A supported asphalt regenerant, a preparation method and application thereof, and a regenerated asphalt mixture and a preparation method and application thereof

Abstract

The present application relates to the technical field of asphalt regeneration, in particular to a supported asphalt regenerating agent, a preparation method and application thereof, a regenerated asphalt mixture and a preparation method and application thereof. The present application uses porous materials as carriers to separate the regeneration agent, epoxy compounds and curing agents, avoids the premature reaction of epoxy compounds and curing agents during storage, and prevents the failure of the supported asphalt regenerating agent, thereby prolonging the storage period of the supported asphalt regenerating agent, simplifying the use process, improving the asphalt regeneration effect, and enabling the regeneration agent to be in a solid state, fundamentally avoiding the leakage of traditional liquid regenerating agents, ensuring the accuracy of the regeneration agent addition and the uniformity of the dispersion in the mixture, thereby ensuring the effective amount of the regeneration agent, fundamentally ensuring the stable realization of the regeneration and recovery effect of the aged asphalt, and the supported asphalt regenerating agent provided by the present application has the advantages of good regeneration effect on waste asphalt, convenient transportation, simple use and green environmental protection.

Description

Technical Field

[0001] This invention relates to the field of asphalt recycling technology, specifically to a loaded asphalt recycling agent and its preparation method and application, and recycled asphalt mixture and its preparation method and application. Background Technology

[0002] Asphalt pavements age under the long-term influence of natural environmental factors such as light, heat, oxygen, and water, as well as traffic loads, leading to a decline in road performance and the appearance of defects such as cracks and potholes. The recycling of waste asphalt is an important direction for road maintenance, and its core lies in restoring the performance of aged asphalt through recycling agents.

[0003] Traditional asphalt recycling agents are mainly classified into the following categories: First, light component replenishing recycling agents, which use liquid substances such as aromatic oils, waste oils, or engine oils as the main components. They restore the performance of aged asphalt by replenishing the missing light components. This type of recycling agent has low cost and direct recycling effect, and is currently the most widely used. Second, chemically modified recycling agents, such as silane-modified amide-amine recycling agents and polymeric MDI system recycling agents, improve performance through chemical reactions or polarity adjustments between active components and aged asphalt. Third, compound blending recycling agents, which combine multiple components such as aromatic extracted oils, petroleum resins, naphthenic oils, and epoxidized soybean oil, and are supplemented with crosslinking agents and antioxidants to enhance the comprehensiveness and specificity of the recycling effect.

[0004] However, most of the aforementioned asphalt recycling agents are liquid, which is prone to leakage during transportation, storage, and on-site addition, resulting in material waste and environmental pollution. Furthermore, the addition of liquid recycling agents typically requires specialized modifications to mixing equipment, making the construction process complex and severely hindering the convenient promotion and application of asphalt recycling technology. These problems not only increase construction costs but also lead to insufficient or uneven dispersion of the actual effective dosage of the recycling agent, thereby weakening its recycling and restoration effect on aged asphalt. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a loaded asphalt recycling agent, its preparation method and application, and a recycled asphalt mixture, its preparation method and application. The loaded asphalt recycling agent provided by this invention has excellent recycling effect, reinforcing effect and road performance, and is easy to use. While realizing the recycling of waste asphalt, it has excellent low-temperature and high-temperature performance and durability, and can avoid recycling agent leakage, and is environmentally friendly.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: The present invention provides a loaded asphalt rejuvenator, comprising a first loaded porous material and a second loaded porous material; the first loaded porous material comprises a first porous material and an epoxy compound and a rejuvenator loaded on the first porous material; the second loaded porous material comprises a second porous material and a curing agent loaded on the second porous material.

[0007] Preferably, by mass, the loaded asphalt rejuvenator comprises the following raw materials: 4-8 parts epoxy compound, 1-5 parts curing agent, 22-28 parts rejuvenator, and a total of 63-70 parts of the first porous material and the second porous material.

[0008] Preferably, the epoxy compound includes a functionalized epoxy resin and an active epoxy diluent; The functionalized epoxy resin includes at least two of the following: multifunctional epoxy resin, dimer acid modified epoxy resin, and organosilicon modified epoxy resin. The active epoxy diluent includes at least one of cashew phenol glycidyl ether, castor oil triglycidyl ether, and polypropylene glycol diglycidyl ether. The mass ratio of the functionalized epoxy resin to the reactive epoxy diluent is 4~15:1.

[0009] Preferably, the curing agent comprises an amine curing agent with a long carbon chain; the amine curing agent with a long carbon chain comprises at least two of oleylamine, diaminopolyetheramine, and monoaminopolyetheramine.

[0010] Preferably, the regenerating agent includes at least one of castor oil, cashew nut shell oil, and cashew phenol.

[0011] This invention also provides a method for preparing the supported asphalt recycling agent described in the above technical solution, comprising the following steps: An epoxy compound, a regenerator, a first porous material, and a first anhydrous alcohol solvent are mixed and loaded in a second manner to obtain a first supported porous material. A first mixed loading of a long-chain amine curing agent, a second porous material, and a second anhydrous alcohol solvent yields a second supported porous material. The first loaded porous material and the second loaded porous material are mixed to obtain a loaded asphalt rejuvenator.

[0012] The present invention also provides the application of the loaded asphalt rejuvenator described in the above technical solution or the loaded asphalt rejuvenator prepared by the preparation method described in the above technical solution in asphalt rejuvenation.

[0013] The present invention also provides a recycled asphalt mixture, comprising, by weight, 97.5 to 98.5 parts of waste asphalt, 1.5 to 2.5 parts of asphalt recycling agent, and 0.4 to 0.7 parts of base asphalt; wherein the asphalt recycling agent comprises the loaded asphalt recycling agent described in the above technical solution or the loaded asphalt recycling agent prepared by the preparation method described in the above technical solution.

[0014] The present invention also provides a method for preparing the recycled asphalt mixture described in the above technical solution, comprising the following steps: crushing waste asphalt and mixing it with asphalt recycling agent and base asphalt to obtain recycled asphalt mixture.

[0015] The present invention also provides the application of the recycled asphalt mixture described in the above technical solution or the recycled asphalt mixture prepared by the above technical solution in road paving.

[0016] This invention employs porous materials to separately load the regenerator, epoxy compound, and curing agent, preventing premature reaction between the epoxy compound and curing agent during storage, which could lead to the failure of the loaded asphalt regenerator. This extends the shelf life of the loaded asphalt regenerator, simplifies its use, and improves the asphalt regeneration effect. During high-temperature mixing, the components loaded on the porous material (epoxy compound, long-chain amine curing agent, and regenerator) are released, thereby exerting regeneration, warm mixing, and strengthening / toughening effects.

[0017] This invention utilizes a porous material as a carrier to load the rejuvenator, ensuring the rejuvenator is in a solid state. This guarantees the accuracy of the rejuvenator's dosage and its uniform dispersion in the mixture, thus ensuring the effective dosage of the rejuvenator. This fundamentally guarantees the stable restoration effect on aged asphalt and avoids the problems of traditional liquid rejuvenators, such as easy leakage and the need to modify mixing equipment, making transportation, storage, and on-site addition extremely convenient. The loaded asphalt rejuvenator provided by this invention combines excellent rejuvenating effect on waste asphalt, convenient transportation, ease of use, and environmental friendliness.

[0018] Traditional methods of modifying recyclers using single-component epoxy or polyurethane require expensive latent curing agents or end-capped polyurethanes (isocyanates). In contrast, this invention uses porous materials as a load carrier, which can significantly reduce the cost of asphalt recyclers and improve their economic efficiency.

[0019] Building upon this, the present invention further selects long-chain amine curing agents (amine curing agents with long carbon chains). These curing agents possess monoamine groups and long carbon chains, exhibiting surface activation effects, thereby achieving a warm-mixing effect. The present invention selects toughening-modified epoxy resins (dimer acid-modified epoxy resins and / or organosilicon-modified epoxy resins) and long-chain amine curing agents in a specific ratio to ensure that the supported asphalt recycling agent has excellent reinforcing and toughening effects, and a long retention time at high temperatures.

[0020] The multifunctional epoxy resin selected in this invention has good heat resistance and weather resistance, while the previously used organosilicon-modified epoxy resin has hydrophobicity, heat aging resistance, and T... g Its superior properties, when used in conjunction with long-chain amine curing agents, can impart certain hydrophobicity and heat resistance to loaded asphalt recycling agents.

[0021] Furthermore, the loaded asphalt recycling agent provided by this invention exhibits excellent high and low temperature performance. This invention selects flexible epoxy resins (especially dimer acid-modified epoxy resin EPD-173 and organosilicon-modified epoxy resin EPSI-3866) and long-chain amine curing agents (especially polyetheramines) as key functional components. While replenishing aged asphalt with recycled components, it effectively strengthens and toughens pavement materials, enabling the recycled asphalt mixture to possess both excellent high-temperature rutting resistance and low-temperature crack resistance, thereby improving the high and low temperature performance of the pavement.

[0022] Furthermore, by selecting surface-active long-chain amine curing agents and active epoxy diluents, this invention imparts excellent warm-mixing effects to the recycling agent, which can effectively reduce the viscosity of asphalt binder at the mixing temperature, allowing the recycled asphalt mixture to be mixed and compacted at a lower temperature, significantly reducing fuel consumption and harmful gas emissions, and meeting the requirements of green and low-carbon construction.

[0023] Traditional methods of modifying recyclers using single-component epoxy or polyurethane require expensive latent curing agents or end-capped polyurethanes (isocyanates). In contrast, this invention uses porous materials as a load carrier, which can significantly reduce the cost of asphalt recyclers and improve their economic efficiency.

[0024] The load-bearing asphalt recycling agent provided by this invention integrates ease of use, excellent recycling effect, reinforcement and toughening, warm mix effect, and environmental protection performance. The recycled asphalt mixture has excellent comprehensive road performance and long-term durability, which can effectively extend the service life of recycled pavement.

[0025] The preparation method provided by this invention is simple in process, easy to operate, and has low production cost, making it suitable for industrial production. Detailed Implementation

[0026] The present invention provides a loaded asphalt rejuvenator, comprising a first loaded porous material and a second loaded porous material; the first loaded porous material comprises a first porous material and an epoxy compound and a rejuvenator loaded on the first porous material; the second loaded porous material comprises a second porous material and a curing agent loaded on the second porous material.

[0027] Unless otherwise specified, the materials and equipment used in this invention are all commercially available products in the field.

[0028] In this invention, the loaded asphalt recycling agent may include the following raw materials in parts by weight: 4-8 parts of epoxy compound, which may be 4.5-7.5 parts, or 5-7 parts, or even 5.5-6.5 parts, specifically 6 parts; 1-5 parts of curing agent, which may be 1.5-4.5 parts, or 2-4 parts, or even 2.5-3.5 parts, specifically 3 parts; 22-28 parts of recycling agent, which may be 23-27 parts, or even 24-26 parts, specifically 25 parts; a total amount of the first porous material and the second porous material of 63-70 parts, which may be 64-69 parts, or even 65-68 parts, or even 65-67 parts; and the mass fraction of the first porous material may be 48-60 parts, or even 50-57 parts, specifically 54 parts, 58 parts, or 61 parts.

[0029] In this invention, the epoxy compound may include functionalized epoxy resin and reactive epoxy diluent. Specifically, the functionalized epoxy resin may include at least two of the following: multifunctional epoxy resin, dimer acid-modified epoxy resin, and silicone-modified epoxy resin; specifically, two or three types. The multifunctional epoxy resin may specifically be multifunctional epoxy resin EPM-426; the dimer acid-modified epoxy resin may specifically be dimer acid-modified epoxy resin EPD-173; and the silicone-modified epoxy resin may specifically be silicone-modified epoxy resin EPSI-3866. In this invention, the reactive epoxy diluent may include at least one of the following: cashew nut ether, castor oil triglycidyl ether, and polypropylene glycol diglycidyl ether; specifically, one, two, or three types. In this invention, the mass ratio of the functionalized epoxy resin to the reactive epoxy diluent can be 4~15:1, or 5~13:1, specifically 5:1, 9:1 or 13:1.

[0030] In this invention, the curing agent can be an amine curing agent with a long carbon chain, and can also include at least two of oleylamine, diaminopolyetheramine and monoaminopolyetheramine, specifically two or three kinds; the diaminopolyetheramine can specifically be diaminopolyetheramine D2000; the monoaminopolyetheramine can specifically be monoaminopolyetheramine ZM-1100.

[0031] In this invention, the regenerant may include at least one of castor oil, cashew nut shell oil, and cashew phenol, specifically one, two, or three.

[0032] In this invention, the first porous material and the second porous material can be independently inorganic porous materials, specifically at least one of sepiolite and mesoporous silica; the mesoporous silica can specifically be mesoporous silica SBA-15. In this invention, when the porous material is sepiolite and mesoporous silica, the mass ratio of sepiolite to mesoporous silica can be 45~60:8~20, or 50~57:10~15, specifically 50:15, 57:10, or 54:12.

[0033] This invention also provides a method for preparing the supported asphalt recycling agent described in the above technical solution, comprising the following steps: An epoxy compound, a regenerator, a first porous material, and a first anhydrous alcohol solvent are mixed and loaded to obtain a first supported porous material. A second mixed loading of a long-chain amine curing agent, a second porous material, and a second anhydrous alcohol solvent is performed to obtain a second supported porous material. The first loaded porous material and the second loaded porous material are mixed to obtain a loaded asphalt rejuvenator.

[0034] The present invention involves first mixing and loading an epoxy compound, a regenerator, a first porous material, and a first anhydrous alcohol solvent to obtain a first supported porous material.

[0035] In this invention, both the first porous material and the second porous material can be dried before use. The drying temperature can be 100~140℃, or 105~125℃, specifically 120℃. This invention does not have a special limitation on the drying time; drying to constant weight is sufficient.

[0036] This invention first dries the porous material, removing physically adsorbed water from the pores through thermal drive. This eliminates the liquid barrier occupying the pore space, effectively avoiding the "pinning effect" and "gas-liquid displacement" resistance caused by residual moisture or air in the pores. Under negative pressure, the material can overcome the capillary wall through instantaneous pressure difference, realizing the transformation from surface coating to in-pore storage, significantly increasing the effective loading capacity of epoxy compound + regenerator (or curing agent). Moreover, the drying treatment also eliminates the competitive adsorption interface between the hydrophilic groups on the pore wall and the oil, ensuring that the epoxy compound + regenerator (or curing agent) molecules are directly anchored to the carrier matrix, avoiding water film blockage that causes the loaded material to float only on the outer surface. This ensures the complete release and diffusion activity of epoxy compound, regenerator, and curing agent when they are later incorporated into aged asphalt. In summary, the drying treatment can significantly increase the loading capacity of epoxy compound + regenerator (or curing agent), and the loaded particles exhibit better slow-release characteristics and aged asphalt regeneration effect in hot-mixed asphalt.

[0037] In this invention, the first anhydrous alcohol solvent may include anhydrous ethanol. In this invention, the mass of the first anhydrous alcohol solvent may be 40-110% of the total mass of the first porous material, or 50-95%, specifically 75%.

[0038] In this invention, the temperature of the first mixing load can be 90~110℃, or 95~105℃, specifically 100℃; the time of the first mixing load can be 40~80min, or 50~70min, specifically 60min; the first mixing load can be a vacuum-assisted mixing load, and the pressure of the vacuum-assisted mixing load can be -0.08~-0.10MPa, or -0.085~-0.095MPa, specifically -0.09MPa; the first mixing load can be carried out under stirring conditions.

[0039] After completing the first mixed loading, the present invention may further include: centrifuging, filtering, and drying the material after the first mixed loading to obtain a first loaded porous material. In the present invention, the drying temperature may be 80~120℃, or 90~110℃, and specifically 105℃.

[0040] The present invention involves a second mixed loading of a long-chain amine curing agent, a second porous material, and a second anhydrous alcohol solvent to obtain a second supported porous material.

[0041] In this invention, the second anhydrous alcohol solvent may include anhydrous ethanol. In this invention, the mass of the second anhydrous alcohol solvent may be 40-110% of the mass of the second porous material, or 50-95%, specifically 75%.

[0042] In this invention, the temperature of the second mixing load can be 90~110℃, or 95~105℃, specifically 100℃; the time of the second mixing load can be 40~80min, or 50~70min, specifically 60min; the second mixing load can be a vacuum-assisted mixing load, and the pressure of the vacuum-assisted mixing load can be -0.08~-0.10MPa, or -0.085~-0.095MPa, specifically -0.09MPa; the second mixing load can be carried out under stirring conditions.

[0043] After completing the second mixed loading, the present invention may further include: centrifuging, filtering, and drying the material after the second mixed loading to obtain a first loaded porous material. In the present invention, the drying temperature may be 80~120℃, or 90~110℃, specifically 105℃.

[0044] After obtaining the first loaded porous material and the second loaded porous material, the present invention mixes the first loaded porous material and the second loaded porous material to obtain a loaded asphalt recycling agent. The present invention does not have any special limitations on the mixing process, as long as the raw materials are mixed evenly.

[0045] This invention also provides the application of the loaded asphalt rejuvenator described in the above-described technical solutions or the loaded asphalt rejuvenator prepared by the above-described technical solutions in asphalt rejuvenation. The loaded asphalt rejuvenator provided by this invention can prevent rejuvenator leakage, has excellent rejuvenation effect, reinforcement effect, and road performance, and is easy to use. While realizing the rejuvenation of waste asphalt, it possesses excellent low-temperature and high-temperature performance and long-term durability, effectively extending the service life of rejuvenated pavements. It is also environmentally friendly and has a promising application prospect in asphalt rejuvenation.

[0046] This invention also provides a recycled asphalt mixture, comprising, by weight parts, 97.5-98.5 parts of waste asphalt, which can be 97.7-98.2 parts, specifically 98 parts; 1.5-2.5 parts of asphalt recycling agent, which can be 1.8-2.2 parts, specifically 2 parts; and 0.4-0.7 parts of base asphalt, which can also be 0.5-0.6 parts. The asphalt recycling agent includes the loaded asphalt recycling agent described in the above technical solution or the loaded asphalt recycling agent prepared by the preparation method described in the above technical solution. In this invention, the base asphalt may include 70# base asphalt and / or 90# base asphalt; the base asphalt is unused, new base asphalt.

[0047] In this invention, the waste asphalt can be graded waste asphalt particles; the graded waste asphalt particles can include small waste asphalt particles and large waste asphalt particles; the particle size of the small waste asphalt particles can be ≤8mm; the particle size of the large waste asphalt particles can be 8~26mm; the mass ratio of the large waste asphalt particles to the small waste asphalt particles can be 6~10:0~4, or 7~9:1~3, specifically 8:2. By using graded waste asphalt particles, this invention enables aggregates to form a good gradation, which helps to ensure and improve their road performance.

[0048] This invention also provides a method for preparing the recycled asphalt mixture described in the above technical solution, comprising the following steps: crushing waste asphalt and mixing it with an asphalt recycling agent and base asphalt to obtain a recycled asphalt mixture. This invention does not have a specific limitation on the crushing process; any crushing method well-known to those skilled in the art can be used. After crushing, this invention may further include sieving to obtain small and large particles of waste asphalt. In this invention, the mixing temperature can be 120~165℃, or 120~140℃, specifically 130℃; this invention does not have a specific limitation on the mixing time, as long as the mixture is uniform.

[0049] The present invention also provides the application of the recycled asphalt mixture described in the above technical solution or the recycled asphalt mixture prepared by the above technical solution in road paving.

[0050] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0051] In the following embodiments, the waste asphalt is old pavement asphalt mixture milled back, whose components include aggregates, mineral powder, and asphalt. The porous material is vacuum dried to constant weight at 120°C before use.

[0052] Example 1 (1) Composition and preparation method of loaded asphalt recycling agent Loaded asphalt recycling agents are composed of the following raw materials in parts by weight: Dimer acid modified epoxy resin EPD-173, 3 parts; Two parts of silicone-modified epoxy resin EPSI3866; 1 part castor oil triglycidyl ether; 1 part of diaminopolyetheramine D2000; Monoamino polyetheramine ZM-1100, 2 parts; 14 parts castor oil; 12 parts cashew shell oil; 50 parts of sepiolite; 15 parts of mesoporous silica SBA-15.

[0053] The preparation method of the loaded asphalt recycling agent is as follows: An epoxy compound, a regenerator, and a portion of porous material (i.e., the first porous material, consisting of 44.5 parts sepiolite and 13.5 parts mesoporous silica) were added to a magnetically stirred tank. Anhydrous ethanol was poured in, and the mixture was continuously stirred at a constant temperature of 100°C while being evacuated to -0.09 MPa for 60 minutes. After centrifugation and filtration, the resulting solid component was dried at 105°C for 2 hours to obtain the first supported porous material. The mass of anhydrous ethanol was 75% of the total mass of the first porous material.

[0054] The long-chain amine curing agent and the remaining porous material (i.e., the second porous material, 7 parts) were added to a magnetic stirring pot, anhydrous ethanol was poured in, and the mixture was stirred continuously and vacuumed (-0.09 MPa) for 60 minutes. The resulting product was centrifuged, filtered, and dried to obtain the second supported porous material. The mass of anhydrous ethanol was 75% of the second porous material.

[0055] The first loaded porous material and the second loaded porous material are mixed evenly to obtain a loaded asphalt rejuvenator.

[0056] (2) Application method of the above-mentioned load-bearing asphalt recycling agent Waste asphalt was crushed, screened, and dried to obtain waste asphalt particles of different sizes (≤8mm and 8~26mm, respectively). The waste asphalt particles with a particle size ≤8mm and 8~26mm were mixed at 130℃ in a mass ratio of 2:8. A loaded asphalt recycling agent and new 70# base asphalt were then added sequentially to the resulting graded waste asphalt particles, and mixing continued at 130℃ to obtain a recycled asphalt mixture. The mass ratio of graded waste asphalt particles, loaded asphalt recycling agent, and 70# base asphalt was 98:2:0.6.

[0057] Example 2 (1) Composition and preparation method of loaded asphalt recycling agent Loaded asphalt recycling agents are composed of the following raw materials in parts by weight: Dimer acid modified epoxy resin EPD-173, 2 parts; Two parts of silicone-modified epoxy resin EPSI3866; 0.5 parts of multifunctional epoxy resin EPM426; 0.5 parts castor oil triglycidyl ether; 0.5 parts of diaminopolyetheramine D2000; 1 part oleylamine; Monoamino polyetheramine ZM-1100, 1.5 parts; 13 parts castor oil; 12 parts cashew shell oil; 57 portions of sepiolite; 10 parts of mesoporous silica SBA-15.

[0058] The preparation method of this loaded asphalt rejuvenator differs from that of Example 1 only in that the first porous material is 51.9 parts sepiolite and 9.1 parts mesoporous silica.

[0059] (2) The application method of the above-mentioned load-type asphalt recycling agent is the same as that in Example 1.

[0060] Example 3 (1) Composition and preparation method of loaded asphalt recycling agent Loaded asphalt recycling agents are composed of the following raw materials in parts by weight: Dimer acid modified epoxy resin EPD-173, 3 parts; 2.5 parts of silicone-modified epoxy resin EPSI3866; One part of multifunctional epoxy resin EPM426; 0.5 parts of polypropylene glycol diglycidyl ether; 2 parts oleylamine; Monoamino polyetheramine ZM-1100, 2 parts; 11 parts castor oil; Cashew phenol 12 parts; 54 portions of sepiolite; 12 parts of mesoporous silica SBA-15.

[0061] The preparation method of the loaded asphalt rejuvenator: The only difference between the preparation method of the loaded asphalt rejuvenator and Example 1 is that the first porous material is 47.5 parts of sepiolite and 10.5 parts of mesoporous silica.

[0062] (2) The application method of the above-mentioned load-type asphalt recycling agent is the same as that in Example 1.

[0063] Comparative Example 1 (1) Composition and preparation method of asphalt recycling agent The asphalt recycling agent is composed of the following raw materials in parts by weight: Dimer acid modified epoxy resin EPD-173, 2 parts; Two parts of silicone-modified epoxy resin EPSI3866; One part of multifunctional epoxy resin EPM426; 0.5 parts of diaminopolyetheramine D2000; 1 part oleylamine; Monoamino polyetheramine ZM-1100, 1.5 parts; 13 parts castor oil; 13 parts cashew shell oil; 66 parts of mineral powder.

[0064] Among them, the technical indicators of mineral powder should meet the quality requirements of aggregates and mineral powder for asphalt mixtures in the "Technical Specification for Construction of Asphalt Pavement of Highway" (JTG F40-2004) for expressways and first-class highways. The mineral powder should be dried before use.

[0065] The preparation method of this asphalt recycling agent is as follows: The epoxy compound, regenerator and some mineral powder (61 parts) were added into a magnetic stirring pot and stirred evenly to obtain the first mixture; Add the long-chain amine curing agent and the remaining mineral powder (5 parts) into a magnetic stirring pot and stir evenly to obtain the second mixture; The first and second mixtures are mixed evenly to obtain an asphalt recycling agent.

[0066] (2) The application method of the asphalt recycling agent is the same as that in Example 1.

[0067] Comparative Example 2 Castor oil and cashew phenol are mixed evenly at a mass ratio of 1:1 to obtain a regenerator.

[0068] The application method of the above-mentioned asphalt recycling agent is the same as that in Example 1.

[0069] Comparative Example 3 Loaded asphalt recycling agents are composed of the following raw materials in parts by weight: Dimer acid modified epoxy resin EPD-173, 3 parts; Two parts of silicone-modified epoxy resin EPSI3866; 1 part castor oil triglycidyl ether; 3 parts of diaminopolyetheramine D2000; 14 parts castor oil; 12 parts cashew shell oil; 50 parts of sepiolite; 15 parts of mesoporous silica SBA-15; Preparation method of the loaded asphalt rejuvenator: The difference between the preparation method of the loaded asphalt rejuvenator and Example 1 is that the first porous material is 44.6 parts of sepiolite and 13.4 parts of mesoporous silica.

[0070] (2) The application method of the load-bearing asphalt recycling agent is the same as that in Example 1.

[0071] Comparative Example 4 The only difference from Example 1 is that the dimer acid modified epoxy resin EPD-174 is replaced with organosilicon modified epoxy resin EPSI-3866.

[0072] Test Example 1 Performance testing of recycled asphalt mixtures prepared in the examples and comparative examples Test methods: High temperature stability, low temperature crack resistance, water stability test, freeze-thaw splitting strength ratio: The recycled asphalt mixtures prepared in Examples 1-3 and Comparative Examples 1-3 were molded into Marshall specimens and rut slab specimens according to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTGE20-2011) and cured. Then the tests were carried out, and the test results are shown in Tables 1-2.

[0073] Table 1. Warm-mix performance of recycled asphalt mixtures

[0074] Note 1: Using a standard mold, the ratio of mass to height of the specimen was measured at different mixing temperatures. The aggregates and weights used in the specimens were kept consistent. A higher mass-to-height ratio indicates a denser mixture.

[0075] As shown in Table 1, the asphalt mixtures prepared by the loaded asphalt recycling agent provided by this invention exhibit good warm-mix performance. The Marshall stability of the recycled asphalt mixtures obtained in Examples 1-3 is above 12 kN at a mixing temperature of 130°C, and the mass-to-height ratio of the specimens is above 18.9. In Comparative Example 1, the Marshall stability is only 10.3 kN, and the mass-to-height ratio also drops to around 18.6, indicating that the non-loaded nature of the asphalt recycling agent leads to premature reaction of the epoxy component, affecting the final result. Comparative Example 2 has a Marshall stability of 9.6 kN and a mass-to-height ratio of 18.45, significantly worse than Comparative Example 1. Although the asphalt recycling agent in Comparative Example 3 still has a Marshall stability of 11.52 kN due to its higher epoxy resin content and being loaded, the mass-to-height ratio drops to 18.49 due to the lack of warm-mix components. Therefore, compared to Comparative Examples 1-3, the loaded asphalt recycling agents prepared in Examples 1-3 exhibit superior low-temperature mixing performance.

[0076] Table 2 Road performance of recycled asphalt mixtures

[0077] Note: 1. Test temperature 60℃; 2. Test temperature -10℃; 3. This refers to the stability of Marshall residue after immersion in water.

[0078] As shown in Table 2, the loaded asphalt recycling agent provided by this invention exhibits excellent recycling effect, significant reinforcing effect, and superior low-temperature and high-temperature performance when used for asphalt recycling. The dynamic stability of the recycled asphalt mixtures obtained in Examples 1-3 all exceed 5600 cycles / mm, the low-temperature flexural strain is above 2700, the freeze-thaw splitting strength ratio is above 87%, and the residual stability is above 96%. Compared with Comparative Examples 1-4, the examples show significantly better performance in all aspects. It is evident that modifying the recycling agent with porous materials can improve the transportation and use convenience of the asphalt recycling agent while ensuring the effects of recycling, modification, and warm mixing, and preventing premature reaction of the modified components.

[0079] In summary, the loaded asphalt recycling agent provided by this invention not only regenerates the asphalt mixture but also provides excellent reinforcement and toughening, effectively improving the road performance, transportation, and ease of use of the asphalt mixture. By selecting a porous material-loaded recycling agent, the problem of premature reaction of the two components affecting the final effect, which exists in reactive modified recycling agents, is effectively solved.

[0080] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A loaded asphalt recycling agent, characterized in that, It includes a first loaded porous material and a second loaded porous material; the first loaded porous material includes a first porous material and an epoxy compound and a regenerator loaded on the first porous material; the second loaded porous material includes a second porous material and a curing agent loaded on the second porous material.

2. The loaded asphalt rejuvenator according to claim 1, characterized in that, By weight, the loaded asphalt rejuvenator comprises the following raw materials: 4-8 parts epoxy compound, 1-5 parts curing agent, 22-28 parts rejuvenator, and a total of 63-70 parts of the first porous material and the second porous material.

3. The supported asphalt rejuvenator according to claim 1 or 2, characterized in that, The epoxy compound includes functionalized epoxy resin and reactive epoxy diluent; The functionalized epoxy resin includes at least two of the following: multifunctional epoxy resin, dimer acid modified epoxy resin, and organosilicon modified epoxy resin. The active epoxy diluent includes at least one of cashew phenol glycidyl ether, castor oil triglycidyl ether, and polypropylene glycol diglycidyl ether. The mass ratio of the functionalized epoxy resin to the reactive epoxy diluent is 4~15:

1.

4. The loaded asphalt rejuvenator according to claim 1, characterized in that, The curing agent includes an amine curing agent with a long carbon chain; the amine curing agent with a long carbon chain includes at least two of oleylamine, diaminopolyetheramine and monoaminopolyetheramine.

5. The supported asphalt rejuvenator according to claim 1, characterized in that, The regenerant includes at least one of castor oil, cashew nut shell oil, and cashew phenol.

6. A method for preparing the loaded asphalt recycling agent according to any one of claims 1 to 5, comprising the following steps: An epoxy compound, a regenerator, a first porous material, and a first anhydrous alcohol solvent are mixed and loaded in a second manner to obtain a first supported porous material. A first mixed loading of a long-chain amine curing agent, a second porous material, and a second anhydrous alcohol solvent yields a second supported porous material. The first loaded porous material and the second loaded porous material are mixed to obtain a loaded asphalt rejuvenator.

7. The application of the loaded asphalt rejuvenator according to any one of claims 1 to 5 or the loaded asphalt rejuvenator prepared by the preparation method according to claim 6 in asphalt rejuvenation.

8. A recycled asphalt mixture, characterized in that, The product comprises, by weight, 97.5 to 98.5 parts of waste asphalt, 1.5 to 2.5 parts of asphalt recycling agent, and 0.4 to 0.7 parts of base asphalt; wherein the asphalt recycling agent comprises the loaded asphalt recycling agent according to any one of claims 1 to 5 or the loaded asphalt recycling agent prepared by the preparation method according to claim 6.

9. The method for preparing the recycled asphalt mixture according to claim 8, characterized in that, Includes the following steps: Waste asphalt is crushed and then mixed with asphalt recycling agent and base asphalt to obtain recycled asphalt mixture.

10. The application of the recycled asphalt mixture of claim 8 or the recycled asphalt mixture prepared by the method of claim 9 in road paving.

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