A quick-stable high-fluidity grouting material and a preparation method thereof

Abstract

The application belongs to the technical field of building materials, and discloses a high-flow grouting material with rapid stability and a preparation method thereof, raw materials of the high-flow grouting material include component A and component B, in terms of mass fraction, the component A includes: P.O 42.5R Portland cement 400-550 parts, 42.5R low-alkalinity sulphoaluminate cement 100-150 parts, secondary fly ash 10-20 parts, silica fume 3-8 parts, re-dispersible modified emulsion powder 1-3 parts, quartz sand 500-700 parts, polycarboxylic acid water reducer 0.5-1.2 parts, and polyacrylamide 1-3 parts; the component B includes: inorganic-organic composite suspension stabilizer 0.5-1.5 parts, calcium sulphoaluminate expansive agent 2-4 parts, and water 200-250 parts. The application can solve the contradiction between fluidity and stability of the high-flow grouting material.

Description

Technical Field

[0001] This invention belongs to the field of building materials technology, and relates to a fast-stabilizing high-fluidity grout for steel bar connections in prefabricated concrete structures requiring rapid construction, and its preparation method. Specifically, it is a fast-stabilizing high-fluidity grout and its preparation method. Background Technology

[0002] Prefabricated construction is the core direction of modern building industrialization. Among these technologies, grouting connection technology using steel sleeves is crucial for ensuring the safe and reliable stress performance between precast components. With technological advancements, the market has placed higher demands on grouting materials: in ambient temperatures (above 5℃), they not only need extremely high early and late strength to ensure rapid construction and long-term safety, but also excellent fluidity to fill the complex voids within the sleeves, while maintaining superior stability to prevent segregation and bleeding during transportation and grouting. Existing technologies typically employ the following solutions to optimize grouting material performance: First, using a blend of sulfoaluminate cement and silicate cement, leveraging the rapid hydration and micro-expansion characteristics of sulfoaluminate cement to enhance early strength and compensate for shrinkage; second, incorporating mineral admixtures such as fly ash and silica fume to improve the grout's microstructure and enhance its later strength and durability. However, existing technologies still face significant challenges: First, the extensive use of high-efficiency water-reducing agents to achieve high fluidity often results in low slurry viscosity, making aggregates prone to settling and stratification in a static state, or producing a "waterfall effect" in the complex flow path within the sleeve, leading to uneven grouting and reduced local strength. Summary of the Invention

[0003] This invention aims to overcome the shortcomings of the prior art and provide a fast-stable high-fluidity grout and its preparation method. This invention can resolve the contradiction between fluidity and stability in high-fluidity grout.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A fast-stabilizing, high-fluidity grouting material, the raw materials of which include component A and component B, in parts by mass: Component A includes: 400-550 parts of PO 42.5R silicate cement, 100-150 parts of 42.5R low-alkalinity sulfoaluminate cement, 10-20 parts of secondary fly ash, 3-8 parts of silica fume, 1-3 parts of redispersible modified latex powder, 500-700 parts of quartz sand, 0.5-1.2 parts of polycarboxylate superplasticizer, and 1-3 parts of polyacrylamide; Component B includes: 0.5-1.5 parts of inorganic-organic composite suspension stabilizer, 2-4 parts of calcium sulfoaluminate expansion agent, and 200-250 parts of water; The preparation method of the inorganic-organic composite suspension stabilizer includes the following steps: Sodium silicate solution, sodium carboxymethyl cellulose and deionized water were mixed and dissolved to obtain a homogeneous colloidal solution; An aluminum sulfate solution was added to the homogeneous colloidal solution and mixed to react, generating intermediate 1; The silane coupling agent and nonionic surfactant were added to intermediate 1 and mixed and reacted. After the reaction was completed, the mixture was cooled and spray-dried to obtain the inorganic-organic composite suspension stabilizer.

[0005] Preferably, when preparing the inorganic-organic composite suspension stabilizer, the following proportions are used: 29-31 parts sodium silicate solution, 14-16 parts sodium carboxymethyl cellulose and 99-101 parts deionized water are mixed and dissolved at 60-70℃ to obtain a homogeneous colloidal solution. The temperature of the homogeneous colloidal solution is controlled at 40-50℃. Under continuous stirring, 10-20 parts of aluminum sulfate solution are added dropwise to the homogeneous colloidal solution to initiate the formation reaction of aluminum silicate gel, thus obtaining intermediate 1. Add 1-2 parts of silane coupling agent and 0.5-1 parts of nonionic surfactant to intermediate 1, continue to heat and stir for 1-2 hours to mix and react. After the reaction is completed, cool to room temperature and then spray dry to obtain the inorganic-organic composite suspension stabilizer.

[0006] Preferably, the silane coupling agent used is silane coupling agent KH550.

[0007] Preferably, the sodium silicate solution has a modulus of 2.8-3.2 and a concentration of 34%-36%.

[0008] Preferably, the concentration of the aluminum sulfate solution is 9wt%-11wt%.

[0009] Preferably, the nonionic surfactant is an alkylphenol polyoxyethylene ether.

[0010] Preferably, the method for preparing the redispersible modified latex powder includes: Ethylene-vinyl acetate-vinyl tert-carbonate terpolymer was dissolved in the first part of deionized water, and then polyvinyl alcohol and hydroxypropyl methylcellulose were added and stirred evenly to prepare a latex solution. The aminosilane coupling agent is added dropwise to the latex solution. After the addition is complete, the mixture is kept warm and stirred until homogeneous. Then, the second portion of deionized water is added and stirred until homogeneous to obtain the modified emulsion. The sum of the volumes of the first and second portions of deionized water is the total amount of water required to prepare the modified emulsion, and the first portion of deionized water accounts for 50%-60% of this total amount of water. The modified emulsion is spray-dried to prepare the redispersible modified latex powder.

[0011] Preferred method: After adding the ethylene-vinyl acetate-vinyl tert-carbonate terpolymer to the first part of deionized water, stir at 600-800 r / min for 39-41 min to dissolve the ethylene-vinyl acetate-vinyl tert-carbonate terpolymer in the first part of deionized water; after adding polyvinyl alcohol and hydroxypropyl methylcellulose, stir at 800-1000 r / min for 29-31 min to prepare a latex solution; In the latex solution, the mass fraction of ethylene tert-carbonate is 8%-12%, and the molar ratio of ethylene, vinyl acetate, and ethylene tert-carbonate is (8.5-9.5):(4.5-5.5):1; the mass fraction of polyvinyl alcohol is 3%-5%, and the mass fraction of hydroxypropyl methylcellulose is 1%-2%. When adding the aminosilane coupling agent to the latex solution dropwise, the temperature of the latex solution is controlled at 50-60℃, and the dropping time is controlled at 55-65 minutes. After the dropping is completed, the solution is kept warm and stirred for 115-125 minutes to make the system homogeneous. Then, the second part of deionized water is added, and the system is stirred for another 25-35 minutes to make the system homogeneous, thus obtaining the modified emulsion. The mass fraction of the aminosilane coupling agent in the modified emulsion is 15%-30%.

[0012] The present invention also provides a method for preparing the fast-stabilizing high-fluidity grouting material as described above, comprising the following steps: Mix the raw materials of component A thoroughly to prepare component A; Mix the raw materials of component B thoroughly to prepare component B; Component A and component B are mixed evenly to obtain the fast-stable high-fluidity grouting material.

[0013] Preferred method: Mix the raw materials of component A at a speed of 150-200 rpm for 5-8 minutes to prepare component A; Mix the raw materials of component B at a speed of 150-200 rpm for 5-10 minutes to prepare component B; Mix component A and component B at a speed of 150-200 rpm for 5-10 minutes to obtain the fast-stable high-fluidity grouting material.

[0014] The present invention has the following beneficial effects: In this invention, a fast-stable high-fluidity grouting material is produced by using components A and B in a specific ratio. This effectively solves the core problem of the inability to simultaneously achieve fluidity and stability in existing high-fluidity grouting materials. The core improvement lies in the synergistic effect of the inorganic-organic composite suspension stabilizer in component B and the polyacrylamide in component A. This composite suspension stabilizer is prepared by dissolving sodium silicate solution, sodium carboxymethyl cellulose, and deionized water, then adding aluminum sulfate solution to react and generate intermediate 1. A silane coupling agent and a nonionic surfactant are then added, followed by drying. This process forms a three-dimensional network structure with an inorganic aluminum silicate gel as the backbone and long-chain molecules of silane coupling agent and sodium carboxymethyl cellulose coupled and intertwined. Combined with polyacrylamide, this structure can rapidly regulate the stability of the grout system, constructing a weak three-dimensional network structure to impart excellent static suspension ability and moderate thixotropy to the grout. Furthermore, the 1-3 parts of redispersible modified latex powder in component A promote the formation of a single small-scale flocculated structure in the cement unit, further optimizing the network structure. Through molecular isolation and weak adsorption, it completely eliminates slurry bleeding and aggregate settling while ensuring high fluidity. This avoids the low slurry viscosity, aggregate stratification, and "waterfall effect" during sleeve grouting caused by the excessive use of water-reducing agents in the pursuit of high fluidity in existing technologies. The 0.5-1.2 parts of polycarboxylate superplasticizer in component A have good compatibility with the above-mentioned admixture system, which can prevent the fluidity from being lost too quickly over time. Combined with the reasonable gradation of 500-700 parts of quartz sand, cement, and mineral admixtures, the initial fluidity of the slurry can reach more than 320 mm, and the fluidity retention value after 30 minutes is greater than 260 mm, which can smoothly fill the complex gaps in the steel sleeve. 400-550 parts of PO The grout is blended with 100-150 parts of 42.5R low-alkalinity sulfoaluminate cement, balancing the advantages of early strength and later strength. 10-20 parts of secondary fly ash and 3-8 parts of silica fume exert the pozzolanic effect and micro-aggregate filling effect to optimize the microstructure of the grout. Combined with 2-4 parts of calcium sulfoaluminate expansive agent in component B, the grout achieves continuous micro-expansion to compensate for shrinkage and avoid cracking. This results in a grout with a 1-day compressive strength ≥40MPa, a 3-day compressive strength ≥65MPa, and a 28-day compressive strength ≥90MPa, far exceeding the application standards. Furthermore, the redispersible modified latex powder significantly improves the toughness, impact resistance, and bonding strength with the reinforcing steel sleeve of the hardened grout, ensuring reliable connection of precast components. The synergistic effect of the above components enables the grout to achieve a synergistic improvement in fluidity, stability, strength, and toughness, highlighting its technological innovation and practical value. Detailed Implementation

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] The grout of this invention exhibits ultra-high initial fluidity and excellent fluidity retention at room temperature. The grout is uniform, stable, and free from segregation and bleeding, demonstrating good early and later strength development, and continuous micro-expansion properties. The key improvement of this invention lies in the preparation of a high-performance admixture—an inorganic-organic composite suspension stabilizer. Simultaneously, the synergistic effect of this inorganic-organic composite suspension stabilizer and polyacrylamide is utilized to rapidly and effectively regulate the stability of the grout system, thereby fundamentally resolving the contradiction between fluidity and stability in high-fluidity grouts.

[0017] Specifically, the preparation method of the fast-stabilizing high-fluidity grouting material of the present invention includes the following steps: Step A1: Add deionized water (50%-60% of the total water volume, i.e., the first part of deionized water) and the ethylene-vinyl acetate-ethylene tert-carbonate terpolymer emulsion to a high-speed dispersion vessel. Stir at 600-800 r / min for 39-41 min to completely dissolve the ethylene-vinyl acetate-ethylene tert-carbonate terpolymer. Then add polyvinyl alcohol and hydroxypropyl methylcellulose, and stir at 800-1000 r / min for 29-31 min to form a homogeneous latex solution. In the latex solution, the mass fraction of ethylene tert-carbonate is 8%-12%, and the mass fraction of ethylene and acetic acid is... The molar ratio of ethylene ester and ethylene tert-carbonate is (8.5-9.5):(4.5-5.5):1; the mass fraction of polyvinyl alcohol is 3%-5%, and the mass fraction of hydroxypropyl methylcellulose is 1%-2%; the latex solution is heated to 50-60℃, and then aminosilane coupling agent is slowly added dropwise to the latex solution, with the addition time controlled at 1h±5min. After the addition is completed, the solution is kept warm and stirred for 2h±5min, and then the remaining deionized water (i.e., the second part of deionized water) is added, and stirring is continued for 25-35min to obtain the modified emulsion; the mass fraction of aminosilane coupling agent in the modified emulsion is 15%-30%. The modified emulsion is dried using a centrifugal spray dryer, and the dried product is collected by a cyclone separator to obtain the redispersible modified latex powder.

[0018] Step A2: Weigh the following raw materials in parts by weight: 400-550 parts of PO 42.5R silicate cement, 100-150 parts of 42.5R low-alkalinity sulfoaluminate cement, 10-20 parts of secondary fly ash, 3-8 parts of silica fume, 1-3 parts of redispersible modified latex powder, 500-700 parts of quartz sand, 1-3 parts of polyacrylamide, and 0.5-1.2 parts of polycarboxylate-based high-performance water-reducing agent. Add the above materials evenly to a mixer and mix at 150-200 rpm for 5-8 minutes until the materials are uniform in color, thus preparing component A.

[0019] Step A3: Take the following raw materials by weight: 0.5-1.5 parts of inorganic-organic composite suspension stabilizer, 2-4 parts of calcium sulfoaluminate expansion agent, and 200-250 parts of water. Add the above materials evenly to the mixer and mix at a speed of 150-200 rpm for 5-10 minutes to prepare component B. Mix component B with component A at a speed of 150-200 rpm for 5-10 minutes to obtain a fast-stable high-fluidity grout.

[0020] When component A and component B are mixed to prepare a fast-stable, high-fluidity grout, the polycarboxylate-based high-performance water-reducing agent reduces the rapid hydration reaction capacity, allowing the weak three-dimensional network structure constructed by the inorganic-organic composite suspension stabilizer to endow the grout with extremely high static suspension capacity and moderate thixotropy. Subsequently, polyacrylamide promotes the formation of a single, small-scale flocculated structure by small cement units, and redispersible modified latex powder accelerates the small-scale growth of the weak three-dimensional network. Through molecular isolation and weak adsorption effects, bleeding and aggregate settling are completely eliminated, achieving high fluidity while rapidly establishing a flocculated stable system for the grout.

[0021] Furthermore, the preparation process of the inorganic-organic composite suspension stabilizer, by mass parts, includes the following steps: Step B1: Add 29-31 parts of sodium silicate solution, 14-16 parts of sodium carboxymethyl cellulose, and 99-101 parts of deionized water to a reactor equipped with a stirrer and heating device. Stir at 300-500 rpm at 60-70°C until completely dissolved to form a homogeneous colloidal solution. The sodium silicate solution has a modulus of 2.8-3.2 and a concentration of 34%-36%.

[0022] Step B2: Lower the system temperature to 40-50℃ (i.e., cool the homogeneous colloidal solution to 40-50℃). While continuously stirring, add 10-20 parts of aluminum sulfate solution dropwise to the homogeneous colloidal solution over a period of 50 minutes to initiate the formation of aluminum silicate gel, yielding intermediate 1. After the addition is complete, add 1-2 parts of silane coupling agent KH550 and 0.5-1 parts of alkylphenol polyoxyethylene ether to intermediate 1, and continue stirring at the same temperature for 1-2 hours. The alkylphenol polyoxyethylene ether is a nonionic surfactant. The concentration of the aluminum sulfate solution is 9wt%-11wt%. Finally, cool the product to room temperature (e.g., 20-30℃) and spray dry to obtain a white micro / nano-scale powder, thus preparing an inorganic-organic composite suspension stabilizer.

[0023] In the above-described scheme of this invention, the inorganic-organic composite suspension stabilizer uses aluminosilicate inorganic gel as its framework, and forms a three-dimensional network structure through coupling and entanglement of KH550 and CMC-Na long-chain molecules. The polycarboxylate-based high-performance water-reducing agent reduces the rapid hydration reaction, allowing the weak three-dimensional network structure constructed by the inorganic-organic composite suspension stabilizer to impart extremely high static suspension capacity and moderate thixotropy to the slurry. Subsequently, latex powder promotes the formation of a single, small-scale flocculation structure in small cement units, accelerating the gradual growth of the weak three-dimensional network. Through molecular isolation and weak adsorption effects, bleeding and aggregate settling are completely eliminated while maintaining fluidity over time. Experiments show that the initial fluidity of the slurry of this invention can reach over 320 mm, and the fluidity retention value after 30 minutes is greater than 260 mm. Furthermore, the slurry is uniformly mirror-like during flow, with no aggregate sedimentation traces. The silicate-sulfoaluminate composite cement system provides a guarantee for strength development; the pozzolanic effect of fly ash and silica fume, as well as the micro-aggregate filling effect, further optimizes the pore structure of the slurry. This results in a grout with a 1-day compressive strength ≥40MPa, a 3-day compressive strength ≥65MPa, and a 28-day compressive strength ≥90MPa, meeting and far exceeding standard requirements. The addition of redispersible latex powder significantly improves the toughness, impact resistance, and bond strength to rebar sleeves of the hardened grout. The admixture system exhibits excellent compatibility with polycarboxylate superplasticizers, avoiding the common problem of excessively rapid loss of fluidity over time and providing ample time for on-site construction.

[0024] Example 1 The preparation method of the fast-stabilizing high-fluidity grouting material in this embodiment specifically includes the following steps: Step A1: Add deionized water (50% of the total water volume) and the ethylene-vinyl acetate-vinyl tert-carbonate terpolymer emulsion to a high-speed dispersion reactor. Stir at 600 rpm for 40 min to completely dissolve the ethylene-vinyl acetate-vinyl tert-carbonate terpolymer. Then add polyvinyl alcohol and hydroxypropyl methylcellulose and stir at 800 rpm for 30 min to form a homogeneous latex solution. In the latex solution, the mass fraction of ethylene tert-carbonate is 8%, and the molar ratio of ethylene, vinyl acetate, and ethylene tert-carbonate is 9:5:1; the mass fraction of polyvinyl alcohol is 3%, and the mass fraction of hydroxypropyl methylcellulose is 1%. Heat the latex solution to 50°C, and then slowly add an aminosilane coupling agent dropwise over a period of 1 hour. After the addition is complete, keep the solution warm and stir for 2 hours. Then add the remaining deionized water and continue stirring for 30 min to obtain a modified emulsion. The mass fraction of the aminosilane coupling agent in the modified emulsion is 15%. The modified emulsion was dried using a centrifugal spray dryer, and the dried product was collected by a cyclone separator to obtain the redispersible modified latex powder.

[0025] Step A2: Weigh the following raw materials by weight: 400 parts of PO 42.5R silicate cement, 100 parts of 42.5R low-alkalinity sulfoaluminate cement, 10 parts of secondary fly ash, 3 parts of silica fume, 1 part of redispersible modified latex powder, 500 parts of quartz sand, 1 part of polyacrylamide, and 0.5 parts of polycarboxylate-based high-performance water-reducing agent. Add the above materials evenly to a mixer and mix at 150 rpm for 5 minutes until the material is uniform in color, thus preparing component A.

[0026] Step A3: Take the following raw materials by weight: 0.5 parts inorganic-organic composite suspension stabilizer, 2 parts calcium sulfoaluminate expansion agent, and 200 parts water. Add the above materials evenly to the mixer and mix at 150 rpm for 5 minutes to prepare component B. Mix component B with component A and mix at 150 rpm for 5 minutes to obtain a fast-stable high-fluidity grout.

[0027] Furthermore, the preparation process of the inorganic-organic composite suspension stabilizer, by mass parts, includes the following steps: Step B1: Add 30 parts of sodium silicate solution, 15 parts of sodium carboxymethyl cellulose and 100 parts of deionized water to a reaction vessel equipped with a stirring and heating device, and stir at 300 rpm at 60°C until completely dissolved to form a homogeneous colloidal solution. The sodium silicate solution has a modulus of 2.8 and a concentration of 34%.

[0028] Step B2: The system temperature was lowered to 40℃. Under continuous stirring, 10 parts of aluminum sulfate solution were added dropwise to the homogeneous colloidal solution over a period of 50 minutes to initiate the formation of aluminum silicate gel, yielding intermediate 1. After the addition was complete, 1 part of silane coupling agent KH550 and 0.5 parts of alkylphenol polyoxyethylene ether were added to intermediate 1. The mixture was then stirred and kept at this temperature for 1 hour. The alkylphenol polyoxyethylene ether is a nonionic surfactant. The concentration of the aluminum sulfate solution was 9 wt%. Finally, the product was cooled to room temperature and spray-dried to obtain a white micro / nano-scale powder, thus preparing an inorganic-organic composite suspension stabilizer.

[0029] Example 2 The preparation method of the fast-stabilizing high-fluidity grouting material in this embodiment specifically includes the following steps: Step A1: Add deionized water (55% of the total water volume) and the ethylene-vinyl acetate-ethylene tert-carbonate terpolymer emulsion to a high-speed dispersion reactor. Stir at 700 rpm for 41 minutes to completely dissolve the ethylene-vinyl acetate-ethylene tert-carbonate terpolymer. Then add polyvinyl alcohol and hydroxypropyl methylcellulose, and stir at 900 rpm for 31 minutes to form a homogeneous latex solution. In the latex solution, the mass fraction of ethylene tert-carbonate is 10%, and the molar ratio of ethylene, vinyl acetate, and ethylene tert-carbonate is 9.5: 4.5:1; the mass fraction of polyvinyl alcohol is 2.5%, and the mass fraction of hydroxypropyl methylcellulose is 1%; the latex solution is heated to 55°C, and then aminosilane coupling agent is slowly added dropwise to the latex solution over a time of 65 min. After the addition is complete, the solution is kept warm and stirred for 125 min, then the remaining deionized water is added, and stirring is continued for 25 min to obtain the modified latex solution; the mass fraction of aminosilane coupling agent in the modified latex solution is 25%. The modified latex solution is dried using a centrifugal spray dryer, and the dried solution is collected by a cyclone separator to obtain the redispersible modified latex powder.

[0030] Step A2: Weigh the following raw materials by weight: 450 parts of PO 42.5R silicate cement, 125 parts of 42.5R low-alkalinity sulfoaluminate cement, 15 parts of secondary fly ash, 6 parts of silica fume, 2 parts of redispersible modified latex powder, 675 parts of quartz sand, 2 parts of polyacrylamide, and 1.4 parts of polycarboxylate-based high-performance water-reducing agent. Add the above materials evenly to a mixer and mix at 180 rpm for 6 minutes until the materials are uniformly colored, thus preparing component A.

[0031] Step A3: Take the following parts by weight of raw materials: 1 part of inorganic-organic composite suspension stabilizer, 3 parts of calcium sulfoaluminate expansion agent, and 225 parts of water. Add the above materials evenly to the mixer and mix at 200 rpm for 8 minutes to prepare component B. Mix component B and component A evenly and mix at 200 rpm for 8 minutes to obtain a fast-stable high-fluidity grout.

[0032] Furthermore, the preparation process of the inorganic-organic composite suspension stabilizer, by mass parts, includes the following steps: Step B1: Add 31 parts of sodium silicate solution, 14 parts of sodium carboxymethyl cellulose, and 101 parts of deionized water to a reactor equipped with a stirrer and a heating device. Stir at 400 rpm at 65°C until completely dissolved to form a homogeneous colloidal solution. The sodium silicate solution has a modulus of 30 and a concentration of 35%.

[0033] Step B2: The system temperature was lowered to 45℃. Under continuous stirring, 15 parts of aluminum sulfate solution were added dropwise to the homogeneous colloidal solution over a period of 50 minutes to initiate the formation of aluminum silicate gel, yielding intermediate 1. After the addition was complete, 1 part of silane coupling agent KH550 and 0.5 parts of alkylphenol polyoxyethylene ether were added to intermediate 1. The mixture was then stirred and kept at this temperature for 1 hour. The alkylphenol polyoxyethylene ether is a nonionic surfactant. The concentration of the aluminum sulfate solution was 10 wt%. Finally, the product was cooled to room temperature and spray-dried to obtain a white micro / nano-scale powder, thus preparing an inorganic-organic composite suspension stabilizer.

[0034] Example 3 The preparation method of the fast-stabilizing high-fluidity grouting material in this embodiment specifically includes the following steps: Step A1: Add deionized water (60% of the total water volume) and the ethylene-vinyl acetate-ethylene tert-carbonate terpolymer emulsion to a high-speed dispersion reactor. Stir at 800 rpm for 39 minutes to completely dissolve the ethylene-vinyl acetate-ethylene tert-carbonate terpolymer. Then add polyvinyl alcohol and hydroxypropyl methylcellulose, and stir at 1000 rpm for 29 minutes to form a homogeneous latex solution. In the latex solution, the mass fraction of ethylene tert-carbonate is 12%, and the molar ratio of ethylene, vinyl acetate, and ethylene tert-carbonate is 8.5: 5.5:1; the mass fraction of polyvinyl alcohol is 3.5%, and the mass fraction of hydroxypropyl methylcellulose is 1%; the latex solution is heated to 60°C, and then aminosilane coupling agent is slowly added dropwise to the latex solution, with the addition time controlled at 55 min. After the addition is completed, the solution is kept warm and stirred for 115 min, then the remaining deionized water is added, and stirring is continued for 35 min to obtain the modified latex solution; the mass fraction of aminosilane coupling agent in the modified latex solution is 30%. The modified latex solution is dried using a centrifugal spray dryer, and after drying, it is collected by a cyclone separator to obtain the redispersible modified latex powder.

[0035] Step A2: Weigh the following raw materials by weight: 550 parts of PO 42.5R silicate cement, 150 parts of 42.5R low-alkalinity sulfoaluminate cement, 20 parts of secondary fly ash, 8 parts of silica fume, 3 parts of redispersible modified latex powder, 700 parts of quartz sand, 3 parts of polyacrylamide, and 1.2 parts of polycarboxylate-based high-performance water-reducing agent. Add the above materials evenly to a mixer and mix at 200 rpm for 8 minutes to make the materials uniform in color, thus preparing component A.

[0036] Step A3: Take the following raw materials by weight: 1.5 parts inorganic-organic composite suspension stabilizer, 4 parts calcium sulfoaluminate expansion agent, and 250 parts water. Add the above materials evenly to the mixer and mix at 200 rpm for 10 minutes to prepare component B. Mix component B and component A evenly and mix at 200 rpm for 10 minutes to obtain a fast-stable high-fluidity grout.

[0037] Furthermore, the preparation process of the inorganic-organic composite suspension stabilizer, by mass parts, includes the following steps: Step B1: Add 29 parts of sodium silicate solution, 16 parts of sodium carboxymethyl cellulose, and 99 parts of deionized water to a reactor equipped with a stirrer and a heating device. Stir at 500 rpm at 70°C until completely dissolved to form a homogeneous colloidal solution. The sodium silicate solution has a modulus of 3.2 and a concentration of 36%.

[0038] Step B2: The system temperature was lowered to 50℃. Under continuous stirring, 20 parts of aluminum sulfate solution were added dropwise to the homogeneous colloidal solution over a period of 50 minutes to initiate the formation of aluminum silicate gel, yielding intermediate 1. After the addition was complete, 2 parts of silane coupling agent KH550 and 1 part of alkylphenol polyoxyethylene ether were added to intermediate 1. The mixture was then stirred and kept at this temperature for 2 hours. The alkylphenol polyoxyethylene ether is a nonionic surfactant. The concentration of the aluminum sulfate solution was 11 wt%. Finally, the product was cooled to room temperature and spray-dried to obtain a white micro / nano-scale powder, thus preparing an inorganic-organic composite suspension stabilizer.

[0039] Comparative Example 1 Compared with Example 1, this comparative example uses acrylate adhesive powder instead of redispersible modified latex powder, while the other steps are the same.

[0040] Comparative Example 2 Compared with Example 1, this comparative example uses sodium silicate stabilizer instead of inorganic-organic composite suspension stabilizer, while the other steps are the same.

[0041] Grouting materials were prepared using a water-cement ratio of 0.21. The fast-stable high-flowability grouting materials prepared in Examples 1-3 and the grouting materials prepared in Comparative Examples 1-2 were tested for 0-minute and 30-minute flowability according to JC / T 1083-2008, and the bleeding rate was tested according to JG / T 408-2013. 40mm×40mm×160mm specimens were prepared according to GB / T 17671-2021, and the compressive strength was tested. The test results are shown in Table 1.

[0042] Table 1 Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 0 min flowability / mm 325 330 330 315 275 30min flowability / mm 275 280 290 260 235 Perfusion rate 0 0 0 1.2 1.6 1d compressive strength / MPa 47 49 42 37 32 3d compressive strength / MPa 73 68 71 56 51 28-day compressive strength / MPa 101 103 91 87 80 As shown in Table 1, this application exhibits excellent flowability without bleeding, and its mechanical properties meet the requirements. The flowability and mechanical properties data of the Examples at 1d, 3d, and 28d are all greater than those of the Comparative Examples, indicating that the redispersible modified latex powder and the inorganic-organic composite suspension stabilizer improve the uniformity of particle distribution and workability of the grout. Furthermore, no bleeding or segregation was observed in the Examples tests; the grout could quickly re-establish a uniform aggregate distribution system after disturbance, while the Comparative Examples all exhibited bleeding, with bleeding rates as high as 1.2% and 1.6%.

[0043] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A fast-stabilizing, high-fluidity grouting material, characterized in that, Its raw materials include component A and component B, in parts by mass: Component A includes: 400-550 parts of PO 42.5R silicate cement, 100-150 parts of 42.5R low-alkalinity sulfoaluminate cement, 10-20 parts of secondary fly ash, 3-8 parts of silica fume, 1-3 parts of redispersible modified latex powder, 500-700 parts of quartz sand, 0.5-1.2 parts of polycarboxylate superplasticizer, and 1-3 parts of polyacrylamide; Component B includes: 0.5-1.5 parts of inorganic-organic composite suspension stabilizer, 2-4 parts of calcium sulfoaluminate expansion agent, and 200-250 parts of water; The preparation method of the inorganic-organic composite suspension stabilizer includes the following steps: Sodium silicate solution, sodium carboxymethyl cellulose and deionized water were mixed and dissolved to obtain a homogeneous colloidal solution; An aluminum sulfate solution was added to the homogeneous colloidal solution and mixed to react, generating intermediate 1; The silane coupling agent and nonionic surfactant were added to intermediate 1 and mixed and reacted. After the reaction was completed, the mixture was cooled and spray-dried to obtain the inorganic-organic composite suspension stabilizer.

2. The fast-stabilizing, high-fluidity grouting material according to claim 1, characterized in that, Specifically, in preparing the inorganic-organic composite suspension stabilizer, the following proportions are made by mass: 29-31 parts sodium silicate solution, 14-16 parts sodium carboxymethyl cellulose and 99-101 parts deionized water are mixed and dissolved at 60-70℃ to obtain a homogeneous colloidal solution. The temperature of the homogeneous colloidal solution is controlled at 40-50℃. Under continuous stirring, 10-20 parts of aluminum sulfate solution are added dropwise to the homogeneous colloidal solution to initiate the formation reaction of aluminum silicate gel, thus obtaining intermediate 1. Add 1-2 parts of silane coupling agent and 0.5-1 parts of nonionic surfactant to intermediate 1, continue to heat and stir for 1-2 hours to mix and react. After the reaction is completed, cool to room temperature and then spray dry to obtain the inorganic-organic composite suspension stabilizer.

3. A fast-stabilizing, high-fluidity grouting material according to claim 1 or 2, characterized in that, The silane coupling agent used is silane coupling agent KH550.

4. A fast-stabilizing, high-fluidity grouting material according to claim 1 or 2, characterized in that, The sodium silicate solution has a modulus of 2.8-3.2 and a concentration of 34%-36%.

5. A fast-stabilizing, high-fluidity grouting material according to claim 1 or 2, characterized in that, The concentration of the aluminum sulfate solution is 9wt%-11wt%.

6. A fast-stabilizing, high-fluidity grouting material according to claim 1 or 2, characterized in that, The nonionic surfactant is an alkylphenol polyoxyethylene ether.

7. The fast-stabilizing, high-fluidity grouting material according to claim 1, characterized in that, The preparation method of the redispersible modified latex powder includes: Ethylene-vinyl acetate-vinyl tert-carbonate terpolymer was dissolved in the first part of deionized water, and then polyvinyl alcohol and hydroxypropyl methylcellulose were added and stirred evenly to prepare a latex solution. The aminosilane coupling agent is added dropwise to the latex solution. After the addition is complete, the mixture is kept warm and stirred until homogeneous. Then, the second portion of deionized water is added and stirred until homogeneous to obtain the modified emulsion. The sum of the volumes of the first and second portions of deionized water is the total amount of water required to prepare the modified emulsion, and the first portion of deionized water accounts for 50%-60% of this total amount of water. The modified emulsion is spray-dried to prepare the redispersible modified latex powder.

8. The fast-stabilizing, high-fluidity grouting material according to claim 7, characterized in that: After adding the ethylene-vinyl acetate-vinyl tert-carbonate terpolymer to the first part of deionized water, stir at 600-800 r / min for 39-41 min to dissolve the ethylene-vinyl acetate-vinyl tert-carbonate terpolymer in the first part of deionized water. After adding polyvinyl alcohol and hydroxypropyl methylcellulose, stir at 800-1000 r / min for 29-31 min to prepare a latex solution; In the latex solution, the mass fraction of ethylene tert-carbonate is 8%-12%, and the molar ratio of ethylene, vinyl acetate, and ethylene tert-carbonate is (8.5-9.5):(4.5-5.5):1; the mass fraction of polyvinyl alcohol is 3%-5%, and the mass fraction of hydroxypropyl methylcellulose is 1%-2%. When adding the aminosilane coupling agent to the latex solution dropwise, the temperature of the latex solution is controlled at 50-60℃, and the dropping time is controlled at 55-65 minutes. After the dropping is completed, the solution is kept warm and stirred for 115-125 minutes to make the system homogeneous. Then, the second part of deionized water is added, and the system is stirred for another 25-35 minutes to make the system homogeneous, thus obtaining the modified emulsion. The mass fraction of the aminosilane coupling agent in the modified emulsion is 15%-30%.

9. A method for preparing a fast-stable, high-fluidity grouting material according to any one of claims 1-8, characterized in that, The process includes the following: Mix the raw materials of component A thoroughly to prepare component A; Mix the raw materials of component B thoroughly to prepare component B; Component A and component B are mixed evenly to obtain the fast-stable high-fluidity grouting material.

10. The method for preparing a fast-stable, high-fluidity grouting material according to claim 9, characterized in that: Mix the raw materials of component A at a speed of 150-200 rpm for 5-8 minutes to prepare component A; Mix the raw materials of component B at a speed of 150-200 rpm for 5-10 minutes to prepare component B; Mix component A and component B at a speed of 150-200 rpm for 5-10 minutes to obtain the fast-stable high-fluidity grouting material.