Method for activating slag fine powder geopolymer cementitious material

Abstract

The application discloses to the active excitation technical field, specifically is a kind of slag fine powder geopolymer cementitious material's active excitation method, first the original slag fine powder is sent into intelligent sorting equipment, and the slag fine powder of preliminary purification is obtained;Then the slag fine powder of preliminary purification is sent into two-stage ball mill equipment and is ground, is ground after 200 mesh screen, and the slag fine powder of uniform particle size is obtained;Subsequently the slag fine powder of uniform particle size is sent into calcining furnace, and gradient temperature calcination process is used to calcine, and immediately cool to room temperature after calcination ends, and the activated slag fine powder is obtained;Based on this, the application has realized the whole cycle accurate control of geopolymer polymerization reaction process, simultaneously optimizes the early strength development of cementitious material, late structure compactness and working performance, solves the short board problem of comprehensive performance caused by the lack of synergy of single excitation system.

Description

Technical Field

[0001] This invention relates to the field of activation technology, specifically to a method for activating the activity of a polymer cementitious material made from slag fine powder. Background Technology

[0002] As a major product of the deep processing of construction waste, fine powder of construction waste contains the following main components: , The presence of silica-alumina active components provides the basic conditions for use as precursors for geopolymer cementitious materials. Geopolymer cementitious materials are a new type of inorganic cementitious material formed by alkali activation based on silica-alumina raw materials. They have advantages such as low carbon emissions, high strength, and excellent durability, and can effectively replace traditional cement. They have broad application prospects in construction, roads, mine backfilling, and other fields, while also enabling the high-value resource utilization of slag and soil, which aligns with the concept of green development.

[0003] Currently, the activation technology for polymer cementitious materials made from slag fine powder is still in the exploratory stage. In actual operation, there may be problems such as poor synergy of the activation system and poor overall performance of the cementitious material. Specifically, existing activation schemes are mostly simple mixtures of a single activator and slag fine powder, lacking synergistic design of activator components and auxiliary activation methods, and failing to form a complete "pretreatment-activation-strengthening" system. For example, some technologies only use alkali activators for activation without adding auxiliary activation components, resulting in slow early strength development of the cementitious material, a 3-day compressive strength of less than 15 MPa, and problems such as cracking and strength decay in the later stages. Other technologies add auxiliary components, but fail to form a synergistic effect with the alkali activator, instead leading to poor slurry fluidity and increased construction difficulty. Summary of the Invention

[0004] To address the aforementioned technical problems of poor synergy in the activation system and unsatisfactory overall performance of the cementitious material, this invention provides the following technical solution: A method for activating the activity of a polymer cementitious material made from slag fine powder includes the following steps: S1, Pretreatment and activation of fine slag powder: S11, Impurity sorting: The raw slag fine powder is fed into the intelligent sorting equipment to obtain preliminarily purified slag fine powder. S12, Gradient grinding: The preliminarily purified slag fine powder is fed into a two-stage ball mill for grinding. After grinding, it is passed through a 200-mesh sieve to obtain slag fine powder with uniform particle size. S13, Thermal activation treatment: The uniformly sized slag fine powder is fed into the calcining furnace and calcined using a gradient heating calcination process. After calcination, it is immediately cooled to room temperature to obtain activated slag fine powder. S2, Pre-excitation treatment: S21, Preparation of pre-activator: Mix water, sodium hydroxide, sodium silicate, sodium metasilicate, and sodium sulfate to prepare a pre-activator solution, with its alkalinity controlled at 3-5 mol / L; S22, Premixed Activation: The activated slag fine powder and the pre-activator solution are mixed at a mass ratio of 1:0.2-0.3 to obtain the pre-activated slag fine powder slurry; S3, the main activation reaction: S31, Preparation of composite main activator: Sodium hydroxide, sodium silicate, desulfurized gypsum, slag powder, potassium carbonate and water are mixed to prepare composite main activator; S32, Main Activation Mixing: The pre-activated slag fine powder slurry is mixed with the composite main activator at a mass ratio of 1:0.15-0.25, and the water-cement ratio of the system is adjusted to 0.3-0.35 to obtain the main activating slurry; S33, isothermal reaction: The main ignition slurry is sent into an isothermal reaction chamber for reaction to obtain polymer slurry; S4, Assisted Enhancement Activation: S41, Nano-assisted addition: Add nano-alumina to the polymer slurry at a mass fraction of 0.5-1%; S42, Ultrasonic strengthening treatment: The polymer slurry with added nano-alumina is fed into an ultrasonic device for ultrasonic treatment to obtain a strengthened polymer slurry; S5, curing and shaping: S51, Molding: The reinforced polymer slurry is injected into the mold and compacted to obtain the slurry after molding; S52, Initial curing: The molded slurry is placed in an environment with a temperature of 20-25℃ and a relative humidity of ≥90% for initial curing; S53, Re-curing: The sample after initial curing is sent into the curing chamber for re-curing, and finally a high-performance slag fine powder polymer cementitious material is obtained.

[0005] As a preferred embodiment of the activation method for a polymer cementitious material of slag fine powder described in this invention, wherein: the two-stage ball mill in S12 first uses grinding balls of φ10-15mm for coarse grinding for 10-15min, and then uses grinding balls of φ5-8mm for fine grinding for 15-25min.

[0006] As a preferred embodiment of the activation method for the polymer cementitious material of slag fine powder described in this invention, wherein: in the gradient heating calcination process in S13, the temperature is first raised to 450-500℃ at a rate of 3-5℃ / min and held at that temperature for 30min, and then raised to 700-750℃ at a rate of 5-8℃ / min and held at that temperature for calcination for 60-80min.

[0007] As a preferred embodiment of the activation method for a polymer cementitious material for fine soil powder according to the present invention, the pre-activator solution in S21 comprises, by weight: 8-12 parts water, 3-5 parts sodium hydroxide, 2-4 parts sodium silicate, 0.8-1.2 parts sodium metasilicate, and 0.5-1.0 parts sodium sulfate.

[0008] As a preferred embodiment of the activation method for the polymer cementitious material of slag fine powder described in this invention, wherein: the mixing time in S22 is set to 20-30 min, and the mixing speed is set to 200-300 r / min.

[0009] As a preferred embodiment of the activation method for the polymer cementitious material of slag fine powder described in this invention, the composite main activator raw materials in S31 include, by weight: 1-2 parts sodium hydroxide, 3-5 parts sodium silicate, 0.5-1 parts desulfurized gypsum, 2-4 parts slag powder, 0.5-1 parts potassium carbonate, and 4-6 parts water.

[0010] As a preferred embodiment of the activation method for the polymer cementitious material of slag fine powder described in this invention, wherein: the mixing time in S32 is set to 40-60 min, and the mixing speed is set to 500-600 r / min.

[0011] As a preferred embodiment of the activation method for the polymer cementitious material of slag fine powder described in this invention, wherein the temperature of the constant temperature reaction chamber in S33 is set to 60-70℃ and the reaction time is set to 2-3h.

[0012] As a preferred embodiment of the activation method for the polymer cementitious material of slag fine powder described in this invention, wherein: the nano-alumina particle size in S41 is set to 50-100nm; the ultrasonic power in S42 is set to 300-400W, the ultrasonic frequency is set to 20-30kHz, and the ultrasonic time is set to 15-20min.

[0013] As a preferred embodiment of the activation method for the polymer cementitious material of slag fine powder described in this invention, wherein: the compaction time in S51 is set to 5-10 min; the initial curing time in S52 is set to 24-48 h; and the re-curing temperature in S53 is set to 40-50℃, the relative humidity is ≥85%, and the time is set to 7-14 d.

[0014] Compared with existing technologies: 1. Through the synergistic effect of gradient thermal activation pretreatment and graded progressive activation process, the lattice structure of stable crystalline silicon-aluminum minerals in slag fine powder is destroyed in a targeted manner, and inert silicon-oxygen bonds and aluminum-oxygen bonds are continuously broken. This enables the full dissolution and efficient polymerization utilization of potential active silicon-aluminum components in slag fine powder, and fundamentally solves the problems of insufficient activation and low effective utilization rate of slag fine powder.

[0015] 2. By designing a synergistic excitation system that integrates pre-excitation, main excitation, and auxiliary enhancement, and matching the compatibility and synergistic ratio of alkali-excitation components, sulfate-excitation components, and nano-auxiliary components, the system can achieve precise full-cycle control of the geopolymer polymerization process, simultaneously optimize the early strength development, later structural compactness, and workability of the cementitious material, and solve the problem of insufficient synergy in a single excitation system that leads to shortcomings in overall performance. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below.

[0017] Example 1: This invention provides a method for activating the activity of a polymer cementitious material made from slag fine powder, comprising the following steps: S1, Pretreatment and activation of fine slag powder: S11, Impurity sorting: The raw slag fine powder is fed into the intelligent sorting equipment. Through AI visual recognition combined with wind and water separation processes, lightweight impurities such as wood, plastic, and metal, as well as large particle impurities, are removed to obtain preliminarily purified slag fine powder. S12, Gradient grinding: The pre-purified slag fine powder is fed into a two-stage ball mill for grinding. After grinding, it is passed through a 200-mesh sieve to obtain slag fine powder with uniform particle size. The two-stage ball mill first uses φ10mm grinding balls for coarse grinding for 10 minutes, and then uses φ5mm grinding balls for fine grinding for 15 minutes. S13, Thermal Activation Treatment: Uniformly sized slag fine powder is fed into a calcining furnace and calcined using a gradient heating calcination process. After calcination, it is immediately cooled to room temperature. The thermal shock breaks down the crystalline structure of the silica-alumina minerals, transforming the crystalline silica-alumina into an amorphous phase, thus obtaining activated slag fine powder. Specifically, the gradient heating calcination process first raises the temperature to 450℃ at a rate of 3℃ / min and holds it at that temperature for 30min, then raises the temperature to 700℃ at a rate of 5℃ / min and holds it at that temperature for 60min. S2, Pre-excitation treatment: S21, Preparation of pre-activator: Water, sodium hydroxide, sodium silicate, sodium metasilicate, and sodium sulfate are mixed to prepare a pre-activator solution, with its alkalinity controlled at 3 mol / L to avoid interference from high alkalinity on subsequent main activation; sodium metasilicate can help adjust the solution modulus and improve the dissolution efficiency of silicon components, while sodium sulfate can serve as an auxiliary activation component to initially promote the precipitation of silicon and aluminum ions, synergistically enhancing the pre-activation effect with the original components; the raw materials of the pre-activator solution include, by weight: 8 parts water, 3 parts sodium hydroxide, 2 parts sodium silicate, 0.8 parts sodium metasilicate, and 0.5 parts sodium sulfate; S22, Premixed Activation: The activated slag fine powder and the pre-activator solution are mixed at a mass ratio of 1:0.2, so that the pre-activator solution fully wets the activated slag fine powder, and initially breaks the silicon-oxygen bonds and aluminum-oxygen bonds to obtain the pre-activated slag fine powder slurry; wherein, the mixing time is set to 20 min and the mixing speed is set to 200 r / min. S3, the main activation reaction: S31, Preparation of Composite Primary Activator: Sodium hydroxide, sodium silicate, desulfurized gypsum, slag powder, potassium carbonate, and water are mixed to prepare the composite primary activator; wherein, desulfurized gypsum provides a sulfate environment, promotes the formation of ettringite, and enhances the strength of cementitious materials; slag powder can supplement active silica-alumina components and form a synergistic activation effect with fine slag powder; potassium carbonate can optimize the stability of the alkali activation system and improve the sufficiency of the polymerization reaction; wherein, the raw materials of the composite primary activator include, by weight: 1 part sodium hydroxide, 3 parts sodium silicate, 0.5 parts desulfurized gypsum, 2 parts slag powder, 0.5 parts potassium carbonate, and 4 parts water; S32, Main Activation Mixing: Mix the pre-activated slag fine powder slurry with the composite main activator at a mass ratio of 1:0.15, and adjust the water-cement ratio of the system to 0.3 to ensure that the composite main activator and the pre-activated slag fine powder react fully and promote [the reaction]. , A large amount of ions are precipitated and initially polymerized to obtain the main excitation slurry; the mixing time is set to 40 min and the mixing speed is set to 500 r / min. S33, isothermal reaction: The main stimulating slurry is fed into an isothermal reaction chamber to accelerate the polymerization process, form a preliminary three-dimensional network gel structure, and obtain the polymerized slurry; wherein, the temperature of the isothermal reaction chamber is set to 60℃ and the reaction time is set to 2h. S4, Assisted Enhancement Activation: S41, Nano-assisted addition: Add nano-alumina to the polymer slurry at a mass fraction of 0.5%. Nano-alumina acts as a nucleating agent, which can accelerate the formation of polymer gel and optimize the microstructure. The nano-alumina particle size is set to 50 nm. The ultrasonic power in S42 is set to 300 W, the ultrasonic frequency is set to 20 kHz, and the ultrasonic time is set to 15 min. S42, Ultrasonic Enhancement Treatment: The polymer slurry with added nano-alumina is fed into an ultrasonic device for ultrasonic treatment to break the bubbles generated during the polymerization process through ultrasonic vibration, promote uniform gel growth, and accelerate the diffusion and polymerization of silicon and aluminum ions to obtain an enhanced polymer slurry. S5, curing and shaping: S51, Molding: The reinforced polymer slurry is injected into the mold and compacted to remove residual air bubbles in the slurry and ensure that the molding is dense, thus obtaining the molded slurry; wherein, the compaction time is set to 5 minutes; S52, Initial curing: The molded slurry is placed in an environment with a temperature of 20℃ and a relative humidity of ≥90% for initial curing to allow the three-dimensional network gel structure to stabilize initially; the initial curing time is set to 24h. S53, Re-curing: The sample after initial curing is sent into a curing chamber for re-curing to promote the full progress of the polymerization reaction, make the gel structure more compact, and finally obtain a high-performance slag fine powder polymer cementitious material. The re-curing temperature is set at 40℃, the relative humidity is ≥85%, and the time is set at 7 days.

[0018] Example 2: This invention provides a method for activating the activity of a polymer cementitious material made from slag fine powder, comprising the following steps: S1, Pretreatment and activation of fine slag powder: S11, Impurity sorting: The raw slag fine powder is fed into the intelligent sorting equipment. Through AI visual recognition combined with wind and water separation processes, lightweight impurities such as wood, plastic, and metal, as well as large particle impurities, are removed to obtain preliminarily purified slag fine powder. S12, Gradient grinding: The pre-purified slag fine powder is fed into a two-stage ball mill for grinding. After grinding, it is passed through a 200-mesh sieve to obtain slag fine powder with uniform particle size. The two-stage ball mill first uses φ12.5mm grinding balls for coarse grinding for 12.5min, and then uses φ6.5mm grinding balls for fine grinding for 20min. S13, Thermal Activation Treatment: Uniformly sized slag fine powder is fed into a calcining furnace and calcined using a gradient heating calcination process. After calcination, it is immediately cooled to room temperature. The thermal shock breaks down the crystalline structure of the silica-alumina minerals, transforming the crystalline silica-alumina into an amorphous phase, thus obtaining activated slag fine powder. Specifically, the gradient heating calcination process first raises the temperature to 475℃ at a rate of 4℃ / min and holds it at that temperature for 30min, then raises the temperature to 725℃ at a rate of 6.5℃ / min and holds it at that temperature for 70min. S2, Pre-excitation treatment: S21, Preparation of pre-activator: Water, sodium hydroxide, sodium silicate, sodium metasilicate, and sodium sulfate are mixed to prepare a pre-activator solution, with its alkalinity controlled at 4 mol / L to avoid interference from high alkalinity on subsequent main activation; sodium metasilicate can help adjust the solution modulus and improve the dissolution efficiency of silicon components, while sodium sulfate can serve as an auxiliary activation component to initially promote the precipitation of silicon and aluminum ions, synergistically enhancing the pre-activation effect with the original components; the raw materials of the pre-activator solution include, by weight: 10 parts water, 4 parts sodium hydroxide, 3 parts sodium silicate, 1.0 part sodium metasilicate, and 0.75 parts sodium sulfate; S22, Premixed Activation: The activated slag fine powder and the pre-activator solution are mixed at a mass ratio of 1:0.25, so that the pre-activator solution fully wets the activated slag fine powder, and initially breaks the silicon-oxygen bonds and aluminum-oxygen bonds to obtain the pre-activated slag fine powder slurry; wherein, the mixing time is set to 25 min and the mixing speed is set to 250 r / min. S3, the main activation reaction: S31, Preparation of Composite Primary Activator: Sodium hydroxide, sodium silicate, desulfurized gypsum, slag powder, potassium carbonate, and water are mixed to form a composite primary activator. The desulfurized gypsum provides a sulfate environment, promoting the formation of ettringite and enhancing the strength of cementitious materials. The slag powder supplements the active silica-alumina components, forming a synergistic activation effect with the fine slag powder. Potassium carbonate optimizes the stability of the alkali activation system and improves the sufficiency of the polymerization reaction. The raw materials for the composite primary activator, by weight, include: 1.5 parts sodium hydroxide, 4 parts sodium silicate, 0.75 parts desulfurized gypsum, 3 parts slag powder, 0.75 parts potassium carbonate, and 5 parts water. S32, Main Activation Mixing: The pre-activated slag fine powder slurry is mixed with the composite main activator at a mass ratio of 1:0.2, and the water-cement ratio of the system is adjusted to 0.325 to ensure that the composite main activator and the pre-activated slag fine powder react fully and promote the reaction. , A large amount of ions are precipitated and initially polymerized to obtain the main excitation slurry; the mixing time is set to 50 min and the mixing speed is set to 550 r / min. S33, isothermal reaction: The main stimulating slurry is fed into an isothermal reaction chamber to accelerate the polymerization process, form a preliminary three-dimensional network gel structure, and obtain the polymerized slurry; wherein, the temperature of the isothermal reaction chamber is set to 65℃ and the reaction time is set to 2.5h. S4, Assisted Enhancement Activation: S41, Nano-assisted addition: Add nano-alumina to the polymer slurry at a mass fraction of 0.75%. Nano-alumina acts as a nucleating agent, which can accelerate the formation of polymer gel and optimize the microstructure. The nano-alumina particle size is set to 75nm. In S42, the ultrasonic power is set to 350W, the ultrasonic frequency is set to 25kHz, and the ultrasonic time is set to 17.5min. S42, Ultrasonic Enhancement Treatment: The polymer slurry with added nano-alumina is fed into an ultrasonic device for ultrasonic treatment to break the bubbles generated during the polymerization process through ultrasonic vibration, promote uniform gel growth, and accelerate the diffusion and polymerization of silicon and aluminum ions to obtain an enhanced polymer slurry. S5, curing and shaping: S51, Molding: The reinforced polymer slurry is injected into the mold and compacted to remove residual air bubbles in the slurry and ensure that the molding is dense, thus obtaining the molded slurry; wherein, the compaction time is set to 7.5 min; S52, Initial curing: The molded slurry is placed in an environment with a temperature of 22.5℃ and a relative humidity of ≥90% for initial curing to allow the three-dimensional network gel structure to stabilize initially; the initial curing time is set to 36h. S53, Re-curing: The sample after initial curing is sent to a curing chamber for re-curing to promote the full progress of the polymerization reaction, make the gel structure more compact, and finally obtain a high-performance slag fine powder polymer cementitious material. The re-curing temperature is set at 45℃, the relative humidity is ≥85%, and the time is set at 10.5d.

[0019] Example 3: This invention provides a method for activating the activity of a polymer cementitious material made from slag fine powder, comprising the following steps: S1, Pretreatment and activation of fine slag powder: S11, Impurity sorting: The raw slag fine powder is fed into the intelligent sorting equipment. Through AI visual recognition combined with wind and water separation processes, lightweight impurities such as wood, plastic, and metal, as well as large particle impurities, are removed to obtain preliminarily purified slag fine powder. S12, Gradient grinding: The pre-purified slag fine powder is fed into a two-stage ball mill for grinding. After grinding, it is passed through a 200-mesh sieve to obtain slag fine powder with uniform particle size. The two-stage ball mill first uses φ15mm grinding balls for coarse grinding for 15 minutes, and then uses φ8mm grinding balls for fine grinding for 25 minutes. S13, Thermal Activation Treatment: Uniformly sized slag fine powder is fed into a calcining furnace and calcined using a gradient heating calcination process. After calcination, it is immediately cooled to room temperature. The thermal shock breaks down the crystalline structure of the silica-alumina minerals, transforming the crystalline silica-alumina into an amorphous phase, thus obtaining activated slag fine powder. Specifically, the gradient heating calcination process first raises the temperature to 500℃ at a rate of 5℃ / min and holds it at that temperature for 30min, then raises the temperature to 750℃ at a rate of 8℃ / min and holds it at that temperature for 80min. S2, Pre-excitation treatment: S21, Preparation of pre-activator: Water, sodium hydroxide, sodium silicate, sodium metasilicate, and sodium sulfate are mixed to prepare a pre-activator solution, with its alkalinity controlled at 5 mol / L to avoid interference from high alkalinity on subsequent main activation; sodium metasilicate can help adjust the solution modulus and improve the dissolution efficiency of silicon components, while sodium sulfate can serve as an auxiliary activation component to initially promote the precipitation of silicon and aluminum ions, synergistically enhancing the pre-activation effect with the original components; the raw materials of the pre-activator solution include, by weight: 12 parts water, 5 parts sodium hydroxide, 4 parts sodium silicate, 1.2 parts sodium metasilicate, and 1.0 part sodium sulfate; S22, Premixed Activation: The activated slag fine powder and the pre-activator solution are mixed at a mass ratio of 1:0.3, so that the pre-activator solution fully wets the activated slag fine powder, and initially breaks the silicon-oxygen bonds and aluminum-oxygen bonds to obtain the pre-activated slag fine powder slurry; wherein, the mixing time is set to 30 min and the mixing speed is set to 300 r / min. S3, the main activation reaction: S31, Preparation of Composite Primary Activator: Sodium hydroxide, sodium silicate, desulfurized gypsum, slag powder, potassium carbonate, and water are mixed to prepare the composite primary activator; wherein, desulfurized gypsum provides a sulfate environment, promotes the formation of ettringite, and enhances the strength of cementitious materials; slag powder can supplement active silica-alumina components and form a synergistic activation effect with slag fine powder; potassium carbonate can optimize the stability of the alkali activation system and improve the sufficiency of the polymerization reaction; wherein, the raw materials of the composite primary activator include, by weight: 2 parts sodium hydroxide, 5 parts sodium silicate, 1 part desulfurized gypsum, 4 parts slag powder, 1 part potassium carbonate, and 6 parts water; S32, Main Activation Mixing: The pre-activated slag fine powder slurry is mixed with the composite main activator at a mass ratio of 1:0.25. The water-cement ratio of the system is adjusted to 0.35 to ensure that the composite main activator and the pre-activated slag fine powder react fully and promote [the reaction]. , A large amount of ions are precipitated and initially polymerized to obtain the main excitation slurry; the mixing time is set to 60 min and the mixing speed is set to 600 r / min. S33, isothermal reaction: The main stimulating slurry is fed into an isothermal reaction chamber to accelerate the polymerization process, form a preliminary three-dimensional network gel structure, and obtain the polymerized slurry; wherein, the temperature of the isothermal reaction chamber is set to 70℃ and the reaction time is set to 3h. S4, Assisted Enhancement Activation: S41, Nano-assisted addition: Add 1% by mass of nano-alumina to the polymer slurry. Nano-alumina acts as a nucleating agent, which can accelerate the formation of polymer gel and optimize the microstructure. The nano-alumina particle size is set to 100nm. The ultrasonic power in S42 is set to 400W, the ultrasonic frequency is set to 30kHz, and the ultrasonic time is set to 20min. S42, Ultrasonic Enhancement Treatment: The polymer slurry with added nano-alumina is fed into an ultrasonic device for ultrasonic treatment to break the bubbles generated during the polymerization process through ultrasonic vibration, promote uniform gel growth, and accelerate the diffusion and polymerization of silicon and aluminum ions to obtain an enhanced polymer slurry. S5, curing and shaping: S51, Molding: The reinforced polymer slurry is injected into the mold and compacted to remove residual air bubbles in the slurry and ensure that the molding is dense, thus obtaining the molded slurry; wherein, the compaction time is set to 10 minutes; S52, Initial curing: The molded slurry is placed in an environment with a temperature of 25℃ and a relative humidity of ≥90% for initial curing to allow the three-dimensional network gel structure to stabilize initially; the initial curing time is set to 48h. S53, Re-curing: The sample after initial curing is sent into a curing chamber for re-curing to promote the full progress of the polymerization reaction, make the gel structure more compact, and finally obtain a high-performance slag fine powder polymer cementitious material. The re-curing temperature is set at 50℃, the relative humidity is ≥85%, and the time is set at 14d.

[0020] The following data were obtained by comparing the activity activation methods performed in Examples 1-3 above: 3D compressive strength 37.2MPa 38.6MPa 38.1MPa 28-day compressive strength 56.1MPa 57.2MPa 56.8MPa 28-day shrinkage rate 0.057% 0.042% 0.059%

[0021] As can be seen from the table above, the activation methods performed in Examples 1-3 all showed good performance in terms of 3d compressive strength, 28d compressive strength, and 28d shrinkage rate. After use, Example 2 showed the best results.

[0022] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for activating the activity of a polymer cementitious material made from slag fine powder, characterized in that, Includes the following steps: S1, Pretreatment and activation of fine slag powder: S11, Impurity sorting: The raw slag fine powder is fed into the intelligent sorting equipment to obtain preliminarily purified slag fine powder. S12, Gradient grinding: The preliminarily purified slag fine powder is fed into a two-stage ball mill for grinding. After grinding, it is passed through a 200-mesh sieve to obtain slag fine powder with uniform particle size. S13, Thermal activation treatment: The uniformly sized slag fine powder is fed into the calcining furnace and calcined using a gradient heating calcination process. After calcination, it is immediately cooled to room temperature to obtain activated slag fine powder. S2, Pre-excitation treatment: S21, Preparation of pre-activator: Mix water, sodium hydroxide, sodium silicate, sodium metasilicate, and sodium sulfate to prepare a pre-activator solution, with its alkalinity controlled at 3-5 mol / L; S22, Premixed Activation: The activated slag fine powder and the pre-activator solution are mixed at a mass ratio of 1:0.2-0.3 to obtain the pre-activated slag fine powder slurry; S3, the main activation reaction: S31, Preparation of composite main activator: Sodium hydroxide, sodium silicate, desulfurized gypsum, slag powder, potassium carbonate and water are mixed to prepare composite main activator; S32, Main Activation Mixing: The pre-activated slag fine powder slurry is mixed with the composite main activator at a mass ratio of 1:0.15-0.25, and the water-cement ratio of the system is adjusted to 0.3-0.35 to obtain the main activating slurry; S33, isothermal reaction: The main ignition slurry is sent into an isothermal reaction chamber for reaction to obtain polymer slurry; S4, Assisted Enhancement Activation: S41, Nano-assisted addition: Add nano-alumina to the polymer slurry at a mass fraction of 0.5-1%; S42, Ultrasonic strengthening treatment: The polymer slurry with added nano-alumina is fed into an ultrasonic device for ultrasonic treatment to obtain a strengthened polymer slurry; S5, curing and shaping: S51, Molding: The reinforced polymer slurry is injected into the mold and compacted to obtain the slurry after molding; S52, Initial curing: The molded slurry is placed in an environment with a temperature of 20-25℃ and a relative humidity of ≥90% for initial curing; S53, Re-curing: The sample after initial curing is sent into the curing chamber for re-curing, and finally a high-performance slag fine powder polymer cementitious material is obtained.

2. The method for activating the activity of a polymer cementitious material made from fine slag powder according to claim 1, characterized in that, The two-stage ball mill in S12 first uses φ10-15mm grinding balls for coarse grinding for 10-15 minutes, and then uses φ5-8mm grinding balls for fine grinding for 15-25 minutes.

3. The method for activating the activity of a polymer cementitious material made from fine slag powder according to claim 1, characterized in that, In the gradient heating calcination process described in S13, the temperature is first raised to 450-500℃ at a rate of 3-5℃ / min and held at that temperature for 30min, and then raised to 700-750℃ at a rate of 5-8℃ / min and held at that temperature for calcination for 60-80min.

4. The method for activating the activity of a polymer cementitious material for slag fine powder according to claim 1, characterized in that, The pre-activator solution raw materials in S21 include, by weight: 8-12 parts water, 3-5 parts sodium hydroxide, 2-4 parts sodium silicate, 0.8-1.2 parts sodium metasilicate, and 0.5-1.0 parts sodium sulfate.

5. The method for activating the activity of a polymer cementitious material made from fine slag powder according to claim 1, characterized in that, The mixing time in S22 is set to 20-30 min, and the mixing speed is set to 200-300 r / min.

6. The method for activating the activity of a polymer cementitious material made from fine slag powder according to claim 1, characterized in that, The composite main activator raw materials in S31 include, by weight, 1-2 parts sodium hydroxide, 3-5 parts sodium silicate, 0.5-1 part desulfurized gypsum, 2-4 parts slag powder, 0.5-1 part potassium carbonate, and 4-6 parts water.

7. The method for activating the activity of a polymer cementitious material for slag fine powder according to claim 1, characterized in that, The mixing time in S32 is set to 40-60 min, and the mixing speed is set to 500-600 r / min.

8. The method for activating the activity of a polymer cementitious material for slag fine powder according to claim 1, characterized in that, The temperature of the constant temperature reaction chamber in S33 is set to 60-70℃, and the reaction time is set to 2-3h.

9. The method for activating the activity of a polymer cementitious material made from fine slag powder according to claim 1, characterized in that, The nano-alumina particle size in S41 is set to 50-100nm; the ultrasonic power in S42 is set to 300-400W, the ultrasonic frequency is set to 20-30kHz, and the ultrasonic time is set to 15-20min.

10. The method for activating the activity of a polymer cementitious material made from fine slag powder according to claim 1, characterized in that, The compaction time in S51 is set to 5-10 min; the initial curing time in S52 is set to 24-48 h; and the re-curing temperature in S53 is set to 40-50℃, relative humidity ≥85%, and time is set to 7-14 d.