High-flow early-strength two-component cement-based grouting material and application thereof

Abstract

The application relates to the technical field of cement materials, in particular to a high-flow early-strength type two-component cement-based grouting material and application thereof. The A component of the grouting material comprises: 100 parts by weight of sulphoaluminate cement, 0.5-2.0 parts by weight of a composite reinforcing agent, 0.2-0.3 parts by weight of a powder water reducing agent, 0.1-0.2 parts by weight of a defoaming agent and 25-30 parts by weight of water. The B component comprises: 90-95 parts by weight of Portland cement, 3-5 parts by weight of calcium hydroxide, 0.1-0.15 parts by weight of lithium carbonate, 2-3 parts by weight of silica fume, 0.3-0.4 parts by weight of a powder water reducing agent and 25-28 parts by weight of water. The composite reinforcing agent is mainly composed of anorthite phase, amorphous boron-silicon-aluminum-calcium glass phase and the like. The application effectively overcomes the problem that the single-component fluidity retention and the early-strength performance after mixing are difficult to be well balanced by taking the programmed phase transition of the composite reinforcing agent in a specific chemical environment as a function switch.

Description

Technical Field

[0001] This invention relates to the field of cement materials technology, specifically to a high-flow, early-strength, two-component cement-based grouting material 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 this 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] Sulfoaluminate cement is characterized by early strength and rapid hardening, but its short setting time makes it difficult to use alone in grouting projects requiring long working times or long-distance transportation. While silicate cement offers good workability and relatively controllable setting time, its slow early strength development makes it difficult to meet the stringent hourly strength requirements of engineering projects. Two-component grouting materials, by introducing a retarder in component A and a tamper-evident agent in component B, achieve a synergistic effect of "long-term flowability of single components + rapid hardening after mixing," thus solving the aforementioned problems to some extent.

[0004] Currently, the retarder used in two-component grouting materials is typically boric acid or borax, which slows down the hydration of sulfoaluminate cement by forming a slow-release protective film in component A. The activator is usually calcium hydroxide. After components A and B are mixed, the activator reacts with boric acid to form calcium borate precipitate, breaking down the retarding protective film and achieving rapid hardening. However, the calcium borate precipitate does not contribute to strength development, resulting in a waste of boron resources. More importantly, both existing retarder and activator are in a "free state," making it difficult to precisely control their reaction rate, resulting in a difficulty in achieving a good balance between maintaining the fluidity of the single component and the early strength performance after mixing. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a high-flow, early-strength, two-component cement-based grouting material and its application. It utilizes a programmed phase transition of a composite reinforcing agent with a specific mineral phase in a specific chemical environment as a functional switch, effectively overcoming the difficulty in achieving a good balance between maintaining the flowability of a single-component material and maintaining early-strength performance after mixing. Specifically, the technical solution of this invention is as follows.

[0006] First, this invention provides a high-flow, early-strength, two-component cement-based grouting material. Component A comprises: 100 parts by weight of sulfoaluminate cement, 0.5-2.0 parts by weight of composite reinforcing agent, 0.2-0.3 parts by weight of powder water-reducing agent, 0.1-0.2 parts by weight of defoamer, and 25-30 parts by weight of water. Component B comprises: 90-95 parts by weight of silicate cement, 3-5 parts by weight of calcium hydroxide, 0.1-0.15 parts by weight of lithium carbonate, 2-3 parts by weight of silica fume, 0.3-0.4 parts by weight of powder water-reducing agent, and 25-28 parts by weight of water. The composite reinforcing agent, by mass percentage, is composed of the following mineral phases: 29.7-51.7% calcium feldspar phase (CaAl2Si2O8), 26.8-33.1% amorphous borosilicate aluminum calcium glass phase, 6.7-17.8% calcium ochre phase (Ca2Al2SiO7), 9.7-15.6% pseudowollastonite phase (CaSiO3), with the remainder being silicate heterocrystalline phases and unavoidable impurities.

[0007] Furthermore, the composite reinforcing agent is prepared by the following method: siliceous borosilicate powder, anorthite powder, wollastonite powder, and kaolin are mixed and then calcined. After the calcination is completed, the resulting calcined product is rapidly cooled to room temperature, crushed, and then ground to obtain the composite reinforcing agent.

[0008] Furthermore, by mass percentage, the proportions of each component are as follows: 25-40% for the borosilicate mineral powder, 20-35% for the anorthite mineral powder, 15-25% for the wollastonite mineral powder, and 10-20% for the kaolin.

[0009] Furthermore, the calcination treatment is carried out at a temperature of 1180~1220℃ for 3~3.5 hours.

[0010] Furthermore, the fineness of the composite reinforcing agent is 400-500 mesh.

[0011] Furthermore, the powder water-reducing agent includes at least one of the following: polycarboxylate water-reducing agent, naphthalene-based water-reducing agent, lignin sulfonate water-reducing agent, etc.

[0012] Further, the composite reinforcing agent is a surface-boron-rich reinforcing agent obtained by boric acid modification. Preferably, the surface-boron-rich reinforcing agent is prepared by the following method: the composite reinforcing agent is mixed with a boric acid solution and stirred, and the solid product is separated and dried after the process is completed to obtain the final product.

[0013] Further, the mass ratio of the composite reinforcing agent to the boric acid solution is 1:2~5. Optionally, the mass fraction of the boric acid solution is 0.1~0.5%.

[0014] Furthermore, the stirring time is 30-60 minutes.

[0015] Secondly, this invention provides the application of the high-flow, early-strength, two-component cement-based grouting material in bridge engineering, road engineering, marine engineering, and other fields.

[0016] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects: This invention utilizes a composite reinforcing agent composed of specific mineral phases. This agent remains stable in low-calcium sulfoaluminate cement paste (i.e., component A above), and upon mixing with high-calcium silicate cement (i.e., component B above), it transforms into a setting accelerator, releasing active ions to participate in the hydration reaction and enhance strength. This achieves a "retarded setting-triggered-enhanced" mechanism, effectively overcoming the problem of simultaneously maintaining the fluidity of a single component and achieving early strength performance after mixing. This is because: the Al in the early hydration liquid phase of component A... 3+ High concentration and Ca 2+ The concentration is relatively low. In this environment, the calcium feldspar phase, pseudowollastonite phase, and other components in the composite reinforcing agent remain stable, while the amorphous borosilicate aluminum calcium glass phase releases borate ions (BO3+) in the low-alkaline environment of component A. 3- The main component is α, which adsorbs onto the surface of sulfoaluminate cement particles and reacts with the Ca released during the hydration of the cement particles. 2+ The reaction generates a dense calcium borate slow-release film, thereby slowing down the hydration process of sulfoaluminate cement and providing a mild retarding effect. This surface micro-release mechanism ensures that component A maintains high fluidity for a longer period after water addition, meeting the operational requirements of long-distance transportation and long-term construction. When components A and B are mixed, tricalcium silicate (C3S) and dicalcium silicate (C2S) in the silicate cement rapidly hydrate and release a large amount of calcium ions, increasing the Ca content in the liquid phase of the mixed system. 2+ The concentration surged, and the pH of the system rose rapidly. Under this high-calcium, high-alkali environment, the amorphous borosilicate-aluminum-calcium glass phase in the composite reinforcing agent underwent intense chemical erosion and began to depolymerize, releasing Al. 3+ Ca 2+ SiO4 4- The presence of reactive ions, while the anorthite phase gradually dissolves during hydration, replenishing Al content for later strength development. 3+ Ca 2+ SiO4 4- Active ions. On the one hand, drastic changes in ionic strength and pH disrupt the dissolution balance of the slow-release calcium borate film on the surface of sulfoaluminate cement particles, causing it to gradually dissolve and re-expose the sulfoaluminate cement particles to contact water, achieving a programmed transition from retarded to accelerated setting. On the other hand, the released Al... 3+ It participates in the rapid formation of ettringite (AFt), which can quickly interlock to form an initial skeleton structure, improving the early strength of the grouting material. The released SiO4...4- It participates in the formation of hydrated calcium silicate (CSH) gel, continuously contributing to the later-stage strength development. The released Ca... 2+ It can participate in a variety of hydration reactions, including with SiO4. 4- It forms CSH gel and reacts with aluminate and sulfate ions to form ettringite, etc. In particular, Al released during the phase transition of the reinforcing agent... 3+ BO3 3- Ca 2+ SiO4 4- Under coexisting conditions, a boron-containing ettringite-like intermediate phase is also generated. Its micro-expansion characteristics effectively compensate for the shrinkage generated during the hardening process of the grouting material, reducing the risk of cracking and improving long-term durability. Therefore, this invention simultaneously achieves the "retardation-triggering-strengthening" function through a composite reinforcing agent, transforming the "programmed phase transformation" of a specific mineral phase into a functional switch, effectively overcoming the problem of simultaneously maintaining the fluidity of a single component and achieving early strength performance after mixing. Furthermore, this invention also performs surface boron enrichment treatment on the composite reinforcing agent, thereby forming a boron-rich micro-region on the surface of the composite reinforcing agent. This allows for the rapid release of borate ions in the initial stage of water addition to component A, ensuring the rapid formation of the slow-release film of calcium borate on the surface of the sulfoaluminate cement particles. This surface boron-rich layer, as a second-level protection, works synergistically with the boron-containing silica-alumina-calcium glass phase carried by the reinforcing agent itself, ensuring both rapid initial response and a continuous and stable boron source supply. Additionally, the pseudo-wollastonite phase, a byproduct of the composite reinforcing agent... It can preferentially react with carbon dioxide infiltrating the grouting material to form calcium carbonate and silica gel, overcoming the insufficient carbonation resistance of ettringite (AFt) and effectively improving the durability of the grouting material of the present invention. Simultaneously, the silica gel can also seal the pores in the grouting material matrix, helping to reduce carbon dioxide intrusion. Another byproduct of the composite reinforcing agent, the calcium feldspar phase (CaAl2Si2O8), can also act as a physical barrier against SO4. 2- Penetration and erosion enhance the freeze-thaw cycle resistance of the grouting material of this invention, making it suitable for application in environments with frequent freeze-thaw cycles in frigid regions. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] Figure 1 The image shows a sample of the composite reinforcing agent prepared in Example 1 below.

[0019] Figure 2 The image shows a scanning electron microscope (SEM) image of the composite reinforcing agent prepared in Example 1 below.

[0020] Figure 3 The X-ray diffraction (XRD) pattern is shown for the composite reinforcing agent prepared in Example 1 below.

[0021] Figure 4 The image shows a sample of the composite reinforcing agent prepared in Example 2 below.

[0022] Figure 5 The image shows a scanning electron microscope (SEM) image of the composite reinforcing agent prepared in Example 2 below.

[0023] Figure 6 The image shows a sample of the composite reinforcing agent prepared in Example 3 below.

[0024] Figure 7 The image shows a sample of the composite reinforcing agent prepared in Example 4 below.

[0025] Figure 8 The image shows a sample of the surface boron-enriched reinforcing agent prepared in Example 5 below.

[0026] Figure 9 The image shows a sample of the surface boron-enriched reinforcing agent prepared in Example 6 below.

[0027] Figure 10 The image shows a sample of the composite reinforcing agent prepared in Example 7 below.

[0028] Figure 11 The image shows a sample of the composite reinforcing agent prepared in Example 8 below. Detailed Implementation

[0029] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer.

[0030] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as those skilled in the art. The reagents or raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they are used in accordance with conventional methods or product instructions. Furthermore, any methods and materials similar to or equivalent to those described herein can be applied to the methods of this invention. The technical solution of this invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0031] Example 1 A method for preparing a high-flowability, early-strength, two-component cement-based grouting material includes the following steps: (1) Weigh the following raw materials according to the following mass percentages: 30% borosilicate powder, 30% anorthite powder, 20% wollastonite powder, and 20% kaolin. Mix the raw materials evenly and place them in a corundum crucible. Then place the crucible in a high-temperature furnace and heat it to 1200℃ at a heating rate of 8℃ / min for 3 hours. After completion, the calcined product is rapidly cooled to room temperature by blowing air, then coarsely crushed in a jaw crusher, and then ground in a ball mill for 4 hours. The powder is then passed through a 400-mesh sieve to obtain the composite reinforcing agent (e.g., Figure 1 As shown), its SEM and XRD test images are as follows: Figure 2 , Figure 3 As shown. The composition of the composite reinforcing agent was measured to be (mass percentage): 48.4% calcium feldspar phase (CaAl2Si2O8), 29.1% amorphous borosilicate aluminum calcium glass phase, 7.5% calcium ochre phase (Ca2Al2SiO7), 9.7% pseudowollastonite phase (CaSiO3), and the balance being silicate heterocrystalline phase and unavoidable impurities.

[0032] (2) According to the ratio of sulfoaluminate cement (strength grade 42.5): composite reinforcing agent in this embodiment: powdered polycarboxylate superplasticizer: polyether defoamer: water = 100 parts by weight: 1 part by weight: 0.25 parts by weight: 0.15 parts by weight: 27 parts by weight, mix the components and stir evenly to obtain component A, which is ready for use.

[0033] (3) Mix the components according to the ratio of ordinary silicate cement (PO 42.5): calcium hydroxide: lithium carbonate: silica fume: powdered polycarboxylate superplasticizer: water = 93 parts by weight: 4 parts by weight: 0.12 parts by weight: 2.5 parts by weight: 0.35 parts by weight: 26 parts by weight, and stir evenly to obtain component B, which is ready for use.

[0034] Performance testing: 1. According to GB / T 50448-2015 "Technical Specification for Application of Cement-based Grouting Materials", the initial flowability and 30-minute flowability of components A and B in this embodiment were tested respectively. The results are as follows: initial flowability of component A = 281 mm, 30-minute flowability = 273 mm; initial flowability of component B = 281 mm, 30-minute flowability = 274 mm.

[0035] 2. Mix components A and B and stir for 1 minute to obtain the grouting material. Then test the initial setting time and final setting time of the grouting material. The results are: initial setting time = 15 min, final setting time = 27 min.

[0036] 3. Mix components A and B and stir for 1 minute to obtain the grouting material. Prepare specimens (without adding standard sand) and test their compressive strength at curing ages of 2 hours, 1 day, and 28 days according to GB / T 17671-2021 "Test Method for Strength of Cement Mortar (ISO Method)". The results are: 2-hour compressive strength = 24.5 MPa, 1-day compressive strength = 38.2 MPa, and 28-day compressive strength = 59.3 MPa.

[0037] 4. Mix components A and B and stir for 1 minute to obtain grouting material. After making specimens, carbonation test is carried out according to GBT50082-2024 "Standard for Test Methods of Long-term Performance and Durability of Concrete". The result is: average carbonation depth of 14 days = 3.4 mm.

[0038] Example 2 A method for preparing a high-flowability, early-strength, two-component cement-based grouting material includes the following steps: (1) Weigh the following raw materials according to the following mass percentages: 40% borosilicate powder, 35% anorthite powder, 15% wollastonite powder, and 10% kaolin. Mix the raw materials evenly and place them in a corundum crucible. Then place the crucible in a high-temperature furnace and heat it to 1220℃ at a heating rate of 8℃ / min for 3 hours. After completion, the calcined product is rapidly cooled to room temperature by blowing air, then coarsely crushed in a jaw crusher, and then ground in a ball mill for 4 hours. The powder is then passed through a 500-mesh sieve to obtain the composite reinforcing agent (e.g., Figure 4 As shown), its SEM test image is as follows. Figure 5 As shown. The composition of the composite reinforcing agent was measured to be (mass percentage): 40.2% calcium feldspar phase, 33.1% amorphous borosilicate aluminum-calcium glass phase, 12.4% calcium ochre phase, 9.9% pseudowollastonite phase, with the balance being silicate heterocrystalline phase and unavoidable impurities.

[0039] (2) According to the ratio of sulfoaluminate cement (strength grade 42.5): composite reinforcing agent in this embodiment: powdered polycarboxylate superplasticizer: polyether defoamer: water = 100 parts by weight: 2 parts by weight: 0.3 parts by weight: 0.2 parts by weight: 30 parts by weight, mix the components and stir evenly to obtain component A, which is ready for use.

[0040] (3) Mix the components according to the ratio of ordinary silicate cement (PO 42.5): calcium hydroxide: lithium carbonate: silica fume: powdered polycarboxylate superplasticizer: water = 95 parts by weight: 5 parts by weight: 0.15 parts by weight: 3 parts by weight: 0.4 parts by weight: 28 parts by weight, and stir evenly to obtain component B, which is ready for use.

[0041] Performance testing: 1. The initial flowability and 30-minute flowability of components A and B in this embodiment were tested using the same method as in Example 1 above. The results were: initial flowability of component A = 285 mm, 30-minute flowability = 278 mm; initial flowability of component B = 280 mm, 30-minute flowability = 272 mm.

[0042] 2. The initial setting time and final setting time of the grouting material formed by components A and B in this embodiment were tested using the same method as in Example 1 above. The results were: initial setting time = 19 min, final setting time = 33 min.

[0043] 3. The 2h, 1d, and 28d compressive strengths of the specimens made from the grouting material of this embodiment were measured using the same method as in Example 1 above. The results were: 2h compressive strength = 22.5 MPa, 1d compressive strength = 36.1 MPa, and 28d compressive strength = 57.4 MPa.

[0044] 4. The 14-day average carbonization depth of the specimen made of the grouting material in this embodiment was measured to be 4.8 mm using the same method as in Example 1 above.

[0045] Example 3 A method for preparing a high-flowability, early-strength, two-component cement-based grouting material includes the following steps: (1) Weigh the following raw materials according to the following mass percentages: 25% borosilicate powder, 30% anorthite powder, 25% wollastonite powder, and 20% kaolin. Mix the raw materials evenly and place them in a corundum crucible. Then place the crucible in a high-temperature furnace and heat it to 1180℃ at a heating rate of 8℃ / min. Hold the temperature for 3.5 hours. After completion, cool the calcined product to room temperature by blowing air through it. Then crush it in a jaw crusher and grind it in a ball mill for 4 hours. Pass the powder through a 500-mesh sieve to obtain the composite reinforcing agent (e.g., Figure 6 As shown in the figure, its composition was measured to be (mass percentage): 51.7% calcium feldspar phase, 26.8% amorphous borosilicate aluminum calcium glass phase, 6.7% calcium ochre phase, 10.6% pseudowollastonite phase, with the remainder being silicate heterocrystalline phase and unavoidable impurities.

[0046] (2) According to the ratio of sulfoaluminate cement (strength grade 42.5): composite reinforcing agent in this embodiment: powdered polycarboxylate superplasticizer: polyether defoamer: water = 100 parts by weight: 0.5 parts by weight: 0.2 parts by weight: 0.1 parts by weight: 25 parts by weight, mix the components and stir evenly to obtain component A, which is ready for use.

[0047] (3) Mix the components according to the ratio of ordinary silicate cement (PO 42.5): calcium hydroxide: lithium carbonate: silica fume: powdered polycarboxylate superplasticizer: water = 90 parts by weight: 3 parts by weight: 0.1 parts by weight: 2 parts by weight: 0.3 parts by weight: 25 parts by weight, and stir evenly to obtain component B, which is ready for use.

[0048] Performance testing: 1. The initial flowability and 30-minute flowability of components A and B in this embodiment were tested using the same method as in Example 1 above. The results were: initial flowability of component A = 266 mm, 30-minute flowability = 258 mm; initial flowability of component B = 278 mm, 30-minute flowability = 269 mm.

[0049] 2. The initial setting time and final setting time of the grouting material formed by components A and B in this embodiment were tested using the same method as in Example 1 above. The results were: initial setting time = 14 min, final setting time = 26 min.

[0050] 3. The 2h, 1d, and 28d compressive strengths of the specimens made from the grouting material of this embodiment were measured using the same method as in Example 1 above. The results were: 2h compressive strength = 23.8 MPa, 1d compressive strength = 39.1 MPa, and 28d compressive strength = 60.5 MPa.

[0051] 4. The 14-day average carbonization depth of the specimen made of the grouting material in this embodiment was measured to be 2.9 mm using the same method as in Example 1 above.

[0052] Example 4 A method for preparing a high-flowability, early-strength, two-component cement-based grouting material includes the following steps: Weigh the following raw materials according to the following mass percentages: 40% borosilicate powder, 20% anorthite powder, 25% wollastonite powder, and 15% kaolin. Mix the raw materials evenly and place them in a corundum crucible. Then, place the crucible in a high-temperature furnace and heat to 1200℃ at a heating rate of 8℃ / min, holding for 3.5 hours. After completion, rapidly cool the calcined product to room temperature by blowing air, then coarsely crush it in a jaw crusher, and then grind it in a ball mill for 4 hours. Pass the powder through a 450-mesh sieve to obtain the composite reinforcing agent (e.g., ...). Figure 7 As shown in the figure, its composition was measured to be (mass percentage): 29.7% calcium feldspar phase, 29.9% amorphous borosilicate aluminum-calcium glass phase, 17.8% calcium ochre phase, 15.6% pseudowollastonite phase, with the remainder being silicate heterocrystalline phase and unavoidable impurities.

[0053] (2) According to the ratio of sulfoaluminate cement (strength grade 42.5): composite reinforcing agent in this embodiment: powdered polycarboxylate superplasticizer: polyether defoamer: water = 100 parts by weight: 1.5 parts by weight: 0.2 parts by weight: 0.15 parts by weight: 28 parts by weight, mix the components and stir evenly to obtain component A, which is ready for use.

[0054] (3) Mix the components according to the ratio of ordinary silicate cement (PO 42.5): calcium hydroxide: lithium carbonate: silica fume: powdered polycarboxylate superplasticizer: water = 92 parts by weight: 3.5 parts by weight: 0.1 parts by weight: 2.5 parts by weight: 0.3 parts by weight: 26 parts by weight, and stir evenly to obtain component B, which is ready for use.

[0055] Performance testing: 1. The initial flowability and 30-minute flowability of components A and B in this embodiment were tested using the same method as in Example 1 above. The results were: initial flowability of component A = 281 mm, 30-minute flowability = 275 mm; initial flowability of component B = 284 mm, 30-minute flowability = 277 mm.

[0056] 2. The initial setting time and final setting time of the grouting material formed by components A and B in this embodiment were tested using the same method as in Example 1 above. The results were: initial setting time = 18 min, final setting time = 31 min.

[0057] 3. The 2h, 1d, and 28d compressive strengths of the specimens made from the grouting material of this embodiment were measured using the same method as in Example 1 above. The results were: 2h compressive strength = 18.9 MPa, 1d compressive strength = 35.5 MPa, and 28d compressive strength = 53.5 MPa.

[0058] 4. The 14-day average carbonization depth of the specimen made of the grouting material in this embodiment was measured to be 4.2 mm using the same method as in Example 1 above.

[0059] Example 5 A method for preparing a high-flowability, early-strength, two-component cement-based grouting material includes the following steps: (1) The composite reinforcing agent prepared in Example 1 above is mixed with a boric acid solution with a mass fraction of 0.5% at a mass ratio of 1:2 and stirred continuously for 30 min. After completion, the solid product is filtered out and dried at 80°C to remove moisture, thus obtaining the surface boron-enriched reinforcing agent (e.g. Figure 8 (As shown), for later use.

[0060] (2) According to the ratio of sulfoaluminate cement (strength grade 42.5): surface boron-enriched reinforcing agent in this embodiment: powdered polycarboxylate superplasticizer: polyether defoamer: water = 100 parts by weight: 1 part by weight: 0.25 parts by weight: 0.15 parts by weight: 27 parts by weight, mix the components and stir evenly to obtain component A, which is ready for use.

[0061] (3) Mix the components according to the ratio of ordinary silicate cement (PO 42.5): calcium hydroxide: lithium carbonate: silica fume: powdered polycarboxylate superplasticizer: water = 93 parts by weight: 4 parts by weight: 0.12 parts by weight: 2.5 parts by weight: 0.35 parts by weight: 26 parts by weight, and stir evenly to obtain component B, which is ready for use.

[0062] Performance testing: 1. The initial flowability and 30-minute flowability of component A in this embodiment were tested using the same method as in Example 1 above. The results were: initial flowability of component A = 289 mm, and 30-minute flowability = 280 mm.

[0063] 2. The initial setting time and final setting time of the grouting material formed by components A and B in this embodiment were tested using the same method as in Example 1 above. The results were: initial setting time = 16 min, final setting time = 29 min.

[0064] 3. The 2h, 1d, and 28d compressive strengths of the specimens made from the grouting material of this embodiment were measured using the same method as in Example 1 above. The results were: 2h compressive strength = 27.8 MPa, 1d compressive strength = 40.4 MPa, and 28d compressive strength = 56.6 MPa.

[0065] 4. The 14-day average carbonization depth of the specimen made of the grouting material in this embodiment was measured to be 3.8 mm using the same method as in Example 1 above.

[0066] Example 6 A method for preparing a high-flowability, early-strength, two-component cement-based grouting material includes the following steps: (1) The composite reinforcing agent prepared in Example 2 above was mixed with a boric acid solution with a mass fraction of 0.1% at a mass ratio of 1:5 and stirred continuously for 60 min. After completion, the solid product was filtered out and dried at 80°C to remove moisture, thus obtaining the surface boron-enriched reinforcing agent (e.g. Figure 9 (As shown), for later use.

[0067] (2) According to the ratio of sulfoaluminate cement (strength grade 42.5): surface boron-enriched reinforcing agent in this embodiment: powdered polycarboxylate superplasticizer: polyether defoamer: water = 100 parts by weight: 2 parts by weight: 0.3 parts by weight: 0.2 parts by weight: 30 parts by weight, mix the components and stir evenly to obtain component A, which is ready for use.

[0068] (3) Mix the components according to the ratio of ordinary silicate cement (PO 42.5): calcium hydroxide: lithium carbonate: silica fume: powdered polycarboxylate superplasticizer: water = 95 parts by weight: 5 parts by weight: 0.15 parts by weight: 3 parts by weight: 0.4 parts by weight: 28 parts by weight, and stir evenly to obtain component B, which is ready for use.

[0069] Performance testing: 1. The initial flowability and 30-minute flowability of component A in this embodiment were tested using the same method as in Example 1 above. The results were: initial flowability of component A = 290 mm, and 30-minute flowability = 283 mm.

[0070] 2. The initial setting time and final setting time of the grouting material formed by components A and B in this embodiment were tested using the same method as in Example 1 above. The results were: initial setting time = 18 min, final setting time = 31 min.

[0071] 3. The 2h, 1d, and 28d compressive strengths of the specimens made from the grouting material of this embodiment were measured using the same method as in Example 1 above. The results were: 2h compressive strength = 23.6 MPa, 1d compressive strength = 37.8 MPa, and 28d compressive strength = 59.9 MPa.

[0072] 4. The 14-day average carbonization depth of the specimen made of the grouting material in this embodiment was measured to be 4.5 mm using the same method as in Example 1 above.

[0073] Example 7 A method for preparing a high-flow, early-strength, two-component cement-based grouting material is the same as in Example 4 above, except that the composite reinforcing agent in this example is prepared by the following method: Weigh the raw materials according to the following mass percentages: 33.33% anorthite powder, 41.28% wollastonite powder, and 25.39% kaolin. Mix the raw materials thoroughly and place them in a corundum crucible. Then, place the crucible in a high-temperature furnace and heat to 1200℃ at a heating rate of 8℃ / min, holding for 3.5 hours. After completion, rapidly cool the calcined product to room temperature by blowing air, then coarsely crush it in a jaw crusher, and then grind it in a ball mill for 4 hours. Pass the powder through a 450-mesh sieve to obtain the composite reinforcing agent (e.g., ...). Figure 10 As shown in the figure, its composition (mass percentage) was measured to be: 38.1% calcium feldspar phase, 18.2% calcium ochre phase, 38.8% pseudowollastonite phase, with the remainder being silicate heterocrystal phase and unavoidable impurities.

[0074] Performance testing: 1. The initial flowability and 30-minute flowability of component A in this embodiment were tested using the same method as in Example 1 above. The results were: initial flowability of component A = 207 mm, and 30-minute flowability = 181 mm.

[0075] 2. The initial setting time and final setting time of the grouting material formed by components A and B in this embodiment were tested using the same method as in Example 1 above. The results were: initial setting time = 11 min, final setting time = 18 min.

[0076] 3. The 2h, 1d, and 28d compressive strengths of the specimens made from the grouting material of this embodiment were measured using the same method as in Example 1 above. The results were: 2h compressive strength = 19.4 MPa, 1d compressive strength = 36.7 MPa, and 28d compressive strength = 50.2 MPa.

[0077] 4. The 14-day average carbonization depth of the specimen made of the grouting material in this embodiment was measured to be 5.1 mm using the same method as in Example 1 above.

[0078] Example 8 A method for preparing a high-flow, early-strength, two-component cement-based grouting material is the same as in Example 2 above, except that the composite reinforcing agent in this example is prepared by the following method: Weigh the raw materials according to the following mass percentages: 47.06% borosilicate calcium ore powder, 41.18% anorthite ore powder, and 11.76% kaolin. Mix the raw materials evenly and place them in a corundum crucible. Then, place the crucible in a high-temperature furnace and heat to 1220℃ at a heating rate of 8℃ / min, holding for 3 hours. After completion, rapidly cool the calcined product to room temperature by blowing air, then coarsely crush it in a jaw crusher, and then grind it in a ball mill for 4 hours. Pass the powder through a 500-mesh sieve to obtain the composite reinforcing agent (e.g., ...). Figure 11 As shown), its composition was measured to be (mass percentage): 39.6% calcium feldspar phase, 39.8% amorphous borosilicate aluminum calcium glass phase, 13.5% calcium ochre phase, 1.9% pseudowollastonite phase, and the balance being silicate heterocrystalline phase and unavoidable impurities.

[0079] Performance testing: 1. The initial flowability and 30-minute flowability of component A in this embodiment were tested using the same method as in Example 1 above. The results were: initial flowability of component A = 288 mm, and 30-minute flowability = 281 mm.

[0080] 2. The initial setting time and final setting time of the grouting material formed by components A and B in this embodiment were tested using the same method as in Example 1 above. The results were: initial setting time = 21 min, final setting time = 38 min.

[0081] 3. The 2h, 1d, and 28d compressive strengths of the specimens made from the grouting material of this embodiment were measured using the same method as in Example 1 above. The results were: 2h compressive strength = 20.5 MPa, 1d compressive strength = 33.3 MPa, and 28d compressive strength = 55.7 MPa.

[0082] 4. The 14-day average carbonization depth of the specimen made of the grouting material in this embodiment was measured to be 12.6 mm using the same method as in Example 1 above.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-flow, early-strength, two-component cement-based grouting material, characterized in that, Component A of the grouting material includes: 100 parts by weight of sulfoaluminate cement, 0.5 to 2.0 parts by weight of composite reinforcing agent, 0.2 to 0.3 parts by weight of powder water-reducing agent, 0.1 to 0.2 parts by weight of defoamer, and 25 to 30 parts by weight of water; Component B of the grouting material includes: 90-95 parts by weight of silicate cement, 3-5 parts by weight of calcium hydroxide, 0.1-0.15 parts by weight of lithium carbonate, 2-3 parts by weight of silica fume, 0.3-0.4 parts by weight of powder water-reducing agent, and 25-28 parts by weight of water. The composite reinforcing agent, by mass percentage, is composed of the following mineral phases: 29.7-51.7% anorthite phase, 26.8-33.1% amorphous borosilicate aluminum-calcium glass phase, 6.7-17.8% anorthite phase, 9.7-15.6% pseudowollastonite phase, and the remainder being silicate heterocrystalline phases and unavoidable impurities.

2. The high-flow, early-strength, two-component cement-based grouting material according to claim 1, characterized in that, The composite reinforcing agent is prepared by the following method: Silicate borosilicate powder, calcium feldspar powder, wollastonite powder and kaolin are mixed and calcined. After the calcination is completed, the calcined product is rapidly cooled to room temperature, crushed and ground to obtain the final product.

3. The high-flow, early-strength, two-component cement-based grouting material according to claim 2, characterized in that, The proportions of each component by mass percentage are as follows: 25-40% for the borosilicate mineral powder, 20-35% for the anorthite mineral powder, 15-25% for the wollastonite mineral powder, and 10-20% for the kaolin.

4. The high-flow, early-strength, two-component cement-based grouting material according to claim 2, characterized in that, The calcination treatment is carried out at a temperature of 1180~1220℃ for 3~3.5 hours.

5. The high-flow, early-strength, two-component cement-based grouting material according to claim 1, characterized in that, The fineness of the composite reinforcing agent is 400-500 mesh.

6. The high-flow, early-strength, two-component cement-based grouting material according to claim 1, characterized in that, The powder water-reducing agent includes at least one of the following: polycarboxylate water-reducing agent, naphthalene-based water-reducing agent, and lignin sulfonate water-reducing agent.

7. The high-flow, early-strength, two-component cement-based grouting material according to claim 1, characterized in that, The composite reinforcing agent is a surface boron-enriched reinforcing agent obtained after boric acid modification.

8. The high-flow, early-strength, two-component cement-based grouting material according to claim 7, characterized in that, The surface boron enrichment reinforcing agent is prepared by the following method: the composite reinforcing agent is mixed with boric acid solution and stirred. After the mixture is completed, the solid product is separated and dried to obtain the final product.

9. The high-flow, early-strength, two-component cement-based grouting material according to claim 8, characterized in that, The mass ratio of the composite reinforcing agent to the boric acid solution is 1:2~5; or, the mass fraction of the boric acid solution is 0.1~0.5%; or, the stirring time is 30~60 min.

10. The application of the high-flowability, early-strength, two-component cement-based grouting material according to any one of claims 1-9 in bridge engineering, road engineering, or marine engineering.

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