Reactive asphalt regenerant, regenerated asphalt mixture and preparation method thereof
By using a regeneration agent composed of a reactive diluent and oil sulfide to blend the oil and colloid components of asphalt, the problem of poor fusion between the regeneration agent and RAP is solved, and the performance of aged asphalt is restored and the performance of the mixture is improved.
Patent Information
- Application Number
- CN202510634227.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-16
- Publication Date
- 2025-09-23
AI Technical Summary
Existing regeneration agents cannot effectively improve the performance of recycled asphalt, especially when the RAP dosage is high, the performance of the mixture cannot meet the use requirements, and the fusion effect of the regeneration agent and RAP is poor.
The regeneration agent composed of reactive diluent, oil extracted from the second line and oil sulfide is used to improve the fusion effect of the regeneration agent and RAP by blending the oil component and colloid component of asphalt and combining with alkaline compounds.
Effectively restore the performance of aged asphalt, so that the recycled asphalt mixture can meet the use requirements at high dosage, reduce the molding temperature and improve road performance.
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of road engineering materials, and in particular to a reactive asphalt regenerator, a regenerated asphalt mixture and a preparation method thereof. Background Art
[0002] With the continuous development of my country's economy and the expansion of highway construction, a large amount of recycled asphalt (RAP) is generated annually and urgently needs to be utilized. Recycling this waste and reducing resource waste has become a key social concern. Regarding the secondary utilization of RAP recycled asphalt waste, since RAP contains a high amount of aged asphalt, direct use can adversely affect the performance of the recycled asphalt mixture. Therefore, the addition of a regeneration agent is often necessary to restore the aged asphalt's properties. This is particularly important when the RAP utilization rate is high.
[0003] Existing regeneration agents are often based on the basic principle that after asphalt undergoes thermal and photooxidative aging, light oils and aromatic hydrocarbons evaporate, increasing asphalt viscosity, hardness, and ductility. More light oils are added to the regeneration agent to restore the asphalt's viscoelasticity. However, of the three major components of asphalt—oil, colloid, and asphaltene—less attention is paid to the colloid component. Furthermore, during the production of recycled asphalt mixtures, the regeneration agent is sprayed into the mixing bin along with the asphalt to mix with the RAP. Under mechanical stirring, the fusion effect of the regeneration agent and RAP is poor. Currently, the fusion effect of the regeneration agent and RAP is improved by adding a warm mix agent.
[0004] Therefore, there is an urgent need to provide a new type of asphalt regeneration agent to restore the performance of aged asphalt so that the performance of the recycled asphalt mixture, especially when the RAP content is high, can meet the use requirements. Summary of the Invention
[0005] In view of the above-mentioned deficiencies, the purpose of the present invention is to provide a reactive asphalt regeneration agent, a regenerated asphalt mixture and a preparation method thereof, so as to solve the technical problem that the existing asphalt regeneration agents cannot effectively improve the performance of regenerated asphalt.
[0006] To achieve the above object, the present invention is implemented through the following technical solutions: In a first aspect, the present invention provides a reactive asphalt regeneration agent, comprising a reactive diluent, oil extracted from a second-line reduction reactor, and oil sulfide; wherein the mass ratio of the reactive diluent, oil extracted from a second-line reduction reactor, and oil sulfide is 1: (0.1-0.3): (0.3-0.5); and the oil sulfide is a base oil component modified by a sulfiding agent.
[0007] Furthermore, the vulcanizing agent includes at least one of sulfur and dicumyl peroxide; and the base oil includes one or more of peanut oil, rapeseed oil, palm oil, and castor oil.
[0008] Furthermore, the vulcanizing agent includes sulfur and dicumyl peroxide in a mass ratio of 1:(0.1-0.3).
[0009] Furthermore, the preparation method of oil sulfide includes the following steps: drying the base oil and mixing it with a sulfiding agent to obtain a mixture; heating the mixture to a first preset temperature, keeping the temperature for a first preset time, and then continuing to heat the mixture to a second preset temperature and keeping the temperature for a second preset time, and after cooling, obtaining the oil sulfide.
[0010] Furthermore, the mass ratio of the base oil to the sulfiding agent is 100:(0.5~30).
[0011] Furthermore, the first preset temperature is 120-150° C., and the first preset time is 10-30 minutes; the second preset temperature is 160-180° C., and the second preset time is 1-2 hours.
[0012] Furthermore, the reactive diluent is tall oil acid.
[0013] In a second aspect, the present invention provides a regenerated asphalt mixture, comprising waste asphalt mixture, new asphalt, mineral powder, alkaline compounds and the reactive asphalt regeneration agent described in the first aspect; the waste asphalt mixture comprises natural mineral materials and waste asphalt concrete.
[0014] Furthermore, the mass ratio of waste asphalt mixture, new asphalt, mineral powder, alkaline compound and reactive asphalt regeneration agent is 100: (1.5~3.5): (1~4): (1~2): (0.15~0.35); in the waste asphalt mixture, the mass ratio of natural mineral material and waste asphalt concrete is 100: (10~70).
[0015] Furthermore, the natural mineral materials are one or more of limestone, basalt, and diabase; the waste asphalt concrete is obtained by milling and crushing old asphalt pavement, and the size is one or more of 0~5mm, 0~10mm, and 10~15mm; the new asphalt is any one of No. 70 road petroleum asphalt, No. 90 road petroleum asphalt, and polymer modified asphalt; the mineral powder is limestone mineral powder; and the alkaline compound is one or more of calcium oxide, magnesium oxide, calcium hydroxide, and calcium aluminate.
[0016] In a third aspect, the present invention provides a method for preparing the regenerated asphalt mixture as described in the second aspect, comprising the following steps: The natural mineral materials, waste asphalt concrete, new asphalt and reactive asphalt regeneration agent are preheated respectively; The preheated natural mineral material and waste asphalt concrete are mixed evenly to obtain waste asphalt mixture; The waste asphalt mixture, the new asphalt after preheating treatment, the reactive asphalt regeneration agent after preheating treatment, the mineral powder and the alkaline compound are uniformly mixed to obtain the regenerated asphalt mixture.
[0017] Furthermore, in the preheating treatment step, the preheating temperature of natural mineral materials is 180-200°C, the preheating temperature of waste asphalt concrete is 120-130°C, the preheating temperature of new asphalt is 150-165°C, and the preheating temperature of reactive asphalt regeneration agent is 120-165°C.
[0018] The beneficial effects of the present invention are: The present invention blends the oil components of asphalt through reactive diluents and second-line extraction oil, and blends the colloid components of asphalt through oil sulfides, thereby effectively restoring the performance of aged asphalt, so that the performance of the regenerated asphalt mixture, especially when the RAP content is high, can meet the use requirements. DETAILED DESCRIPTION
[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.
[0020] During asphalt use, due to thermal and photooxidative aging, asphalt molecules gradually grow larger, light oils and aromatic hydrocarbons volatilize, and asphalt viscosity increases, hardness increases, and ductility decreases, i.e., asphalt aging. If asphalt is divided into three components: asphaltenes, colloids, and oils, this results in an increase in asphaltene and a loss of colloids and oils. Therefore, in a first aspect, the present invention provides a reactive asphalt regeneration agent that blends the asphalt's oil component with a reactive diluent and oil extracted from a secondary line. Furthermore, oil sulfides are added to blend the asphalt's colloid component, thereby restoring the asphalt's properties.
[0021] Specifically, an embodiment of the present invention provides a reactive asphalt regeneration agent, including a reactive diluent, second-line extracted oil and oil sulfide; wherein the mass ratio of the reactive diluent, second-line extracted oil and oil sulfide is 1: (0.1~0.3): (0.3~0.5); the oil sulfide is a base oil component modified by a sulfiding agent.
[0022] In the embodiment of the present invention, the second-line extracted oil is a fraction collected from the second-line portion of the vacuum tower during the vacuum distillation of crude oil, and has an aromatic hydrocarbon content of 53.4% to 57.8% and a flash point of 203 to 213°C.
[0023] In some preferred embodiments, the method for preparing oil sulfide comprises the following steps: drying the base oil and mixing it with a sulfiding agent in a mass ratio of 100:(0.5-30) to obtain a mixture; heating the mixture to 120-150° C., keeping the temperature for 10-30 minutes, then continuing to heat the mixture to 160-180° C., keeping the temperature for 1-2 hours, and cooling the mixture to obtain oil sulfide.
[0024] In some preferred embodiments, the vulcanizing agent includes at least one of sulfur and dicumyl peroxide; the base oil includes one or more of peanut oil, rapeseed oil, palm oil, and castor oil; and the reactive diluent is tall oil acid.
[0025] The principle of the reactive asphalt regeneration agent provided by the present invention is as follows: (1) The reactive diluent and the oil extracted from the second-line asphalt are blended with the oil component of the asphalt, and the oil sulfide is blended with the colloid component of the asphalt, thereby restoring the performance of the aged asphalt in terms of composition. (2) As a colloid component, the oil sulfide has a good affinity for the oil component and asphalt, which can promote the fusion of the oil component and the asphalt; in addition, the reactive diluent can also dilute the asphalt well, so that the regenerated component can be fully fused during the mixing process, and can reduce the molding temperature of the regenerated asphalt mixture, achieving a warm mixing effect. (3) The reactive diluent can react chemically with the alkali, and the sulfiding agent added in the oil sulfidation can also undergo sulfide cross-linking with the aged asphalt and the regenerated component, so that the aged asphalt and the regenerated component are more tightly combined on the basis of full fusion, thereby improving the performance of the regenerated asphalt.
[0026] In a second aspect, an embodiment of the present invention provides a regenerated asphalt mixture, comprising waste asphalt mixture, new asphalt, mineral powder, alkaline compounds and the reactive asphalt regeneration agent described in the first aspect in a mass ratio of 100: (1.5~3.5): (1~4): (1~2): (0.15~0.35); wherein the waste asphalt mixture comprises natural mineral materials and waste asphalt concrete in a mass ratio of 100: (10~70).
[0027] In some preferred embodiments, the natural mineral material is one or more of limestone, basalt, and diabase; the waste asphalt concrete is obtained by milling and crushing old asphalt pavement, and the size is one or more of 0~5mm, 0~10mm, and 10~15mm; the new asphalt is any one of No. 70 road petroleum asphalt, No. 90 road petroleum asphalt, and polymer-modified asphalt; the mineral powder is limestone mineral powder; and the alkaline compound is one or more of calcium oxide, magnesium oxide, calcium hydroxide, and calcium aluminate.
[0028] In a third aspect, an embodiment of the present invention provides a method for preparing the regenerated asphalt mixture as described in the second aspect, comprising the following steps: Preheating natural mineral materials to 180-200°C, preheating waste asphalt concrete to 120-130°C, preheating new asphalt to 150-165°C, and preheating reactive asphalt regeneration agent to 120-165°C; uniformly mixing the preheated natural mineral materials and waste asphalt concrete to obtain waste asphalt mixture; uniformly mixing the waste asphalt mixture, preheated new asphalt, and preheated reactive asphalt regeneration agent with mineral powder and alkaline compounds to obtain regenerated asphalt mixture.
[0029] The present invention is further described in detail below through specific examples.
[0030] Example 1 1. Preparation of reactive asphalt regeneration agent (1) Preparation of oil sulfide: Peanut oil and rapeseed oil were mixed in a mass ratio of 1:1 to obtain a base oil. Sulfur and diisopropylbenzene peroxide were mixed in a mass ratio of 1:0.15 to obtain a sulfiding agent. The base oil was vacuum dried at 105°C for 1.5 h, and then mixed with the sulfiding agent in a mass ratio of 100:11 to obtain a mixture. The mixture was heated to 135°C, stirred with a high-speed shearing machine for 5 min, and kept warm for 10 min. The mixture was then heated to 165°C, stirred with a high-speed shearing machine for 10 min, and kept warm for 1.5 h. After the end of the heat preservation, it was cooled to room temperature to obtain oil sulfide.
[0031] (2) Preparation of a reactive asphalt regeneration agent: Tall oil acid as a reactive diluent was mixed with the oil extracted from the second-line reduction (aromatic hydrocarbon content of 55.6%, flash point of 205°C) and the sulfide of the oil obtained in step (1) in a mass ratio of 1:0.1:0.35, heated to 135°C, stirred for 10 minutes using a high-speed shearing machine, and cooled to room temperature to obtain a reactive asphalt regeneration agent.
[0032] 2. Preparation of recycled asphalt mixture 1) Preheat the materials separately. Specifically, the preheating temperature is 190°C for natural mineral aggregate, 130°C for waste asphalt concrete, 165°C for new asphalt, and 160°C for reactive asphalt regeneration agent. The mineral powder and alkaline compound are added at room temperature. The natural mineral aggregate is limestone, including sizes of 10-15mm, 5-10mm, and 3-5mm; the waste asphalt concrete is obtained by milling and crushing old asphalt pavement, with a size specification of 0-10mm; the new asphalt is ID polymer modified asphalt; the mineral powder is limestone mineral powder; the reactive asphalt regeneration agent is prepared in step (2); and the alkaline compound is a mixture of calcium oxide and calcium aluminate in a mass ratio of 1:1.
[0033] 2) Natural mineral aggregate and waste asphalt concrete were mixed in a mass ratio of 100:45 to obtain a waste asphalt mixture. The waste asphalt mixture, new asphalt, mineral powder, reactive asphalt regeneration agent and alkaline compound were then mixed and stirred in a mass ratio of 100:2.5:1.5:0.2:2 for 90 seconds to obtain a recycled asphalt mixture.
[0034] Example 2 1. Preparation of reactive asphalt regeneration agent (1) Preparation of oil sulfide: Palm oil and rapeseed oil were mixed in a mass ratio of 4:6 to obtain a base oil. Sulfur and diisopropylbenzene peroxide were mixed in a mass ratio of 1:0.2 to obtain a sulfiding agent. The base oil was vacuum dried at 105°C for 1.5 h, and then mixed with the sulfiding agent in a mass ratio of 100:5 to obtain a mixture; the mixture was heated to 150°C, stirred with a high-speed shearing machine for 10 min, and kept warm for 15 min. The mixture was then heated to 170°C, stirred with a high-speed shearing machine for 8 min, and kept warm for 1 h. After the end of the heat preservation, it was cooled to room temperature to obtain oil sulfide.
[0035] (2) Preparation of a reactive asphalt regeneration agent: Tall oil acid as a reactive diluent was mixed with the oil extracted from the second-line reduction (aromatic hydrocarbon content of 57.8%, flash point of 213°C) and the sulfide of the oil obtained in step (1) in a mass ratio of 1:0.2:0.4, heated to 140°C, stirred with a high-speed shearing machine for 5 minutes, and cooled to room temperature to obtain a reactive asphalt regeneration agent.
[0036] 2. Preparation of recycled asphalt mixture 1) Preheat the materials separately. Specifically, the preheating temperature is 190℃ for natural mineral materials, 125℃ for waste asphalt concrete, 155℃ for new asphalt, and 150℃ for reactive asphalt regeneration agent. The mineral powder and alkaline compound are added at room temperature. The natural mineral materials are a mixture of diabase and limestone. The diabase has a size of 10-15mm and 5-10mm, and the limestone has a size of 3-5mm. The waste asphalt concrete is obtained by milling and crushing old asphalt pavement. The size is 0-10mm and 10-15mm. The new asphalt is petroleum asphalt of Road No. 70. The mineral powder is limestone mineral powder. The reactive asphalt regeneration agent is prepared in step (2). The alkaline compound is a mixture of calcium hydroxide, magnesium oxide, and calcium aluminate in a mass ratio of 1:1:1.
[0037] 2) Natural mineral material and waste asphalt concrete were mixed in a mass ratio of 100:60 to obtain a waste asphalt mixture. The waste asphalt mixture, new asphalt, mineral powder, reactive asphalt regeneration agent and alkaline compound were then mixed and stirred in a mass ratio of 100:1.8:1:0.3:1.5 for 90 seconds to obtain a recycled asphalt mixture.
[0038] Example 3 1. Preparation of reactive asphalt regeneration agent (1) Preparation of oil sulfide: Castor oil, rapeseed oil, and peanut oil were mixed in a mass ratio of 1:1:2 to obtain a base oil. Sulfur and dicumyl peroxide were mixed in a mass ratio of 1:0.1 to obtain a sulfiding agent. The base oil was vacuum dried at 120°C for 1 h, and then mixed with the sulfiding agent in a mass ratio of 100:20 to obtain a mixture; the mixture was heated to 125°C, stirred with a high-speed shearing machine for 15 min, and kept warm for 25 min. The mixture was then heated to 160°C, stirred with a high-speed shearing machine for 15 min, and kept warm for 2 h. After the end of the heat preservation, it was cooled to room temperature to obtain oil sulfide.
[0039] (2) Preparation of a reactive asphalt regeneration agent: Tall oil acid as a reactive diluent was mixed with the oil extracted from the second-line reduction (aromatic hydrocarbon content of 53.4%, flash point of 203°C) and the sulfide of the oil obtained in step (1) in a mass ratio of 1:0.25:0.3, heated to 120°C, stirred for 15 minutes using a high-speed shearing machine, and cooled to room temperature to obtain a reactive asphalt regeneration agent.
[0040] 2. Preparation of recycled asphalt mixture 1) Preheat the materials separately. The preheating temperature of natural mineral material is 200℃, the preheating temperature of waste asphalt concrete is 120℃, the preheating temperature of new asphalt is 155℃, and the preheating temperature of reactive asphalt regeneration agent is 150℃. The mineral powder and alkaline compound are added at room temperature. The natural mineral material is basalt, and the sizes include 10-15mm, 5-10mm, and 3-5mm; the waste asphalt concrete is obtained by milling and crushing old asphalt pavement, and the sizes include 0-5mm and 5-10mm; the new asphalt is petroleum asphalt of Road No. 70; the mineral powder is limestone mineral powder; the reactive asphalt regeneration agent is prepared in step (2); and the alkaline compound is a mixture of calcium oxide and magnesium oxide in a mass ratio of 2:1.
[0041] 2) Natural mineral aggregate and waste asphalt concrete were mixed in a mass ratio of 100:35 to obtain a waste asphalt mixture. The waste asphalt mixture, new asphalt, mineral powder, reactive asphalt regeneration agent and alkaline compound were then mixed and stirred in a mass ratio of 100:3:2:0.15:1 for 60 seconds to obtain a recycled asphalt mixture.
[0042] Comparative Example 1 A regenerated asphalt mixture, the preparation method of which is basically the same as that of Example 1, except that the asphalt regeneration agent used is a common asphalt regeneration agent of model RA-25, and no alkaline compound is added.
[0043] Road performance testing The regenerated asphalt mixtures prepared in Example 1 and Comparative Example 1 were tested for road performance. Specifically, the regenerated asphalt mixtures were spread on the road surface using a paver. Water, equivalent to 1% of the mixture's mass, was sprayed onto the surface. The road surface was then compacted using a steel wheel roller and a tire roller until the compaction degree exceeded 97%. After the road surface cooled to room temperature, traffic was allowed to resume. The molding temperature for Example 1 was 140°C, while that for Comparative Example 1 was 165°C. The test results are shown in Table 1.
[0044] Table 1 Test results of road performance of recycled asphalt mixture
[0045] It can be seen from Table 1 that the regenerated asphalt mixture prepared by the present invention has more excellent road performance and, when the void ratio is similar, has a lower molding temperature.
[0046] In summary, the present invention comprehensively considers the issues of asphalt component blending, the fusion of the regeneration agent with new and old asphalt, and the provided reactive asphalt regeneration agent can better restore the viscoelasticity of aged asphalt, thereby improving the road performance of the regenerated asphalt mixture.
[0047] It should be noted that the above embodiments all belong to the same inventive concept, and the description of each embodiment has its own focus. For any details not described in individual embodiments, reference may be made to the description in other embodiments.
[0048] The above-described embodiments merely illustrate the implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.
Claims
1. A reactive asphalt regeneration agent, characterized in that: It includes a reactive diluent, oil extracted from the second line and oil sulfide; wherein the mass ratio of the reactive diluent, oil extracted from the second line and oil sulfide is 1: (0.1-0.3): (0.3-0.5); the oil sulfide is a base oil modified by a sulfiding agent.
2. The reactive asphalt regeneration agent according to claim 1, characterized in that: The vulcanizing agent includes at least one of sulfur and dicumyl peroxide; The base oil component includes one or more of peanut oil, rapeseed oil, palm oil and castor oil.
3. The reactive asphalt regeneration agent according to claim 1, characterized in that: The method for preparing the oil sulfide comprises the following steps: The base oil is dried and mixed with a sulfiding agent to obtain a mixture; The mixture is heated to a first preset temperature, kept at the temperature for a first preset time, and then heated to a second preset temperature, kept at the temperature for a second preset time, and cooled to obtain the oil sulfide.
4. The reactive asphalt regeneration agent according to claim 3, characterized in that: The mass ratio of the base oil to the vulcanizing agent is 100:(0.5~30); The first preset temperature is 120-150° C., and the first preset time is 10-30 minutes; the second preset temperature is 160-180° C., and the second preset time is 1-2 hours.
5. The reactive asphalt regeneration agent according to claim 1, characterized in that: The reactive diluent is tall oil acid.
6. A recycled asphalt mixture, characterized in that: It comprises waste asphalt mixture, new asphalt, mineral powder, alkaline compound and the reactive asphalt regeneration agent according to any one of claims 1 to 5; the waste asphalt mixture comprises natural mineral materials and waste asphalt concrete.
7. The regenerated asphalt mixture according to claim 6, characterized in that: The mass ratio of the waste asphalt mixture, new asphalt, mineral powder, alkaline compound and reactive asphalt regeneration agent is 100: (1.5~3.5): (1~4): (1~2): (0.15~0.35); in the waste asphalt mixture, the mass ratio of the natural mineral material and the waste asphalt concrete is 100: (10~70).
8. The regenerated asphalt mixture according to claim 6, characterized in that: The natural mineral material is one or more of limestone, basalt and diabase; The waste asphalt concrete is obtained by milling and crushing old asphalt pavement, and has a size of one or more of 0-5 mm, 0-10 mm, and 10-15 mm; The new asphalt is any one of No. 70 road petroleum asphalt, No. 90 road petroleum asphalt, and polymer modified asphalt; the mineral powder is limestone mineral powder; The alkaline compound is one or more of calcium oxide, magnesium oxide, calcium hydroxide and calcium aluminate.
9. A method for preparing a regenerated asphalt mixture according to any one of claims 6 to 8, characterized in that: The following steps are involved: The natural mineral materials, waste asphalt concrete, new asphalt and reactive asphalt regeneration agent are preheated respectively; The preheated natural mineral material and waste asphalt concrete are mixed evenly to obtain waste asphalt mixture; The waste asphalt mixture, the new asphalt after preheating treatment, the reactive asphalt regeneration agent after preheating treatment, the mineral powder and the alkaline compound are uniformly mixed to obtain a regenerated asphalt mixture.
10. The method for preparing recycled asphalt mixture according to claim 9, characterized in that: In the preheating treatment step, the preheating temperature of the natural mineral material is 180-200°C, the preheating temperature of the waste asphalt concrete is 120-130°C, the preheating temperature of the new asphalt is 150-165°C, and the preheating temperature of the reactive asphalt regeneration agent is 120-165°C.