A method for preparing ultra-high performance cement-based materials incorporating waste glass powder

Abstract

This invention relates to the field of building material preparation technology, and discloses a method for preparing an ultra-high performance cement-based material incorporating waste glass powder, comprising the following steps: S1, providing cement, waste glass powder, silica fume, fine aggregate, nano-titanium dioxide, graphene, phase change material, green high-efficiency water-reducing agent, and steel fiber; S2, dispersing graphene in deionized water to form a graphene suspension; S3, microencapsulating the phase change material; S4, dry mixing the cement, waste glass powder, silica fume, fine aggregate, and nano-titanium dioxide to form a basic mixture. By employing magnetorheological fluid technology for compaction, microencapsulating the phase change material, and carbon dioxide curing technology, the density and durability of the material are significantly improved. Simultaneously, by adjusting the temperature and forming a carbonized layer, freeze-thaw resistance and impermeability are improved, extending the service life. Furthermore, this invention uses environmentally friendly materials and a high-efficiency water-reducing agent, making the preparation process more energy-efficient and environmentally friendly.

Description

Technical Field

[0001] This invention relates to the field of building material preparation technology, specifically to a method for preparing ultra-high performance cement-based materials by incorporating waste glass powder. Background Technology

[0002] With the rapid development of the global construction industry and the acceleration of urbanization, cement-based materials are being used more and more widely in construction projects. Due to their low cost, high plasticity, and wide applicability, cement-based materials have become a major choice for building materials. However, with technological advancements and stricter building standards, the performance of traditional cement-based materials can no longer fully meet the requirements of modern buildings for high strength, high durability, and environmental friendliness.

[0003] In the traditional production process of cement-based materials, cement, as the main binder, reacts with aggregates and water to form a solid material with certain strength and durability. To improve the performance of cement-based materials, researchers have continuously explored various methods, such as adding mineral admixtures (e.g., silica fume, fly ash, and slag) to enhance their strength and durability. Silica fume, due to its ultrafine particles and high reactivity, is widely used as an important admixture for improving the performance of cement-based materials.

[0004] In recent years, waste glass powder (WGP) has been gradually introduced into cement-based materials as a mineral admixture. Studies have found that the incorporation of waste glass powder can not only effectively reduce the amount of cement used and reduce carbon dioxide emissions, but also significantly improve the performance of cement-based materials.

[0005] While these methods have achieved some success, they still face numerous challenges. For example, traditional mechanical vibration compaction methods are prone to generating air bubbles and voids, resulting in insufficient material density and strength. Furthermore, cement-based materials are affected by environmental factors such as temperature and humidity changes, and chemical corrosion during long-term use, leading to the formation and gradual expansion of microcracks within the material, impacting its durability. In cold regions, freeze-thaw cycles are a significant factor affecting the durability of cement-based materials; traditional materials are prone to cracking and spalling after repeated freeze-thaw cycles. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a method for preparing ultra-high performance cement-based materials by incorporating waste glass powder, which solves the problems of density, durability, environmental friendliness, and workability of cement-based materials incorporating non-glass powder.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing an ultra-high performance cement-based material incorporating waste glass powder, comprising the following steps:

[0008] S1 provides cement, waste glass powder, silica fume, fine aggregate, nano titanium dioxide, graphene, phase change materials, green and high-efficiency water-reducing agents and steel fibers;

[0009] S2. Graphene is dispersed in deionized water to form a graphene suspension;

[0010] S3. Microencapsulation of phase change materials;

[0011] S4. Dry mix cement, waste glass powder, silica fume, fine aggregate and nano titanium dioxide to form a basic mixture;

[0012] S5. The basic mixture, graphene suspension, and microencapsulated phase change material are wet-mixed in a high-shear mixer until a homogeneous mixture is formed.

[0013] S6. Gradually add green and efficient water-reducing agent during the wet mixing process to adjust the working performance of the mixture;

[0014] S7. Finally, add the steel fibers and continue stirring until the steel fibers are evenly distributed.

[0015] S8. Pour the mixture into a mold and compact it using magnetorheological fluid technology;

[0016] S9. After initial setting, demold the sample and place it in a curing chamber for standard curing.

[0017] S10. During the curing period, the phase change material is periodically heated to release energy and regulate the internal temperature of the material.

[0018] S11. After curing for 28 days, the sample is subjected to high-temperature sintering treatment.

[0019] Preferably, in step S1, by weight percentage, the following components are present: 50-70% cement, 10-20% waste glass powder, 5-15% silica fume, 10-20% fine aggregate, 1-5% nano titanium dioxide, 0.1-1% graphene, 1-5% phase change material, 0.5-2% green and efficient water-reducing agent, and 0.5-2% steel fiber.

[0020] Preferably, the phase change material is selected from paraffin wax and fatty acids, and the green high-efficiency water-reducing agent is selected from plant-based water-reducing agent, tannic acid or guar gum.

[0021] Preferably, the specific steps of the microencapsulation process in step S3 include the following:

[0022] S3.1 Preparation of phase change material solution:

[0023] The solid phase change material is heated to a molten state and then dissolved in an appropriate amount of water or organic solvent to form a homogeneous solution.

[0024] S3.2. Prepare wall material solution:

[0025] Take gelatin and gum arabic, dissolve them separately in warm water at 40-50℃, stir well to form a gelatin-gum arabic composite wall material solution;

[0026] S3.3, Mixing phase change material and wall material solution: Slowly add the phase change material solution dropwise into the wall material solution while stirring, maintaining the temperature at 40-50℃ and the stirring speed at 300-500rpm;

[0027] S3.4 Formation of microcapsules: The temperature of the mixed solution is lowered to 10-15℃, and the mixture is stirred continuously to allow the phase change material to gradually solidify and form microcapsules. The pH value is adjusted to 4.0-4.5 to promote the co-precipitation and encapsulation of the microcapsule wall material.

[0028] S3.5, Solidification and Collection: The formed microcapsules are solidified by freeze drying or spray drying. The dried microcapsules are collected, sieved, and microcapsule phase change materials with uniform particle size are obtained.

[0029] Preferably, the method for adjusting the working performance of the mixture in step S6 is to test the fluidity and stability of the mixture using slump tests, spread tests, and segregation tests, respectively, and adjust the dosage of the water-reducing agent based on the test results. The method for adjusting the dosage of the water-reducing agent is as follows:

[0030] If the fluidity is insufficient, the amount of water-reducing agent added should be increased;

[0031] If the mixture segregates, reduce the amount of water-reducing agent or increase the proportion of fine aggregate.

[0032] Preferably, the periodic heating rule in step S10 is as follows:

[0033] Initial settings:

[0034] The initial heating time is set to 1.5-2 hours, and the material temperature is gradually increased to the phase change temperature of the phase change material. The initial heating temperature is controlled at the high value within the phase change temperature range.

[0035] Heating cycle setting: The heating cycle is set to once every 7.5-8 hours, with each heating cycle lasting 0.5-1 hour. During each heating cycle, the temperature is maintained within the phase change temperature range.

[0036] Cooling cycle setting: After each heating cycle, turn off the heating device and allow it to cool naturally for 6-7 hours. During the cooling cycle, monitor the temperature change. The internal temperature of the material will gradually drop but will not be lower than room temperature.

[0037] Monitoring and Adjustment: Temperature sensors are used to monitor the temperature inside and on the surface of the material in real time, record temperature data, analyze the temperature changes in each heating and cooling cycle, and adjust the heating time, power and cycle based on the data analysis results to control the temperature within the phase change temperature range.

[0038] Preferably, the initial heating temperature is controlled within the phase transition temperature range with an accuracy of ±2℃.

[0039] Preferably, the maintenance in step S10 specifically includes the following steps:

[0040] Wet maintenance phase (first 7 days):

[0041] Place the demolded sample in a humid curing chamber;

[0042] The temperature range of the wet curing chamber is set to 18-22℃, and the humidity is maintained at 90-100%.

[0043] The sample surface was kept moist for 7 days under continuous wet curing.

[0044] Carbon dioxide curing phase (days 8 to 28):

[0045] After wet curing, the samples were transferred into a carbon dioxide curing chamber.

[0046] The temperature range of the curing chamber is set to 18-22℃, and the carbon dioxide concentration is controlled at 10-20%.

[0047] Perform carbon dioxide curing for 6-10 hours daily, and keep the samples at room temperature for the rest of the time.

[0048] Preferably, the magnetorheological fluid compaction in step S8 specifically includes the following steps:

[0049] Prepare the mold and mixture: Pour the mixture into a mold that has been pre-coated with a layer of magnetorheological fluid;

[0050] Install the electromagnetic coil: Install the electromagnetic coil on the outer wall and bottom of the mold;

[0051] Set the magnetic field parameters: initial magnetic field strength 0.1-0.5T, maximum magnetic field strength 0.5-1T, and magnetic field application time 3-10min;

[0052] Initiating magnetic field compaction: This involves applying different magnetic field intensities in three stages, from low to high, and monitoring the compaction effect of the magnetic field and mixture in real time through a control system, adjusting the magnetic field intensity and application time accordingly.

[0053] Compaction completion and curing:

[0054] After the magnetic field effect ends, the electromagnetic coil is turned off, and the mold is left to stand for initial curing.

[0055] Preferably, the phase change temperature ranges of the phase change materials paraffin and fatty acid are 20-60℃ for paraffin and 30-70℃ for fatty acid, respectively.

[0056] This invention provides a method for preparing ultra-high performance cement-based materials incorporating waste glass powder. It has the following beneficial effects:

[0057] 1. This invention significantly improves the density of materials by using magnetorheological fluid technology for compaction. Under the action of a magnetic field, the rheological properties of the mixture are effectively controlled, air bubbles are eliminated, and the microstructure is more compact. Traditional mechanical vibration cannot achieve the same effect and is prone to generating air bubbles and voids, which affects the density and strength of the material.

[0058] This invention significantly improves the durability of materials through the application of microencapsulated phase change materials and carbon dioxide curing technology. Microencapsulated phase change materials can absorb and release energy when the temperature changes, regulate the internal temperature of the material, and reduce the damage of temperature stress to the material. Carbon dioxide curing technology promotes the formation of a carbonized layer on the surface of the material, improves the material's freeze-thaw resistance and impermeability, thereby extending the service life of the material.

[0059] This invention utilizes microencapsulated phase change materials and environmentally friendly materials such as green and efficient water-reducing agents, making the entire preparation process more energy-efficient and environmentally friendly. Compared with traditional methods, it has significant advantages in reducing energy consumption and pollution, which helps to achieve the goals of green building and sustainable development.

[0060] This invention promotes the formation of a carbonized layer on the surface of materials through the application of carbon dioxide curing technology, which improves the freeze-thaw resistance and impermeability of the materials, significantly improves the durability of the materials, and solves the problem that traditional materials are easily damaged and have poor durability under freeze-thaw cycles and water immersion. Attached Figure Description

[0061] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0062] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0063] Example:

[0064] Please see the appendix Figure 1 This invention provides a method for preparing an ultra-high performance cement-based material incorporating waste glass powder, comprising the following steps:

[0065] S1 provides cement, waste glass powder, silica fume, fine aggregate, nano titanium dioxide, graphene, phase change materials, green and high-efficiency water-reducing agents and steel fibers;

[0066] S2. Graphene is dispersed in deionized water to form a graphene suspension;

[0067] S3. Microencapsulation of phase change materials;

[0068] S4. Dry mix cement, waste glass powder, silica fume, fine aggregate and nano titanium dioxide to form a basic mixture;

[0069] S5. The basic mixture, graphene suspension, and microencapsulated phase change material are wet-mixed in a high-shear mixer until a homogeneous mixture is formed.

[0070] S6. Gradually add green and efficient water-reducing agent during the wet mixing process to adjust the working performance of the mixture;

[0071] S7. Finally, add the steel fibers and continue stirring until the steel fibers are evenly distributed.

[0072] S8. Pour the mixture into a mold and compact it using magnetorheological fluid technology;

[0073] S9. After initial setting, demold the sample and place it in a curing chamber for standard curing.

[0074] S10. During the curing period, the phase change material is periodically heated to release energy and regulate the internal temperature of the material.

[0075] S11. After curing for 28 days, the sample is subjected to high-temperature sintering treatment.

[0076] In step S1, by weight percentage, the following components are used: cement 50-70%, waste glass powder 10-20%, silica fume 5-15%, fine aggregate 10-20%, nano titanium dioxide 1-5%, graphene 0.1-1%, phase change material 1-5%, green high-efficiency water-reducing agent 0.5-2%, and steel fiber 0.5-2%.

[0077] The phase change material can be selected from paraffin wax or fatty acids, and the green and efficient water-reducing agent can be selected from plant-based water-reducing agent, tannic acid or guar gum.

[0078] The specific steps of microencapsulation in step S3 include the following:

[0079] S3.1 Preparation of phase change material solution:

[0080] The solid phase change material is heated to a molten state and then dissolved in an appropriate amount of water or organic solvent to form a homogeneous solution.

[0081] S3.2. Prepare wall material solution:

[0082] Take gelatin and gum arabic, dissolve them separately in warm water at 40-50℃, stir well to form a gelatin-gum arabic composite wall material solution;

[0083] S3.3, Mixing phase change material and wall material solution: Slowly add the phase change material solution dropwise into the wall material solution while stirring, maintaining the temperature at 40-50℃ and the stirring speed at 300-500rpm;

[0084] S3.4 Formation of microcapsules: The temperature of the mixed solution is lowered to 10-15℃, and the mixture is stirred continuously to allow the phase change material to gradually solidify and form microcapsules. The pH value is adjusted to 4.0-4.5 to promote the co-precipitation and encapsulation of the microcapsule wall material.

[0085] S3.5, Solidification and Collection: The formed microcapsules are solidified by freeze drying or spray drying. The dried microcapsules are collected, sieved, and microcapsule phase change materials with uniform particle size are obtained.

[0086] In step S6, the method for adjusting the working properties of the mixture is to test the fluidity and stability of the mixture using slump tests, spread tests, and segregation tests, respectively. The dosage of the water-reducing agent is adjusted based on the test results. The method for adjusting the dosage of the water-reducing agent is as follows:

[0087] If the fluidity is insufficient, the amount of water-reducing agent added should be increased;

[0088] If the mixture segregates, reduce the amount of water-reducing agent or increase the proportion of fine aggregate.

[0089] The periodic heating rule in step S10 is as follows:

[0090] Initial settings:

[0091] The initial heating time is set to 1.5-2 hours, and the material temperature is gradually increased to the phase change temperature of the phase change material. The initial heating temperature is controlled at the high value within the phase change temperature range.

[0092] Heating cycle setting: The heating cycle is set to once every 7.5-8 hours, with each heating cycle lasting 0.5-1 hour. During each heating cycle, the temperature is maintained within the phase change temperature range.

[0093] Cooling cycle setting: After each heating cycle, turn off the heating device and allow it to cool naturally for 6-7 hours. During the cooling cycle, monitor the temperature change. The internal temperature of the material will gradually drop but will not be lower than room temperature.

[0094] Monitoring and Adjustment: Temperature sensors are used to monitor the temperature inside and on the surface of the material in real time, record temperature data, analyze the temperature changes in each heating and cooling cycle, and adjust the heating time, power and cycle based on the data analysis results to control the temperature within the phase change temperature range.

[0095] The initial heating temperature is controlled within the phase transition temperature range with an accuracy of ±2℃.

[0096] The maintenance process in step S10 includes the following steps:

[0097] Wet maintenance phase (first 7 days):

[0098] Place the demolded sample in a humid curing chamber;

[0099] The temperature range of the wet curing chamber is set to 18-22℃, and the humidity is maintained at 90-100%.

[0100] The sample surface was kept moist for 7 days under continuous wet curing.

[0101] Carbon dioxide curing phase (days 8 to 28):

[0102] After wet curing, the samples were transferred into a carbon dioxide curing chamber.

[0103] The temperature range of the curing chamber is set to 18-22℃, and the carbon dioxide concentration is controlled at 10-20%.

[0104] Perform carbon dioxide curing for 6-10 hours daily, and keep the samples at room temperature for the rest of the time.

[0105] The magnetorheological fluid compaction technique in step S8 specifically includes the following steps:

[0106] Prepare the mold and mixture: Pour the mixture into a mold that has been pre-coated with a layer of magnetorheological fluid;

[0107] Install the electromagnetic coil: Install the electromagnetic coil on the outer wall and bottom of the mold;

[0108] Set the magnetic field parameters: initial magnetic field strength 0.1-0.5T, maximum magnetic field strength 0.5-1T, and magnetic field application time 3-10min;

[0109] Initiating magnetic field compaction: This involves applying different magnetic field intensities in three stages, from low to high, and monitoring the compaction effect of the magnetic field and mixture in real time through a control system, adjusting the magnetic field intensity and application time accordingly.

[0110] Compaction completion and curing:

[0111] After the magnetic field effect ends, the electromagnetic coil is turned off, and the mold is left to stand for initial curing.

[0112] The phase change temperature ranges for paraffin and fatty acids are 20-60℃ for paraffin and 30-70℃ for fatty acids, respectively.

[0113] Example 1:

[0114] Material proportions (by weight percentage):

[0115] Cement: 60%

[0116] Waste glass powder: 15%

[0117] Silica fume: 10%

[0118] Fine aggregate: 10%

[0119] Nano titanium dioxide: 2%

[0120] Graphene: 0.5%

[0121] Phase change material (paraffin): 1.5%

[0122] Green and highly efficient water-reducing agent (tannic acid): 0.7%

[0123] Steel fiber: 0.3%

[0124] Implementation steps:

[0125] Materials provided:

[0126] We provide cement, waste glass powder, silica fume, fine aggregate, nano titanium dioxide, graphene, paraffin wax, tannic acid, and steel fiber.

[0127] Preparation of graphene suspension:

[0128] 0.5% graphene was dispersed in deionized water to form a graphene suspension.

[0129] Microencapsulation of phase change materials:

[0130] Paraffin wax is heated to a molten state and then dissolved in an appropriate amount of organic solvent to form a homogeneous solution.

[0131] Dissolve gelatin and gum arabic separately in warm water at 45°C, stir well to form a composite wall material solution.

[0132] The paraffin solution was slowly dripped into the wall material solution while stirring, maintaining the temperature at 45°C and the stirring speed at 400 rpm.

[0133] The temperature of the mixed solution was lowered to 12°C, and the mixture was stirred continuously to adjust the pH to 4.2, thus forming microcapsules.

[0134] The microcapsule paraffin was solidified by freeze-drying, and the dried microcapsule paraffin was collected, sieved, and microcapsule phase change material with uniform particle size was obtained.

[0135] Dry-mixed base mixture:

[0136] Cement, waste glass powder, silica fume, fine aggregate, and nano titanium dioxide are dry-mixed to form a basic mixture.

[0137] Wet-mixed base mixture:

[0138] The base mixture is wet-mixed with the graphene suspension and microencapsulated phase change material in a high-shear mixer until a homogeneous mixture is formed.

[0139] Add green and high-efficiency water-reducing agent:

[0140] During the wet mixing process, tannic acid is gradually added to adjust the working properties of the mixture and ensure that the mixture has good flowability and stability.

[0141] Add steel fiber:

[0142] Finally, add the steel fibers and continue stirring until the steel fibers are evenly distributed.

[0143] Magnetorheological fluid compaction:

[0144] Pour the mixture into a mold that has been pre-coated with a layer of magnetorheological fluid.

[0145] Install an electromagnetic coil with an initial magnetic field strength of 0.3T, a maximum magnetic field strength of 0.7T, and apply the magnetic field for 8 minutes.

[0146] Different magnetic field intensities were applied in three stages, and the compaction effect of the magnetic field and the mixture was monitored in real time.

[0147] Demolding and wet curing after initial setting:

[0148] Demold after initial setting (within 24 hours).

[0149] After demolding, the sample was placed in a wet curing chamber with the temperature set at 20°C and the humidity maintained at 95% for 7 days.

[0150] Carbon dioxide maintenance:

[0151] After wet curing, the samples were transferred into a carbon dioxide curing chamber, with the temperature set at 20°C and the carbon dioxide concentration controlled at 15%. The samples were cured for 8 hours a day, and kept at room temperature for the rest of the time.

[0152] Periodic heating:

[0153] Initial settings: The initial heating time is 2 hours, and the material temperature is gradually increased to the phase transition temperature (55℃) of the phase change material.

[0154] The heating cycle is set to once every 8 hours, with each heating session lasting 1 hour, and the temperature is maintained within the phase change temperature range.

[0155] Cooling cycle setting: After each heating cycle, allow 7 hours of natural cooling, monitor temperature changes, and ensure the temperature does not drop below room temperature.

[0156] High-temperature sintering treatment:

[0157] After 28 days of curing, the samples were subjected to high-temperature sintering treatment at 900℃ for 3 hours.

[0158] Summary of Example 1:

[0159] Through the above steps, an ultra-high performance cement-based material incorporating waste glass powder was prepared. The material was compacted using magnetorheological fluid technology and combined with wet curing and carbon dioxide curing to improve its density and durability.

[0160] Example 2:

[0161] Material proportions (by weight percentage):

[0162] Cement: 65%

[0163] Waste glass powder: 12%

[0164] Silica fume: 10%

[0165] Fine aggregate: 8%

[0166] Nano titanium dioxide: 2%

[0167] Graphene: 1%

[0168] Phase change material (fatty acid): 1.5%

[0169] Green and efficient water-reducing agent (guar gum): 0.5%

[0170] Steel fiber: 0.5%

[0171] Implementation steps:

[0172] Materials provided:

[0173] We provide cement, waste glass powder, silica fume, fine aggregate, nano titanium dioxide, graphene, fatty acids, guar gum, and steel fiber.

[0174] Preparation of graphene suspension:

[0175] 1% graphene was dispersed in deionized water to form a graphene suspension.

[0176] Microencapsulation of phase change materials:

[0177] The fatty acids are heated to a molten state and then dissolved in an appropriate amount of organic solvent to form a homogeneous solution.

[0178] Dissolve gelatin and gum arabic separately in warm water at 45°C, stir well to form a composite wall material solution.

[0179] The fatty acid solution was slowly added dropwise to the wall material solution while stirring, maintaining the temperature at 45°C and the stirring speed at 400 rpm.

[0180] The temperature of the mixed solution was lowered to 12°C, and the mixture was stirred continuously to adjust the pH to 4.2, thus forming microcapsules.

[0181] The microcapsule fatty acids were solidified by freeze-drying, collected after drying, and sieved to obtain microcapsule phase change materials with uniform particle size.

[0182] Dry-mixed base mixture:

[0183] Cement, waste glass powder, silica fume, fine aggregate, and nano titanium dioxide are dry-mixed to form a basic mixture.

[0184] Wet-mixed base mixture:

[0185] The base mixture is wet-mixed with the graphene suspension and microencapsulated phase change material in a high-shear mixer until a homogeneous mixture is formed.

[0186] Add green and high-efficiency water-reducing agent:

[0187] During the wet mixing process, guar gum is gradually added to adjust the working properties of the mixture and ensure that the mixture has good flowability and stability.

[0188] Add steel fiber:

[0189] Finally, add the steel fibers and continue stirring until the steel fibers are evenly distributed.

[0190] Magnetorheological fluid compaction:

[0191] Pour the mixture into a mold that has been pre-coated with a layer of magnetorheological fluid.

[0192] Install an electromagnetic coil with an initial magnetic field strength of 0.4T, a maximum magnetic field strength of 0.8T, and apply the magnetic field for 9 minutes.

[0193] Different magnetic field intensities were applied in three stages, and the compaction effect of the magnetic field and the mixture was monitored in real time.

[0194] Demolding and wet curing after initial setting:

[0195] Demold after initial setting (within 24 hours).

[0196] After demolding, the sample was placed in a wet curing chamber with the temperature set at 20°C and the humidity maintained at 95% for 7 days.

[0197] Carbon dioxide maintenance:

[0198] After wet curing, the samples were transferred into a carbon dioxide curing chamber, with the temperature set at 20°C and the carbon dioxide concentration controlled at 15%. The samples were cured for 8 hours a day, and kept at room temperature for the rest of the time.

[0199] Periodic heating:

[0200] Initial settings: The initial heating time is 1.5 hours, and the material temperature is gradually increased to the phase transition temperature (50°C) of the phase change material.

[0201] The heating cycle is set to once every 7.5 hours, with each heating cycle lasting 0.5 hours, and the temperature is maintained within the phase change temperature range.

[0202] Cooling cycle setting: After each heating cycle, allow 6.5 hours of natural cooling, monitor temperature changes, and ensure the temperature does not drop below room temperature.

[0203] High-temperature sintering treatment:

[0204] After 28 days of curing, the samples were subjected to high-temperature sintering treatment at 850℃ for 3 hours.

[0205] Summary of Example 2:

[0206] Based on Example 1, the material ratio and type of phase change material were adjusted through the above steps. Guar gum was used as a green and efficient water-reducing agent. The compaction parameters of magnetorheological fluid technology and the time setting of periodic heating were optimized, which further improved the performance of the material.

[0207] Example 3:

[0208] Material proportions (by weight percentage):

[0209] Cement: 64%

[0210] Waste glass powder: 12%

[0211] Silica fume: 10%

[0212] Fine aggregate: 9%

[0213] Nano titanium dioxide: 2%

[0214] Graphene: 0.6%

[0215] Phase change material (paraffin): 1.5%

[0216] Green and highly efficient water-reducing agent (tannic acid): 0.7%

[0217] Steel fiber: 0.5%

[0218] Implementation steps:

[0219] Materials provided:

[0220] We provide cement, waste glass powder, silica fume, fine aggregate, nano titanium dioxide, graphene, paraffin wax, tannic acid, and steel fiber.

[0221] Preparation of graphene suspension:

[0222] 0.6% graphene was dispersed in deionized water to form a graphene suspension.

[0223] Microencapsulation of phase change materials:

[0224] Paraffin wax is heated to a molten state and then dissolved in an appropriate amount of organic solvent to form a homogeneous solution.

[0225] Dissolve gelatin and gum arabic separately in warm water at 45°C, stir well to form a composite wall material solution.

[0226] The paraffin solution was slowly dripped into the wall material solution while stirring, maintaining the temperature at 45°C and the stirring speed at 400 rpm.

[0227] The temperature of the mixed solution was lowered to 12°C, and the mixture was stirred continuously to adjust the pH to 4.2, thus forming microcapsules.

[0228] The microcapsule paraffin was solidified by freeze-drying, and the dried microcapsule paraffin was collected, sieved, and microcapsule phase change material with uniform particle size was obtained.

[0229] Dry-mixed base mixture:

[0230] Cement, waste glass powder, silica fume, fine aggregate, and nano titanium dioxide are dry-mixed to form a basic mixture.

[0231] Wet-mixed base mixture:

[0232] The base mixture is wet-mixed with the graphene suspension and microencapsulated phase change material in a high-shear mixer until a homogeneous mixture is formed.

[0233] Add green and high-efficiency water-reducing agent:

[0234] During the wet mixing process, tannic acid is gradually added to adjust the working properties of the mixture and ensure that the mixture has good flowability and stability.

[0235] Add steel fiber:

[0236] Finally, add the steel fibers and continue stirring until the steel fibers are evenly distributed.

[0237] Magnetorheological fluid compaction:

[0238] Pour the mixture into a mold that has been pre-coated with a layer of magnetorheological fluid.

[0239] Install an electromagnetic coil with an initial magnetic field strength of 0.3T, a maximum magnetic field strength of 1T, and apply the magnetic field for 10 minutes.

[0240] Different magnetic field intensities were applied in three stages, and the compaction effect of the magnetic field and the mixture was monitored in real time.

[0241] Demolding and wet curing after initial setting:

[0242] Demold after initial setting (within 24 hours).

[0243] After demolding, the sample was placed in a wet curing chamber with the temperature set at 20°C and the humidity maintained at 95% for 7 days.

[0244] Carbon dioxide maintenance:

[0245] After wet curing, the samples were transferred into a carbon dioxide curing chamber, with the temperature set at 20°C and the carbon dioxide concentration controlled at 15%. The samples were cured for 8 hours a day, and kept at room temperature for the rest of the time.

[0246] Periodic heating:

[0247] Initial settings: The initial heating time is 2 hours, and the material temperature is gradually increased to the phase transition temperature (55℃) of the phase change material.

[0248] The heating cycle is set to once every 8 hours, with each heating session lasting 1 hour, and the temperature is maintained within the phase change temperature range.

[0249] Cooling cycle setting: After each heating cycle, allow 7 hours of natural cooling, monitor temperature changes, and ensure the temperature does not drop below room temperature.

[0250] High-temperature sintering treatment:

[0251] After 28 days of curing, the samples were subjected to high-temperature sintering treatment at 900℃ for 3 hours.

[0252] Summary of Example 3:

[0253] The material ratio was optimized, the compaction parameters of the magnetorheological fluid technology were improved, and the temperature and time settings for periodic heating were further adjusted, which significantly improved the overall performance and durability of the material.

[0254] Example 4:

[0255] Material proportions (by weight percentage):

[0256] Cement: 63%

[0257] Waste glass powder: 14%

[0258] Silica fume: 9%

[0259] Fine aggregate: 9%

[0260] Nano titanium dioxide: 2%

[0261] Graphene: 0.8%

[0262] Phase change material (fatty acid): 1.5%

[0263] Green and efficient water-reducing agent (guar gum): 0.7%

[0264] Steel fiber: 0.3%

[0265] Implementation steps:

[0266] Materials provided:

[0267] We provide cement, waste glass powder, silica fume, fine aggregate, nano titanium dioxide, graphene, fatty acids, guar gum, and steel fiber.

[0268] Preparation of graphene suspension:

[0269] 0.8% graphene was dispersed in deionized water to form a graphene suspension.

[0270] Microencapsulation of phase change materials:

[0271] The fatty acids are heated to a molten state and then dissolved in an appropriate amount of organic solvent to form a homogeneous solution.

[0272] Dissolve gelatin and gum arabic separately in warm water at 45°C, stir well to form a composite wall material solution.

[0273] The fatty acid solution was slowly added dropwise to the wall material solution while stirring, maintaining the temperature at 45°C and the stirring speed at 400 rpm.

[0274] The temperature of the mixed solution was lowered to 12°C, and the mixture was stirred continuously to adjust the pH to 4.2, thus forming microcapsules.

[0275] The microcapsule fatty acids were solidified by freeze-drying, collected after drying, and sieved to obtain microcapsule phase change materials with uniform particle size.

[0276] Dry-mixed base mixture:

[0277] Cement, waste glass powder, silica fume, fine aggregate, and nano titanium dioxide are dry-mixed to form a basic mixture.

[0278] Wet-mixed base mixture:

[0279] The base mixture is wet-mixed with the graphene suspension and microencapsulated phase change material in a high-shear mixer until a homogeneous mixture is formed.

[0280] Add green and high-efficiency water-reducing agent:

[0281] During the wet mixing process, guar gum is gradually added to adjust the working properties of the mixture and ensure that the mixture has good flowability and stability.

[0282] Add steel fiber:

[0283] Finally, add the steel fibers and continue stirring until the steel fibers are evenly distributed.

[0284] Magnetorheological fluid compaction:

[0285] Pour the mixture into a mold that has been pre-coated with a layer of magnetorheological fluid.

[0286] Install an electromagnetic coil with an initial magnetic field strength of 0.5T, a maximum magnetic field strength of 1T, and apply the magnetic field for 10 minutes.

[0287] Different magnetic field intensities were applied in three stages, and the compaction effect of the magnetic field and the mixture was monitored in real time.

[0288] Demolding and wet curing after initial setting:

[0289] Demold after initial setting (within 24 hours).

[0290] After demolding, the sample was placed in a wet curing chamber with the temperature set at 20°C and the humidity maintained at 95% for 7 days.

[0291] Carbon dioxide maintenance:

[0292] After wet curing, the samples were transferred into a carbon dioxide curing chamber, with the temperature set at 20°C and the carbon dioxide concentration controlled at 15%. The samples were cured for 8 hours a day, and kept at room temperature for the rest of the time.

[0293] Periodic heating:

[0294] Initial settings: The initial heating time is 1.5 hours, and the material temperature is gradually increased to the phase transition temperature (50°C) of the phase change material.

[0295] The heating cycle is set to once every 7.5 hours, with each heating cycle lasting 0.5 hours, and the temperature is maintained within the phase change temperature range.

[0296] Cooling cycle setting: After each heating cycle, allow 6.5 hours of natural cooling, monitor temperature changes, and ensure the temperature does not drop below room temperature.

[0297] High-temperature sintering treatment:

[0298] After 28 days of curing, the samples were subjected to high-temperature sintering treatment at 850℃ for 3 hours.

[0299] Summary of Example 4:

[0300] Based on Example 3, the material ratio and the type of phase change material were optimized. Guar gum was used as a green and efficient water-reducing agent. The compaction parameters of magnetorheological fluid technology and the temperature setting of periodic heating were further optimized, which significantly improved the overall performance and durability of the material.

[0301] Summary:

[0302] These four embodiments, based on Embodiment 1, progressively adjust the material ratios and types of phase change materials, optimize the compaction parameters of magnetorheological fluid technology, improve the conditions for wet curing and carbon dioxide curing, and optimize the temperature and time settings for periodic heating. Each embodiment further develops upon the previous one, demonstrating the impact of different material combinations and process parameters on material properties. Ultimately, through these optimization measures, the density, fluidity, stability, durability, and overall performance of the ultra-high performance cementitious material incorporating waste glass powder are significantly improved, meeting the demanding requirements of engineering applications.

[0303] Experimental Design:

[0304] Experimental objective:

[0305] The method for preparing ultra-high performance cement-based materials by incorporating waste glass powder was verified to demonstrate its improvements and advantages over traditional methods in terms of density, fluidity, stability, durability, and overall performance.

[0306] Experimental Design:

[0307] The experimental comparison scheme includes:

[0308] Traditional preparation methods

[0309] Embodiment 1 of the present invention

[0310] Embodiment 2 of the present invention

[0311] Embodiment 3 of the present invention

[0312] Embodiment 4 of the present invention

[0313] Experimental steps:

[0314] 1. Material preparation:

[0315] Traditional preparation methods:

[0316] Cement, waste glass powder, silica fume, fine aggregate, steel fiber, and water-reducing agent.

[0317] Embodiments of the present invention:

[0318] Cement, waste glass powder, silica fume, fine aggregate, nano titanium dioxide, graphene, phase change materials (paraffin / fatty acids), green and high-efficiency water-reducing agents (tannic acid / guar gum / plant-based water-reducing agents), and steel fibers.

[0319] Material proportions:

[0320] Prepare the materials according to the weight percentages specified in their respective embodiments and conventional methods.

[0321] Mixing and stirring:

[0322] Traditional method: Use ordinary mixing equipment to mix and ensure uniformity.

[0323] Method of the present invention:

[0324] Preparation of graphene suspension and microencapsulation of phase change materials.

[0325] Dry-mixed base material, wet-mixed base material, with added water-reducing agent and steel fiber.

[0326] Use a high-shear mixer to mix until a homogeneous mixture is formed.

[0327] Mold filling and compaction:

[0328] Traditional method: The mixture is poured into a mold and compacted using mechanical vibration.

[0329] The method of this invention involves pouring the mixture into a mold and compacting it using magnetorheological fluid technology.

[0330] Maintenance:

[0331] Traditional method: Regular wet maintenance for 28 days.

[0332] Method of the present invention:

[0333] Demold after initial setting, and perform wet curing for the first 7 days.

[0334] Carbon dioxide maintenance was carried out from day 8 to day 28.

[0335] Periodic heating is applied during the curing period.

[0336] After 28 days of curing, high-temperature sintering is carried out.

[0337] Test items:

[0338] Density (porosity)

[0339] Liquidity (collapse, expansion)

[0340] Stability (segregation test)

[0341] Durability (freeze-thaw resistance, water penetration resistance)

[0342] Strength (compressive strength)

[0343] Sample number method Porosity (%) Slump (mm) Expansion (mm) Separation rate (%) Freeze-thaw cycle count Permeability resistance depth (mm) Compressive strength (MPa) Traditional methods T 15.2 180 500 5.8 25 22 80 Example 1 E1 9.8 210 560 2.3 60 15 120 Example 2 E2 9.5 215 570 2.1 65 14 125 Example 3 E3 9.2 225 580 1.8 75 12 135 Example 4 E4 9.1 230 585 1.5 80 11 140

[0344] Summarize:

[0345] By comparing traditional preparation methods with four embodiments of the present invention, the performance of different methods in terms of density, flowability, stability, durability, and strength was comprehensively evaluated. Experimental data are shown in Table 1, and detailed analysis follows:

[0346] Density (porosity):

[0347] The porosity of the sample prepared by the conventional method is 15.2%, which is significantly higher than the porosity of the embodiments of the present invention.

[0348] The porosity of all embodiments of the present invention is less than 10%. With the optimization of the process, the porosity gradually decreases, and the lowest value of 9.1% is reached in Embodiment 4.

[0349] Liquidity (collapse, expansion):

[0350] The slump and spread of the traditional method are 180 mm and 500 mm, respectively.

[0351] The slump and spread of each embodiment of the present invention are significantly improved. The slump and spread of Embodiment 4 reach 230 mm and 585 mm, respectively, indicating that the material has better fluidity.

[0352] Stability (segregation rate):

[0353] The separation rate of the traditional method is 5.8%, which is significantly higher than that of the embodiments of the present invention.

[0354] The segregation rates of all embodiments of the present invention are less than 2.5%, with the lowest segregation rate in Embodiment 4 being only 1.5%, indicating that the materials are mixed more uniformly and have better stability.

[0355] Durability (freeze-thaw resistance, water penetration resistance):

[0356] Samples prepared by traditional methods can only withstand 25 freeze-thaw cycles and have a penetration depth of 22 mm.

[0357] The number of freeze-thaw cycles in each embodiment of the present invention is significantly improved, reaching 80 cycles in Embodiment 4.

[0358] The anti-permeability depth of each embodiment of the present invention is significantly reduced. The anti-permeability depth of Embodiment 4 is only 11 mm, indicating that the durability of the material is significantly improved.

[0359] Strength (compressive strength):

[0360] The compressive strength of the sample prepared by the traditional method is 80 MPa.

[0361] The compressive strength of each embodiment of the present invention is significantly higher than that of the traditional method, with the highest value of 140 MPa achieved in embodiment four.

[0362] Summary

[0363] Experimental results clearly show that the method of this invention is superior to the traditional method in all performance indicators, specifically as follows:

[0364] The density is significantly improved, and the porosity is greatly reduced.

[0365] Liquidity has improved significantly, with a marked increase in collapse and expansion.

[0366] Stability is significantly improved and segregation rate is significantly reduced.

[0367] Durability is significantly enhanced, with a substantial improvement in resistance to freeze-thaw cycles and impermeability.

[0368] The strength is significantly improved, and the compressive strength is greatly increased.

[0369] In the previous experiment, by comparing the traditional preparation method with the method of the present invention, the significant advantages of the present invention in terms of material density, flowability, stability, durability, and overall performance were verified. Experimental results show that the method of the present invention, employing magnetorheological fluid technology, microencapsulated phase change materials, and carbon dioxide curing technology, possesses significant innovation and superiority in improving material performance and environmental friendliness.

[0370] To further investigate the influence of different process parameters on material properties using the method of this invention, this experiment not only compared the effects of different magnetic field strengths, different phase change materials, and different curing conditions on material properties, but also further analyzed the optimization effect of these parameter combinations in practical applications. Through in-depth research on these key parameters, the applicability and superiority of the method of this invention under different conditions are comprehensively evaluated, providing a more scientific and comprehensive basis for the future development of high-performance cement-based materials.

[0371] Experimental Design:

[0372] Experimental objective:

[0373] The performance of the ultra-high performance cement-based material preparation method of the present invention under different process parameters was investigated in depth.

[0374] Experimental Design:

[0375] The experimental comparison scheme includes:

[0376] Traditional preparation methods:

[0377] The method of this invention (standard process parameters)

[0378] The method of this invention (with different magnetic field strengths)

[0379] Method of the present invention (for different phase change materials)

[0380] Methods of this invention (under different maintenance conditions)

[0381] Experimental steps:

[0382] 1. Material preparation

[0383] Traditional preparation methods:

[0384] Cement, waste glass powder, silica fume, fine aggregate, steel fiber, and water-reducing agent.

[0385] Method of the present invention:

[0386] Cement, waste glass powder, silica fume, fine aggregate, nano titanium dioxide, graphene, phase change materials (paraffin / fatty acids), green and high-efficiency water-reducing agents (tannic acid / guar gum / plant-based water-reducing agents), and steel fibers.

[0387] Material proportions:

[0388] Prepare the materials according to the weight percentages specified in their respective embodiments and conventional methods.

[0389] Mixing and stirring:

[0390] Traditional method: Use ordinary mixing equipment to mix and ensure uniformity.

[0391] Method of the present invention:

[0392] Preparation of graphene suspension and microencapsulation of phase change materials.

[0393] Dry-mixed base material, wet-mixed base material, with added water-reducing agent and steel fiber.

[0394] Use a high-shear mixer to mix until a homogeneous mixture is formed.

[0395] Mold filling and compaction:

[0396] Traditional method: The mixture is poured into a mold and compacted using mechanical vibration.

[0397] The method of this invention involves pouring the mixture into a mold and compacting it using magnetorheological fluid technology.

[0398] Maintenance:

[0399] Traditional method: Regular wet maintenance for 28 days.

[0400] Method of the present invention:

[0401] Demold after initial setting, and perform wet curing for the first 7 days.

[0402] Carbon dioxide maintenance was carried out from day 8 to day 28.

[0403] Periodic heating is applied during the curing period.

[0404] After 28 days of curing, high-temperature sintering is carried out.

[0405] Experimental parameter settings:

[0406] Different magnetic field strengths: 0.3T, 0.5T, 0.7T, 0.9T

[0407] Different phase change materials: paraffin, fatty acids

[0408] Different maintenance conditions: wet maintenance (28 days), CO2 maintenance (7 days of wet maintenance + 21 days of CO2 maintenance)

[0409] 7. Test items:

[0410] Density (porosity)

[0411] Liquidity (collapse, expansion)

[0412] Stability (segregation test)

[0413] Durability (freeze-thaw resistance, water penetration resistance)

[0414] Strength (compressive strength)

[0415] Sample number method Magnetic field strength (T) Phase change materials Maintenance conditions Porosity (%) Slump (mm) Expansion (mm) Separation rate (%) Freeze-thaw cycle count Permeability resistance depth (mm) Compressive strength (MPa) Traditional methods T - - Moist care 15.2 180 500 5.8 25 22 80 Standard process E1 0.5 paraffin carbon dioxide 9.8 210 560 2.3 60 15 120 Magnetic field 0.3T E2 0.3 paraffin carbon dioxide 10.1 200 550 2.6 55 17 115 Magnetic field 0.7T E3 0.7 paraffin carbon dioxide 9.5 215 570 2.1 65 14 125 Magnetic field 0.9T E4 0.9 paraffin carbon dioxide 9.3 220 575 2.0 70 13 130 fatty acid E5 0.5 fatty acid carbon dioxide 9.6 212 562 2.4 62 16 118 28 days of wet care E6 0.5 paraffin Moist care 10.2 205 555 2.7 50 18 110

[0416] Experiment Summary:

[0417] By comparing the experimental results, the inventiveness and superiority of the preparation method of this invention were further verified. Specifically, the results are as follows:

[0418] Influence of magnetic field strength:

[0419] As the magnetic field strength increases, the porosity gradually decreases and the material density increases.

[0420] The material exhibits optimal fluidity and stability at magnetic field strengths of 0.7T and 0.9T.

[0421] Freeze-thaw resistance and impermeability are significantly improved under higher magnetic field strength.

[0422] Different phase change materials:

[0423] Using paraffin and fatty acids as phase change materials significantly improves the material's performance.

[0424] Paraffin and fatty acid phase change materials exhibit excellent flowability and stability.

[0425] Different maintenance conditions:

[0426] Carbon dioxide curing is significantly superior to traditional wet curing, especially in terms of durability.

[0427] Samples cured in wet conditions for 28 days showed inferior compressive strength and freeze-thaw resistance compared to samples cured in carbon dioxide.

[0428] The above results further demonstrate the significant advantages of the innovative processes employed in this invention, such as magnetorheological fluid technology, microencapsulated phase change materials, carbon dioxide curing, and periodic heating, in improving material performance.

[0429] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing an ultra-high performance cement-based material incorporating waste glass powder, characterized in that, Includes the following steps: S1 provides cement, waste glass powder, silica fume, fine aggregate, nano titanium dioxide, graphene, phase change materials, green and high-efficiency water-reducing agents and steel fibers; S2. Graphene is dispersed in deionized water to form a graphene suspension; S3. Microencapsulation of phase change materials; The specific steps of the microencapsulation process in step S3 include the following: S3.1 Preparation of phase change material solution: The solid phase change material is heated to a molten state and then dissolved in an appropriate amount of water or organic solvent to form a homogeneous solution. S3.

2. Prepare wall material solution: Take gelatin and gum arabic, dissolve them separately in warm water at 40-50℃, stir well to form a gelatin-gum arabic composite wall material solution; S3.3, Mixing phase change material and wall material solution: Slowly add the phase change material solution dropwise into the wall material solution while stirring, maintaining the temperature at 40-50℃ and the stirring speed at 300-500rpm; S3.4 Formation of microcapsules: The temperature of the mixed solution is lowered to 10-15℃, and the mixture is stirred continuously to allow the phase change material to gradually solidify and form microcapsules. The pH value is adjusted to 4.0-4.5 to promote the co-precipitation and encapsulation of the microcapsule wall material. S3.5, Solidification and Collection: The formed microcapsules are solidified by freeze drying or spray drying, and the dried microcapsules are collected, sieved, and microcapsule phase change materials with uniform particle size are obtained. S4. Dry mix cement, waste glass powder, silica fume, fine aggregate and nano titanium dioxide to form a basic mixture; S5. The basic mixture, graphene suspension, and microencapsulated phase change material are wet-mixed in a high-shear mixer until a homogeneous mixture is formed. S6. Gradually add green and efficient water-reducing agent during the wet mixing process to adjust the working performance of the mixture; S7. Finally, add the steel fibers and continue stirring until the steel fibers are evenly distributed. S8. Pour the mixture into a mold and compact it using magnetorheological fluid technology; S9. After initial setting, demold the sample and place it in a curing chamber for standard curing. S10. During the curing period, the phase change material is heated periodically to release energy and regulate the internal temperature of the material. The curing includes carbon dioxide curing. S11. After curing for 28 days, the sample is subjected to high-temperature sintering treatment.

2. The method for preparing an ultra-high performance cement-based material incorporating waste glass powder according to claim 1, characterized in that, In step S1, by weight percentage, the following components are used: cement 50-70%, waste glass powder 10-20%, silica fume 5-15%, fine aggregate 10-20%, nano titanium dioxide 1-5%, graphene 0.1-1%, phase change material 1-5%, green high-efficiency water-reducing agent 0.5-2%, and steel fiber 0.5-2%.

3. The method for preparing an ultra-high performance cement-based material incorporating waste glass powder according to claim 1, characterized in that, The phase change material is selected from paraffin wax and fatty acids, and the green high-efficiency water-reducing agent is selected from plant-based water-reducing agent, tannic acid or guar gum.

4. The method for preparing an ultra-high performance cement-based material incorporating waste glass powder according to claim 1, characterized in that, The method for adjusting the working performance of the mixture in step S6 is to test the fluidity and stability of the mixture using slump test, spread test and segregation test respectively, and adjust the dosage of water-reducing agent according to the test results. The method for adjusting the dosage of water-reducing agent is as follows: If the fluidity is insufficient, the amount of water-reducing agent added should be increased; If the mixture segregates, reduce the amount of water-reducing agent or increase the proportion of fine aggregate.

5. The method for preparing an ultra-high performance cement-based material incorporating waste glass powder according to claim 1, characterized in that, The periodic heating rule in step S10 is as follows: Initial settings: The initial heating time is set to 1.5-2 hours, and the material temperature is gradually increased to the phase change temperature of the phase change material. The initial heating temperature is controlled at the high value within the phase change temperature range. Heating cycle setting: The heating cycle is set to once every 7.5-8 hours, with each heating cycle lasting 0.5-1 hour. During each heating cycle, the temperature is maintained within the phase change temperature range. Cooling cycle setting: After each heating cycle, turn off the heating device and allow it to cool naturally for 6-7 hours. During the cooling cycle, monitor the temperature change. The internal temperature of the material will gradually drop but will not be lower than room temperature. Monitoring and Adjustment: Temperature sensors are used to monitor the temperature inside and on the surface of the material in real time, record temperature data, analyze the temperature changes in each heating and cooling cycle, and adjust the heating time, power and cycle based on the data analysis results to control the temperature within the phase change temperature range.

6. The method for preparing an ultra-high performance cement-based material incorporating waste glass powder according to claim 5, characterized in that, The initial heating temperature is controlled within the phase transition temperature range with an accuracy of ±2℃.

7. The method for preparing an ultra-high performance cement-based material incorporating waste glass powder according to claim 1, characterized in that, The maintenance process in step S10 specifically includes the following steps: The first 7 days are the wet maintenance phase: Place the demolded sample in a humid curing chamber; The temperature range of the wet curing chamber is set to 18-22℃, and the humidity is maintained at 90-100%. The sample surface was kept moist for 7 days under continuous wet curing. Days 8 to 28 are the carbon dioxide curing phase: After wet curing, the samples were transferred into a carbon dioxide curing chamber. The temperature range of the curing chamber is set to 18-22℃, and the carbon dioxide concentration is controlled at 10-20%. Perform carbon dioxide curing for 6-10 hours daily, and keep the samples at room temperature for the rest of the time.

8. The method for preparing an ultra-high performance cement-based material incorporating waste glass powder according to claim 1, characterized in that, The magnetorheological fluid compaction technique in step S8 specifically includes the following steps: Prepare the mold and mixture: Pour the mixture into a mold that has been pre-coated with a layer of magnetorheological fluid; Install the electromagnetic coil: Install the electromagnetic coil on the outer wall and bottom of the mold; Set the magnetic field parameters: initial magnetic field strength 0.1-0.5T, maximum magnetic field strength 0.5-1T, and magnetic field application time 3-10min; Initiating magnetic field compaction: This involves applying different magnetic field intensities in three stages, from low to high, and monitoring the compaction effect of the magnetic field and mixture in real time through a control system, adjusting the magnetic field intensity and application time accordingly. Compaction completion and curing: After the magnetic field effect ends, the electromagnetic coil is turned off, and the mold is left to stand for initial curing.

9. The method for preparing an ultra-high performance cement-based material incorporating waste glass powder according to claim 3, characterized in that, The phase change temperature ranges for the phase change materials paraffin and fatty acids are 20-60℃ for paraffin and 30-70℃ for fatty acids, respectively.

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