Efficient asphalt regenerant as well as preparation method and application thereof

Abstract

The invention relates to the technical field of asphalt regeneration, and discloses an efficient asphalt regenerant as well as a preparation method and application thereof. The furfural extract oil is used as a base oil component of the asphalt regenerant, and the heavy traffic road petroleum asphalt, the liquid coumarone resin, the oxidized polyethlene wax, the adhesion regulator capable of providing hydroxyl ions for the efficient asphalt regenerant and the kerosene are added. Therefore, the efficient asphalt regenerant is formed. The high-efficiency asphalt regenerant formed by the components is high in aging asphalt performance activation and recovery capacity, the high-temperature performance of the high-efficiency asphalt regenerant is improved while fluidity, viscosity and elasticity are greatly recovered, and more specifically, the high-efficiency asphalt regenerant improves the adhesive force between regenerated asphalt and aggregate, so that the service life of the high-efficiency asphalt regenerant is prolonged, and the service life of the high-efficiency asphalt regenerant is prolonged. The adhesiveness of the recycled asphalt and the new and old aggregate is relatively good and basically consistent, and the phenomenon of gray materials is alleviated.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt regeneration, and in particular to an asphalt regeneration agent obtained by compounding multiple substances. Background Art

[0002] Asphalt pavements are subjected to dynamic and static loads such as compressive, shear, and tensile stresses from wheel loads during their service life. Furthermore, asphalt pavements are exposed to the elements for extended periods of time, subject to the effects of various natural factors such as oxygen, sunlight, temperature, water, and wind. This causes the asphalt in the pavement to gradually lose its fluidity and plasticity, becoming hard and brittle. This process is known as asphalt aging. Asphalt aging essentially involves the conversion of low-molecular components into high-molecular components, specifically oils into resins, resins into asphaltenes, and ultimately, an increase in asphaltene. Specifically, asphalt aging results in a decrease in saturates and aromatics, while an increase in asphaltenes and colloids. This material transformation is a mutual migration and conversion process.

[0003] The design life of asphalt pavement is 10 to 15 years. After the design life expires and the asphalt ages, the asphalt pavement needs to be excavated or milled, and the recycled materials of the old asphalt pavement need to be collected and recycled.

[0004] For the recycling and reuse of old asphalt pavement reclaimed materials, factory-mixed hot regeneration technology is the most common asphalt pavement regeneration method. The factory-mixed hot regeneration technology is to first transport the old asphalt pavement reclaimed materials obtained by milling asphalt concrete pavement back to the factory, and then crush and screen them. According to the indicators such as the old asphalt content, asphalt aging degree, and gravel grading in the recycled materials, a certain amount of new aggregate, new asphalt and regeneration agent are added for mixing, so that the performance of the mixture meets the various indicators required by the specifications. Finally, the road surface is repaved in the same way as the new asphalt concrete pavement. The factory-mixed hot regeneration technology belongs to structural regeneration and can be effectively used for the recycling and utilization of old asphalt concrete pavements under various conditions. It not only saves a large amount of raw materials such as asphalt, sand and gravel, saves project investment, and avoids new resource consumption, but also is conducive to the treatment of waste materials and protection of the environment, thus having significant economic, social and environmental benefits.

[0005] The recycling of aged asphalt from recycled materials in old asphalt pavements is key to the aforementioned plant-mix hot regeneration technology. Restoring the performance of aged asphalt primarily involves adjusting the chemical composition ratio and colloidal structure of the aged asphalt through the addition of regeneration agents to improve its performance. Currently, regeneration agents on the market are primarily based on waste motor oil, hydraulic oil, tung oil, rubber oil, and other materials. These agents present the following issues: unstable quality, and the asphalt's performance indicators after regeneration are not significantly restored, as evidenced by a small increase in penetration, minimal change in ductility after the addition of the regeneration agent, and a significant decrease in softening point. These post-regeneration asphalt indicators demonstrate that the regeneration agents currently available on the market, based primarily on waste motor oil, have a poor effect on improving the low-temperature elongation properties of aged asphalt. Furthermore, the regenerated asphalt exhibits poor high-temperature heat resistance.

[0006] For example, Chinese patent application publication number CN109337392A discloses an asphalt regeneration agent and its preparation method. The disclosed asphalt regeneration agent is prepared by adding 20-30 parts of aromatic light oil and 20-30 parts of plasticizer to 45-55 parts of waste engine oil as a base oil. The aromatic light oil is furfural-extracted oil, and the plasticizer comprises component A and component B. Component A comprises an epoxy resin, a diluent, and a polyurethane prepolymer, while component B comprises an imidazole curing agent, an alicyclic amino curing agent, a toughening agent, and a coupling agent. This patent CN109337392A suffers from the following problems: 1. The asphalt regeneration agent uses waste engine oil as the base oil, which has the problem of poor long-term stability and poor improvement effect on needle penetration and ductility.

[0007] 2. The invention enhances the viscosity, ductility, and strength of the base oil and aromatic light oil in the asphalt regeneration agent by adding plasticizers, including components A and B. This requires strict control of the ratio of the plasticizer components to ensure that the mixture maintains a moderate viscosity, ductility, and strength when the asphalt regeneration agent is used. This ensures that the mixture exhibits both appropriate viscosity and ductility, a uniform blend with both new and old aggregates, and suitable strength and high-temperature heat resistance. However, the high plasticizer content and ratio of the raw materials, coupled with the difficulty in controlling the components of waste engine oil, make the asphalt regeneration agent disclosed in this patent difficult to control in actual use, resulting in poor high-temperature heat resistance of the regenerated asphalt pavement.

[0008] 3. The asphalt regeneration agent provided by this patent suffers from poor uniformity in the mixed mixture when used for asphalt regeneration. This is manifested in that, during application testing of the asphalt regeneration agent provided by this patent, the inventors found that the interpenetration and fusion between the asphalt regeneration agent and aged asphalt was generally insufficient, which easily resulted in uneven asphalt coating of the new and old aggregates in the mixed recycled mixture. Specifically, this was manifested in a thin asphalt film on the new aggregate and a thick asphalt film on the old aggregate. Furthermore, larger-sized new aggregates were still not fully coated with asphalt after mixing, resulting in a whitening phenomenon. Summary of the Invention

[0009] When existing asphalt regeneration agents are mixed with new aggregates and recycled materials from old asphalt pavements to regenerate aged asphalt, there are problems of uneven mixing and poor high-temperature heat resistance of the regenerated asphalt mixture. In order to solve the above technical problems, the present invention provides a high-efficiency asphalt regeneration agent, a preparation method and application thereof.

[0010] The specific technical solutions of the present invention are: In a first aspect, the present invention provides a high-efficiency asphalt regeneration agent comprising the following components: Furfural extracted oil, heavy traffic road petroleum asphalt, liquid coumarone resin, oxidized polyethylene wax, adhesion regulator, kerosene; The adhesion modifier is an inorganic or organic substance that can release hydroxide ions in the high-efficiency asphalt rejuvenator. The adhesion modifier improves the adhesion performance of the high-efficiency asphalt rejuvenator to aged asphalt by providing hydroxide ions to the high-efficiency asphalt rejuvenator.

[0011] Existing asphalt regeneration agents, when mixed with new aggregate and recycled asphalt pavement materials to recycle aged asphalt, suffer from uneven mixing and poor high-temperature heat resistance in the regenerated asphalt mixture. For example, in prior art application publication number CN109337392A, the plasticizer used to adjust the viscosity, ductility, and strength of the base oil is ineffective. This can easily lead to uneven mixing of the asphalt regeneration agent with the mixture during use, and the regenerated asphalt mixture also suffers from poor high-temperature heat resistance.

[0012] To address the aforementioned issues, the present invention utilizes furfural-extracted oil as the base oil for an asphalt rejuvenator. Heavy-duty road petroleum asphalt, liquid coumarone resin, oxidized polyethylene wax, an adhesion modifier capable of providing hydroxide ions to the high-efficiency asphalt rejuvenator, and kerosene are added. Through the synergistic combination of these components, a high-efficiency asphalt rejuvenator is formed. This high-efficiency asphalt rejuvenator exhibits a strong ability to reactivate and restore the properties of aged asphalt, significantly restoring its fluidity, viscosity, and elasticity while also enhancing its high-temperature performance. More specifically, this high-efficiency asphalt rejuvenator improves the adhesion between the regenerated asphalt and aggregate, resulting in improved and substantially uniform adhesion between the regenerated asphalt and both new and old aggregates, mitigating the occurrence of whitening, and enhancing mixing efficiency, enabling asphalt pavements prepared from the regenerated asphalt to meet the technical requirements of fresh asphalt.

[0013] The present invention uses furfural-extracted oil, which has a similar polarity to the asphaltene in aged asphalt, as a base oil, enabling rapid mixing when mixed with aged asphalt. However, because furfural-extracted oil contains trace amounts of acidic substances, and aged asphalt produces a large amount of acidic compounds such as carboxylic acids and sulfoxides due to oxidation, making it acidic, furfural-extracted oil has poor adhesion to acidic aged asphalt and siliceous aggregate, which can easily lead to water damage in the mixture, aggregate delamination, and potholes in the road surface. Therefore, the present invention utilizes the synergistic combination of the following components to enhance the adhesion of the asphalt regeneration agent to the aggregate and improve mixing efficiency: First, the adhesion modifier provides hydroxide ions to the high-efficiency asphalt regeneration agent. During the preparation of the asphalt regeneration agent, other acidic components in the agent, such as trace acidic substances in furfural-extracted oil, are neutralized, rendering the asphalt regeneration agent alkaline. Furthermore, in the alkaline asphalt regeneration agent, the hydroxide ions readily bind to oxides on the surface of aged asphalt, such as carboxylic acids, through ionic bonds. Driven by the strong force of the ionic bonds, the asphalt regeneration agent adheres to the surfaces of aged asphalt and used aggregate in the recycled asphalt pavement material. The present invention utilizes the alkaline state to enhance adhesion to the aged asphalt and used aggregate in the recycled asphalt pavement material, thereby improving mixing efficiency.

[0014] Neutralizing acidic substances can prevent side reactions such as esterification and polymerization during the storage or construction of the regeneration agent, ensure the compatibility of the components, and avoid the failure of liquid coumarone resin due to the acidic environment.

[0015] Second, the kerosene quickly penetrates the aged asphalt, softening it and accelerating the fusion between the furfural-extracted oil and the aged asphalt, thereby catalyzing their adhesion. The kerosene exhibits excellent penetration within the high-efficiency asphalt regeneration agent provided by the present invention. This penetration catalyzes the adhesion of the asphalt regeneration agent to the aged asphalt and old aggregate in the recycled asphalt pavement material, enhancing the mixing effect.

[0016] Third, by adding liquid coumarone resin, it plays the role of plasticizer and connector in the high-efficiency asphalt regeneration agent. Since it has good compatibility with heavy traffic road petroleum asphalt, furfural extracted oil, kerosene and aged asphalt, it can achieve good connection between the various components in the high-efficiency asphalt regeneration agent and good connection between the various components in the high-efficiency asphalt regeneration agent and the aged asphalt in the old asphalt pavement recycling material, thereby strengthening the fusion of the asphalt regeneration agent and the old asphalt pavement recycling material and improving the water damage resistance of the recycled asphalt mixture.

[0017] Fourthly, the oxidized polyethylene wax, more specifically through its molecular structure's internal and external lubrication properties, can reduce internal friction between asphalt molecules, thereby achieving better fusion between the mixed molecules. The addition of oxidized polyethylene wax can effectively improve the high-temperature stability of recycled asphalt mixtures, resolving the sudden drop in rutting resistance caused by the addition of traditional regeneration agents.

[0018] In the high-efficiency asphalt regeneration agent provided by the present invention, when mixed with aged asphalt, the flow resistance of the mixture during the construction process is relatively small, which can greatly improve the compaction characteristics of the regenerated asphalt mixture, thereby improving the water damage resistance of the regenerated asphalt mixture.

[0019] As a preferred embodiment of the above-mentioned high-efficiency asphalt regeneration agent, the adhesion regulator is potassium hydroxide and / or sodium hydroxide.

[0020] The adhesion regulator can quickly neutralize the acid anhydride in the asphalt and other acidic substances in the composite high-efficiency regeneration agent by providing hydroxide ions to the high-efficiency asphalt regeneration agent, turning the acidic regeneration agent into alkaline. The alkaline environment is more conducive to the asphalt regeneration agent to combine with aged asphalt and aggregate through ionic bonds, thereby significantly improving the adhesion between the regenerated asphalt and the aggregate, and improving the water damage resistance of the regenerated asphalt mixture.

[0021] More importantly, the adhesion regulator is potassium hydroxide and / or sodium hydroxide. The potassium salt and sodium salt R-COONa of R-COOK generated by neutralization reaction have surface activity, which can reduce the interfacial tension of the asphalt-aggregate interface and enhance the asphalt's wrapping of the aggregate.

[0022] Preferably, the potassium hydroxide has an alkalinity of not less than 95%, a moisture content of not more than 1%, a chloride content of not more than 0.01%, a sulfate content of not more than 0.02%, and a maximum particle size of not more than 5 μm.

[0023] In the present invention, the furfural extracted oil preferably has: an aromatic hydrocarbon content of not less than 90%, a flash point of not less than 200°C, an asphaltene content of 0, and a kinematic viscosity (100°C) of 6-8 mm 2 / s. ‌ The oxidized polyethylene wax preferably has a softening point of not less than 100° C. and an average molecular weight of 3000 to 5000.

[0024] The model of the heavy traffic road petroleum asphalt is one of AH-130# and AH-110#, and its quality meets the requirements of the "Highway Asphalt Pavement Construction Specification" (JTG F40-2004).

[0025] The liquid coumarone resin preferably has a softening point of 5-25° C., a volatile matter content of no more than 6%, and an ash content of no more than 1%.

[0026] The kerosene is preferably odorless kerosene. According to the actual operation requirements, the sulfur content of the odorless kerosene is not more than 0.003%, and the kinematic viscosity (40°C) is 1~3mm 2 / s, pour point not greater than -10℃, flash point not less than 100℃.

[0027] As a preferred embodiment of the above-mentioned high-efficiency asphalt regeneration agent, the high-efficiency asphalt regeneration agent includes the following components in parts by weight: 35-45 parts of furfural extracted oil, 15-25 parts of heavy traffic road petroleum asphalt, 5-10 parts of liquid coumarone resin, 10-15 parts of oxidized polyethylene wax, 10-15 parts of adhesion regulator, and 4-8 parts of kerosene.

[0028] As a preferred embodiment of the above-mentioned high-efficiency asphalt regeneration agent, the high-efficiency asphalt regeneration agent further comprises the following components in parts by weight: 1 to 2 parts of asphalt deodorizer.

[0029] Asphalt odor purifier changes the structure of waste gas pollution odor molecules in the production of regeneration agent, recycled mixture and construction process through reactions such as absorption, complexation, substitution, replacement and oxidation, turning them into non-toxic and odorless molecules, thereby improving the construction conditions of recycled mixture.

[0030] Preferably, the asphalt deodorizer has a melting point of 50-70°C, a flash point of not less than 300°C, and a density of 1.1-1.3 g / cm 3 .

[0031] In a second aspect, the present invention provides a method for preparing a high-efficiency asphalt regeneration agent, which comprises step S1: Step S1: At 130-150°C, perform the following operations: The heavy traffic road petroleum asphalt is mixed with furfural extracted oil, oxidized polyethylene wax, liquid coumarone resin, kerosene and adhesion regulator to obtain a high-efficiency asphalt regeneration agent.

[0032] The preparation method of the present invention uses a formula containing furfural extracted oil, heavy traffic road petroleum asphalt, liquid coumarone resin, oxidized polyethylene wax, an adhesion regulator, and kerosene. It does not need to be carried out under high temperature conditions, thus avoiding secondary aging of the regenerated asphalt.

[0033] As a preferred embodiment of the above preparation method, step S1 is carried out step by step, as follows: (1) mixing heavy traffic road petroleum asphalt and oxidized polyethylene wax to obtain a mixture 1; (2) Add furfural to the mixture to extract the oil, stir, and obtain the mixture 2; (3) adding liquid coumarone resin to the mixture 2 and stirring to obtain the mixture 3; (4) Add kerosene to mixture 3 and stir to obtain mixture 4; (5) Adding an adhesion regulator to the mixture 4 and subjecting it to high-speed shearing to obtain the mixture 5, i.e., the high-efficiency asphalt regeneration agent.

[0034] As a preferred embodiment of the above preparation method, the stirring speed is 200-500 rpm, and the high-speed shearing speed is 8000-15000 rpm.

[0035] As a preferred method of the above preparation method, heavy traffic road petroleum asphalt is mixed with furfural extracted oil, oxidized polyethylene wax, liquid coumarone resin, kerosene, and adhesion regulator according to the following parts by weight: 35-45 parts of furfural extracted oil, 15-25 parts of heavy traffic road petroleum asphalt, 5-10 parts of liquid coumarone resin, 10-15 parts of oxidized polyethylene wax, 10-15 parts of adhesion regulator, and 4-8 parts of kerosene.

[0036] As a preferred embodiment of the above preparation method, the following step S2 is further included: Step S2: Lower the temperature to 100-110°C and perform the following operations: Add asphalt deodorizer to the mixture obtained in step S1.

[0037] In a third aspect, based on the high-efficiency asphalt regeneration agent provided above and the high-efficiency asphalt regeneration agent prepared by the above-mentioned preparation method, the present invention provides an application of a high-efficiency asphalt regeneration agent in asphalt regeneration.

[0038] Specifically, generally, the application method is to add the above-mentioned high-efficiency asphalt regeneration agent in an amount of 5%-10% of the total weight of the aged asphalt according to the performance of the aged asphalt in the recycled material of the old asphalt pavement to prepare regenerated asphalt, and then add a certain amount of new aggregate and new asphalt to the regenerated asphalt according to the performance requirements of the pavement to prepare the asphalt pavement.

[0039] Experimental verification shows that the performance of the regenerated asphalt obtained by regenerating aged asphalt from recycled old asphalt pavement materials using the asphalt regeneration agent provided by the present invention meets the technical requirements for fresh asphalt in the "Technical Specifications for Highway Asphalt Pavement Construction" (JTG F40-2004).

[0040] Compared with the prior art, the present invention has the following technical effects: 1. The present invention utilizes furfural-extracted oil as the base oil for an asphalt rejuvenator. Heavy-duty road petroleum asphalt, liquid coumarone resin, oxidized polyethylene wax, an adhesion modifier capable of providing hydroxide ions to the high-efficiency asphalt rejuvenator, and kerosene are added. These components are combined in a multi-component, synergistic manner to form a high-efficiency asphalt rejuvenator. This high-efficiency asphalt rejuvenator exhibits a strong ability to activate and restore the properties of aged asphalt, significantly restoring its fluidity, viscosity, and elasticity while also enhancing its high-temperature performance. More specifically, this high-efficiency asphalt rejuvenator enhances the adhesion between the regenerated asphalt and aggregate, resulting in improved and substantially uniform adhesion between the regenerated asphalt and both new and old aggregates. This mitigates the occurrence of whitening and improves mixing efficiency, enabling asphalt pavements prepared from the regenerated asphalt to meet the technical requirements of fresh asphalt.

[0041] 2. The present invention uses furfural extracted oil with a polarity similar to that of asphaltene in aged asphalt as the base oil, which can achieve rapid mixing when mixed with aged asphalt. However, since furfural extracted oil contains trace amounts of acidic substances, it has poor adhesion to acidic aged asphalt and siliceous aggregates, which can easily lead to aggregate peeling in the mixture and potholes on the road surface. Therefore, the present invention uses the following components to cooperate with each other to improve the adhesion of the asphalt regeneration agent to the aggregate and improve the mixing effect: First, the adhesion regulator provides hydroxide ions to the high-efficiency asphalt regeneration agent, and in the preparation stage of the asphalt regeneration agent, it neutralizes other acidic components in the regeneration agent, making the asphalt regeneration agent alkaline. Then, driven by the strong ionic bond force of the hydroxide ions and oxides such as carboxylic acids on the surface of the aged asphalt, the asphalt regeneration agent is driven to adhere to the surface of the aged asphalt and old aggregate in the recycled old asphalt pavement; second, through the penetration of kerosene, the adhesion of the asphalt regeneration agent to the aged asphalt and old aggregate in the recycled old asphalt pavement is catalyzed. The invention discloses a novel method for the regeneration of asphalt by mixing liquid coumarone resin, which has good compatibility with heavy traffic road petroleum asphalt, furfural extracted oil, kerosene and aged asphalt, and can realize good connection of each component in the high-efficiency asphalt regeneration agent and good connection of each component in the high-efficiency asphalt regeneration agent with aged asphalt in the old asphalt pavement recycling material, thereby strengthening the fusion of the asphalt regeneration agent and the old asphalt pavement recycling material, and improving the water damage resistance of the regenerated asphalt mixture; fourthly, through the internal and external lubricating properties of the oxidized polyethylene wax, the internal friction between the asphalt molecules is reduced, thereby achieving a better fusion effect between the mixed molecules, and effectively improving the high-temperature stability of the regenerated asphalt mixture. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the following embodiments. Those skilled in the art will be able to implement the present invention based on these descriptions. Furthermore, the embodiments of the present invention described below are generally only a portion of the embodiments of the present invention, rather than all of the embodiments. Therefore, all other embodiments derived by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0043] Example 1 Step S1. First, this embodiment provides a composite high-efficiency asphalt regeneration agent, whose formula is: comprising the following raw materials in parts by mass: 45 parts of furfural extracted oil, 10 parts of oxidized polyethylene wax, 15 parts of heavy traffic road petroleum asphalt, 5 parts of liquid coumarone resin, 8 parts of odorless kerosene, 15 parts of potassium hydroxide, and 2 parts of asphalt deodorizer.

[0044] The relevant performance parameters of each component in the above raw materials are as follows: The furfural extracted oil has an aromatic hydrocarbon content of 92%, a flash point of 210°C, an asphaltene content of 0, and a kinematic viscosity (100°C) of 8 mm 2 / s; the softening point of the oxidized polyethylene wax is 105°C and the average molecular weight is 5000; the model of the heavy traffic road petroleum asphalt is AH-130#, and its quality meets the requirements of the "Highway Asphalt Pavement Construction Specification" (JTG F40-2004); the softening point of the liquid coumarone resin is 25°C, the volatile matter content is 1.2%, and the ash content is 0.2%; the sulfur content of the odorless kerosene is 0.001%, and the kinematic viscosity (40°C) is 3mm 2 / s, pour point of -14 ° C, flash point of 109 ° C; the alkalinity of the potassium hydroxide is 95%, the moisture content is 0.45%, the chloride content is 0.002%, the sulfate content is 0.01%, and the maximum particle size is 5 μm; the asphalt deodorizer is produced by Fojiao Ketiannuo (Zhenjiang) Materials Co., Ltd., and the melting point of the asphalt deodorizer is 70 ° C, the flash point is 300 ° C, and the density is 1.3 g / cm 3 .

[0045] Step S2: providing a method for preparing the composite high-efficiency asphalt regeneration agent, comprising the following steps: Step 1: Prepare the raw materials by weighing according to the ratio in the formula, and adjust the temperature in the stirred reactor to 130°C; Step 2: Add heavy traffic road petroleum asphalt heated to 130° C. into a stirred reactor, then add oxidized polyethylene wax, maintain the temperature in the stirred reactor constant, and force stirring for 20 minutes; Step 3: Add the weighed furfural extracted oil to the product obtained in step 2, maintain the temperature unchanged, and force stir for 10 minutes; Step 4: Add the weighed liquid coumarone resin to the product obtained in step 3, maintain the temperature unchanged, and force stir for 10 minutes; Step 5: Add the weighed odorless kerosene to the product obtained in step 4, maintain the temperature unchanged, and force stir for 5 minutes; Step 6: Add the weighed potassium hydroxide to the product obtained in step 5, maintain the temperature unchanged, and force stir for 10 minutes; Step 7: Shear the product obtained in step 6 for 45 minutes using a high-speed shearing machine while maintaining the temperature constant; Step 8: Lower the temperature of the product obtained in step 7 to 110° C., add the weighed asphalt deodorizer, and force stir for 5 minutes to obtain a composite high-efficiency asphalt regeneration agent.

[0046] In the above preparation method, the speed of the forced stirring is 400 rpm, and the speed of the shearing is 10000 rpm.

[0047] Step S3: providing the application of the above-mentioned composite high-efficiency asphalt regeneration agent: Project Overview: Recycled asphalt AC-20, from the lower layer of the original pavement on a national highway in Jiangsu Province, was recovered. The old asphalt was SBS-modified. Laboratory testing revealed a needle penetration of 22 (0.1 mm) (25°C, 100 g, 5 seconds), a softening point of 85°C, and a ductility of 10 cm (5°C, 5 cm / min) compared to fresh asphalt. Compared to fresh asphalt, the penetration and ductility decreased, while the softening point increased. The asphalt was severely aged, requiring restoration to meet the ID requirements for fresh SBS-modified asphalt as specified in the "Technical Specification for Highway Asphalt Pavement Construction" (JTG F40-2004).

[0048] The application method of the composite high-efficiency asphalt rejuvenator is as follows: Based on the properties of aged asphalt in recycled AC-20 asphalt pavement, the composite high-efficiency asphalt rejuvenator is added at a dosage of 5% of the total weight of the aged asphalt to produce regenerated asphalt. The test results are shown in Table 1. Table 1 shows that the regenerated asphalt meets the technical requirements for fresh asphalt in the "Technical Specification for Highway Asphalt Pavement Construction" (JTG F40-2004).

[0049] Table 1 Example 2 Step S1. This embodiment provides a composite high-efficiency asphalt regeneration agent, which has a formula: comprising the following raw materials in parts by mass: 35 parts of furfural extracted oil, 15 parts of oxidized polyethylene wax, 25 parts of heavy traffic road petroleum asphalt, 9 parts of liquid coumarone resin, 5 parts of odorless kerosene, 10 parts of potassium hydroxide, and 1 part of asphalt deodorizer.

[0050] Step S2: Provide a preparation method for the composite high-efficiency asphalt regeneration agent, the steps and operations of which are the same as step S2 of Example 1.

[0051] Step S3: providing the application of the above-mentioned composite high-efficiency asphalt regeneration agent: Project Overview: SMA-13 recycled asphalt was recovered from the top layer of an existing highway in Zhejiang Province. The old asphalt was SBS-modified asphalt. Laboratory testing revealed a needle penetration of 28 (0.1 mm) (25°C, 100 g, 5 seconds), a softening point of 80°C, an ductility of 13 cm (5°C, 5 cm / min), and an elastic recovery of 52% (25°C). Compared to fresh asphalt, the needle penetration and ductility were lower, the elastic recovery was worse, and the softening point was higher. The asphalt was severely aged, requiring restoration to meet the technical requirements for fresh SBS-modified asphalt IC as specified in the "Technical Specification for Highway Asphalt Pavement Construction" (JTG F40-2004).

[0052] The application method is basically the same as step S3 of Example 1, except that the composite high-efficiency asphalt regeneration agent is added in an amount of 10% of the total weight of the aged asphalt.

[0053] The test results of this embodiment are shown in Table 2. Table 2 shows that the recycled asphalt meets the technical requirements of fresh asphalt in the "Technical Specifications for Highway Asphalt Pavement Construction" (JTG F40-2004).

[0054] Table 2 Example 3 Step S1. This embodiment provides a composite high-efficiency asphalt regeneration agent, which has a formula: comprising the following raw materials in parts by mass: 41 parts of furfural extracted oil, 12 parts of oxidized polyethylene wax, 20 parts of heavy traffic road petroleum asphalt, 10 parts of liquid coumarone resin, 4 parts of odorless kerosene, 11.5 parts of potassium hydroxide, and 1.5 parts of asphalt deodorizer.

[0055] Step S2: Provide a preparation method for the composite high-efficiency asphalt regeneration agent, the steps and operations of which are the same as step S2 of Example 1.

[0056] Step S3: providing the application of the above-mentioned composite high-efficiency asphalt regeneration agent: Project Overview: Recycled asphalt AC-13, the top layer of the original pavement, was recovered from a rural highway in Zhejiang Province. The recycled asphalt was heavy-duty petroleum asphalt. Laboratory testing revealed a needle penetration of 33 (0.1mm) (25°C, 100g, 5s), a softening point of 58°C, and an ductility of 11.6cm (10°C, 5cm / min) compared to fresh asphalt. Compared to fresh asphalt, the penetration and ductility decreased, while the softening point increased. The asphalt was severely aged and required restoration to meet the technical requirements for fresh heavy-duty petroleum asphalt AH-70#, as specified in the "Technical Specification for Highway Asphalt Pavement Construction" (JTG F40-2004).

[0057] The application method is basically the same as step S3 of Example 1, except that the composite high-efficiency asphalt regeneration agent is added in an amount of 6.8% of the total weight of the aged asphalt.

[0058] The test results of this embodiment are shown in Table 3. Table 3 shows that the recycled asphalt meets the technical requirements of fresh asphalt in the "Technical Specifications for Highway Asphalt Pavement Construction" (JTG F40-2004).

[0059] Table 3 Comparative Example 1 A composite asphalt regeneration agent is provided, the formula of which differs from that of Example 1 in that potassium hydroxide is not added. The preparation method and application method are the same as those of Example 1.

[0060] The formula of the composite asphalt regeneration agent of this comparative example is: calculated by mass, the formula components are: 45 parts of furfural extracted oil, 10 parts of oxidized polyethylene wax, 15 parts of heavy traffic road petroleum asphalt, 5 parts of liquid coumarone resin, 8 parts of odorless kerosene, 15 parts of potassium hydroxide, and 2 parts of asphalt deodorizer.

[0061] The test results of this comparative example are shown in Table 4. The higher the softening point, the stronger the asphalt's ability to resist deformation at high temperatures, that is, the better its anti-rutting ability. The viscosity at 135°C reflects the asphalt's flow properties at construction temperature; the lower the viscosity at 135°C, the better the construction and workability. As shown in Table 4, the viscosity of the recycled asphalt obtained in this comparative example at 135° C. does not meet the technical requirements for fresh asphalt in the Technical Specifications for Highway Asphalt Pavement Construction (JTG F40-2004).

[0062] Table 4 Comparative Example 2 A composite asphalt regeneration agent is provided, the formula of which differs from that of Example 1 in that odorless kerosene is not added. The preparation method and application method are the same as those of Example 1.

[0063] The formula of the composite asphalt regeneration agent of this comparative example is: calculated by mass, the formula components are: 45 parts of furfural extracted oil, 10 parts of oxidized polyethylene wax, 15 parts of heavy traffic road petroleum asphalt, 5 parts of liquid coumarone resin, 15 parts of potassium hydroxide, and 2 parts of asphalt deodorizer.

[0064] The test results of this comparative example are shown in Table 5. As shown in Table 5, the viscosity of the recycled asphalt obtained in this comparative example at 135° C. does not meet the technical requirements for fresh asphalt in the Technical Specifications for Highway Asphalt Pavement Construction (JTG F40-2004).

[0065] Table 5 Comparative Example 3 A composite asphalt rejuvenating agent is provided, the formula of which differs from that of Example 1 in that no liquid coumarone resin is added. The preparation method and application method are the same as those of Example 1.

[0066] The formula of the composite asphalt regeneration agent of this comparative example is: calculated by mass, the formula components are: 45 parts of furfural extracted oil, 10 parts of oxidized polyethylene wax, 15 parts of heavy traffic road petroleum asphalt, 8 parts of odorless kerosene, 15 parts of potassium hydroxide, and 2 parts of asphalt deodorizer.

[0067] The test results of this comparative example are shown in Table 6. Table 6 shows that compared with Example 1, the penetration of the regenerated asphalt obtained in this comparative example increased slightly, the ductility improved less significantly after application of the regeneration agent, and the softening point decreased significantly. This comparative example does not meet the technical requirements for fresh asphalt in the "Technical Specification for Highway Asphalt Pavement Construction" (JTG F40-2004).

[0068] Table 6 Comparative Example 5 A composite asphalt rejuvenator is provided, the formula of which differs from that of Example 1 in that 13 parts by weight of liquid coumarone resin are added. The preparation method and application method are the same as those of Example 1.

[0069] The formula of the composite asphalt regeneration agent of this comparative example is: calculated by mass, the formula components are: 45 parts of furfural extracted oil, 10 parts of oxidized polyethylene wax, 15 parts of heavy traffic road petroleum asphalt, 13 parts of liquid coumarone resin, 8 parts of odorless kerosene, 15 parts of potassium hydroxide, and 2 parts of asphalt deodorizer.

[0070] The test results of this comparative example are shown in Table 7. As shown in Table 7, the viscosity of the recycled asphalt obtained in this comparative example at 135° C. does not meet the technical requirements for fresh asphalt in the Technical Specifications for Highway Asphalt Pavement Construction (JTG F40-2004).

[0071] Table 7 As shown by the analysis of Examples 1 to 3, the present invention utilizes furfural-extracted oil as the base oil for the asphalt rejuvenator, and incorporates heavy-duty road petroleum asphalt, liquid coumarone resin, oxidized polyethylene wax, an adhesion modifier capable of providing hydroxide ions for the high-efficiency asphalt rejuvenator, and kerosene. Through the synergistic combination of these components, a high-efficiency asphalt rejuvenator is formed. This high-efficiency asphalt rejuvenator exhibits a strong ability to reactivate and restore the properties of aged asphalt, significantly restoring its fluidity, viscosity, and elasticity while also enhancing its high-temperature performance. More specifically, this high-efficiency asphalt rejuvenator improves the adhesion between the regenerated asphalt and aggregate, resulting in excellent and substantially consistent adhesion between the regenerated asphalt and both new and old aggregates, mitigating the occurrence of whitening, and enhancing mixing efficiency, ensuring that the regenerated asphalt meets the technical requirements of fresh asphalt as specified in the "Technical Specification for Highway Asphalt Pavement Construction" (JTGF40-2004).

[0072] Comparative analysis of Comparative Examples 1 to 5 demonstrates that the asphalt regeneration agent provided by the present invention, which uses furfural-extracted oil as a base oil component and is added to heavy-duty road petroleum asphalt, liquid coumarone resin, oxidized polyethylene wax, an adhesion modifier, and kerosene, exhibits a synergistic effect among the components. This is specifically reflected in: First, the adhesion regulator potassium hydroxide provides hydroxide ions to the high-efficiency asphalt regeneration agent, neutralizing other acidic components in the asphalt regeneration agent during the preparation of the asphalt regeneration agent, making the asphalt regeneration agent alkaline. Furthermore, driven by the strong ionic bond force between the hydroxide ions and oxides such as carboxylic acids on the surface of the aged asphalt, the asphalt regeneration agent adheres to the surface of the aged asphalt and old aggregate in the recycled old asphalt pavement material. For example, in Comparative Example 1, in which potassium hydroxide is not added, the application effect of the regeneration agent is poor, and the viscosity of the regenerated asphalt at 135°C increases significantly. Second, the penetration of kerosene catalyzes the adhesion of the asphalt regeneration agent to the aged asphalt and old aggregate in the recycled old asphalt pavement, thereby improving the mixing effect. For example, in Comparative Example 2, where kerosene was not added, the application effect of the regeneration agent deteriorated, and the performance of the regenerated asphalt deteriorated. Third, by adding liquid coumarone resin, due to its good compatibility with heavy traffic road petroleum asphalt, furfural extracted oil, kerosene and aged asphalt, it is possible to achieve good connection between the various components in the high-efficiency asphalt regeneration agent and good connection between the various components in the high-efficiency asphalt regeneration agent and the aged asphalt in the old asphalt pavement recycling material, thereby strengthening the fusion of the asphalt regeneration agent and the old asphalt pavement recycling material, and improving the water damage resistance of the regenerated asphalt mixture; for example, comparative examples 3 to 4 did not add liquid coumarone resin and added 13 parts of liquid coumarone resin respectively. The needle penetration of the regenerated asphalt obtained in comparative examples 3 and 4 increased slightly, the ductility was poorly improved after the application of the regeneration agent, the softening point decreased significantly, and the performance of the regenerated asphalt was poor.

[0073] Therefore, through comparative analysis of the above embodiments and comparative examples, it can be seen that the present invention uses furfural extracted oil as the base oil component of the asphalt regeneration agent, and the added heavy traffic road petroleum asphalt, liquid coumarone resin, oxidized polyethylene wax, an adhesion regulator that can provide hydroxide ions for the high-efficiency asphalt regeneration agent, and kerosene have a synergistic effect among the multiple components, and through the synergistic cooperation, a high-efficiency asphalt regeneration agent is formed.

[0074] Unless otherwise specified, the raw materials and equipment used in the present invention are commonly used in the art; the methods used in the present invention are conventional methods in the art unless otherwise specified.

[0075] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A high-efficiency asphalt regeneration agent, characterized by: Includes the following components: Furfural extracted oil, heavy traffic road petroleum asphalt, liquid coumarone resin, oxidized polyethylene wax, adhesion regulator, kerosene; Wherein, the adhesion regulator is an inorganic or organic substance that can release hydroxide ions in the high-efficiency asphalt regeneration agent.

2. The high-efficiency asphalt regeneration agent according to claim 1, characterized in that: The adhesion regulator is potassium hydroxide and / or sodium hydroxide.

3. A high-efficiency asphalt regeneration agent according to claim 1 or 2, characterized in that: The high-efficiency asphalt regeneration agent includes the following components by weight: 35-45 parts of furfural extracted oil, 15-25 parts of heavy traffic road petroleum asphalt, 5-10 parts of liquid coumarone resin, 10-15 parts of oxidized polyethylene wax, 10-15 parts of adhesion regulator, and 4-8 parts of kerosene.

4. The high-efficiency asphalt regeneration agent according to claim 3, characterized in that: The high-efficiency asphalt regeneration agent further comprises the following components by weight: 1 to 2 parts of asphalt deodorizer.

5. A method for preparing a high-efficiency asphalt regeneration agent, characterized by: The method comprises step S1: Step S1: At 130-150°C, perform the following operations: Heavy traffic road petroleum asphalt is mixed with furfural extracted oil, oxidized polyethylene wax, liquid coumarone resin, kerosene and adhesion regulator to obtain a high-efficiency asphalt regeneration agent.

6. The preparation method according to claim 5, wherein: The step S1 is performed step by step, as follows: (1) mixing heavy traffic road petroleum asphalt and oxidized polyethylene wax to obtain a mixture 1; (2) Add furfural to the mixture to extract the oil, stir, and obtain the mixture 2; (3) adding liquid coumarone resin to the mixture 2 and stirring to obtain the mixture 3; (4) Add kerosene to mixture 3 and stir to obtain mixture 4; (5) Adding an adhesion regulator to the mixture 4 and subjecting it to high-speed shearing to obtain the mixture 5, which is the high-efficiency asphalt regeneration agent.

7. The preparation method according to claim 6, wherein: The stirring speed is 200-500 rpm, and the high-speed shearing speed is 8000-15000 rpm.

8. The preparation method according to claim 5, wherein: Heavy traffic road petroleum asphalt is mixed with furfural extracted oil, oxidized polyethylene wax, liquid coumarone resin, kerosene, and adhesion regulator in the following parts by weight: 35-45 parts of furfural extracted oil, 15-25 parts of heavy traffic road petroleum asphalt, 5-10 parts of liquid coumarone resin, 10-15 parts of oxidized polyethylene wax, 10-15 parts of adhesion regulator, and 4-8 parts of kerosene.

9. The preparation method according to claim 5 or 7, wherein: The following step S2 is also included: Step S2: Lower the temperature to 100-110°C and perform the following operations: Add asphalt deodorizer to the mixture obtained in step S1.

10. Use of the high-efficiency asphalt regeneration agent according to any one of claims 1 to 4, or the high-efficiency asphalt regeneration agent prepared by the preparation method according to any one of claims 5 to 9 in asphalt regeneration.

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