Waste asphalt mixture warm-mixing modified composite regenerant, preparation method thereof and regenerated asphalt

Abstract

The invention provides a waste asphalt mixture warm-mixing modified composite regenerant, a preparation method thereof and recycled asphalt. Based on the total mass of the warm-mixing modified composite regenerant being 100%, the warm-mixing modified composite regenerant comprises the following components: 40%-60% of a regeneration additive, 20%-30% of a plasticizing softener, 9%-20% of a thermoplastic elastomer, 1%-3% of a stabilizer and 10%-20% of a viscosity-reducing drag-reducing agent. The waste asphalt mixture warm mixing modification composite regenerant provided by the invention can realize efficient regeneration, energy conservation and emission reduction of the waste asphalt mixture. Functionally, the warm-mixing modified composite regenerant can recover the activity of the aged asphalt in a targeted manner, enhance the bonding of new and old materials, and endow special properties such as warm mixing and self-healing. In the aspect of stability, the warm mixing modified composite regenerant can significantly improve thermal oxidation stability and water damage resistance, and widen a construction temperature window.

Description

Technical Field

[0001] The invention relates to a waste asphalt mixture warm-mix modified composite regeneration agent, a preparation method thereof, and regenerated asphalt, belonging to the technical field of road engineering materials. Background Art

[0002] Currently, considering resource conservation and environmental protection, the long mileage and large scale of road projects necessitate a change in the high-energy consumption and high-pollution production methods of traditional road construction and maintenance. Recycling the vast amount of waste asphalt mixture has become a top priority.

[0003] Warm-mix recycling is an innovative technology widely used in asphalt pavement repair and maintenance. It involves mixing recycled asphalt pavement (RAP) with new asphalt binder and additives at a relatively low temperature. The mixture is then used to lay the new pavement structure. The core of warm-mix recycling lies in the effective utilization of recycled asphalt pavement materials. After pre-processing such as crushing and screening, these materials are added back into the new mix. The use of recycled materials not only reduces the demand for natural aggregates and the environmental damage caused by resource extraction, but also reduces project costs to a certain extent.

[0004] At present, although warm mix recycling technology can utilize a large proportion of waste mixtures, the effect of regenerating asphalt in the old materials is poor, and it cannot meet the requirements for heavy traffic road surface use, and can only be used in the base layer or lower layer.

[0005] While warm-mix recycling technology can improve the performance of the mixture to a certain extent, long-term durability challenges remain. Additives in warm-mix mixtures may gradually lose their effectiveness over time and due to environmental factors, leading to a decline in asphalt performance. This, in turn, affects the pavement's long-term performance, including high-temperature stability, low-temperature crack resistance, and water stability. For example, under conditions such as prolonged UV exposure and rainwater erosion, warm-mix recycled pavements may experience aging and crack expansion earlier than hot-mix asphalt pavements, shortening the pavement's service life.

[0006] Furthermore, many warm-mix recycling additives are expensive, which directly increases the production cost of warm-mix recycled mixtures. For example, some high-performance additives can cost several times more per unit mass than standard additives. For large-scale road construction projects, the increased cost of additives can significantly impact the overall budget, limiting the application of warm-mix recycling technology in projects with strict cost controls.

[0007] Therefore, there is an urgent need to study a warm-mix modified composite regeneration agent suitable for waste asphalt to improve the performance of waste asphalt, thereby improving the road performance and durability of warm-mix waste asphalt mixture. Summary of the Invention

[0008] Problems to be solved by the invention

[0009] In view of the technical problems existing in the prior art, for example, the problems existing in the recycling of waste asphalt mixtures in the prior art, the present invention first provides a waste asphalt mixture warm mix modified composite regeneration agent that integrates regeneration, warm mixing and modification functions to achieve efficient regeneration of waste asphalt mixtures and energy conservation and emission reduction.

[0010] Furthermore, the present invention also provides a preparation method of a warm-mix modified composite regeneration agent, which is simple and easy to implement, and the raw materials are easy to obtain, and is suitable for mass production.

[0011] Furthermore, the present invention also provides a regenerated asphalt. The high-temperature stability, low-temperature crack resistance, durability and other indicators of the regenerated asphalt of the present invention can approach or reach the new asphalt standards, meeting the needs of road construction.

[0012] Solutions for solving problems

[0013] [1] A warm-mix modified composite regeneration agent, wherein, based on the total mass of the warm-mix modified composite regeneration agent as 100%, it comprises the following components:

[0014] Regeneration additives: 40%-60%,

[0015] Plasticizer: 20%-30%,

[0016] Thermoplastic elastomer: 9%-20%,

[0017] Stabilizer: 1%-3%,

[0018] Viscosity reducing and drag reducing agent: 10%-20%.

[0019] [2] The warm-mix modified composite regeneration agent according to [1] above, wherein the regeneration additive comprises saturates, aromatics, colloids and penetrating components; wherein, based on the total mass of the regeneration additive being 100%, the content of the aromatics is 5%-30%, the content of the saturates is 50%-80%, the content of the colloids is 0.5%-5%, and the content of the penetrating components is 5%-15%.

[0020] [3] The warm-mix modified composite regeneration agent according to [2] above, wherein the saturated fraction includes linear alkanes, branched alkanes and cyclic alkanes; and the aromatic fraction includes aromatic hydrocarbons containing benzene rings or their derivatives.

[0021] [4] The warm-mix modified composite regenerator according to any one of [1] to [3] above, wherein the plasticizer and softener comprises cycloalkyl rubber oil and / or cyclohexane.

[0022] [5] The warm-mix modified composite regeneration agent according to any one of [1] to [4] above, wherein the thermoplastic elastomer comprises a block copolymer of styrene and butadiene.

[0023] [6] The warm-mix modified composite regenerator according to any one of [1] to [5] above, wherein the stabilizer comprises zinc dimethyldithiocarbamate.

[0024] [7] The warm-mix modified composite regenerator according to any one of [1] to [6] above, wherein the viscosity-reducing and drag-reducing agent comprises a fluorinated surfactant, preferably perfluorohexanoate.

[0025] [8] A method for preparing a warm-mix modified composite regeneration agent according to any one of [1] to [7] above, comprising the step of mixing the components of the warm-mix modified composite regeneration agent.

[0026] Preferably, the preparation method comprises the following steps:

[0027] Premixing a regenerating agent, a plasticizer and a thermoplastic elastomer to obtain a premix;

[0028] performing a shearing treatment on the premix to obtain a sheared product;

[0029] The sheared product is mixed with a stabilizer and then grown to obtain a grown product;

[0030] The developed product is mixed with a viscosity reducing and drag reducing agent to obtain a warm-mix modified composite regeneration agent.

[0031] [9] The preparation method according to [8] above, wherein the pre-mixing temperature is 120 to 180°C; and / or

[0032] The shearing treatment temperature is 165-175° C., the shearing treatment rate is 3000-5000 r / min, and the shearing treatment time is 20-120 min; and / or,

[0033] The growth temperature is 165-175° C., and the growth time is 20-120 minutes.

[0034]

[10] A regenerated asphalt comprising a warm mix modified composite regeneration agent and waste asphalt; preferably, the content of the warm mix modified composite regeneration agent is 5-40% based on the total mass of the waste asphalt as 100%.

[0035] Effects of the Invention

[0036] The warm-mix modified composite regeneration agent for waste asphalt mixtures of the present invention can achieve efficient regeneration of waste asphalt mixtures and energy conservation and emission reduction. In terms of functionality, the warm-mix modified composite regeneration agent can target and restore the activity of aged asphalt, enhance the adhesion between new and old materials, and impart special properties such as warm mixing and self-healing. In terms of stability, the warm-mix modified composite regeneration agent can significantly improve thermal oxygen stability and resistance to water damage, and widen the construction temperature window. Compared with traditional regeneration agents, the warm-mix modified composite regeneration agent of the present invention can increase the softening point recovery rate of aged asphalt by 25%-35% and reduce the construction temperature by 20-30°C.

[0037] The preparation method of the warm-mix modified composite regeneration agent of the present invention is simple and easy, the raw materials are easy to obtain, and the agent is suitable for mass production.

[0038] The high-temperature stability, low-temperature crack resistance, durability and other indicators of the regenerated asphalt of the present invention can reach the new asphalt standards and can meet the needs of road construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The following is a flow chart of the preparation process of the warm mix modified composite regeneration agent for waste asphalt mixture;

[0040] Figure 2 A process flow chart for the preparation of recycled asphalt is shown. DETAILED DESCRIPTION

[0041] Various exemplary embodiments, features, and aspects of the present invention will be described in detail below. The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as superior or preferred over other embodiments.

[0042] In addition, numerous specific details are provided in the following detailed description to better illustrate the present invention. Those skilled in the art will appreciate that the present invention can be practiced without certain specific details. In other instances, methods, means, equipment, and steps well known to those skilled in the art are not described in detail in order to highlight the main points of the present invention.

[0043] Unless otherwise stated, the units used in this specification are international standard units, and the numerical values and numerical ranges appearing in the present invention should be understood to include the inevitable systematic errors in industrial production.

[0044] In this specification, the use of "may" includes both the meaning of performing a certain process and the meaning of not performing a certain process.

[0045] In this specification, references to "some specific / preferred embodiments," "other specific / preferred embodiments," "embodiments," etc., mean that the specific elements (e.g., features, structures, properties, and / or characteristics) described in connection with the embodiments are included in at least one embodiment described herein, and may or may not be present in other embodiments. In addition, it should be understood that the elements may be combined in various embodiments in any suitable manner.

[0046] In this specification, the numerical range expressed using "a numerical value A to a numerical value B" means a range including the endpoints A and B.

[0047] <First Aspect>

[0048] The first aspect of the present invention provides a warm-mix modified composite regeneration agent, which comprises the following components, based on the total mass of the warm-mix modified composite regeneration agent being 100%:

[0049] Regeneration additives: 40%-60%,

[0050] Plasticizer: 20%-30%,

[0051] Thermoplastic elastomer: 9%-20%,

[0052] Stabilizer: 1%-3%,

[0053] Viscosity reducing and drag reducing agent: 10%-20%.

[0054] Regeneration additives

[0055] The regeneration additive of the present invention can supplement the saturated components, aromatic components, colloid and other components missing from the aged asphalt, improve the performance of the aged asphalt, and restore the road performance of the waste asphalt mixture so that it can be reused in road construction.

[0056] In the present invention, based on the total mass of the warm-mix modified composite regeneration agent as 100%, the content of the regeneration additive is 40%-60%, for example, 42%, 45%, 48%, 50%, 52%, 55%, 58%, etc. When the content of the regeneration additive is 40%-60%, the regeneration additive can sufficiently replenish the saturates, aromatics, colloids, and other components missing from the aged asphalt, thereby effectively fulfilling its function. If the content of the regeneration additive is less than 40%, it cannot provide sufficient saturates, aromatics, colloids, and other components, resulting in insufficient improvement in key performance indicators such as ductility and softening point of the waste asphalt mixture, making it difficult to effectively restore the asphalt's viscoelasticity and road performance. If the content of the regeneration additive is greater than 60%, not only will the cost be excessive, but the excessive polar components in the system may also disrupt the balance of the original asphalt chemical composition, resulting in poor compatibility of the regenerated asphalt, causing segregation, and even reducing the high-temperature stability and water damage resistance of the mixture.

[0057] In some specific embodiments, the regeneration additive includes saturates, aromas, colloids and penetrating components; wherein, based on the total mass of the regeneration additive as 100%, the content of the aromas is 5%-30%, the content of the saturates is 50%-80%, the content of the colloids is 0.5%-5%, and the content of the penetrating components is 5% to 15%.

[0058] Specifically, the regeneration additive has a viscosity of 300-350 mPa·s at 60° C., a flash point of 220-265° C., and a relative density of 0.9-1.1 at 15° C.

[0059] Furthermore, in the present invention, the saturated fraction includes straight-chain alkanes, branched-chain alkanes and cyclic alkanes. The saturated fraction does not contain unsaturated double bonds and is the component with the smallest molecular weight and weakest polarity in asphalt. Its carbon-hydrogen ratio (C / H) is low, and the molecular formula can be expressed as C n H 2n+2 (alkanes) or C n H 2n (Cycloalkanes). The intermolecular forces of saturated hydrocarbons are weak, and they are liquid or semi-liquid at room temperature.

[0060] The aromatic fraction includes aromatic hydrocarbons containing aromatic rings or their derivatives. The aromatic fraction includes aromatic hydrocarbons containing one single ring, two rings, or multiple rings, but the number of aromatic rings is generally less than the number of benzene rings in asphaltenes. Molecules containing aromatic ring structures have slightly higher polarity than saturated fractions. Aromatic fractions have a higher carbon-to-hydrogen ratio (C / H), with aromatic rings attached to alkyl side chains, such as derivatives of benzene, naphthalene, and anthracene. Due to the conjugated structure of the aromatic rings, the molecules have a certain polarity and can form a colloidally stable system with asphaltenes.

[0061] Specifically, in the present invention, the regeneration additive can be one or a combination of two or more of the following: Koltai AM-3 regeneration agent, asphalt regeneration agent ZS-1 (Daoyi Materials), Tantu Changan brand SR series asphalt mixture regeneration agent, Jumao New Materials JM-RA asphalt regeneration agent (Jumao New Materials), etc.

[0062] Plasticizers and softeners

[0063] In the present invention, the plasticizer and softener can be used to reduce the viscosity of aged asphalt, restore the elasticity and flexibility of aged asphalt, and thus improve the construction workability and road performance of the recycled mixture.

[0064] In the present invention, based on the total mass of the warm-mix modified composite regeneration agent as 100%, the content of the plasticizer / softener is 20%-30%, for example, 22%, 24%, 26%, 28%, etc. When the content of the plasticizer / softener is less than 20%, it is difficult to reduce the viscosity of the aged asphalt, and the elasticity and flexibility of the aged asphalt cannot be fully restored. When the content of the plasticizer / softener is greater than 30%, the excessive amount of plasticizer / softener will make the aged asphalt too hard, thereby affecting the subsequent use of the regenerated asphalt.

[0065] In some specific embodiments, the plasticizer and softener includes cycloalkyl rubber oil and / or cyclohexane, preferably includes cyclohexane.

[0066] Thermoplastic elastomers

[0067] The present invention uses thermoplastic elastomers to reshape the asphalt colloid structure, thereby improving the high elastic recovery ability, temperature sensitivity adjustment ability and mechanical properties of recycled asphalt.

[0068] In the present invention, based on the total mass of the warm-mix modified composite regeneration agent as 100%, the content of the thermoplastic elastomer is 9%-20%, for example, 10%, 12%, 14%, 16%, 18%, etc. If the content of the thermoplastic elastomer is less than 9%, the function of the thermoplastic elastomer cannot be effectively exerted; if the content of the thermoplastic elastomer is greater than 20%, the excessively high content of the thermoplastic elastomer cannot improve the performance of the warm-mix modified composite regeneration agent, but instead increases the hardness, affecting the subsequent use of the regenerated asphalt.

[0069] In some specific embodiments, the thermoplastic elastomer comprises a block copolymer of styrene and butadiene.

[0070] Specifically, in the present invention, the molar ratio of styrene to butadiene in the block copolymer of styrene and butadiene is 35-45:55-65, the volatile matter is less than 0.7%, the ash content is less than 0.2%, the tensile strength is greater than 24 MPa, the elongation at break is greater than 730%, and the melt flow rate is 0.1-0.3 g / (10 min).

[0071] stabilizer

[0072] The present invention enhances the compatibility between components by using a stabilizer, prevents stratification and segregation, inhibits asphalt aging, and prolongs the service life of the asphalt mixture.

[0073] In the present invention, based on the total mass of the warm-mix modified composite regeneration agent as 100%, the content of the stabilizer is 1%-3%, for example, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, etc. When the content of the stabilizer is less than 1%, the compatibility between the components cannot meet the requirements and the function of the stabilizer cannot be effectively exerted; when the content of the stabilizer is greater than 3%, the excessive amount of stabilizer increases the cost and cannot make the function more effective.

[0074] In some specific embodiments, the stabilizer includes zinc dimethyldithiocarbamate, which is a chemically cross-linked solid gray powder with an average particle size of about 0.05 to 0.1 mm.

[0075] Viscosity and drag reducing agents

[0076] The viscosity-reducing and drag-reducing agent of the present invention can reduce the high-temperature viscosity of aged asphalt, and is a key component for improving construction fluidity by reducing the viscosity of the asphalt system.

[0077] In the present invention, based on the total mass of the warm-mix modified composite regeneration agent as 100%, the content of the viscosity-reducing and drag-reducing agent is 10%-20%, for example, 12%, 14%, 16%, 18%, etc. When the content of the viscosity-reducing and drag-reducing agent is less than 10%, it cannot effectively reduce the high-temperature viscosity of aged asphalt; when the content of the viscosity-reducing and drag-reducing agent is too high, its effect is not fully exerted and the cost is increased.

[0078] In some specific embodiments, the viscosity reducing and drag reducing agent includes a fluorinated surfactant. Preferably, the fluorinated surfactant can be a perfluorohexanoate, for example, sodium perfluorohexanoate, potassium perfluorohexanoate and other commonly used perfluorohexanoates.

[0079] <Second Aspect>

[0080] The second aspect of the present invention provides a method for preparing the warm-mix modified composite regeneration agent according to the first aspect of the present invention, which comprises the step of mixing the components of the warm-mix modified composite regeneration agent.

[0081] Preferably, if Figure 1 As shown, the preparation method comprises the following steps:

[0082] Premixing a regenerating agent, a plasticizer and a thermoplastic elastomer to obtain a premix;

[0083] performing a shearing treatment on the premix to obtain a sheared product;

[0084] The sheared product is mixed with a stabilizer and then grown to obtain a grown product;

[0085] The developed product is mixed with a viscosity reducing and drag reducing agent to obtain a warm-mix modified composite regeneration agent.

[0086] In some specific embodiments, the pre-mixing temperature is 120-180°C. The present invention does not specifically limit the pre-mixing method, and the regeneration agent and the plasticizer and softener can be mixed first, and then mixed with the thermoplastic elastomer. The pre-mixing temperature is not specifically limited in the present invention and can be set as needed. It can generally be 120-180°C, for example, 125°C, 130°C, 135°C, 140°C, 145°C, 150°C, 155°C, 160°C, 165°C, 170°C, 175°C, etc.

[0087] The premix is sheared to obtain a sheared product. The shearing treatment allows the regeneration agent, plasticizer, softener, and thermoplastic elastomer, among other ingredients, to be more fully and evenly distributed in the premix, avoiding local component differences and ensuring the consistency of the final product's performance. The shearing treatment also helps improve the premix's physical properties, such as fluidity and plasticity, making it more suitable for subsequent processing operations such as molding, laying the foundation for obtaining a final product with good performance. In addition, the shearing treatment can also promote intermolecular interactions, allowing the molecules of the various ingredients to better contact and interact with each other, such as enhancing chemical bonding and physical adsorption, thereby positively affecting the mechanical properties and chemical stability of the product.

[0088] In some specific embodiments, the temperature of the shear treatment is 165-175°C, for example, 167°C, 169°C, 171°C, 173°C, etc.; the rate of the shear treatment is 3000-5000r / min, for example, 3500r / min, 4000r / min, 4500r / min, etc.; the time of the shear treatment is 20-120min, for example, 30min, 50min, 70min, 90min, 110min, etc. Further, the shear product is mixed with a stabilizer and then developed to obtain a developed product; through development, the shear product and the stabilizer can further interact and fuse, so that the system reaches a more stable and ideal state. Through the development process, the stabilizer can play a more full role, improve the stability, durability, processing performance, etc. of the shear product, so that the warm-mix modified composite regeneration agent has better performance to meet the needs of subsequent use scenarios.

[0089] In some specific embodiments, the development temperature is 165-175°C, for example, 167°C, 169°C, 171°C, 173°C, etc.; the development time is 20-120 min, for example, 30 min, 50 min, 70 min, 90 min, 110 min, etc.

[0090] Finally, the developed product is mixed with a viscosity-reducing and drag-reducing agent to obtain a warm-mix modified composite regeneration agent. The present invention does not specifically limit the mixing conditions, and the mixing can be performed as needed. Specifically, stirring can be used to achieve a more uniform mixing.

[0091] <Third Aspect>

[0092] The third aspect of the present invention provides a regenerated asphalt, which includes a warm-mix modified composite regeneration agent and waste asphalt; preferably, the content of the warm-mix modified composite regeneration agent is 5-25% based on the total mass of the waste asphalt as 100%.

[0093] Due to the addition of the warm-mix modified composite regeneration agent, the high-temperature stability, low-temperature crack resistance, durability and other indicators of the regenerated asphalt of the present invention can reach the new asphalt standards and can meet the needs of road construction.

[0094] Specifically, if Figure 2 As shown, the waste asphalt is heated to 120-160°C, a warm-mix modified composite regeneration agent is added, stirred at 1000-5000 r / min for 10-60 minutes, and then developed for 10-60 minutes to obtain the regenerated asphalt.

[0095] Example

[0096] The embodiments of the present invention will be described in detail below with reference to the examples, but it will be understood by those skilled in the art that the following examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention. Where specific conditions are not specified in the examples, the methods were performed according to conventional conditions or the conditions recommended by the manufacturer. Where the manufacturers of the reagents or instruments are not specified, they are all conventional products that can be obtained commercially.

[0097] The regeneration additive used in the embodiment is KLUTA AM-3 regeneration agent; wherein, the regeneration agent has a saturated content of 17.9%, an aromatic content of 68%, a colloid content of 1.51%, and a penetrating component content of 12.59%; a viscosity of 331 mPa·s at 60°C, a flash point of 245°C, and a relative density of 1.013 at 15°C.

[0098] In the embodiment, the molar ratio of styrene to butadiene of the block copolymer of styrene and butadiene is 40:60, the volatile matter is less than 0.7%, the ash content is less than 0.2%, the tensile strength is greater than 24 MPa, the elongation at break is greater than 730%, and the melt flow rate is 0.2 g / (10 min).

[0099] The average particle size of zinc dimethyldithiocarbamate was 0.08 mm.

[0100] Sodium perfluorohexanoate appears as a light yellow liquid with a cloud point of 75°C, a pH value of 6.2, and an active substance content of 62%.

[0101] Example 1

[0102] 1. Add 45% regeneration additive and 26% plasticizer softener cyclohexane at 140℃ and stir evenly.

[0103] 2. Raise the temperature to 165°C, add 15% styrene-butadiene block copolymer (SBS IC), and stir for 20 minutes.

[0104] 3. Raise the temperature to 170℃ and use a high-speed shear instrument to shear at a rate of 4000r / min for 60min.

[0105] 4. Add 2.5% stabilizer zinc dimethyldithiocarbamate and develop at 170℃ for 60 minutes.

[0106] 5. Finally, add 11.5% of the viscosity and drag reducing agent sodium perfluorohexanoate and stir evenly.

[0107] Example 2

[0108] 1. Add 55% regeneration additive and 20% plasticizer softener cyclohexane at 140℃ and stir evenly.

[0109] 2. Raise the temperature to 165°C, add 12% styrene-butadiene block copolymer (SBS IC), and stir for 20 minutes.

[0110] 3. Raise the temperature to 170℃ and use a high-speed shear instrument to shear at a rate of 4000r / min for 60min.

[0111] 4. Add 1.5% stabilizer zinc dimethyldithiocarbamate and develop at 170℃ for 60 minutes.

[0112] 5. Finally, add 11.5% of the viscosity and drag reducing agent sodium perfluorohexanoate and stir evenly.

[0113] Example 3

[0114] 1. Add 42% regeneration additive and 28% plasticizer softener cyclohexane at 140℃ and stir evenly.

[0115] 2. Raise the temperature to 165°C, add 13% styrene-butadiene block copolymer (SBS IC), and stir for 20 minutes.

[0116] 3. Raise the temperature to 170℃ and use a high-speed shear instrument to shear at a rate of 4000r / min for 60min.

[0117] 4. Add 3% stabilizer zinc dimethyldithiocarbamate and develop at 170℃ for 60 minutes.

[0118] 5. Finally, add 14% of the viscosity and drag reducing agent sodium perfluorohexanoate and stir evenly.

[0119] Example 4

[0120] 1. Add 58% regeneration additive and 19% plasticizer softener cyclohexane C6H at 140℃ 12 , stir well.

[0121] 2. Raise the temperature to 165°C, add 10% styrene-butadiene block copolymer (SBS IC), and stir for 20 minutes.

[0122] 3. Raise the temperature to 170℃ and use a high-speed shear instrument to shear at a rate of 4000r / min for 60min.

[0123] 4. Add 1% stabilizer zinc dimethyldithiocarbamate and develop at 170℃ for 60min.

[0124] 5. Finally, add 12% of the viscosity and drag reducing agent sodium perfluorohexanoate and stir evenly.

[0125] Example 5

[0126] 1. Add 43% regeneration additive and 26% plasticizer softener cyclohexane at 140℃ and stir evenly.

[0127] 2. Raise the temperature to 165°C, add 18% styrene-butadiene block copolymer (SBS IC), and stir for 20 minutes.

[0128] 3. Raise the temperature to 170℃ and use a high-speed shear instrument to shear at a rate of 4000r / min for 60min.

[0129] 4. Add 2.5% stabilizer zinc dimethyldithiocarbamate and develop at 170℃ for 60 minutes.

[0130] 5. Finally, add 10.5% of the viscosity and drag reducing agent sodium perfluorohexanoate and stir evenly.

[0131] Comparative Example 1

[0132] 1. Add 46% plasticizer and softener cyclohexane at 140℃ and stir evenly.

[0133] 2. Raise the temperature to 165°C, add 32% of styrene-butadiene block copolymer (SBSI-C), and stir for 20 minutes.

[0134] 3. Raise the temperature to 170℃ and use a high-speed shear instrument to shear at a rate of 4000r / min for 60min.

[0135] 4. Add 3% stabilizer zinc dimethyldithiocarbamate and develop at 170℃ for 60 minutes.

[0136] 5. Finally, add 19% of the viscosity and drag reducing agent sodium perfluorohexanoate and stir evenly.

[0137] Comparative Example 2

[0138] 1. Add 58% regeneration additive at 140℃ and stir evenly.

[0139] 2. Raise the temperature to 165°C, add 20% styrene-butadiene block copolymer (SBS IC), and stir for 20 minutes.

[0140] 3. Raise the temperature to 170℃ and use a high-speed shear instrument to shear at a rate of 4000r / min for 60min.

[0141] 4. Add 3% stabilizer zinc dimethyldithiocarbamate and develop at 170℃ for 60 minutes.

[0142] 5. Finally, add 19% of the viscosity and drag reducing agent sodium perfluorohexanoate and stir evenly.

[0143] Comparative Example 3

[0144] 1. Add 57% regeneration additive and 20% plasticizer softener cyclohexane at 140℃ and stir evenly.

[0145] 2. Raise the temperature to 165°C, add 10% styrene-butadiene block copolymer (SBS IC), and stir for 20 minutes.

[0146] 3. Raise the temperature to 170℃ and use a high-speed shear instrument to shear at a rate of 4000r / min for 60min.

[0147] 4. Finally, add 13% of the viscosity and drag reducing agent sodium perfluorohexanoate and stir evenly.

[0148] Application Examples

[0149] The waste asphalt was heated to 140° C., and the composite regeneration agents of Examples 1-5 and Comparative Examples 1-3 accounting for 10% of the mass of the waste asphalt were added respectively. The mixture was stirred at 4000 r / min for 30 minutes and then developed for 30 minutes to obtain the regenerated asphalt.

[0150] Performance Testing

[0151] The recycled asphalt in the application example was tested using JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering". The results are shown in Table 1 below.

[0152] Table 1

[0153]

[0154] It can be seen from Table 1 that the relevant properties of the regenerated asphalt in the examples all meet the requirements.

[0155] The 25°C needle penetration values of Examples 1-5 ranged from 64.4 to 79.1 (0.1 mm), all within the 60-80 (0.1 mm) range required by recycled asphalt technology. This indicates that the recycled asphalt in these examples has moderate hardness and good room-temperature construction and performance. In contrast, the needle penetration values of Comparative Examples 1 and 2 were 58.4 (0.1 mm) and 56.5 (0.1 mm), respectively, indicating that the asphalt was relatively hard, which was not conducive to construction and paving and pavement crack resistance.

[0156] The softening points of Examples 1-5 ranged from 55.3°C to 70.6°C, all meeting the technical requirement of ≥55°C. Examples 2 and 5 exhibited relatively high softening points, reaching 70.6°C and 69.2°C, respectively, demonstrating excellent high-temperature stability. Comparative Example 3, however, exhibited a softening point of only 52.1°C, and was susceptible to rutting and other defects at high temperatures.

[0157] The 5°C ductility reflects the asphalt's low-temperature crack resistance. Examples 1-5 exhibited 5°C ductility ranging from 36.1 to 48.7 cm, exceeding the technical requirement of ≥30 cm. This demonstrates that the recycled asphalt in these examples exhibits excellent flexibility and is less susceptible to cracking at low temperatures. However, the 5°C ductility of Comparative Examples 1 and 2, at 29.1 cm and 28.2 cm, respectively, suggests that low-temperature cracking may occur when used in cold regions, shortening the road's service life.

[0158] The 135°C dynamic viscosity reflects the fluidity of asphalt at construction temperature. The 135°C dynamic viscosities of Examples 1-5 ranged from 1144 to 2101 mPa·s, all meeting the requirement of ≤3000 mPa·s, ensuring good dispersion and paving performance during construction. The dynamic viscosity of Comparative Example 2 reached 3042 mPa·s, indicating poor fluidity at construction temperature, increasing construction difficulty and energy consumption.

[0159] The 25°C elastic recovery rate measures the elastic properties of asphalt. Examples 1-5 have elastic recovery rates of 77-85%, exceeding the technical requirement of ≥65%. This demonstrates that the regenerated asphalt in these examples can recover well after deformation and exhibits excellent fatigue resistance. Comparative Example 3 has an elastic recovery rate of only 63%, indicating that fatigue cracks may develop on the pavement over time.

[0160] In addition, in terms of quality change, Examples 1-5 are all controlled within 0.6-0.8%, meeting the requirement of ≤1%, indicating that the quality of the recycled asphalt in the examples is stable after the aging test and the durability is good.

[0161] It should be noted that, although the technical solutions of the present invention are described with specific examples, those skilled in the art will appreciate that the present invention should not be limited thereto.

[0162] While various embodiments of the present invention have been described above, the above descriptions are intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A warm mix modified composite regeneration agent, characterized in that: Taking the total mass of the warm-mix modified composite regeneration agent as 100%, Includes the following components: Regeneration additives: 40%-60%, Plasticizer: 20%-30%, Thermoplastic elastomer: 9%-20%, Stabilizer: 1%-3%, Viscosity reducing and drag reducing agent: 10%-20%.

2. The warm mix modified composite regeneration agent according to claim 1, characterized in that The regeneration additive includes saturates, aromas, colloids and penetrating components; wherein, based on the total mass of the regeneration additive being 100%, the content of the aromas is 5%-30%, the content of the saturates is 50%-80%, the content of the colloids is 0.5%-5%, and the content of the penetrating components is 5%-15%.

3. The warm mix modified composite regeneration agent according to claim 2, characterized in that The saturated fraction includes straight-chain alkanes, branched-chain alkanes and cyclic alkanes; the aromatic fraction includes aromatic hydrocarbons containing benzene rings or derivatives thereof.

4. The warm-mix modified composite regeneration agent according to any one of claims 1 to 3, characterized in that: The plasticizer and softener includes cycloalkyl rubber oil and / or cyclohexane.

5. The warm-mix modified composite regeneration agent according to any one of claims 1 to 4, characterized in that: The thermoplastic elastomer includes a block copolymer of styrene and butadiene.

6. The warm-mix modified composite regeneration agent according to any one of claims 1 to 5, characterized in that: The stabilizer includes zinc dimethyldithiocarbamate.

7. The warm-mix modified composite regeneration agent according to any one of claims 1 to 6, characterized in that: The viscosity and drag reducing agent includes a fluorine surfactant, preferably perfluorohexanoate.

8. A method for preparing a warm-mix modified composite regeneration agent according to any one of claims 1 to 7, characterized in that: The method comprises the steps of mixing the components of the warm-mix modified composite regeneration agent; Preferably, the preparation method comprises the following steps: Premixing a regenerating agent, a plasticizer and a thermoplastic elastomer to obtain a premix; performing a shearing treatment on the premix to obtain a sheared product; The sheared product is mixed with a stabilizer and then grown to obtain a grown product; The developed product is mixed with a viscosity reducing and drag reducing agent to obtain a warm-mix modified composite regeneration agent.

9. The preparation method according to claim 8, characterized in that The premixing temperature is 120-180° C.; and / or, The shearing treatment temperature is 165-175° C., the shearing treatment rate is 3000-5000 r / min, and the shearing treatment time is 20-120 min; and / or, The growth temperature is 165-175° C., and the growth time is 20-120 minutes.

10. A regenerated asphalt, characterized in that: The regenerated asphalt includes a warm-mix modified composite regeneration agent and waste asphalt; preferably, based on the total mass of the waste asphalt being 100%, the content of the warm-mix modified composite regeneration agent is 5-25%.

Images