High-flowability anti-segregation ultra-high performance concrete and preparation method thereof

Abstract

The invention relates to a high-flowability anti-segregation ultra-high performance concrete, which is composed of the following components by weight: 350-450 parts of cement; 90 to 130 parts of silica fume; 110 parts to 160 parts of superfine mineral powder; 850 to 1100 parts of quartz sand; 12 parts to 22 parts of a high-performance water reducing agent; fibers: 12 to 32 parts; 1.5 to 3.5 parts of a thickening agent; 3.5 parts to 5.5 parts of an anti-segregation agent; 5 to 10 parts of nano silicon dioxide; 2 to 5 parts of graphene nanoplatelets; 3 to 8 parts of a whisker material; and 10 to 20 parts of active powder. By elaborately blending various special materials, the strength, crack resistance, impermeability, freezing resistance and the like of the concrete are greatly improved, and the requirements of various high-standard building structures are met.

Description

Technical Field

[0001] The invention relates to the technical field of concrete preparation, in particular to a high-flowability, segregation-resistant ultra-high performance concrete and a preparation method thereof. Background Art

[0002] With the continuous development and innovation of modern construction projects, the performance requirements for building materials are increasing. As one of the most widely used building materials, concrete plays a vital role in various infrastructure construction, high-rise buildings, long-span bridges, underground engineering and other fields. However, traditional concrete is gradually unable to meet the complex and high-standard engineering requirements in terms of performance.

[0003] In many large-scale projects and special structures, concrete needs to have super high strength to withstand huge loads. Due to the limitations of its materials and mix ratio, traditional concrete has limited room for strength improvement and is difficult to meet the extremely high strength requirements of some key parts, which may lead to hidden dangers in the safety and durability of the structure. For example, in super high-rise buildings, the bottom columns and load-bearing walls need to withstand huge pressure, and ordinary concrete may not provide sufficient compressive resistance, thus affecting the overall stability of the building.

[0004] At the same time, the construction performance of concrete is also a key issue. In some complex building structures, such as special-shaped components, casting in narrow spaces, and projects that require long-distance pumping, concrete is required to have high fluidity so that it can smoothly fill the formwork and reach the designated location. However, while traditional concrete improves fluidity, it is often prone to segregation, that is, the components in the concrete separate, causing aggregates to sink and cement slurry to float. This not only affects the uniformity of the quality of the concrete, but may also cause weak areas in the structure and reduce its overall performance.

[0005] In some special environment projects, such as marine engineering and chemical engineering, concrete also needs to have good impermeability, frost resistance and corrosion resistance. Traditional concrete is prone to cracks, peeling and other damage when facing seawater erosion, freeze-thaw cycles and chemical corrosion, which shortens the service life of the building and increases maintenance costs.

[0006] In addition, with the increasing awareness of environmental protection and the requirements of sustainable development, green building materials and resource conservation have also become important development directions. The traditional concrete production process consumes a large amount of resources such as cement, and a large amount of carbon dioxide emissions are generated during the preparation and use process, which puts great pressure on the environment. Therefore, there is an urgent practical need to develop a new type of concrete material and its preparation method that can meet high performance requirements and have environmental protection characteristics.

[0007] In summary, in order to solve the shortcomings of traditional concrete in terms of strength, construction performance, durability and environmental protection, it is urgently necessary to develop a high-flowability and anti-segregation ultra-high performance concrete and its innovative preparation process to promote technological progress and sustainable development in the construction industry. Summary of the invention

[0008] 1. Technical issues to be resolved

[0009] In view of the deficiencies in the prior art, the present invention provides a high-flowability, segregation-resistant ultra-high performance concrete and a preparation method thereof.

[0010] (II) Technical solution

[0011] A high-flowability, anti-segregation ultra-high performance concrete, comprising the following components in parts by weight:

[0012] Cement: 350 to 450 parts;

[0013] Silica fume: 90 to 130 parts;

[0014] Ultrafine mineral powder: 110 to 160 parts;

[0015] Quartz sand: 850 to 1100 parts, of which 42% to 52% are from 0.1 mm to 0.5 mm in size, 32% to 42% are from 0.5 mm to 1 mm in size, and 12% to 22% are from 1 mm to 2 mm in size;

[0016] High performance water reducing agent: 12 to 22 parts;

[0017] Fiber: 12 to 32 parts, fiber length 8 mm to 15 mm;

[0018] Thickener: 1.5 to 3.5 parts;

[0019] Anti-segregation agent: 3.5 to 5.5 parts;

[0020] Nano silicon dioxide: 5 to 10 parts;

[0021] Graphene microsheets: 2 to 5 parts;

[0022] Whisker material: 3 to 8 parts;

[0023] Active powder: 10 to 20 parts.

[0024] Furthermore, the cement is silicate cement or ordinary silicate cement with a strength grade of not less than 52.5, and has been subjected to a special activation treatment, wherein the activator is a mixture of sodium sulfate and calcium chloride, and the addition amount thereof is 1% to 3% of the weight of the cement;

[0025] The fibers are steel fibers, polypropylene fibers and basalt fibers mixed in proportion, and the mixing ratio is steel fibers: polypropylene fibers: basalt fibers = (3-5): (2-4): (1-3);

[0026] The high-performance water-reducing agent has a water-reducing rate of not less than 35% and contains a specific slow-release component, which can continuously exert a water-reducing effect during the concrete hardening process;

[0027] The thickener is a mixture of hydroxypropyl methylcellulose and Weinlun gum in a certain proportion, and the mixing ratio is hydroxypropyl methylcellulose: Weinlun gum = (1-2): (1-2);

[0028] The anti-segregation agent is composed of the following raw materials in parts by weight: 6 to 9 parts of modified starch, 1.2 to 2.2 parts of polyvinyl alcohol, and 1.5 to 3.5 parts of polycarboxylic acid polymers, and is added with a microencapsulated rheology regulator, wherein the particle size of the microcapsules is 10 to 50 microns, and the microcapsules are gradually released during the concrete mixing process to adjust the rheological properties of the concrete.

[0029] Furthermore, the nano-silicon dioxide has a particle size of 10 nanometers to 50 nanometers, and is surface-modified and surface-grafted with an organic silane coupling agent to improve its dispersibility in concrete and its binding force with other components;

[0030] The graphene microsheets have a sheet diameter of 1 micrometer to 5 micrometers and a thickness of 1 nanometer to 3 nanometers, and form a conductive network in the concrete to improve the antistatic performance and electromagnetic shielding performance of the concrete;

[0031] The whisker material is calcium sulfate whisker or silicon carbide whisker, with a length of 10 to 50 microns and a diameter of 0.1 to 1 micron, which can significantly enhance the mechanical properties and crack resistance of concrete;

[0032] The active powder is a mixture of ultrafine siliceous and calcareous materials in a proportion of siliceous material:calcareous material = (2-3): (1-2), with an average particle size of no more than 10 microns. It has extremely high volcanic ash activity and can undergo secondary reactions with cement hydration products to further improve the strength and durability of concrete.

[0033] Furthermore, a method for preparing high-flow and anti-segregation ultra-high performance concrete comprises the following steps:

[0034] Raw material preparation steps: weigh cement, silica fume, ultrafine mineral powder, quartz sand, high-performance water reducer, fiber, thickener, anti-segregation agent, nano-silica, graphene microsheets, whisker material and active powder according to weight;

[0035] Dry material mixing step: adding cement, silica fume, ultrafine mineral powder, quartz sand, nano-silicon dioxide, graphene micro-sheets, whisker material and active powder into a mixer, stirring at a speed of 35 rpm to 55 rpm for 2.5 to 3.5 minutes to mix them evenly;

[0036] Water adding and stirring step: adding water accounting for 72% to 82% of the total water consumption into the mixer, adding a high-performance water reducing agent, a thickener and an anti-segregation agent at the same time, and stirring at a speed of 85 rpm to 105 rpm for 3.5 minutes to 5.5 minutes;

[0037] Fiber dispersing and adding step: pre-dispersing the fiber in an aqueous solution containing a dispersant, the amount of the dispersant used being 0.5% to 1.5% of the fiber weight, then slowly adding the dispersed fiber into a mixer, and continuing to stir at a speed of 55 rpm to 75 rpm for 2.5 minutes to 3.5 minutes;

[0038] Ultrasonic treatment step: ultrasonic treatment of concrete with ultrasonic equipment, with an ultrasonic frequency of 25kHz to 55kHz and a treatment time of 2 minutes to 5 minutes, so as to further improve the dispersion of each component and the uniformity of the concrete;

[0039] Adjustment steps: According to the fluidity and anti-segregation performance of the concrete, add the remaining water to adjust it to the optimal state;

[0040] Discharging step: discharging the prepared high-flowability, anti-segregation ultra-high performance concrete from the mixer.

[0041] Furthermore, in the raw material preparation step, the fiber is pretreated by soaking the fiber in a solution containing a coupling agent for 12 to 22 minutes, and the amount of the coupling agent is 1.2% to 2.2% of the fiber weight. The coupling agent is a mixture of a silane coupling agent and a titanate coupling agent in a proportion of silane coupling agent: titanate coupling agent = (2-3): (1-2);

[0042] In the step of adding water and stirring, the water temperature is controlled within the range of 22°C to 32°C, and a certain amount of retarder is added to the water, the amount of the retarder being 0.1% to 0.5% of the weight of the cement;

[0043] In the ultrasonic treatment step, the ultrasonic parameters are adjusted in real time according to the components and mixing state of the concrete, a dynamic optimization model of ultrasonic parameters and concrete performance is established, and automatic adjustments are made through an intelligent control system.

[0044] Furthermore, in the adjustment step, a laser particle size analyzer and a rheometer are used to monitor the particle distribution and rheological properties of the concrete in real time, and water addition adjustment and admixture optimization addition are performed based on the monitoring results. The detection range of the laser particle size analyzer is 0.01 microns to 1000 microns, and the test modes of the rheometer include shear stress-shear rate test and dynamic oscillation test;

[0045] Before the discharging step, the concrete is vacuum treated with a vacuum degree of -0.065MPa to -0.085MPa for 1.2 minutes to 2.2 minutes. Mechanical vibration is also performed during the vacuum treatment with a vibration frequency of 20Hz to 50Hz to expel bubbles in the concrete and improve the density of the concrete.

[0046] Furthermore, after the fiber is soaked, it is dried at a temperature of 65°C to 85°C for a time of 35 minutes to 65 minutes. In the drying process, intermittent heating is used, with a 1 minute pause every 5 minutes of heating to prevent the fiber from being overheated and damaged;

[0047] After adding the retarder to the water, the water quality is tested and the pH is adjusted to control the pH value of the water within the range of 6.5 to 8.5 to ensure the stable performance of the admixture and the reliable quality of the concrete.

[0048] Furthermore, during the monitoring process of the laser particle size analyzer and rheometer, a multi-parameter comprehensive evaluation system is established to comprehensively analyze and evaluate the particle distribution, rheological properties, fluidity and anti-segregation performance indicators, and intelligent process parameter adjustment and quality control are carried out according to the evaluation results;

[0049] During the vacuum treatment and mechanical vibration process, sensors are used to monitor the vacuum degree, vibration frequency and amplitude parameters in real time, and automatic adjustments and optimizations are performed through the feedback control system to ensure the stability and consistency of the treatment effect.

[0050] Furthermore, the initial slump of the concrete is not less than 260 mm and the spread is not less than 650 mm;

[0051] The slump loss of concrete within 1 hour shall not exceed 18 mm, and the expansion loss shall not exceed 45 mm;

[0052] The compressive strength of the concrete shall not be less than 150MPa at the age of 28 days, and the flexural strength shall not be less than 25MPa. It shall also have good impermeability and frost resistance, with the impermeability grade not less than P20 and the frost resistance grade not less than F300.

[0053] Furthermore, during the preparation process, the time, temperature, rotation speed, water consumption, and admixture dosage parameters of each step are precisely controlled, and an automated control system is used for real-time monitoring and adjustment to ensure the stable performance and reliable quality of the concrete, establish a process parameter database, and continuously optimize and improve the preparation process through big data analysis and machine learning algorithms;

[0054] The prepared concrete is sampled for testing and performance evaluation, and a quality traceability system is established, including the recording and tracking of raw material sources, production process parameters, and performance test data information. At the same time, the concrete application process is tracked and feedback is provided.

[0055] (III) Beneficial technical effects

[0056] The present invention greatly improves the strength, crack resistance, impermeability and frost resistance of concrete by carefully blending a variety of special materials, such as nano-silicon dioxide, graphene microsheets, whisker materials and active powders, to meet the needs of various high-standard building structures.

[0057] The present invention achieves high fluidity and good anti-segregation performance of concrete through unique mix design and synergistic effects of admixtures such as high-performance water reducer, thickener and anti-segregation agent, combined with advanced preparation processes such as ultrasonic treatment and mechanical vibration-assisted vacuum treatment, thereby improving construction efficiency and quality.

[0058] The present invention improves the density, antistatic properties and electromagnetic shielding properties of concrete through innovative applications such as surface modification of nano-silicon dioxide and formation of a conductive network of graphene microsheets in concrete.

[0059] The present invention reduces cement usage and carbon dioxide emissions during the production process by using active powder with high volcanic ash activity, thereby achieving environmental protection and resource conservation.

[0060] The present invention adopts a multi-step precise control preparation method, including fiber pretreatment, precise control of water temperature and admixtures, real-time monitoring of multiple devices and special process treatment, and establishes a multi-parameter comprehensive evaluation system and intelligent control system to ensure the stability and reliability of concrete performance and efficient optimization of production.

[0061] Through the above innovative design and process, the present invention provides a high-performance building material solution for various construction engineering fields, and promotes technological innovation and progress in the construction industry. DETAILED DESCRIPTION

[0062] A high-flowability, anti-segregation, ultra-high performance concrete, comprising the following components in parts by weight:

[0063] Cement: 350 to 450 parts; the cement is silicate cement or ordinary silicate cement with a strength grade of not less than 52.5, and has undergone special activation treatment, the activator is a mixture of sodium sulfate and calcium chloride, and the addition amount is 1% to 3% of the weight of the cement;

[0064] Silica fume: 90 to 130 parts;

[0065] Ultrafine mineral powder: 110 to 160 parts;

[0066] Quartz sand: 850 to 1100 parts, of which 42% to 52% are from 0.1 mm to 0.5 mm in size, 32% to 42% are from 0.5 mm to 1 mm in size, and 12% to 22% are from 1 mm to 2 mm in size;

[0067] High-performance water-reducing agent: 12 to 22 parts; the water-reducing rate of the high-performance water-reducing agent is not less than 35%, and it contains a specific slow-release component, which can continuously play a water-reducing role during the concrete hardening process;

[0068] Fiber: 12 to 32 parts, fiber length is 8 mm to 15 mm; the fiber is a mixture of steel fiber, polypropylene fiber and basalt fiber in a proportion of steel fiber: polypropylene fiber: basalt fiber = (3-5): (2-4): (1-3);

[0069] Thickener: 1.5 to 3.5 parts; the thickener is a mixture of hydroxypropyl methylcellulose and Weinlun gum in a proportion of hydroxypropyl methylcellulose: Weinlun gum = (1-2): (1-2);

[0070] Anti-segregation agent: 3.5 to 5.5 parts; the anti-segregation agent is composed of the following raw materials in parts by weight: 6 to 9 parts of modified starch, 1.2 to 2.2 parts of polyvinyl alcohol, 1.5 to 3.5 parts of polycarboxylic acid polymer, and a microencapsulated rheology regulator is added, the particle size of the microcapsule is 10 to 50 microns, which is gradually released during the concrete mixing process to adjust the rheological properties of the concrete;

[0071] Nano silicon dioxide: 5 to 10 parts; the particle size of the nano silicon dioxide is 10 to 50 nanometers, and it has been surface-modified and grafted with an organic silane coupling agent to improve its dispersibility in concrete and its binding force with other components;

[0072] Graphene microsheets: 2 to 5 parts; the graphene microsheets have a diameter of 1 to 5 micrometers and a thickness of 1 to 3 nanometers, and form a conductive network in the concrete to improve the antistatic and electromagnetic shielding properties of the concrete;

[0073] Whisker material: 3 to 8 parts; the whisker material is calcium sulfate whisker or silicon carbide whisker, with a length of 10 to 50 microns and a diameter of 0.1 to 1 micron, which can significantly enhance the mechanical properties and crack resistance of concrete;

[0074] Active powder: 10 to 20 parts. The active powder is a mixture of ultrafine siliceous and calcareous materials in a proportion of siliceous material:calcareous material = (2-3):(1-2). The average particle size is no more than 10 microns. It has extremely high volcanic ash activity and can undergo secondary reaction with cement hydration products to further improve the strength and durability of concrete.

[0075] Example 1

[0076] (1) Raw material preparation steps: weigh 350 kg of cement, 100 kg of silica fume, 120 kg of ultrafine mineral powder, 1000 kg of quartz sand, 15 kg of high-performance water reducer, 20 kg of fiber, 2 kg of thickener, 4 kg of anti-segregation agent, 10 kg of nano-silica, 5 kg of graphene microplatelets, 5 kg of whisker material and 15 kg of active powder.

[0077] The fiber pretreatment is to immerse the fiber in a solution containing a silane coupling agent and a titanate coupling agent in a mixing ratio of 2:1 for 20 minutes, and the amount of the coupling agent is 2.2% of the fiber weight; after the fiber is immersed, it is dried at a temperature of 85°C and a drying time of 50 minutes. In the drying process, intermittent heating is used, and 1 minute is paused every 5 minutes of heating to prevent the fiber from being overheated and damaged.

[0078] (2) Dry material mixing step: cement, silica fume, ultrafine mineral powder, quartz sand, nano-silicon dioxide, graphene microplatelets, whisker material and active powder are added into a mixer and stirred at a speed of 50 rpm for 3 minutes to mix them evenly.

[0079] (3) Water adding and stirring step: add water accounting for 80% of the total water consumption into the mixer, add a retarder of 0.1% of the weight of cement, and add a high-performance water reducing agent, a thickener and an anti-segregation agent at the same time. The water temperature is controlled at 32°C and stirred at a speed of 105 rpm for 5.5 minutes.

[0080] After adding the retarder to the water, the water quality is tested and the pH is adjusted to control the pH value of the water within the range of 6.5 to 8.5 to ensure the stable performance of the admixture and the reliable quality of the concrete.

[0081] (4) Fiber dispersion and addition step: The fibers are pre-dispersed in an aqueous solution containing a dispersant, the amount of the dispersant being 1.5% of the fiber weight, and then the dispersed fibers are slowly added to a mixer and stirred at a speed of 75 rpm for 3.5 minutes.

[0082] (5) Ultrasonic treatment step: The concrete was ultrasonically treated with an ultrasonic device at a frequency of 50 kHz for 5 minutes to further improve the dispersion of the components and the uniformity of the concrete.

[0083] The ultrasonic parameters are adjusted in real time according to the composition and mixing state of the concrete, a dynamic optimization model of ultrasonic parameters and concrete performance is established, and automatic adjustments are made through an intelligent control system.

[0084] (6) Adjustment steps: Add the remaining water to adjust the concrete to its optimal state according to its fluidity and anti-segregation performance.

[0085] Laser particle size analyzer and rheometer are used to monitor the particle distribution and rheological properties of concrete in real time. Water addition adjustment and admixture optimization are carried out according to the monitoring results. The detection range of laser particle size analyzer is 0.01 micron to 1000 micron, and the test mode of rheometer includes shear stress-shear rate test and dynamic oscillation test. During the monitoring process of laser particle size analyzer and rheometer, a multi-parameter comprehensive evaluation system is established to comprehensively analyze and evaluate the particle distribution, rheological properties, fluidity and anti-segregation performance indicators, and intelligent process parameter adjustment and quality control are carried out according to the evaluation results.

[0086] (7) Discharging step: The concrete is subjected to vacuum treatment with a vacuum degree of -0.085 MPa for 2.2 minutes, and mechanical vibration is simultaneously performed during the vacuum treatment process with a vibration frequency of 20 Hz to expel bubbles in the concrete and improve the density of the concrete, and the prepared high-flowability, anti-segregation ultra-high performance concrete is discharged from the mixer.

[0087] During the vacuum treatment and mechanical vibration process, sensors are used to monitor the vacuum degree, vibration frequency and amplitude parameters in real time, and automatic adjustments and optimizations are performed through the feedback control system to ensure the stability and consistency of the treatment effect.

[0088] Comparative Example 1: No nano-silicon dioxide, graphene microsheets, whisker material and active powder were added, and the remaining processes were the same as in Example 1.

[0089] Comparative Example 2: No high-performance water reducing agent, thickener and anti-segregation agent were added, and no ultrasonic treatment or mechanical vibration-assisted vacuum treatment process was used. The remaining processes were the same as in Example 1.

[0090] Performance Test:

[0091] 1. The concrete of Example 1 and Comparative Example 1 were tested according to GB / T 50081-2019. The test results are shown in Table 1;

[0092] Table 1

[0093] Group Example 1 Comparative Example 1 28d compressive strength 160MPa 132MPa 28d flexural strength 25MPa 14MPa Impermeability P20 ＜P20 Antifreeze grade F300 ＜F300

[0094] It can be seen from Table 1 that the compressive strength, flexural strength, impermeability and frost resistance of Example 1 are better than those of Comparative Example 1. The addition of nano-silica, graphene microsheets, whisker materials and active powders can greatly improve the strength, crack resistance, impermeability and frost resistance of concrete.

[0095] 2. The fluidity and anti-segregation performance of Example 1 and Comparative Example 2 were tested according to GB / T 50081-2019. The results are shown in Table 2;

[0096] Table 2

[0097]

[0098]

[0099] It can be seen from Table 2 that the concrete of Example 1 has better anti-segregation performance and higher fluidity.

[0100] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and effectiveness.

[0101] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-flow, anti-segregation ultra-high performance concrete, characterized in that: It is composed of the following components in parts by weight: Cement: 350 to 450 parts; Silica fume: 90 to 130 parts; Ultrafine mineral powder: 110 to 160 parts; Quartz sand: 850 to 1100 parts, of which 42% to 52% are from 0.1 mm to 0.5 mm in size, 32% to 42% are from 0.5 mm to 1 mm in size, and 12% to 22% are from 1 mm to 2 mm in size; High performance water reducing agent: 12 to 22 parts; Fiber: 12 to 32 parts, fiber length 8 mm to 15 mm; Thickener: 1.5 to 3.5 parts; Anti-segregation agent: 3.5 to 5.5 parts; Nano silicon dioxide: 5 to 10 parts; Graphene microsheets: 2 to 5 parts; Whisker material: 3 to 8 parts; Active powder: 10 to 20 parts.

2. The high-flow, anti-segregation ultra-high performance concrete according to claim 1, characterized in that: The cement is silicate cement or ordinary silicate cement with a strength grade of not less than 52.5, and has been subjected to a special activation treatment, the activator being a mixture of sodium sulfate and calcium chloride, and the addition amount thereof being 1% to 3% of the weight of the cement; The fibers are steel fibers, polypropylene fibers and basalt fibers mixed in a certain proportion, and the mixing ratio is steel fibers: polypropylene fibers: basalt fibers = (3-5): (2-4): (1-3); The thickener is a mixture of hydroxypropyl methylcellulose and Weinlun gum in a certain proportion, and the mixing ratio is hydroxypropyl methylcellulose: Weinlun gum = (1-2): (1-2); The anti-segregation agent is composed of the following raw materials in parts by weight: 6 to 9 parts of modified starch, 1.2 to 2.2 parts of polyvinyl alcohol, 1.5 to 3.5 parts of polycarboxylic acid polymer, and a microencapsulated rheology regulator is added, and the particle size of the microcapsule is 10 to 50 microns.

3. The high-flow, anti-segregation ultra-high performance concrete according to claim 1, characterized in that: The nano-silicon dioxide has a particle size of 10 nanometers to 50 nanometers, and is surface-modified and surface-grafted with an organic silane coupling agent to improve its dispersibility in concrete and its binding force with other components; The graphene microsheet has a sheet diameter of 1 micrometer to 5 micrometers and a thickness of 1 nanometer to 3 nanometers; The whisker material is calcium sulfate whisker or silicon carbide whisker, with a length of 10 to 50 microns and a diameter of 0.1 to 1 micron; The active powder is a mixture of ultrafine silicon and calcium materials in a proportion of silicon material:calcium material = (2-3): (1-2), and its average particle size is no more than 10 microns.

4. A high-flow, anti-segregation ultra-high performance concrete according to any one of claims 1 to 3, characterized in that: The following steps are involved: Raw material preparation steps: weigh cement, silica fume, ultrafine mineral powder, quartz sand, high-performance water reducer, fiber, thickener, anti-segregation agent, nano-silica, graphene microsheets, whisker material and active powder according to weight; Dry material mixing step: adding cement, silica fume, ultrafine mineral powder, quartz sand, nano-silicon dioxide, graphene micro-sheets, whisker material and active powder into a mixer, stirring at a speed of 35 rpm to 55 rpm for 2.5 to 3.5 minutes to mix them evenly; Water adding and stirring step: adding water accounting for 72% to 82% of the total water consumption into the mixer, adding a high-performance water reducing agent, a thickener and an anti-segregation agent at the same time, and stirring at a speed of 85 rpm to 105 rpm for 3.5 minutes to 5.5 minutes; Fiber dispersing and adding step: pre-dispersing the fiber in an aqueous solution containing a dispersant, the amount of the dispersant used being 0.5% to 1.5% of the fiber weight, then slowly adding the dispersed fiber into a mixer, and continuing to stir at a speed of 55 rpm to 75 rpm for 2.5 minutes to 3.5 minutes; Ultrasonic treatment step: ultrasonic treatment of concrete with ultrasonic equipment, with an ultrasonic frequency of 25kHz to 55kHz and a treatment time of 2 minutes to 5 minutes, so as to further improve the dispersion of each component and the uniformity of the concrete; Adjustment steps: According to the fluidity and anti-segregation performance of the concrete, add the remaining water to adjust it to the optimal state; Discharging step: discharging the prepared high-flowability, anti-segregation ultra-high performance concrete from the mixer.

5. The high-flow, anti-segregation ultra-high performance concrete according to claim 4, characterized in that: In the raw material preparation step, the fiber is pretreated by soaking the fiber in a solution containing a coupling agent for 12 to 22 minutes, and the amount of the coupling agent used is 1.2% to 2.2% of the fiber weight; the coupling agent is a mixture of a silane coupling agent and a titanate coupling agent in a proportion of silane coupling agent: titanate coupling agent = (2-3): (1-2); In the step of adding water and stirring, the water temperature is controlled within the range of 22°C to 32°C, and a retarder is added to the water, the amount of the retarder being 0.1% to 0.5% of the weight of the cement; In the ultrasonic treatment step, the ultrasonic parameters are adjusted in real time according to the components and mixing state of the concrete, a dynamic optimization model of ultrasonic parameters and concrete performance is established, and automatic adjustments are made through an intelligent control system.

6. The high-flow, anti-segregation ultra-high performance concrete according to claim 4, characterized in that: In the adjustment step, a laser particle size analyzer and a rheometer are used to monitor the particle distribution and rheological properties of concrete in real time, and water addition and admixture addition are adjusted based on the monitoring results; the detection range of the laser particle size analyzer is 0.01 microns to 1000 microns, and the test modes of the rheometer include shear stress-shear rate test and dynamic oscillation test; Before the discharging step, the concrete is vacuum treated with a vacuum degree of -0.065MPa to -0.085MPa for 1.2 minutes to 2.2 minutes. Mechanical vibration is also performed during the vacuum treatment with a vibration frequency of 20Hz to 50Hz to expel bubbles in the concrete and improve the density of the concrete.

7. The high-flow, anti-segregation ultra-high performance concrete according to claim 5, characterized in that: After the fiber is soaked, it is dried at a temperature of 65°C to 85°C for a time of 35 minutes to 65 minutes. During the drying process, intermittent heating is used, with a 1 minute pause after every 5 minutes of heating. After adding the retarder to the water, conduct water quality testing and pH adjustment to control the pH value of the water within the range of 6.5 to 8.

5.

8. The high-flow, anti-segregation ultra-high performance concrete according to claim 6, characterized in that: During the monitoring process of the laser particle size analyzer and rheometer, a multi-parameter comprehensive evaluation system is established to comprehensively analyze and evaluate the particle distribution, rheological properties, fluidity and anti-segregation performance indicators, and intelligent process parameter adjustment and quality control are carried out according to the evaluation results; During the vacuum treatment and mechanical vibration process, sensors are used to monitor the vacuum degree, vibration frequency and amplitude parameters in real time, and automatic adjustment and optimization are carried out through the feedback control system.

9. The high-flow, anti-segregation ultra-high performance concrete according to any one of claims 4 to 8, characterized in that: During the preparation process, the time, temperature, rotation speed, water consumption, and admixture dosage of each step are precisely controlled, and an automated control system is used for real-time monitoring and adjustment to ensure the stability of concrete performance and reliable quality. A process parameter database is established, and the preparation process is continuously optimized and improved through big data analysis and machine learning algorithms. The prepared concrete is sampled for testing and performance evaluation, and a quality traceability system is established, including the recording and tracking of raw material sources, production process parameters, and performance test data information. At the same time, the concrete application process is tracked and feedback is provided.

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