CN114316614A - Multifunctional asphalt mixture modifier prepared from renewable resources and preparation method thereof - Google Patents
Multifunctional asphalt mixture modifier prepared from renewable resources and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a multifunctional asphalt mixture modifier prepared from renewable resources and a preparation method thereof, wherein the multifunctional asphalt mixture modifier is composed of the following components in percentage by mass: 65-80% of recycled Polyethylene (PE), 5-10% of recycled rubber powder, 3-8% of recycled polypropylene (PP), 2-5% of recycled polyvinyl chloride (PVC), 6-30% of reinforcing agent and 10-30% of auxiliary agent. The multifunctional asphalt mixture modifier disclosed by the invention ingeniously utilizes the unique properties of various renewable resources, is an externally-doped polyolefin composite modifier, is directly added into a mixing cylinder of an asphalt mixture mixing plant, integrally modifies the mixture by a one-step method, abandons the step of asphalt modification, saves a large amount of energy consumption and is convenient to use.
Description
Technical Field
The invention belongs to the field of new materials for highway traffic construction, and relates to a multifunctional asphalt mixture modifier prepared from renewable resources.
Background
With the increasing of economic strength of China, particularly the increasing of investment on infrastructure construction in China in recent years, the highway construction of China is developed dramatically. Asphalt pavements have also been widely used and account for the vast majority of high-grade highways that have been built. When the asphalt road is developed rapidly, the problem of early damage of the asphalt road surface, particularly the damage of high-temperature ruts, is the most prominent, and the serious road surface diseases such as high-temperature ruts, low-temperature cracks and the like are also generated in the south and the north.
The asphalt mixture is a mixture of coarse and fine aggregates with a certain gradation and a proper amount of asphalt binder, which are fully mixed under proper conditions. With the increase of road traffic volume, the increase of traffic load and the deterioration of climate environment, the requirements of road construction, maintenance and reconstruction projects on road materials are higher and higher, the common matrix asphalt mixture road materials cannot meet the requirements of the existing traffic conditions, and the modified asphalt mixture is more and more widely applied due to the excellent road performance.
The traditional modified asphalt mixture is based on modified asphalt technology, and is a cementing material prepared by fully mixing a certain-grade coarse and fine aggregate and a proper amount of SBS modified asphalt binder under a certain condition. The modified asphalt is asphalt cement prepared by adding rubber, resin high molecular polymer, ground rubber powder or other externally-doped modifiers to improve the road performance of the asphalt. At present, modified asphalt has two production methods: firstly, the modified asphalt is manufactured on site and is butted with an asphalt mixture mixing plant, the storage stability of the modified asphalt is not considered in the mode, the production process is convenient to monitor, the yield is low, one mixer needs one modified asphalt site production device, and the cost performance is low; the second method is finished modified asphalt, which has the advantage of stable quality but is limited by the conditions of transport tank cars, storage equipment and the like. The defects of the traditional modified asphalt are as follows: the traditional technical scheme of firstly producing modified asphalt and then producing modified asphalt mixture has some technical, environmental and economic bottlenecks and disadvantages: (1) asphalt is easy to age, and the durability of asphalt pavement is affected. (2) Segregation and delamination easily occur between the modifier and the asphalt after long-term storage, and the service performance of the modified asphalt is seriously influenced; (3) high cost and large equipment investment. The production of modified asphalt needs special production equipment which comprises a shearing machine or a colloid mill with high price, the occupied area is large, and basic facilities such as a production workshop and the like need to be built; (4) the energy consumption is high, the production, storage and transportation of the modified asphalt are realized at higher temperature, and a large amount of heat energy is needed for maintenance; (5) and (4) discharging harmful gases. The heating temperature is 180-200 ℃ in the production process of the modified asphalt, and the asphalt can emit certain harmful gas at high temperature, thereby causing adverse effects on construction environment and operators.
The invention skillfully utilizes the unique properties of different polyolefin regenerated resources, optimizes the optimal proportion of various raw materials, and plays a role in enhancing, cooperating and compositely modifying. The multifunctional asphalt mixture modifier with the functions of improving high-temperature stability, low-temperature crack resistance, water damage resistance and fatigue resistance is prepared by premixing, mixing, melting, extruding, cutting into granules and air drying. The modified asphalt mixture technology is based on the common asphalt mixture production technology, the multifunctional asphalt mixture modifier is directly added into a mixing cylinder of a mixing plant to integrally modify the matrix asphalt mixture in one step without adding more mechanical equipment or changing the traditional production technology, and the aim of improving the pavement performance of the asphalt mixture is fulfilled. Compared with the traditional modified asphalt mixture technology, the external-doping type multifunctional modified asphalt mixture technology has the characteristics of energy conservation, environmental protection, convenient construction, convenient storage and transportation and easy quality control, is also a waste comprehensive utilization, recycling economy and carbon emission reduction technology which is mainly supported by China, has good market popularization and application prospects, and is a new trend of low-carbon material application technology. In the modified asphalt mixture technology, a direct-throwing modifier is the core of the technology and has high requirements on the performance of the direct-throwing modifier. The anti-rutting agent which is put into use in the market at present is a type of novel modified asphalt mixture modifier, and mainly focuses on improving and preventing the rutting diseases of asphalt pavements and improving the high-temperature anti-rutting performance of asphalt mixtures. The multifunctional modified asphalt mixture not only needs to improve the high-temperature performance of the asphalt mixture, but also considers the low-temperature performance and the water loss resistance of the asphalt mixture, and needs to perform systematic research and development on the raw material proportion, the modification performance and the application method of the asphalt mixture modifier product, so that the direct-vat multifunctional modified asphalt mixture modification technology is realized.
Disclosure of Invention
The invention aims to provide a multifunctional asphalt mixture modifier prepared from renewable resources and a preparation method thereof, and also provides an application method of the multifunctional asphalt mixture modifier. The multifunctional asphalt mixture modifier is prepared by skillfully utilizing the unique properties of various polyolefin regenerated resources and preferably selecting the optimal proportion. The multifunctional asphalt mixture modifier is directly put into a mixing cylinder of a mixing plant to realize synchronous mixing and modification, the asphalt mixture is integrally modified, the produced modified asphalt mixture can comprehensively improve the high-temperature stability, the low-temperature stability and the water damage resistance of the asphalt mixture, and the comprehensive road performance is superior to that of the traditional modified asphalt mixture.
In order to achieve the purpose, the invention adopts the technical scheme that: a multifunctional asphalt mixture modifier prepared from renewable resources comprises the following components in percentage by mass: 65-80% of recycled Polyethylene (PE), 5-10% of recycled rubber powder, 3-8% of recycled polypropylene (PP), 2-5% of recycled polyvinyl chloride (PVC), 6-30% of reinforcing agent and 10-30% of auxiliary agent, wherein the sum of the weight of the raw materials is 100%.
Further: the reinforcing agent comprises: 20-40% of styrene-butadiene-styrene block copolymer resin (SBS), 20-40% of Polyurethane (PU), 10-20% of dilauryl thiodipropionate (DLTP) and 25-77015% of light stabilizer.
Further: the auxiliary agent comprises: polyethylene wax (PE wax) 5-15%, nano calcium carbonate powder (CaCO)3) 15% -30% of Chlorinated Polyethylene (CPE) 5% -up to15 percent, 5 to 15 percent of ethylene-vinyl acetate copolymer (EVA), 5 to 15 percent of Ethylene Bis Stearamide (EBS) and 15 to 30 percent of color masterbatch.
Further: the recycled Polyethylene (PE) comprises at least one or a mixture of more of low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), modified polyethylene (CPE), chemically crosslinked polyethylene (XPE), EPE (EPE) and ethylene-vinyl acetate copolymer (EVA), and the density of the recycled Polyethylene (PE) is 0.9-1.0 g/cm3The particle size is 0.3 to 6 mm.
In recycling, the film is not limited to recycling of greenhouse films, recycling of food films, recycling of polyethylene plastic pipes and plastic products, and recycling of scrap.
Further: the recycled rubber powder is one or more of recycled tire rubber powder, recycled rubber tube rubber powder, recycled rubber shoe powder and recycled leftover rubber powder, and the fineness of the recycled rubber powder is 10-80 meshes.
The preparation method of the modifier comprises the following steps:
(1) weighing and preparing materials: weighing according to the component proportion: 65-80% of recycled Polyethylene (PE), 5-10% of recycled rubber powder, 3-8% of recycled polypropylene (PP), 2-5% of recycled polyvinyl chloride (PVC), 6-30% of reinforcing agent and 10-30% of auxiliary agent;
wherein the reinforcing agent comprises: 20-40% of styrene-butadiene-styrene block copolymer resin (SBS), 20-40% of Polyurethane (PU), 10-20% of dilauryl thiodipropionate (DLTP) and 25% of light stabilizer UV-77015%;
the auxiliary agent comprises the following components in percentage by mass: polyethylene wax (PE wax) 5-15%, nano calcium carbonate powder (CaCO)3)15 to 30 percent of Chlorinated Polyethylene (CPE), 5 to 15 percent of ethylene-vinyl acetate copolymer (EVA), 5 to 15 percent of Ethylene Bis Stearamide (EBS) and 15 to 30 percent of color master batch.
(2) Premixing: putting the weighed components into a mixer, stirring and premixing for 30 min;
(3) and (3) granulation: and adding the uniformly mixed component mixture into a screw extruder, and mixing, melting, extruding, granulating and air-drying at 125-185 ℃ to obtain the columnar or flaky multifunctional asphalt mixture modifier. Wherein the length-diameter ratio of the extruded screw is 28: 1-35: 1; the heating temperature of the eight zones of the machine barrel is 125-180 ℃, the vacuum degree is 0-0.75 Mpa, and the rotating speed of the screw is 55-130 r/min.
Secondly, the method for preparing the modified asphalt mixture by using the multifunctional asphalt mixture modifier comprises the following steps:
(1) and calculating the aggregate dosage of various specifications according to the designed grading proportion, and accurately batching. The asphalt mixture comprises aggregate, a modifier and petroleum asphalt; the aggregate comprises aggregate and mineral powder.
(2) Adding the aggregate into a mixing cylinder of a mixing plant, heating to 175-185 ℃, and adding a multifunctional asphalt mixture modifier by manpower or a batch feeder, wherein the addition amount of the modifier accounts for 0.3-0.6% of the mass of the asphalt mixture;
(3) ensuring that the multifunctional asphalt mixture modifier and the aggregate have dry mixing time of 5-10s, and adding petroleum asphalt with the temperature of 150-160 ℃ after the aggregate is dry mixed for 60 s;
(4) continuously stirring for 60s, and then adding mineral powder; then mixing for 60 s;
(5) the total mixing time is 180s, the mixing temperature is 175 ℃, the discharging temperature of the asphalt mixture molding is controlled at 160-170 ℃, and the finished modified asphalt mixture can be prepared.
Thirdly, the technical index requirements of the multifunctional asphalt mixture modifier are as follows:
(1) physical and chemical technical index requirements of modifier
(2) Technical index requirements of modified mixture
The addition amount of the direct-vat multifunctional asphalt mixture modifier accounts for 0.3-0.6% of the mass of the asphalt mixture, and under the conditions that the grading design is reasonable and the indexes of aggregate and asphalt meet the corresponding standard requirements:
| item | 70# matrix asphalt + (0.3-0.6%) direct-throwing multifunctional modifier |
| Degree of dynamic stability (times/mm) | ≥8000 |
| Marshall residual stability (%) | ≥85 |
| Freeze-thaw split tensile strength ratio (%) | ≥80 |
| Trabecular bending failure strain (mu epsilon) | ≥2800 |
(3) Technical index requirements of fatigue test
The fatigue resistance of the mixture doped with the modifier is evaluated by adopting a four-point bending fatigue test. The plate test piece is manufactured according to the method of vibration wheel milling forming, and the size of the formed test plate is 400mm multiplied by 300mm multiplied by 75 mm. And cutting the rolled test plate into a standard four-point bending small beam test piece with the length of 385 +/-5 mm, the height of 50mm +/-6 mm and the width of 63mm +/-6 mm by using a stone cutter. Specific fatigue life indices are as follows:
asphalt mixture fatigue life technical index requirement of multifunctional asphalt mixture modifier
The invention has the technical effects that:
(1) the multifunctional asphalt mixture modifier disclosed by the invention ingeniously utilizes the unique properties of various renewable resources, is an externally-doped polyolefin composite modifier, is directly added into a mixing cylinder of an asphalt mixture mixing plant, integrally modifies the mixture by a one-step method, abandons the step of asphalt modification, saves a large amount of energy consumption and is convenient to use.
(2) The raw material components of the multifunctional asphalt mixture modifier provided by the invention take polyethylene as a main component, and the waste of polyethylene plastic products is an internationally recognized white pollutant, so that the waste amount is large, and the recovery resources are rich. The polyethylene belongs to thermoplastic resin materials, can be melted into deformable fluid under the condition of exceeding the Vicat temperature of the polyethylene, and can achieve the purpose of improving the high-temperature anti-rutting performance of the asphalt mixture through the mutual modification effect with the asphalt mixture. But the polyethylene has no improvement effect on the low-temperature performance and other performances of the asphalt mixture.
(3) The other main raw material component of the multifunctional asphalt mixture modifier is recycled rubber powder which is a rubber component subjected to surface modification, and the low-temperature crack resistance of the asphalt mixture can be obviously improved.
(4) The modified asphalt mixture of the invention is composed of asphalt, aggregate and modifier, the asphalt component can effectively connect the polyethylene component and the rubber powder component together through the physical and chemical action to form a rubber-plastic composite material, and the multifunctional modification for simultaneously improving the high-temperature performance and the low-temperature performance is formed. The prepared modified asphalt mixture has excellent performance, and reaches or exceeds the technical specification requirements of the existing related modified asphalt mixture.
(5) The reinforcing agents SBS resin and polyurethane are used for further supplementing and improving the modification of polyethylene and rubber powder, and the high-temperature performance, the low-temperature performance and the fatigue resistance of the asphalt mixture are greatly improved through composite modification;
(6) the antioxidant dilauryl thiodipropionate (DLTP) improves the oxidation resistance of the asphalt; the light stabilizer UV-770 improves the stability of the asphalt against ultraviolet light; by using No. 70 matrix asphalt, a contrast test is carried out on the asphalt penetration, softening point and ductility change of the residue and new asphalt through an asphalt film heating test (TFOT) and an asphalt rotating film heating test (RTFOT), so that the asphalt aging can be greatly improved, and the service life of the asphalt is prolonged.
(7) The multifunctional asphalt mixture modifier is added into an asphalt mixture in the application process, the modifier is quickly softened when being added during high-temperature dry mixing of aggregates, so that the molten state is reached, the molten modifier is uniformly dispersed into the mixture in a finer and more uniform state through the strong shearing force of the aggregates, and the modification performance of the multifunctional asphalt mixture modifier is better exerted and the comprehensive performance of the asphalt mixture is improved through the action mechanisms of softening, melting, tackifying, modifying and the like.
(8) Under the condition of the same strain value, the fatigue life of the mixture doped with the multifunctional asphalt mixture modifier is longer than that of the conventional modified asphalt mixture, and the fatigue life ratio of the mixture doped with the modifier to the conventional modified asphalt mixture is increased along with the increase of the strain value, which shows that the reduction range of the fatigue life of the mixture doped with the modifier is reduced along with the increase of the strain value.
(9) The multifunctional asphalt mixture modifier is black particles, has stable performance at normal temperature, is easy to store, and overcomes the defects of difficult transportation, long-term storage, segregation and layering compared with modified asphalt.
(10) The externally-doped multifunctional asphalt mixture modifier is convenient to use, energy-saving and environment-friendly, and compared with the traditional modified asphalt mixture, the coal can be saved by 44kg when one ton of modified asphalt mixture is produced, the carbon dioxide emission can be reduced by 166kg, the sulfur dioxide emission can be reduced by 4.5kg, and the nitride emission can be reduced by 0.65 kg. Is a green road material with low carbon, environmental protection and economy, and has wide market popularization and application prospect.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
weighing 73kg of recovered low-density polyethylene, 8kg of recovered rubber powder, 2kg of SBS resin, 1.5kg of polyurethane, 0.8kg of dilauryl thiodipropionate (DLTP) and 0.5kg of light stabilizer UV-770; 0.8kg of polyethylene Wax (PE Wax PR700), 6kg of nano calcium carbonate powder, 0.8kg of Chlorinated Polyethylene (CPE), 1kg of ethylene-vinyl acetate copolymer (EVA), 0.6kg of Ethylene Bis Stearamide (EBS) and 5kg of polyethylene color master batch.
Adding the materials into a mixer, premixing uniformly, adding into a hopper of a screw extruder, and preparing into multifunctional asphalt mixture modifier particles through the processes of mixing, melting, extruding, bracing, granulating, air drying and the like.
The detection result of the physical and chemical indexes of the prepared multifunctional asphalt mixture modifier is as follows:
heating the aggregate with the AC-20 type gradation to 175-185 ℃, adding the heated aggregate into a mixing tank of a mixing plant according to the designed gradation proportion, simultaneously adding the multifunctional asphalt mixture modifier prepared in the embodiment 1, wherein the addition amount of the modifier accounts for 0.3 percent of the mass of the asphalt mixture, mixing for 25 seconds, adding No. 70 matrix petroleum asphalt with the temperature of 160 ℃, mixing for 15 seconds, then adding mineral powder, and mixing for 15 seconds to prepare the modified asphalt mixture. The discharging temperature of the modified asphalt mixture is 170 ℃, the paving temperature is 160 ℃, and the rolling temperature is 140 ℃.
The performance index detection result of the modified asphalt mixture is as follows:
the modified asphalt mixture adopts the four-point bending fatigue test anti-fatigue performance result:
example 2:
weighing 70kg of recovered low-density polyethylene, 10kg of recovered rubber powder, 2.5kg of SBS resin, 2kg of polyurethane, 0.8kg of dilauryl thiodipropionate (DLTP) and 0.5kg of light stabilizer UV-770; 0.8kg of polyethylene Wax (PE Wax PR700), 6kg of nano calcium carbonate powder, 0.8kg of Chlorinated Polyethylene (CPE), 1kg of ethylene-vinyl acetate copolymer (EVA), 0.6kg of Ethylene Bis Stearamide (EBS) and 5kg of polyethylene color master batch.
Adding the materials into a mixer, premixing uniformly, adding into a hopper of a screw extruder, and preparing into multifunctional asphalt mixture modifier particles through the processes of mixing, melting, extruding, bracing, granulating, air drying and the like.
The detection result of the physical and chemical indexes of the prepared multifunctional asphalt mixture modifier is as follows:
| item | Technical index |
| Appearance form | Columnar particles |
| Colour(s) | Black color |
| Particle size (mm) | 3.65 |
| Water content (%) | 0.21 |
| Density (g/cm3) | 0.92 |
| Softening Point (. degree. C.) | 139 |
Heating the aggregate with the AC-20 type gradation to 175-185 ℃, adding the heated aggregate into a mixing tank of a mixing plant according to the designed gradation proportion, simultaneously adding the multifunctional asphalt mixture modifier prepared in the embodiment 1, wherein the addition amount of the modifier accounts for 0.4 percent of the mass of the asphalt mixture, mixing for 25 seconds, adding No. 70 matrix petroleum asphalt with the temperature of 160 ℃, mixing for 15 seconds, then adding mineral powder, and mixing for 15 seconds to prepare the modified asphalt mixture. The discharging temperature of the modified asphalt mixture is 170 ℃, the paving temperature is 160 ℃, and the rolling temperature is 140 ℃.
The performance index detection result of the modified asphalt mixture is as follows:
the modified asphalt mixture adopts the four-point bending fatigue test anti-fatigue performance result:
example 3:
77kg of recovered low-density polyethylene, 6.5kg of recovered rubber powder, 2kg of SBS resin, 2kg of polyurethane, 0.6kg of dilauryl thiodipropionate (DLTP) and 0.5kg of light stabilizer UV-770 are weighed; 0.3kg of polyethylene Wax (PE Wax PR700), 4kg of nano calcium carbonate powder, 0.5kg of Chlorinated Polyethylene (CPE), 0.5kg of ethylene-vinyl acetate copolymer (EVA), 0.4kg of Ethylene Bis Stearamide (EBS) and 5.7kg of polyethylene color master batch.
Adding the materials into a mixer, premixing uniformly, adding into a hopper of a screw extruder, and preparing into multifunctional asphalt mixture modifier particles through the processes of mixing, melting, extruding, bracing, granulating, air drying and the like.
The detection result of the physical and chemical indexes of the prepared multifunctional asphalt mixture modifier is as follows:
| item | Technical index |
| Appearance form | Columnar particles |
| Colour(s) | Black color |
| Particle size (mm) | 3.7 |
| Water content (%) | 0.13 |
| Density (g/cm3) | 0.94 |
| Softening Point (. degree. C.) | 138.5 |
Heating the aggregate with the AC-20 type gradation to 175-185 ℃, adding the heated aggregate into a mixing tank of a mixing plant according to the designed gradation proportion, simultaneously adding the multifunctional asphalt mixture modifier prepared in the embodiment 1, wherein the addition amount of the modifier accounts for 0.5 percent of the mass of the asphalt mixture, mixing for 25 seconds, adding No. 70 matrix petroleum asphalt with the temperature of 160 ℃, mixing for 15 seconds, then adding mineral powder, and mixing for 15 seconds to prepare the modified asphalt mixture. The discharging temperature of the modified asphalt mixture is 170 ℃, the paving temperature is 160 ℃, and the rolling temperature is 140 ℃.
The performance index detection result of the modified asphalt mixture is as follows:
the modified asphalt mixture adopts the four-point bending fatigue test anti-fatigue performance result:
it will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (6)
1. The multifunctional asphalt mixture modifier prepared from renewable resources is characterized in that: the composition comprises the following components in percentage by mass: 65-80% of recycled Polyethylene (PE), 5-10% of recycled rubber powder, 3-8% of recycled polypropylene (PP), 2-5% of recycled polyvinyl chloride (PVC), 6-30% of reinforcing agent and 10-30% of auxiliary agent, wherein the sum of the weight of the raw materials is 100%.
2. The modifier according to claim 1, wherein: the reinforcing agent comprises: 20-40% of styrene-butadiene-styrene block copolymer resin (SBS), 20-40% of Polyurethane (PU), 10-20% of dilauryl thiodipropionate (DLTP) and 25-77015% of light stabilizer.
3. The modifier according to claim 1, wherein: the auxiliary agent comprises: polyethylene wax (PE wax) 5-15%, nano calcium carbonate powder (CaCO)3)15 to 30 percent of Chlorinated Polyethylene (CPE), 5 to 15 percent of ethylene-vinyl acetate copolymer (EVA), 5 to 15 percent of Ethylene Bis Stearamide (EBS) and 15 to 30 percent of color master batch.
4. The modifier according to claim 1, wherein: the recycled Polyethylene (PE) comprises at least one or a mixture of more of low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), modified polyethylene (CPE), chemically crosslinked polyethylene (XPE), EPE (EPE) and ethylene-vinyl acetate copolymer (EVA), and the density of the recycled Polyethylene (PE) is 0.9-1.0 g/cm3The particle size is 0.3 to 6 mm.
5. The modifier according to claim 1, wherein: the recycled rubber powder is one or more of recycled tire rubber powder, recycled rubber tube rubber powder, recycled rubber shoe powder and recycled leftover rubber powder, and the fineness of the recycled rubber powder is 10-80 meshes.
6. The process for producing the modifier according to any one of claims 1 to 5, wherein: mixing the materials according to the mass percentage, adding the mixture into a premix machine, uniformly mixing the materials, conveying the mixture to a screw extruder, and preparing asphalt mixture modifier particles through the working procedures of shearing, mixing, melting, extruding, bracing and granulating; wherein the length-diameter ratio of the screw extruded by the screw is 28: 1-35: 1; the heating temperature of the eight zones of the machine barrel is 125-180 ℃, the vacuum degree is 0-0.75 Mpa, and the rotating speed of the screw is 55-130 r/min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115677268A (en) * | 2022-11-07 | 2023-02-03 | 山东高速工程检测有限公司 | Quick-melting type regenerated asphalt mixture modifier, regenerated asphalt mixture and preparation method thereof |
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| CN106280504A (en) * | 2016-08-05 | 2017-01-04 | 武汉理工大学 | A kind of premix copoly type Asphalt mixture compound modifier and preparation method thereof |
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| CN104861676A (en) * | 2015-06-11 | 2015-08-26 | 山东大学 | Waste superpolymer based comprehensive asphaltic-mixture modifier and preparation method and application thereof |
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