Modified additive for bio-oil regenerated aged asphalt as well as preparation method and application of modified additive

Abstract

The invention discloses a modified additive for bio-oil regenerated aged asphalt. The modified additive is a high-temperature mixture of waste plastics and a plasticizer, the modified additive is externally doped into the bio-oil regenerated aged asphalt mixture to be used as a reinforcing agent, the plasticizer is added into the waste plastic, so that the waste plastic can be well helped to be uniformly dispersed in the asphalt, and the prepared modified additive can effectively improve the adhesion performance between the waste asphalt and stones; compared with the prior art, the regenerated aged asphalt has the advantages that the overall high-temperature stability and mechanical property are improved, the rutting resistance is also remarkably improved, the elasticity modulus is higher, the durability and the aging resistance are improved, and other properties of the regenerated aged asphalt can be recovered and the indexes of asphalt and a mixture meet the standard requirements under the condition that no other admixture is added. The preparation method of the modified additive has the characteristics of being simple in operation method, controllable in condition, simple in operation equipment, low in raw material price, relatively low in cost, high in yield, low in energy consumption, low in pollution and the like.

Description

Technical Field

[0001] The present invention relates to the field of asphalt regeneration, and in particular to a modified additive for regenerating aged asphalt with bio-oil, a preparation method and application thereof. Background Art

[0002] Asphalt concrete pavement is currently one of the predominant types of highway pavement, but it can develop road surface defects due to various factors, including climate and traffic load. Over the past few decades, my country's highways have reached saturation and are entering a period of extensive maintenance. The renovation and expansion of asphalt pavement in my country generates tens of millions of tons of recycled asphalt pavement material annually. Although asphalt undergoes certain damage after aging, the gravel and sand in it generally continue to function. Therefore, recycling waste aged asphalt could save significant construction and maintenance costs, reduce the exploitation of gravel resources, and reduce damage to the natural environment, resulting in significant economic and social benefits. Petroleum-based recycled asphalt is currently the most widely used asphalt material for regeneration after aging, but it contains numerous harmful substances such as xylene and polycyclic aromatic hydrocarbons, and generally has insufficient aging resistance. Compared to petroleum-based recycled asphalt, plant oil-based regeneration agents are considered a long-term, sustainable alternative to petroleum-based materials and are a new technology developed over the past decade. However, there are many different types of plant oils, and their regeneration efficiency, ease of handling, and cost control vary significantly. Furthermore, plant oil regeneration agents can present performance stability and compatibility issues with waste asphalt. More importantly, the addition of bio-oil-based regeneration agents to waste asphalt can lead to a decrease in the mechanical properties and high-temperature thermal stability of the asphalt.

[0003] Therefore, it is necessary to solve the problem of decreased mechanical properties and high-temperature thermal stability of asphalt caused by the addition of bio-oil regeneration agent in bio-based recycled asphalt. Summary of the Invention

[0004] The purpose of the present invention is to provide a modified additive for bio-oil regeneration of aged asphalt, a preparation method and its application, and to add the modified additive to bio-oil regeneration of aged asphalt to improve the problem of decreased mechanical properties and high-temperature thermal stability of bio-oil regeneration aged asphalt mixture caused by the use of bio-oil regeneration agent.

[0005] The modified additive for regenerating aged asphalt from bio-oil of the present invention is a high-temperature mixture of waste plastics and a plasticizer;

[0006] Furthermore, the waste plastic is one or a mixture of two or more of low-density polyethylene waste plastic, high-density polyethylene waste plastic, polypropylene waste plastic, polyvinyl chloride waste plastic, polystyrene waste plastic, and polyamide waste plastic;

[0007] Furthermore, the plasticizer is one or a mixture of two or more of dibutyl phthalate, dioctyl phthalate, diisononyl phthalate, ethylene glycol, polyethylene glycol, and citric acid triacetate;

[0008] Furthermore, the mass ratio of the waste plastic to the plasticizer is 4:3-5.

[0009] The present invention also discloses a method for preparing a modified additive for regenerating aged asphalt from bio-oil, comprising the following steps: melting and blending waste plastic particles and plasticizer particles at high temperature;

[0010] Furthermore, a twin-screw extruder is used for melt blending, the temperature of the twin-screw extruder is controlled at 200-460° C., and the heating rate is not greater than 20° C. / min;

[0011] Furthermore, the reaction time after reaching the set temperature under normal pressure closed environment conditions is controlled to be 25 to 50 minutes.

[0012] The invention also discloses an application of a modified additive for regenerating aged asphalt using bio-oil, wherein the modified additive is added to the aged asphalt regenerated using bio-oil at a rate of 1 wt% to 10 wt%.

[0013] The beneficial effects of the present invention are as follows: the modified additive, preparation method and application thereof for bio-oil regeneration of aged asphalt of the present invention are added to the bio-oil regeneration of aged asphalt mixture as a reinforcing agent, and the addition of plasticizer to waste plastic can well help the waste plastic to be evenly dispersed in the asphalt. The prepared modified additive can effectively improve the adhesion between waste asphalt and stone, improve its overall high-temperature stability and mechanical properties, significantly increase its anti-rutting ability, and have a high elastic modulus, thereby improving durability and anti-aging performance. This solves the shortcomings of using only bio-oil regeneration agents, and without adding any other admixtures, the other properties of the regenerated aged asphalt can be restored and the indicators of the asphalt and the mixture can meet the standard requirements. The preparation method of the modified additive has the characteristics of simple operation method, controllable conditions, simple operation equipment, low raw material price, low cost, high output, low energy consumption, and low pollution, which not only reduces the cost of regenerating aged asphalt, but also plays an environmentally friendly recycling role. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0015] Figure 1 is the adhesion work of the matrix asphalt and the regenerated asphalt of the present invention;

[0016] Figure 2 Atomic force microscope images of base asphalt and the regenerated asphalt of the present invention;

[0017] Figure 3 SEM images of different asphalt samples, including (a) base asphalt (b) aged asphalt (c) vegetable oil recycled asphalt (d) vegetable oil recycled asphalt modified with PE blend;

[0018] Figure 4 AFM morphology images, including (a) base asphalt (b) aged asphalt (c) vegetable oil recycled asphalt (d) vegetable oil recycled asphalt modified with PE blend;

[0019] Figure 5 DSC curves of different asphalts; among them, (a) base asphalt (b) aged asphalt (c) vegetable oil recycled asphalt (d) vegetable oil recycled asphalt modified with PE mixture. DETAILED DESCRIPTION

[0020] The modified additive for regenerating aged asphalt with bio-oil in this embodiment is a high-temperature mixture of waste plastics and a plasticizer. The modified additive of the present invention enhances the modified properties of aged asphalt regenerated with bio-oil. Since the bio-oil modifier is added to the regenerated aged asphalt, while the bio-oil can restore the physical and rheological properties of the aged asphalt and improve the road performance of the regenerated asphalt mixture, it can also reduce the mechanical properties and high-temperature thermal stability of the asphalt. Therefore, by adding the modified additive of the present invention, the softening point index of the regenerated asphalt is significantly increased. Dynamic shear rheology experiments have demonstrated that the modified additive can significantly improve its high-temperature resistance and durability. Contact angle tests have shown that the modified additive can increase the adhesion work of bio-oil (especially palm oil) regenerated asphalt to aggregate by nearly three times, and other performance properties meet regulatory requirements.

[0021] In this embodiment, the waste plastic is one or a mixture of two or more of low-density polyethylene waste plastic, high-density polyethylene waste plastic, polypropylene waste plastic, polyvinyl chloride waste plastic, polystyrene waste plastic, and polyamide waste plastic; waste plastic is a general term for plastics that have been used for civil, industrial and other purposes and are eventually eliminated or replaced. One type of waste plastic can be used, or a mixture of multiple plastics can be used.

[0022] In this embodiment, the plasticizer is one or a mixture of two or more of dibutyl phthalate, dioctyl phthalate, diisononyl phthalate, ethylene glycol, polyethylene glycol, and triacetic acid citric acid; the above plasticizers are preferably used, and other plasticizers that can react with waste plastics and play the same role can also be used.

[0023] In this embodiment, the mass ratio of the waste plastic to the plasticizer is 4:3-5; the PE:plasticizer ratio can be 4:3, 4:3.5, 1:1, 4:4.5, 4:5, etc.

[0024] This embodiment also discloses a method for preparing a modified additive for regenerating aged asphalt from bio-oil, comprising the following steps: melt-blending waste plastic particles and plasticizer particles at high temperature; using a twin-screw extruder for melt blending, wherein the temperature of the twin-screw extruder is controlled at 200-460°C, with a heating rate of no more than 20°C / min; and controlling the reaction time after reaching the set temperature to 25-50 minutes under normal pressure and closed environment conditions. Using a twin-screw extruder or internal mixer, the specific operations are as follows:

[0025] a. Pretreatment of waste plastics: Cut different plastics into small particles through an extruder, and then crush the obtained plastic particles after drying to obtain fine plastic particles.

[0026] b. Production of waste plastic mixtures: Place a certain amount of waste plastic pellets into a twin-screw extruder, set the six temperature zones and main screw speed, then activate the heating button. Once the temperature reaches the set value, initiate cooling and maintain constant temperature. Once constant temperature is achieved, pour the waste plastic pellets into the hopper at the set temperature and speed, and clean impurities from within the screw. Pour a fixed amount of waste plastic and plasticizer pellets into the hopper, place the sample can in the die head for cooling, then activate the main screw and feed screw buttons. Start timing when the plastic pellets enter the screw, record the time at the beginning of extrusion, and weigh and record the mass after complete extrusion and cooling.

[0027] The present invention also discloses a modified additive for regenerating aged asphalt using bio-oil. The modified additive is added to the bio-oil-regenerated aged asphalt at a rate of 1-10 wt%. The bio-oil-incorporated asphalt is heated to a molten state, and then a predetermined amount of the modified additive is added. Before use, the modified additive should be crushed using a high-speed crusher and then ground into smaller powder particles to facilitate uniform dispersion within the asphalt. When added at a rate of 1-10 wt%, the resulting modified asphalt exhibits a simulated regeneration effect, with a softening point over 10°C higher than that of 70# base asphalt and palm oil-regenerated asphalt, significantly improving its high-temperature resistance. Furthermore, the regenerated asphalt exhibits excellent adhesion, as measured by contact angle. Its adhesion work is doubled compared to base asphalt, and nearly tripled compared to palm oil-regenerated asphalt, significantly enhancing its resistance to spalling from stone and waste asphalt. The Marshall stability of the asphalt SMA mixture exceeds 7.0 kN, and the flow value is between 2 and 4 mm, meeting the requirements of warm-mix asphalt specifications.

[0028] Example 1

[0029] (1) Preparation of high / low density polyethylene (HDPE / LDPE) waste plastic compounding and modification additives: Weigh 4 portions of 100.0 g HDPE / LDPE plastic pellets, weigh different proportions of low-density polyester elastic plasticizers and put them into 4 iron cans numbered 1, 2, 3, and 4, and add 500.0 g of tap water. Set the temperature of the 6 temperature zones and the main screw speed, and the feed screw speed is 5 r / min. Then start the heating button, and heat the six temperature zones to the specified temperature (200°C, 210°C, 220°C, 230°C, 240°C, and 250°C) respectively. Keep the temperature constant for 30 minutes and then start. After cooling to room temperature, take out the product, weigh it, collect it in a sample bag, and store it at room temperature. The four groups of PE molten pellets obtained are marked as 1a, 1b, 1c, 1d, and 1e respectively.

[0030] (2) Modification of Palm Oil Asphalt with HDPE / LDPE Waste Plastic Modification Additives: A sufficient amount of 70# base asphalt was heated to approximately 130°C in a container. Mixed powders of varying mass percentages (6%, 7%, 8%, 9%, and 10%) were stirred and sheared until completely dissolved in the palm oil asphalt, yielding recycled asphalt from the waste plastic mixture. The resulting modified asphalts were labeled asphalt 1a, asphalt 1b, asphalt 1c, asphalt 1d, and asphalt 1e, respectively.

[0031] Example 2

[0032] (1) Preparation of polypropylene (PP) plastic compounding and modification additives: Weigh 4 portions of 100.0 g PP plastic pellets, weigh different proportions of dioctyl phthalate (DOP), and place them in a closed twin-screw extruder under normal pressure. Control the heating rate to about 10°C / min, and heat the six temperature zones to the designated temperatures (200°C, 210°C, 220°C, 230°C, 240°C, and 250°C). Start cooling and keep the temperature constant for 30 minutes. After cooling to room temperature, remove the product, weigh it, collect it in a sample bag, and store it at room temperature. The resulting four groups of PE melt pellets are labeled 2a, 2b, 2c, 2d, and 2e, respectively.

[0033] (2) Modification of Palm Oil Asphalt with Modified Additives from PP Waste Plastic Mixtures: A sufficient amount of 70# base asphalt was placed in a container and heated to approximately 130°C. Mixed powders of varying mass percentages (6%, 7%, 8%, 9%, and 10%) were stirred and sheared until completely dissolved in the palm oil asphalt, yielding recycled asphalt from the waste plastic mix. The resulting modified asphalts were labeled as 2a asphalt, 2b asphalt, 2c asphalt, 2d asphalt, and 2e asphalt, respectively.

[0034] Example 3

[0035] (1) Preparation of a polyvinyl chloride (PVC) plastic compounding and modification additive: Weigh 4 portions of 100.0 g PP plastic pellets and diisononyl phthalate (DINP) and place them in a closed, atmospheric twin-screw extruder. The extruder is heated at a rate of approximately 10°C / min in six temperature zones to designated temperatures (200°C, 210°C, 220°C, 230°C, 240°C, and 250°C). Cooling is initiated and the temperature is maintained constant for 30 min. After cooling to room temperature, the product is removed, weighed, collected in a sample bag, and stored at room temperature.

[0036] (2) Modification of palm oil asphalt with PVC waste plastic mixture modification additives: Take a sufficient amount of 70# base asphalt, put it into a container and heat it to about 130°C, add 8% by mass of mixing powder into it, and stir and shear it at the same time until it is completely dissolved in the palm oil asphalt, to obtain waste plastic mixture recycled asphalt, marked as 3# asphalt.

[0037] Example 4

[0038] (1) Preparation of polystyrene (PS) plastic compounding and modification additives: Weigh 4 portions of 100.0 g PP plastic pellets and polyethylene glycol (PEG) and place them in a closed twin-screw extruder at atmospheric pressure. The extruder is heated at a rate of approximately 10°C / min in six temperature zones to designated temperatures (200°C, 210°C, 220°C, 230°C, 240°C, and 250°C). Cooling is initiated and the temperature is maintained constant for 30 min. After cooling to room temperature, the product is removed, weighed, collected in a sample bag, and stored at room temperature.

[0039] (2) Modification of palm oil asphalt with PS plastic compound modification additives: Take a sufficient amount of 70# base asphalt, put it into a container and heat it to about 130°C, add 8% by mass of mixing powder into it, and stir and shear it at the same time until it is completely dissolved in the palm oil asphalt, to obtain waste plastic compound recycled asphalt, marked as 4# asphalt.

[0040] Comparative Example 1

[0041] Shell 70# base asphalt without any modifier was used as a comparative example and marked as DB1.

[0042] Comparative Example 2

[0043] The asphalt after aging treatment of Shell 70# base asphalt without any modifier was used as a comparative example and marked as DB2.

[0044] Comparative Example 3

[0045] The recycled waste asphalt containing palm oil was added to Shell 70# base asphalt that had undergone aging treatment in comparison 2 and was marked as DB3.

[0046] The performance test of waste plastic mixed with recycled asphalt was carried out, and the test results are as follows:

[0047] 1. The three major indicators (penetration, softening point, and ductility) were tested on the four modified asphalts in Example 1 and the comparative example. Each group of samples was tested three times and the average value was taken. The results are shown in Table 1.

[0048] Three major indicators of modified asphalt obtained in Example 1

[0049]

[0050] As shown in Table 1, several groups of HDPE / LDPE mixed particles can increase the softening point of asphalt, and the recycled asphalt shows good high-temperature performance. At the same time, the penetration and ductility of the recycled asphalt also meet the specification requirements.

[0051] 2. The adhesion performance of the four modified asphalts in Example 2 and the comparative example was tested three times for each group of samples and the average value was taken. The results are shown in the figure. Figure 1 shown.

[0052] Depend on Figure 1 It can be seen that several groups of polypropylene (PP) plastic compounding regeneration agents have increased the adhesion work by nearly twice compared with 70# matrix asphalt, and increased the adhesion work by three times compared with palm oil recycled asphalt, further enhancing the regeneration effect of waste and aged asphalt and improving the adhesion ability of asphalt and stone.

[0053] 3. Atomic energy microscope tests were performed on the asphalt, aged asphalt and palm oil recycled asphalt in Example 3. The samples were smeared on glass slides and cooled to room temperature before testing. The results are shown in the figure below. Figure 2 shown.

[0054] Depend on Figure 2 It can be seen that polyvinyl chloride (PVC) plastic compounding regeneration agent has good dispersion performance on the surface of palm oil asphalt.

[0055] 4. The three groups of modified asphalts in Example 2, Example 3, and Example 4, 2c# asphalt, 3# asphalt, and 4# asphalt, were subjected to Marshall stability index tests. The mineral gradation was designed using the SMA-13 ​​standard. The optimal oil-stone ratio was determined to be 4.8% through experiments. Marshall specimens were made using a Marshall compactor. The Marshall stability and flow values ​​of several modified asphalt mixtures are shown in Table 2.

[0056] Table 2. Marshall stability and flow value of recycled asphalt mixture

[0057]

[0058] The Marshall stability index test shows that the average stability of several groups of modified asphalt mixtures is greater than 6.0KN, which is higher than the requirements of the Highway Asphalt Construction Technical Specification (JTG F40-2004); the flow values ​​of the three groups of modified asphalt mixtures meet the specification requirements.

[0059] Depend on Figure 3 It can be seen that the matrix asphalt ( Figure 1 The SEM image of a) shows that its surface is a continuous and smooth "film-like structure" with light-colored areas evenly distributed. Aged asphalt ( Figure 1 b) A large number of network cracks and honeycomb-like holes appear on the surface, with crack widths of about 5-10μm and holes up to 20-30μm in diameter. This is because during the aging process of asphalt, the light components evaporate or oxidize to form macromolecular asphaltene, causing the colloidal structure to transform from a "sol type" to a "gel type". Volume shrinkage generates internal stress, ultimately forming structural defects and significantly reducing the interfacial adhesion strength. Recycled asphalt ( Figure 1 c) The number of surface cracks decreased by about 60%, and the holes basically disappeared, replaced by a relatively flat "hilly" surface. However, the asphalt showed no obvious granular structure, indicating that palm oil mainly improved the interface integrity through physical dissolution, but lacked a mechanical meshing reinforcement mechanism, and the improvement in adhesion performance was limited. PE compound modified recycled asphalt ( Figure 1 The SEM image of (d) reveals a unique "island structure": PE particles (dark areas) with a diameter of approximately 2-5 μm are evenly dispersed in the asphalt matrix (light continuous phase), with a thin film of asphaltene approximately 100-200 nm thick adsorbed on the particle surface, forming a "core-shell" structure. This structure increases the asphalt surface roughness by 3.8 times compared to palm oil recycled asphalt, increasing the equivalent surface area and effectively improving the adhesion between asphalt and aggregate. The main mechanism of action is: the rough surface of the PE particles forms a "mortise and tenon" fit with the micropores of the aggregate. When subjected to shear forces, the particles can transfer stress through mechanical interlocking, delaying interfacial debonding. In addition, the plasticizer on the surface of the PE particles contains polar ester groups, which can adsorb polar functional groups in the asphaltene, increasing the asphaltene concentration around the particles by approximately 1.8 times, forming a localized high-polarity region and enhancing hydrogen bonding with the hydroxyl (-OH) groups on the aggregate surface.

[0060] Figure 4 In the matrix asphalt ( Figure 2 The AFM height map of a) shows that the light-colored area accounts for about 65%, corresponding to the low-viscosity oil and resin components; the dark-colored area accounts for 35%, mainly asphaltene aggregates. At this time, the polar components are distributed in an "island-like" manner, the surface energy uniformity is poor, and the interfacial adhesion with the aggregate depends on randomly distributed polar sites. Aged asphalt ( Figure 2b) The dark area accounts for 58% and forms asphaltene aggregates with a size of 10-20 μm, which leads to an increase in the uneven distribution of surface energy. The light area around the aggregates appears to be an "oil-poor zone" with a thickness of about 5-8 μm, which further weakens the interfacial wettability. Figure 2 d), the proportion of dark areas increased to 72%, and showed a "honeycomb" uniform distribution, and the size of individual asphaltene aggregates was reduced to 2-5μm. This is mainly due to the branched structures (such as alkyl side chains) on the PE molecular chain adsorbing asphaltene molecules through van der Waals forces, forming a "PE-asphaltene" cross-linked network, which transformed the polar components from disordered agglomeration to an ordered network distribution, reduced the surface energy mean square deviation by 42%, and improved the stability of interfacial adsorption. In addition, the AFM force curve test showed that the peak adhesion force between PE-modified recycled asphalt and limestone reached 8.5nN, which was 102% higher than that of palm oil recycled asphalt (4.2nN), indicating that the enrichment of polar components significantly increased the number of interfacial hydrogen bonds.

[0061] according to Figure 5 Differential scanning calorimetry analysis (high temperature performance) shows that the Tg value reflects the temperature at which the material transitions from a glassy state to a highly elastic state. The higher the Tg value, the stronger the material's ability to maintain rigidity at high temperatures. Figure 5 As can be seen from Table 3, the Tg of palm oil recycled asphalt dropped to -10.5℃ ( Figure 5 c) This is because the low molecular weight oil in palm oil dilutes the asphaltene network and reduces the intermolecular force. After adding 4.5% PE to the mixture, the Tg is significantly increased to 12.6℃ ( Figure 5 d), 23.1℃ higher than that of palm oil recycled asphalt. The polymer chains (such as polyethylene) in the PE compound form a network structure through physical entanglement, which restricts the thermal movement of the asphalt molecular chains and makes the material less likely to soften and deform at high temperatures. This shows that it effectively improves the thermal stability by increasing the rigid network of the asphalt phase, approaching the level of aged asphalt while retaining a certain degree of flexibility. In addition, the DSC heating curve shows that the PE compound modified recycled asphalt has a weak endothermic peak at 105℃ ( Figure 5 d) corresponds to the crystallization and melting of PE molecular chains, indicating that some PE particles have formed nanoscale crystalline domains (approximately 10-50 nm in size). These rigid crystalline domains further secure the asphalt molecular chains through physical crosslinking. This crosslinking, which requires no chemical reaction but is achieved through van der Waals forces and chain entanglement, prevents molecular chain slippage at high temperatures and effectively enhances the asphalt's resistance to high-temperature deformation.

[0062] Table 3 Glass transition temperature Tg values ​​of different asphalt samples

[0063] Asphalt type Glass transition temperature Tg value (℃) A 5.6 RA 35.4 3% LMPO -10.5 4.5% PPL 12.6

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A modified additive for regenerating aged asphalt with bio-oil, characterized by: The modified additive is a high-temperature mixture of waste plastics and plasticizers.

2. The modifying additive for regenerating aged asphalt with bio-oil according to claim 1, characterized in that: The waste plastic is one or a mixture of two or more of low-density polyethylene waste plastic, high-density polyethylene waste plastic, polypropylene waste plastic, polyvinyl chloride waste plastic, polystyrene waste plastic, and polyamide waste plastic.

3. The modifying additive for regenerating aged asphalt with bio-oil according to claim 1, characterized in that: The plasticizer is one or a mixture of two or more of dibutyl phthalate, dioctyl phthalate, diisononyl phthalate, ethylene glycol, polyethylene glycol, and citric acid triacetate.

4. The modifying additive for regenerating aged asphalt with bio-oil according to claim 1, characterized in that: The mass ratio of the waste plastic to the plasticizer is 4:3-5.

5. The method for preparing a modified additive for regenerating aged asphalt with bio-oil according to claim 1, characterized in that: The following steps are involved: The waste plastic particles and plasticizer particles are melt-blended at high temperature.

6. The method for preparing a modified additive for regenerating aged asphalt with bio-oil according to claim 5, characterized in that: A twin-screw extruder is used for melt blending, the temperature of the twin-screw extruder is controlled at 200-460° C., and the heating rate is no more than 20° C. / min.

7. The method for preparing a modified additive for regenerating aged asphalt with bio-oil according to claim 5, characterized in that: The reaction time after reaching the set temperature under normal pressure closed environment conditions is controlled to be 25 to 50 minutes.

8. The use of the modifying additive for regenerating aged asphalt from bio-oil according to claim 1, characterized in that: The modified additive is added into the bio-oil regenerated aged asphalt at 1 wt% to 10 wt%.

Images