CN112142401A - Upper-layer asphalt mixture of amphibole pavement and preparation method thereof - Google Patents
Upper-layer asphalt mixture of amphibole pavement and preparation method thereof Download PDFInfo
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- CN112142401A CN112142401A CN202010948912.7A CN202010948912A CN112142401A CN 112142401 A CN112142401 A CN 112142401A CN 202010948912 A CN202010948912 A CN 202010948912A CN 112142401 A CN112142401 A CN 112142401A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/10—Clay
- C04B14/104—Bentonite, e.g. montmorillonite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/30—Oxides other than silica
- C04B14/305—Titanium oxide, e.g. titanates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/18—Waste materials; Refuse organic
- C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
- C04B18/26—Wood, e.g. sawdust, wood shavings
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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 invention discloses a bituminous mixture for an upper surface layer of a amphibole pavement and a preparation method thereof, wherein the bituminous mixture consists of SBS modified asphalt and mineral aggregate, the oilstone ratio of the modified bituminous mixture is 4.7-4.8%, and the SBS modified asphalt comprises the following raw materials in parts by weight: 90-100 parts of matrix asphalt, 8-10 parts of SBS modifier and nano TiO22-3 parts of organic montmorillonite, 1-2 parts of organic montmorillonite and 0.5-1 part of modified fiber; the mineral aggregate comprises the following raw materials in parts by weight: 60-70 parts of coarse aggregate, 30-35 parts of fine aggregate, 0-2 parts of mineral powder and 1-3 parts of cement, wherein the coarse aggregate is the amphibole macadam. The invention uses nano TiO2The composite modification of the organic montmorillonite improves the resistance of SBS modified asphalt to light and heat composite aging, the tensile strength and the shear strength of the asphalt mixture are improved by adding the modified fiber, and the invention takes the amphibole crushed stone as the coarse aggregate in the asphalt mixture, and the performance index of the asphalt mixture prepared according to the ore material grade and the oilstone ratio of the invention meets various requirements of the upper layer of the pavement, thereby providing a new stone material raw material for the preparation of the asphalt mixture.
Description
Technical Field
The invention relates to the field of asphalt mixtures, in particular to an asphalt mixture for an upper layer of a amphibole pavement and a preparation method thereof.
Background
The asphalt pavement has good service performance and comfortable driving performance. However, asphalt pavements still have some problems in use. In the service process of the road, the asphalt material is influenced by natural factors such as light, heat, water and the like, the asphalt material is hardened and aged, so that the low-temperature cracking resistance of the asphalt pavement is gradually reduced, the bonding force between the asphalt material and a base material is weakened, pavement diseases such as cracking, material accumulation stripping and the like are finally generated, the service performance and the driving comfort performance of the road are reduced, and the service life of the road is greatly influenced. In order to improve the road performance of the asphalt pavement, a modified material is added into the matrix asphalt to become a development trend, wherein the SBS modified asphalt is widely applied to paving of the asphalt pavement due to excellent high and low temperature performance, but is easy to generate thermal oxygen and ultraviolet light aging under the action of factors such as heat, light, oxygen and the like in the construction and service processes, and directly influences the road performance and the service life of the asphalt pavement.
The asphalt mixture is prepared by manually mixing mineral aggregate (crushed stone or gravel, stone chips or sand, mineral powder, etc.) with a certain gradation composition with a certain proportion of road asphalt material under strictly controlled conditions. The strength of asphalt mixtures is mainly manifested in two aspects. The first is the adhesive force of the cementing material formed by asphalt and mineral powder; the other is the internal friction and the locking force among the aggregate particles. The huge surface area of the fine mineral powder particles (mostly smaller than 0.074 mm) enables the asphalt material to form a film, thereby improving the bonding strength and the temperature stability of the asphalt material; while the locking forces are mainly generated between the coarse aggregate particles.
At present, diabase or basalt aggregate is commonly used for preparing an asphalt mixture on the upper surface layer of modified asphalt in the process of paving a highway, but diabase and basalt in partial regions cannot meet the requirements of pavement engineering, so that stone transportation is expensive, and nonacidic local stone cannot be effectively utilized.
Disclosure of Invention
In order to solve the defects mentioned in the background technology, the invention aims to provide an asphalt mixture on the upper layer of the amphibole pavement and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
the modified asphalt mixture for the upper layer of the amphibole pavement consists of SBS modified asphalt and mineral aggregate, wherein the oilstone ratio of the modified asphalt mixture is 4.7-4.8%, and the SBS modified asphalt comprises the following raw materials in parts by weight: 90-100 parts of matrix asphalt, 8-10 parts of SBS modifier and nano TiO22-3 parts of organic montmorillonite, 1-2 parts of organic montmorillonite and 0.5-1 part of modified fiber;
the mineral aggregate comprises the following raw materials in parts by weight: 60-70 parts of coarse aggregate, 30-35 parts of fine aggregate, 0-2 parts of mineral powder and 1-3 parts of cement, wherein the coarse aggregate is amphibole macadam;
preferably, the modified fiber is a wood fiber surface-modified by organosilane, and the wood fiber has a diameter of 0.5-2 mm and a length of 50-100 mm.
Preferably, the coarse aggregates are classified into # 1 coarse aggregates, # 2 coarse aggregates and # 3 coarse aggregates according to particle size, the particle size of the # 1 coarse aggregates is 9.5-16mm, the particle size of the # 2 coarse aggregates is 4.75-9.5mm, and the particle size of the # 3 coarse aggregates is 2.36-4.75 mm.
Preferably, the fine aggregate is limestone machine-made sand, and the particle size of the fine aggregate is 0-2.36 mm.
Preferably, the cement is ordinary portland cement.
Preferably, the mineral powder is limestone mineral powder, and the particle size of the mineral powder is 0.075-0.15 mm.
Preferably, the mineral aggregate is graded as: 100 percent of 16mm sieve pores, 94-100 percent of 13.2mm sieve pores, 68-78 percent of 9.5mm sieve pores, 32-45 percent of 4.75mm sieve pores, 22-35 percent of 2.36mm sieve pores, 8-12 percent of 1.18mm sieve pores, 10-19 percent of 0.6mm sieve pores, 7-14 percent of 0.3mm sieve pores, 5-10 percent of 0.15mm sieve pores and 4-8 percent of 0.075mm sieve pores.
A preparation method of a modified asphalt mixture for an upper layer of a amphibole pavement comprises the following steps:
s1: selecting large-block flash rock rubble with good forming and little weathered soft stone, crushing, screening and drying to obtain coarse aggregates with different particle sizes, adding the coarse aggregates, the fine aggregates, the mineral powder and the cement into a mixing plant according to a ratio, heating to 175-fold sand-adding temperature and 180 ℃, and uniformly stirring and mixing to obtain hot mineral aggregate;
s2: heating the asphalt substrate to 160-180 ℃ to ensure that the substrate asphalt is in a molten state, adding SBS modifier and nano TiO2Mixing, shearing and grinding the organic montmorillonite, inoculating at 180 ℃ for 1-1.5h at 170 ℃ and adding the modified fiber, and stirring and mixing uniformly to obtain SBS modified asphalt;
s3: and adding the SBS modified asphalt into the hot mineral aggregate, and uniformly stirring and mixing to obtain a modified asphalt mixture.
Preferably, in step S1, a multistage crushing process of impact breaking, cone breaking, impact breaking and shaping is adopted, and the inclination angle of the sieve plate of the vibrating sieve for aggregate processing is controlled to be 23-25 °.
Preferably, the step S2 is performed by using a high shear emulsifying machine, wherein the rotation speed is 3000-.
The invention has the beneficial effects that:
1. the asphalt mixture consists of SBS modified asphalt and mineral aggregate containing amphibole coarse aggregate, and nanometer TiO is used to prepare the asphalt mixture2The resistance of SBS modified asphalt to light and heat compound aging is improved comprehensively by compound modification of the organic montmorillonite, the tensile strength and the shear strength of the asphalt mixture are improved by adding the modified fiber, and the damage of reflection cracks from the base layer to the pavement surface layer can be prevented;
2. the method takes the amphibole macadam as the coarse aggregate in the asphalt mixture, and the performance index of the asphalt mixture prepared according to the mineral aggregate grade and the oilstone ratio meets various requirements of the upper layer of the pavement, thereby providing a new stone raw material for preparing the asphalt mixture.
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.
In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
In the embodiment of the invention, the modified fiber is wood fiber subjected to surface modification by organosilane, the diameter of the wood fiber is 0.5-2 mm, and the length of the wood fiber is 50-100 mm.
The coarse aggregate is the amphibole macadam, the coarse aggregate is divided into 1# coarse aggregate, 2# coarse aggregate and 3# coarse aggregate according to the grain size, the grain size of the 1# coarse aggregate is 9.5-16mm, the grain size of the 2# coarse aggregate is 4.75-9.5mm, and the grain size of the 3# coarse aggregate is 2.36-4.75 mm; the fine aggregate is limestone machine-made sand, the cement with the particle size of 0-2.36mm is ordinary portland cement mineral powder, and the mineral powder has the particle size of 0.075-0.15 mm.
The grading condition of the stone mineral aggregate in the embodiment of the invention is shown in the following table 1:
example 1
The modified asphalt mixture for the upper layer of the amphibole pavement consists of SBS modified asphalt and mineral aggregate, wherein the oilstone ratio of the modified asphalt mixture is 4.7 percent, and the SBS modified asphalt comprises the following raw materials in parts by weight: 95 parts of matrix asphalt, 8 parts of SBS modifier and nano TiO22 parts of organic montmorillonite, 1 part of organic montmorillonite and 0.6 part of modified fiber;
the mineral aggregate comprises the following raw materials in parts by weight: 70 parts of coarse aggregate, 34 parts of fine aggregate, 2 parts of mineral powder and 3 parts of cement;
the preparation method of the modified asphalt mixture for the upper layer of the amphibole pavement comprises the following steps:
s1: selecting large-block flash rock rubble with good forming and little weathered soft stone, crushing, screening and drying to obtain coarse aggregates with different particle sizes, adding the coarse aggregates, the fine aggregates, the mineral powder and the cement into a mixing plant according to a ratio, heating to 175 ℃, and uniformly stirring and mixing to obtain hot mineral aggregate;
s2: heating asphalt substrate to 170 deg.C to make the substrate asphalt be in molten state, adding SBS modifier and nano TiO2Mixing, shearing and grinding the organic montmorillonite, inoculating the mixture for 1h at 175 ℃, adding the modified fiber, stirring and mixing uniformly to obtain SBS modified asphalt;
s3: and adding the SBS modified asphalt into the hot mineral aggregate, and uniformly stirring and mixing to obtain a modified asphalt mixture.
Example 2
The modified asphalt mixture for the upper layer of the amphibole pavement consists of SBS modified asphalt and mineral aggregate, wherein the oilstone ratio of the modified asphalt mixture is 4.8 percent, and the SBS modified asphalt comprises the following raw materials in parts by weight: 100 parts of base asphalt, 10 parts of SBS modifier and nano TiO23 parts of organic montmorillonite, 1 part of modified fiber and 1 part of organic montmorillonite;
the mineral aggregate comprises the following raw materials in parts by weight: 65 parts of coarse aggregate, 32 parts of fine aggregate, 1 part of mineral powder and 2 parts of cement;
the preparation method of the modified asphalt mixture for the upper layer of the amphibole pavement comprises the following steps:
s1: selecting large-block flash rock rubble with good forming and little weathered soft stone, crushing, screening and drying to obtain coarse aggregates with different particle sizes, adding the coarse aggregates, the fine aggregates, the mineral powder and the cement into a mixing plant according to a ratio, heating to 175 ℃, and uniformly stirring and mixing to obtain hot mineral aggregate;
s2: heating asphalt substrate to 170 deg.C to make the substrate asphalt be in molten state, adding SBS modifier and nano TiO2Mixing, shearing and grinding the organic montmorillonite, inoculating the mixture for 1 hour at 180 ℃, adding the modified fiber, stirring and mixing uniformly to obtain SBS modified asphalt;
s3: and adding the SBS modified asphalt into the hot mineral aggregate, and uniformly stirring and mixing to obtain a modified asphalt mixture.
Example 3
A kind ofThe modified asphalt mixture of the upper layer of the amphibole pavement consists of SBS modified asphalt and mineral aggregate, the oilstone ratio of the modified asphalt mixture is 4.7 percent, and the SBS modified asphalt comprises the following raw materials in parts by weight: 95 parts of matrix asphalt, 8 parts of SBS modifier and nano TiO22 parts of organic montmorillonite, 1 part of organic montmorillonite and 0.8 part of modified fiber;
the mineral aggregate comprises the following raw materials in parts by weight: 65 parts of coarse aggregate, 35 parts of fine aggregate, 1.5 parts of mineral powder and 2 parts of cement;
the preparation method of the modified asphalt mixture for the upper layer of the amphibole pavement comprises the following steps:
s1: selecting large-block flash rock rubble with good forming and little weathered soft stone, crushing, screening and drying to obtain coarse aggregates with different particle sizes, adding the coarse aggregates, the fine aggregates, the mineral powder and the cement into a mixing plant according to a ratio, heating to 175 ℃, and uniformly stirring and mixing to obtain hot mineral aggregate;
s2: heating asphalt substrate to 180 deg.C to make the substrate asphalt be in molten state, adding SBS modifier and nano TiO2Mixing, shearing and grinding the organic montmorillonite, inoculating for 1.5h at 180 ℃, adding the modified fiber, stirring and mixing uniformly to obtain SBS modified asphalt;
s3: and adding the SBS modified asphalt into the hot mineral aggregate, and uniformly stirring and mixing to obtain a modified asphalt mixture.
Example 4
The modified asphalt mixture for the upper layer of the amphibole pavement consists of SBS modified asphalt and mineral aggregate, wherein the oilstone ratio of the modified asphalt mixture is 4.8 percent, and the SBS modified asphalt comprises the following raw materials in parts by weight: 96 parts of matrix asphalt, 8 parts of SBS modifier and nano TiO22 parts of organic montmorillonite, 2 parts of modified fiber and 1 part of modified fiber;
the mineral aggregate comprises the following raw materials in parts by weight: 60 parts of coarse aggregate, 30 parts of fine aggregate, 0.5 part of mineral powder and 1 part of cement;
the preparation method of the modified asphalt mixture for the upper layer of the amphibole pavement comprises the following steps:
s1: selecting large-block flash rock rubble with good forming and little weathered soft stone, crushing, screening and drying to obtain coarse aggregates with different particle sizes, adding the coarse aggregates, the fine aggregates, the mineral powder and the cement into a mixing plant according to a ratio, heating to 175 ℃, and uniformly stirring and mixing to obtain hot mineral aggregate;
s2: heating asphalt substrate to 165 deg.C to make the substrate asphalt be in molten state, adding SBS modifier and nano TiO2Mixing, shearing and grinding the organic montmorillonite, inoculating the mixture for 1.5h at 170 ℃, adding the modified fiber, stirring and mixing uniformly to obtain SBS modified asphalt;
s3: and adding the SBS modified asphalt into the hot mineral aggregate, and uniformly stirring and mixing to obtain a modified asphalt mixture.
Performance detection
(1) Marshall test
Molding by using a method of compacting 75 times on both surfaces respectively, wherein the compacting molding temperature is controlled at 160 ℃ and 165 ℃. The method for testing the gross volume relative density is a dry method, the maximum theoretical relative density of the asphalt mixture is calculated, and the Marshall test results are shown in the following table 2:
TABLE 2 modified asphalt mixture Marshall test results
From the above table 2, it can be seen that the modified asphalt mixtures in examples 1 to 4 of the present invention meet the technical requirements in the marshall test.
(2) Water stability detection
The modified asphalt mixtures in examples 1 to 4 of the present invention were subjected to a residual stability test and a freeze-thaw splitting test, and the test results are shown in table 3 below:
TABLE 3 modified asphalt mixture Water stability test results
It can be seen from table 3 that the residual stability and the freeze-thaw cleavage tensile strength ratio of the modified asphalt mixtures in examples 1 to 4 of the present invention both meet the technical requirements.
(3) High temperature stability detection
The modified asphalt mixture in examples 1 to 4 of the present invention was subjected to rutting test, the test piece size was 300mmX50mm, and the test conditions were as follows: 60 +/-0.5 ℃, 0.7 +/-0.05 MPa, and the test results are shown in the following table 4:
TABLE 4 Rut test results of modified asphalt mixture at 60 ℃
As can be seen from Table 4, the dynamic stability of the modified asphalt mixtures in examples 1 to 4 of the present invention meets the technical requirements.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (10)
1. The asphalt mixture for the upper layer of the amphibole pavement is characterized in that the modified asphalt mixture consists of SBS modified asphalt and mineral aggregate, and the modified asphalt mixture isThe material-oil-stone ratio is 4.7-4.8%, and the SBS modified asphalt comprises the following raw materials in parts by weight: 90-100 parts of matrix asphalt, 8-10 parts of SBS modifier and nano TiO22-3 parts of organic montmorillonite, 1-2 parts of organic montmorillonite and 0.5-1 part of modified fiber;
the mineral aggregate comprises the following raw materials in parts by weight: 60-70 parts of coarse aggregate, 30-35 parts of fine aggregate, 0-2 parts of mineral powder and 1-3 parts of cement, wherein the coarse aggregate is the amphibole macadam.
2. The asphalt mixture according to claim 1, wherein the modified fibers are wood fibers surface-modified with an organosilane, and the wood fibers have a diameter of 0.5-2 mm and a length of 50-100 mm.
3. The amphibole pavement upper-layer modified asphalt mixture according to claim 1, wherein the coarse aggregates are classified into 1# coarse aggregates, 2# coarse aggregates and 3# coarse aggregates according to particle size, the particle size of the 1# coarse aggregates is 9.5-16mm, the particle size of the 2# coarse aggregates is 4.75-9.5mm, and the particle size of the 3# coarse aggregates is 2.36-4.75 mm.
4. The amphibole pavement upper layer modified asphalt mixture according to claim 1, wherein the fine aggregate is limestone machine sand, and the particle size of the fine aggregate is 0-2.36 mm.
5. The amphibole pavement upper layer modified asphalt mixture according to claim 1, wherein the cement is ordinary portland cement.
6. The amphibole pavement upper layer modified asphalt mixture according to claim 1, wherein the mineral powder is limestone mineral powder, and the particle size of the mineral powder is 0.075-0.15 mm.
7. The amphibole pavement upper layer modified asphalt mixture according to claim 1, wherein the mineral aggregate is graded as follows: 100 percent of 16mm sieve pores, 94-100 percent of 13.2mm sieve pores, 68-78 percent of 9.5mm sieve pores, 32-45 percent of 4.75mm sieve pores, 22-35 percent of 2.36mm sieve pores, 8-12 percent of 1.18mm sieve pores, 10-19 percent of 0.6mm sieve pores, 7-14 percent of 0.3mm sieve pores, 5-10 percent of 0.15mm sieve pores and 4-8 percent of 0.075mm sieve pores.
8. The preparation method of the amphibole pavement upper layer modified asphalt mixture as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
s1: selecting large-block flash rock rubble with good forming and little weathered soft stone, crushing, screening and drying to obtain coarse aggregates with different particle sizes, adding the coarse aggregates, the fine aggregates, the mineral powder and the cement into a mixing plant according to a ratio, heating to 175-fold sand-adding temperature and 180 ℃, and uniformly stirring and mixing to obtain hot mineral aggregate;
s2: heating the asphalt substrate to 160-180 ℃ to ensure that the substrate asphalt is in a molten state, adding SBS modifier and nano TiO2Mixing, shearing and grinding the organic montmorillonite, inoculating at 180 ℃ for 1-1.5h at 170 ℃ and adding the modified fiber, and stirring and mixing uniformly to obtain SBS modified asphalt;
s3: and adding the SBS modified asphalt into the hot mineral aggregate, and uniformly stirring and mixing to obtain a modified asphalt mixture.
9. The method for preparing the modified asphalt mixture for the upper layer of the amphibole pavement according to claim 8, wherein a multistage crushing process of impact breaking, conical breaking, impact breaking and shaping machine is adopted in the step S1, and the inclination angle of a sieve plate of a vibrating screen for aggregate processing is controlled to be 23-25 degrees.
10. The method for preparing the modified asphalt mixture for the upper layer of the amphibole pavement according to claim 8, wherein the shearing is performed by a high shear emulsifying machine in the step S2, the rotating speed is 3000-4000r/min, and the shearing time is 1-2 h.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114538821A (en) * | 2022-01-11 | 2022-05-27 | 山东大学 | Composite modified red mud-based asphalt anti-aging agent, preparation method and application |
| CN115159896A (en) * | 2022-05-30 | 2022-10-11 | 中铁四局集团第一工程有限公司 | Dry SBS (styrene butadiene styrene) modified asphalt mixture and preparation method thereof |
| CN115417623A (en) * | 2022-08-17 | 2022-12-02 | 中交一公局集团有限公司 | Synthetic method and application of novel long-life modified asphalt for pavement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114538821A (en) * | 2022-01-11 | 2022-05-27 | 山东大学 | Composite modified red mud-based asphalt anti-aging agent, preparation method and application |
| CN115159896A (en) * | 2022-05-30 | 2022-10-11 | 中铁四局集团第一工程有限公司 | Dry SBS (styrene butadiene styrene) modified asphalt mixture and preparation method thereof |
| CN115417623A (en) * | 2022-08-17 | 2022-12-02 | 中交一公局集团有限公司 | Synthetic method and application of novel long-life modified asphalt for pavement |
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