieved with a total additive dosage of only 5%~8%.

[0018] (2) Aluminum sulfate and aluminate cement clinker synergistically achieve rapid setting and micro-expansion. Aluminum sulfate reacts with calcium hydroxide generated during cement hydration to rapidly generate ettringite crystals; aluminate cement clinker provides aluminate minerals. In the early stage of hydration, the two form a "dual supply" mechanism for ettringite formation: aluminum sulfate provides exogenous aluminum and sulfate ions, while aluminate cement clinker provides endogenous aluminate minerals. The synergy between the two enables ettringite crystals to precipitate rapidly and uniformly inside the slurry, quickly building a network structure, allowing the slurry to quickly establish early strength after injection to resist water erosion. At the same time, the formation of ettringite crystals is accompanied by volume expansion. This micro-expansion effect can compensate for the shrinkage during the hardening process of cement slurry, making the stone body tightly adhere to the interface of rock strata or structure, and improving the grout sealing performance.

[0019] (3) The retarder enables precise control of setting time. The retarder forms a stable complex with aluminum ions through the carboxyl groups in its molecular structure, precisely delaying the rate of aluminum ion release from the hydrolysis of aluminum sulfate and aluminate cement clinker, thereby inhibiting the premature and excessive formation of ettringite. This retarding mechanism forms a dynamic balance with the rapid setting mechanism: the retarder delays the initial release of aluminum ions, preventing the slurry from solidifying prematurely during pumping; and once the slurry is injected into place, the aluminum ions continuously released by aluminum sulfate and aluminate cement clinker will gradually break through the complexation balance of the retarder, initiating the rapid formation of ettringite. This dynamic balance mechanism of "retarding-rapid setting" extends the setting time from "a few minutes" of existing rapid setting agents to a controllable range of 20-40 minutes, while ensuring that strength can be quickly established after injection, solving the technical problem of the difficulty in balancing long-distance pumping and rapid water plugging.

[0020] (4) Five-component integration achieves functional integration and construction simplification. This invention integrates five functions—anti-dispersion, anti-segregation, rapid setting, retarding, and micro-expansion—into one additive. When used on-site, it only needs to be mixed with cement in proportion, eliminating the need for compounding multiple admixtures, avoiding compatibility issues between different admixtures, simplifying the construction process, and reducing the risk of on-site operational errors. Detailed Implementation

[0021] 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 herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] This invention provides a grouting additive for preventing dispersion and segregation in water, made from the following raw materials in parts by weight: 30-50 parts silica fume, 16-24 parts redispersible latex powder, 20-30 parts aluminum sulfate, 16-24 parts aluminate cement clinker, and 1-2 parts retarder.

[0024] Specifically, this invention achieves a synergistic integration of multiple functions, including anti-dispersion, anti-segregation, rapid setting, and micro-expansion, at low dosages, through a specific ratio combination of five components: silica fume, redispersible latex powder, aluminum sulfate, aluminate cement clinker, and a retarder. Within this ratio range, silica fume and redispersible latex powder synergistically achieve anti-dispersion and anti-segregation, aluminum sulfate and aluminate cement clinker synergistically achieve rapid setting and micro-expansion, and the retarder enables precise control of setting time. The combined effect of the five components allows for excellent underwater grouting performance even when the total additive dosage is only 5% to 8% of the cementitious material dosage. Through extensive testing, the inventors discovered that when the silica fume dosage exceeds 30-50 parts (e.g., more than 50 parts), the grout viscosity becomes too high, leading to pumping difficulties; when the silica fume dosage is less than 30 parts, the filling effect is insufficient, and the bleeding rate increases significantly.

[0025] In an optional embodiment of the present invention, it is made from the following parts by weight of raw materials: 35-45 parts silica fume, 18-22 parts redispersible latex powder, 22-28 parts aluminum sulfate, 18-22 parts aluminate cement clinker, and 1.2-1.8 parts retarder.

[0026] In an optional embodiment of the present invention, the weight ratio of the retarder to the sum of aluminum sulfate and aluminate cement clinker is 1:25 to 1:40.

[0027] Specifically, by adjusting the weight ratio of tartaric acid to aluminum sulfate and aluminate cement clinker, the initial setting time can be precisely adjusted within the range of 20 to 40 minutes. Within this ratio range, an initial setting time of 30 minutes ± 5 minutes can be achieved, while simultaneously meeting the dual requirements of pumpability and rapid water shut-off.

[0028] In an optional embodiment of the present invention, the redispersible latex powder is one or more of ethylene-vinyl acetate copolymer, acrylate copolymer, or styrene-butadiene rubber.

[0029] Specifically, all three types of latex powders mentioned above exhibit good redispersibility and film-forming ability in water. Upon contact with water, they can rapidly form a continuous polymer film, effectively encapsulating cement particles and enhancing the cohesion of the slurry. Among them, ethylene-vinyl acetate copolymer latex powder possesses excellent flexibility and bonding strength, acrylate copolymer latex powder exhibits outstanding water resistance and weather resistance, and styrene-butadiene rubber latex powder possesses high elasticity and impact resistance. They can be selected or compounded according to specific engineering requirements.

[0030] In an optional embodiment of the present invention, the retarder is tartaric acid or citric acid.

[0031] Specifically, tartaric acid and citric acid are both hydroxycarboxylic acid retarder. The carboxyl and hydroxyl groups in their molecular structures can form stable five- or six-membered ring complexes with aluminum ions, effectively delaying the formation rate of ettringite. Compared to ordinary retarder, these retarders have less interference with the cement hydration process, good compatibility with aluminum sulfate and aluminate cement clinker, and can achieve wide-range, high-precision control of setting time without adversely affecting the later strength of the cementitious aggregate.

[0032] In an optional embodiment of the present invention, the specific surface area of ​​the silica fume is ≥15 m². 2 / g, SiO2 content ≥85%.

[0033] Specifically, silica fume with a high specific surface area exhibits a stronger micro-aggregate filling effect, enabling it to more fully fill the fine voids between cement particles and significantly reduce the bleeding rate of the paste. The high SiO2 content ensures the pozzolanic activity of the silica fume, allowing it to react with calcium hydroxide generated during cement hydration to form additional CSH gel, improving the density and later-stage strength of the aggregate. When the specific surface area or SiO2 content of silica fume is below the above limits, its filling effect and pozzolanic activity both decrease significantly, making it difficult to achieve excellent anti-dispersion and anti-segregation effects under low-dosage conditions.

[0034] In an optional embodiment of the present invention, the aluminate cement clinker is designated as CA-50 or CA-70 and has a fineness of ≤200 mesh.

[0035] Specifically, aluminate cement clinker with a fineness ≤200 mesh has a higher specific surface area and reactivity, enabling it to rapidly release aluminate minerals in the early stages of hydration. This synergistic effect with aluminum sulfate promotes the rapid formation of ettringite, ensuring the slurry establishes early strength promptly after injection and resists water erosion. If the aluminate cement clinker is too coarse, its hydration reaction rate decreases, its rapid-setting effect weakens, and it becomes difficult to form an effective rapid-setting synergy with aluminum sulfate.

[0036] This invention provides a method for preparing the above-mentioned anti-dispersion and anti-segregation grouting additive in water, comprising the following steps: The silica fume, redispersible latex powder, aluminum sulfate, aluminate cement clinker, and retarder are mixed evenly according to the mass ratio to obtain the final product.

[0037] Specifically, silica fume, redispersible latex powder, aluminum sulfate, aluminate cement clinker, and retarder are mixed evenly according to their mass proportions. This method uses physical mixing, which is simple and easy to operate. It does not require complex chemical reactions or special equipment and is suitable for industrial mass production.

[0038] In an optional embodiment of the present invention, the ambient humidity is controlled to be below 60% during mixing, and the mixing time is 15 to 30 minutes.

[0039] Specifically, controlling ambient humidity can effectively prevent components such as silica fume and redispersible latex powder from clumping due to moisture absorption, ensuring uniform mixing. A mixing time of less than 15 minutes may result in insufficient dispersion of the components, while a mixing time of more than 30 minutes may increase energy consumption with limited improvement in mixing effect. A mixing time of 15 to 30 minutes ensures sufficient dispersion of the components.

[0040] This invention provides the application of the above-mentioned anti-dispersion and anti-segregation grouting additive in water or the anti-dispersion and anti-segregation grouting additive prepared by the above-mentioned preparation method in formation cement grouting materials, wherein the additive accounts for 5% to 8% of the total mass of the cementitious material; In an optional embodiment of the present invention, the cementing material is silicate cement.

[0041] The technical solution of the present invention will be further described below with reference to specific embodiments. The present invention does not impose any special restrictions on the source of reagents used in the following embodiments; commercially available products well known to those skilled in the art can be used.

[0042] Example 1 This embodiment provides an anti-dispersion and anti-segregation grouting additive for water, which is made from the following raw materials in parts by weight: 30 parts silica fume, 16 parts ethylene-vinyl acetate copolymer, 20 parts aluminum sulfate, 16 parts aluminate cement clinker with CA-50 designation, and 1 part tartaric acid.

[0043] Preparation method: Control the ambient humidity to 55%, put the above raw materials into a mixer and stir for 15 minutes until the components are evenly dispersed to obtain the additive.

[0044] Example 2 This embodiment provides an anti-dispersion and anti-segregation grouting additive for water, which is made from the following raw materials in parts by weight: 40 parts silica fume, 20 parts acrylate copolymer, 25 parts aluminum sulfate, 20 parts aluminate cement clinker with the designation CA-50, and 1.5 parts tartaric acid.

[0045] Preparation method: Control the ambient humidity to 50%, put the above raw materials into a mixer and stir for 20 minutes until the components are evenly dispersed to obtain the additive.

[0046] Example 3 This embodiment provides an anti-dispersion and anti-segregation grouting additive for water, which is made from the following raw materials in parts by weight: 50 parts silica fume, 24 parts styrene-butadiene rubber, 30 parts aluminum sulfate, 24 parts aluminate cement clinker with the grade CA-50, and 2 parts citric acid.

[0047] Preparation method: Control the ambient humidity to 45%, put the above raw materials into a mixer and stir for 30 minutes until the components are evenly dispersed to obtain the additive.

[0048] Comparative Example 1 This comparative example provides a grouting additive, which differs from Example 2 in that it does not contain acrylate copolymer, but the other methods are the same as in Example 2.

[0049] Comparative Example 2 This comparative example provides a grouting additive, which differs from Example 2 in that it does not contain silica fume, but the other methods are the same as in Example 2.

[0050] Comparative Example 3 This comparative example provides a grouting additive, which differs from Example 2 in that it does not contain silica fume and acrylate copolymer, but the other methods are the same as in Example 2.

[0051] Comparative Example 4 This comparative example provides a grouting additive, which differs from Example 2 in that aluminum sulfate is not added, while the other methods are the same as in Example 2.

[0052] Comparative Example 5 This comparative example provides a grouting additive, which differs from Example 2 in that it does not add aluminate cement clinker labeled CA-50, while the other methods are the same as in Example 2.

[0053] Comparative Example 6 This comparative example provides a grouting additive, which differs from Example 2 in that it does not contain aluminum sulfate or aluminate cement clinker labeled CA-50, while the other methods are the same as in Example 2.

[0054] Comparative Example 7 This comparative example provides a grouting additive, which differs from Example 2 in that tartaric acid is not added, while the other methods are the same as in Example 2.

[0055] Application performance testing The additives obtained in Examples 1-3 and Comparative Examples 1-7 were mixed with silicate cement, with the additive dosage being 6.5% of the silicate cement mass. Mixing water was added at a water-cement ratio of 0.5:1, and the mixture was stirred until homogeneous to prepare cement grouting material. The grouting material was molded into the required specimens and cured under standard curing conditions to the specified age. Performance tests were then conducted, and the test results are shown in Tables 1 and 2.

[0056] The test methods for aggregate rate and cement particle loss rate were conducted in accordance with the current standard "Test Procedure for Underwater Non-Dispersible Concrete" (DL / T 5117); the test method for bleeding rate was conducted in accordance with the current standard "Standard for Test Methods of Performance of Ordinary Concrete Mixtures" (GB / T 50080); the test method for initial setting time was conducted in accordance with the current standard "Test Methods for Standard Consistency Water Requirement, Setting Time and Soundness of Cement" (GB / T 1346); and the test method for 28-day impermeability pressure was conducted in accordance with the current standard "Cement-based Penetrating Crystalline Waterproofing Materials" (GB 18445). Following the basic principles of anti-dispersion in "Test Procedure for Underwater Non-Dispersible Concrete" (DL / T5117) and based on the commonly used dynamic water simulation method in this field (see relevant research in the "Chinese Journal of Geotechnical Engineering"), a self-made dynamic water flushing device was used for testing. This device controlled the water flow velocity in the water tank (2000mm×300mm×300mm) using a variable frequency water pump to determine the anti-dispersion performance in a dynamic water environment.

[0057] Meanwhile, referring to the "Technical Specification for Application of Cement-based Grouting Materials" (GB / T 50448-2015), the free expansion rate of the grouting material was determined using the length ratio method.

[0058] Table 1 Comparison of performance parameters between each embodiment and the corresponding comparative example.

[0059] Table 2. Test results of slurry micro-expansion performance in Examples 1-3 and Comparative Examples 4-5

[0060] Test results show that, under the low additive dosage of only 6.5%, Examples 1-3 all achieved good anti-dispersion performance in water (stone rate ≥91.5%, cement particle loss rate ≤9.6%), low bleeding rate (≤2.8%), controllable setting time (23-35 minutes), and 28-day impermeability pressure ≥1.2 MPa. In dynamic water conditions, Examples 1-3 exhibited a dynamic water retention rate of 86.2%-88.9% at a flow rate of 0.5 m / s and 79.5%-83.6% at a flow rate of 1.0 m / s, indicating that the invention maintains excellent erosion resistance under dynamic water flow conditions. Micro-expansion performance tests (Table 2) show that the 24-hour free expansion rate of Examples 1-3 was 0.10%-0.15%, and the 28-day free expansion rate was 0.17%-0.22%. Expansion mainly occurred in the first 3 days and tended to stabilize in the later stages, effectively compensating for the hardening shrinkage of the cement paste.

[0061] Comparative Examples 1-3, lacking redispersible latex powder, silica fume, or both, showed a significant decrease in aggregate rate (75.6%-85.1%), a substantial increase in cement particle loss rate (15.9%-25.5%), a marked increase in bleeding rate (4.8%-7.3%), and a significant decrease in dynamic water retention rate (only 55.8%-68.9% at 1.0 m / s). This indicates that the synergistic effect of silica fume and redispersible latex powder is crucial for achieving excellent anti-dispersion and anti-segregation performance at low dosages.

[0062] Comparative Examples 4-6 lacked aluminum sulfate, aluminate cement clinker, or both, resulting in significantly prolonged initial setting times of 56-76 minutes. This failed to meet the requirements of rapid water-blocking projects, which typically require an initial setting time of ≤45 minutes. The 28-day impermeability pressure decreased (0.9-1.1 MPa), and the dynamic water retention rate was also affected (74.5%-77.3% under 1.0 m / s conditions). Furthermore, Table 2 shows that the free expansion rates of Comparative Examples 4-6 were only 0.00%-0.05%, indicating virtually no expansion effect. Comparative Example 6 (lacking both) had a free expansion rate close to zero (0.00%-0.01%). These results demonstrate that the synergistic effect of aluminum sulfate and aluminate cement clinker is crucial for achieving rapid setting, early strength development, and a micro-expansion effect; both are indispensable.

[0063] Comparative Example 7 lacked a retarder, resulting in a drastic reduction in its initial setting time to 5 minutes, which could not meet the requirements for pumping construction. In contrast, the Example 1 effectively controlled the initial setting time within the pumpable range of 23 to 35 minutes through precise control of the retarder, without affecting the final impermeability of the stone body or the anti-dispersion performance of the flowing water.

[0064] In summary, this invention achieves a multi-functional integration of anti-dispersion, anti-segregation, rapid setting, slowing and control, and micro-expansion through a specific ratio combination of five components: silica fume, redispersible latex powder, aluminum sulfate, aluminate cement clinker, and retarder, under low dosage conditions. It also has excellent adaptability to dynamic water environments. Each component is indispensable, resulting in good technical effects.

[0065] 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 grouting additive for water-based anti-dispersion and anti-segregation, characterized in that, Made from the following parts by weight of raw materials: 30-50 parts silica fume, 16-24 parts redispersible latex powder, 20-30 parts aluminum sulfate, 16-24 parts aluminate cement clinker, and 1-2 parts retarder.

2. The grouting additive for anti-dispersion and anti-segregation in water as described in claim 1, characterized in that, Made from the following parts by weight of raw materials: 35-45 parts silica fume, 18-22 parts redispersible latex powder, 22-28 parts aluminum sulfate, 18-22 parts aluminate cement clinker, and 1.2-1.8 parts retarder.

3. The grouting additive for anti-dispersion and anti-segregation in water as described in claim 1, characterized in that, The weight ratio of the retarder to the sum of aluminum sulfate and aluminate cement clinker is 1:25 to 1:

40.

4. The grouting additive for anti-dispersion and anti-segregation in water as described in claim 1, characterized in that, The redispersible latex powder is one or more of ethylene-vinyl acetate copolymer, acrylate copolymer, or styrene-butadiene rubber.

5. The grouting additive for anti-dispersion and anti-segregation in water as described in claim 1, characterized in that, The retarder is tartaric acid or citric acid.

6. The grouting additive for anti-dispersion and anti-segregation in water as described in claim 1, characterized in that, The specific surface area of ​​the silica fume is ≥15 m². 2 / g, SiO2 content ≥85%.

7. The grouting additive for anti-dispersion and anti-segregation in water as described in claim 1, characterized in that, The aluminate cement clinker is designated as CA-50 or CA-70, with a fineness of ≤200 mesh.

8. The method for preparing the water-based anti-dispersion and anti-segregation grouting additive according to any one of claims 1 to 7, characterized in that, Includes the following steps: The silica fume, redispersible latex powder, aluminum sulfate, aluminate cement clinker, and retarder are mixed evenly according to the mass ratio to obtain the final product.

9. The preparation method according to claim 8, characterized in that, Mix when the ambient humidity is below 60% for 15-30 minutes.

10. The application of the water-based anti-dispersion and anti-segregation grouting additive as described in any one of claims 1 to 7, or the water-based anti-dispersion and anti-segregation grouting additive prepared by the preparation method described in any one of claims 8 to 9, in formation cement grouting materials, characterized in that, The additives account for 5% to 8% of the total mass of the cementitious material; Preferably, the cementing material is silicate cement; more preferably, the grouting additive can also be used in underwater concrete repair, shield wall backfilling grouting, or marine engineering grouting materials.

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