Conductive fiber reinforced self-sensing seamless terrace concrete material and preparation method thereof

Abstract

The invention relates to the field of self-sensing seamless terrace concrete, in particular to a conductive fiber reinforced self-sensing seamless terrace concrete material and a preparation method thereof. The invention relates to a conductive fiber reinforced self-sensing seamless terrace concrete material, which comprises: 300-350 parts of cement; 1600 to 1800 parts of an aggregate; 80 to 120 parts of a mineral admixture; 0.8 to 1.2 parts of conductive fiber; 2-3 parts of a polyether dispersant; 100 to 110 parts of water; the conductive fiber comprises a polyacrylonitrile-based carbon fiber core layer with a diameter of 6-8 [mu] m and a coating layer coated with carbon nanotube fluff. According to the application, a binary structure of the core layer and the coating layer of the conductive fiber is designed, the polyacrylonitrile-based carbon fiber core layer is used for providing mechanical reinforced support, the carbon nanotube fluff coating layer is used for constructing a continuous conductive path, and in cooperation with scientific compatibility of basic components such as cement and aggregate, preliminary synergy of mechanical properties and conductive properties is realized. The material has a self-sensing function and meets the basic engineering requirements of seamless terraces at the same time.

Description

Technical Field

[0001] This invention relates to the field of self-sensing seamless concrete flooring, specifically to a conductive fiber reinforced self-sensing seamless concrete flooring material and its preparation method. Background Technology

[0002] In industrial plants, transportation hubs, and other engineering fields, seamless flooring is increasingly in demand due to its advantages such as strong integrity, good crack resistance, and low maintenance costs. Meanwhile, to achieve real-time monitoring of the structural health of flooring, the integration of self-sensing technology with seamless flooring has become a technological trend, leading to the development of conductive fiber-reinforced concrete as a core material.

[0003] However, existing technologies have many problems that urgently need to be solved: First, traditional conductive fibers are mostly single-structured, with insufficient interfacial bonding with the concrete matrix, and the conductive network is prone to breakage due to agglomeration or cracks, resulting in low self-sensing accuracy and poor stability; Second, large-area seamless casting requires concrete with good workability and retarding effect, but traditional retarders are prone to adsorption reactions with conductive fibers and conductive fillers, destroying the conductive network structure and causing a significant decrease in sensing accuracy, forming the core contradiction between construction requirements and sensing performance; Third, microcracks generated during concrete shrinkage can easily sever conductive pathways, and existing materials lack effective self-repair mechanisms for the conductive network, making it difficult to ensure sensing stability during long-term use; Fourth, the preparation of functional materials such as conductive fibers and retarding components lacks coordinated design with the overall concrete preparation process, resulting in the inability of each component to fully exert its function, and the difficulty in simultaneously achieving the required mechanical and self-sensing performance standards. Summary of the Invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a conductive fiber reinforced self-sensing seamless floor concrete material and its preparation method.

[0005] A conductive fiber-reinforced self-sensing seamless concrete flooring material and its preparation method are disclosed, employing the following technical solution: In the first aspect, this application discloses a conductive fiber-reinforced self-sensing seamless concrete flooring material using the following technical solution: A conductive fiber reinforced self-sensing seamless concrete flooring material includes: 300-350 parts of cement; The composition includes 1600-1800 parts of aggregate; 80-120 parts of mineral admixture; 0.8-1.2 parts of conductive fiber; 2-3 parts of polyether dispersant; and 100-110 parts of water. The conductive fiber comprises a polyacrylonitrile-based carbon fiber core layer with a diameter of 6-8 μm and a coating layer covered with carbon nanotube fibers.

[0006] Through the above technical solution, this application constructs a basic material system for conductive fiber-reinforced self-sensing seamless concrete flooring. By designing a binary structure of a conductive fiber core and a coating layer, with a polyacrylonitrile-based carbon fiber core providing mechanical reinforcement and a carbon nanotube fluff coating layer constructing a continuous conductive pathway, and with the scientific formulation of basic components such as cement and aggregates, preliminary synergy between mechanical and conductive properties is achieved. This solution solves the problem of traditional concrete lacking an effective conductive reinforcement structure, enabling the material to possess self-sensing functionality while meeting the basic engineering requirements of seamless flooring. It provides a stable foundational framework for the subsequent addition of functional components and structural optimization, laying the core architecture of the overall technical solution.

[0007] Furthermore, the conductive fiber also includes a polylactic acid-polyethylene glycol block copolymer interlayer.

[0008] Furthermore, the conductive fiber is manufactured using the following technical solution: Polyacrylonitrile-based carbon fibers are placed in a plasma etching device for etching treatment; coaxial electrospinning technology is used, with the core layer being pretreated carbon fibers and the shell layer being polylactic acid-polyethylene glycol block copolymer. The spinning voltage is 15-20kV, the receiving distance is 15-20cm, and the feed rate is 1.0mL / h, forming an intermediate layer with a thickness of 8-12μm. The conductive fiber is prepared by immersing the fiber coated with the intermediate layer in a carbon nanotube dispersion, adding a coupling agent, reacting at a constant temperature of 55-60℃ for 3-5 hours, and then washing and drying.

[0009] Through the above technical solution, this application optimizes the conductive fiber structure by introducing a polylactic acid-polyethylene glycol block copolymer interlayer, forming a three-level structure of core layer, interlayer, and coating layer. The interlayer improves the interfacial bonding between the carbon fiber core and the carbon nanotube coating layer. This design solves the problems of weak interfacial bonding and limited functionality in binary conductive fibers, ensuring the mechanical strength, conductivity, and interfacial compatibility of the conductive fibers. It also enables the precise implementation of the designed three-level structure, providing process support for improving the overall performance of the material.

[0010] Furthermore, the conductive fiber reinforced self-sensing seamless floor concrete material also includes 5-8 parts by weight of temperature-controlled retarding microcapsules. The wall material of the temperature-controlled retarding microcapsules is polylactic acid-chitosan copolymer, the core material is citric acid retarder, and the wall material is doped with 5-8% nano-temperature-controlled particles. The critical response temperature is 25-30℃. Through the above technical solution, this application utilizes the coating effect of polylactic acid-chitosan copolymer wall material and the temperature response characteristics of nano-temperature-controlled particles to achieve precise controlled release of the retarder. During the casting stage, the retarder is locked in to prevent adsorption with conductive components, and released during the critical hydration stage to meet the requirements of seamless casting. This solution directly addresses the core pain point of the conflict between traditional retarders and conductive components, resolving the contradiction between the retarding performance required for seamless casting and the conductive stability required for self-sensing. It achieves synergistic compatibility between construction requirements and material functions, significantly improving the practicality and innovation of the solution.

[0011] Furthermore, the temperature-controlled slow-release microcapsules are manufactured using the following technical solution: Chitosan solution and polylactic acid dichloromethane solution were stirred and mixed, and nano-temperature-controlled particles were added. The mixture was then ultrasonically dispersed and the dispersion slurry was collected. After mixing citric acid retarder and anhydrous ethanol, the mixture was collected and added to the dispersion slurry. The mixture was sheared and emulsified for 5-8 minutes to obtain a composite emulsion. Add glutaraldehyde crosslinking agent to the composite emulsion, heat in a water bath at 40-50℃, remove the solvent by rotary evaporation, and then spray dry to prepare the temperature-controlled slow-release microcapsules.

[0012] Through the above technical solution, this application achieves uniform distribution of temperature-controlled nanoparticles in the wall material via ultrasonic dispersion, forms a stable core-wall structure using shear emulsification, and ensures the morphological integrity and functional stability of the microcapsules through cross-linking curing and spray drying. This solves the problems of low core material encapsulation rate and inaccurate temperature response during microcapsule preparation, ensuring that the microcapsules can exist stably in the concrete system and accurately release the retarder at a preset temperature, thus ensuring the synergistic effect of retarding and conductivity.

[0013] Furthermore, the nano-temperature control particles include either vanadium dioxide nanoparticles or barium titanate nanoparticles with a particle size of 20-30 nm.

[0014] Through the above technical solution, this application clarifies the specific type of nano-temperature-controlled particles, selecting nanoparticles with stable temperature response characteristics and suitability for the alkaline environment of concrete to ensure that they can accurately trigger the swelling and densification transformation of the microcapsule wall material. This solves the problems of unstable performance and large temperature deviation of nano-temperature-controlled particles, ensuring the accuracy and reliability of the microcapsule temperature response, and enabling precise matching of the release timing of the retarder with the concrete hydration process and the function of the conductive fibers. This further enhances the synergistic effect of each component and improves the stability and repeatability of the entire technical solution.

[0015] Furthermore, the conductive fiber reinforced self-sensing seamless floor concrete material also includes 15-20 parts by weight of self-healing conductive microspheres. The self-healing conductive microspheres are epoxy resin wall material and carbon black / nano aluminum powder core material, with a wall material to core material mass ratio of 1:3 and a carbon black to nano aluminum powder mass ratio of 2:1. The microsphere particles have a particle size of 100-200μm.

[0016] Through the above technical solution, this application utilizes the stress sensitivity of epoxy resin wall materials to rupture when shrinkage stress or microcracks occur in concrete, releasing the internal carbon black and nano-aluminum powder composite conductive filler and reconstructing the damaged conductive network. This solves the problem of conductive path breakage and sensing performance failure caused by concrete shrinkage or cracking, achieving active self-repair of the conductive network, significantly improving the long-term stability of the material's self-sensing performance, enabling the material to maintain accurate monitoring functions during long-term use, and expanding the application life and applicable scenarios of the technical solution.

[0017] Secondly, this application discloses a method for preparing a conductive fiber-reinforced self-sensing seamless concrete flooring material, employing the following technical solution: A method for preparing a conductive fiber-reinforced self-sensing seamless floor concrete material includes the following preparation steps: First, put cement, aggregate, and mineral admixture into a mixer and dry mix for 2 minutes. Then, add water and polyether dispersant, stir, and then add temperature-controlled retarding microcapsules and self-healing conductive microspheres. Stir at 600-800 r / min for 1-3 minutes. Finally, add conductive fibers and stir at a low speed of 300-600 r / min for 1-2 minutes. The mixed concrete is placed in an ultrasonic generator with a frequency of 25-45kHz and a power of 200-300W, and an electromagnetic directional device with a weak magnetic field of 0.1-0.15T. The pouring speed is controlled at 0.5~0.8m3 / min. After pouring, the concrete is cured under temperature control for 14 days. The stress-resistance signal of the floor is calibrated at 24h, 48h and 72h after pouring to establish the initial reference value. The conductive fiber reinforced self-sensing seamless floor concrete material can then be prepared.

[0018] Through the above technical solutions, this application optimizes the stirring sequence to ensure uniform dispersion of each component, employs a composite process of ultrasonic induction and electromagnetic orientation to optimize the conductive network distribution, and combines temperature-controlled curing and early sensor calibration to ensure stable performance. This process takes into account the characteristics of the material components and construction requirements, solving problems such as uneven mixing of multifunctional components, disordered conductive network distribution, and unclear sensing benchmarks. It achieves full-process synergy from material preparation to molding and curing, ensuring the simultaneous realization of multiple functions such as mechanical reinforcement, seamless molding, self-sensing, and self-repair, making the technical solution feasible for engineering implementation.

[0019] Furthermore, the 14-day temperature-controlled curing period is as follows: within 0-6 hours of curing, adjust the curing temperature to 20-22℃ and the humidity to ≥90%; within 6-24 hours of curing, adjust the curing temperature to 25-28℃ and the humidity to ≥90%; after 24 hours of curing, return to room temperature curing and maintain humidity to ≥80%.

[0020] Through the above technical solution, this application regulates the curing temperature and humidity in stages according to the concrete hydration process and the response characteristics of functional components. In the initial stage, it inhibits the premature release of retarder; in the middle stage, it promotes the synergistic effect of hydration and retarding; and in the later stage, it ensures stable strength. This solves the problem that traditional curing processes cannot adapt to the synergistic needs of multifunctional components, coordinates the hydration reaction rate, the retarder release rhythm, and the conductive network formation process, effectively avoids cracks caused by temperature stress, and further improves the mechanical properties, seamless forming effect, and stability of self-sensing accuracy of the material, providing key process guarantees for the final implementation of the technical solution.

[0021] In summary, this application has the following beneficial effects: First, this application innovatively designs a synergistic system of three-tiered conductive fibers and temperature-controlled retarded microcapsules. Leveraging the temperature-response characteristics of the nano-temperature-controlled particles in the microcapsule wall material, the retarder is locked in during the mixing and pouring stages, completely preventing contact with conductive components. The retarder is precisely released during the critical stage of concrete hydration, ensuring the workability and setting time required for seamless pouring. Simultaneously, the conductive fiber intermediate layer and the microcapsules utilize the same temperature-controlled material, achieving synchronized temperature response and further enhancing the synergistic effect. This successfully solves the core pain point in traditional technologies where the retarding requirement and the stability of conductive sensing are mutually constrained, enabling the material to maintain a stable conductive path and self-sensing performance while meeting the requirements for large-area seamless molding.

[0022] Secondly, this application ensures the stability of the conductive network through a dual design: on the one hand, the three-tiered conductive fiber structure provides mechanical support with a carbon fiber core layer, optimizes interface bonding in the middle layer, and constructs a dense and continuous conductive pathway with an outer layer of carbon nanotube fibers, enhancing the conductive network's resistance to damage; on the other hand, the newly added self-healing conductive microspheres, when the concrete generates shrinkage stress or microcracks, will cause the wall material to rupture as the cracks expand, releasing the internal composite conductive filler, which overlaps with the carbon nanotube fibers of the conductive fiber, quickly reconstructing the damaged conductive pathway. Combined with ultrasonic induction and electromagnetic orientation processes during pouring to optimize the distribution of conductive components, and early sensing calibration to establish benchmark values, this effectively solves the problems of uneven sensing signals and easy failure due to cracks in traditional materials, enabling the material to maintain a precise stress-resistance response relationship during long-term use and significantly extending the effective lifespan of the self-sensing function.

[0023] Third, this application achieves multi-functional unification through structural innovation and process synergy: the three-level structural design of conductive fibers provides mechanical reinforcement in the core layer, optimizes compatibility in the middle layer, and ensures conductivity in the outer layer, forming a mechanical-chemical dual bond with the concrete matrix, simultaneously improving the material's compressive strength, tensile strength, and conductive stability; the complementary functions of temperature-controlled retarded microcapsules, self-healing conductive microspheres, and conductive fibers construct an integrated system of "retarded release-conductive sensing-crack self-healing"; the overall preparation process is based on improvements to existing engineering equipment, and the mixing sequence, pouring method, and segmented curing are all adapted to actual construction scenarios, eliminating the need for specialized large-scale equipment. This solution not only solves the limitations of traditional materials with single functions and mutually exclusive properties, but also lowers the threshold for large-scale application through mature and feasible process design, enabling the material to possess excellent mechanical properties, stable self-sensing function, and good engineering adaptability, making it suitable for various large-span, high-requirement flooring projects. Detailed Implementation

[0024] The present application will be further described in detail below with reference to the embodiments.

[0025] Preparation Example 1 Conductive fiber 1 Polyacrylonitrile-based carbon fibers with a diameter of 6μm were selected, cut into short fibers of 5mm in length, placed in a plasma etching device, and the etching power was set to 200W and the etching time to 5min. After etching, the fibers were removed, rinsed three times with anhydrous ethanol, and dried in a vacuum drying oven at 60℃ for 12h for later use.

[0026] Weigh 3g of multi-walled carbon nanotubes with a diameter of 10-20nm and a length of 5-10μm, add 100mL of deionized water, and then add 0.3g of polyethylene glycol with a molecular weight of 8000 as a dispersant. First, stir at 1500r / min for 30min, and then use a 300W ultrasonic generator to ultrasonically disperse for 40min to form a stable 3wt% carbon nanotube dispersion. The pretreated carbon fibers were added to the above dispersion, and then 2% of the carbon fiber mass of coupling agent KH-560 was added. After stirring evenly, the mixture was transferred to a constant temperature water bath, and the temperature was set at 55℃. The mixture was kept at a constant temperature for 3 hours, and stirred once every 30 minutes for 5 minutes each time.

[0027] After the reaction was completed, the fibers were collected by filtration, washed with deionized water until the filtrate was clear, and dried in a vacuum drying oven at 70°C for 18 hours. After being removed, the fibers were screened through a 100-mesh standard sieve to remove agglomerates, and conductive fiber 1 was obtained.

[0028] Preparation Example 2 Polyacrylonitrile-based carbon fibers with a diameter of 7 μm were selected and cut into short fibers with a length of 6 mm. These fibers were placed in a plasma etching apparatus with an etching power of 250 W and an etching time of 7.5 min. After etching, the fibers were removed, rinsed three times with anhydrous ethanol, and dried in a vacuum drying oven at 65 °C for 15 h. 4 g of multi-walled carbon nanotubes with a diameter of 10–20 nm and a length of 5–10 μm were weighed, added to 100 mL of deionized water, and then 0.4 g of polyethylene glycol with a molecular weight of 8000 was added as a dispersant. The mixture was first stirred at 1800 r / min for 35 min, and then further stirred with a 350 W plasma etching apparatus. The carbon nanotubes were ultrasonically dispersed for 45 minutes using an ultrasonic generator to form a stable 4wt% carbon nanotube dispersion. The pretreated carbon fibers were added to the dispersion, followed by 3% (by weight of carbon fibers) of coupling agent KH-560. After stirring evenly, the mixture was transferred to a constant temperature water bath and the temperature was set at 57.5℃. The mixture was kept at this temperature for 4 hours, with stirring every 30 minutes for 5 minutes each time. After the reaction was completed, the fibers were collected by filtration, washed with deionized water until the filtrate was clear, and dried in a vacuum drying oven at 75℃ for 20 hours. After drying, the fibers were removed and screened through a 100-mesh standard sieve to remove agglomerates, yielding conductive fiber 2.

[0029] Preparation Example 3 Polyacrylonitrile-based carbon fibers with a diameter of 8 μm were selected and cut into 7 mm long short fibers. These fibers were placed in a plasma etching apparatus with an etching power of 300 W and an etching time of 10 min. After etching, the fibers were removed, rinsed three times with anhydrous ethanol, and dried in a vacuum drying oven at 70 °C for 18 h for later use. 5 g of multi-walled carbon nanotubes with a diameter of 10–20 nm and a length of 5–10 μm were weighed, added to 100 mL of deionized water, and then 0.5 g of polyethylene glycol with a molecular weight of 8000 was added as a dispersant. The mixture was first stirred at 2000 r / min for 40 min, and then stirred with a 400 W plasma etching apparatus. The carbon nanotubes were ultrasonically dispersed for 50 minutes using an ultrasonic generator to form a stable 5wt% carbon nanotube dispersion. The pretreated carbon fibers were added to the dispersion, followed by 4% (by weight of carbon fibers) of coupling agent KH-560. After stirring evenly, the mixture was transferred to a constant temperature water bath and reacted at 60°C for 5 hours, with stirring every 30 minutes for 5 minutes each time. After the reaction was completed, the fibers were collected by filtration, washed with deionized water until the filtrate was clear, and dried in an 80°C vacuum drying oven for 24 hours. After drying, the fibers were removed and screened through a 100-mesh standard sieve to remove agglomerates, yielding conductive fiber 3.

[0030] Preparation Example 4 Polyacrylonitrile-based carbon fibers with a diameter of 7μm were selected, cut into short fibers with a length of 6mm, placed in a plasma etching device, and the etching power was set to 250W and the etching time to 7.5min. After etching, the fibers were taken out, rinsed three times with anhydrous ethanol, and dried in a vacuum drying oven at 65℃ for 15h for later use. Weigh 10g of polylactic acid-polyethylene glycol block copolymer and dissolve it in 50mL of chloroform. Stir at 30℃ and 500r / min for 2h until it is completely dissolved and forms a uniform shell solution.

[0031] The pretreated carbon fiber was used as the core layer. The shell solution was injected into the shell injector of the spinning machine. The spinning voltage was set to 15kV, the receiving distance to 15cm, the feed rate to 1.0mL / h, and the core layer traction rate to 0.5m / min. The equipment was started to spin the fiber and form an 8μm thick polylactic acid-polyethylene glycol block copolymer intermediate layer. After collecting the fiber, it was dried in a vacuum drying oven at 50℃ for 8h. Weigh 4g of multi-walled carbon nanotubes with a diameter of 10-20nm and a length of 5-10μm, add 100mL of deionized water, and then add 0.4g of polyethylene glycol with a molecular weight of 8000 as a dispersant. First, stir at 1800r / min for 35min, and then ultrasonically disperse for 45min using a 350W ultrasonic generator to form a stable 4wt% carbon nanotube dispersion. Add the fiber with the middle layer to the above dispersion, and then add 3% of the carbon fiber mass of coupling agent KH-560. After stirring evenly, transfer to a constant temperature water bath, set the temperature to 57.5℃, and react at a constant temperature for 4h. During the reaction, stir once every 30min for 5min each time. After the reaction is completed, filter and collect the fiber, wash with deionized water until the filtrate is clear, and dry in a vacuum drying oven at 75℃ for 20h. After taking it out, screen it through a 100-mesh standard sieve to remove agglomerates and obtain conductive fiber 4.

[0032] Preparation Example 5 Polyacrylonitrile-based carbon fibers with a diameter of 7μm were selected, cut into short fibers with a length of 6mm, placed in a plasma etching device, and the etching power was set to 250W and the etching time to 7.5min. After etching, the fibers were taken out, rinsed three times with anhydrous ethanol, and dried in a vacuum drying oven at 65℃ for 15h for later use. Weigh 12g of polylactic acid-polyethylene glycol block copolymer and dissolve it in 50mL of chloroform. Stir at 30℃ and 600r / min for 2.5h until completely dissolved to form a uniform shell solution. Use the pretreated carbon fiber as the core layer. Inject the shell solution into the shell injector of the spinning machine. Set the spinning voltage to 17.5kV, the receiving distance to 17.5cm, the feed rate to 1.0mL / h, and the core layer traction rate to 0.4m / min. Start the equipment to spin and form a 10μm thick polylactic acid-polyethylene glycol block copolymer intermediate layer. After collecting the fiber, dry it in a vacuum drying oven at 55℃ for 10h.

[0033] Weigh 4g of multi-walled carbon nanotubes with a diameter of 10-20nm and a length of 5-10μm, add 100mL of deionized water, and then add 0.4g of polyethylene glycol with a molecular weight of 8000 as a dispersant. First, stir at 1800r / min for 35min, and then ultrasonically disperse for 45min using a 350W ultrasonic generator to form a stable 4wt% carbon nanotube dispersion. Add the fiber with the middle layer to the above dispersion, and then add 3% of the carbon fiber mass of coupling agent KH-560. After stirring evenly, transfer to a constant temperature water bath, set the temperature to 57.5℃, and react at a constant temperature for 4h. During the reaction, stir once every 30min for 5min each time. After the reaction is completed, filter and collect the fiber, wash with deionized water until the filtrate is clear, and dry in a vacuum drying oven at 75℃ for 20h. After taking it out, screen it through a 100-mesh standard sieve to remove agglomerates and obtain conductive fiber 5.

[0034] Preparation Example 6 Polyacrylonitrile-based carbon fibers with a diameter of 7μm were selected, cut into short fibers with a length of 6mm, placed in a plasma etching device, and the etching power was set to 250W and the etching time to 7.5min. After etching, the fibers were taken out, rinsed three times with anhydrous ethanol, and dried in a vacuum drying oven at 65℃ for 15h for later use. Weigh 15g of polylactic acid-polyethylene glycol block copolymer and dissolve it in 50mL of chloroform. Stir at 30℃ and 700r / min for 3h until completely dissolved to form a uniform shell solution. Use the pretreated carbon fiber as the core layer. Inject the shell solution into the shell injector of the spinning machine. Set the spinning voltage to 20kV, the receiving distance to 20cm, the feed rate to 1.0mL / h, and the core layer traction rate to 0.3m / min. Start the equipment to spin and form a 12μm thick polylactic acid-polyethylene glycol block copolymer intermediate layer. After collecting the fiber, dry it in a vacuum drying oven at 60℃ for 12h. Weigh 4g of multi-walled carbon nanotubes with a diameter of 10-20nm and a length of 5-10μm, add 100mL of deionized water, and then add 0.4g of polyethylene glycol with a molecular weight of 8000 as a dispersant. First, stir at 1800r / min for 35min, and then ultrasonically disperse for 45min using a 350W ultrasonic generator to form a stable 4wt% carbon nanotube dispersion. Add the fiber with the middle layer to the above dispersion, and then add 3% of the carbon fiber mass of coupling agent KH-560. After stirring evenly, transfer to a constant temperature water bath, set the temperature to 57.5℃, and react at a constant temperature for 4h. During the reaction, stir once every 30min for 5min each time. After the reaction is completed, filter and collect the fiber, wash with deionized water until the filtrate is clear, and dry in a vacuum drying oven at 75℃ for 20h. After taking it out, screen it through a 100-mesh standard sieve to remove agglomerates and obtain conductive fiber 6.

[0035] Preparation Example 7 Temperature-controlled slow-release microcapsules 1 Weigh 5g of chitosan and dissolve it in 500mL of 1% acetic acid aqueous solution. Stir at 40℃ and 500r / min for 1.5h until completely dissolved to obtain a chitosan solution. Weigh 7.5g of polylactic acid and dissolve it in 150mL of dichloromethane. Stir at room temperature and 300r / min for 1h until completely dissolved to obtain a polylactic acid dichloromethane solution. Slowly add the chitosan solution dropwise to the polylactic acid dichloromethane solution (2:3 mass ratio). Add 0.625g of vanadium dioxide nanoparticles (20nm diameter, 5% of the total mass of the wall material), and ultrasonically disperse using a 300W ultrasonic generator for 20min. Collect the uniformly dispersed slurry. Weigh 6.25g of citric acid retarder and add it to 125mL of anhydrous ethanol. Stir at room temperature and 400r / min for 30min until completely dissolved. The core material mixture was collected. The core material mixture was slowly dripped into the above dispersion slurry at a core-to-wall mass ratio of 1:2. A high-shear emulsifier was used for shear emulsification at 8000 r / min for 5 min, and a stable W / O / W composite emulsion was collected. 5% (by volume) of 2wt% glutaraldehyde crosslinking agent was added to the composite emulsion, and the mixture was placed in a 40℃ constant-temperature water bath and stirred at 300 r / min for 2 h to complete the wall material crosslinking. The crosslinked emulsion was transferred to a rotary evaporator and rotary evaporated at 40℃ and -0.08 MPa for 1 h to remove dichloromethane and ethanol. Subsequently, a spray dryer was used with an inlet temperature of 120℃, an outlet temperature of 60℃, and a feed rate of 5 mL / min. After drying, the product was collected and screened through a 50-100 mesh sieve to obtain temperature-controlled slow-release microcapsules 1.

[0036] Preparation Example 8 Weigh 6g of chitosan and dissolve it in 600mL of 1% acetic acid aqueous solution. Stir at 45℃ and 600r / min for 1.75h until completely dissolved to obtain a chitosan solution. Weigh 9g of polylactic acid and dissolve it in 180mL of dichloromethane. Stir at room temperature and 350r / min for 1.25h until completely dissolved to obtain a polylactic acid dichloromethane solution. Slowly add the chitosan solution dropwise to the polylactic acid dichloromethane solution (2:3 mass ratio). Add 1.08g of barium titanate nanoparticles (6.5% of the total mass of the wall material, 25nm particle size). Disperse the mixture using a 350W ultrasonic generator for 25min. Collect the uniformly dispersed slurry. Weigh 7.5g of citric acid retarder and add it to 150mL of anhydrous ethanol. Stir at room temperature and 450r / min for 35min until completely dissolved. Collect the core. The core-to-wall mass ratio of the core-to-wall mixture was 1:2. The mixture was slowly dripped into the above dispersion slurry and emulsified at 9000 r / min for 6.5 min using a high-shear emulsifier. A stable W / O / W composite emulsion was collected. 6.5% (by volume) of 2wt% glutaraldehyde crosslinking agent was added to the composite emulsion, and the mixture was placed in a 45℃ constant-temperature water bath and stirred at 350 r / min for 2.5 h to complete the wall material crosslinking. The crosslinked emulsion was transferred to a rotary evaporator and evaporated at 45℃ and -0.085 MPa for 1.25 h to remove dichloromethane and ethanol. Subsequently, a spray dryer was used with an inlet temperature of 125℃, an outlet temperature of 65℃, and a feed rate of 6.5 mL / min. After drying, the product was collected and screened through a 50-100 mesh sieve to obtain temperature-controlled slow-release microcapsules 2.

[0037] Preparation Example 9 Weigh 7g of chitosan and dissolve it in 700mL of 1% acetic acid aqueous solution. Stir at 50℃ and 700r / min for 2h until completely dissolved to obtain a chitosan solution. Weigh 10.5g of polylactic acid and dissolve it in 210mL of dichloromethane. Stir at room temperature and 400r / min for 1.5h until completely dissolved to obtain a polylactic acid dichloromethane solution. Slowly add the chitosan solution dropwise to the polylactic acid dichloromethane solution (2:3 mass ratio). Add 1.4g of vanadium dioxide nanoparticles (30nm particle size, accounting for 8% of the total mass of the wall material). Disperse the mixture ultrasonically using a 400W ultrasonic generator for 30min and collect the uniformly dispersed slurry. Weigh 8.75g of citric acid retarder and add it to 175mL of anhydrous ethanol. Stir at room temperature and 500r / min for 40min until completely dissolved. Collect the core material mixture; with a core-to-wall mass ratio of 1:2, slowly drip the core material mixture into the above dispersion slurry, and use a high-shear emulsifier to shear emulsify at 10000 r / min for 8 min, collecting a stable W / O / W composite emulsion; add 8% by volume of 2wt% glutaraldehyde crosslinking agent to the composite emulsion, place it in a 50℃ constant temperature water bath, and stir at 400 r / min for 3 h to complete the wall material crosslinking; transfer the crosslinked emulsion to a rotary evaporator, and rotary evaporate at 50℃ and -0.09 MPa for 1.5 h to remove dichloromethane and ethanol; then use a spray dryer with an inlet temperature of 130℃, an outlet temperature of 70℃, and a feed rate of 8 mL / min, dry and collect the product, and screen it through a 50-100 mesh sieve to obtain temperature-controlled slow-release microcapsules 3.

[0038] Preparation Example 10 Self-healing conductive microspheres 1 Weigh 10g of carbon black with a particle size of 20-50nm and 5g of nano-aluminum powder with a particle size of 50-80nm, mix them at a mass ratio of 2:1, add 100mL of deionized water, and then add 0.5g of sodium dodecyl sulfate dispersant. First, stir at 1800r / min for 40min, then ultrasonically disperse using a 400W ultrasonic generator for 30min to form a uniform core material dispersion. Weigh 5g of epoxy resin E-51, dissolve it in 50mL of acetone, and stir at 30℃ and 600r / min for 1.5h until completely dissolved. Then add 0.5g of ethylenediamine curing agent and continue stirring for 30min to obtain a stable core material dispersion. A wall material solution was prepared; the mass ratio of wall material to core material was 1:3. The core material dispersion was slowly dripped into the wall material solution, and a high-shear emulsifier was used to shear and emulsify at 12000 r / min for 20 min to form a water-in-oil emulsion with uniform particle size. The emulsion was transferred to a constant temperature water bath, set at 40℃, and stirred at 300 r / min for 2 h. The microspheres were collected by filtration, washed 3 times with deionized water and 2 times with anhydrous ethanol to remove residual solvent and dispersant, and dried in a vacuum drying oven at 60℃ for 12 h. The particles that passed through the sieve were collected after screening through a 150-mesh standard sieve to obtain 1 self-healing conductive microspheres with a particle size of 100 μm.

[0039] Preparation Example 11 Self-healing conductive microspheres 2 Weigh 12.5g of carbon black with a particle size of 20-50nm and 6.25g of nano-aluminum powder with a particle size of 50-80nm, mix them at a mass ratio of 2:1, add 125mL of deionized water, and then add 0.625g of sodium dodecyl sulfate dispersant. First, stir at 1600r / min for 35min, then ultrasonically disperse using a 350W ultrasonic generator for 25min to form a uniform core material dispersion. Weigh 6.25g of epoxy resin E-51, dissolve it in 62.5mL of acetone, and stir at 30℃ and 550r / min for 1.75h until completely dissolved. Then add 0.625g of ethylenediamine curing agent and continue stirring for 30min to obtain a stable wall material solution. The core material dispersion was slowly dripped into the wall material solution at a mass ratio of 1:3. A high-shear emulsifier was used to shear and emulsify the solution at 10,000 r / min for 17.5 min to form a water-in-oil emulsion with uniform particle size. The emulsion was transferred to a constant-temperature water bath at 45℃ and stirred at 350 r / min for 2.5 h to allow the epoxy resin to fully crosslink and cure. The microspheres were collected by filtration, washed three times with deionized water and twice with anhydrous ethanol to remove residual solvent and dispersant, and dried in a vacuum drying oven at 65℃ for 15 h. The microspheres were then screened through a 120-mesh standard sieve, and particles that passed through the sieve but were retained on a 150-mesh sieve were collected to obtain 150 μm self-healing conductive microspheres.

[0040] Preparation Example 12 Weigh 15g of carbon black with a particle size of 20-50nm and 7.5g of nano-aluminum powder with a particle size of 50-80nm, mix them at a mass ratio of 2:1, add 150mL of deionized water, and then add 0.75g of sodium dodecyl sulfate dispersant. First, stir at 1400r / min for 30min, then ultrasonically disperse using a 300W ultrasonic generator for 20min to form a uniform core material dispersion. Weigh 7.5g of epoxy resin E-51, dissolve it in 75mL of acetone, and stir at 30℃ and 500r / min for 2h until completely dissolved. Then add 0.75g of ethylenediamine curing agent and continue stirring for 30min to obtain a stable wall material solution. The core material dispersion was slowly dripped into the wall material solution at a mass ratio of 1:3 to the core material. A high-shear emulsifier was used to shear and emulsify the solution at 8000 rpm for 15 minutes to form a water-in-oil emulsion with uniform particle size. The emulsion was transferred to a constant-temperature water bath at 50°C and stirred at 400 rpm for 3 hours to allow the epoxy resin to fully crosslink and cure. The microspheres were collected by filtration, washed three times with deionized water and twice with anhydrous ethanol to remove residual solvent and dispersant, and dried in a vacuum drying oven at 70°C for 18 hours. The microspheres were then screened through an 80-mesh standard sieve, and particles that passed through the sieve but were retained on a 100-mesh sieve were collected to obtain self-healing conductive microspheres with a particle size of approximately 200 μm.

[0041] Preparation Example 13 Mineral admixtures were prepared by mixing silica fume, metakaolin, and fly ash in a mass ratio of 1:2:3. Example

[0042] A conductive fiber-reinforced self-sensing seamless concrete flooring material, comprising the following substances: 300kg cement, 1600kg aggregate, 80kg mineral admixture, 0.8kg conductive fiber, 1.2kg polyether dispersant, and 100kg water; A method for preparing a conductive fiber-reinforced self-sensing seamless concrete flooring material includes the following steps: Cement, aggregates, and mineral admixtures are added to a twin-shaft mixer and dry-mixed for 2 minutes; water and polyether dispersant are added and mixed at 1000 rpm for 3 minutes; conductive fibers are added and mixed at 600 rpm for 2 minutes to obtain a uniform concrete mixture. The ultrasonic generator was set to a frequency of 45kHz and a power of 300W. A weak magnetic field of 0.15T was applied by the electromagnetic directional device at a distance of 0.8m. 3 The concrete is poured in units at a speed of / min, with an overlap interval of ≤1.5h between adjacent units, and is carried out in conjunction with high-frequency vibrators, vacuum dewatering machines and laser leveling machines. Immediately after pouring, cover with a smart temperature-controlled curing film and cure for 14 days according to the following parameters: 0~6h curing temperature 22℃, humidity 95%; 6~24h curing temperature rises to 28℃, humidity 95%; after 24h, return to room temperature curing, maintaining humidity 85%. At 24h, 48h, and 72h after pouring, a universal testing machine and a resistance tester were used to calibrate the stress / resistance signal of the floor, record the initial reference value, and complete the material preparation. Example

[0043] A conductive fiber-reinforced self-sensing seamless concrete flooring material, comprising the following substances: 325kg cement, 1700kg aggregate, 100kg mineral admixture, 1.0kg conductive fiber, 2kg polyether dispersant, and 105kg water; A method for preparing a conductive fiber-reinforced self-sensing seamless concrete flooring material includes the following steps: Cement, aggregates, and mineral admixtures are added to a twin-shaft mixer and dry-mixed for 2 minutes; water and polyether dispersant are added and mixed at 1000 rpm for 3 minutes; conductive fibers are added and mixed at 450 rpm for 2 minutes to obtain a uniform concrete mixture. The ultrasonic generator was set to a frequency of 35kHz and a power of 250W. A weak magnetic field of 0.125T was applied by the electromagnetic directional device at a distance of 0.65m. 3The concrete is poured in units at a speed of / min, with an overlap interval of ≤1.5h between adjacent units, and is carried out in conjunction with high-frequency vibrators, vacuum dewatering machines and laser leveling machines. Immediately after pouring, cover with a smart temperature-controlled curing film and cure for 14 days according to the following parameters: 0~6h curing temperature 21℃, humidity 95%; 6~24h curing temperature rises to 26.5℃, humidity 92%; after 24h, return to room temperature curing, maintaining humidity 85%. At 24h, 48h, and 72h after pouring, a universal testing machine and a resistance tester were used to calibrate the stress / resistance signal of the floor, record the initial reference value, and complete the material preparation. Example

[0044] A conductive fiber-reinforced self-sensing seamless concrete flooring material, comprising the following substances: 350kg cement, 1800kg aggregate, 120kg mineral admixture, 1.2kg conductive fiber, 3kg polyether dispersant, and 110kg water; A method for preparing a conductive fiber-reinforced self-sensing seamless concrete flooring material includes the following steps: Cement, aggregates, and mineral admixtures are added to a twin-shaft mixer and dry-mixed for 2 minutes; water and polyether dispersant are added and mixed at 1000 rpm for 3 minutes; conductive fibers are added and mixed at 300 rpm for 2 minutes to obtain a uniform concrete mixture. The ultrasonic generator was set to a frequency of 25kHz and a power of 200W. A weak magnetic field of 0.1T was applied by the electromagnetic directional device, with a range of 0.5m. 3 The concrete is poured in units at a speed of / min, with an overlap interval of ≤1.5h between adjacent units, and is carried out in conjunction with high-frequency vibrators, vacuum dewatering machines and laser leveling machines. Immediately after pouring, cover with a smart temperature-controlled curing film and cure for 14 days according to the following parameters: 0~6h curing temperature 20℃, humidity 90%; 6~24h curing temperature rise to 25℃, humidity 95%; after 24h, return to room temperature curing, maintaining 80% humidity. At 24h, 48h, and 72h after pouring, a universal testing machine and a resistance tester were used to calibrate the stress / resistance signal of the floor, record the initial reference value, and complete the material preparation. Example

[0045] A conductive fiber-reinforced self-sensing seamless concrete flooring material, comprising the following substances: 325kg cement, 1700kg aggregate, 100kg mineral admixture, 1.0kg conductive fiber, 4.2kg polyether dispersant, and 105kg water; A method for preparing a conductive fiber-reinforced self-sensing seamless concrete flooring material includes the following steps: Cement, aggregates, and mineral admixtures are added to a twin-shaft mixer and dry-mixed for 2 minutes; water and polyether dispersant are added and mixed at 1000 rpm for 3 minutes; conductive fibers are added and mixed at 450 rpm for 2 minutes to obtain a uniform concrete mixture. The ultrasonic generator was set to a frequency of 35kHz and a power of 250W. A weak magnetic field of 0.125T was applied by the electromagnetic directional device at a distance of 0.65m. 3 The concrete is poured in units at a speed of / min, with an overlap interval of ≤1.5h between adjacent units, and is carried out in conjunction with high-frequency vibrators, vacuum dewatering machines and laser leveling machines. Immediately after pouring, cover with a smart temperature-controlled curing film and cure for 14 days according to the following parameters: 0~6h curing temperature 21℃, humidity 95%; 6~24h curing temperature rises to 26.5℃, humidity 92%; after 24h, return to room temperature curing, maintaining humidity 85%. At 24h, 48h, and 72h after pouring, a universal testing machine and a resistance tester were used to calibrate the stress / resistance signal of the floor, record the initial reference value, and complete the material preparation. Example

[0046] A conductive fiber-reinforced self-sensing seamless concrete flooring material, comprising the following substances: 325kg cement, 1700kg aggregate, 100kg mineral admixture, 1.0kg conductive fiber, 5.2kg polyether dispersant, and 105kg water; A method for preparing a conductive fiber-reinforced self-sensing seamless concrete flooring material includes the following steps: Cement, aggregates, and mineral admixtures are added to a twin-shaft mixer and dry-mixed for 2 minutes; water and polyether dispersant are added and mixed at 1000 rpm for 3 minutes; conductive fibers are added and mixed at 450 rpm for 2 minutes to obtain a uniform concrete mixture. The ultrasonic generator was set to a frequency of 35kHz and a power of 250W. A weak magnetic field of 0.125T was applied by the electromagnetic directional device at a distance of 0.65m. 3 The concrete is poured in units at a speed of / min, with an overlap interval of ≤1.5h between adjacent units, and is carried out in conjunction with high-frequency vibrators, vacuum dewatering machines and laser leveling machines. Immediately after pouring, cover with a smart temperature-controlled curing film and cure for 14 days according to the following parameters: 0~6h curing temperature 21℃, humidity 95%; 6~24h curing temperature rises to 26.5℃, humidity 92%; after 24h, return to room temperature curing, maintaining humidity 85%. At 24h, 48h, and 72h after pouring, a universal testing machine and a resistance tester were used to calibrate the stress / resistance signal of the floor, record the initial reference value, and complete the material preparation. Example

[0047] A conductive fiber-reinforced self-sensing seamless concrete flooring material, comprising the following substances: 325kg cement, 1700kg aggregate, 100kg mineral admixture, 1.0kg conductive fiber, 6.2kg polyether dispersant, and 105kg water; A method for preparing a conductive fiber-reinforced self-sensing seamless concrete flooring material includes the following steps: Cement, aggregates, and mineral admixtures are added to a twin-shaft mixer and dry-mixed for 2 minutes; water and polyether dispersant are added and mixed at 1000 rpm for 3 minutes; conductive fibers are added and mixed at 450 rpm for 2 minutes to obtain a uniform concrete mixture. The ultrasonic generator was set to a frequency of 35kHz and a power of 250W. A weak magnetic field of 0.125T was applied by the electromagnetic directional device at a distance of 0.65m. 3 The concrete is poured in units at a speed of / min, with an overlap interval of ≤1.5h between adjacent units, and is carried out in conjunction with high-frequency vibrators, vacuum dewatering machines and laser leveling machines. Immediately after pouring, cover with a smart temperature-controlled curing film and cure for 14 days according to the following parameters: 0~6h curing temperature 21℃, humidity 95%; 6~24h curing temperature rises to 26.5℃, humidity 92%; after 24h, return to room temperature curing, maintaining humidity 85%. At 24h, 48h, and 72h after pouring, a universal testing machine and a resistance tester were used to calibrate the stress / resistance signal of the floor, record the initial reference value, and complete the material preparation. Example

[0048] A conductive fiber-reinforced self-sensing seamless concrete flooring material, comprising the following substances: 325kg cement, 1700kg aggregate, 100kg mineral admixture, 1.0kg conductive fiber, 2.5kg temperature-controlled retarding microcapsules, 1.2kg polyether dispersant, and 105kg water; A method for preparing a conductive fiber-reinforced self-sensing seamless concrete flooring material includes the following steps: Cement, aggregates, and mineral admixtures were added to a twin-shaft mixer and dry-mixed for 2 minutes; water and polyether dispersant were added and mixed at 1000 rpm for 3 minutes; then temperature-controlled retarding microcapsules 1 were added and mixed at 700 rpm for 2 minutes; conductive fibers were added and mixed at 450 rpm for 2 minutes to obtain a uniform concrete mixture. The ultrasonic generator was set to a frequency of 35kHz and a power of 250W. A weak magnetic field of 0.125T was applied by the electromagnetic directional device at a distance of 0.65m. 3 The concrete is poured in units at a speed of / min, with an overlap interval of ≤1.5h between adjacent units, and is carried out in conjunction with high-frequency vibrators, vacuum dewatering machines and laser leveling machines. Immediately after pouring, cover with a smart temperature-controlled curing film and cure for 14 days according to the following parameters: 0~6h curing temperature 21℃, humidity 95%; 6~24h curing temperature rises to 26.5℃, humidity 92%; after 24h, return to room temperature curing, maintaining humidity 85%. At 24h, 48h, and 72h after pouring, a universal testing machine and a resistance tester were used to calibrate the stress / resistance signal of the floor, record the initial reference value, and complete the material preparation. Example

[0049] A conductive fiber-reinforced self-sensing seamless concrete flooring material, comprising the following substances: 325kg cement, 1700kg aggregate, 100kg mineral admixture, 1.0kg conductive fiber, 2.6kg temperature-controlled retarding microcapsules, 2kg polyether dispersant, and 105kg water; A method for preparing a conductive fiber-reinforced self-sensing seamless concrete flooring material includes the following steps: Cement, aggregates, and mineral admixtures were added to a twin-shaft mixer and dry-mixed for 2 minutes; water and polyether dispersant were added and mixed at 1000 rpm for 3 minutes; then temperature-controlled retarding microcapsules 1 were added and mixed at 700 rpm for 2 minutes; conductive fibers were added and mixed at 450 rpm for 2 minutes to obtain a uniform concrete mixture. The ultrasonic generator was set to a frequency of 35kHz and a power of 250W. A weak magnetic field of 0.125T was applied by the electromagnetic directional device. The concrete was poured in units at a speed of 0.65m3 / min, with an overlap interval of ≤1.5h between adjacent units. The concrete was then poured in conjunction with a high-frequency vibrator, a vacuum dehydrator and a laser leveling machine. Immediately after pouring, cover with a smart temperature-controlled curing film and cure for 14 days according to the following parameters: 0~6h curing temperature 21℃, humidity 95%; 6~24h curing temperature rises to 26.5℃, humidity 92%; after 24h, return to room temperature curing, maintaining humidity 85%. At 24h, 48h, and 72h after pouring, a universal testing machine and a resistance tester were used to calibrate the stress / resistance signal of the floor, record the initial reference value, and complete the material preparation. Example

[0050] A conductive fiber-reinforced self-sensing seamless concrete flooring material, comprising the following substances: 325kg cement, 1700kg aggregate, 100kg mineral admixture, 1.0kg conductive fiber, 2.8kg temperature-controlled retarding microcapsules, 3.2kg polyether dispersant, and 105kg water; A method for preparing a conductive fiber-reinforced self-sensing seamless concrete flooring material includes the following steps: Cement, aggregates, and mineral admixtures were added to a twin-shaft mixer and dry-mixed for 2 minutes; water and polyether dispersant were added and mixed at 1000 rpm for 3 minutes; then temperature-controlled retarding microcapsules 1 were added and mixed at 700 rpm for 2 minutes; conductive fibers were added and mixed at 450 rpm for 2 minutes to obtain a uniform concrete mixture. The ultrasonic generator was set to a frequency of 35kHz and a power of 250W. A weak magnetic field of 0.125T was applied by the electromagnetic directional device at a distance of 0.65m. 3 The concrete is poured in units at a speed of / min, with an overlap interval of ≤1.5h between adjacent units, and is carried out in conjunction with high-frequency vibrators, vacuum dewatering machines and laser leveling machines. Immediately after pouring, cover with a smart temperature-controlled curing film and cure for 14 days according to the following parameters: 0~6h curing temperature 21℃, humidity 95%; 6~24h curing temperature rises to 26.5℃, humidity 92%; after 24h, return to room temperature curing, maintaining humidity 85%. At 24h, 48h, and 72h after pouring, a universal testing machine and a resistance tester were used to calibrate the stress / resistance signal of the floor, record the initial reference value, and complete the material preparation. Example

[0051] A conductive fiber-reinforced self-sensing seamless concrete flooring material, comprising the following substances: 325kg cement, 1700kg aggregate, 100kg mineral admixture, 1.0kg conductive fiber, 2.6kg temperature-controlled retarding microcapsules, 15kg self-healing conductive microspheres, 2kg polyether dispersant, and 105kg water; A method for preparing a conductive fiber-reinforced self-sensing seamless concrete flooring material includes the following steps: Cement, aggregates, and mineral admixtures were added to a twin-shaft mixer and dry-mixed for 2 minutes; water and polyether dispersant were added and mixed at 1000 rpm for 3 minutes; then temperature-controlled retarding microcapsules 1 were added and mixed at 700 rpm for 2 minutes; conductive fibers were added and mixed at 450 rpm for 2 minutes to obtain a uniform concrete mixture. The ultrasonic generator was set to a frequency of 35kHz and a power of 250W. A weak magnetic field of 0.125T was applied by the electromagnetic directional device at a distance of 0.65m. 3The concrete is poured in units at a speed of / min, with an overlap interval of ≤1.5h between adjacent units, and is carried out in conjunction with high-frequency vibrators, vacuum dewatering machines and laser leveling machines. Immediately after pouring, cover with a smart temperature-controlled curing film and cure for 14 days according to the following parameters: 0~6h curing temperature 21℃, humidity 95%; 6~24h curing temperature rises to 26.5℃, humidity 92%; after 24h, return to room temperature curing, maintaining humidity 85%. At 24h, 48h, and 72h after pouring, a universal testing machine and a resistance tester were used to calibrate the stress / resistance signal of the floor, record the initial reference value, and complete the material preparation. Example

[0052] A conductive fiber-reinforced self-sensing seamless concrete flooring material, comprising the following substances: 325kg cement, 1700kg aggregate, 100kg mineral admixture, 1.0kg conductive fiber, 2.6kg temperature-controlled retarding microcapsules, 2.17kg self-healing conductive microspheres, 2kg polyether dispersant, and 105kg water; A method for preparing a conductive fiber-reinforced self-sensing seamless concrete flooring material includes the following steps: Cement, aggregates, and mineral admixtures were added to a twin-shaft mixer and dry-mixed for 2 minutes; water and polyether dispersant were added and mixed at 1000 rpm for 3 minutes; then temperature-controlled retarding microcapsules 1 were added and mixed at 700 rpm for 2 minutes; conductive fibers were added and mixed at 450 rpm for 2 minutes to obtain a uniform concrete mixture. The ultrasonic generator was set to a frequency of 35kHz and a power of 250W. A weak magnetic field of 0.125T was applied by the electromagnetic directional device. The concrete was poured in units at a speed of 0.65m3 / min, with an overlap interval of ≤1.5h between adjacent units. The concrete was then poured in conjunction with a high-frequency vibrator, a vacuum dehydrator and a laser leveling machine. Immediately after pouring, cover with a smart temperature-controlled curing film and cure for 14 days according to the following parameters: 0~6h curing temperature 21℃, humidity 95%; 6~24h curing temperature rises to 26.5℃, humidity 92%; after 24h, return to room temperature curing, maintaining humidity 85%. At 24h, 48h, and 72h after pouring, a universal testing machine and a resistance tester were used to calibrate the stress / resistance signal of the floor, record the initial reference value, and complete the material preparation. Example

[0053] A conductive fiber-reinforced self-sensing seamless concrete flooring material, comprising the following substances: 325kg cement, 1700kg aggregate, 100kg mineral admixture, 1.0kg conductive fiber, 2.6kg temperature-controlled retarding microcapsules, 20kg self-healing conductive microspheres, 3.2kg polyether dispersant and 105kg water; A method for preparing a conductive fiber-reinforced self-sensing seamless concrete flooring material includes the following steps: Cement, aggregates, and mineral admixtures were added to a twin-shaft mixer and dry-mixed for 2 minutes; water and polyether dispersant were added and mixed at 1000 rpm for 3 minutes; then temperature-controlled retarding microcapsules 1 were added and mixed at 700 rpm for 2 minutes; conductive fibers were added and mixed at 450 rpm for 2 minutes to obtain a uniform concrete mixture. The ultrasonic generator was set to a frequency of 35kHz and a power of 250W. A weak magnetic field of 0.125T was applied by the electromagnetic directional device at a distance of 0.65m. 3 The concrete is poured in units at a speed of / min, with an overlap interval of ≤1.5h between adjacent units, and is carried out in conjunction with high-frequency vibrators, vacuum dewatering machines and laser leveling machines. Immediately after pouring, cover with a smart temperature-controlled curing film and cure for 14 days according to the following parameters: 0~6h curing temperature 21℃, humidity 95%; 6~24h curing temperature rises to 26.5℃, humidity 92%; after 24h, return to room temperature curing, maintaining humidity 85%. At 24h, 48h, and 72h after pouring, a universal testing machine and a resistance tester were used to calibrate the stress / resistance signal of the floor, record the initial reference value, and complete the material preparation.

[0054] Comparative Example 1 Compared with Example 1, Comparative Example 1 added an equal mass of carbon fiber to replace the conductive fiber, and the remaining preparation steps and methods were the same as in Example 1.

[0055] 28-day compressive strength: tested according to standard GB / T 50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete"; Volume resistivity: Tested according to standard GB / T 1410-2006 "Test methods for volume resistivity and surface resistivity of solid insulating materials"; Sensing sensitivity (GF value): A stress of 0~5MPa is applied using a universal testing machine, and the resistance change rate is recorded simultaneously. GF = resistance change rate / strain; 72h Sensing Accuracy Attenuation Rate: The sensing sensitivity was tested 24h and 72h after pouring, and the attenuation rate was calculated as: (24h GF - 72h GF) / 24h GF × 100%; 180d sensor performance retention rate: The sensor sensitivity was tested after 180 days of curing, and the retention rate was calculated as: 180d GF / 28d GF×100%.

[0056] The results are shown in Table 1 below:

[0057] By comparing the test results of Examples 1-12 and Comparative Example 1 with those in Table 1, it can be found that: Examples 1-3, employing binary conductive fibers, demonstrate superior performance compared to ordinary carbon fiber in Comparative Example 1. This illustrates that the technical solution of this application utilizes a polyacrylonitrile-based carbon fiber core layer to provide mechanical reinforcement, and employs a carbon nanotube fluff coating layer to construct a continuous conductive pathway. Combined with the scientific formulation of basic components such as cement and aggregates, this achieves a preliminary synergy between mechanical and conductive properties. This solution addresses the problem of traditional concrete lacking an effective conductive reinforcement structure, enabling the material to possess self-sensing capabilities while meeting the basic engineering requirements of seamless flooring. It provides a stable foundation for the subsequent addition of functional components and structural optimization, laying the core architecture of the overall technical solution.

[0058] By comparing Examples 4-6 with Examples 1-3, this application further illustrates the optimized conductive fiber structure by introducing a polylactic acid-polyethylene glycol block copolymer interlayer, forming a three-level structure of core layer, interlayer, and coating layer. The interlayer improves the interfacial bonding between the carbon fiber core and the carbon nanotube coating layer. This design solves the problems of weak interfacial bonding and limited functionality in binary conductive fibers, ensuring the mechanical strength, conductivity, and interfacial compatibility of the conductive fibers.

[0059] By comparing Examples 7-9 with Examples 4-6, it is further shown that the addition of temperature-controlled retarding microcapsules in Examples 7-9 significantly increases the area of ​​a single seamless pour and reduces the attenuation rate of sensing accuracy after 72 hours, proving that the temperature-controlled retarding microcapsules effectively solve the conflict between retarding and sensing.

[0060] Finally, by comparing Examples 10-12 with Examples 7-9, it is further demonstrated that Examples 10-12, which simultaneously added temperature-controlled slow-release microcapsules and self-healing conductive microspheres, achieved optimal performance in all aspects, demonstrating the synergistic effect of tertiary conductive fibers, temperature-controlled slow-release microcapsules, and self-healing conductive microspheres.

[0061] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

[0062] All publications, patent applications, patents, and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings commonly understood by those skilled in the art. In case of conflict, the definitions in this specification shall prevail.

[0063] When this specification uses the prefixes “known to those skilled in the art,” “prior art,” or similar terms to derive materials, substances, methods, steps, apparatus, or components, the objects derived from such prefixes cover those commonly used in the art at the time of this application, but also include those that are not currently commonly used but will become generally recognized in the art as suitable for similar purposes.

[0064] In the context of this specification, except where expressly stated otherwise, any matters or issues not mentioned shall apply directly to those known in the art without any modification.

Claims

1. A conductive fiber-reinforced self-sensing seamless concrete flooring material, characterized in that, include 300-350 parts cement; 1600-1800 parts of aggregate; 80-120 parts of mineral admixtures; 0.8~1.2 parts of conductive fiber; 2-3 parts of polyether dispersant; 100-110 parts water; The conductive fiber comprises a polyacrylonitrile-based carbon fiber core layer with a diameter of 6-8 μm and a coating layer covered with carbon nanotube fibers.

2. The conductive fiber-reinforced self-sensing seamless concrete flooring material according to claim 1, characterized in that, The conductive fiber also includes a polylactic acid-polyethylene glycol block copolymer intermediate layer.

3. The conductive fiber-reinforced self-sensing seamless concrete flooring material according to claim 2, characterized in that, The conductive fiber is manufactured using the following technical solution: Polyacrylonitrile-based carbon fibers are placed in a plasma etching device for etching treatment; coaxial electrospinning technology is used, with the core layer being pretreated carbon fibers and the shell layer being polylactic acid-polyethylene glycol block copolymer. The spinning voltage is 15-20kV, the receiving distance is 15-20cm, and the feed rate is 1.0mL / h, forming an intermediate layer with a thickness of 8-12μm. The conductive fiber is prepared by immersing the fiber coated with the intermediate layer in a carbon nanotube dispersion, adding a coupling agent, reacting at a constant temperature of 55-60℃ for 3-5 hours, and then washing and drying.

4. The conductive fiber-reinforced self-sensing seamless concrete flooring material according to claim 2, characterized in that, The conductive fiber reinforced self-sensing seamless floor concrete material also includes 5-8 parts by weight of temperature-controlled retarding microcapsules. The wall material of the temperature-controlled retarding microcapsules is polylactic acid-chitosan copolymer, the core material is citric acid retarder, and 5-8% nano temperature-controlled particles are doped in the wall material. The critical response temperature is 25-30℃.

5. The conductive fiber-reinforced self-sensing seamless concrete flooring material according to claim 4, characterized in that, The temperature-controlled slow-release microcapsules are manufactured using the following technical solution: Chitosan solution and polylactic acid dichloromethane solution were stirred and mixed, and nano-temperature-controlled particles were added. The mixture was then ultrasonically dispersed and the dispersion slurry was collected. After mixing citric acid retarder and anhydrous ethanol, the mixture was collected and added to the dispersion slurry. The mixture was sheared and emulsified for 5-8 minutes to obtain a composite emulsion. Add glutaraldehyde crosslinking agent to the composite emulsion, heat in a water bath at 40-50℃, remove the solvent by rotary evaporation, and then spray dry to prepare the temperature-controlled slow-release microcapsules.

6. The conductive fiber-reinforced self-sensing seamless concrete flooring material according to claim 4, characterized in that, The nano-temperature control particles include either vanadium dioxide nanoparticles or barium titanate nanoparticles with a particle size of 20-30 nm.

7. The conductive fiber-reinforced self-sensing seamless concrete flooring material according to claim 4, characterized in that, The conductive fiber reinforced self-sensing seamless floor concrete material also includes 15-20 parts by weight of self-healing conductive microspheres. The self-healing conductive microspheres are epoxy resin wall material and carbon black / nano aluminum powder core material, with a wall material to core material mass ratio of 1:3 and a carbon black to nano aluminum powder mass ratio of 2:

1. The microspheres have a particle size of 100-200μm.

8. A method for preparing a conductive fiber-reinforced self-sensing seamless floor concrete material according to any one of claims 1-7, characterized in that, The preparation steps include the following: First, put cement, aggregate, and mineral admixture into a mixer and dry mix for 2 minutes. Then, add water and polyether dispersant, stir, and then add temperature-controlled retarding microcapsules and self-healing conductive microspheres. Stir at 600-800 r / min for 1-3 minutes. Finally, add conductive fibers and stir at a low speed of 300-600 r / min for 1-2 minutes. The mixed concrete is placed in an ultrasonic generator at a frequency of 25-45kHz and a power of 200-300W, with a weak magnetic field of 0.1-0.15T applied by an electromagnetic directional device. The pouring speed is controlled at 0.5-0.8m / s. 3 / min; After pouring, the concrete is cured under temperature control for 14 days. The stress-resistance signal of the floor is calibrated at 24h, 48h and 72h after pouring to establish the initial reference value. The conductive fiber reinforced self-sensing seamless floor concrete material can then be prepared.

9. The method for preparing a conductive fiber-reinforced self-sensing seamless floor concrete material according to claim 8, characterized in that, The 14-day temperature-controlled curing period is as follows: within 0-6 hours of curing, adjust the curing temperature to 20-22℃ and the humidity to ≥90%; within 6-24 hours of curing, adjust the curing temperature to 25-28℃ and the humidity to ≥90%; after 24 hours of curing, return to room temperature curing and maintain the humidity to ≥80%.

Images