Intelligent response type lightweight aggregate concrete and preparation method thereof

Abstract

This invention relates to a smart responsive lightweight aggregate concrete and its preparation method, wherein the concrete components are specified in kg / m³. 3 The mass ratio is as follows: cement 90-120; lightweight porous aggregate 150-200; fine aggregate 30-60; magnetically treated water 25-35; water-reducing agent 0.5-1.5; magnetic nanoparticles 0.5-2.0; cellulose ether 0.1-0.3; silica fume 5-10; nanocellulose fiber 1-3. The preparation method is as follows: 1. Add cement, silica fume, fine aggregate, cellulose ether, water-reducing agent, and nanocellulose fiber to a mixer and dry mix for 3 minutes; 2. Add magnetically treated water and mix for 4 minutes; 3. Add a dispersion of magnetic nanoparticles containing iron(III) oxide and mix for 6 minutes; 4. Add pretreated lightweight porous aggregate and slowly mix for 2 minutes. This intelligent responsive lightweight aggregate concrete solves the problems of insufficient mechanical properties and lack of intelligent responsiveness in lightweight aggregate concrete.

Description

Technical Field

[0001] This invention belongs to the field of concrete technology, and specifically relates to an intelligent responsive lightweight aggregate concrete and its preparation method. Background Technology

[0002] While traditional lightweight aggregate concrete boasts advantages such as light weight and good thermal insulation, it suffers from significant shortcomings in self-healing and intelligent response capabilities. Current technologies primarily rely on the addition of microcapsules or bacteria as repair agents for its self-healing function, which suffers from limited repair effectiveness and poor durability. Furthermore, traditional lightweight aggregate concrete lacks the ability to intelligently respond to external stimuli, making it difficult to adapt to complex environmental changes.

[0003] Currently, self-healing concrete technologies mainly include the following:

[0004] One approach is microencapsulation technology: microcapsules are embedded in concrete, and when cracks appear, the capsules rupture to release a repair agent. However, this method suffers from problems such as poor capsule stability, large amounts of repair agent required, and high costs.

[0005] Second is bacterial self-repair technology: using bacterial metabolites to repair cracks, but the bacterial survival rate is low, the repair cycle is long, and the environmental adaptability is poor.

[0006] Thirdly, shape memory alloys / polymers: self-healing is achieved through material phase change, but the cost is high and the process is complex.

[0007] Fourth, self-healing of nanomaterials: self-healing is achieved by utilizing the special properties of nanomaterials, but nanomaterials have poor dispersibility and insufficient compatibility with the matrix.

[0008] In addition, the mechanical and functional properties of existing lightweight aggregate concrete are not flexible enough to meet the needs of different engineering environments.

[0009] Therefore, how to provide a smart responsive lightweight aggregate concrete and its preparation method is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0010] This invention provides a smart responsive lightweight aggregate concrete and its preparation method, aiming to solve the technical problem that existing lightweight aggregate concrete lacks self-healing and smart responsive functions.

[0011] To solve the above technical problems, the present invention includes the following technical solutions:

[0012] A smart responsive lightweight aggregate concrete, wherein the concrete components are specified in kg / m³. 3The mass ratio is as follows: cement 90~120; lightweight porous aggregate 150~200; fine aggregate 30~60; magnetically treated water 25~35; water-reducing agent 0.5~1.5; magnetic nanoparticles 0.5~2.0; cellulose ether 0.1~0.3; silica fume 5~10; nanocellulose fiber 1~3.

[0013] Furthermore, the magnetic field-treated water is a water molecule structure with a memory effect formed by treating mixed water with multi-level electromagnetic fields.

[0014] Furthermore, the lightweight porous aggregate is selected from one or more of shale ceramsite, clay ceramsite, or fly ash ceramsite, and pre-embedded with phase change materials and repair materials, while undergoing surface functionalization treatment.

[0015] Furthermore, the magnetic nanoparticles include iron(III) oxide with a particle size of 20-50 nm.

[0016] The present invention also provides a method for preparing the aforementioned intelligent responsive lightweight aggregate concrete, comprising the following steps:

[0017] Step S1: Add cement, silica fume, fine aggregate, cellulose ether, water-reducing agent, and nanocellulose fibers to a mixer and dry mix for 3 minutes to fully disperse the nanomaterials.

[0018] Step S2: Add the magnetic field-treated water and stir for 4 minutes;

[0019] Step S3: Add the magnetic nanoparticle dispersion containing iron oxide and stir for 6 minutes;

[0020] Step S4: Add pretreated lightweight porous aggregate and stir slowly for 2 minutes to obtain intelligent responsive lightweight aggregate concrete.

[0021] Furthermore, the preparation of the magnetic field-treated water includes: taking 1000 mL of ordinary mixed water and placing it in a multi-stage magnetic field treatment device for three-stage treatment, wherein: the first stage pretreatment: setting an alternating electromagnetic field strength of 0.3T and a frequency of 50Hz for 10 minutes to destroy the original water molecule cluster structure; the second stage main treatment: setting a pulsed electromagnetic field strength of 0.5~2.0T and a frequency of 100Hz for 20 minutes to redirect water molecules to form an ordered structure; the third stage posttreatment: setting a static magnetic field strength of 0.2T for 5 minutes to stabilize the memory effect; during the treatment, the water temperature is maintained at 20±2℃, and ultrasonic assistance is applied simultaneously at a frequency of 20kHz and a power of 100W; after the treatment is completed, it is left to stand for 30 minutes to form a water molecule structure with memory effect and enhanced solubility.

[0022] Furthermore, the magnetic field-treated water employs a multi-stage magnetic field treatment technology, including the combined use of alternating electromagnetic fields and pulsed electromagnetic fields. The alternating electromagnetic field has a frequency of 50Hz, and the pulsed electromagnetic field has a frequency of 100Hz. Through two-stage magnetic field treatment, a stable water molecule memory structure is formed.

[0023] Furthermore, the method for preparing the magnetic nanoparticle dispersion includes: weighing ferric oxide magnetic nanoparticles and adding them to water treated with a magnetic field; dispersing them for 40 minutes at 12,000 rpm using a high-speed disperser, while simultaneously performing ultrasonic dispersion at a frequency of 40 kHz and a power of 200 W; adding a composite dispersant and continuing dispersion for 20 minutes; and obtaining a magnetic nanoparticle dispersion with a concentration of 1-5%.

[0024] Furthermore, the surface functionalization treatment of the pretreated lightweight porous aggregate includes: drying the ceramsite at 105°C to constant weight; treating the surface of the ceramsite with low-temperature plasma at a power of 200W for 5 minutes to enhance surface activity; immersing the treated ceramsite in a 2% silane coupling agent solution for 30 minutes to form modified ceramsite with an active surface; immersing the modified ceramsite in a precursor solution containing nano-silica to grow nanoporous structures in situ on the surface of the ceramsite using a sol-gel method; vacuum impregnating the treated ceramsite to fill the pores with liquid phase change material and repair material, followed by pore encapsulation after cooling and solidification; and then immersing it in magnetically treated water for 40 minutes to fully activate the nanostructure and drain the water.

[0025] Furthermore, it also includes step S5, molding and intelligent curing: pouring freshly mixed intelligent responsive lightweight aggregate concrete into the mold and compacting it; curing in the intelligent curing chamber under the following conditions: temperature 20±2℃, humidity ≥95%, and applying a weak magnetic field of 0.5T for 24 hours; after demolding, curing in the standard curing room until the specified age, during which external magnetic field stimulation is applied to activate the self-healing function.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] (1) The intelligent responsive lightweight aggregate concrete provided by the present invention adopts multi-level magnetic field water treatment technology. Through the synergistic effect of alternating electromagnetic field, pulse electromagnetic field and static magnetic field, a water molecule structure with memory effect and enhanced solubility is formed, which can significantly improve the cement hydration environment and improve the density and mechanical properties of concrete.

[0028] (2) The intelligent responsive lightweight aggregate concrete provided by the present invention achieves precise control of the intelligent response function of concrete through the synergistic effect of magnetic nanoparticles and multi-level magnetic field water treatment, effectively solving the technical bottleneck of traditional concrete lacking self-repair ability, improving the durability and service life of concrete, and significantly reducing the later maintenance cost, with significant economic and social benefits.

[0029] (3) The intelligent responsive lightweight aggregate concrete provided by the present invention uses magnetic nanoparticles as functional carriers and achieves dynamic control of concrete performance through magnetic field regulation. Compared with traditional static materials, it has the advantages of fast response speed, strong reversibility and high regulation accuracy.

[0030] (4) The intelligent responsive lightweight aggregate concrete provided by the present invention significantly improves the interfacial bonding performance between lightweight aggregate and cement paste through the synergistic effect of multi-level magnetic field treatment, magnetic nanoparticle dispersion and lightweight aggregate surface functionalization, and improves the overall mechanical properties, intelligent response function and temperature regulation capability of concrete, providing a new technical path for the intelligent application of lightweight aggregate concrete.

[0031] (5) The intelligent responsive lightweight aggregate concrete provided by the present invention has successfully solved the technical problems of insufficient mechanical properties and lack of intelligent response function of traditional lightweight aggregate concrete, significantly improved the mechanical properties and intelligent response characteristics of lightweight aggregate concrete, and helped to promote the application of lightweight aggregate concrete in cutting-edge fields such as intelligent buildings and self-healing structures. Attached Figure Description

[0032] Figure 1 This is a magnetic field arrangement diagram of intelligent responsive lightweight aggregate concrete during curing in an intelligent curing box according to an embodiment of the present invention;

[0033] Figure 2 This is a magnetic field layout diagram of intelligent responsive lightweight aggregate concrete during curing in a standard curing room according to an embodiment of the present invention. Detailed Implementation

[0034] The present invention provides a smart responsive lightweight aggregate concrete and its preparation method, which will be further described in detail below with reference to specific embodiments. The advantages and features of the present invention will become clearer from the following description.

[0035] The following is combined with Figure 1 and Figure 2 This invention provides a detailed description of the intelligent responsive lightweight aggregate concrete and its preparation method.

[0036] A smart responsive lightweight aggregate concrete includes cement, lightweight aggregate, fine aggregate, magnetically treated water, magnetic nanoparticles, silica fume, cellulose ether, and a water-reducing agent. The lightweight aggregate is ceramsite with a continuous gradation of 5-20 mm particle size, a bulk density of 900 kg / m³, and a cylinder compressive strength of 4.2 MPa; the fine aggregate is natural sand with a continuous gradation of 0-5 mm particle size, a bulk density of 1.46 kg / m³, an apparent density of 2.68 kg / m³, and a fineness modulus of 2.8; the cement grade is PII52.5, with a 28-day compressive strength of 60.6 MPa and a flexural strength of 9.1 MPa; the magnetic nanoparticles are iron oxide nanoparticles with a particle size of 20-50 nm and a purity ≥99%; the silica fume is silica fume powder with a silica content ≥85%; the cellulose ether is hydroxypropyl methylcellulose with a viscosity of 40000 mPa·s; and the water-reducing agent is a polycarboxylate-based high-performance water-reducing agent with a solid content of 40%.

[0037] A method for preparing intelligent responsive lightweight aggregate concrete includes the following steps:

[0038] Step S1: Add cement, silica fume, fine aggregate, cellulose ether, water-reducing agent, and nanocellulose fibers to a mixer and dry mix for 3 minutes to fully disperse the nanomaterials.

[0039] Step S2: Add the magnetic field-treated water and stir for 4 minutes;

[0040] Step S3: Add the magnetic nanoparticle dispersion containing iron oxide and stir for 6 minutes;

[0041] Step S4: Add pretreated lightweight porous aggregate and stir slowly for 2 minutes to obtain intelligent responsive lightweight aggregate concrete.

[0042] In this embodiment, more preferably, it also includes step S5, molding and intelligent curing: pouring freshly mixed intelligent responsive lightweight aggregate concrete into a mold and compacting it; Figure 1 The molded material was cured in an intelligent curing chamber under the following conditions: temperature 20±2℃, humidity ≥95%, and a weak magnetic field of 0.5T applied for 24 hours. After demolding, it was then placed in... Figure 2 They are aged in a standard curing room until the specified age, during which time external magnetic field stimulation is applied to activate the self-repair function.

[0043] In this embodiment, more preferably, the lightweight porous aggregate is selected from one or more of shale ceramsite, clay ceramsite, or fly ash ceramsite, and phase change materials and repair materials are pre-embedded, while surface functionalization treatment is performed.

[0044] In this embodiment, more preferably, the magnetic nanoparticles include iron(III) oxide with a particle size of 20-50 nm.

[0045] In this embodiment, more preferably, the preparation of magnetic field-treated water includes: taking 1000 mL of ordinary mixed water and placing it in a multi-stage magnetic field treatment device for three-stage treatment, wherein: the first stage pretreatment: setting an alternating electromagnetic field strength of 0.3 T and a frequency of 50 Hz for 10 minutes to destroy the original water molecule cluster structure; the second stage main treatment: setting a pulsed electromagnetic field strength of 0.5~2.0 T and a frequency of 100 Hz for 20 minutes to redirect water molecules to form an ordered structure; the third stage posttreatment: setting a static magnetic field strength of 0.2 T for 5 minutes to stabilize the memory effect; during the treatment, the water temperature is maintained at 20±2℃, and ultrasonic assistance is applied simultaneously at a frequency of 20 kHz and a power of 100 W; after the treatment is completed, it is left to stand for 30 minutes to form a water molecule structure with memory effect and enhanced solubility.

[0046] In this embodiment, more preferably, the magnetic field treatment of water adopts a multi-stage magnetic field treatment technology, including the combined use of alternating electromagnetic fields and pulsed electromagnetic fields. The frequency of the alternating electromagnetic field is 50Hz, and the frequency of the pulsed electromagnetic field is 100Hz. A stable water molecule memory structure is formed through two-stage magnetic field treatment.

[0047] In this embodiment, more preferably, the method for preparing the magnetic nanoparticle dispersion includes: weighing ferric oxide magnetic nanoparticles and adding them to water treated with a magnetic field; dispersing them for 40 minutes at 12,000 rpm using a high-speed disperser, while simultaneously performing ultrasonic dispersion at a frequency of 40 kHz and a power of 200 W; adding a composite dispersant, such as a sodium polycarboxylate-silane coupling agent complex, and continuing dispersion for 20 minutes; thus obtaining a magnetic nanoparticle dispersion with a concentration of 1-5%.

[0048] In particular, during the preparation of the magnetic nanoparticle dispersion, the speed of the high-speed disperser can be dynamically adjusted according to the content of the magnetic nanoparticles: when the content of iron oxide is 1~3g, the speed is 8000~10000rpm; when the content of iron oxide is 3~5g, the speed is 10000~12000rpm, to ensure that the nanoparticles are fully dispersed.

[0049] In this embodiment, more preferably, the surface functionalization treatment of the pretreated lightweight porous aggregate includes: drying the ceramsite at 105°C to constant weight; treating the surface of the ceramsite with low-temperature plasma at a power of 200W for 5 minutes to enhance surface activity; immersing the treated ceramsite in a 2% silane coupling agent solution for 30 minutes to form modified ceramsite with an active surface; immersing the modified ceramsite in a precursor solution containing nano-silica to grow nanoporous structures in situ on the surface of the ceramsite using a sol-gel method; vacuum impregnating the treated ceramsite to fill the pores with liquid phase change material (e.g., paraffin-based) and repair material (e.g., sodium silicate solution), followed by cooling and solidification to encapsulate the pores; and then immersing the ceramsite in magnetically treated water for 40 minutes to fully activate the nanostructure and drain the water.

[0050] Example 1

[0051] A smart responsive lightweight aggregate concrete, wherein the concrete components are specified in kg / m³. 3 The mass ratio is as follows: cement 100; lightweight porous aggregate 150; fine aggregate 45; magnetically treated water 30; water-reducing agent 1; magnetic nanoparticles 0.5~2.0; cellulose ether 0.2; silica fume 8; nanocellulose fiber 2.

[0052] Examples 2 to 8

[0053] The difference between Examples 2 to 4 and Example 1 is that the intensity of the pulsed electromagnetic field is different: 0.5T in Example 1, 1.0T in Example 2, 1.5T in Example 3, and 2.0T in Example 4. Other components and steps are the same. The difference between Examples 5 to 8 and Example 1 is that the content of magnetic nanoparticles (concentration of magnetic nanoparticle dispersion) is different: 5% in Example 1, 4% in Example 5, 3% in Example 6, 2% in Example 7, and 1% in Example 8.

[0054] Performance testing:

[0055] Mechanical properties and intelligent response properties of the concrete specimens prepared in each embodiment were determined. The concrete specimens for compressive strength and splitting tensile strength were 100mm×100mm×100mm cubes; the concrete specimens for flexural strength were 100mm×100mm×400mm prisms; the concrete specimens for elastic modulus were Φ150mm×300mm cylinders; the concrete specimens for magnetic field response were 100mm×100mm×300mm prisms; the concrete specimens for self-healing properties were 100mm×100mm×400mm prisms (with pre-existing cracks); and the concrete specimens for temperature regulation properties were 200mm×200mm×200mm cubes. After molding, the concrete was cured according to standard methods (temperature 20℃±2℃, relative humidity above 95%RH) for 28 days. The performance results are shown in Table 1.

[0056] Table 1 Performance Test Data of Smart Response Lightweight Aggregate Concrete

[0057] NO. <![CDATA[Density / kg / m 3 > Compressive strength / MPa Splitting tensile strength / MPa Flexural strength / MPa Elastic modulus / GPa Magnetic field responsivity / % Self-repair efficiency / % Temperature adjustment range / °C Example 1 1850 32.5 3.2 4.8 18.5 22.5 78.5 ±3.2 Example 2 1860 34.1 3.5 5.2 19.8 26.8 83.2 ±3.6 Example 3 1870 35.3 3.4 5.1 20.2 27.5 84.8 ±3.4 Example 4 1865 34.7 3.3 4.9 19.6 25.2 81.6 ±3.3 Example 5 1855 33.8 3.2 4.9 19.1 24.3 79.8 ±3.1 Example 6 1845 32.9 3.0 4.6 18.4 22.7 76.5 ±2.9 Example 7 1835 32.2 3.1 4.7 17.9 21.8 73.2 ±2.8 Example 8 1825 31.8 2.9 4.4 17.5 20.1 69.8 ±2.6

[0058] All embodiments of the magnetic field-treated water-based intelligent responsive lightweight aggregate concrete exhibited good intelligent response performance. Example 3 (1.5T pulsed electromagnetic field strength, 5% magnetic nanoparticle content) showed the highest magnetic field response rate at 27.5%, indicating that a 1.5T magnetic field strength most effectively activated the magnetocaloric effect of the magnetic nanoparticles. Example 1 (0.5T magnetic field strength) showed the lowest magnetic field response rate at 22.5%, indicating that magnetic field strength is a key factor affecting intelligent response performance. Example 3 also achieved the highest self-healing efficiency of 84.8%, while Example 8 (1% magnetic nanoparticle content) had the lowest self-healing efficiency of 69.8%, demonstrating that the content of magnetic nanoparticles directly affects the self-healing effect.

[0059] Example 3 showed the highest density at 1878 kg / m³, while Example 8 showed the lowest at 1832 kg / m³. Example 3 also exhibited the lowest porosity, indicating that a 5% magnetic nanoparticle content and a 1.5T magnetic field strength can improve the density of concrete. Electrical conductivity decreased with decreasing magnetic nanoparticle content, with Example 3 showing the best conductivity and Example 8 the worst.

[0060] Comparing the mechanical properties of each embodiment, Embodiment 3 exhibits the highest compressive strength of 35.3 MPa, flexural strength of 5.1 MPa, and splitting strength of 3.4 MPa. This is related to its higher magnetic field response rate and self-healing efficiency. Embodiment 8 has relatively lower mechanical properties, but they are still within an acceptable range. Embodiment 1 shows a balanced overall mechanical performance. Embodiment 3 performs best in all performance indicators, but Embodiment 1 has a more balanced overall performance. Embodiment 5 achieves better overall performance by adjusting the content of magnetic nanoparticles.

[0061] Magnetic field modulation technology effectively improved the intelligent response performance of lightweight aggregate concrete, with self-healing efficiency controlled above 70% in all embodiments. Therefore, through multi-level magnetic field treatment and the synergistic effect of magnetic nanoparticles, intelligent responsive lightweight aggregate concrete was successfully prepared. Different magnetic field strengths and magnetic nanoparticle contents significantly affected the concrete performance, allowing for the selection of appropriate mix proportions based on engineering requirements. The above examples represent preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples.

[0062] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A smart responsive lightweight aggregate concrete, characterized in that, The concrete components are specified in kg / m³ 3 The mass ratio is as follows: cement 90~120; lightweight porous aggregate 150~200; fine aggregate 30~60; magnetically treated water 25~35; water-reducing agent 0.5~1.5; magnetic nanoparticles 0.5~2.0; cellulose ether 0.1~0.3; silica fume 5~10; Nanocellulose fibers 1-3.

2. The intelligent responsive lightweight aggregate concrete according to claim 1, characterized in that, The magnetic field-treated water is a water molecule structure with a memory effect formed by treating mixed water with multi-level electromagnetic fields.

3. The intelligent responsive lightweight aggregate concrete according to claim 2, characterized in that, The lightweight porous aggregate is selected from one or more of shale ceramsite, clay ceramsite, or fly ash ceramsite, and pre-embeds phase change materials and repair materials, while performing surface functionalization treatment.

4. The intelligent responsive lightweight aggregate concrete according to claim 3, characterized in that, The magnetic nanoparticles include iron(III) oxide with a particle size of 20-50 nm.

5. A method for preparing intelligent responsive lightweight aggregate concrete according to any one of claims 1 to 4, characterized in that, Includes the following steps: Step S1: Add cement, silica fume, fine aggregate, cellulose ether, water-reducing agent, and nanocellulose fibers to a mixer and dry mix for 3 minutes to fully disperse the nanomaterials. Step S2: Add the magnetic field-treated water and stir for 4 minutes; Step S3: Add the magnetic nanoparticle dispersion containing iron oxide and stir for 6 minutes; Step S4: Add pretreated lightweight porous aggregate and stir slowly for 2 minutes to obtain intelligent responsive lightweight aggregate concrete.

6. The preparation method according to claim 5, characterized in that, The preparation of the magnetic field-treated water includes: taking 1000 mL of ordinary mixed water and placing it in a multi-stage magnetic field treatment device for three-stage treatment. The first stage pretreatment involves setting an alternating electromagnetic field strength of 0.3 T and a frequency of 50 Hz for 10 minutes to disrupt the original water molecule cluster structure; the second stage main treatment involves setting a pulsed electromagnetic field strength of 0.5~2.0 T and a frequency of 100 Hz for 20 minutes to redirect water molecules to form an ordered structure; the third stage posttreatment involves setting a static magnetic field strength of 0.2 T for 5 minutes to stabilize the memory effect; during the treatment, the water temperature is maintained at 20±2℃, and ultrasonic assistance is applied simultaneously at a frequency of 20 kHz and a power of 100 W; after the treatment is completed, the water is allowed to stand for 30 minutes to form a water molecule structure with a memory effect and enhanced solubility.

7. The preparation method according to claim 6, characterized in that, The magnetic field treatment of water employs a multi-stage magnetic field treatment technology, which includes the combined use of alternating electromagnetic fields and pulsed electromagnetic fields. The alternating electromagnetic field has a frequency of 50Hz, and the pulsed electromagnetic field has a frequency of 100Hz. Through two-stage magnetic field treatment, a stable water molecule memory structure is formed.

8. The preparation method according to claim 5, characterized in that, The method for preparing the magnetic nanoparticle dispersion includes: weighing ferric oxide magnetic nanoparticles and adding them to water treated with a magnetic field; dispersing them for 40 minutes at 12,000 rpm using a high-speed disperser, while simultaneously performing ultrasonic dispersion at a frequency of 40 kHz and a power of 200 W; adding a composite dispersant and continuing dispersion for 20 minutes; and obtaining a magnetic nanoparticle dispersion with a concentration of 1-5%.

9. The preparation method according to claim 5, characterized in that, The surface functionalization treatment of the pretreated lightweight porous aggregate includes: drying the ceramsite at 105°C to constant weight; treating the surface of the ceramsite with low-temperature plasma at a power of 200W for 5 minutes to enhance surface activity; immersing the treated ceramsite in a 2% silane coupling agent solution for 30 minutes to form modified ceramsite with an active surface; immersing the modified ceramsite in a precursor solution containing nano-silica to grow nanoporous structures in situ on the surface of the ceramsite using a sol-gel method; vacuum impregnating the treated ceramsite to fill the pores with liquid phase change material and repair material, followed by pore encapsulation after cooling and solidification; and then immersing in magnetically treated water for 40 minutes to fully activate the nanostructure and drain the water.

10. The preparation method according to claim 5, characterized in that, It also includes step S5, molding and intelligent curing: pouring freshly mixed intelligent responsive lightweight aggregate concrete into the mold and compacting it; curing in the intelligent curing chamber under the following conditions: temperature 20±2℃, humidity ≥95%, and applying a weak magnetic field of 0.5T for 24 hours; after demolding, curing in the standard curing room to the specified age, during which external magnetic field stimulation is applied to activate the self-healing function.

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