A regeneration agent for asphalt pavement and preparation method thereof

Abstract

The present application discloses a regeneration agent for asphalt pavement and its preparation method. On the one hand, the present application discloses a regeneration agent for asphalt pavement, wherein the components and weight ratios of the regeneration agent for asphalt pavement include: 40 to 100 parts of aromatic oil, 10 to 40 parts of No. 90 asphalt, 5 to 30 parts of penetrant, 10 to 40 parts of AG-70 epoxy resin, 10 to 30 parts of pentaerythritol-modified acrylic fiber, 1 to 8 parts of 1,6-bismaleimidohexane, 6 to 12 parts of epoxycyclohexane, and 12 to 28 parts of pentaerythritol glycidyl ether. On the other hand, the present application also discloses a preparation method and a method of use of the above-mentioned regeneration agent for asphalt pavement. The present application can not only effectively restore the performance of waste SBS modified asphalt, but also make the various properties of the restored waste SBS modified asphalt close to those of new SBS modified asphalt.

Description

Technical Field

[0001] The present application relates to the technical field of asphalt regeneration agents, and in particular to a regeneration agent for asphalt pavement and a preparation method thereof. Background Art

[0002] Asphalt is the final product of petroleum cracking, usually in the form of a solid, semi-solid or viscous substance, and is commonly used in engineering fields such as road paving, waterproofing, moisture-proofing and corrosion prevention. Asphalt is mainly used as a road construction material. With the development of road traffic, ordinary asphalt pavement can no longer meet the needs of modern vehicle driving, and adding polymers to ordinary asphalt to improve the physical properties and anti-aging properties of ordinary asphalt is currently the most important way to improve it. Among them, by adding rubber powder and SBS to the base asphalt for modification, the asphalt can be made to have good resistance to road loads and the ability to withstand harsh environmental influences. At present, SBS modified asphalt is widely used throughout the world.

[0003] However, currently used SBS modified asphalt also suffers from aging issues. This aging can cause pavement defects such as cracks and potholes, resulting in pavement performance that no longer meets vehicle performance requirements. Therefore, SBS modified asphalt pavements require regular maintenance and repair, and severely aged pavements may even require refinishing. This maintenance, repair, and refinishing process generates a significant amount of waste asphalt mixture. If not properly handled, this waste not only pollutes the environment but also significantly wastes natural resources.

[0004] Currently, the recycling of waste SBS asphalt typically involves the use of regeneration agents to restore the properties of the aged asphalt. Existing asphalt regeneration agents typically include light oil, reactive SBS regeneration agents, base asphalt, and various additives.

[0005] However, since SBS-modified asphalt is composed of base asphalt and SBS modifier, its aging process involves both the base asphalt and the SBS, resulting in a complex aging mechanism. Existing asphalt regeneration agents primarily utilize highly aromatic components to restore the chemical composition and colloidal structure of aged asphalt, while simultaneously utilizing reactive SBS regeneration agents to repair broken SBS molecules, thereby restoring asphalt properties such as viscosity, low-temperature ductility, softening point, and penetration. However, when used in road paving, the rutting resistance, crack resistance, and aging resistance of waste SBS-modified asphalt treated with existing regeneration agents significantly differ from those of pavements paved with new SBS-modified asphalt. Summary of the Invention

[0006] In order to solve at least one of the above technical problems, an asphalt regeneration agent is developed that can effectively restore the performance of waste SBS modified asphalt, so that the various properties of the restored waste SBS modified asphalt are close to those of new SBS modified asphalt. The present application provides a regeneration agent for asphalt pavement and a preparation method thereof.

[0007] On the one hand, the present application provides a regeneration agent for asphalt pavement, the components and weight ratios of the regeneration agent for asphalt pavement include: 40 to 100 parts of aromatic oil, 10 to 40 parts of No. 90 asphalt, 5 to 30 parts of penetrant, 10 to 40 parts of AG-70 epoxy resin, 10 to 30 parts of pentaerythritol-modified acrylic fiber, 1 to 8 parts of 1,6-dimaleimidohexane, 6 to 12 parts of cyclohexene oxide, and 12 to 28 parts of pentaerythritol glycidyl ether.

[0008] Optionally, the components and weight proportions of the asphalt pavement regeneration agent include: 65-75 parts of aromatic oil, 12-18 parts of No. 90 asphalt, 12-18 parts of penetrant, 20-24 parts of AG-70 epoxy resin, 18-24 parts of pentaerythritol-modified acrylic fiber, 2-4 parts of 1,6-dimaleimidohexane, 8-10 parts of cyclohexane oxide, and 18-24 parts of pentaerythritol glycidyl ether.

[0009] By adopting the above technical solution, the regeneration agent of the present application includes aromatic oil, matrix asphalt, penetrant and reactive repair component, which can fully penetrate into the interior of the aged asphalt while effectively restoring the aged asphalt and aged SBS molecules, so that the aged SBS modified asphalt can be fully repaired, and the various properties of the regenerated asphalt can be effectively improved; the reactive repair component of the present application adopts a specific low-viscosity epoxy resin, as well as epoxy cyclohexane and pentaerythritol glycidyl ether, a single epoxy group, a multi-epoxy group and an AG70 epoxy resin compound, which can effectively control the ratio of high, medium and low viscosity components in the asphalt component when repairing SBS chain breaks, so that the viscosity and softening point of the repaired asphalt are at a better level, and at the same time, a certain amount of The network structure of the asphalt after repair is effectively improved, and the strength and toughness of the repaired asphalt are obtained, and better low-temperature performance is obtained; 1,6-dimaleimidohexane is added to the reactive repair component of the present application, and when it is used to repair asphalt, it effectively improves the strength, toughness and rutting resistance of the regenerated asphalt, and at the same time, increases the antioxidant and high-temperature aging resistance of the regenerated asphalt; the present application adds modified acrylic fiber, which can not only effectively enhance the strength and toughness of the asphalt, but also effectively enhance the low-temperature crack resistance of the asphalt. At the same time, the hydroxyl and carboxyl groups of the modified fiber can also form a cross-linking reaction with the cross-linking component and the epoxy group, further promoting the formation of a network structure in the asphalt during regeneration and repair; after the ratio of the present application is optimized, the above-mentioned properties of the regenerated asphalt can be further improved.

[0010] Optionally, the asphalt pavement rejuvenating agent further includes 4 to 10 parts of AEO-7 fatty alcohol polyoxyethylene ether.

[0011] By adopting the above technical solution, the present application adds a small amount of AEO-7 fatty alcohol polyoxyethylene ether as a surfactant, which can play a certain role in dispersing the agglomerated asphalt in the aged asphalt component and promoting the fusion of the reactive repair component and the aged asphalt; moreover, the use of the above surfactant can also have a volume expansion effect, which can further enhance the permeability of the regeneration agent, effectively improve the contact between the reactive repair component and the SBS in the aged asphalt, improve the repair rate of the aged SBS component, and further improve the various performances of the regenerated asphalt.

[0012] Further optionally, the asphalt pavement rejuvenating agent further includes 2 to 8 parts of n-butyl glycidyl ether modified polydimethylsiloxane.

[0013] By adopting the above-mentioned technical solution, after adding the n-butyl glycidyl ether modified polydimethylsiloxane component in the present application, the modified n-butyl glycidyl ether group can enable the polydimethylsiloxane to obtain an active group, and the active group can react with the hydroxyl and carboxyl groups contained in the aromatic hydrocarbons in the asphalt component to form a cross-link between the polydimethylsiloxane and the above-mentioned component. The generated cross-linked product can not only enhance the toughness of the asphalt, but also after the introduction of the polydimethylsiloxane group, the waterproof performance of the asphalt can be improved to a certain extent; the present application also limits the amount of n-butyl glycidyl ether modified polydimethylsiloxane. By limiting the amount, it can not only ensure that the asphalt obtains the above-mentioned performance improvement, but also ensure that the asphalt will not be excessively affected by the introduction of these macromolecular groups, resulting in an excessive impact on the softening point and ductility.

[0014] Optionally, the aromatic oil is selected from one or more of cracking oil slurry, extracted oil, rubber oil and waste lubricating oil.

[0015] Optionally, the penetrant is epoxidized soybean oil or furfural oil.

[0016] Optionally, the asphalt pavement regeneration agent further includes 1 to 5 parts of a stabilizer.

[0017] Further optionally, the stabilizer includes an anti-ultraviolet agent and an antioxidant.

[0018] By adopting the above technical solution, the present application adds a stabilizer component to the regeneration agent, which can further improve the anti-aging performance of the regenerated asphalt.

[0019] On the other hand, the present application also provides a method for preparing the above-mentioned asphalt pavement regeneration agent, comprising the following steps:

[0020] S1. Aromatic oil, AG-70 epoxy resin, cyclohexene oxide and pentaerythritol glycidyl ether are mixed at a temperature of 100 to 120° C. and sheared and stirred to obtain a mixed oil;

[0021] S2. Add the formulated amount of penetrant to the mixed oil obtained in step S1, and stir evenly at a temperature of 80-100° C. to obtain an oil phase component;

[0022] S3: Heat the formulated amount of No. 90 asphalt until the asphalt is in a fluid state;

[0023] S4: Add the fluid asphalt obtained in step S3 and the remaining components to the oil phase component obtained in step S2, stir evenly at a temperature of 140-165° C., and naturally cool to room temperature to obtain a regeneration agent for asphalt pavement.

[0024] Thirdly, the present application also provides a method for using the above-mentioned asphalt pavement regeneration agent, wherein the asphalt pavement regeneration agent is used for regenerating waste SBS modified asphalt, and the amount of the asphalt pavement regeneration agent used is 8 to 12% of the mass of the waste SBS modified asphalt.

[0025] In summary, the present invention includes at least one of the following beneficial technical effects:

[0026] 1. This application designs a regeneration agent for SBS modified asphalt including aromatic oil, base asphalt, penetrant and reactive repair component. While effectively restoring aged asphalt and aged SBS molecules, it can fully penetrate into the interior of the aged asphalt, so that the aged SBS modified asphalt can be fully repaired, effectively improving the various properties of the regenerated asphalt.

[0027] 2. The reactive repair component of the regeneration agent of the present application adopts a specific epoxy resin, as well as cyclohexene oxide and pentaerythritol glycidyl ether. The epoxy groups of the above components can effectively repair the broken SBS molecules; at the same time, the reactive repair component of the regeneration agent of the present application adopts the above components to effectively control the viscosity of the regenerated asphalt.

[0028] 3. The reactive repair component of the regeneration agent of the present application is added with 1,6-dimaleimidohexane, which can form cross-links with certain components containing active double bonds in the asphalt while repairing, and can effectively improve the strength, toughness and high-temperature performance of the regenerated asphalt.

[0029] 4. The preparation method of the asphalt regeneration agent of the present application is simple, the process conditions are mild, the raw materials used are simple and easy to obtain, and the preparation cost is relatively low.

[0030] 5. This application can effectively regenerate and reuse waste SBS modified asphalt. In addition to being able to reuse a large amount of waste SBS modified asphalt solid waste generated by road construction and maintenance, thereby significantly reducing environmental pollution, it can also effectively improve the resource recycling rate. DETAILED DESCRIPTION

[0031] The present application is further described in detail below with reference to the embodiments.

[0032] The present application designs a regeneration agent for asphalt pavement, and the components and weight proportions of the regeneration agent for asphalt pavement include: 40-100 parts of aromatic oil, 10-40 parts of No. 90 asphalt, 5-30 parts of penetrant, 10-40 parts of AG-70 epoxy resin, 10-30 parts of pentaerythritol-modified acrylic fiber, 1-8 parts of 1,6-dimaleimidohexane, 6-12 parts of cyclohexene oxide, and 12-28 parts of pentaerythritol glycidyl ether.

[0033] The asphalt pavement regeneration agent of the present application is prepared by the following method, comprising the following steps:

[0034] S1. Aromatic oil, AG-70 epoxy resin, cyclohexene oxide and pentaerythritol glycidyl ether are mixed at a temperature of 100 to 120° C. and sheared and stirred to obtain a mixed oil;

[0035] S2. Add the formulated amount of penetrant to the mixed oil obtained in step S1, and stir evenly at a temperature of 80-100° C. to obtain an oil phase component;

[0036] S3: Heat the formulated amount of No. 90 asphalt until the asphalt is in a fluid state;

[0037] S4: Add the fluid asphalt obtained in step S3 and the remaining components to the oil phase component obtained in step S2, stir evenly at a temperature of 140-165° C., and naturally cool to room temperature to obtain a regeneration agent for asphalt pavement.

[0038] Prior to this application, SBS-modified asphalt rejuvenators in the art generally consisted of three main components: base asphalt, an aromatics-rich oil, and a reactive rejuvenating agent. A small number of rejuvenating agents in the art do not contain the base asphalt component, but instead replace the base asphalt with a resin material (e.g., epoxy resin).

[0039] Existing regeneration agents in the field work by utilizing aromatic-rich oils to repair the asphalt components in aged SBS-modified asphalt, thereby reducing viscosity, increasing ductility, replenishing aromatic components, and restoring performance. Reactive regeneration agents, which are often composed of active substances containing epoxy groups, are used to reconnect broken SBS molecules in aged SBS-modified asphalt, restoring triblock SBS molecules and restoring performance. The addition of matrix asphalt or resin materials aids in repairing the asphalt components, enhancing their strength and toughness.

[0040] However, SBS modified asphalt has a complex composition and aging process, which is not yet fully understood in the field. Furthermore, aged SBS modified asphalt is severely solidified, making it difficult for the regeneration agent to fully penetrate, resulting in limited repair effectiveness.

[0041] Existing reactive regeneration agents, mostly using glycidyl ethers with mono-, di-, or tri-epoxy functional groups, can effectively reconnect some broken SBS molecules and repair the triblock SBS molecules, but they also present numerous problems. Mono-epoxy glycidyl ethers have limited reactivity and a relatively limited repair effect. While di- or tri-epoxy glycidyl ethers significantly increase reactivity and offer significant repair effects, their higher reactivity can cause them to react with some components in the asphalt, resulting in uncontrolled viscosity of the regenerated asphalt and a lower softening point, which in turn affects the high-temperature performance of the regenerated asphalt.

[0042] Therefore, when using existing regeneration agents to repair aged SBS modified asphalt, even if the performance indicators such as penetration, viscosity, softening point and ductility of the regenerated asphalt can be restored to a level close to that of new asphalt, its strength, crack resistance and high-temperature deformation resistance will still be far behind those of new asphalt.

[0043] Through experimental research, the inventors of this application devised a solution to address the aforementioned issues. This solution utilizes a small amount of base asphalt and aromatic oil as the primary repair components for the asphalt component. Furthermore, a specific epoxy resin, along with cyclohexene oxide and pentaerythritol glycidyl ether, serves as the reactive active component to repair SBS molecules.

[0044] The AG70 epoxy resin used in this application is a low-viscosity resin containing epoxy functional groups. When repairing SBS chain breaks, it is possible to obtain SBS components with longer chain lengths, so that a certain proportion of high-viscosity components is obtained in asphalt. By controlling the amount of resin added, it is possible to ensure that the viscosity of the high-viscosity component in the asphalt after repair is controlled within a certain range, and its asphalt repair effect is significantly better than that of ordinary epoxy resins. Cyclohexene oxide has a monoepoxy functional group. When repairing SBS chain breaks, this low-viscosity repair component can soften asphaltene and reduce the softening point of aged SBS modified asphalt. The viscosity of the SBS component obtained by repairing is relatively low, and the proportion of low-viscosity components in asphalt can be effectively increased. Pentaerythritol glycidyl ether has a tetraepoxy functional group. Although it is also a low-viscosity component, when repairing SBS chain breaks, the tetraepoxy functional group can form crosslinks between the SBS components of the chain breaks, which can increase the ratio of medium-viscosity components in asphalt, increase the penetration of SBS asphalt, and improve the low-temperature performance of aged asphalt.

[0045] By using a specific monoepoxy-functionalized cyclohexane and tetraepoxy-functionalized pentaerythritol glycidyl ether compound, along with the addition of AG-70 epoxy resin, the SBS molecules are repaired while achieving an optimal ratio of high, medium, and low viscosity components in the repaired asphalt. This results in improved ductility, penetration, and softening point, while maintaining optimal viscosity. This compounding not only controls viscosity and various asphalt properties, but also allows the repaired SBS components to form a network structure through cross-linking. This not only effectively enhances the regenerated asphalt's crack and deformation resistance, effectively increases its strength and toughness, but also provides the asphalt with improved low-temperature performance.

[0046] This application also adds a repair agent, 1,6-dimaleimidohexane. The addition of 1,6-dimaleimidohexane allows its double bonds to react with SBS molecules and components containing active double bonds in asphalt. The double bonds of 1,6-dimaleimidohexane react with SBS molecules and components containing active double bonds in asphalt to form a partial cross-linked network structure in the asphalt, further improving the crack resistance and deformation resistance of the recycled asphalt. The above addition reaction can produce stable maleimide groups in the cross-linked molecules. The presence of the above groups can effectively improve the high-temperature performance of asphalt, while also improving the antioxidant and high-temperature aging resistance of the recycled asphalt.

[0047] The regeneration agent of the present application also contains pentaerythritol-modified acrylic fiber. This modified fiber is prepared by immersing acrylic fiber in a pentaerythritol solution for more than 30 minutes, followed by drying at a medium temperature of 200-240°C for 10-15 minutes. The modification treatment can impart strong thermal stability and strength to the acrylic fiber. Furthermore, the acrylic fiber can be heat-treated to produce carboxyl groups, and through cross-linking modification, hydroxyl groups can be obtained. The presence of these groups can react with epoxy groups and cross-linking components to further promote the formation of a network structure within the asphalt, enhancing the toughness and strength of the asphalt. Furthermore, the introduction of the modified fiber can significantly enhance the asphalt's low-temperature crack resistance.

[0048] The following are the examples and test experiments of this application. The sources of the raw materials of the components used in the examples of this application are as follows:

[0049] Asphalt No. 90 - SK90# asphalt; aromatic oil (cracking oil slurry, extracted oil, aromatic content ≥55%) - Sinopec; furfural oil - Nantong Runfeng Petrochemical Co., Ltd.; AG-70 epoxy resin - Shanghai Huayi Resin Co., Ltd.; acrylic fiber - Jiangsu Sisiyuan Fiber Co., Ltd.; 1,6-bismaleimidohexane (BMIH) - Beijing Bailingwei Technology Co., Ltd.; cyclohexane oxide - Shanghai Maclean Biochemical Technology Co., Ltd.; pentaerythritol glycidyl ether - Shanghai Maclean Biochemical Technology Co., Ltd.; AEO-7 fatty alcohol polyoxyethylene ether - BASF; n-butyl glycidyl ether modified polydimethylsiloxane - Guangzhou Shanghe Chemical Technology Co., Ltd.; anti-UV agent - Nantong Runfeng Petrochemical Co., Ltd.; antioxidant - Nantong Runfeng Petrochemical Co., Ltd.

[0050] The following are Examples 1 to 7 of the present application. The specific ratio parameters are shown in Table 1 below. They were prepared using the preparation method of the present application.

[0051] Table 1 Proportions of Examples 1 to 7

[0052]

[0053]

[0054] Detection experiment:

[0055] Example 1 and Example 4 of the invention patents with publication numbers CN112251036A and CN115477852A were used as regeneration agents for Comparative Examples 1 and 2, respectively.

[0056] Based on Example 4 of the present application, the AG-70 resin was replaced with ordinary epoxy resin as Comparative Example 3, BMIH was not added as Comparative Example 4, pentaerythritol glycidyl ether was replaced with 4-butanediol diglycidyl ether with a diepoxy group as Comparative Example 5, cyclohexene oxide was not added as Comparative Example 6, cyclohexene oxide was replaced with 4-butanediol diglycidyl ether with a diepoxy group as Comparative Example 7, and ordinary acrylic fiber was added as Comparative Example 8.

[0057] 1. Asphalt regeneration experiment uses SBS modified asphalt produced by SK Company as experimental asphalt, and takes part of the asphalt for oven aging treatment at a treatment temperature of 165°C for 24 hours.

[0058] The aged SBS modified asphalt was regenerated using the regeneration agents of Examples 1 to 7 of the present application and the regeneration agents of Comparative Examples 1 to 8, respectively. When the regeneration agents of Examples 1 to 7 were used for treatment, the amount of the regeneration agents added was 12% of the mass of the aged SBS modified asphalt.

[0059] Samples of unaged and aged SBS modified asphalt were taken, as well as samples of regenerated SBS modified asphalt. The viscosity, penetration, softening point, and ductility of the asphalt were tested. The results are shown in Table 2 below.

[0060] Among them, the viscosity at 135°C is measured according to the method specified in JTJ052-2000 "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering"; the needle penetration is tested according to GB / T4509-2010 "Asphalt Needle Penetration Determination Method"; the softening point is measured according to GB / T4507-2010 "Asphalt Softening Point Determination Method"; and the ductility is measured according to GB / T4508-2010 "Asphalt Ductility Determination Method".

[0061] Table 2 Performance test data of asphalt before and after aging and after regeneration

[0062]

[0063]

[0064] 2. Asphalt mixture regeneration experiment

[0065] An asphalt mixture was prepared using SBS modified asphalt produced by SK as the experimental asphalt. The coarse aggregate was 10-15 mm crushed stone, the fine aggregate was natural sand, and the filler was 42.5% Portland cement. The mixture was prepared in a mass ratio of 45:105:20:15. Samples measuring 20 × 20 × 4 cm were prepared. Some of the samples were oven-aged at 165°C for 24 hours.

[0066] Regenerated asphalt obtained from the asphalt regeneration experiments, using the regeneration agents of Examples 1-7 and Comparative Examples 1-7, was used to regenerate aged asphalt. Regenerated asphalt mixture samples were prepared using the same experimental proportions. Samples of the aforementioned asphalt mixtures and the regenerated asphalt mixtures were collected and tested for Marshall stability, dynamic stability, and 10°C splitting strength. The results are shown in Table 3.

[0067] in:

[0068] Marshall stability, dynamic stability and: are measured in accordance with JTGE20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering";

[0069] Freeze-thaw splitting residual strength ratio: measured in accordance with JTJ052-2000 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering".

[0070] Table 3 Performance test data of asphalt mixture and recycled asphalt mixture

[0071]

[0072]

[0073] It can be seen from the data in Table 2 that the existing regeneration agent uses AG-70 resin containing epoxy groups and a compound of glycidyl ethers of monoepoxy groups and tetraepoxy groups as reactive regeneration components, coupled with oil phase components and various additives, which can effectively restore the viscosity, needle penetration, softening point temperature and ductility indicators of aged asphalt to a level close to that of new asphalt. The relevant performance of the regenerated asphalt prepared by it is better than that prepared by the regeneration agent of the existing technology. By comparing the data of Example 4 in Table 2 with the data of Comparative Example 3 and Comparative Examples 5 to 7, it can be seen that the present application uses AG-70 resin and a compound of glycidyl ethers of monoepoxy groups and tetraepoxy groups to effectively control the viscosity of the regenerated asphalt and effectively improve the needle penetration and ductility of the regenerated asphalt. The regenerated asphalt has a softer texture, better elasticity, and better softening point temperature recovery. Without adding monoepoxy cyclohexane, or replacing it with glycidyl ethers of polyepoxy groups, although the other properties of the regenerated asphalt can be effectively restored, the viscosity will increase significantly, the texture will be harder, and the elasticity recovery will be poor. By comparing the data of Example 4 in Table 2 with the data of Example 3, Comparative Example 3, and Examples 5 to 7, it can be seen that the amount of AG-70 resin selected in the present application has a significant impact on the performance of the regenerated asphalt. If ordinary epoxy resin is used, the viscosity of the regenerated asphalt is difficult to recover well, and if the amount of AG-70 resin is too large, the viscosity of the regenerated asphalt will also be high. Therefore, reasonable control of the ratio of AG-70 resin and glycidyl ethers of monoepoxy groups and tetraepoxy groups is critical to the viscosity recovery of recycled asphalt.

[0074] The data in Table 3 show that the regeneration agent of the present application can significantly repair SBS molecules and form a network structure. The regenerated asphalt mixture obtained after the regeneration and repair is significantly better than that of Comparative Examples 1 and 2 in terms of dynamic stability, high temperature and low temperature performance. By comparing the data in Table 3, the regeneration agent of Example 4 of the present application with the data of Comparative Examples 3 to 7, as well as Examples 3 and Examples 5 to 7, it can be seen that the regeneration agent of the present application, after compounding with AG-70 resin and glycidyl ethers of monoepoxy groups and tetraepoxy groups and making appropriate proportions, can significantly increase the network structure of the regenerated asphalt, which can effectively improve the low-temperature crack resistance and rutting resistance of the asphalt; changing the compounding of AG-70 resin and glycidyl ethers of monoepoxy groups and tetraepoxy groups, the elasticity, strength and low-temperature crack resistance of the regenerated asphalt will all decrease to varying degrees. At the same time, the addition of BMIH in the present application also has a certain effect on the performance of the regenerated asphalt. The cross-linking effect generated by the double bonds of BMIH can further promote the formation of a cross-linked network structure in the asphalt. A comparison of the data in Table 3 between Example 1, Example 4, and Comparative Example 4 shows that the addition of BMIH can further improve the crack resistance and deformation resistance of the regenerated asphalt. A comparison of the data in Table 3 between Examples 1 to 7 and Comparative Example 8 shows that after the addition of modified acrylic fiber, the low-temperature splitting strength of the regenerated asphalt mixture prepared with the regenerated asphalt prepared with the regeneration agent of the present application is significantly improved compared to the regeneration agent in Comparative Example 8 that added ordinary acrylic fiber. This shows that the addition of modified acrylic fiber, with its reactivity and fiber stability, can enhance the asphalt performance compared to ordinary fiber, achieving a greater performance improvement.

[0075] It can also be seen from the data in Table 2 and Table 3 that by optimizing the ratio of this application, the regeneration and repair effect can be further improved.

[0076] In the regeneration agent of this application, the aromatic oil can also be made from oils containing large amounts of aromatics, such as cracking oil, extracted oil, rubber oil, and waste lubricating oil. The penetrant can be replaced with epoxidized soybean oil instead of furfural oil. These component substitutions do not significantly affect the regeneration and repair effectiveness of the regeneration agent and can be selected based on cost and viscosity requirements.

[0077] The following are Examples 8 to 16 of the present application, which further optimize the ratio of the present application, especially the ratio of the AG-70 resin and the glycidyl ether of monoepoxy group and tetraepoxy group, in order to obtain better performance.

[0078] The specific ratio parameters of Examples 8 to 16 of the present application are shown in Table 4 below, and they were prepared using the preparation method of the present application.

[0079] Table 4 Proportions of Examples 8 to 16

[0080]

[0081]

[0082] The thermosetting resin described in Example 5 of publication number CN109704648A was used as an additive to replace the BMIH in Example 13 of the present application. The resulting regeneration agent was used as Comparative Example 9, and the regeneration agent without adding fiber was used as Comparative Example 10.

[0083] According to the experimental method described in the test experiment, the regeneration performance of the asphalt regeneration agents of Examples 8 to 16 of the present application and Comparative Examples 9 to 10 was tested. The specific results are shown in Table 5 below.

[0084] Table 5 Performance test data of asphalt before and after aging and regeneration in Examples 8 to 16

[0085] Viscosity Needle penetration Softening point Elongation Example 8 1.41 46.3 88.3 27.22 Example 9 1.37 47.9 88.7 28.44 Example 10 1.39 47.2 87.9 27.34 Example 11 1.33 48.2 87.2 30.27 Example 12 1.31 48.9 86.7 29.68 Example 13 1.36 48.6 89.1 32.17 Example 14 1.23 39.2 77.1 26.47 Example 15 1.34 46.1 83.9 30.66 Example 16 1.46 40.7 84.2 26.11 Comparative Example 9 1.49 46.1 92.7 25.93 Comparative Example 10 1.32 48.8 87.4 32.19

[0086] According to the experimental method recorded in the test experiment, regenerated asphalt prepared with the asphalt regeneration agent of Examples 8 to 16 of the present application and Comparative Examples 9 to 10 was used to prepare regenerated asphalt mixtures, and various properties of the regenerated asphalt mixtures were tested. The specific results are shown in Table 6 below.

[0087] Table 6 Performance test data of asphalt mixtures before and after aging and after regeneration in Examples 8 to 16

[0088]

[0089] The data in Table 5 show that after optimizing the ratio of the present application, the regeneration and repair effect can be significantly improved. Using the following ratio: 65-75 parts aromatic oil, 12-18 parts No. 90 asphalt, 12-18 parts penetrant, 20-24 parts AG-70 epoxy resin, 2-4 parts 1,6-bismaleimidohexane, 8-10 parts cyclohexene oxide, and 18-24 parts pentaerythritol glycidyl ether; the regeneration and repair effect of the present application's regeneration agent is relatively better. The viscosity of the regenerated asphalt can be restored to a level close to that of new asphalt, and the penetration, ductility, and softening point can also be restored to levels close to, or even partially exceed, those of new asphalt.

[0090] The data in Table 6 show that the regeneration and repair effect of the regeneration agent of Example 13 of the present application is significantly better than that of the other examples in Examples 1 to 16, and significantly better than that of the regeneration agents of Comparative Examples 1 to 7. This shows that the present application precisely optimizes the ratio of AG-70 epoxy resin, cyclohexene oxide, and pentaerythritol glycidyl ether, controls the addition amounts of aromatic oil and base asphalt, and simultaneously adds an appropriate amount of BMIH. The resulting regeneration agent, after regeneration and repair of SBS asphalt, is able to fully form a network structure within the asphalt, fully repair SBS chain breaks, and introduce corresponding modifying groups, significantly improving the asphalt's strength, elasticity, and high and low temperature properties.

[0091] By comparing the data of Example 13 and Examples 14 to 16 in Table 6, it can be seen that in the reactive repair components of the present application, AG-70 epoxy resin, BMIH and cyclohexene oxide are indispensable core components. The lack of AG-70 epoxy resin will lead to a significant reduction in the content of high-strength macromolecular network cross-linked structure in the regenerated asphalt. Although the viscosity is significantly reduced, the dynamic stability and low-temperature splitting strength of the asphalt mixture configured with it are greatly reduced, and the strength and toughness of the asphalt are obviously insufficient. The lack of BMIH will also lead to a reduction in the cross-linked network structure in the regenerated asphalt, and will affect the high-temperature performance of the regenerated asphalt. The lack of cyclohexene oxide will cause the viscosity of the regenerated asphalt to increase significantly, and at the same time will reduce the effect of SBS repair, resulting in varying degrees of reduction in the strength, toughness, and high-temperature performance of the regenerated asphalt.

[0092] Comparing the data in Tables 5 and 6 for Examples 8-13 of the present application and Comparative Examples 9-10 reveals that the performance improvement of regenerated asphalt using conventional modifying additives is significantly less effective than that achieved with the chemical additives of the present application. While the absence of fiber improves the viscosity, penetration, and ductility of the regenerated asphalt, the strength, toughness, and low-temperature crack resistance of the regenerated asphalt mixture produced from the resulting regenerated asphalt are poor.

[0093] Comparing the data from Examples 8-13 of this application, combined with the furfural oil addition levels of Examples 8-13, shows that a relatively large proportion of furfural oil further enhances the performance of the regeneration agent. This suggests that increasing the regeneration agent's penetration, allowing it to fully integrate with the various components of aged asphalt, significantly impacts its performance.

[0094] In order to further improve the performance of the regeneration agent of the present application, considering that there are many agglomerated components in aged asphalt, the regeneration agent is difficult to completely penetrate and disperse into the aged asphalt during repair. The inventors have designed an improved scheme of adding specific surfactants through experiments to achieve better results.

[0095] The following are Examples 17 to 22 of the present application. The component ratios and preparations of Examples 17 to 22 of the present application are consistent with those of Example 13, with the only difference being the addition of AEO-7 fatty alcohol polyoxyethylene ether as a surfactant. The specific added component ratios are shown in Table 7 below.

[0096] Table 7 Proportions of Examples 17 to 22

[0097]

[0098]

[0099] According to the experimental method described in the test experiment, the asphalt regeneration agents of Examples 17 to 22 of the present application were tested, and the specific results are shown in Table 8 below.

[0100] Table 8 Performance test data of asphalt before and after aging and after regeneration in Examples 17 to 22

[0101] Viscosity Needle penetration Softening point Elongation Example 17 1.34 52.2 90.6 33.42 Example 18 1.32 53.1 91.3 33.79 Example 19 1.31 54.6 91.9 34.27 Example 20 1.28 54.8 92.2 34.29 Example 21 1.34 50.8 89.7 32.81 Example 22 1.26 54.9 92.4 34.66

[0102] According to the experimental method described in the test experiment, regenerated asphalt mixtures were prepared using the asphalt regeneration agents of Examples 17 to 22 of the present application, and various properties of the regenerated asphalt mixtures were tested. The specific results are shown in Table 9 below.

[0103] Table 9 Performance test data of asphalt mixtures before and after aging and after regeneration in Examples 17 to 22

[0104]

[0105] The data in Tables 8 and 9 show that the regenerated asphalt obtained after the regeneration agents of Examples 17 to 22 of the present application were used to repair aged asphalt, and the regenerated asphalt mixtures prepared therefrom, exhibited significant improvements in various properties compared to the regeneration agents of Examples 1 to 16, even surpassing those of new SBS-modified asphalt. Compared to Example 13, which did not include the aforementioned surfactant, the properties of the regenerated asphalt mixture were improved by more than 10%. This indicates that the addition of AEO-7 fatty alcohol polyoxyethylene ether as a surfactant effectively enhances the mutual solubility between aromatic oil and aged asphaltene. Furthermore, the surfactant disperses aggregated asphaltene within the aged asphalt component, promoting the fusion of the reactive repair component and the aged asphaltene, thereby enhancing the repair effect. Furthermore, the inventors speculate that the aforementioned surfactant, when applied to asphalt, can also act as a solubilizer, assisting in improving permeability and promoting the penetration of the reactive repair component into the aged asphaltene, thereby increasing the regeneration agent's repair rate for aged asphalt and effectively improving the regeneration and repair effect of the regeneration agent.

[0106] The following are Examples 23 to 28 of the present application, whose component ratios and preparation are consistent with those of Example 20, with the only difference being the addition of a modification aid, n-butyl glycidyl ether modified polydimethylsiloxane. The specific added component ratios are shown in Table 10 below.

[0107] Table 10 Proportions of Examples 23 to 28

[0108]

[0109] According to the experimental method recorded in the test experiment, Example 20 of the present application was used as a comparison item, and the regenerated asphalt prepared by the asphalt regeneration agent of Examples 23 to 28 of the present application was used to prepare a regenerated asphalt mixture. The basic properties and waterproof performance of the regenerated asphalt mixture were tested. The specific results are shown in Table 11 below.

[0110] Among them, the waterproof performance is measured by testing the Marshall stability of the asphalt mixture in water in accordance with JTGE20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering".

[0111] Table 11 Performance test data of asphalt mixtures before and after aging and after regeneration in Examples 17 to 22

[0112]

[0113] By comparing the data in Table 11, Examples 23 to 28 with the data in Example 20, it can be seen that after adding the modifying agent n-butyl glycidyl ether modified polydimethylsiloxane, the basic performance of the regenerated asphalt mixture prepared by the regeneration agent prepared in this application did not decrease significantly, but the waterproof performance was significantly improved. By comparing the data in Examples 23 to 28, it can be seen that when the amount of modifying agent added is insufficient, the waterproof performance is not significantly improved, and when the amount of modifying agent added is too much, it will lead to a decrease in the basic performance of the regenerated asphalt mixture. It can be seen that the introduction of such macromolecular modifying groups can improve the individual properties of asphalt, but the amount needs to be strictly controlled, otherwise the basic performance of the regenerated asphalt will be reduced due to the introduction of a large number of macromolecular groups.

[0114] The following are Examples 29 to 32 of the present application, whose basic component ratios are consistent with those of Example 25, except that a stabilizer component is added. The specific added component ratios are shown in Table 12 below.

[0115] Table 12 Proportions of Examples 33 to 36

[0116]

[0117]

[0118] Performance testing

[0119] Aged SBS-modified asphalt from the test experiments was regenerated and repaired using the regeneration agent from Example 25 and the regeneration agents from Examples 29 to 32. The regenerated asphalt was then oven-aged according to the methods described in the test experiments. The properties of the regenerated asphalt were measured before and after oven aging. The results are shown in Table 13.

[0120] Table 13 Performance test data of recycled asphalt before and after aging in Examples 29 to 32

[0121] Viscosity Needle penetration Softening point Elongation Example 29 1.33 54.4 92.6 34.12 Example 29 Old 1.81 26.8 71.2 8.9 Example 30 1.32 54.4 92.4 34.13 Example 30 Old 1.85 25.9 68.2 6.77 Example 31 1.32 54.5 92.7 34.19 Example 31 Old 1.77 28.2 73.4 11.3 Example 32 1.31 54.6 92.3 34.21 Example 32 Old 1.88 25.1 67.4 4.76 Example 25 1.31 54.6 92.2 34.22 Example 25 Old 1.91 24.2 65.9 2.78

[0122] The data in Table 13 demonstrates that, after oven aging, the regenerated asphalt treated with the regeneration agents of Examples 29 to 32 of the present application exhibits superior properties to the regenerated asphalt treated with the regeneration agent of Example 25 of the present application. This indicates that the addition of the stabilizer component can delay the aging of the regenerated asphalt to a certain extent.

[0123] Application Experiment

[0124] Waste SBS asphalt planing and milling materials obtained during the maintenance of the Changzhi Expressway in Shanxi Province were selected and divided into 8 portions, each weighing 100 kg. The regeneration agent of Example 29 of the present application was used for regeneration. The specific amount used is shown in Table 14 below.

[0125] Table 14 Regeneration agent dosage

[0126] Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8 Regeneration agent dosage 7 8 9 10 12 13 14 15

[0127] Waste SBS asphalt planing materials and 8 groups of recycled asphalt were sampled and tested for viscosity, penetration, softening point temperature and ductility. The specific results are shown in Table 15 below.

[0128] Table 15 Application experiment recycled asphalt performance test table

[0129]

[0130]

[0131] The data in Table 15 shows that when the regeneration agent dosage is 7kg to 15kg, the performance of the regenerated asphalt shows a significant upward trend. When the regeneration agent dosage is above 8kg, the performance improvement of the regenerated asphalt is significant. However, when the regeneration agent dosage exceeds 12kg, the performance improvement of the regenerated asphalt decreases significantly, and the viscosity increases slightly. Therefore, the optimal dosage of the regeneration agent in this application is 8-12% of the mass of the waste asphalt.

[0132] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A regeneration agent for asphalt pavement, characterized in that: The components and weight proportions of the asphalt pavement regeneration agent include: 40-100 parts of aromatic oil, 10-40 parts of No. 90 asphalt, 5-30 parts of penetrant, 10-40 parts of AG-70 epoxy resin, 10-30 parts of pentaerythritol-modified acrylic fiber, 1-8 parts of 1,6-bismaleimidohexane, 6-12 parts of cyclohexene oxide, and 12-28 parts of pentaerythritol glycidyl ether; The pentaerythritol-modified acrylic fiber is prepared by dipping acrylic fiber in a pentaerythritol solution for more than 30 minutes, and then drying the fiber at a medium temperature of 200 to 240° C. for 10 to 15 minutes.

2. The asphalt pavement regeneration agent according to claim 1, characterized in that: The components and weight proportions of the asphalt pavement regeneration agent include: 65-75 parts of aromatic oil, 12-18 parts of No. 90 asphalt, 12-18 parts of penetrant, 20-24 parts of AG-70 epoxy resin, 18-24 parts of pentaerythritol-modified acrylic fiber, 2-4 parts of 1,6-bismaleimidohexane, 8-10 parts of cyclohexene oxide, and 18-24 parts of pentaerythritol glycidyl ether.

3. The asphalt pavement regeneration agent according to claim 1 or 2, characterized in that: The asphalt pavement rejuvenating agent also includes 4 to 10 parts of AEO-7 fatty alcohol polyoxyethylene ether.

4. The asphalt pavement regeneration agent according to claim 3, characterized in that: The asphalt pavement rejuvenating agent further comprises 2 to 8 parts of n-butyl glycidyl ether modified polydimethylsiloxane.

5. The asphalt pavement regeneration agent according to claim 1 or 2, characterized in that: The aromatic oil is selected from one or more of cracking oil slurry, extracted oil, rubber oil and waste lubricating oil.

6. The asphalt pavement regeneration agent according to claim 1 or 2, characterized in that: The penetrant is epoxidized soybean oil or furfural oil.

7. The asphalt pavement regeneration agent according to claim 1 or 2, characterized in that: The asphalt pavement rejuvenating agent further comprises 1 to 5 parts of a stabilizer.

8. The asphalt pavement regeneration agent according to claim 7, characterized in that: The stabilizer includes an anti-ultraviolet agent and an antioxidant.

9. A method for preparing a regeneration agent for asphalt pavement according to claim 1, characterized in that: The following steps are involved: S1. Aromatic oil, AG-70 epoxy resin, cyclohexene oxide and pentaerythritol glycidyl ether are mixed at a temperature of 100 to 120° C. and sheared and stirred to obtain a mixed oil; S2. Add the formulated amount of penetrant to the mixed oil obtained in step S1, and stir evenly at a temperature of 80-100° C. to obtain an oil phase component; S3: Heat the formulated amount of No. 90 asphalt until the asphalt is in a fluid state; S4: Add the fluid asphalt obtained in step S3 and the remaining components to the oil phase component obtained in step S2, stir evenly at a temperature of 140-165° C., and naturally cool to room temperature to obtain a regeneration agent for asphalt pavement.

10. A method for using the asphalt pavement regeneration agent according to claim 1, characterized in that: The asphalt pavement regeneration agent is used for regenerating waste SBS modified asphalt, and the usage of the asphalt pavement regeneration agent is 8-12% of the mass of the waste SBS modified asphalt.

Images