CN112538274A - Low-grade modified asphalt suitable for rigid-flexible composite long-life pavement and preparation method thereof - Google Patents
Low-grade modified asphalt suitable for rigid-flexible composite long-life pavement and preparation method thereof Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 162
- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims description 12
- 239000000835 fiber Substances 0.000 claims abstract description 69
- 239000003607 modifier Substances 0.000 claims abstract description 32
- 239000011435 rock Substances 0.000 claims abstract description 32
- 239000002245 particle Substances 0.000 claims abstract description 28
- 239000000919 ceramic Substances 0.000 claims abstract description 25
- 239000011159 matrix material Substances 0.000 claims abstract description 25
- 229920005594 polymer fiber Polymers 0.000 claims abstract description 25
- 239000003381 stabilizer Substances 0.000 claims abstract description 19
- 229920000098 polyolefin Polymers 0.000 claims abstract description 10
- 238000010008 shearing Methods 0.000 claims description 30
- 241000196324 Embryophyta Species 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 7
- 238000011161 development Methods 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 239000003208 petroleum Substances 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 229920002748 Basalt fiber Polymers 0.000 claims description 3
- 239000005062 Polybutadiene Substances 0.000 claims description 3
- 229920002857 polybutadiene Polymers 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000010902 straw Substances 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 2
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 2
- 229920002943 EPDM rubber Polymers 0.000 claims description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 229920002522 Wood fibre Polymers 0.000 claims description 2
- 239000011425 bamboo Substances 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 239000002025 wood fiber Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 2
- 241001330002 Bambuseae Species 0.000 claims 1
- 229910052631 glauconite Inorganic materials 0.000 claims 1
- 210000000582 semen Anatomy 0.000 claims 1
- 239000010410 layer Substances 0.000 abstract description 17
- 239000004567 concrete Substances 0.000 abstract description 5
- 239000002344 surface layer Substances 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 3
- 239000011229 interlayer Substances 0.000 abstract description 3
- 230000018109 developmental process Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000010298 pulverizing process Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
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- 244000080767 Areca catechu Species 0.000 description 1
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- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
A low-grade modified asphalt suitable for a rigid-flexible composite long-life pavement comprises the following components in parts by weight: 50-80 parts of matrix asphalt, 15-30 parts of natural asphalt, 0.5-2 parts of ceramic particles, 1-4 parts of polyolefin modifier, 1-4 parts of natural rock fiber, 0.5-2 parts of natural plant fiber, 0.5-2 parts of polymer fiber and 1.5-6 parts of stabilizer. The low-grade modified asphalt can obviously enhance the high-temperature stability and viscosity of an asphalt surface layer, and can avoid the problem of poor low-temperature crack resistance of low-grade asphalt; the asphalt layer is applied to the rigid-flexible composite pavement, so that the anti-rutting capability of the asphalt layer can be greatly improved, the interlayer combination between the asphalt layer and the concrete layer can be obviously enhanced, and a brand new thought can be provided for the design of the high-performance rigid-flexible composite long-life pavement.
Description
Technical Field
The invention belongs to the technical field of modified asphalt, and particularly relates to low-grade modified asphalt suitable for a rigid-flexible composite long-life pavement and a preparation method thereof.
Background
With the rapid development of highway construction in China, the rigid-flexible composite long-life pavement is widely applied with excellent performance. In the existing research, the requirement for the service life of the concrete layer is mainly emphasized. However, with the increasing road traffic volume, the vehicle axle load is increasingly heavy, and the requirement on the service life of the asphalt layer in the rigid-flexible composite long-life pavement is also increasingly high. The asphalt layer in the rigid-flexible composite long-life pavement is easy to generate main diseases such as ruts, cracks, looseness and the like. In order to reduce the asphalt layer diseases, the use performance of the asphalt material needs to be comprehensively improved.
The low-grade asphalt has poor low-temperature performance, fatigue resistance and other performances, is easy to generate cracks under the action of low temperature or heating, influences the service performance of the asphalt pavement, and is not used for preparing an asphalt surface course in the current practice; if the low-grade asphalt can be effectively utilized in the asphalt surface layer, a brand new idea can be provided for the construction of the rigid-flexible composite long-service-life pavement.
Disclosure of Invention
The invention mainly aims to solve the problems and the defects in the prior art, and provides low-grade modified asphalt suitable for a rigid-flexible composite long-life pavement, which can obviously enhance the high-temperature stability and the viscosity of an asphalt surface layer and simultaneously avoid the problem of poor low-temperature crack resistance of the low-grade asphalt; the asphalt layer is applied to the rigid-flexible composite pavement, so that the anti-rutting capability of the asphalt layer can be greatly improved, the interlayer combination between the asphalt layer and the concrete layer can be obviously enhanced, and a brand new thought can be provided for the design of the high-performance rigid-flexible composite long-life pavement.
In order to achieve the purpose, the invention adopts the technical scheme that:
a low-grade modified asphalt suitable for a rigid-flexible composite long-life pavement comprises the following components in parts by weight: 50-80 parts of matrix asphalt, 15-30 parts of natural asphalt, 0.5-2 parts of ceramic particles, 1-4 parts of polyolefin modifier, 1-4 parts of natural rock fiber, 0.5-2 parts of natural plant fiber, 0.5-2 parts of polymer fiber and 1.5-6 parts of stabilizer.
In the scheme, the matrix asphalt is No. 30 common petroleum asphalt or No. 10 petroleum asphalt.
In the scheme, the natural rock fiber is one or a mixture of basalt fiber and volcanic fiber.
In the scheme, the natural plant fiber is one or more of areca nut fiber, straw fiber, wood fiber and bamboo fiber.
In the scheme, the polymer fiber is one or more of polyester fiber, polyethylene fiber and polypropylene fiber.
In the scheme, the length of the natural rock fiber, the length of the plant fiber and the length of the polymer fiber are 6-30 mm, and the diameter of the natural rock fiber, the length of the plant fiber and the diameter of the polymer fiber are 20-50 micrometers.
In the scheme, the natural asphalt is one or more of albanian rock asphalt, irane rock asphalt, Qingchuan rock asphalt and Buton rock asphalt.
In the scheme, the stabilizer is one or more of ethylene propylene diene monomer rubber powder, butadiene rubber powder and styrene butadiene rubber powder.
In the scheme, the polyolefin modifier is a sasobide modifier and the like.
In the scheme, the particle size of the ceramic particles is 0.5-3 mu m.
The invention also provides a preparation method of the modified asphalt suitable for the rigid-flexible composite long-life pavement, which comprises the following steps:
1) weighing the raw materials according to the proportion, wherein the components in parts by weight comprise: 50-80 parts of matrix asphalt, 15-30 parts of natural asphalt, 0.5-2 parts of ceramic particles, 1-4 parts of polyolefin modifier, 1-4 parts of natural rock fiber, 0.5-2 parts of natural plant fiber, 0.5-2 parts of polymer fiber and 1.5-6 parts of stabilizer;
2) adding the blocky natural asphalt into a grinder, grinding, sieving, then doping the blocky natural asphalt and polymer fibers into matrix asphalt, and developing at a certain temperature;
3) adding a polyolefin modifier into the mixture obtained in the step 2), and carrying out high-speed shearing;
4) adding ceramic particles, natural plant fibers, natural rock fibers and a stabilizer into the shearing product obtained in the step 3), and shearing at high speed again until the asphalt is uniform and stable to obtain the composite modified asphalt.
In the scheme, the development temperature in the step 2) is 175-190 ℃, and the development time is 50-80 min.
In the scheme, the high-speed shearing temperature in the step 3) is 145-160 ℃, the shearing rate is 3000-4500 r/min, and the time is 30-60 min.
In the scheme, the high-speed shearing temperature in the step 4) is 120-135 ℃, the shearing rate is 3000-4500 r/min, and the time is 30-60 min.
The principle of the invention is as follows:
the invention adopts low-grade asphalt as matrix asphalt for the first time and applies the matrix asphalt to the preparation of an asphalt surface layer, and aims at the problems of poor low-temperature performance, poor fatigue resistance and the like of the low-grade asphalt, the invention improves and combines composite fibers, ceramic particles and natural asphalt to modify, wherein the composite fibers comprise rock fibers, plant fibers and polymer fibers, and have the characteristics of high strength, high toughness and high compatibility, the invention can obviously reduce the diseases of cracking, loosening and the like of the asphalt layer, enhance the low-temperature crack resistance of the asphalt surface layer, simultaneously the introduced ceramic particles can effectively reduce the temperature sensitivity of the asphalt, can absorb heat under the high-temperature environment, emit heat under the low-temperature environment, and simultaneously improve the high-temperature stability and the low-temperature crack resistance of the obtained asphalt system; the introduced natural asphalt can further improve the compatibility among matrix asphalt, ceramic particles and fibers, effectively improve the segregation phenomenon after mixing and further improve the stability of the obtained modified asphalt and asphalt mixture; the low-grade pitch that introduces in addition can show the high temperature stability and the stickness of reinforcing asphalt surface course, in hard and soft composite pavement, can improve the anti rutting ability on asphalt layer by a wide margin, can show the interlayer combination between reinforcing asphalt layer and the concrete simultaneously, further promotes asphalt layer and concrete layer and forms stable whole, the whole life on reinforcing road surface.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention adopts low-grade asphalt as matrix asphalt, and further combines composite fiber, ceramic particles and natural asphalt, so that the problems of poor low-temperature crack resistance and the like of the low-grade asphalt and the compatibility between the fiber, the ceramic particles and the matrix asphalt can be effectively improved, and the high-temperature stability and the fatigue resistance of the low-grade matrix asphalt can be fully exerted; the use performance of the matrix asphalt can be comprehensively improved, and a brand new thought is provided for the design of a high-performance rigid-flexible composite long-life pavement;
2) the composite modified asphalt has the advantages of low cost, simple preparation process, stable property, uniform material quality and long service life, and is suitable for popularization and application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following examples, the base asphalt used was No. 30 natural asphalt; the natural asphalt is Albanian rock asphalt; the ceramic particles are road ceramic particles, and the particle size of the road ceramic particles is 0.5-3 mu m;
the adopted natural rock fiber is natural basalt fiber; the natural plant fiber is straw fiber, and the polymer fiber is polyester fiber; wherein the fiber length is 6-30 mm, and the diameter is 20-50 μm; the polyolefin modifier is a sasobide modifier, and the stabilizer is butadiene rubber powder.
Example 1
The modified asphalt suitable for the rigid-flexible composite long-life pavement comprises the following components in parts by weight: 80 parts of matrix asphalt, 15 parts of natural asphalt, 0.5 part of ceramic particles, 1 part of natural rock fiber, 1 part of a shasobide modifier, 0.5 part of natural plant fiber, 0.5 part of polymer fiber and 1.5 parts of a stabilizer;
the preparation method comprises the following steps:
1) adding the blocky natural asphalt into a pulverizer, pulverizing and sieving to obtain a natural asphalt modifier;
2) mixing the obtained natural asphalt modifier and polymer fiber into matrix asphalt, putting into a 175 ℃ oven, and taking out after the natural asphalt modifier and the polymer fiber develop for 50 min;
3) adding a Sasobide modifier into the mixture obtained in the step 2), and shearing for 30min at the speed of 3000r/min within the temperature range of 145 ℃ by adopting a high-speed shearing instrument;
4) and (3) adding ceramic particles, natural plant fibers, natural rock fibers and a stabilizer into the mixture obtained in the step 3), shearing for 30min at a speed of 3000r/min within a temperature range of 120 ℃ by using a high-speed shearing instrument until the asphalt is uniform and stable, and cooling to obtain the composite modified asphalt with a smooth surface.
Example 2
The modified asphalt suitable for the rigid-flexible composite long-life pavement comprises the following components in parts by weight: 70 parts of matrix asphalt, 20 parts of natural asphalt, 1 part of ceramic particles, 2 parts of natural rock fiber, 2 parts of a shasobide modifier, 1 part of natural plant fiber, 1 part of polymer fiber and 3 parts of a stabilizer;
the preparation method comprises the following steps:
1) adding the blocky natural asphalt into a pulverizer, pulverizing and sieving to obtain a natural asphalt modifier;
2) mixing the obtained natural asphalt modifier and polymer fiber into matrix asphalt, putting into a 180 ℃ oven, and taking out after the natural asphalt modifier and the polymer fiber develop for 60 min;
3) adding a Sasobide modifier into the mixture obtained in the step 2), and shearing for 40min at a speed of 3500r/min within a temperature range of 150 ℃ by adopting a high-speed shearing instrument;
4) and (3) adding ceramic particles, natural plant fibers, natural rock fibers and a stabilizer into the mixture obtained in the step 3), shearing the mixture at a speed of 3500r/min for 40min by using a high-speed shearing instrument within a temperature range of 120 ℃ until the asphalt is uniform and stable, and cooling the mixture until the surface of the asphalt is smooth to obtain the composite modified asphalt.
Example 3
The modified asphalt suitable for the rigid-flexible composite long-life pavement comprises the following components in parts by weight: 60 parts of matrix asphalt, 25 parts of natural asphalt, 1.5 parts of ceramic particles, 3 parts of natural rock fiber, 3 parts of a Sasobide modifier, 1.5 parts of natural plant fiber, 1.5 parts of polymer fiber and 4.5 parts of a stabilizer;
the preparation method comprises the following steps:
1) adding the blocky natural asphalt into a pulverizer, pulverizing and sieving to obtain a natural asphalt modifier;
2) mixing the obtained natural asphalt modifier and polymer fiber into matrix asphalt, putting into a 185 ℃ oven, and taking out after development for 70 min;
3) adding a Sasobide modifier into the mixture obtained in the step 2), and shearing for 50min at the speed of 4000r/min within the temperature range of 155 ℃ by adopting a high-speed shearing instrument;
4) and (3) adding ceramic particles, natural plant fibers, natural rock fibers and a stabilizer into the mixture obtained in the step 3), shearing for 50min at the speed of 4000r/min within the temperature range of 130 ℃ by using a high-speed shearing instrument until the asphalt is uniform and stable, and cooling to obtain the composite modified asphalt with a smooth surface.
Example 4
The modified asphalt suitable for the rigid-flexible composite long-life pavement comprises the following components in parts by weight: 50 parts of matrix asphalt, 30 parts of natural asphalt, 2 parts of ceramic particles, 4 parts of natural rock fiber, 4 parts of a shasobide modifier, 2 parts of natural plant fiber, 2 parts of polymer fiber and 6 parts of a stabilizer;
the preparation method comprises the following steps:
1) adding the blocky natural asphalt into a pulverizer, pulverizing and sieving to obtain a natural asphalt modifier;
2) mixing the obtained natural asphalt modifier and polymer fiber into matrix asphalt, putting into a baking oven at 190 ℃ for development for 80min, and taking out;
3) adding a Sasobide modifier into the mixture obtained in the step 2), and shearing for 60min at the speed of 4500r/min by a high-speed shearing instrument within the temperature range of 160 ℃;
4) and (3) adding ceramic particles, natural plant fibers, natural rock fibers and a stabilizer into the mixture obtained in the step 3), shearing for 60min at a speed of 4500r/min by using a high-speed shearing instrument within a temperature range of 135 ℃ until the asphalt is uniform and stable, and cooling to obtain the composite modified asphalt with a smooth surface.
In order to verify the use performance of the composite modified asphalt, No. 70 asphalt is taken as a comparison group 1; no. 30 asphalt was used as control 2; the No. 30 asphalt is doped with composite fibers to serve as a control group 3, wherein the control group 3 comprises the following components in parts by weight: 95.5 parts of matrix asphalt, 1 part of natural rock fiber, 1 part of a sasobit modifier, 0.5 part of natural plant fiber, 0.5 part of polymer fiber and 1.5 parts of a stabilizer;
the examples prepared by the present invention are experimental groups, and the test results of the relevant items are shown in table 1.
Table 1 results of testing Properties of modified asphalts obtained in examples 1 to 4
The equivalent softening point, the equivalent brittle point, the penetration ratio and the aging index in the table are calculated according to the calculation method described in road engineering asphalt and asphalt mixture test protocol (JTG E20-2011), and the high-temperature and low-temperature continuous grading temperatures of the asphalt grade (PG) are calculated according to the continuous grading temperature of the performance-graded (PG) asphalt binder and the standard operation protocol of continuous grading
(astm d7643) the calculation method described. Equivalent softening point and asphalt grade (PG) high-temperature continuous grading temperature are asphalt high-temperature performance indexes; the higher the equivalent softening point and the high temperature continuous classification temperature of asphalt grade (PG), the better the high temperature performance of asphalt. The equivalent brittle point and the low-temperature continuous grading temperature of asphalt grade (PG) are indexes of low-temperature performance of asphalt; the lower the equivalent brittle point and the low temperature continuous classification temperature of asphalt grade (PG), the better the low temperature performance of asphalt. The penetration ratio and the aging index are asphalt durability indexes; the higher the penetration ratio, the lower the aging index, and the better the asphalt durability.
The results show that the modified asphalt prepared in the embodiments 1 to 4 has better service performance compared with the matrix asphalt, and the related preparation process is simple, the raw materials are low in price, and the application prospect is wide.
It is apparent that the above embodiments are only examples for clearly illustrating and do not limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are therefore intended to be included within the scope of the invention as claimed.
Claims (10)
1. The low-grade modified asphalt suitable for the rigid-flexible composite long-life pavement is characterized by comprising the following components in parts by weight: 50-80 parts of matrix asphalt, 15-30 parts of natural asphalt, 0.5-2 parts of ceramic particles, 1-4 parts of polyolefin modifier, 1-4 parts of natural rock fiber, 0.5-2 parts of natural plant fiber, 0.5-2 parts of polymer fiber and 1.5-6 parts of stabilizer.
2. The low-grade modified asphalt according to claim 1, wherein the base asphalt is a No. 30 common petroleum asphalt or a No. 10 common petroleum asphalt.
3. The low-grade modified asphalt according to claim 1, wherein the natural rock fiber is one or a mixture of basalt fiber and volcanic fiber; the natural plant fiber is one or more of Arecae semen fiber, straw fiber, wood fiber, and bamboo fiber; the polymer fiber is one or more of polyester fiber, polyethylene fiber and polypropylene fiber.
4. The low-grade modified asphalt according to claim 1, wherein the natural rock fibers, the plant fibers and the polymer fibers have a length of 6 to 30mm and a diameter of 20 to 50 μm.
5. The low-grade modified asphalt according to claim 1, wherein the natural asphalt is one or more of albania rock asphalt, irannate rock asphalt, glauconite rock asphalt and buton rock asphalt.
6. The low-grade modified asphalt according to claim 1, wherein the stabilizer is one or more of ethylene propylene diene monomer rubber powder, butadiene rubber powder and styrene butadiene rubber powder; the polyolefin modifier is a sasobide modifier.
7. The low-grade modified asphalt according to claim 1, wherein the ceramic particles have a particle size of 0.5 to 3 μm
8. The method for preparing the low-grade modified asphalt suitable for the rigid-flexible composite long-life pavement as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps:
1) weighing the raw materials according to the proportion, wherein the components in parts by weight comprise: 50-80 parts of matrix asphalt, 15-30 parts of natural asphalt, 0.5-2 parts of ceramic particles, 1-4 parts of polyolefin modifier, 1-4 parts of natural rock fiber, 0.5-2 parts of natural plant fiber, 0.5-2 parts of polymer fiber and 1.5-6 parts of stabilizer;
2) adding the blocky natural asphalt into a grinder, grinding, sieving, then doping the blocky natural asphalt and polymer fibers into matrix asphalt, and developing at a certain temperature;
3) adding a polyolefin modifier into the mixture obtained in the step 2), and carrying out high-speed shearing;
4) adding ceramic particles, natural plant fibers, natural rock fibers and a stabilizer into the shearing product obtained in the step 3), and shearing at high speed again until the asphalt is uniform and stable to obtain the composite modified asphalt.
9. The method according to claim 8, wherein the development temperature in step 2) is 175-190 ℃ for 50-80 min.
10. The preparation method of claim 8, wherein the high-speed shearing temperature in the step 3) is 145-160 ℃, the shearing rate is 3000-4500 r/min, and the time is 30-60 min; in the step 4), the high-speed shearing temperature is 120-135 ℃, the shearing rate is 3000-4500 r/min, and the time is 30-60 min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113214660A (en) * | 2021-04-22 | 2021-08-06 | 江阴市新远见工程有限公司 | Waterproof wear-resistant regenerated asphalt and preparation method thereof |
| CN113897069A (en) * | 2021-11-05 | 2022-01-07 | 周其强 | Carbene modified asphalt and preparation method thereof |
| CN114716838A (en) * | 2022-04-26 | 2022-07-08 | 中冶南方城市建设工程技术有限公司 | Waste mask modified asphalt suitable for long-life pavement and preparation method thereof |
| CN117645796A (en) * | 2023-11-09 | 2024-03-05 | 杭州联嘉沥青砼有限公司 | Asphalt and preparation method thereof |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113214660B (en) * | 2021-04-22 | 2022-08-02 | 江阴市新远见工程有限公司 | Waterproof wear-resistant regenerated asphalt and preparation method thereof |
| CN113897069A (en) * | 2021-11-05 | 2022-01-07 | 周其强 | Carbene modified asphalt and preparation method thereof |
| CN114716838A (en) * | 2022-04-26 | 2022-07-08 | 中冶南方城市建设工程技术有限公司 | Waste mask modified asphalt suitable for long-life pavement and preparation method thereof |
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