A road 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, relating to the technical field of pavement materials; the pavement crack regeneration grouting repair material comprises meglumine-functionalized nanoporous composite aerogel, waste cooking oil, waste rubber powder and regenerated asphalt aggregate; the meglumine-functionalized nanoporous composite aerogel is loaded with waste cooking oil and waste rubber powder to form a three-system composite with excellent interface bonding; the regenerated asphalt aggregate is modified 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 facilitating improving the effectiveness and durability of pavement crack repair.

Description

Technical Field

[0001] The present invention belongs to the technical field of pavement materials, and in particular relates 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, and short paving cycle. However, due to the continuous increase in traffic volume and the influence of extreme climate, road damage and aging problems are becoming increasingly prominent. Therefore, the development of suitable and effective repair materials is an important part of asphalt pavement crack repair technology.

[0003] Asphalt is used as a pavement crack repair material in road repair, which can play an excellent repair role, significantly improve the durability of the road, and realize fast road traffic. Among them, asphalt is hydrophobic and can effectively seal cracks, prevent rainwater, snow water, etc. from penetrating into the pavement structure layer, avoid softening of the base layer and soil subgrade, and extend the service life of the road. Asphalt grouting materials can firmly bond the asphalt mixture on both sides of the crack and restore the integrity of the road surface. The heated asphalt or emulsified asphalt can be easily poured into narrow cracks and fill them densely.

[0004] The existing technology currently has the following problems:

[0005] Traditional asphalt materials tend to soften under high temperature conditions, resulting in decreased material strength, flow deformation or bonding failure. At low temperatures, they become brittle and crack, which in turn limits the durability of the repair material. Summary of the Invention

[0006] In view of the above situation, in order to overcome the defects of the prior art, the present invention proposes a pavement crack regeneration grouting repair material, comprising the following components by weight: 40-60 parts of meglumine 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 meglumine-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-glucamine, and 10-14 parts of sodium ascorbate.

[0008] The recycled asphalt aggregate is prepared by using a milling machine to peel off the old asphalt pavement in layers, and then using a jaw crusher to crush the large asphalt mixture to a particle size of ≤50mm, and then finely crushing it through a cone crusher and vibrating screening to obtain recycled materials of 1-3mm.

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

[0010] (1) Add 2.0-3.0g of graphite powder to 70mL of concentrated sulfuric acid, cool to 0℃ in an ice bath and slowly add 9.0g of potassium permanganate, keep the temperature below 20℃ and stir for 3-4h, then raise the temperature of the mixed solution to 35-40℃ and stir for 20-30min, add 150mL of deionized water and heat to 95℃ and stir for 10-15min, continue stirring after heating, cool, add 500mL of deionized water and 15mL of 30% hydrogen peroxide solution, then centrifuge and wash with 4% hydrochloric acid solution until the supernatant pH is 7.0, and ultrasonically treat. 10-20 minutes, concentrated to obtain a graphene oxide dispersion, wherein the two-dimensional sheet structure and high specific surface area of graphene oxide enable it to form a physical cross-linked network with asphalt molecules, effectively dispersing stress and reducing 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 inhibit the low-temperature embrittlement of asphalt, reduce shrinkage stress, and enhance low-temperature crack resistance. 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 risk of cracks caused by water damage;

[0011] (2) 100 mL of the graphene oxide dispersion described in step (1) was measured and ultrasonically treated at room temperature for 1-2 h, and then poured into a 200 mL polytetrafluoroethylene hydrothermal reactor. 0.1-0.3 g of carboxylated carbon nanotubes was added, followed by sodium ascorbate, and then 60-100 mg of aqueous polyurethane was added dropwise. The mixture was stirred for 20-30 min to obtain a nanoporous composite aerogel dispersion. Sodium ascorbate promoted the cross-linking of graphene oxide and carboxylated carbon nanotubes. Under the strong bonding of aqueous polyurethane, a stable, uniform and continuous three-dimensional porous network was 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 expansion of cracks caused by load on the road surface. The addition of graphene oxide and carboxylated carbon nanotubes can increase the softening point of asphalt, reduce temperature sensitivity, and reduce 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 self-healing of cracks. Waterborne polyurethane itself has good flexibility and can remain elastic in low-temperature environments, avoiding crack expansion caused by temperature contraction.

[0012] (3) N-methyl-D-glucosamine was dissolved in 40 mL of water, and then added to the nanoporous composite aerogel dispersion described in step (2), and reacted at 80-90 ° C for 6-8 hours, cooled to room temperature, and the black hydrogel was taken out and immersed in distilled water until the aqueous solution became colorless, and then placed in a -20 ° C refrigerator for 12 hours for pretreatment, and then freeze-dried at -80 ° C for 24-48 hours to obtain the meglumine functionalized nanoporous composite aerogel. N-methyl-D-glucosamine was cross-linked with graphene oxide or waterborne polyurethane to form A more stable three-dimensional network enhances the mechanical strength of the aerogel and prevents structural collapse after loading other components. The ultra-high porosity and nanoscale pore structure of the meglumine-functionalized nanoporous composite aerogel can penetrate deep into cracks, fill tiny gaps, 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 thermal insulation effect, delaying the softening of asphalt at high temperatures and improving rutting resistance. At the same time, the flexible structure of the composite aerogel can absorb some stress and alleviate the formation of cracks caused by low-temperature shrinkage.

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

[0014] Preferably, in step (2), the amount of sodium ascorbate added is 0.10-0.14 g. Sodium ascorbate partially removes the oxygen-containing functional groups on the surface of graphene oxide, restoring the conjugated structure of graphene, which 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 amount of N-methyl-D-glucamine added is 0.6-0.8 g. The introduction of N-methyl-D-glucamine enhances the mechanical toughness of the aerogel, making it less likely to break under traffic loads, thereby 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 method for preparing a pavement crack regeneration grouting repair material, which specifically comprises the following steps:

[0017] S1. Waste oil collected from restaurants is filtered to remove dirt and suspended matter to obtain waste cooking oil. Waste rubber is crushed and collected to obtain waste rubber powder with a particle size of 50-70 μm. The fatty acids and glycerides in the waste cooking oil can soften asphalt, improve its low-temperature crack resistance, and reduce brittle cracking in winter. The polar molecules of oil and fat can better combine with asphalt, enhancing adhesion to the crack wall and preventing moisture penetration. The high elasticity of the waste rubber powder enables the asphalt to rebound after being compressed in the crack, adapting to crack deformation and reducing the risk of debonding. It can also form a network structure after mixing with asphalt, strengthening adhesion to the old road surface and preventing moisture intrusion. In addition, the waste rubber powder can increase the viscosity of asphalt through physical cross-linking, improving its deformation resistance and promoting the high-temperature stability of the asphalt material.

[0018] S2, placing the recycled asphalt aggregate in an oven at 150-160 ° C for 1-2 hours, taking it out, then adding the waste cooking oil and waste rubber powder described in step S1, mixing for 10-30 minutes, and then adding the meglumine functionalized nanoporous composite aerogel, and then using a high-speed shearing machine at a temperature of 100-120 ° C and a speed of 300 rpm for 30-60 minutes, and under nitrogen protection, to obtain a road crack regeneration grouting repair material. The network structure of the meglumine functionalized nanoporous composite aerogel adsorbs and wraps the waste rubber powder, reducing the agglomeration of the waste rubber powder, forming a skeleton-filling composite. system. At the same time, the meglumine functionalized nanoporous composite aerogel can promote 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 aerogel, waste rubber powder and waste cooking oil. Among them, waste cooking oil can be used as a wetting agent for 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 falling off, 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 onto meglumine-functionalized nanoporous composite aerogel. Through the synergistic effect of the porous structure of the aerogel and the filler, the recycled asphalt aggregate is modified, which significantly improves the high-temperature stability, low-temperature crack resistance and water resistance of the asphalt material, effectively reduces the occurrence of rutting, cracking and shedding, and is conducive 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. 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, 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 still 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 performance and thermal conductivity, and reducing the adverse effects of high temperature and moisture. Then, N-methyl-D-glucamine 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 meglumine functionalized nanoporous composite aerogel relies on its ultra-high porosity and nanoscale pore structure to 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 thermal 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 aerogel's load stability 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 absorbs and encapsulates waste rubber powder, reducing its agglomeration, but also improves the uniform dispersion of waste cooking oil within the porous structure of the aerogel by reducing the oil-water interfacial tension, thus facilitating the interfacial bonding of the aerogel, waste rubber powder, and waste cooking oil. The waste cooking oil also serves as a wetting agent for the aerogel and waste rubber powder, enhancing their compatibility and dispersibility in asphalt. Thus, the aerogel-waste cooking oil-waste rubber powder ternary system maximizes the use of aerogel and filler through the synergistic effect between the components, 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 risk of rutting, cracking, and shedding. The present invention utilizes the meglumine-functionalized nanoporous composite aerogel, waste cooking oil, waste rubber powder, and recycled asphalt aggregate to produce a pavement crack regeneration grouting repair material with improved high-temperature stability, low-temperature crack resistance, and water resistance, effectively reducing the occurrence of rutting, cracking, and shedding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a scanning electron microscope image of the pavement crack regeneration grouting repair material prepared in Example 1 of the present invention;

[0022] Figure 2 The figure is a graph showing the dynamic stability results of Examples 1-4 and Comparative Examples 1-3 of the present invention;

[0023] Figure 3 The low-temperature bending performance results of Examples 1-4 and Comparative Examples 1-3 of the present invention are shown in FIG.

[0024] Figure 4 This is a graph showing the scattering loss rate results of Examples 1-4 of the present invention and Comparative Examples 1-3. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those familiar to those skilled in the art. Furthermore, any methods and materials similar or equivalent to those described herein can be applied to the present invention. The preferred embodiments and materials described herein are for illustrative purposes only and are not intended to limit the scope of this application.

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

[0028] Example 1

[0029] This embodiment provides a pavement crack regeneration grouting repair material, comprising the following components in parts by weight: 60 parts of meglumine-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 meglumine-functionalized nanoporous composite aerogel comprises 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-glucamine, and 14 parts of sodium ascorbate.

[0031] Recycled asphalt aggregate is made by using a milling machine to peel off the old asphalt pavement in layers, and then using a jaw crusher to crush the large asphalt mixture to a particle size of ≤50mm. It is then finely crushed through a cone crusher and vibrating screening to obtain 3mm recycled material.

[0032] The preparation method of meglumine functionalized nanoporous composite aerogel specifically comprises the following steps:

[0033] (1) Add 3.0 g of graphite powder to 70 mL of concentrated sulfuric acid, cool to 0 °C in an ice bath 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 heat to 95 °C and stir for 15 min, continue stirring after heating, cool, add 500 mL of deionized water and 15 mL of 30% hydrogen peroxide solution, then centrifuge and wash with 4% hydrochloric acid solution until the supernatant has a pH of 7.0, ultrasonicate for 20 min, and concentrate to obtain a graphene oxide dispersion. A dosage of 5 mg / mL is conducive to forming a denser three-dimensional network structure and providing more nanosheet cross-linking points. 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 dispersing stress and reducing crack propagation. The high thermal conductivity and sheet barrier effect of graphene oxide can slow the fluidity of asphalt at high temperatures and reduce rutting deformation. Graphene oxide can also inhibit the low-temperature embrittlement of asphalt, reduce shrinkage stress, and enhance low-temperature crack resistance. 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 risk of cracks caused by water damage.

[0034] (2) 100 mL of the graphene oxide dispersion described in step (1) was measured and ultrasonically treated at room temperature for 2 h. The dispersion was poured into a 200 mL polytetrafluoroethylene hydrothermal reactor. 0.3 g of carboxylated carbon nanotubes was added, followed by sodium ascorbate, where the amount of sodium ascorbate added was 0.14 g. Sodium ascorbate partially removed the oxygen-containing functional groups on the surface of graphene oxide and restored the conjugated structure of graphene, which not only improved the thermal conductivity and hydrophobicity but also made it easier to combine with carboxylated carbon nanotubes through π-π stacking or van der Waals force. 100 mg of aqueous polyurethane was then added dropwise and stirred for 30 min to obtain a nanoporous composite aerogel dispersion. Sodium ascorbate promoted the crosslinking of graphene oxide and carboxylated carbon nanotubes. Combined with the super 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 expansion of cracks caused by load on the road surface. The addition of graphene oxide and carboxylated carbon nanotubes can increase the softening point of asphalt, reduce temperature sensitivity, and reduce 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 self-healing of cracks. Waterborne polyurethane itself has good flexibility and can remain elastic in low-temperature environments, avoiding the expansion of cracks caused by temperature contraction.

[0035] (3) N-methyl-D-glucamine was dissolved in 40 mL of water. The amount of N-methyl-D-glucamine added was 0.8 g. The introduction of N-methyl-D-glucamine enhanced the mechanical toughness of the aerogel, making it less likely 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 could still maintain stability in low temperature or humid environments. The aerogel was then added to the nanoporous composite aerogel dispersion described in step (2), reacted at 90 ° C for 8 h, cooled to room temperature, and the black hydrogel was taken out and immersed in distilled water until the aqueous solution became colorless. The aerogel was then placed in a -20 ° C refrigerator for 12 h for pretreatment, and then freeze-dried at -80 ° C for 48 h to obtain the obtained aerogel. As for the meglumine-functionalized nanoporous composite aerogel, N-methyl-D-glucosamine forms a more stable three-dimensional network by cross-linking with graphene oxide or water-based polyurethane, enhancing the mechanical strength of the aerogel and preventing structural collapse after loading other components. The meglumine-functionalized nanoporous composite aerogel has an ultra-high porosity and nanoscale pore structure, which 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. The porous structure of the aerogel has a certain thermal insulation effect, which delays the softening of asphalt at high temperature and improves the rutting resistance. At the same time, the flexible structure of the composite aerogel can absorb part of the stress and alleviate the formation of cracks caused by low-temperature shrinkage.

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

[0037] S1. Waste oil collected from restaurants is filtered to remove dirt and suspended matter to obtain waste cooking oil. Waste rubber is crushed and collected with a particle size of 70 μm to obtain waste rubber powder. The fatty acids and glycerides in the waste cooking oil can soften asphalt, improve its low-temperature crack resistance, and reduce brittle cracking in winter. The polar molecules of oil and fat can better combine with asphalt, enhancing adhesion to the crack wall and preventing moisture penetration. The high elasticity of the waste rubber powder enables the asphalt to rebound after being compressed in the crack, adapting to crack deformation and reducing the risk of debonding. It can also form a network structure after mixing with asphalt, strengthening adhesion to the old road surface and preventing moisture intrusion. In addition, the waste rubber powder can increase the viscosity of asphalt through physical cross-linking, improving its deformation resistance and promoting the high-temperature stability of the asphalt material.

[0038] S2, placing the regenerated asphalt aggregate in a 160 ° C oven and heating it for 2 hours, taking it out, then adding the waste cooking oil and waste rubber powder described in step S1, mixing for 30 minutes, and then adding the meglumine functionalized nanoporous composite aerogel, and then using a high-speed shearing machine to shear and mix at a rate of 300 rpm for 60 minutes at a temperature of 120 ° C, and under nitrogen protection, to obtain a road crack regeneration grouting repair material. The network structure of the meglumine functionalized nanoporous composite aerogel adsorbs and wraps the waste rubber powder, reducing the agglomeration of the waste rubber powder, forming a skeleton-filling composite system, and at the same time, the meglumine functionalized nanoporous composite aerogel Amine-functionalized nanoporous composite aerogel can promote the uniform dispersion of waste cooking oil in the porous structure of aerogel by reducing the oil-water interfacial tension, which is beneficial to the interfacial bonding of aerogel, waste rubber powder and waste cooking oil. Among them, waste cooking oil can serve as a wetting agent for aerogel and waste rubber powder, improving 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 recycled asphalt aggregate through the synergistic effect of multiple components, reduces the risk of rutting, cracking and falling off, and improves the repair effect and durability of pavement cracks.

[0039] In this example, the prepared pavement crack regeneration grouting repair material was subjected to scanning electron microscopy to observe its microscopic morphology. Figure 1 This is a 1000-fold magnified SEM image of the pavement crack regeneration grouting repair material prepared in Example 1. As shown in the figure, the pavement crack regeneration grouting repair material prepared in this example exhibits good dispersion compatibility.

[0040] Example 2

[0041] This embodiment provides a pavement crack regeneration grouting repair material, comprising the following components in parts by weight: 40 parts of meglumine-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 meglumine-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-glucamine, and 10 parts of sodium ascorbate.

[0043] Recycled asphalt aggregate is made by using a milling machine to peel off the old asphalt pavement in layers, and then using a jaw crusher to crush the large asphalt mixture to a particle size of ≤50mm. It is then finely crushed through a cone crusher and vibrating screening to obtain 1mm recycled material.

[0044] The preparation method of meglumine 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 to 0 °C in an ice bath, 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 heat to 95 °C and stir for 10 min. Continue stirring after heating. After cooling, add 500 mL of deionized water and 15 mL of 30% hydrogen peroxide solution. Then, centrifuge and wash with 4% hydrochloric acid solution until the supernatant has a pH of 7.0. Ultrasonic treatment is performed for 10 min and concentrated to obtain a graphene oxide dispersion. The graphene oxide dispersion contains The addition of 4 mg / mL of graphene oxide is conducive to the formation of a denser three-dimensional network structure and provides more nanosheet cross-linking points. 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 dispersing stress and reducing crack propagation. The high thermal conductivity and sheet barrier effect of graphene oxide can slow the fluidity of asphalt at high temperatures and reduce rutting deformation. Graphene oxide can also inhibit the low-temperature embrittlement of asphalt, reduce shrinkage stress, and enhance low-temperature crack resistance. 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 risk of cracks caused by water damage.

[0046] (2) 100 mL of the graphene oxide dispersion described in step (1) was measured and ultrasonically treated at room temperature for 1 h, and then poured into a 200 mL polytetrafluoroethylene hydrothermal reactor. 0.1 g of carboxylated carbon nanotubes was added, and then sodium ascorbate was added. The amount of sodium ascorbate added was 0.10 g. Sodium ascorbate partially removed the oxygen-containing functional groups on the surface of graphene oxide and restored the conjugated structure of graphene, which not only improved the thermal conductivity and hydrophobicity, but also made it easier to combine with carboxylated carbon nanotubes through π-π stacking or van der Waals force. Then 60 mg of aqueous polyurethane was added dropwise and stirred for 20 min to obtain a nanoporous composite aerogel dispersion. Sodium ascorbate promoted the cross-linking of graphene oxide and carboxylated carbon nanotubes. The combination of graphene oxide and carboxylated carbon nanotubes forms a stable, uniform and continuous three-dimensional porous network under the super strong bonding of water-based polyurethane, 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 expansion of cracks caused by load on the road surface. The addition of graphene oxide and carboxylated carbon nanotubes can increase the softening point of asphalt, reduce temperature sensitivity, and reduce 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 self-healing of cracks. Water-based polyurethane itself has good flexibility and can remain elastic in low-temperature environments, avoiding crack expansion caused by temperature contraction.

[0047] (3) N-methyl-D-glucamine was dissolved in 40 mL of water. The amount of N-methyl-D-glucamine added was 0.6 g. The introduction of N-methyl-D-glucamine enhanced the mechanical toughness of the aerogel, making it less likely 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 could still maintain stability in low temperature or humid environments. The aerogel was then added to the nanoporous composite aerogel dispersion described in step (2), reacted at 80 ° C for 6 h, cooled to room temperature, and the black hydrogel was taken out and immersed in distilled water until the aqueous solution became colorless. The aerogel was then placed in a -20 ° C refrigerator for 12 h for pretreatment, and then freeze-dried at -80 ° C for 24 h to obtain the obtained aerogel. As for the meglumine-functionalized nanoporous composite aerogel, N-methyl-D-glucosamine forms a more stable three-dimensional network by cross-linking with graphene oxide or water-based polyurethane, enhancing the mechanical strength of the aerogel and preventing structural collapse after loading other components. The meglumine-functionalized nanoporous composite aerogel has an ultra-high porosity and nanoscale pore structure, which 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. The porous structure of the aerogel has a certain thermal insulation effect, which delays the softening of asphalt at high temperature and improves the rutting resistance. At the same time, the flexible structure of the composite aerogel can absorb part of the stress and alleviate the formation of cracks caused by low-temperature shrinkage.

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

[0049] S1. Waste oil collected from restaurants is filtered to remove dirt and suspended matter to obtain waste cooking oil. Waste rubber is crushed and collected with a particle size of 50 μm to obtain waste rubber powder. The fatty acids and glycerides in the waste cooking oil can soften asphalt, improve its low-temperature crack resistance, and reduce brittle cracking in winter. The polar molecules of oil and fat can better combine with asphalt, enhancing adhesion to the crack wall and preventing moisture penetration. The high elasticity of the waste rubber powder enables the asphalt to rebound after being compressed in the crack, adapting to crack deformation and reducing the risk of debonding. It can also form a network structure after mixing with asphalt, strengthening adhesion to the old road surface and preventing moisture intrusion. In addition, the waste rubber powder can increase the viscosity of asphalt through physical cross-linking, improving its deformation resistance and promoting the high-temperature stability of the asphalt material.

[0050] S2, the recycled asphalt aggregate is placed in a 150 ° C oven and heated for 1 hour, taken out, and then the waste cooking oil and waste rubber powder described in step S1 are added, mixed for 10 minutes, and then the meglumine functionalized nanoporous composite aerogel is added, and then a high-speed shearing machine is used to shear and mix at a rate of 300 rpm for 30 minutes at a temperature of 100 ° C, and the process is carried out under nitrogen protection to obtain a road crack regeneration grouting repair material. The network structure of the meglumine functionalized nanoporous composite aerogel adsorbs and wraps the waste rubber powder, reduces the agglomeration of the waste rubber powder, and forms a skeleton-filling composite system. At the same time, the meglumine functionalized nanoporous composite aerogel Amine-functionalized nanoporous composite aerogel can promote the uniform dispersion of waste cooking oil in the porous structure of aerogel by reducing the oil-water interfacial tension, which is beneficial to the interfacial bonding of aerogel, waste rubber powder and waste cooking oil. Among them, waste cooking oil can serve as a wetting agent for aerogel and waste rubber powder, improving 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 recycled asphalt aggregate through the synergistic effect of multiple components, reduces the risk of rutting, cracking and falling off, and improves the repair effect and durability of pavement cracks.

[0051] Example 3

[0052] This embodiment provides a pavement crack regeneration grouting repair material, comprising the following components in parts by weight: 50 parts of meglumine-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 meglumine-functionalized nanoporous composite aerogel comprises 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-glucamine, and 12 parts of sodium ascorbate.

[0054] Recycled asphalt aggregate is made by using a milling machine to peel off the old asphalt pavement in layers, and then using a jaw crusher to crush the large asphalt mixture to a particle size of ≤50mm. It is then finely crushed through a cone crusher and vibrating screening to obtain 2mm recycled material.

[0055] The preparation method of meglumine functionalized nanoporous composite aerogel specifically comprises the following steps:

[0056] (1) Add 2.5 g of graphite powder to 70 mL of concentrated sulfuric acid, cool to 0 ° C in an ice bath 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 heat to 95 ° C and stir for 12.5 min, continue stirring after heating, cool, add 500 mL of deionized water and 15 mL of 30% hydrogen peroxide solution, then centrifuge and wash with 4% hydrochloric acid solution until the supernatant pH is 7.0, ultrasonicate for 15 min, concentrate, and obtain graphene oxide dispersion. The content of 4.5 mg / mL is conducive to the formation of a denser three-dimensional network structure and provides more nanosheet cross-linking points. 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 dispersing stress and reducing crack expansion. 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 inhibit the low-temperature embrittlement of asphalt, reduce shrinkage stress, and enhance low-temperature crack resistance. 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 risk of cracks caused by water damage.

[0057] (2) 100 mL of the graphene oxide dispersion described in step (1) was measured and ultrasonically treated at room temperature for 1.5 h. The dispersion was poured into a 200 mL polytetrafluoroethylene hydrothermal reactor, 0.2 g of carboxylated carbon nanotubes was added, and then sodium ascorbate was added. The amount of sodium ascorbate added was 0.12 g. Sodium ascorbate partially removed the oxygen-containing functional groups on the surface of graphene oxide and restored the conjugated structure of graphene, which not only improved the thermal conductivity and hydrophobicity, but also made it easier to combine with carboxylated carbon nanotubes through π-π stacking or van der Waals force. Then 80 mg of aqueous polyurethane was added dropwise and stirred for 25 min to obtain a nanoporous composite aerogel dispersion. Sodium ascorbate promoted the crosslinking of graphene oxide and carboxylated carbon nanotubes. Combined with the super 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 expansion of cracks caused by load on the road surface. The addition of graphene oxide and carboxylated carbon nanotubes can increase the softening point of asphalt, reduce temperature sensitivity, and reduce 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 self-healing of cracks. Waterborne polyurethane itself has good flexibility and can remain elastic in low-temperature environments, avoiding the expansion of cracks caused by temperature contraction.

[0058] (3) N-methyl-D-glucamine was dissolved in 40 mL of water. The amount of N-methyl-D-glucamine added was 0.7 g. The introduction of N-methyl-D-glucamine enhanced the mechanical toughness of the aerogel, making it less likely 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 could still maintain stability in low temperature or humid environments. The aerogel was then added to the nanoporous composite aerogel dispersion described in step (2), reacted at 85 ° C for 7 h, cooled to room temperature, and the black hydrogel was taken out and immersed in distilled water until the aqueous solution became colorless. The aerogel was then placed in a -20 ° C refrigerator for 12 h for pretreatment, and then freeze-dried at -80 ° C for 36 h to obtain the obtained aerogel. As for the meglumine-functionalized nanoporous composite aerogel, N-methyl-D-glucosamine forms a more stable three-dimensional network by cross-linking with graphene oxide or water-based polyurethane, enhancing the mechanical strength of the aerogel and preventing structural collapse after loading other components. The meglumine-functionalized nanoporous composite aerogel has an ultra-high porosity and nanoscale pore structure, which 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. The porous structure of the aerogel has a certain thermal insulation effect, which delays the softening of asphalt at high temperature and improves the rutting resistance. At the same time, the flexible structure of the composite aerogel can absorb part of the stress and alleviate the formation of cracks caused by low-temperature shrinkage.

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

[0060] S1. Waste oil collected from restaurants is filtered to remove dirt and suspended matter to obtain waste cooking oil. Waste rubber is crushed and collected with a particle size of 60 μm to obtain waste rubber powder. The fatty acids and glycerides in the waste cooking oil can soften asphalt, improve its low-temperature crack resistance, and reduce brittle cracking in winter. The polar molecules of oil and fat can better combine with asphalt, enhancing adhesion to the crack wall and preventing moisture penetration. The high elasticity of the waste rubber powder enables the asphalt to rebound after being compressed in the crack, adapting to crack deformation and reducing the risk of debonding. It can also form a network structure after mixing with asphalt, strengthening adhesion to the old road surface and preventing moisture intrusion. In addition, the waste rubber powder can increase the viscosity of asphalt through physical cross-linking, improving its deformation resistance and promoting the high-temperature stability of the asphalt material.

[0061] S2, the recycled asphalt aggregate is placed in a 155 ° C oven and heated for 1.5 hours, taken out, and then the waste cooking oil and waste rubber powder described in step S1 are added, mixed for 20 minutes, and then the meglumine functionalized nanoporous composite aerogel is added, and then a high-speed shearing machine is used to shear and mix at a rate of 300 rpm for 45 minutes at a temperature of 110 ° C, and the process is carried out under nitrogen protection to obtain a road crack regeneration grouting repair material. The network structure of the meglumine functionalized nanoporous composite aerogel adsorbs and wraps the waste rubber powder, reducing the agglomeration of the waste rubber powder and forming a skeleton-filling composite system. At the same time, the meglumine functionalized nanoporous composite aerogel Methylamine-functionalized nanoporous composite aerogel can promote the uniform dispersion of waste cooking oil in the porous structure of aerogel by reducing the oil-water interfacial tension, which is beneficial to the interfacial bonding of aerogel, waste rubber powder and waste cooking oil. Among them, waste cooking oil can be used as a wetting agent for 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 recycled asphalt aggregate through the synergistic effect of multiple components, reduces the risk of rutting, cracking and falling off, and improves the repair effect and durability of road cracks.

[0062] Example 4

[0063] This embodiment provides a pavement crack regeneration grouting repair material, comprising the following components in parts by weight: 40 parts of meglumine-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 meglumine-functionalized nanoporous composite aerogel comprises 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-glucamine, and 10 parts of sodium ascorbate.

[0065] Recycled asphalt aggregate is made by using a milling machine to peel off the old asphalt pavement in layers, and then using a jaw crusher to crush the large asphalt mixture to a particle size of ≤50mm. It is then finely crushed through a cone crusher and vibrating screening to obtain 3mm recycled material.

[0066] The preparation method of meglumine functionalized nanoporous composite aerogel specifically comprises the following steps:

[0067] (1) Add 3.0 g of graphite powder to 70 mL of concentrated sulfuric acid, cool to 0 °C in an ice bath 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 heat to 95 °C and stir for 10 min, continue stirring after heating, cool, add 500 mL of deionized water and 15 mL of 30% hydrogen peroxide solution, then centrifuge and wash with 4% hydrochloric acid solution until the supernatant has a pH of 7.0, ultrasonicate for 10 min, and concentrate to obtain a graphene oxide dispersion. A dosage of 5 mg / mL is conducive to forming a denser three-dimensional network structure and providing more nanosheet cross-linking points. 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 dispersing stress and reducing crack propagation. The high thermal conductivity and sheet barrier effect of graphene oxide can slow the fluidity of asphalt at high temperatures and reduce rutting deformation. Graphene oxide can also inhibit the low-temperature embrittlement of asphalt, reduce shrinkage stress, and enhance low-temperature crack resistance. 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 risk of cracks caused by water damage.

[0068] (2) 100 mL of the graphene oxide dispersion described in step (1) was measured and ultrasonically treated at room temperature for 1 h, and then poured into a 200 mL polytetrafluoroethylene hydrothermal reactor. 0.3 g of carboxylated carbon nanotubes was added, and then sodium ascorbate was added. The amount of sodium ascorbate added was 0.10 g. Sodium ascorbate partially removed the oxygen-containing functional groups on the surface of graphene oxide and restored the conjugated structure of graphene, which not only improved the thermal conductivity and hydrophobicity, but also made it easier to combine with carboxylated carbon nanotubes through π-π stacking or van der Waals force. Then 60 mg of aqueous polyurethane was added dropwise and stirred for 20 min to obtain a nanoporous composite aerogel dispersion. Sodium ascorbate promoted the cross-linking of graphene oxide and carboxylated carbon nanotubes. The combination of graphene oxide and carboxylated carbon nanotubes forms a stable, uniform and continuous three-dimensional porous network under the super strong bonding of water-based polyurethane, 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 expansion of cracks caused by load on the road surface. The addition of graphene oxide and carboxylated carbon nanotubes can increase the softening point of asphalt, reduce temperature sensitivity, and reduce 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 self-healing of cracks. Water-based polyurethane itself has good flexibility and can remain elastic in low-temperature environments, avoiding crack expansion caused by temperature contraction.

[0069] (3) N-methyl-D-glucamine was dissolved in 40 mL of water. The amount of N-methyl-D-glucamine added was 0.6 g. The introduction of N-methyl-D-glucamine enhanced the mechanical toughness of the aerogel, making it less likely 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 could still maintain stability in low temperature or humid environments. The aerogel was then added to the nanoporous composite aerogel dispersion described in step (2), reacted at 90 ° C for 6 h, cooled to room temperature, and the black hydrogel was taken out and immersed in distilled water until the aqueous solution became colorless. The aerogel was then placed in a -20 ° C refrigerator for 12 h for pretreatment, and then freeze-dried at -80 ° C for 24 h to obtain the obtained aerogel. As for the meglumine-functionalized nanoporous composite aerogel, N-methyl-D-glucosamine forms a more stable three-dimensional network by cross-linking with graphene oxide or water-based polyurethane, enhancing the mechanical strength of the aerogel and preventing structural collapse after loading other components. The meglumine-functionalized nanoporous composite aerogel has an ultra-high porosity and nanoscale pore structure, which 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. The porous structure of the aerogel has a certain thermal insulation effect, which delays the softening of asphalt at high temperature and improves the rutting resistance. At the same time, the flexible structure of the composite aerogel can absorb part of the stress and alleviate the formation of cracks caused by low-temperature shrinkage.

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

[0071] S1. Waste oil collected from restaurants is filtered to remove dirt and suspended matter to obtain waste cooking oil. Waste rubber is crushed and collected with a particle size of 70 μm to obtain waste rubber powder. The fatty acids and glycerides in the waste cooking oil can soften asphalt, improve its low-temperature crack resistance, and reduce brittle cracking in winter. The polar molecules of oil and fat can better combine with asphalt, enhancing adhesion to the crack wall and preventing moisture penetration. The high elasticity of the waste rubber powder enables the asphalt to rebound after being compressed in the crack, adapting to crack deformation and reducing the risk of debonding. It can also form a network structure after mixing with asphalt, strengthening adhesion to the old road surface and preventing moisture intrusion. In addition, the waste rubber powder can increase the viscosity of asphalt through physical cross-linking, improving its deformation resistance and promoting the high-temperature stability of the asphalt material.

[0072] S2, the recycled asphalt aggregate is placed in a 160 ° C oven and heated for 1 hour, taken out, and then the waste cooking oil and waste rubber powder described in step S1 are added, mixed for 10 minutes, and then the meglumine functionalized nanoporous composite aerogel is added, and then a high-speed shearing machine is used to shear and mix at a rate of 300 rpm for 30 minutes at a temperature of 120 ° C, and the process is carried out under nitrogen protection to obtain a road crack regeneration grouting repair material. The network structure of the meglumine functionalized nanoporous composite aerogel adsorbs and wraps the waste rubber powder, reduces the agglomeration of the waste rubber powder, and forms a skeleton-filling composite system. At the same time, the meglumine functionalized nanoporous composite aerogel Amine-functionalized nanoporous composite aerogel can promote the uniform dispersion of waste cooking oil in the porous structure of aerogel by reducing the oil-water interfacial tension, which is beneficial to the interfacial bonding of aerogel, waste rubber powder and waste cooking oil. Among them, waste cooking oil can serve as a wetting agent for aerogel and waste rubber powder, improving 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 recycled asphalt aggregate through the synergistic effect of multiple components, reduces the risk of rutting, cracking and falling off, 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 differs from Example 1 in that the meglumine-functionalized nanoporous composite aerogel does not contain graphene oxide; the preparation method of the meglumine-functionalized nanoporous composite aerogel does not include step (1), and no graphene oxide dispersion is 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 differs from Example 1 in that the meglumine-functionalized nanoporous composite aerogel does not contain aqueous polyurethane and sodium ascorbate; aqueous polyurethane and sodium ascorbate are not added in step (2) of the preparation method of the meglumine-functionalized nanoporous composite aerogel; 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 differs from Example 1 in that the pavement crack regeneration grouting repair material does not contain N-methyl-D-glucamine and waste cooking oil; the N-methyl-D-glucamine aqueous solution is not added in step (2) of the preparation method of the meglucamine functionalized nanoporous composite aerogel; the pavement crack regeneration grouting repair material does not contain waste cooking oil in step S1, and waste cooking oil is not added in step S2.

[0079] Experimental Example 1

[0080] High temperature stability test

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

[0082] Test method: A 60°C rutting test was selected to evaluate the test sample's ability to resist permanent deformation due to rutting under high temperature conditions. The specimen size was 300mm×300mm×50mm. Dynamic stability (times / mm) was obtained. The higher the value, the better the high-temperature stability and the stronger the resistance to rutting.

[0083] Figure 2The dynamic stability results of Examples 1-4 and Comparative Examples 1-3 are shown in FIG. As shown in the figure, the dynamic stability of Examples 1-4 is 7841-8527 times / mm, indicating that the high temperature stability is strong; the dynamic stability of Comparative Examples 1-3 is 5160-6785 times / mm, indicating that the high temperature stability is weak; the meglumine-functionalized nanoporous composite aerogel of Comparative Example 1 does not contain graphene oxide, which cannot exert the high thermal conductivity and sheet barrier effect of graphene oxide, and is not conducive to forming a three-dimensional highly porous network structure, which weakens the thermal insulation effect and is not conducive to delaying the softening of asphalt by high temperature, resulting in weak high temperature stability; the meglumine-functionalized nanoporous composite aerogel of Comparative Example 2 does not contain graphene oxide, which cannot exert the high thermal conductivity and sheet barrier effect of graphene oxide, and is not conducive to forming a three-dimensional highly porous network structure, which weakens the thermal insulation effect and is not conducive to delaying the softening of asphalt by high temperature, resulting in weak high temperature stability; The composite aerogel does not contain aqueous polyurethane and sodium ascorbate, which is not conducive to the cross-linking and bonding of graphene oxide and carboxylated carbon nanotubes, and cannot exert the optimization of the network structure and the bonding stability of aqueous polyurethane, is not conducive to the exertion of barrier properties 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-glucamine and waste cooking oil, and cannot cross-link and modify the nanoporous composite aerogel, is not conducive to improving the adsorption stability of waste rubber powder through interface modification and structural strengthening, is not conducive to the dispersion of aerogel and waste rubber powder in asphalt, is not conducive to the exertion of modification effect, resulting in weak high-temperature stability.

[0084] Experimental Example 2

[0085] Low temperature crack resistance test

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

[0087] Test method: The low-temperature bending beam test was selected to test the low-temperature crack resistance of the test sample. The specimen size was 250mm×30mm×35mm, the specimen loading method was midpoint loading, the test temperature was -10℃, the loading rate was 50mm / min, and the maximum flexural strain (με) and flexural strength (MPa) were obtained.

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

[0089] Experimental Example 3

[0090] Water resistance test

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

[0092] Test method: The water immersion and scattering test is selected to test the water resistance of the test sample. The specimen is a Marshall specimen with a diameter of 101.6mm±0.2mm and a height of 63.5mm±1.3mm. The specimen is immersed in a constant temperature water bath at 60℃±0.5℃ for 48h, and then placed at room temperature for 24h. The specimen is rotated and impacted by a Los Angeles abrasion tester to determine the scattering loss rate (%).

[0093] Figure 4The figure shows the scattering loss rate results of 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 meglumine-functionalized nanoporous composite aerogel of Comparative Example 1 does not contain graphene oxide, and the hydrophobicity and sheet barrier effects of graphene oxide cannot be exerted, resulting in poor water resistance; the meglumine-functionalized nanoporous composite aerogel of Comparative Example 2 does not contain aqueous polyurethane and sodium ascorbate, which is not conducive to cross-linking to form a stable, uniform, and continuous three-dimensional structure, thereby 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-glucamine and waste cooking oil, which is not conducive to forming a dense repair layer through interface modification and structural optimization, increases water infiltration, and cannot better coordinate the waste rubber powder to be evenly dispersed 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 meglumine-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 meglumine-functionalized nanoporous composite aerogel is loaded with waste cooking oil and waste rubber powder to form a three-system composite with excellent interface bonding. Through the synergistic effect of the porous structure of the aerogel and the filler, the recycled asphalt aggregate is modified, which significantly improves the high-temperature stability, low-temperature crack resistance and water resistance of the asphalt material, effectively reduces the occurrence of rutting, cracking and falling off, and is conducive to improving the effectiveness and durability of pavement crack repair.

[0095] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

[0096] The present invention and its embodiments are described above. Such description is not restrictive. The drawings show only one embodiment of the present invention, and actual applications are not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, any method and embodiment similar to the technical solution without creative design shall fall within the scope of protection of the present invention.

Claims

1. A pavement crack regeneration grouting repair material, characterized by: The pavement crack regeneration grouting repair material comprises the following components in parts by weight: 40-60 parts of meglumine-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 meglumine-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-glucamine, and 10-14 parts of sodium ascorbate; the recycled asphalt aggregate is prepared by using a milling machine to peel off the old asphalt pavement in layers, then using a jaw crusher to primarily crush the large asphalt mixture to a particle size of ≤50 mm, and then finely pulverizing it using a cone crusher and vibrating screening to obtain recycled material with a particle size of 1-3 mm.

2. A method for preparing the pavement crack regeneration grouting repair material according to claim 1, characterized in that: The specific steps include: S1. Filter the dirt and suspended solids from waste oil collected from restaurants to obtain waste cooking oil, crush the waste rubber, and collect particles with a diameter of 50-70 μm to obtain waste rubber powder; S2. Place the regenerated asphalt aggregate in an oven at 150-160° C. and heat for 1-2 hours, take it out, then add the waste cooking oil and waste rubber powder described in step S1, mix for 10-30 minutes, then add the meglumine functionalized nanoporous composite aerogel, and then use a high-speed shearing machine to shear and mix at a temperature of 100-120° C. and a rate of 300 rpm for 30-60 minutes under nitrogen protection to obtain a pavement crack regeneration grouting repair material.

3. The method for preparing the pavement crack regeneration grouting repair material according to claim 2, characterized in that: The preparation method of the meglumine-functionalized nanoporous composite aerogel specifically comprises the following steps: (1) Add 2.0-3.0 g of graphite powder to 70 mL of concentrated sulfuric acid, cool to 0 ° C in an ice bath 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 heat to 95 ° C and stir for 10-15 min, continue stirring after heating, cool, add 500 mL of deionized water and 15 mL of 30% hydrogen peroxide solution, then centrifuge and wash with 4% hydrochloric acid solution until the supernatant pH is 7.0, ultrasonicate for 10-20 min, and concentrate to obtain a graphene oxide dispersion; (2) 100 mL of the graphene oxide dispersion described in step (1) was measured and ultrasonically treated at room temperature for 1-2 h, poured into a 200 mL polytetrafluoroethylene hydrothermal reactor, 0.1-0.3 g of carboxylated carbon nanotubes was added, sodium ascorbate was added, and then 60-100 mg of aqueous polyurethane was added dropwise, and stirred for 20-30 min to obtain a nanoporous composite aerogel dispersion; (3) Dissolve N-methyl-D-glucamine in 40 mL of water, then add it to the nanoporous composite aerogel dispersion described in step (2), react at 80-90°C for 6-8 hours, cool to room temperature, take out the black hydrogel and immerse it in distilled water until the aqueous solution becomes colorless, then place it in a -20°C refrigerator for 12 hours for pretreatment, and then freeze-dry it at -80°C for 24-48 hours to obtain the meglumine-functionalized nanoporous composite aerogel.

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

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

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