Double-liquid grouting material for roadbed settlement improvement and preparation method of double-liquid grouting material

Abstract

The invention discloses a double-liquid grouting material for roadbed settlement improvement and a preparation method thereof, and relates to the technical field of road engineering. The double-liquid grouting material comprises a component material A and a component material B, the component material A comprises the following components in parts by weight: 55-70 parts of cement, 15-30 parts of mineral powder, 10-20 parts of stone powder, 0.2-1.5 parts of a water reducing agent, 0.1-1 part of an expanding agent and 0-4 parts of a composite regulator; the composite regulator comprises the following components: borax, sodium phosphate and sodium citrate; and the component material B comprises the following components in parts by weight: 99-99.99 parts of a water glass solution and 0.01-1 part of a stabilizer. The double-liquid grouting material for roadbed settlement improvement has high compressive strength, the adjusting range of the setting time is wide, and the adjusting range can be controlled according to the site construction environment requirement.

Description

Technical Field

[0001] This invention relates to the field of road engineering technology, and in particular to a two-component grouting material for roadbed settlement treatment and its preparation method. Background Technology

[0002] As a core component of transportation infrastructure, the operational safety and durability of highways directly affect regional traffic flow and public safety. During long-term operation, roadbed settlement becomes a typical and serious problem due to the combined effects of multiple factors, including geological conditions, cumulative traffic loads, and changes in the hydrological environment. Roadbed settlement directly leads to reduced pavement smoothness and vehicle bouncing, and in severe cases, it can cause pavement cracking, structural layer delamination, or even complete destruction. This not only significantly shortens the road's lifespan and reduces traffic capacity but also creates major traffic safety hazards, resulting in substantial economic losses and social impacts on the transportation industry.

[0003] To effectively address subgrade settlement, restore its bearing capacity, and ensure normal road operation, grouting is a commonly used method in the industry. Grouting technology involves injecting grout into loose areas or pores in the subgrade. The grout, after setting, fills the voids and binds the particles, thereby improving the overall density and bearing capacity of the subgrade and achieving settlement control and reinforcement repair. Among various grouting techniques, two-component grouting technology is widely used for rapid subgrade reinforcement and repair due to its rapid setting speed and high early strength.

[0004] Traditional two-component grouting materials are mainly made of water glass and cement slurry. While these materials have the advantage of fast setting time, their compressive strength is often low, making it difficult to meet the requirements for highway subgrade settlement control. Some two-component grouting materials specifically designed for highway subgrade settlement control, such as the early-strength flexible two-component grouting material for highway subgrade repair (publication number CN105060829B), have higher compressive strength, but their setting time adjustment range is limited. This makes it difficult to control the setting time according to actual construction conditions. When a longer construction period is required, the inability to significantly extend the setting time can easily lead to premature grout setting, causing blockage of the grouting pipeline. It may also result in poor grout workability, uneven subgrade reinforcement, and consequently affect the long-term reliability of settlement control. Furthermore, the setting time of these two-component grouting materials is often inversely proportional to the later (7-28 days) compressive strength; extending the setting time will lead to a decrease in the later (7-28 days) compressive strength. Therefore, there is an urgent practical need to develop a new type of two-component grouting material that can adjust the setting time over a wide range and has high compressive strength, in order to improve the technical level of highway subgrade settlement control.

[0005] Forming the content of the invention The technical problem to be solved by the present invention is to provide a two-component grouting material for roadbed settlement treatment, which not only has high compressive strength but also a wide range of adjustable setting time, which can be controlled according to the requirements of the on-site construction environment.

[0006] The technical problem to be solved by the present invention is to provide a method for preparing a two-component grouting material for roadbed settlement treatment, which is used to prepare the above-mentioned two-component grouting material for roadbed settlement treatment. The prepared two-component grouting material has high compressive strength and a wide range of adjustable setting time.

[0007] To address the aforementioned technical problems, this invention provides a two-component grouting material for roadbed settlement control, comprising component A and component B. The A component material comprises the following components in parts by weight: 55-70 parts cement, 15-30 parts mineral powder, 10-20 parts stone powder, 0.2-1.5 parts water-reducing agent, 0.1-1 parts expansion agent, and 0-4 parts composite regulator; wherein the composite regulator comprises borax, sodium phosphate, and sodium citrate. The B component material comprises the following components in parts by weight: 99-99.99 parts of water glass solution and 0.01-1 parts of stabilizer.

[0008] As an improvement to the above technical solution, the weight ratio of borax to sodium citrate in the composite regulator is 2.5:2 to 3.5:2, and the weight ratio of sodium phosphate to sodium citrate is 4.5:2 to 5.5:2.

[0009] As an improvement to the above technical solution, the weight ratio of borax, sodium phosphate and sodium citrate in the composite regulator is 3:5:2.

[0010] As an improvement to the above technical solution, the strength grade of the cement is ≥42.5, and the 28-day activity index of the mineral powder is ≥95%.

[0011] As an improvement to the above technical solution, the modulus of the water glass solution is 2.5~3.5 and the concentration is 20~35°Bé.

[0012] As an improvement to the above technical solution, the fineness of the stone powder is 120~200 mesh.

[0013] As an improvement to the above technical solution, the water-reducing agent is one or more of aliphatic water-reducing agents, polycarboxylate water-reducing agents, and sulfonate water-reducing agents.

[0014] As an improvement to the above technical solution, the stabilizer is a cellulose ether stabilizer.

[0015] As an improvement to the above technical solution, the expanding agent is one or more of sulfoaluminate expanding agents, aluminate expanding agents, and calcium oxide expanding agents.

[0016] Accordingly, the present invention also provides a method for preparing a two-component grouting material for roadbed settlement control, which includes the following steps: (1) Weigh cement, mineral powder, stone powder, water-reducing agent, expansion agent and composite regulator according to the formula, mix the weighed materials evenly according to the formula to obtain component A material; add water and mix with component A material according to the water-material ratio of 0.35~0.6 to obtain component A slurry; (2) Weigh the water glass solution and stabilizer according to the formula, and then fully dissolve the stabilizer in the water glass solution to obtain component B material; (3) Mix component A slurry and component B material evenly to obtain a two-component grouting material for roadbed settlement treatment.

[0017] As an improvement to the above technical solution, in step (3), the A component slurry and the B component material are mixed evenly according to the mass ratio of A component slurry to B component material of 1:0.5 to 1:1.2 to obtain the two-liquid grouting material for roadbed settlement treatment.

[0018] Implementing this invention has the following beneficial effects: 1. This invention incorporates mineral powder and stone powder into the formulation of component A. Mineral powder exhibits both pozzolanic and micro-aggregate effects, while stone powder provides micro-aggregate support. The addition of both helps improve the strength of the grout. Simultaneously, the introduction of an expansion agent into component A helps reduce shrinkage, resulting in a better filling effect. Furthermore, the introduction of a composite regulator into component A allows for adjustment of the setting time according to on-site construction conditions, making the gel time of the two-component grouting material controllable within the range of 15s to 30min. Component B incorporates a stabilizer to ensure the homogeneity of the water glass solution and prevent stratification over time. Through the synergistic effect of the components in the two-component grouting material, a two-component grouting material for roadbed settlement control can be obtained, exhibiting excellent mechanical properties, controllable and wide-range setting time, and a direct correlation between setting time and compressive strength.

[0019] 2. The composite regulator in this invention is prepared by compounding materials such as borax, sodium phosphate and sodium citrate. The composite regulator composed of these specific materials can not only controllably adjust the gel time of the two-component grouting material for roadbed settlement control, but also improve the micro-expansion effect of the grout, thereby increasing the strength in the later stage (7d~28d). As a result, the gel time and later strength of the two-component grouting material in this invention are directly proportional. Therefore, this invention can enhance the later strength of the two-component grouting material while extending the gel time, overcoming the defect that the compressive strength of the existing two-component grouting material decreases when the setting time is extended. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. This invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this invention.

[0021] Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or in accordance with the product instructions. Raw materials whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0022] This embodiment discloses a two-component grouting material for roadbed settlement treatment, comprising component A and component B; The A component material comprises the following components by weight: 55-70 parts cement, 15-30 parts mineral powder, 10-20 parts stone powder, 0.2-1.5 parts water-reducing agent, 0.1-1 parts expansion agent, and 0-4 parts composite regulator, the sum of the weight of the above components being 100 parts; wherein the composite regulator comprises borax, sodium phosphate, and sodium citrate. The B component material comprises the following components in parts by weight: 99-99.99 parts of water glass solution and 0.01-1 parts of stabilizer, the sum of the weight parts of the water glass solution and stabilizer being 100 parts.

[0023] It is worth noting that this embodiment incorporates mineral powder and stone powder into the A component material formulation. Mineral powder exhibits both pozzolanic and micro-aggregate effects, while stone powder provides micro-aggregate support. The inclusion of both helps improve the grout strength. Simultaneously, the introduction of an expansion agent into the A component material helps reduce shrinkage, resulting in a better filling effect. Furthermore, the introduction of a composite regulator into the A component material allows for adjustment of the setting time according to on-site construction conditions, making the gel time of the two-component grouting material controllable within the range of 15s to 30min. The B component material incorporates a stabilizer to ensure the homogeneity of the water glass solution and prevent stratification over time. Through the synergistic effect of the components in the two-component grouting material, a two-component grouting material for roadbed settlement control can be obtained, exhibiting excellent mechanical properties, controllable and wide-range setting time, and a direct correlation between setting time and compressive strength.

[0024] Specifically, cement is the main component responsible for the strength of the two-component grouting material. Cement undergoes a hydration reaction upon contact with water, forming hydrated calcium silicate gel (CSH) and hydration products such as calcium hydroxide, which possess stable bonding properties and impart mechanical strength to the two-component grouting material. In some embodiments, the cement has a strength grade ≥42.5, which is beneficial for improving the strength of the grout. Specifically, P·O 42.5 cement, P·O 52.5 cement, and P·O 42.5R cement can be used, but are not limited to these. Specifically, in the formulation of component A, the amount of cement is 55-70 parts, exemplarily 55 parts, 58 parts, 60 parts, 64 parts, 68 parts, or 70 parts, but not limited to these.

[0025] To further explain, the incorporation of mineral powder can create a pozzolanic effect and a micro-aggregate filling effect, which is beneficial for further improving the strength and impermeability of the two-component grouting material. Furthermore, the particle shape of mineral powder is smoother and finer than that of cement particles, which can improve fluidity and enhance construction performance. Specifically, the amount of mineral powder in component A is 15-30 parts, with examples of 15, 18, 21, 24, 27, or 30 parts, but not limited to these.

[0026] In some embodiments, the 28-day activity index of the mineral powder is ≥95%. The mineral powder can undergo a secondary hydration reaction with calcium hydroxide produced during cement hydration to generate stable hydration products such as CSH gel and ettringite, which supplements and optimizes the hydration product structure of the two-component grouting material, significantly improving the mechanical strength, density, and durability of the hardened grout. Compared with low-activity mineral powders such as S75 and S80, the S95 grade mineral powder used in this embodiment has higher reactivity and a more significant strength contribution, which can effectively reduce cement usage and optimize the workability of the grout.

[0027] To further explain, the incorporation of stone powder mainly serves as a micro-aggregate filling effect, further improving the slurry strength. Specifically, in the formulation of component A, the amount of stone powder is 10-20 parts, which is beneficial for improving the slurry strength. Exemplary examples are 10, 12, 14, 16, 18, or 20 parts, but are not limited to these. In some embodiments, the fineness of the stone powder is 120-200 mesh, and using stone powder within this fineness range is beneficial for further improving the slurry strength.

[0028] To further explain, the incorporation of a water-reducing agent in component A can reduce the amount of water used and improve the fluidity of the slurry. The amount of water-reducing agent in component A is 0.2 to 1.5 parts, with examples of 0.2, 0.4, 0.7, 1.0, 1.2, or 1.5 parts, but not limited thereto. In some embodiments, the water-reducing agent is one or more of aliphatic water-reducing agents, polycarboxylate water-reducing agents, and sulfonate water-reducing agents, but not limited thereto.

[0029] To further explain, the incorporation of an expanding agent in component A can reduce slurry shrinkage, prevent the filling effect from being affected by slurry shrinkage, and further improve compressive strength. Specifically, in the formulation of component A, the amount of expanding agent is 0.1 to 1 part, exemplarily 0.1, 0.2, 0.4, 0.6, 0.8, or 1 part, but not limited to these. In some embodiments, the expanding agent may be one or more of sulfoaluminate expanding agents, aluminate expanding agents, and calcium oxide expanding agents, but is not limited to these.

[0030] To further explain, the introduction of the composite modifier allows the gel time of the two-component grouting material to be controllable within the range of 15s to 30min. In this embodiment, as the dosage of the composite modifier increases, the setting time of the two-component grouting material is prolonged. Therefore, the setting time can be controlled by adjusting the dosage of the composite modifier, allowing the setting time to be controlled according to the requirements of the site environment. Specifically, the dosage of the composite modifier in component A is 0 to 4 parts, exemplarily 0 parts, 0.5 parts, 1.0 parts, 2.0 parts, or 3.0 parts, but not limited to these.

[0031] It is worth noting that the composite regulator in this embodiment is prepared by compounding materials such as borax, sodium phosphate and sodium citrate. The composite regulator composed of these specific materials can not only controllably adjust the gel time of the two-component grouting material for roadbed settlement control, but also improve the micro-expansion effect of the grout, thereby increasing the strength in the later stage (7d~28d). As a result, the gel time and later strength of the two-component grouting material in this invention are directly proportional. Therefore, this invention can enhance the later strength of the two-component grouting material while extending its gel time, overcoming the defect that the compressive strength of existing two-component grouting materials decreases when the setting time is extended.

[0032] In one embodiment, the weight ratio of borax to sodium citrate in the composite regulator is 2.5:2 to 3.5:2, and the weight ratio of sodium phosphate to sodium citrate is 4.5:2 to 5.5:2. The weight ratio of borax, sodium phosphate, and sodium citrate within the above range is beneficial for controllably adjusting the gel time of the two-component grouting material used for roadbed settlement control and improving the micro-expansion effect of the grout, thereby enhancing the later-stage strength of the grout. More preferably, the weight ratio of borax, sodium phosphate, and sodium citrate in the composite regulator is 3:5:2.

[0033] Further explanation: The water glass solution reacts rapidly with the calcium hydroxide in component A slurry to form CSH gel, which exhibits strong flocculation. Therefore, without the addition of a composite regulator, the mixing of water glass solution and component A slurry will result in accelerated coagulation, with a setting time generally <20 seconds. In some embodiments, the modulus of the water glass solution is 2.5~3.5, and the concentration is 20~35°Bé (Beaumesh). The incorporation of a stabilizer in component B formulation prevents the water glass solution from separating upon prolonged storage, ensuring the homogeneity of the water glass solution. In some embodiments, cellulose ether stabilizers can be used.

[0034] Accordingly, this embodiment also discloses a method for preparing a two-component grouting material for roadbed settlement control, which includes the following steps: (1) Weigh cement, mineral powder, stone powder, water-reducing agent, expansion agent and composite regulator according to the formula, mix the weighed materials evenly according to the formula to obtain component A material; add water and mix with component A material according to the water-material ratio of 0.35~0.6 to obtain component A slurry; specifically, the water-material ratio of component A slurry is controlled in the range of 0.35~0.6, which is beneficial to improve the strength and construction performance of the two-liquid grouting material; (2) Weigh the water glass solution and stabilizer according to the formula, and then fully dissolve the stabilizer in the water glass solution to obtain component B material; (3) Mix component A slurry and component B material evenly to obtain a two-component grouting material for roadbed settlement treatment.

[0035] In some embodiments, in step (3), the A component slurry and the B component material are mixed evenly according to a mass ratio of 1:0.5 to 1:1.2 to obtain a two-component grouting material for roadbed settlement treatment.

[0036] The technical solution of the present invention will be further described below through embodiments and comparative examples.

[0037] Example 1 This embodiment provides a two-component grouting material for roadbed settlement treatment, comprising component A and component B; The A component material includes the following components by weight: 63.3 parts of P·O 42.5R cement, 22 parts of S95 grade mineral powder, 13 parts of 120~200 mesh stone powder, 1.0 part of polycarboxylate superplasticizer, 0.7 parts of sulfoaluminate expansive agent and 0 parts of composite regulator. Component B comprises the following components in parts by weight: 99.96 parts of water glass solution and 0.04 parts of stabilizer, wherein the modulus of the water glass solution is 2.8 and the concentration is 30°Bé, and the stabilizer is a vitamin ether stabilizer.

[0038] The preparation method of the two-component grouting material for roadbed settlement treatment in this embodiment includes the following steps: (1) Weigh each raw material according to the formula of component A, mix each raw material thoroughly and evenly, add water and stir at a water-to-material ratio of 0.45 to form component A slurry; (2) Weigh the water glass solution and stabilizer according to the formula of component B material, and fully dissolve the stabilizer in the water glass solution to form component B slurry; (3) Weigh out component A grout and component B grout in a mass ratio of 1:0.8 and mix them to form a two-component grouting material for roadbed settlement treatment.

[0039] Example 2 This embodiment provides a two-component grouting material for roadbed settlement treatment, comprising component A and component B; The A component material includes the following components by weight: 63 parts of P·O 42.5R cement, 22 parts of S95 grade mineral powder, 13 parts of 120~200 mesh stone powder, 1.0 part of polycarboxylate superplasticizer, 0.7 parts of sulfoaluminate expansive agent and 0.3 parts of composite regulator. Component B comprises the following components in parts by weight: 99.96 parts of water glass solution and 0.04 parts of stabilizer, wherein the modulus of the water glass solution is 2.8 and the concentration is 30°Bé, and the stabilizer is a vitamin ether stabilizer.

[0040] The preparation method of the two-component grouting material for roadbed settlement treatment in this embodiment includes the following steps: (1) Weigh each raw material according to the formula of component A, mix each raw material thoroughly and evenly, add water and stir at a water-to-material ratio of 0.45 to form component A slurry; (2) Weigh the water glass solution and stabilizer according to the formula of component B material, and fully dissolve the stabilizer in the water glass solution to form component B slurry; (3) Weigh out component A grout and component B grout in a mass ratio of 1:0.8 and mix them to form a two-component grouting material for roadbed settlement treatment.

[0041] Example 3 This embodiment provides a two-component grouting material for roadbed settlement treatment, comprising component A and component B; The A component material includes the following components by weight: 62.8 parts of P·O 42.5R cement, 22 parts of S95 grade mineral powder, 13 parts of 120~200 mesh stone powder, 1.0 part of polycarboxylate superplasticizer, 0.7 parts of sulfoaluminate expansive agent and 0.5 parts of composite regulator. Component B comprises the following components in parts by weight: 99.96 parts of water glass solution and 0.04 parts of stabilizer, wherein the modulus of the water glass solution is 2.8 and the concentration is 30°Bé, and the stabilizer is a vitamin ether stabilizer.

[0042] The preparation method of the two-component grouting material for roadbed settlement treatment in this embodiment includes the following steps: (1) Weigh each raw material according to the formula of component A, mix each raw material thoroughly and evenly, add water and stir at a water-to-material ratio of 0.45 to form component A slurry; (2) Weigh the water glass solution and stabilizer according to the formula of component B material, and fully dissolve the stabilizer in the water glass solution to form component B slurry; (3) Weigh out component A grout and component B grout in a mass ratio of 1:0.8 and mix them to form a two-component grouting material for roadbed settlement treatment.

[0043] Example 4 This embodiment provides a two-component grouting material for roadbed settlement treatment, comprising component A and component B; The A component material includes the following components by weight: 62.3 parts of P·O 42.5R cement, 22 parts of S95 grade mineral powder, 13 parts of 120~200 mesh stone powder, 1.0 part of polycarboxylate superplasticizer, 0.7 parts of sulfoaluminate expansive agent and 1.0 part of composite regulator. Component B comprises the following components in parts by weight: 99.96 parts of water glass solution and 0.04 parts of stabilizer, wherein the modulus of the water glass solution is 2.8 and the concentration is 30°Bé, and the stabilizer is a vitamin ether stabilizer.

[0044] The preparation method of the two-component grouting material for roadbed settlement treatment in this embodiment includes the following steps: (1) Weigh each raw material according to the formula of component A, mix each raw material thoroughly and evenly, add water and stir at a water-to-material ratio of 0.45 to form component A slurry; (2) Weigh the water glass solution and stabilizer according to the formula of component B material, and fully dissolve the stabilizer in the water glass solution to form component B slurry; (3) Weigh out component A grout and component B grout in a mass ratio of 1:0.8 and mix them to form a two-component grouting material for roadbed settlement treatment.

[0045] Example 5 This embodiment provides a two-component grouting material for roadbed settlement treatment, comprising component A and component B; The A component material includes the following components by weight: 61.8 parts of P·O 42.5R cement, 22 parts of S95 grade mineral powder, 13 parts of 120~200 mesh stone powder, 1.0 part of polycarboxylate superplasticizer, 0.7 parts of sulfoaluminate expansive agent and 1.5 parts of composite regulator. Component B comprises the following components in parts by weight: 99.96 parts of water glass solution and 0.04 parts of stabilizer, wherein the modulus of the water glass solution is 2.8 and the concentration is 30°Bé, and the stabilizer is a vitamin ether stabilizer.

[0046] The preparation method of the two-component grouting material for roadbed settlement treatment in this embodiment includes the following steps: (1) Weigh each raw material according to the formula of component A, mix each raw material thoroughly and evenly, add water and stir at a water-to-material ratio of 0.45 to form component A slurry; (2) Weigh the water glass solution and stabilizer according to the formula of component B material, and fully dissolve the stabilizer in the water glass solution to form component B slurry; (3) Weigh out component A grout and component B grout in a mass ratio of 1:0.8 and mix them to form a two-component grouting material for roadbed settlement treatment.

[0047] Example 6 This embodiment provides a two-component grouting material for roadbed settlement treatment, comprising component A and component B; The A component material includes the following components by weight: 60.8 parts of P·O 42.5R cement, 22 parts of S95 grade mineral powder, 13 parts of 120~200 mesh stone powder, 1.0 part of polycarboxylate superplasticizer, 0.7 parts of sulfoaluminate expansive agent and 2.5 parts of composite regulator. Component B comprises the following components in parts by weight: 99.96 parts of water glass solution and 0.04 parts of stabilizer, wherein the modulus of the water glass solution is 2.8 and the concentration is 30°Bé, and the stabilizer is a vitamin ether stabilizer.

[0048] The preparation method of the two-component grouting material for roadbed settlement treatment in this embodiment includes the following steps: (1) Weigh each raw material according to the formula of component A, mix each raw material thoroughly and evenly, add water and stir at a water-to-material ratio of 0.45 to form component A slurry; (2) Weigh the water glass solution and stabilizer according to the formula of component B material, and fully dissolve the stabilizer in the water glass solution to form component B slurry; (3) Weigh out component A grout and component B grout in a mass ratio of 1:0.8 and mix them to form a two-component grouting material for roadbed settlement treatment.

[0049] Example 7 This embodiment provides a two-component grouting material for roadbed settlement treatment, comprising component A and component B; The A component material includes the following components by weight: 59.8 parts of P·O 42.5R cement, 22 parts of S95 grade mineral powder, 13 parts of 120~200 mesh stone powder, 1.0 part of polycarboxylate superplasticizer, 0.7 parts of sulfoaluminate expansive agent and 3.5 parts of composite regulator. Component B comprises the following components in parts by weight: 99.96 parts of water glass solution and 0.04 parts of stabilizer, wherein the modulus of the water glass solution is 2.8 and the concentration is 30°Bé, and the stabilizer is a vitamin ether stabilizer.

[0050] The preparation method of the two-component grouting material for roadbed settlement treatment in this embodiment includes the following steps: (1) Weigh each raw material according to the formula of component A, mix each raw material thoroughly and evenly, add water and stir at a water-to-material ratio of 0.45 to form component A slurry; (2) Weigh the water glass solution and stabilizer according to the formula of component B material, and fully dissolve the stabilizer in the water glass solution to form component B slurry; (3) Weigh out component A grout and component B grout in a mass ratio of 1:0.8 and mix them to form a two-component grouting material for roadbed settlement treatment.

[0051] Comparative Example 1 This comparative example provides a two-component grouting material, including component A and component B; The A component material consists of the following parts by weight: 98.2 parts of P·O 42.5R cement, 1.0 part of polycarboxylate superplasticizer, and 0.7 parts of sulfoaluminate expansive agent. That is, no mineral powder, stone powder and composite regulator are added to the A component formula of this comparative example. Component B comprises the following components in parts by weight: 99.96 parts of water glass solution and 0.04 parts of stabilizer, wherein the modulus of the water glass solution is 2.8 and the concentration is 30°Bé, and the stabilizer is a vitamin ether stabilizer.

[0052] The preparation method of the two-component grouting material for subgrade settlement treatment in this comparative example includes the following steps: (1) Weigh each raw material according to the formula of component A, mix each raw material thoroughly and evenly, add water and stir at a water-to-material ratio of 0.45 to form component A slurry; (2) Weigh the water glass solution and stabilizer according to the formula of component B material, and fully dissolve the stabilizer in the water glass solution to form component B slurry; (3) Weigh out component A slurry and component B slurry in a mass ratio of 1:0.8 and stir to form a two-component grouting material.

[0053] Comparative Example 2 This comparative example provides a two-component grouting material, including component A and component B; The A component material consists of the following components by weight: 99 parts of P·O 42.5R cement and 1.0 part of polycarboxylate superplasticizer. That is, no mineral powder, stone powder, expansion agent and composite regulator are added to the A component formula of this comparative example. Component B comprises the following components in parts by weight: 99.96 parts of water glass solution and 0.04 parts of stabilizer, wherein the modulus of the water glass solution is 2.8 and the concentration is 30°Bé, and the stabilizer is a vitamin ether stabilizer.

[0054] The preparation method of the two-component grouting material for subgrade settlement treatment in this comparative example includes the following steps: (1) Weigh each raw material according to the formula of component A, mix each raw material thoroughly and evenly, add water and stir at a water-to-material ratio of 0.45 to form component A slurry; (2) Weigh the water glass solution and stabilizer according to the formula of component B material, and fully dissolve the stabilizer in the water glass solution to form component B slurry; (3) Weigh out component A slurry and component B slurry in a mass ratio of 1:0.8 and stir to form a two-component grouting material.

[0055] Specifically, the performance of the two-component grouting materials prepared in Examples 1-7 and Comparative Examples 1-2 was tested, and the test results are shown in Table 1 below:

[0056] Table 1 Performance Test Results Specifically, a comparison of the results of each embodiment and comparative example shows that the two-component grouting materials for roadbed settlement treatment provided in Examples 1-7 have good micro-expansion and mechanical properties, and the gel time can be adjusted according to the amount of composite regulator added, making them suitable for roadbed settlement treatment and lifting, and improving overall stress performance. Furthermore, the test results of setting time and compressive strength show that in Examples 1-7, the compressive strength of the two-component grouting materials gradually increases with the extension of gel time. This demonstrates that the present invention can enhance the compressive strength of the two-component grouting materials while extending their gel time.

[0057] Therefore, the incorporation of the composite modifier can controllably adjust the gel time of the two-component grouting material for roadbed settlement control. The gel time can be adjusted according to on-site application requirements, and the incorporation of the composite modifier helps improve the micro-expansion effect of the grout, resulting in improved later-stage strength. Without the composite modifier, the gel time of the two-component grouting material is <20s; as the amount of composite modifier increases, the gel time of the two-component grouting material prolongs. In the examples, the incorporation of mineral powder and stone powder (1-7) helps improve the strength of the two-component grouting material, and the incorporation of the expansion agent helps prevent grout shrinkage, achieving a better filling effect and preventing roadbed settlement.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A two-component grouting material for roadbed settlement control, characterized in that, Includes component A materials and component B materials; The A component material comprises the following components in parts by weight: 55-70 parts cement, 15-30 parts mineral powder, 10-20 parts stone powder, 0.2-1.5 parts water-reducing agent, 0.1-1 parts expansion agent, and 0-4 parts composite regulator; wherein the composite regulator comprises borax, sodium phosphate, and sodium citrate. The B component material comprises the following components in parts by weight: 99-99.99 parts of water glass solution and 0.01-1 parts of stabilizer.

2. The dual-component grouting material for roadbed settlement control according to claim 1, characterized in that, The weight ratio of borax to sodium citrate in the composite regulator is 2.5:2 to 3.5:2; The weight ratio of sodium phosphate to sodium citrate is 4.5:2 to 5.5:

2.

3. The dual-liquid grouting material for roadbed settlement control according to claim 2, characterized in that, The weight ratio of borax, sodium phosphate, and sodium citrate in the composite regulator is 3:5:

2.

4. The dual-component grouting material for roadbed settlement control according to claim 1, characterized in that, The cement has a strength grade ≥ 42.5, and the mineral powder has a 28-day activity index ≥ 95%.

5. The dual-component grouting material for roadbed settlement control according to claim 1, characterized in that, The water glass solution has a modulus of 2.5 to 3.5 and a concentration of 20 to 35°Bé.

6. The dual-component grouting material for roadbed settlement control according to claim 1, characterized in that, The fineness of the stone powder is 120~200 mesh.

7. The dual-component grouting material for roadbed settlement control according to claim 1, characterized in that, The water-reducing agent is one or more of aliphatic water-reducing agents, polycarboxylate water-reducing agents, and sulfonate water-reducing agents; The stabilizer is a cellulose ether stabilizer.

8. The dual-component grouting material for roadbed settlement control according to claim 1, characterized in that, The expanding agent is one or more of sulfoaluminate expanding agents, aluminate expanding agents, and calcium oxide expanding agents.

9. A method for preparing a two-component grouting material for roadbed settlement control, characterized in that, The preparation of the two-component grouting material for roadbed settlement treatment according to any one of claims 1-8 includes the following steps: (1) Weigh cement, mineral powder, stone powder, water-reducing agent, expansion agent and composite regulator according to the formula, mix the weighed materials evenly according to the formula to obtain component A material; add water and mix with component A material according to the water-material ratio of 0.35~0.6 to obtain component A slurry; (2) Weigh the water glass solution and stabilizer according to the formula, and then fully dissolve the stabilizer in the water glass solution to obtain component B material; (3) Mix component A slurry and component B material evenly to obtain a two-component grouting material for roadbed settlement treatment.

10. The preparation method of the two-component grouting material for roadbed settlement treatment according to claim 9, characterized in that, In step (3), the A component slurry and the B component material are mixed evenly according to the mass ratio of A component slurry to B component material of 1:0.5~1:1.2 to obtain the two-liquid grouting material for roadbed settlement treatment.

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