CN112538274B - Low-grade modified asphalt suitable for rigid-flexible composite long-service-life pavement and preparation method thereof - Google Patents
Low-grade modified asphalt suitable for rigid-flexible composite long-service-life pavement and preparation method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 33
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- 239000003607 modifier Substances 0.000 claims abstract description 30
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- 239000011435 rock Substances 0.000 claims abstract description 25
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- 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 28
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- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 1
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Classifications
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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
-
- 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
-
- 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
-
- 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
-
- 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
Abstract
The low-grade modified asphalt suitable for the 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 disclosed by the invention 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 can be applied to rigid-flexible composite pavement, so that the rutting resistance 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 pavement with long service life.
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 the excellent performance. In the prior art, the requirement for the service life of the concrete layer is mainly emphasized. However, as road traffic increases, vehicle axle loads continue to increase, and the requirements for the service life of asphalt layers in rigid-flexible composite long-life pavements continue to increase. Asphalt layers in rigid-flexible composite long-life pavements are prone to main types of diseases such as ruts, cracks and looseness. In order to reduce the diseases of the asphalt layer, the usability of the asphalt material needs to be comprehensively improved.
The low-temperature performance, fatigue resistance and other performances of the low-grade asphalt are poor, cracks are easily generated under the low-temperature or heating action, the service performance of the asphalt pavement is affected, and the low-grade asphalt is not used for preparing an asphalt surface layer 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 constructing the rigid-flexible composite long-life pavement.
Disclosure of Invention
Aiming at the problems and the defects existing in the prior art, the invention provides the low-grade modified asphalt suitable for the rigid-flexible composite long-service-life pavement, which can obviously enhance the high-temperature stability and the viscosity of an asphalt surface layer and can avoid the problem of poor low-temperature crack resistance of the low-grade asphalt; the asphalt layer can be applied to rigid-flexible composite pavement, so that the rutting resistance 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 pavement with long service life.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the low-grade modified asphalt suitable for the 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 above 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 betel nut fiber, straw fiber, wood fiber and bamboo fiber.
In the above scheme, the polymer fiber is one or more of polyester fiber, polyethylene fiber and polypropylene fiber.
In the scheme, the lengths of the natural rock fiber, the plant fiber and the polymer fiber are 6-30 mm, and the diameters are 20-50 mu m.
In the above scheme, the natural asphalt is one or more of albania rock asphalt, illite 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 above scheme, the polyolefin modifier is a salubide modifier or the like.
In the above embodiment, the ceramic particles have a particle diameter of 0.5 to 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 comprise 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) Adding massive natural asphalt into a pulverizer, pulverizing, sieving, and then mixing the massive natural asphalt with 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 sheared product obtained in the step 3), and shearing again at a high speed until the asphalt is uniform and stable, thus obtaining 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:
according to the invention, low-grade asphalt is adopted as matrix asphalt for the first time and is applied to the preparation of an asphalt surface layer, and the problems of low-temperature performance, poor fatigue resistance and the like of the low-grade asphalt are solved; the introduced natural asphalt can further improve compatibility among matrix asphalt, ceramic particles and fibers, effectively improve segregation phenomenon after mixing, and further improve stability of the obtained modified asphalt and asphalt mixture; in addition, the introduced low-grade asphalt can obviously enhance the high-temperature stability and viscosity of the asphalt surface layer, can greatly improve the rutting resistance of the asphalt layer in a rigid-flexible composite pavement, can obviously enhance the interlayer combination between the asphalt layer and concrete, further promotes the asphalt layer and the concrete layer to form a stable whole, and prolongs the whole service life of the pavement.
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 low-temperature crack resistance and the like of the low-grade asphalt and the compatibility among the fiber, the ceramic particles and the matrix asphalt can be effectively improved, and the high-temperature stability and fatigue resistance of the low-grade matrix asphalt can be fully exerted; the usability of the matrix asphalt can be comprehensively and comprehensively improved, and a brand new idea is provided for the design of the 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 and long service life, and is suitable for popularization and application.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the following examples, the matrix asphalt used was No. 30 natural asphalt; the natural asphalt is Abanite asphalt; the ceramic particles are road ceramic particles with the particle size of 0.5-3 mu m;
the natural rock fiber is natural basalt fiber; the natural plant fiber is straw fiber, and the polymer fiber is polyester fiber; wherein the length of the fiber is 6-30 mm, and the diameter is 20-50 mu m; the polyolefin modifier is a Saxifragan 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 Saxifragde modifier, 0.5 part of natural plant fiber, 0.5 part of polymer fiber and 1.5 parts of stabilizer;
the preparation method comprises the following steps:
1) Adding the massive natural asphalt into a pulverizer, pulverizing, and sieving to obtain a natural asphalt modifier;
2) The obtained natural asphalt modifier and polymer fibers are mixed into matrix asphalt, and are put into an oven at 175 ℃ to develop for 50min and then taken out;
3) Adding Sha Suobi De-modifier into the mixture obtained in the step 2), and shearing for 30min at a speed of 3000r/min at a temperature of 145 ℃ by using a high-speed shearing instrument;
4) 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 at a temperature range of 120 ℃ by adopting a high-speed shearing instrument until the asphalt is uniform and stable, and obtaining the composite modified asphalt when the asphalt is cooled and has 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 fibers, 2 parts of a Saxifragde modifier, 1 part of natural plant fibers, 1 part of polymer fibers and 3 parts of a stabilizer;
the preparation method comprises the following steps:
1) Adding the massive natural asphalt into a pulverizer, pulverizing, and sieving to obtain a natural asphalt modifier;
2) The obtained natural asphalt modifier and polymer fibers are mixed into matrix asphalt, and are put into a baking oven at 180 ℃ for 60min to develop and then taken out;
3) Adding Sha Suobi De-modifier into the mixture obtained in the step 2), and shearing at 3500r/min for 40min at 150 ℃ by a high-speed shearing instrument;
4) Adding ceramic particles, natural plant fibers, natural rock fibers and a stabilizer into the mixture obtained in the step 3), shearing at 3500r/min for 40min at the temperature range of 120 ℃ by adopting a high-speed shearing instrument until the asphalt is uniform and stable, and obtaining the composite modified asphalt when the asphalt is cooled and has smooth surface.
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 fibers, 3 parts of a Saxifragde modifier, 1.5 parts of natural plant fibers, 1.5 parts of polymer fibers and 4.5 parts of a stabilizer;
the preparation method comprises the following steps:
1) Adding the massive natural asphalt into a pulverizer, pulverizing, and sieving to obtain a natural asphalt modifier;
2) The obtained natural asphalt modifier and polymer fibers are mixed into matrix asphalt, and the matrix asphalt is put into an oven at 185 ℃ to develop for 70min and then taken out;
3) Adding Sha Suobi De-modifier into the mixture obtained in the step 2), and shearing at 4000r/min for 50min at 155 ℃ by a high-speed shearing instrument;
4) 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 at the temperature of 130 ℃ by adopting a high-speed shearing instrument until the asphalt is uniform and stable, and obtaining the composite modified asphalt when the asphalt is cooled and has 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 fibers, 4 parts of a sand soider modifier, 2 parts of natural plant fibers, 2 parts of polymer fibers and 6 parts of a stabilizer;
the preparation method comprises the following steps:
1) Adding the massive natural asphalt into a pulverizer, pulverizing, and sieving to obtain a natural asphalt modifier;
2) The obtained natural asphalt modifier and polymer fibers are mixed into matrix asphalt, and are put into an oven at 190 ℃ to develop for 80 minutes and then taken out;
3) Adding Sha Suobi De-modifier into the mixture obtained in the step 2), and shearing at 4500r/min for 60min at 160 ℃ by a high-speed shearing instrument;
4) 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 at a temperature of 135 ℃ by adopting a high-speed shearing instrument until asphalt is uniform and stable, and cooling to form a smooth surface, thereby obtaining the composite modified asphalt.
In order to verify the service performance of the composite modified asphalt, no. 70 asphalt is used as a control group 1; asphalt No. 30 is control group 2; the asphalt No. 30 is doped with composite fibers as a control group 3, wherein the control group 3 comprises the following components in percentage by weight: 95.5 parts of matrix asphalt, 1 part of natural rock fiber, 1 part of a Saxidoeder modifier, 0.5 part of natural plant fiber, 0.5 part of polymer fiber and 1.5 parts of stabilizer;
the examples prepared by the invention are experimental groups, and related projects are tested, and the test results are shown in table 1.
TABLE 1 results of Performance test of modified asphalt obtained in examples 1 to 4
The equivalent softening point, equivalent brittle point, penetration ratio and aging index in the above table are calculated according to the calculation method described in the test procedure of asphalt and asphalt mixture for Highway engineering (JTG E20-2011), and the high-temperature and low-temperature continuous classification temperature of asphalt grade (PG) is calculated according to the standard operation procedure of continuous classification temperature and continuous classification of asphalt binder for measuring Performance classification (PG)
(astm d 7643) calculation method. The equivalent softening point and the high-temperature continuous grading temperature of the asphalt grade (PG) 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 points and the low-temperature continuous grading temperature of the asphalt grade (PG) are asphalt low-temperature performance indexes; 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 examples 1-4 has better use performance than matrix asphalt, and the preparation process is simple, the raw materials are low in cost, and the application prospect is wide.
It is apparent that the above examples are only examples given for clarity of illustration and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And thus obvious variations or modifications to the disclosure are within the scope of the invention.
Claims (5)
1. The low-grade modified asphalt suitable for the rigid-flexible composite long-service-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;
the matrix asphalt is 30 # common petroleum asphalt;
the natural asphalt is Abanite asphalt;
the polymer fiber is polyester fiber;
the lengths of the natural rock fibers, the plant fibers and the polymer fibers are 6-30 mm, and the diameters of the natural rock fibers, the plant fibers and the polymer fibers are 20-50 mu m;
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 salubide modifier;
the particle size of the ceramic particles is 0.5-3 mu m.
2. The low grade modified asphalt of 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 and bamboo fiber.
3. The method for preparing the low-grade modified asphalt suitable for the rigid-flexible composite long-life pavement as claimed in claim 1 or 2, which is characterized by comprising the following steps:
1) Weighing the raw materials according to the proportion, wherein the components comprise 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) Adding massive natural asphalt into a pulverizer, pulverizing, sieving, and then mixing the massive natural asphalt with 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 sheared product obtained in the step 3), and shearing again at a high speed until the asphalt is uniform and stable, thus obtaining the composite modified asphalt.
4. A method according to claim 3, wherein the development temperature in step 2) is 175-190 ℃ for 50-80 min.
5. The method according to claim 3, wherein the high-speed shearing temperature in step 3) is 145-160 ℃, the shearing rate is 3000-4500 r/min, and the time is 30-60 min; 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.
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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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| EP1375596A1 (en) * | 2002-06-19 | 2004-01-02 | Minebea Co., Ltd. | Road paving material |
| CN103360773A (en) * | 2013-07-18 | 2013-10-23 | 华南理工大学 | Composite asphalt modifier, its preparation method and application |
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