Preparation method of cement additive

Abstract

The invention relates to a preparation method of a cement additive, which comprises the following steps: S1, selecting a mineral supplement, ultrafine powder, an anti-cracking agent, a reinforcing agent, a stabilizer and a moisture regulator according to a set proportion; uniformly mixing the mineral supplement, the superfine powder, the anti-cracking agent and the reinforcing agent; adding a stabilizer and a moisture regulator, and uniformly mixing; excessive moisture is removed in a vacuum drying mode; and carrying out particle size analysis on the treated cement additive. By optimizing the proportion of the mineral supplement, the superfine powder, the anti-cracking agent, the reinforcing agent, the stabilizer and the moisture regulator, the strength, the crack resistance, the impermeability and the fluidity of cement are improved, the compactness and the strength of the cement are improved by the nano-scale silicon dioxide and the calcium carbonate, the crack resistance and the toughness are improved by the anti-cracking agent and the reinforcing agent, the fluidity is improved by the stabilizer, and the strength of the cement is improved by the superfine powder. And the quality and uniformity of the cement additive are optimized by adopting vacuum drying and particle size analysis, so that the construction quality is improved, and the service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of cement preparation, and more specifically to a method for preparing a cement additive. Background Technology

[0002] With the development of the construction industry, cement, as one of the most basic and commonly used materials in construction and engineering, plays an irreplaceable role. However, traditional cement has some problems in actual use, such as poor crack resistance, insufficient impermeability, and low strength. These problems affect the final performance of cement during the hardening process, thereby affecting the service life and safety of buildings. In order to solve these problems, researchers have been developing and optimizing cement additives to improve the comprehensive performance of cement, especially to enhance its crack resistance, impermeability, and strength. Cement additives, as auxiliary substances added to cement, can improve its performance by improving the microstructure of cement. There are many types of cement additives, which usually include mineral supplements, ultrafine powders, crack-resistant agents, reinforcing agents, stabilizers, and moisture regulators. The ratio and performance of these components play a crucial role in the final performance of cement.

[0003] To meet the higher performance requirements of modern construction, a method for preparing cement additives has been proposed in the prior art. This method aims to improve the crack resistance, impermeability, and strength of cement by optimizing the chemical reaction process of cement. Through reasonable formulation and preparation methods, high-performance cement additives that meet the needs of modern construction can be produced. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A method for preparing a cement additive, comprising: 20-40 parts of mineral supplement, 15-30 parts of ultrafine powder, 5-15 parts of crack-resistant agent, 10-20 parts of reinforcing agent, 5-10 parts of stabilizer and 5-10 parts of moisture regulator.

[0006] Preferably, the mineral supplement includes gypsum, talc, and silica fume, which optimize the chemical reaction process of cement and improve cement strength. The ultrafine powder is either nano-sized silica or calcium carbonate powder, which improves the density of cement and enhances its impermeability.

[0007] Preferably, the crack-resistant agent is a polymer material that inhibits cracks generated during the hardening process of cement and improves the crack resistance of cement. The reinforcing agent is one of cellulose, polypropylene fiber, and polyethylene fiber, which enhances the tensile strength and toughness of cement. The stabilizer is one of natural polymer, glycerol, and mannitol, which regulates the fluidity of cement and ensures the stability of cement during use. The moisture regulator is one of hydrated calcium silicate, gypsum, and mineral powder, which regulates the hydration process of cement and reduces cracks that occur during the drying process of cement.

[0008] Preferably, the preparation steps include: S1. Select mineral supplements, ultrafine powders, crack-resistant agents, reinforcing agents, stabilizers, and moisture regulators according to the set ratio; S2. Mix the mineral supplement, ultrafine powder, crack-resistant agent, and reinforcing agent evenly to ensure the stable distribution of each component; S3. Add stabilizer and moisture regulator, mix evenly, and use high-shear mixing equipment to improve the mixing effect; S4. Excess moisture is removed by vacuum drying to ensure the stability and effectiveness of cement additives; S5. Perform particle size analysis on the treated cement additives to ensure that the particle size distribution is uniform and meets the requirements for cement use.

[0009] Preferably, S2 specifically includes: Mineral supplements and ultrafine powders are pre-screened using a 60-mesh sieve to remove particles and impurities, ensuring that the raw materials entering the mixing process have uniform particle size. A planetary mixer is used to cause particles to collide and shear at high speed in the equipment, increasing the interaction force between particles. An electrostatic mixing device is used to reduce the adhesion and agglomeration of particles. According to the preset ratio, the mineral supplement, ultrafine powder, crack-resistant agent and reinforcing agent are added to the mixing equipment one by one. The mineral supplement and ultrafine powder are used as the base components and are added to the mixer first, followed by the crack-resistant agent and reinforcing agent. During the mixing process, electrostatic dispersion technology is introduced, and the electric field strength is set to make the particle surface charged, reducing electrostatic adsorption between particles and preventing the material from agglomerating during the mixing process.

[0010] Preferably, S3 specifically includes: Add stabilizers and moisture regulators to the mixing equipment to adjust the humidity of the materials; Set the initial mixing speed to 300-500 rpm for dry mixing to allow all powder components to come into initial contact and form a preliminary uniform mixture, and continue for 2-5 minutes. Adjust the mixing speed to 1500-3000 rpm for vigorous mixing, and continue this process for 5-10 minutes to ensure that all ingredients are fully combined.

[0011] Preferably, S4 specifically includes: Before vacuum drying, the cement additives are first screened. If there are lumps in the additives, they are initially crushed and loosened. Check the working status of the vacuum pump and the temperature control system. Based on the properties and requirements of the cement additives, set the drying temperature between 50°C and 80°C, and set the vacuum level to -0.08 to -0.1 MPa to lower the boiling point of water evaporation. Place the prepared cement additive in the vacuum drying tray, start the vacuum pump, reduce the internal pressure to the set vacuum level, and heat the material through the heating system. Observe the pressure and temperature changes in the equipment to ensure that the temperature remains stable within the set range throughout the process. During the drying process, the temperature, vacuum level, and material condition of the equipment are monitored regularly. When the moisture content in the cement additive reaches the predetermined standard, stop the vacuum pump, restore the environment to normal pressure, remove the dried cement additive from the drying equipment, and allow it to cool naturally at room temperature.

[0012] Preferably, S5 specifically includes: Cement additives with particles larger than 0.075 mm were analyzed by sieving using standard sieves. Cement additives with particles ranging from 0.1 µm to 2000 µm were analyzed by laser particle size analyzer. For particles smaller than 0.1 µm, particle size analysis was performed by laser scattering. According to the standard requirements for cement, check whether the particle size distribution of cement additives meets the requirements. If the particle size distribution does not meet the requirements for cement use, optimize it by further crushing and by adjusting the screen aperture and time in the screening process. Record the process, results, and optimization measures of granularity analysis.

[0013] Preferably, the particle size analysis specifically includes: The sieving method involves the following steps: Prepare a set of standard sieves with mesh sizes arranged from largest to smallest: 4.75mm, 2mm, 1mm, 0.5mm, 0.25mm, and 0.1mm. Place the cement additive sample evenly on the sieve mesh. Placed in a screening machine, the material particles are separated into layers according to their size through vibration screening; Vibrate for 5-10 minutes during each sieving process to ensure that the particles are fully sieved. Weigh the material on each screen and record the weight of each layer; The percentage content of different particle size ranges is calculated based on the sieving results, and the particle size distribution curve is obtained. The operation steps of laser particle size analysis are as follows: Dilute the sample to a concentration suitable for measurement by the laser particle size analyzer according to the specified method, and then introduce the sample into the laser particle size analyzer; Start the instrument to perform particle size analysis. The instrument measures the size of the particles based on the principle of laser scattering, automatically generates a particle size distribution curve, and outputs particle size distribution data.

[0014] Preferably, the method of using the cement additive includes: A1. Mix the cement additive with the cement in the specified proportion to ensure that the additive is evenly distributed in the cement. A2. Based on the required cement performance, the amount of cement additives used can be adjusted to achieve the best crack resistance, impermeability and strength performance. A3. Use mixed cement for construction to ensure that it can perform at its best during the hardening process, thereby improving the construction quality and the service life of the cement.

[0015] The beneficial effects of this invention are as follows: By optimizing the proportions of mineral supplements, ultrafine powders, crack-resistant agents, reinforcing agents, stabilizers, and moisture regulators, this invention improves the strength, crack resistance, impermeability, and fluidity of cement. Nano-sized silica and calcium carbonate increase density and enhance cement strength; crack-resistant agents and reinforcing agents improve crack resistance and toughness; stabilizers improve fluidity and ensure stable cement performance. The preparation method is highly efficient, and vacuum drying and particle size analysis are used to optimize the quality and uniformity of cement additives, thereby improving construction quality and service life. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating the steps of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0019] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0020] A method for preparing a cement additive includes: 20-40 parts of mineral supplement, 15-30 parts of ultrafine powder, 5-15 parts of crack-resistant agent, 10-20 parts of reinforcing agent, 5-10 parts of stabilizer and 5-10 parts of moisture regulator.

[0021] Mineral supplements include gypsum, talc, and silica fume, which optimize the chemical reaction process of cement and improve its strength. The ultrafine powder is one of nano-sized silica and calcium carbonate powder, which improves the density of cement and enhances its impermeability.

[0022] The crack-resistant agent is a polymer material that inhibits cracks generated in cement during the hardening process and improves the crack resistance of cement. The reinforcing agent is one of cellulose, polypropylene fiber, and polyethylene fiber, which enhances the tensile strength and toughness of cement. The stabilizer is one of natural polymer, glycerol, and mannitol, which regulates the fluidity of cement and ensures its stability during use. The moisture regulator is one of hydrated calcium silicate, gypsum, and mineral powder, which regulates the hydration process of cement and reduces cracks that occur during the drying process.

[0023] Reference Figure 1 As shown, the preparation steps include: S1. Select mineral supplements, ultrafine powders, crack-resistant agents, reinforcing agents, stabilizers, and moisture regulators according to the set ratio; S2. Mix the mineral supplement, ultrafine powder, crack-resistant agent, and reinforcing agent evenly to ensure the stable distribution of each component; S3. Add stabilizer and moisture regulator, mix evenly, and use high-shear mixing equipment to improve the mixing effect; S4. Excess moisture is removed by vacuum drying to ensure the stability and effectiveness of cement additives; S5. Perform particle size analysis on the treated cement additives to ensure that the particle size distribution is uniform and meets the requirements for cement use.

[0024] S2 specifically includes: Mineral supplements and ultrafine powders are pre-screened using a 60-mesh sieve to remove particles and impurities, ensuring that the raw materials entering the mixing process have uniform particle size. A planetary mixer is used to cause particles to collide and shear at high speed in the equipment, increasing the interaction force between particles. An electrostatic mixing device is used to reduce the adhesion and agglomeration of particles. According to the preset ratio, the mineral supplement, ultrafine powder, crack-resistant agent and reinforcing agent are added to the mixing equipment one by one. The mineral supplement and ultrafine powder are used as the base components and are added to the mixer first, followed by the crack-resistant agent and reinforcing agent. During the mixing process, electrostatic dispersion technology is introduced, and the electric field strength is set to make the particle surface charged, reducing electrostatic adsorption between particles and preventing the material from agglomerating during the mixing process.

[0025] S3 specifically includes: Add stabilizers and moisture regulators to the mixing equipment to adjust the humidity of the materials; Set the initial mixing speed to 300-500 rpm for dry mixing to allow all powder components to come into initial contact and form a preliminary uniform mixture, and continue for 2-5 minutes. Adjust the mixing speed to 1500-3000 rpm for vigorous mixing, and continue this process for 5-10 minutes to ensure that all ingredients are fully combined.

[0026] S4 specifically includes: Before vacuum drying, the cement additives are first screened. If there are lumps in the additives, they are initially crushed and loosened. Check the working status of the vacuum pump and the temperature control system. Based on the properties and requirements of the cement additives, set the drying temperature between 50°C and 80°C, and set the vacuum level to -0.08 to -0.1 MPa to lower the boiling point of water evaporation. Place the prepared cement additive in the vacuum drying tray, start the vacuum pump, reduce the internal pressure to the set vacuum level, and heat the material through the heating system. Observe the pressure and temperature changes in the equipment to ensure that the temperature remains stable within the set range throughout the process. During the drying process, the temperature, vacuum level, and material condition of the equipment are monitored regularly. When the moisture content in the cement additive reaches the predetermined standard, stop the vacuum pump, restore the environment to normal pressure, remove the dried cement additive from the drying equipment, and allow it to cool naturally at room temperature.

[0027] S5 specifically includes: Cement additives with particles larger than 0.075 mm were analyzed by sieving using standard sieves. Cement additives with particles ranging from 0.1 µm to 2000 µm were analyzed by laser particle size analyzer. For particles smaller than 0.1 µm, particle size analysis was performed by laser scattering. According to the standard requirements for cement, check whether the particle size distribution of cement additives meets the requirements. If the particle size distribution does not meet the requirements for cement use, optimize it by further crushing and by adjusting the screen aperture and time in the screening process. Record the process, results, and optimization measures of granularity analysis.

[0028] Particle size analysis specifically includes: The sieving method involves the following steps: Prepare a set of standard sieves with mesh sizes arranged from largest to smallest: 4.75mm, 2mm, 1mm, 0.5mm, 0.25mm, and 0.1mm. Place the cement additive sample evenly on the sieve mesh. Placed in a screening machine, the material particles are separated into layers according to their size through vibration screening; Vibrate for 5-10 minutes during each sieving process to ensure that the particles are fully sieved. Weigh the material on each screen and record the weight of each layer; The percentage content of different particle size ranges is calculated based on the sieving results, and the particle size distribution curve is obtained. The operation steps of laser particle size analysis are as follows: Dilute the sample to a concentration suitable for measurement by the laser particle size analyzer according to the specified method, and then introduce the sample into the laser particle size analyzer; Start the instrument to perform particle size analysis. The instrument measures the size of the particles based on the principle of laser scattering, automatically generates a particle size distribution curve, and outputs particle size distribution data.

[0029] The methods for using cement additives include: A1. Mix the cement additive with the cement in the specified proportion to ensure that the additive is evenly distributed in the cement. A2. Based on the required cement performance, the amount of cement additives used can be adjusted to achieve the best crack resistance, impermeability and strength performance. A3. Use mixed cement for construction to ensure that it can perform at its best during the hardening process, thereby improving the construction quality and the service life of the cement.

[0030] Example 1: A method for preparing a cement additive, comprising the following steps: S1: Prepare the following components: 15 parts mineral supplement gypsum, 10 parts talc powder, 5 parts silica fume mineral, 8 parts ultrafine powder nano-grade silica, 5 parts crack-resistant polymer, 10 parts reinforcing agent polypropylene fiber, 5 parts stabilizer natural polymer, and 5 parts moisture regulator hydrated calcium silicate. S2: Mix the mineral supplement, ultrafine powder, crack-resistant agent, and reinforcing agent evenly in proportion to ensure uniform distribution of each component; S3: Add stabilizers and moisture regulators, and mix thoroughly using a high-speed shear mixer to ensure a uniform formulation; S4: Excess moisture is removed through vacuum drying to ensure the stability and effectiveness of cement additives; S5: Perform particle size analysis on the treated cement additives to ensure that their particle size distribution is uniform and meets the requirements for cement use.

[0031] Example 2: A method for preparing a cement additive, comprising the following steps: S1: Prepare the following components: 20 parts mineral supplement gypsum, 10 parts talc, 10 parts silica fume mineral, 12 parts ultrafine calcium carbonate powder, 8 parts crack-resistant polymer, 12 parts reinforcing agent polyethylene fiber, 6 parts stabilizer glycerin, and 6 parts moisture regulator gypsum. S2: Mix the mineral supplement, ultrafine powder, crack-resistant agent, and reinforcing agent evenly; S3: Add stabilizer and moisture regulator, and use a planetary mixer to mix thoroughly to ensure uniform composition; S4: Excess moisture is removed through vacuum drying to ensure the stability of cement additives; S5: Use a laser particle size analyzer to perform particle size analysis to ensure that the particle size distribution meets the standard requirements.

[0032] Example 3: A method for preparing a cement additive, comprising the following steps: S1: Prepare the following components: 18 parts mineral supplement gypsum, 12 parts talc, 8 parts silica fume mineral, 10 parts ultrafine powder nano-grade silica, 7 parts crack-resistant polymer, 11 parts reinforcing agent polypropylene fiber, 4 parts stabilizer natural polymer, and 7 parts moisture regulator hydrated calcium silicate. S2: Mix the mineral supplement, ultrafine powder, crack-resistant agent, and reinforcing agent evenly; S3: Add stabilizer and moisture regulator, and mix at high speed; S4: Excess moisture is removed through vacuum drying to ensure the stability of cement additives; S5: Use sieving and laser particle size analyzers to ensure that the particle size meets the requirements for cement use.

[0033] Comparative example: Cement additives prepared using conventional methods but not by the method of this invention have the following disadvantages: It is impossible to effectively optimize the strength and impermeability of cement, and there is a lack of optimization for the chemical reaction process; Uneven particle size distribution affects the density and crack resistance of cement; Using traditional mixing equipment results in poor mixing and can easily lead to uneven component distribution. Cement additives have poor stability and are prone to quality changes after long-term storage, affecting the stability and quality of cement construction.

[0034] The table below shows the properties of cement additives prepared in different embodiments;

[0035] In summary, the advantages of this invention are: By optimizing the proportions of mineral supplements, ultrafine powders, crack-resistant agents, and other ingredients, the strength of cement can be improved. The addition of nano-sized silica can fill the tiny pores in the cement, increase the density of the cement, and further enhance the strength of the cement. The crack-resistant agent, reinforcing agent, and moisture regulator in this invention can effectively improve the crack resistance and impermeability of cement. The crack-resistant agent can inhibit the formation of cracks during the cement hardening process, while the reinforcing agent can significantly improve the tensile strength and toughness of cement, thereby improving the crack resistance of cement. The moisture regulator can prevent cracks from appearing in cement during the drying process by regulating the hydration process of cement. The use of stabilizers can regulate the fluidity of cement, ensuring that the cement has good workability during construction. In addition, the various components in cement additives can maintain stable performance during the use of cement through reasonable proportioning. By optimizing the microstructure of cement and increasing its density and strength, cement additives can effectively improve the overall performance of cement, thereby enhancing the quality and service life of buildings. The crack resistance and impermeability of cement are enhanced, enabling buildings to better cope with environmental changes and external pressures, and avoiding structural damage caused by cement aging and crack formation. The cement additive preparation method provided by this invention employs efficient mixing, sieving, vacuum drying, and particle size analysis processes, which can ensure the stable and uniform quality of the cement additive. By using high-shear mixing equipment, electrostatic dispersion technology, and vacuum drying process, not only is the stability of the cement additive improved, but also the agglomeration and clumping of particles are effectively avoided, thus ensuring the optimal performance of the cement additive. This invention ensures that the particle size distribution of cement additives is uniform through particle size analysis, meeting the requirements for cement use. The optimized particle size distribution can further improve the reactivity of cement and the fluidity of cement paste, thereby enhancing the overall performance of cement. It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0036] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0037] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for preparing a cement additive, characterized in that, include: 20-40 parts mineral supplement, 15-30 parts ultrafine powder, 5-15 parts crack-resistant agent, 10-20 parts reinforcing agent, 5-10 parts stabilizer, and 5-10 parts moisture regulator.

2. The method for preparing a cement additive according to claim 1, characterized in that: The mineral supplement includes gypsum, talc, and silica fume, which optimize the chemical reaction process of cement and improve its strength. The ultrafine powder is either nano-sized silica or calcium carbonate powder, which improves the density of cement and enhances its impermeability.

3. The method for preparing a cement additive according to claim 1, characterized in that: The crack-resistant agent is a polymer material that inhibits cracks generated during cement hardening and improves the crack resistance of cement. The reinforcing agent is one of cellulose, polypropylene fiber, and polyethylene fiber, which enhances the tensile strength and toughness of cement. The stabilizer is one of natural polymer, glycerol, and mannitol, which regulates the fluidity of cement and ensures its stability during use. The moisture regulator is one of hydrated calcium silicate, gypsum, and mineral powder, which regulates the hydration process of cement and reduces cracks that occur during cement drying.

4. The method for preparing a cement additive according to claim 1, characterized in that, The preparation steps include: S1. Select mineral supplements, ultrafine powders, crack-resistant agents, reinforcing agents, stabilizers, and moisture regulators according to the set ratio; S2. Mix the mineral supplement, ultrafine powder, crack-resistant agent, and reinforcing agent evenly to ensure the stable distribution of each component; S3. Add stabilizer and moisture regulator, mix evenly, and use high-shear mixing equipment to improve the mixing effect; S4. Excess moisture is removed by vacuum drying to ensure the stability and effectiveness of cement additives; S5. Perform particle size analysis on the treated cement additives to ensure that the particle size distribution is uniform and meets the requirements for cement use.

5. The method for preparing a cement additive according to claim 4, characterized in that, S2 specifically includes: Mineral supplements and ultrafine powders are pre-screened using a 60-mesh sieve to remove particles and impurities, ensuring that the raw materials entering the mixing process have uniform particle size. A planetary mixer is used to cause particles to collide and shear at high speed in the equipment, increasing the interaction force between particles. An electrostatic mixing device is used to reduce the adhesion and agglomeration of particles. According to the preset ratio, the mineral supplement, ultrafine powder, crack-resistant agent and reinforcing agent are added to the mixing equipment one by one. The mineral supplement and ultrafine powder are used as the base components and are added to the mixer first, followed by the crack-resistant agent and reinforcing agent. During the mixing process, electrostatic dispersion technology is introduced, and the electric field strength is set to make the particle surface charged, reducing electrostatic adsorption between particles and preventing the material from agglomerating during the mixing process.

6. The method for preparing a cement additive according to claim 4, characterized in that, S3 specifically includes: Add stabilizers and moisture regulators to the mixing equipment to adjust the humidity of the materials; Set the initial mixing speed to 300-500 rpm for dry mixing to allow all powder components to come into initial contact and form a preliminary uniform mixture, and continue for 2-5 minutes. Adjust the mixing speed to 1500-3000 rpm for vigorous mixing, and continue this process for 5-10 minutes to ensure that all ingredients are fully combined.

7. The method for preparing a cement additive according to claim 4, characterized in that, S4 specifically includes: Before vacuum drying, the cement additives are first screened. If there are lumps in the additives, they are initially crushed and loosened. Check the working status of the vacuum pump and the temperature control system. Based on the properties and requirements of the cement additives, set the drying temperature between 50°C and 80°C, and set the vacuum level to -0.08 to -0.1 MPa to lower the boiling point of water evaporation. Place the prepared cement additive in the vacuum drying tray, start the vacuum pump, reduce the internal pressure to the set vacuum level, and heat the material through the heating system. Observe the pressure and temperature changes in the equipment to ensure that the temperature remains stable within the set range throughout the process. During the drying process, the temperature, vacuum level, and material condition of the equipment are monitored regularly. When the moisture content in the cement additive reaches the predetermined standard, stop the vacuum pump, restore the environment to normal pressure, remove the dried cement additive from the drying equipment, and allow it to cool naturally at room temperature.

8. The method for preparing a cement additive according to claim 4, characterized in that, S5 specifically includes: Cement additives with particles larger than 0.075 mm were analyzed by sieving using standard sieves. Cement additives with particles ranging from 0.1 µm to 2000 µm were analyzed by laser particle size analyzer. For particles smaller than 0.1 µm, particle size analysis was performed by laser scattering. According to the standard requirements for cement, check whether the particle size distribution of cement additives meets the requirements. If the particle size distribution does not meet the requirements for cement use, optimize it by further crushing and by adjusting the screen aperture and time in the screening process. Record the process, results, and optimization measures of granularity analysis.

9. A method for preparing a cement additive according to claim 8, characterized in that, The particle size analysis specifically include: The sieving method involves the following steps: Prepare a set of standard sieves with mesh sizes arranged from largest to smallest: 4.75mm, 2mm, 1mm, 0.5mm, 0.25mm, and 0.1mm. Place the cement additive sample evenly on the sieve mesh. Placed in a screening machine, the material particles are separated into layers according to their size through vibration screening; Vibrate for 5-10 minutes during each sieving process to ensure that the particles are fully sieved. Weigh the material on each screen and record the weight of each layer; The percentage content of different particle size ranges is calculated based on the sieving results, and the particle size distribution curve is obtained. The operation steps of laser particle size analysis are as follows: Dilute the sample to a concentration suitable for measurement by the laser particle size analyzer according to the specified method, and then introduce the sample into the laser particle size analyzer; Start the instrument to perform particle size analysis. The instrument measures the size of the particles based on the principle of laser scattering, automatically generates a particle size distribution curve, and outputs particle size distribution data.

10. A method for preparing a cement additive according to claim 4, characterized in that, The method of using the cement additive includes: A1. Mix the cement additive with the cement in the specified proportion to ensure that the additive is evenly distributed in the cement. A2. Based on the required cement performance, the amount of cement additives used can be adjusted to achieve the best crack resistance, impermeability and strength performance. A3. Use mixed cement for construction to ensure that it can perform at its best during the hardening process, thereby improving the construction quality and the service life of the cement.

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