Pavement crack regeneration grouting repair material and preparation method thereof

Abstract

The invention discloses a pavement crack regeneration grouting repair material and a preparation method thereof, and relates to the technical field of pavement materials. The pavement crack regeneration grouting repair material is prepared from meglumine functionalized nano-porous composite aerogel, waste edible oil, waste rubber powder and regenerated asphalt aggregate, the meglumine functionalized nano-porous composite aerogel is loaded with waste edible oil and waste rubber powder to form a three-system compound with excellent interface bonding, and the recycled asphalt aggregate is modified through the synergistic effect of the porous structure of the aerogel and the filler, so that the high-temperature stability, low-temperature crack resistance and water resistance of the asphalt material are remarkably improved, and the service life of the asphalt material is prolonged. The occurrence of ruts, cracking and falling is effectively reduced, and the effectiveness and durability of pavement crack repairing are favorably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of pavement materials, and specifically refers to a pavement crack regeneration grouting repair material and a preparation method thereof. Background Art

[0002] Asphalt roads have the advantages of low noise, strong wear resistance, short laying period, etc. However, affected by the continuous increase in traffic volume and extreme weather, the problems of road damage and aging are becoming increasingly prominent. Therefore, developing suitable and effective repair materials is an important part of the asphalt pavement crack repair technology.

[0003] Asphalt, used as a pavement crack repair material for road repair, can play an excellent repair role, significantly improve the durability of the pavement, and achieve rapid road traffic. Among them, asphalt has hydrophobicity, can effectively seal cracks, prevent rainwater, snow water, etc. from infiltrating into the pavement structure layer, avoid softening of the base layer and subgrade, extend the service life of the pavement, and the asphalt grouting material can firmly bond the asphalt mixtures on both sides of the crack, restore the integrity of the pavement, and the heated asphalt or emulsified asphalt is easy to pour into narrow cracks and fill them densely.

[0004] Currently, the existing technologies mainly have the following problems:

[0005] Traditional asphalt materials are prone to softening in high-temperature environments, resulting in a decrease in material strength, problems such as flow deformation or bond failure, and become brittle at low temperatures, leading to cracking, which further limits the durability of the repair materials. Summary of the Invention

[0006] In view of the above situation, to overcome the defects of the existing technologies, the present invention provides a pavement crack regeneration grouting repair material, which comprises the following components in parts by weight: 40-60 parts of glucosamine-functionalized nanoporous composite aerogel, 10-20 parts of waste cooking oil, 10-20 parts of waste rubber powder, and 80-100 parts of recycled asphalt aggregate.

[0007] The glucosamine-functionalized nanoporous composite aerogel comprises the following components in parts by weight: 40-50 parts of graphene oxide, 10-30 parts of carboxylated carbon nanotubes, 6-10 parts of waterborne polyurethane, 60-80 parts of N-methyl-D-glucosamine, and 10-14 parts of sodium ascorbate.

[0008] The recycled asphalt aggregate is obtained by using a milling machine to strip the old asphalt pavement layer by layer, then using a jaw crusher to initially crush the large asphalt mixture to a particle size ≤ 50 mm, and then performing fine crushing through a cone crusher and vibrating screening to obtain a 1-3 mm recycled material.

[0009] The preparation method of the glucosamine-functionalized nanoporous composite aerogel specifically comprises the following steps:

[0010] (1) Add 2.0 - 3.0 g of graphite powder to 70 mL of concentrated sulfuric acid, cool it in an ice bath to 0 °C and slowly add 9.0 g of potassium permanganate. Keep the temperature below 20 °C and stir for 3 - 4 h. Then raise the temperature of the mixed solution to 35 - 40 °C and stir for 20 - 30 min. Add 150 mL of deionized water and raise the temperature to 95 °C and stir for 10 - 15 min. Continue stirring after the heating ends. After cooling, add 500 mL of deionized water and 15 mL of hydrogen peroxide solution with a mass fraction of 30%. Then centrifuge and wash with hydrochloric acid solution with a mass fraction of 4% until the pH of the supernatant is 7.0. Ultrasonically treat for 10 - 20 min, concentrate, and obtain a graphene oxide dispersion. Among them, the two-dimensional sheet structure and high specific surface area of graphene oxide enable it to form a physical cross-linking network with asphalt molecules, effectively disperse stress, and reduce crack propagation. The high thermal conductivity and sheet barrier effect of graphene oxide can slow down the fluidity of asphalt at high temperatures and reduce rutting deformation. Graphene oxide can also enhance the low-temperature crack resistance by inhibiting the low-temperature embrittlement of asphalt, reducing the shrinkage stress. At the same time, the hydrophobicity and sheet barrier of graphene oxide can block water penetration, prevent water molecules from eroding the interface between asphalt and aggregates, and reduce the crack risk caused by water damage;

[0011] (2) Measure 100 mL of the graphene oxide dispersion obtained in step (1), ultrasonically treat it at room temperature for 1 - 2 h, pour it into a 200 mL polytetrafluoroethylene hydrothermal reaction kettle, add 0.1 - 0.3 g of carboxylated carbon nanotubes, then add sodium ascorbate, and then dropwise add 60 - 100 mg of waterborne polyurethane. Stir for 20 - 30 min to obtain a nano-porous composite aerogel dispersion. Sodium ascorbate promotes the cross-linking and bonding of graphene oxide and carboxylated carbon nanotubes. Under the strong bonding of waterborne polyurethane, a stable, uniform, and continuous three-dimensional porous network is formed, which can be used as a reinforcing skeleton for structural support. It not only effectively prevents the agglomeration of graphene oxide and carboxylated carbon nanotubes, but also improves the compressive strength and elastic modulus of asphalt, reducing the crack propagation caused by load on the road surface. The addition of graphene oxide and carboxylated carbon nanotubes can increase the softening point of asphalt, reduce the temperature sensitivity, and reduce high-temperature rutting deformation. Their high thermal conductivity can also promote the uniform distribution of heat from sunlight or external heat sources, accelerate the fluidity of asphalt, and promote crack self-healing. And waterborne polyurethane itself has good flexibility and can still maintain elasticity in a low-temperature environment, avoiding crack propagation caused by temperature shrinkage;

[0012] (3) Dissolve N-methyl-D-glucosamine in 40 mL of water, and then add it to the nano-porous composite aerogel dispersion described in step (2). React at 80 - 90 °C for 6 - 8 h, cool to room temperature, take out the black hydrogel and immerse it in distilled water until the aqueous solution becomes colorless. Then, first place it in a -20 °C refrigerator for 12 h of pretreatment, and then freeze-dry it at -80 °C for 24 - 48 h to obtain glucosamine-functionalized nano-porous composite aerogel. N-methyl-D-glucosamine forms a more stable three-dimensional network through cross-linking with graphene oxide or waterborne polyurethane, enhancing the mechanical strength of the aerogel and preventing structural collapse after loading other components. The glucosamine-functionalized nano-porous composite aerogel has an ultra-high porosity and nano-scale pore structure, which can penetrate deep into the interior of cracks, fill tiny voids, form a dense repair layer, and reduce the risk of material shedding caused by water penetration. Moreover, the porous structure of the aerogel has a certain heat insulation effect, delaying the softening of asphalt at high temperatures and improving the rutting resistance. At the same time, the flexible structure of the composite aerogel can absorb part of the stress and relieve the crack formation caused by low-temperature shrinkage;

[0013] Preferably, in step (1), the content of the graphene oxide dispersion is 4 - 5 mg / mL, which is beneficial to the formation of a denser three-dimensional network structure and provides more cross-linking points of nanosheets;

[0014] Preferably, in step (2), the addition amount of sodium ascorbate is 0.10 - 0.14 g. Sodium ascorbate partially removes the oxygen-containing functional groups on the surface of graphene oxide and restores the conjugated structure of graphene. It not only improves the thermal conductivity and hydrophobicity but also makes it easier to combine with carboxylated carbon nanotubes through π-π stacking or van der Waals forces;

[0015] Preferably, in step (3), the addition amount of N-methyl-D-glucosamine is 0.6 - 0.8 g. The introduction of N-methyl-D-glucosamine enhances the mechanical toughness of the aerogel, making it not easy to break under traffic loads, extending the service life of the repair material, and further optimizing the weather resistance of the aerogel, so that it can still maintain stability in low-temperature or humid environments.

[0016] The present invention also provides a preparation method for a pavement crack regeneration grouting repair material, which specifically includes the following steps:

[0017] S1. Filter the dirt and suspended matter in the waste oil collected from restaurants to obtain waste cooking oil. Crush the waste rubber and collect the waste rubber powder with a particle size of 50 - 70 μm. Among them, fatty acids and glycerides in the waste cooking oil can soften asphalt, improve its low-temperature crack resistance, reduce brittle cracking in winter, and the polar molecules of the oil can better combine with asphalt, enhancing the adhesion to the crack wall and preventing water penetration. The high elasticity of the waste rubber powder enables the asphalt to rebound after being compressed in the crack, adapt to crack deformation, reduce the risk of debonding, and can also form a network structure after mixing with asphalt, enhancing the adhesion to the old road surface and preventing water intrusion. Moreover, the waste rubber powder can increase the viscosity of asphalt through physical cross-linking, improve the anti-deformation ability, and is beneficial to the high-temperature stability of asphalt materials;

[0018] S2. Place the recycled asphalt aggregate in an oven at 150 - 160 °C and heat it for 1 - 2 h. Take it out, then add the waste cooking oil and waste rubber powder described in step S1, mix for 10 - 30 min, add glucosamine-functionalized nanoporous composite aerogel, and then use a high-speed shear machine to shear and mix at a temperature of 100 - 120 °C at a rate of 300 rpm for 30 - 60 min, and carry out the operation under nitrogen protection to obtain a pavement crack regeneration grouting repair material. The network structure of the glucosamine-functionalized nanoporous composite aerogel adsorbs and wraps the waste rubber powder, reducing the agglomeration of the waste rubber powder and forming a skeleton-filled composite system. At the same time, the glucosamine-functionalized nanoporous composite aerogel can promote the uniform dispersion of the waste cooking oil in the porous structure of the aerogel by reducing the oil-water interfacial tension, which is beneficial to the interfacial combination of the aerogel, waste rubber powder, and waste cooking oil. Among them, the waste cooking oil can be used as a wetting agent for the aerogel and waste rubber powder to improve their compatibility and dispersibility in asphalt. Therefore, the aerogel-waste cooking oil-waste rubber powder ternary system enhances the high-temperature stability, low-temperature crack resistance, and water resistance of the recycled asphalt aggregate through the synergistic effect of multiple components, reduces the risks of rutting, cracking, and peeling, and improves the repair effect and durability of pavement cracks.

[0019] The beneficial effects achieved by the present invention are as follows:

[0020] The present invention forms a three-system composite with excellent interface bonding by loading waste cooking oil and waste rubber powder on the meglumine functionalized nanoporous composite aerogel, and modifies the recycled asphalt aggregate through the synergistic effect of the porous structure of the aerogel and the filler, thereby significantly improving the high-temperature stability, low-temperature crack resistance and water resistance of the asphalt material, effectively reducing the occurrence of rutting, cracking and shedding, and being beneficial to improving the effectiveness and durability of road crack repair; in the meglumine functionalized nanoporous composite aerogel, sodium ascorbate promotes the cross-linking of graphene oxide and carboxylated carbon nanotubes, and the carboxylated carbon nanotubes The addition of reduces the stacking of graphene oxide sheets, maintains the porous structure while maintaining the continuity of the network. Under the super strong bonding of water-based polyurethane, a stable, uniform, and continuous three-dimensional highly porous network structure is formed, providing skeleton support and mechanical stability. It not only improves the compressive strength and elastic modulus of asphalt, reduces the expansion of cracks caused by load on the road surface, but also effectively isolates the infiltration of water and enhances the adhesion to the cracks. Among them, the addition of graphene oxide and carboxylated carbon nanotubes increases the softening point of asphalt, reduces temperature sensitivity, and reduces high-temperature rutting deformation. The high thermal conductivity of the two can promote sunlight Or the heat from the external heat source is evenly distributed, which accelerates the fluidity of asphalt and promotes self-healing of cracks. The water-based polyurethane itself has good flexibility and can maintain elasticity in low temperature environments, avoiding crack expansion caused by temperature shrinkage. The good compatibility of water-based polyurethane with graphene oxide and carboxylated carbon nanotubes optimizes the network structure of the aerogel, which is conducive to better exerting the barrier and thermal conductivity properties and reducing the adverse effects of high temperature and moisture. Then, N-methyl-D-glucosamine is used as a cross-linking agent to cross-link and modify the nanoporous composite aerogel, further forming a more stable three-dimensional network structure. , increasing the specific surface area and pore size distribution. The methylglucamine functionalized nanoporous composite aerogel, relying on its ultra-high porosity and nanoscale pore structure, can penetrate deep into the cracks, fill tiny gaps, form a dense repair layer, and reduce the risk of material shedding caused by water penetration. Its porous structure has a certain heat insulation effect, delaying the softening of asphalt at high temperatures, thereby improving the rutting resistance. Its flexible structure can absorb part of the stress and alleviate the formation of cracks caused by low-temperature shrinkage. Among them, N-methyl-D-glucosamine improves the loading stability of aerogels for waste cooking oil and waste rubber powder through interface modification and structural strengthening.The network structure of the meglumine-functionalized nanoporous composite aerogel not only adsorbs and encapsulates waste rubber powder, reducing the agglomeration of waste rubber powder, but also improves the uniform dispersion of waste cooking oil in the porous structure of the aerogel by reducing the oil-water interfacial tension, which is beneficial to the interfacial bonding of the aerogel, waste rubber powder and waste cooking oil. Waste cooking oil can be used as a wetting agent for the aerogel and waste rubber powder, enhancing their compatibility and dispersion in asphalt. Therefore, through the synergistic effect among the components of the aerogel-waste cooking oil-waste rubber powder ternary system, the functions of the aerogel and fillers are maximally utilized, significantly improving the modification effect on recycled asphalt aggregate, enhancing the high-temperature stability, low-temperature crack resistance and water resistance of the recycled asphalt aggregate, and reducing the risks of rutting, cracking and peeling. The present invention uses meglumine-functionalized nanoporous composite aerogel, waste cooking oil, waste rubber powder and recycled asphalt aggregate to prepare a pavement crack regeneration grouting repair material, which improves the high-temperature stability, low-temperature crack resistance and water resistance, and effectively reduces the occurrence of rutting, cracking and peeling. Description of the Drawings

[0021] Figure 1 SEM image of the pavement crack regeneration grouting repair material prepared in Example 1 of the present invention;

[0022] Figure 2 Graph of dynamic stability results for Examples 1-4 and Comparative Examples 1-3 of the present invention;

[0023] Figure 3 Graph of low-temperature bending performance results for Examples 1-4 and Comparative Examples 1-3 of the present invention;

[0024] Figure 4 Graph of flushing loss rate results for Examples 1-4 and Comparative Examples 1-3 of the present invention. Detailed Description of the Invention

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to the described content can be applied to the present invention. The preferred implementation methods and materials described herein are only for illustrative purposes and do not limit the content of this application.

[0027] The experimental methods in the following examples are all conventional methods unless otherwise specified; the test materials used in the following examples are all obtained from commercial channels unless otherwise specified.

[0028] Example 1

[0029] This example presents a pavement crack regeneration grouting repair material, which includes the following components in parts by weight: 60 parts of glucosamine-functionalized nanoporous composite aerogel, 20 parts of waste cooking oil, 20 parts of waste rubber powder, and 100 parts of recycled asphalt aggregate.

[0030] The glucosamine-functionalized nanoporous composite aerogel includes the following components in parts by weight: 50 parts of graphene oxide, 30 parts of carboxylated carbon nanotubes, 10 parts of waterborne polyurethane, 80 parts of N-methyl-D-glucosamine, and 14 parts of sodium ascorbate.

[0031] The recycled asphalt aggregate is obtained by using a milling machine to strip the old asphalt pavement layer by layer, then using a jaw crusher to primarily crush the large asphalt mixture to a particle size of ≤50 mm, and then finely pulverizing it through a cone crusher and vibrating screen to obtain 3-mm recycled materials.

[0032] The preparation method of the glucosamine-functionalized nanoporous composite aerogel specifically includes the following steps:

[0033] (1) Add 3.0 g of graphite powder to 70 mL of concentrated sulfuric acid, cool it in an ice bath to 0 °C, and slowly add 9.0 g of potassium permanganate. Keep the temperature below 20 °C and stir for 4 h. Then raise the temperature of the mixed solution to 40 °C and stir for 30 min. Add 150 mL of deionized water and raise the temperature to 95 °C and stir for 15 min. Continue stirring after heating ends. After cooling, add 500 mL of deionized water and 15 mL of a 30% hydrogen peroxide solution by mass fraction, and then centrifuge and wash with a 4% hydrochloric acid solution by mass fraction until the pH of the supernatant is 7.0. Ultrasonically treat for 20 min and concentrate to obtain a graphene oxide dispersion. The content of the graphene oxide dispersion is 5 mg / mL, which is beneficial to forming a denser three-dimensional network structure and providing more cross-linking points of nanosheets. Among them, the two-dimensional sheet structure and high specific surface area of graphene oxide enable it to form a physical cross-linking network with asphalt molecules, effectively disperse stress, and reduce crack propagation. The high thermal conductivity and sheet barrier effect of graphene oxide can slow down the fluidity of asphalt at high temperatures and reduce rutting deformation. Graphene oxide can also enhance the low-temperature crack resistance by inhibiting the low-temperature embrittlement of asphalt and reducing the shrinkage stress. At the same time, the hydrophobicity and sheet barrier of graphene oxide can block water penetration, prevent water molecules from eroding the interface between asphalt and aggregates, and reduce the crack risk caused by water damage;

[0034] (2) Measure 100 mL of the graphene oxide dispersion described in step (1), ultrasonically treat it for 2 h at room temperature, pour it into a 200 mL polytetrafluoroethylene hydrothermal reaction kettle, add 0.3 g of carboxylated carbon nanotubes, and then add sodium ascorbate. The addition amount of sodium ascorbate is 0.14 g. Sodium ascorbate removes some of the oxygen-containing functional groups on the surface of graphene oxide, restoring the conjugated structure of graphene. This not only improves the thermal conductivity and hydrophobicity but also makes it easier to combine with carboxylated carbon nanotubes through π-π stacking or van der Waals forces. Then, add 100 mg of waterborne polyurethane and stir for 30 min to obtain a nanoporous composite aerogel dispersion. Sodium ascorbate promotes the cross-linking and combination of graphene oxide and carboxylated carbon nanotubes. Under the strong adhesion of waterborne polyurethane, a stable, uniform, and continuous three-dimensional porous network is formed, which can be used as a reinforcing framework for structural support. It not only effectively prevents the agglomeration of graphene oxide and carboxylated carbon nanotubes but also improves the compressive strength and elastic modulus of asphalt, reducing the crack propagation caused by traffic loads on the road surface. The addition of graphene oxide and carboxylated carbon nanotubes can increase the softening point of asphalt, reduce the temperature sensitivity, and decrease the rutting deformation at high temperatures. The high thermal conductivity of both can promote the uniform distribution of heat from sunlight or external heat sources, accelerate the fluidity of asphalt, and promote crack self-healing. Moreover, waterborne polyurethane itself has good flexibility and can still maintain elasticity in a low-temperature environment, avoiding crack propagation caused by temperature shrinkage.

[0035] (3) Dissolve N-methyl-D-glucamine in 40 mL of water. The addition amount of N-methyl-D-glucamine is 0.8 g. The introduction of N-methyl-D-glucamine enhances the mechanical toughness of the aerogel, making it not easy to break under traffic loads and extending the service life of the repair material. It can also further optimize the weather resistance of the aerogel, enabling it to maintain stability in low-temperature or humid environments. Then add it to the nanoporous composite aerogel dispersion described in step (2), react at 90 °C for 8 h, cool to room temperature, take out the black hydrogel and immerse it in distilled water until the aqueous solution becomes colorless. Then, first place it in a -20 °C refrigerator for 12 h for pretreatment, and then freeze-dry it at -80 °C for 48 h to obtain N-methyl-D-glucamine-functionalized nanoporous composite aerogel. N-methyl-D-glucamine forms a more stable three-dimensional network through cross-linking with graphene oxide or waterborne polyurethane, enhancing the mechanical strength of the aerogel and preventing structural collapse after loading other components. The N-methyl-D-glucamine-functionalized nanoporous composite aerogel has an ultra-high porosity and nanoscale pore structure, which can penetrate into the interior of cracks, fill small voids, and form a dense repair layer, reducing the risk of material shedding caused by water penetration. Moreover, the porous structure of the aerogel has a certain heat insulation effect, delaying the softening of asphalt at high temperatures and improving the rutting resistance. At the same time, the flexible structure of the composite aerogel can absorb part of the stress and relieve the crack formation caused by low-temperature shrinkage.

[0036] This embodiment provides a preparation method of a pavement crack regeneration grouting repair material, which specifically includes the following steps:

[0037] S1. Filter the dirt and suspended substances in the waste oil collected from restaurants to obtain waste cooking oil. Crush the waste rubber and collect the waste rubber powder with a particle size of 70 μm. Among them, the fatty acids and glycerides in the waste cooking oil can soften the asphalt, improve its low-temperature crack resistance, reduce brittle cracking in winter, and the polar molecules of the oil can better combine with the asphalt, enhancing the adhesion to the crack wall and preventing water penetration. The high elasticity of the waste rubber powder enables the asphalt to rebound after being compressed in the crack, adapt to crack deformation, reduce the risk of debonding, and can also form a network structure after mixing with the asphalt, enhancing the adhesion to the old pavement and preventing water intrusion. In addition, the waste rubber powder can increase the asphalt viscosity through physical cross-linking, improve the anti-deformation ability, and is beneficial to the high-temperature stability of the asphalt material.

[0038] S2. Place the recycled asphalt aggregate in an oven at 160 °C and heat for 2 h, then take it out. Next, add the waste cooking oil and waste rubber powder described in step S1, mix for 30 min, then add the glucosamine-functionalized nanoporous composite aerogel, and then use a high-speed shear machine to shear and mix at a rate of 300 rpm at a temperature of 120 °C for 60 min under nitrogen protection to obtain the pavement crack regeneration grouting repair material. The network structure of the glucosamine-functionalized nanoporous composite aerogel adsorbs and wraps the waste rubber powder, reducing the agglomeration of the waste rubber powder and forming a skeleton-filled composite system. At the same time, the glucosamine-functionalized nanoporous composite aerogel can promote the uniform dispersion of the waste cooking oil in the porous structure of the aerogel by reducing the oil-water interfacial tension, which is beneficial to the interfacial combination of the aerogel, waste rubber powder, and waste cooking oil. Among them, the waste cooking oil can be used as a wetting agent for the aerogel and waste rubber powder to improve their compatibility and dispersion in the asphalt. Therefore, the aerogel-waste cooking oil-waste rubber powder ternary system enhances the high-temperature stability, low-temperature crack resistance, and water resistance of the recycled asphalt aggregate through the synergistic effect of multiple components, reduces the risks of rutting, cracking, and peeling, and improves the repair effect and durability of pavement cracks.

[0039] In this embodiment, a scanning electron microscope is used to observe the micro-morphology of the prepared pavement crack regeneration grouting repair material. Figure 1 It is the SEM image of the pavement crack regeneration grouting repair material prepared in Example 1 magnified 1000 times. As shown in the figure, the pavement crack regeneration grouting repair material prepared in this embodiment shows good dispersion compatibility.

[0040] Example 2

[0041] This embodiment provides a pavement crack regeneration grouting repair material, which comprises the following components in parts by weight: 40 parts of glucosamine-functionalized nanoporous composite aerogel, 10 parts of waste cooking oil, 10 parts of waste rubber powder, and 80 parts of recycled asphalt aggregate.

[0042] The glucosamine-functionalized nanoporous composite aerogel comprises the following components in parts by weight: 40 parts of graphene oxide, 10 parts of carboxylated carbon nanotubes, 6 parts of waterborne polyurethane, 60 parts of N-methyl-D-glucosamine, and 10 parts of sodium ascorbate.

[0043] The recycled asphalt aggregate is obtained by using a milling machine to strip the old asphalt pavement layer by layer, then using a jaw crusher to primarily crush the large asphalt mixture to a particle size of ≤50 mm, and then performing fine crushing through a cone crusher and vibrating screen to obtain a 1-mm recycled material.

[0044] The preparation method of the glucosamine-functionalized nanoporous composite aerogel specifically comprises the following steps:

[0045] (1) Add 2.0 g of graphite powder to 70 mL of concentrated sulfuric acid, cool it in an ice bath to 0 °C and slowly add 9.0 g of potassium permanganate. Keep the temperature below 20 °C and stir for 3 h, then raise the temperature of the mixed solution to 35 °C and stir for 20 min. Add 150 mL of deionized water and raise the temperature to 95 °C and stir for 10 min. After the heating is completed, continue stirring. After cooling, add 500 mL of deionized water and 15 mL of a 30% hydrogen peroxide solution by mass fraction, and then centrifuge and wash with a 4% hydrochloric acid solution by mass fraction until the pH of the supernatant is 7.0. Perform ultrasonic treatment for 10 min and concentrate to obtain a graphene oxide dispersion. The content of the graphene oxide dispersion is 4 mg / mL, which is beneficial to forming a denser three-dimensional network structure and providing more cross-linking points of nanosheets. Among them, the two-dimensional sheet structure and high specific surface area of graphene oxide enable it to form a physical cross-linking network with asphalt molecules, effectively disperse stress, and reduce crack propagation. The high thermal conductivity and sheet barrier effect of graphene oxide can slow down the fluidity of asphalt at high temperatures and reduce rutting deformation. Graphene oxide can also enhance the low-temperature crack resistance by inhibiting the low-temperature embrittlement of asphalt and reducing the shrinkage stress. At the same time, the hydrophobicity and sheet barrier of graphene oxide can block water penetration and prevent water molecules from eroding the interface between asphalt and aggregate, reducing the crack risk caused by water damage;

[0046] (2)Measure 100 mL of the graphene oxide dispersion described in step (1), ultrasonically treat it for 1 h at room temperature, pour it into a 200 mL polytetrafluoroethylene hydrothermal reaction kettle, add 0.1 g of carboxylated carbon nanotubes, and then add sodium ascorbate. The addition amount of sodium ascorbate is 0.10 g. Sodium ascorbate removes some of the oxygen-containing functional groups on the surface of graphene oxide, restoring the conjugated structure of graphene. This not only improves the thermal conductivity and hydrophobicity but also makes it easier to combine with carboxylated carbon nanotubes through π-π stacking or van der Waals forces. Then, add 60 mg of waterborne polyurethane and stir for 20 min to obtain a nanoporous composite aerogel dispersion. Sodium ascorbate promotes the cross-linking and combination of graphene oxide and carboxylated carbon nanotubes. Under the strong adhesion of waterborne polyurethane, a stable, uniform, and continuous three-dimensional porous network is formed, which can be used as a reinforcing framework for structural support. It not only effectively prevents the agglomeration of graphene oxide and carboxylated carbon nanotubes but also improves the compressive strength and elastic modulus of asphalt, reducing the crack propagation caused by traffic loads on the road surface. The addition of graphene oxide and carboxylated carbon nanotubes can increase the softening point of asphalt, reduce the temperature sensitivity, and decrease the high-temperature rutting deformation. The high thermal conductivity of both can also promote the uniform distribution of heat from sunlight or external heat sources, accelerating the fluidity of asphalt and promoting crack self-healing. Waterborne polyurethane itself has good flexibility and can still maintain elasticity in a low-temperature environment, avoiding crack propagation caused by temperature shrinkage;

[0047] (3)Dissolve N-methyl-D-glucamine in 40 mL of water. The addition amount of N-methyl-D-glucamine is 0.6 g. The introduction of N-methyl-D-glucamine enhances the mechanical toughness of the aerogel, making it not easily fragmented under traffic loads and extending the service life of the repair material. It can also further optimize the weather resistance of the aerogel, enabling it to maintain stability in low-temperature or humid environments. Then add it to the nanoporous composite aerogel dispersion described in step (2), react at 80 °C for 6 h, cool to room temperature, take out the black hydrogel and immerse it in distilled water until the aqueous solution becomes colorless. Then, first pre-treat it by freezing in a -20 °C refrigerator for 12 h and then freeze-dry it at -80 °C for 24 h to obtain N-methyl-D-glucamine-functionalized nanoporous composite aerogel. N-methyl-D-glucamine forms a more stable three-dimensional network through cross-linking with graphene oxide or waterborne polyurethane, enhancing the mechanical strength of the aerogel and preventing structural collapse after loading other components. The N-methyl-D-glucamine-functionalized nanoporous composite aerogel has an ultra-high porosity and nano-scale pore structure, which can penetrate deep into the cracks, fill the microvoids, and form a dense repair layer, reducing the risk of material shedding caused by water penetration. The porous structure of the aerogel also has a certain heat insulation effect, delaying the softening of asphalt at high temperatures and improving the rutting resistance. At the same time, the flexible structure of the composite aerogel can absorb part of the stress and relieve the crack formation caused by low-temperature shrinkage.

[0048] This embodiment provides a preparation method of a pavement crack regeneration grouting repair material, which specifically includes the following steps:

[0049] S1. Filter the dirt and suspended substances in the waste oil collected from restaurants to obtain waste cooking oil. Crush the waste rubber and collect waste rubber powder with a particle size of 50 μm. Among them, fatty acids and glycerides in the waste cooking oil can soften asphalt, improve its low-temperature crack resistance, reduce brittle cracking in winter, and the polar molecules of the oil can better combine with asphalt, enhancing the adhesion to the crack wall and preventing water penetration. The high elasticity of the waste rubber powder enables the asphalt to rebound after being compressed in the crack, adapt to crack deformation, reduce the risk of debonding, and can also form a network structure after mixing with asphalt, enhancing the bonding with the old pavement and preventing water intrusion. Moreover, the waste rubber powder can increase the viscosity of asphalt through physical cross-linking, improve the anti-deformation ability, and is beneficial to the high-temperature stability of asphalt materials.

[0050] S2. Place the recycled asphalt aggregate in an oven at 150 °C and heat it for 1 h, then take it out. Next, add the waste cooking oil and waste rubber powder described in step S1, mix for 10 min, then add glucosamine-functionalized nanoporous composite aerogel, and then use a high-speed shear machine to shear and mix at a temperature of 100 °C and a rate of 300 rpm for 30 min, and carry out the operation under nitrogen protection to obtain a pavement crack regeneration grouting repair material. The network structure of the glucosamine-functionalized nanoporous composite aerogel adsorbs and wraps the waste rubber powder, reducing the agglomeration of the waste rubber powder and forming a skeleton-filled composite system. At the same time, the glucosamine-functionalized nanoporous composite aerogel can promote the uniform dispersion of the waste cooking oil in the porous structure of the aerogel by reducing the oil-water interfacial tension, which is beneficial to the interfacial combination of the aerogel, waste rubber powder, and waste cooking oil. Among them, the waste cooking oil can be used as a wetting agent for the aerogel and waste rubber powder to improve their compatibility and dispersibility in asphalt. Therefore, the aerogel-waste cooking oil-waste rubber powder ternary system enhances the high-temperature stability, low-temperature crack resistance, and water resistance of the recycled asphalt aggregate through the synergistic effect of multiple components, reduces the risks of rutting, cracking, and peeling, and improves the repair effect and durability of pavement cracks.

[0051] Example 3

[0052] This embodiment provides a pavement crack regeneration grouting repair material, which includes the following components in parts by weight: 50 parts of glucosamine-functionalized nanoporous composite aerogel, 15 parts of waste cooking oil, 15 parts of waste rubber powder, and 90 parts of recycled asphalt aggregate.

[0053] The glucosamine-functionalized nanoporous composite aerogel includes the following components in parts by weight: 45 parts of graphene oxide, 20 parts of carboxylated carbon nanotubes, 8 parts of waterborne polyurethane, 70 parts of N-methyl-D-glucosamine, and 12 parts of sodium ascorbate.

[0054] Recycled asphalt aggregate is obtained by using a milling machine to strip the old asphalt pavement layer by layer, then using a jaw crusher to initially crush the large asphalt mixture to a particle size of ≤50 mm, and then performing fine crushing through a cone crusher and vibrating screening to obtain a recycled material with a particle size of 2 mm.

[0055] A preparation method of methylglucamine-functionalized nanoporous composite aerogel specifically includes the following steps:

[0056] (1) Add 2.5 g of graphite powder to 70 mL of concentrated sulfuric acid, cool it in an ice bath to 0 °C and slowly add 9.0 g of potassium permanganate. Keep the temperature below 20 °C and stir for 3.5 h. Then raise the temperature of the mixed solution to 37.5 °C and stir for 25 min. Add 150 mL of deionized water and raise the temperature to 95 °C and stir for 12.5 min. After the heating is completed, continue to stir. After cooling, add 500 mL of deionized water and 15 mL of a 30% hydrogen peroxide solution by mass fraction, and then centrifugally wash with a 4% hydrochloric acid solution by mass fraction until the pH of the supernatant is 7.0. Perform ultrasonic treatment for 15 min and concentrate to obtain a graphene oxide dispersion. The content of the graphene oxide dispersion is 4.5 mg / mL, which is beneficial to forming a denser three-dimensional network structure and providing more cross-linking points of nanosheets. Among them, the two-dimensional sheet structure and high specific surface area of graphene oxide enable it to form a physical cross-linking network with asphalt molecules, effectively disperse stress, and reduce crack propagation. The high thermal conductivity and sheet barrier effect of graphene oxide can slow down the fluidity of asphalt at high temperatures and reduce rutting deformation. Graphene oxide can also enhance the low-temperature crack resistance by inhibiting the low-temperature embrittlement of asphalt, reducing the shrinkage stress. At the same time, the hydrophobicity and sheet barrier of graphene oxide can block water penetration, prevent water molecules from eroding the interface between asphalt and aggregate, and reduce the crack risk caused by water damage;

[0057] (2)Measure 100 mL of the graphene oxide dispersion described in step (1), ultrasonically treat it at room temperature for 1.5 h, pour it into a 200 mL polytetrafluoroethylene hydrothermal reaction kettle, add 0.2 g of carboxylated carbon nanotubes, and then add sodium ascorbate. The addition amount of sodium ascorbate is 0.12 g. Sodium ascorbate removes some of the oxygen-containing functional groups on the surface of graphene oxide and restores the conjugated structure of graphene. This not only improves the thermal conductivity and hydrophobicity but also makes it easier to combine with carboxylated carbon nanotubes through π-π stacking or van der Waals forces. Then, add 80 mg of aqueous polyurethane and stir for 25 min to obtain a nano-porous composite aerogel dispersion. Sodium ascorbate promotes the cross-linking and combination of graphene oxide and carboxylated carbon nanotubes. Under the strong bonding of aqueous polyurethane, a stable, uniform, and continuous three-dimensional porous network is formed, which can be used as a reinforcing framework for structural support. It not only effectively prevents the aggregation of graphene oxide and carboxylated carbon nanotubes but also improves the compressive strength and elastic modulus of asphalt, reduces the crack propagation caused by traffic loads on the road surface. The addition of graphene oxide and carboxylated carbon nanotubes can increase the softening point of asphalt, reduce the temperature sensitivity, and decrease the high-temperature rutting deformation. The high thermal conductivity of both can also promote the uniform distribution of heat from sunlight or external heat sources, accelerate the fluidity of asphalt, and promote crack self-healing. Aqueous polyurethane itself has good flexibility and can still maintain elasticity in a low-temperature environment, avoiding crack propagation caused by temperature shrinkage;

[0058] (3)Dissolve N-methyl-D-glucamine in 40 mL of water. The addition amount of N-methyl-D-glucamine is 0.7 g. The introduction of N-methyl-D-glucamine enhances the mechanical toughness of the aerogel, making it not easy to break under traffic loads and extending the service life of the repair material. It can also further optimize the weather resistance of the aerogel, enabling it to maintain stability in low-temperature or humid environments. Then add it to the nano-porous composite aerogel dispersion described in step (2), react at 85 °C for 7 h, cool to room temperature, take out the black hydrogel and immerse it in distilled water until the aqueous solution becomes colorless. Then, first place it in a -20 °C refrigerator for 12 h for pretreatment, and then freeze-dry it at -80 °C for 36 h to obtain N-methyl-D-glucamine-functionalized nano-porous composite aerogel. N-methyl-D-glucamine forms a more stable three-dimensional network through cross-linking with graphene oxide or aqueous polyurethane, enhancing the mechanical strength of the aerogel and preventing structural collapse after loading other components. The N-methyl-D-glucamine-functionalized nano-porous composite aerogel has an ultra-high porosity and nano-scale pore structure, which can penetrate deep into the cracks, fill the microvoids, and form a dense repair layer, reducing the risk of material detachment caused by water penetration. The porous structure of the aerogel also has a certain heat insulation effect, delaying the softening of asphalt at high temperatures and improving the rutting resistance. At the same time, the flexible structure of the composite aerogel can absorb part of the stress and relieve the crack formation caused by low-temperature shrinkage.

[0059] This embodiment provides a preparation method for a pavement crack regeneration grouting repair material, which specifically includes the following steps:

[0060] S1. Filter the dirt and suspended matter in the waste oil collected from restaurants to obtain waste cooking oil. Crush the waste rubber and collect the waste rubber powder with a particle size of 60 μm. Among them, fatty acids and glycerides in the waste cooking oil can soften asphalt, improve its low-temperature crack resistance, reduce brittle cracking in winter, and the polar molecules of the oil can better combine with asphalt, enhancing the adhesion to the crack wall and preventing water penetration. The high elasticity of the waste rubber powder enables the asphalt to rebound after being compressed in the crack, adapt to crack deformation, reduce the risk of debonding, and can also form a network structure after mixing with asphalt, enhancing the bond with the old pavement and preventing water intrusion. In addition, the waste rubber powder can increase the viscosity of asphalt through physical cross-linking, improve the anti-deformation ability, and is beneficial to the high-temperature stability of the asphalt material;

[0061] S2. Place the recycled asphalt aggregate in an oven at 155 °C and heat it for 1.5 h. Take it out, then add the waste cooking oil and waste rubber powder described in step S1, mix for 20 min, then add the glucosamine-functionalized nanoporous composite aerogel, and then use a high-speed shear machine to shear and mix at a rate of 300 rpm at a temperature of 110 °C for 45 min, and carry out the operation under nitrogen protection to obtain the pavement crack regeneration grouting repair material. The network structure of the glucosamine-functionalized nanoporous composite aerogel adsorbs and wraps the waste rubber powder, reducing the agglomeration of the waste rubber powder and forming a skeleton-filled composite system. At the same time, the glucosamine-functionalized nanoporous composite aerogel can promote the uniform dispersion of the waste cooking oil in the porous structure of the aerogel by reducing the oil-water interfacial tension, which is beneficial to the interfacial combination of the aerogel, waste rubber powder, and waste cooking oil. Among them, the waste cooking oil can be used as a wetting agent for the aerogel and waste rubber powder to improve their compatibility and dispersion in asphalt. Therefore, the aerogel-waste cooking oil-waste rubber powder ternary system enhances the high-temperature stability, low-temperature crack resistance, and water resistance of the recycled asphalt aggregate through the synergistic effect of multiple components, reduces the risks of rutting, cracking, and peeling, and improves the repair effect and durability of pavement cracks.

[0062] Example 4

[0063] This embodiment proposes a pavement crack regeneration grouting repair material, which includes the following components in parts by weight: 40 parts of glucosamine-functionalized nanoporous composite aerogel, 20 parts of waste cooking oil, 20 parts of waste rubber powder, and 100 parts of recycled asphalt aggregate.

[0064] The glucosamine-functionalized nanoporous composite aerogel includes the following components in parts by weight: 50 parts of graphene oxide, 30 parts of carboxylated carbon nanotubes, 6 parts of waterborne polyurethane, 60 parts of N-methyl-D-glucosamine, and 10 parts of sodium ascorbate.

[0065] Recycled asphalt aggregate is obtained by using a milling machine to strip the old asphalt pavement layer by layer, then using a jaw crusher to initially crush the large asphalt mixture to a particle size of ≤50 mm, and then finely pulverizing it through a cone crusher and vibrating screening to obtain a recycled material with a size of 3 mm.

[0066] A method for preparing a meglumine-functionalized nanoporous composite aerogel specifically includes the following steps:

[0067] (1) Add 3.0 g of graphite powder to 70 mL of concentrated sulfuric acid, cool it in an ice bath to 0 °C and slowly add 9.0 g of potassium permanganate, keep the temperature below 20 °C and stir for 3 h, then raise the temperature of the mixed solution to 40 °C and stir for 20 min, add 150 mL of deionized water and raise the temperature to 95 °C and stir for 10 min. After the heating ends, continue stirring. After cooling, add 500 mL of deionized water and 15 mL of a 30% hydrogen peroxide solution by mass fraction, and then centrifugally wash with a 4% hydrochloric acid solution by mass fraction until the pH of the supernatant is 7.0, and perform ultrasonic treatment for 10 min, and concentrate to obtain a graphene oxide dispersion. The content of the graphene oxide dispersion is 5 mg / mL, which is beneficial to forming a denser three-dimensional network structure and providing more cross-linking points of nanosheets. Among them, the two-dimensional sheet structure and high specific surface area of graphene oxide enable it to form a physical cross-linking network with asphalt molecules, effectively disperse stress, and reduce crack propagation. The high thermal conductivity and sheet barrier effect of graphene oxide can slow down the fluidity of asphalt at high temperatures and reduce rutting deformation. Graphene oxide can also enhance the low-temperature crack resistance by inhibiting the low-temperature embrittlement of asphalt, reducing the shrinkage stress. At the same time, the hydrophobicity and sheet barrier of graphene oxide can block water penetration, prevent water molecules from eroding the interface between asphalt and aggregates, and reduce the risk of cracks caused by water damage;

[0068] (2) Measure 100 mL of the graphene oxide dispersion described in step (1), ultrasonically treat it at room temperature for 1 h, pour it into a 200 mL polytetrafluoroethylene hydrothermal reaction kettle, add 0.3 g of carboxylated carbon nanotubes, and then add sodium ascorbate. The addition amount of sodium ascorbate is 0.10 g. Sodium ascorbate removes some of the oxygen-containing functional groups on the surface of graphene oxide, restoring the conjugated structure of graphene. This not only improves the thermal conductivity and hydrophobicity but also makes it easier to combine with carboxylated carbon nanotubes through π-π stacking or van der Waals forces. Then, add 60 mg of waterborne polyurethane and stir for 20 min to obtain a nanoporous composite aerogel dispersion. Sodium ascorbate promotes the cross-linking and binding of graphene oxide and carboxylated carbon nanotubes. Under the strong adhesion of waterborne polyurethane, a stable, uniform, and continuous three-dimensional porous network is formed, which can be used as a reinforcing skeleton for structural support. It not only effectively prevents the aggregation of graphene oxide and carboxylated carbon nanotubes but also improves the compressive strength and elastic modulus of asphalt, reducing the crack propagation caused by traffic loads on the road surface. The addition of graphene oxide and carboxylated carbon nanotubes can increase the softening point of asphalt, reduce the temperature sensitivity, and decrease the high-temperature rutting deformation. The high thermal conductivity of both can also promote the uniform distribution of heat from sunlight or external heat sources, accelerating the fluidity of asphalt and promoting crack self-healing. Waterborne polyurethane itself has good flexibility and can still maintain elasticity in a low-temperature environment, avoiding crack propagation caused by temperature shrinkage.

[0069] (3) Dissolve N-methyl-D-glucamine in 40 mL of water. The addition amount of N-methyl-D-glucamine is 0.6 g. The introduction of N-methyl-D-glucamine enhances the mechanical toughness of the aerogel, making it not easily fragmented under traffic loads and extending the service life of the repair material. It can also further optimize the weather resistance of the aerogel, enabling it to maintain stability in low-temperature or humid environments. Then add it to the nanoporous composite aerogel dispersion described in step (2), react at 90 °C for 6 h, cool to room temperature, take out the black hydrogel and immerse it in distilled water until the aqueous solution becomes colorless. Then, first pre-treat it by freezing in a -20 °C refrigerator for 12 h, and then freeze-dry it at -80 °C for 24 h to obtain N-methyl-D-glucamine-functionalized nanoporous composite aerogel. N-methyl-D-glucamine forms a more stable three-dimensional network through cross-linking with graphene oxide or waterborne polyurethane, enhancing the mechanical strength of the aerogel and preventing structural collapse after loading other components. The N-methyl-D-glucamine-functionalized nanoporous composite aerogel with its ultra-high porosity and nanoscale pore structure can penetrate deep into the cracks, fill the microvoids, and form a dense repair layer, reducing the risk of material detachment caused by water penetration. The porous structure of the aerogel also has a certain heat insulation effect, delaying the softening of asphalt at high temperatures and improving the rutting resistance. At the same time, the flexible structure of the composite aerogel can absorb some stress and relieve the crack formation caused by low-temperature shrinkage.

[0070] This embodiment provides a preparation method of a pavement crack regeneration grouting repair material, which specifically includes the following steps:

[0071] S1. Filter the dirt and suspended substances in the waste oil collected from restaurants to obtain waste cooking oil. Crush the waste rubber and collect waste rubber powder with a particle size of 70 μm. Among them, fatty acids and glycerides in the waste cooking oil can soften asphalt, improve its low-temperature crack resistance, reduce brittle cracking in winter, and the polar molecules of the oil can better combine with asphalt, enhancing the adhesion to the crack wall and preventing water penetration. The high elasticity of the waste rubber powder enables the asphalt to rebound after being compressed in the crack, adapt to crack deformation, reduce the risk of debonding, and can also form a network structure after mixing with asphalt, enhancing the bonding with the old pavement and preventing water intrusion. Moreover, the waste rubber powder can increase the viscosity of asphalt through physical crosslinking, improve the anti-deformation ability, and is beneficial to the high-temperature stability of the asphalt material.

[0072] S2. Place the recycled asphalt aggregate in an oven at 160 °C and heat it for 1 h, then take it out. Next, add the waste cooking oil and waste rubber powder described in step S1, mix for 10 min, then add glucosamine-functionalized nanoporous composite aerogel, and then use a high-speed shear machine to shear and mix at a temperature of 120 °C and a rate of 300 rpm for 30 min, and carry out the operation under nitrogen protection to obtain the pavement crack regeneration grouting repair material. The network structure of the glucosamine-functionalized nanoporous composite aerogel adsorbs and wraps the waste rubber powder, reducing the agglomeration of the waste rubber powder and forming a skeleton-fill composite system. At the same time, the glucosamine-functionalized nanoporous composite aerogel can promote the uniform dispersion of the waste cooking oil in the porous structure of the aerogel by reducing the oil-water interfacial tension, which is beneficial to the interfacial combination of the aerogel, waste rubber powder, and waste cooking oil. Among them, the waste cooking oil can be used as a wetting agent for the aerogel and waste rubber powder to improve their compatibility and dispersibility in asphalt. Therefore, the aerogel-waste cooking oil-waste rubber powder ternary system enhances the high-temperature stability, low-temperature crack resistance, and water resistance of the recycled asphalt aggregate through the synergistic effect of multiple components, reduces the risks of rutting, cracking, and peeling, and improves the repair effect and durability of pavement cracks.

[0073] Comparative Example 1

[0074] This comparative example provides a pavement crack regeneration grouting repair material, which is different from Example 1 in that the glucosamine-functionalized nanoporous composite aerogel does not contain graphene oxide; the preparation method of the glucosamine-functionalized nanoporous composite aerogel does not include step (1), and graphene oxide dispersion liquid is not added in step (2); the preparation method of the pavement crack regeneration grouting repair material is the same as that of Example 1.

[0075] Comparative Example 2

[0076] This comparative example provides a pavement crack regeneration grouting repair material, which is different from Example 1 in that the glucosamine-functionalized nanoporous composite aerogel does not contain waterborne polyurethane and sodium ascorbate; in step (2) of the preparation method of the glucosamine-functionalized nanoporous composite aerogel, waterborne polyurethane and sodium ascorbate are not added; the preparation method of the pavement crack regeneration grouting repair material is the same as that of Example 1.

[0077] Comparative Example 3

[0078] This comparative example provides a pavement crack regeneration grouting repair material, which is different from Example 1 in that the pavement crack regeneration grouting repair material does not contain N-methyl-D-glucosamine and waste cooking oil; in step (2) of the preparation method of the glucosamine-functionalized nanoporous composite aerogel, an aqueous solution of N-methyl-D-glucosamine is not added; in step S1 of the preparation method of the pavement crack regeneration grouting repair material, waste cooking oil is not contained, and waste cooking oil is not added in step S2 either.

[0079] Experimental Example 1

[0080] High-temperature stability experiment

[0081] Test samples: Sulfur battery cathode materials containing graphene oxide composites prepared in Examples 1-4 and Comparative Examples 1-3.

[0082] Test method: Select a 60°C rutting test to evaluate the ability of the test samples to resist permanent rutting deformation under high-temperature conditions. The specimen size is 300 mm × 300 mm × 50 mm, and the dynamic stability (times / mm) is obtained. The higher the value, the better the high-temperature stability and the stronger the rutting resistance ability.

[0083] Figure 2Graph of dynamic stability results for Examples 1-4 and Comparative Examples 1-3; as shown in the figure, the dynamic stability of Examples 1-4 is 7,841-8,527 times / mm, indicating strong high-temperature stability; the dynamic stability of Comparative Examples 1-3 is 5,160-6,785 times / mm, indicating weak high-temperature stability; the glucosamine-functionalized nanoporous composite aerogel of Comparative Example 1 does not contain graphene oxide, and cannot exert the high thermal conductivity and lamellar barrier effect of graphene oxide, nor is it conducive to the formation of a three-dimensional highly porous network structure, weakening the heat insulation effect and being not conducive to delaying the softening of asphalt at high temperature, resulting in weak high-temperature stability; the glucosamine-functionalized nanoporous composite aerogel of Comparative Example 2 does not contain waterborne polyurethane and sodium ascorbate, which is neither conducive to the cross-linking and binding of graphene oxide and carboxylated carbon nanotubes, nor can it exert the optimization of the network structure and bonding stability of waterborne polyurethane, and is not conducive to exerting the barrier performance and thermal conductivity, resulting in weak high-temperature stability; the pavement crack regeneration grouting repair material of Comparative Example 3 does not contain N-methyl-D-glucosamine and waste cooking oil, and cannot crosslink and modify the nanoporous composite aerogel, which is not conducive to improving the adsorption stability of waste rubber powder through interface modification and structural strengthening, nor is it conducive to the dispersion of aerogel and waste rubber powder in asphalt, and is not conducive to exerting the modification effect, resulting in weak high-temperature stability.

[0084] Experimental Example 2

[0085] Low-temperature anti-cracking experiment

[0086] Test samples: Sulfur battery cathode materials containing graphene oxide composites prepared in Examples 1-4 and Comparative Examples 1-3.

[0087] Test method: Select the low-temperature bending beam test to conduct the low-temperature anti-cracking test on the test samples. The specimen size is 250 mm × 30 mm × 35 mm. The loading method of the specimen is midpoint loading. The test temperature is -10°C, and the loading rate is 50 mm / min. The maximum flexural tensile strain (με) and flexural tensile strength (MPa) are obtained.

[0088] Figure 3Graph of low-temperature bending performance results for Examples 1-4 and Comparative Examples 1-3; as shown in the figure, the maximum flexural tensile strain and flexural tensile strength of Examples 1-4 are 5487-5658 με and 15.12-15.36 MPa, indicating good low-temperature crack resistance; the maximum flexural tensile strain and flexural tensile strength of Comparative Examples 1-3 are 3665-4489 με and 10.66-13.16 MPa, indicating poor low-temperature crack resistance; the meglumine-functionalized nanoporous composite aerogel of Comparative Example 1 does not contain graphene oxide and cannot play the role of graphene oxide in inhibiting the low-temperature embrittlement of asphalt. It is also not conducive to crosslinking to form a three-dimensional highly porous network structure, reducing the role of providing a skeleton support, weakening the compressive strength and elastic modulus of asphalt, resulting in poor low-temperature crack resistance; the meglumine-functionalized nanoporous composite aerogel of Comparative Example 2 does not contain waterborne polyurethane and sodium ascorbate, which is not conducive to promoting the crosslinking and binding of graphene oxide and carboxylated carbon nanotubes, weakening the porosity, adhesiveness and elasticity of the aerogel structure, and is not conducive to avoiding crack propagation caused by temperature shrinkage, resulting in poor low-temperature crack resistance; the pavement crack regeneration grouting repair material of Comparative Example 3 does not contain N-methyl-D-glucosamine and waste cooking oil, which is not conducive to optimizing the porosity, uniformity and stability of the aerogel structure, is not conducive to better absorbing part of the stress and alleviating the crack formation caused by low-temperature shrinkage, and is also not conducive to the dispersion and compatibility of the aerogel and waste rubber powder in asphalt, limiting the modification effect on asphalt, resulting in poor low-temperature crack resistance.

[0089] Experimental Example 3

[0090] Water resistance experiment

[0091] Test samples: Sulfur battery cathode materials containing graphene oxide composites prepared in Examples 1-4 and Comparative Examples 1-3.

[0092] Test method: Select the immersion and scattering test to test the water resistance of the test samples. The specimen is a Marshall specimen with a diameter of 101.6 mm ± 0.2 mm and a height of 63.5 mm ± 1.3 mm. The specimen is immersed in a constant temperature water bath at 60°C ± 0.5°C for 48 h, and then placed at room temperature for 24 h. The scattering loss rate (%) is measured by rotating and impacting with a Los Angeles abrasion testing machine.

[0093] Figure 4Graph of the scattering loss rate results for Examples 1-4 and Comparative Examples 1-3; as shown in the figure, the scattering loss rate of Examples 1-4 is 2.9-3.5%, indicating better water resistance; the scattering loss rate of Comparative Examples 1-3 is 4.9-7.5%, indicating poor water resistance; the glucosamine-functionalized nanoporous composite aerogel of Comparative Example 1 does not contain graphene oxide and cannot exert the hydrophobicity and lamellar barrier effect of graphene oxide, resulting in poor water resistance; the glucosamine-functionalized nanoporous composite aerogel of Comparative Example 2 does not contain waterborne polyurethane and sodium ascorbate, which is not conducive to crosslinking to form a stable, uniform, and continuous three-dimensional structure, reducing the moisture barrier performance and resulting in poor water resistance; the pavement crack regeneration grouting repair material of Comparative Example 3 does not contain N-methyl-D-glucosamine and waste cooking oil, which is not conducive to forming a dense repair layer through interface modification and structure optimization, increasing the infiltration of moisture, and unable to better synergistically disperse waste rubber powder uniformly in the asphalt material to play a modification role, resulting in poor water resistance.

[0094] The above experimental results show that the high-temperature stability, low-temperature crack resistance, and water resistance of Examples 1-4 of the present invention are significantly better than those of the samples of Comparative Examples 1-3. Among them, Example 1 using glucosamine-functionalized nanoporous composite aerogel, waste cooking oil, and waste rubber powder has stronger high-temperature stability, better low-temperature crack resistance, and better water resistance. The glucosamine-functionalized nanoporous composite aerogel is loaded with waste cooking oil and waste rubber powder to form a three-system composite with excellent interfacial bonding. Through the synergistic effect of the porous structure of the aerogel and the filler, the recycled asphalt aggregate is modified, significantly improving the high-temperature stability, low-temperature crack resistance, and water resistance of the asphalt material, effectively reducing the occurrence of rutting, cracking, and peeling, and being beneficial to improving the effectiveness and durability of pavement crack repair.

[0095] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

[0096] The above describes the present invention and its embodiments, and this description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual application is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design similar ways and embodiments without creative efforts without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A pavement crack regeneration grouting repair material, characterized in that: The pavement crack regeneration grouting repair material comprises the following components in parts by weight: 40-60 parts of glucosamine-functionalized nanoporous composite aerogel, 10-20 parts of waste cooking oil, 10-20 parts of waste rubber powder, and 80-100 parts of recycled asphalt aggregate; the glucosamine-functionalized nanoporous composite aerogel comprises the following components in parts by weight: 40-50 parts of graphene oxide, 10-30 parts of carboxylated carbon nanotubes, 6-10 parts of waterborne polyurethane, 60-80 parts of N-methyl-D-glucosamine, and 10-14 parts of sodium ascorbate; the recycled asphalt aggregate is obtained by using a milling machine to strip the old asphalt pavement layer by layer, then using a jaw crusher to primarily crush the large asphalt mixture to a particle size of ≤50 mm, and then performing fine crushing through a cone crusher and vibrating screen to obtain a 1-3 mm recycled material.

2. A preparation method of the pavement crack regeneration grouting repair material according to claim 1, characterized in that: Specifically, it includes the following steps: S1. Filter the dirt and suspended matter in the waste oil collected from restaurants to obtain waste cooking oil, crush the waste rubber, and collect waste rubber powder with a particle size of 50-70 μm. S2. Place the recycled asphalt aggregate in an oven at 150-160 °C and heat for 1-2 h, take it out, then add the waste cooking oil and waste rubber powder described in step S1, mix for 10-30 min, then add the glucosamine-functionalized nanoporous composite aerogel, and then use a high-speed shearer to shear and mix at a temperature of 100-120 °C at a rate of 300 rpm for 30-60 min, and perform the operation under nitrogen protection to obtain the pavement crack regeneration grouting repair material.

3. The preparation method of the pavement crack regeneration grouting repair material according to claim 2, characterized in that: The preparation method of the glucosamine-functionalized nanoporous composite aerogel specifically includes the following steps: (1) Add 2.0-3.0 g of graphite powder to 70 mL of concentrated sulfuric acid, cool it in an ice bath to 0 °C and slowly add 9.0 g of potassium permanganate, keep the temperature below 20 °C and stir for 3-4 h, then raise the temperature of the mixed solution to 35-40 °C and stir for 20-30 min, add 150 mL of deionized water and raise the temperature to 95 °C and stir for 10-15 min, continue to stir after heating is completed, cool, add 500 mL of deionized water and 15 mL of 30% hydrogen peroxide solution by mass fraction, and then centrifuge and wash with a 4% hydrochloric acid solution by mass fraction until the pH of the supernatant is 7.0, and perform ultrasonic treatment for 10-20 min, and concentrate to obtain a graphene oxide dispersion. (2) Measure 100 mL of the graphene oxide dispersion described in step (1), perform ultrasonic treatment at room temperature for 1-2 h, pour it into a 200 mL polytetrafluoroethylene hydrothermal reaction kettle, add 0.1-0.3 g of carboxylated carbon nanotubes, then add sodium ascorbate, and then dropwise add 60-100 mg of waterborne polyurethane, and stir for 20-30 min to obtain a nanoporous composite aerogel dispersion. (3) Dissolve N-methyl-D-glucosamine in 40 mL of water, and then add it to the nano-porous composite aerogel dispersion described in step (2). React at 80 - 90 °C for 6 - 8 h, cool to room temperature, take out the black hydrogel and immerse it in distilled water until the aqueous solution becomes colorless. Then, first place it in a -20 °C refrigerator for 12 h for pretreatment, and then freeze-dry it at -80 °C for 24 - 48 h to obtain N-methyl-D-glucosamine-functionalized nano-porous composite aerogel.

4. The preparation method of the pavement crack regeneration grouting repair material according to claim 3, characterized in that: In step (1), the content of the graphene oxide dispersion is 4 - 5 mg / mL.

5. The preparation method of the pavement crack regeneration grouting repair material according to claim 4, characterized in that: In step (2), the addition amount of sodium ascorbate is 0.10 - 0.14 g.

6. The preparation method of the pavement crack regeneration grouting repair material according to claim 5, characterized in that: In step (3), the addition amount of N-methyl-D-glucosamine is 0.6 - 0.8 g.

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