CN110054438B - High-performance modified asphalt, preparation method thereof and asphalt concrete - Google Patents
High-performance modified asphalt, preparation method thereof and asphalt concrete Download PDFInfo
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- CN110054438B CN110054438B CN201910293569.4A CN201910293569A CN110054438B CN 110054438 B CN110054438 B CN 110054438B CN 201910293569 A CN201910293569 A CN 201910293569A CN 110054438 B CN110054438 B CN 110054438B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 120
- 239000011384 asphalt concrete Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims description 19
- 239000011159 matrix material Substances 0.000 claims abstract description 41
- 229910017059 organic montmorillonite Inorganic materials 0.000 claims abstract description 34
- 239000000843 powder Substances 0.000 claims abstract description 33
- 239000002994 raw material Substances 0.000 claims abstract description 29
- 239000010920 waste tyre Substances 0.000 claims abstract description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229960000892 attapulgite Drugs 0.000 claims abstract description 23
- 229910052625 palygorskite Inorganic materials 0.000 claims abstract description 23
- 239000004927 clay Substances 0.000 claims abstract description 22
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 8
- 239000011707 mineral Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 91
- 239000013067 intermediate product Substances 0.000 claims description 28
- 239000000725 suspension Substances 0.000 claims description 28
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 238000010008 shearing Methods 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 10
- SWLVFNYSXGMGBS-UHFFFAOYSA-N ammonium bromide Chemical compound [NH4+].[Br-] SWLVFNYSXGMGBS-UHFFFAOYSA-N 0.000 claims description 7
- 238000012258 culturing Methods 0.000 claims description 7
- 239000012153 distilled water Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000005485 electric heating Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 235000019738 Limestone Nutrition 0.000 claims description 5
- 239000006028 limestone Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000003712 anti-aging effect Effects 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 8
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- 238000000227 grinding Methods 0.000 description 5
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- 238000000967 suction filtration Methods 0.000 description 5
- 229910052901 montmorillonite Inorganic materials 0.000 description 3
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- 241000934806 Krameria Species 0.000 description 1
- 241000446313 Lamella Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 239000011294 coal tar pitch Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
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- 239000011306 natural pitch Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides high-performance modified asphalt which comprises the following raw materials in parts by mass: 100 parts of matrix asphalt, 1-4 parts of waste tire powder, 2-6 parts of organic montmorillonite, 1-6 parts of diatomite and 2-5 parts of attapulgite clay; the invention also provides asphalt concrete which comprises the following raw materials, by mass, 4-5 parts of high-performance modified asphalt, 95-97 parts of aggregate and 3-5 parts of mineral powder. The high-performance modified asphalt and the asphalt concrete provided by the invention are simple to prepare, good in high-temperature stability, strong in anti-rutting capability and anti-aging performance, good in durability, low in later maintenance cost, and especially suitable for being popularized and used in areas with strong ultraviolet rays and more heavy traffic.
Description
Technical Field
The invention belongs to the technical field of road engineering, and particularly relates to high-performance modified asphalt, a preparation method thereof and asphalt concrete.
Background
The asphalt is a black-brown complex mixture composed of hydrocarbons with different molecular weights and nonmetal derivatives thereof, is one of high-viscosity organic liquids, is in a liquid state, and has a black surface. The asphalt can be classified into coal tar asphalt, petroleum asphalt and natural asphalt. Among them, coal tar pitch is a by-product of coking, petroleum pitch is a residue after crude oil distillation, and natural pitch is stored underground, and some forms a mineral layer or is accumulated on the surface of the earth crust. The asphalt is mainly used in the industries of paint, plastics, rubber and the like and pavement and the like.
Asphalt is widely used in the paving industry, however, common matrix asphalt pavements are susceptible to rutting, bulging, loosening and other diseases due to vehicle loads and environmental factors, and fatigue and aging of asphalt are the main causes of insufficient durability of asphalt pavements. In the process of construction and long-term use of asphalt pavement, light components in the asphalt are easy to volatilize, so that the asphalt pavement is hardened and embrittled, and therefore, the temperature sensitivity and the rheological property of the asphalt must be improved. Many polymer modified asphalts have been used for asphalt pavement, however, the polymer modified asphalts are expensive and have many environmental problems in practical applications.
Disclosure of Invention
In view of the above-mentioned disadvantages in the prior art, one of the objectives of the present invention is to provide a high-performance modified asphalt and a preparation method thereof, wherein the high-performance modified asphalt has high-temperature stability, strong anti-rutting capability and anti-aging performance, and good durability; the other purpose of the invention is to provide the asphalt concrete.
In order to achieve the purpose, the invention provides the following technical scheme: a high-performance modified asphalt comprises the following raw materials in parts by mass: 100 parts of matrix asphalt, 1-4 parts of waste tire powder, 2-6 parts of organic montmorillonite, 1-6 parts of diatomite and 2-5 parts of attapulgite clay.
In the invention, the waste tire powder can generate swelling reaction in the matrix asphalt to absorb a part of light components, so that the viscosity of the asphalt is increased, and the stiffness modulus of the asphalt is improved, thereby further enhancing the track resistance and low-temperature cracking deformation resistance of the pavement; the addition of the montmorillonite can increase the internal friction, viscosity and elastic components of the asphalt, effectively improve the high-temperature performance of the mixture and greatly enhance the track deformation resistance of the pavement; in addition, the diatomite has the advantage of small heat conductivity coefficient, and the heat-insulating capability of the diatomite-doped mixture is improved, so that the low-temperature freeze-thaw resistance of the pavement is enhanced.
Further, the high-performance modified asphalt comprises the following raw materials in parts by mass: 100 parts of matrix asphalt, 2-3 parts of waste tire powder, 3-5 parts of organic montmorillonite, 3-5 parts of diatomite and 3-4 parts of attapulgite clay.
Further, the high-performance modified asphalt comprises the following raw materials in parts by mass: 100 parts of matrix asphalt, 2.5 parts of waste tire powder, 4 parts of organic montmorillonite, 3.5 parts of diatomite and 3.5 parts of attapulgite clay.
Further, the matrix asphalt is No. 70 matrix asphalt, and the matrix asphalt is placed in an oven at 130-150 ℃ for heat preservation for 2-3 hours before use.
Further, the preparation method of the organic montmorillonite comprises the following steps: adding 1-4 parts of ammonium bromide into 85-95 parts of distilled water, and stirring for 15-20 min to obtain a suspension; then adding 3-8 parts of sodium montmorillonite into the suspension, and adding a sodium hydroxide solution to adjust the pH value of the suspension to 10.0; and then stirring the suspension at 90 ℃ for 6-10 h, washing, filtering, and drying to obtain the organic montmorillonite.
The high-performance modified asphalt adopts the following preparation method:
(1) adding waste tire powder into matrix asphalt according to the raw material proportion, placing the mixture on a temperature-controllable electric heating furnace, stirring the mixture at the stirring temperature of 155-170 ℃, the stirring speed of 4000-5000 r/min for 25-40 min, and culturing the mixture for 0.5-2 h at constant temperature to obtain an intermediate product A;
(2) adding organic montmorillonite and diatomite into the intermediate product A according to the raw material ratio, manually stirring for 3-5 min at 130-150 ℃, and then stirring at a high speed of 140-150 ℃, 2000-3000 r/min for 30-45 min to obtain an intermediate product B;
(3) and adding the attapulgite clay into the intermediate product B, and stirring at a high speed by using a high-speed shearing instrument at the stirring temperature of 140-150 ℃, at the stirring speed of 4500-5500 r/min for 25-40 min to obtain the high-performance modified asphalt.
An asphalt concrete, comprising 4-5 parts by mass of the high-performance modified asphalt described in claims 1-5, 95-97 parts by mass of aggregate and 3-5 parts by mass of mineral powder.
Wherein the aggregate is limestone or basalt.
Compared with the prior art, the invention has the following beneficial effects:
1. the matrix asphalt is modified by utilizing the waste tire powder, the organic montmorillonite, the diatomite and the attapulgite clay, the addition of the montmorillonite, the diatomite and the waste tire powder enables the matrix asphalt to be in a lamellar distribution state on a microscopic layer, and the attapulgite clay added into the matrix asphalt is in a rod shape and a fiber shape and is inserted between asphalt lamella to form a stable net structure in the asphalt, and the mixed asphalt is a uniform dispersion system, so that the asphalt modification effect is better, and the rheological property of the modified asphalt is further improved; in addition, the attapulgite can absorb ultraviolet rays and has a positive effect on improving the anti-aging capacity of the asphalt concrete. Meanwhile, montmorillonite, diatomite and attapulgite clay are added after the waste tire powder is added and adsorbed on the surface of the waste tire powder particles, so that the full progress of the swelling reaction of the waste tire powder in the matrix asphalt can be ensured, the further contact between the waste tire powder and the asphalt is reduced, the serious desulfurization degradation of the asphalt is avoided, and the optimal service time of the high-performance asphalt is prolonged.
2. The high-performance modified asphalt and the asphalt concrete have the advantages of simple preparation, good high-temperature stability, strong anti-rutting capability and anti-aging performance, good durability and low later maintenance cost, and are particularly suitable for popularization and use in areas with strong ultraviolet rays and more heavy-load traffic.
Drawings
FIG. 1 is a schematic view of a pavement structure according to embodiments 6-8 of the present invention;
FIG. 2 is a schematic view of a pavement structure of comparative example 1;
fig. 3 is a schematic view of the pavement structure of comparative example 2.
Detailed Description
The process of the present invention will be described in detail with reference to specific examples. The present embodiment is implemented on the premise of the technology of the present invention, and a detailed implementation and a specific operation process are given, but the scope of the present invention is not limited to the following examples.
Preparation of high-performance modified asphalt
Example 1
A high-performance modified asphalt comprises the following raw materials in parts by mass: 100 parts of matrix asphalt, 1 part of waste tire powder, 2 parts of organic montmorillonite, 1 part of diatomite and 2 parts of attapulgite clay.
The preparation method of the organic montmorillonite comprises the following steps: adding 1 part of ammonium bromide into 85 parts of distilled water, and stirring for 15min to obtain a suspension; then adding 3 parts of sodium montmorillonite into the suspension, and adding a sodium hydroxide solution to adjust the pH value of the suspension to 10.0; and then stirring the suspension at 90 ℃ for 6h, carrying out suction filtration on the obtained solution, washing the suction-filtered solution by using deionized water, and drying and grinding the washed sample to obtain the organic montmorillonite.
The preparation method of the high-performance modified asphalt comprises the following steps:
(1) adding waste tire powder into matrix asphalt according to the raw material proportion, placing the mixture on a temperature-controllable electric heating furnace, stirring by using a high-speed shearing instrument at the stirring temperature of 155 ℃, the stirring speed of 4000r/min and the stirring time of 25min, and culturing for 0.5h at a constant temperature to obtain an intermediate product A;
(2) adding organic montmorillonite and diatomite into the intermediate product A according to the raw material ratio, manually stirring for 3min at 130 ℃, and then stirring at a high speed by using a high-speed shearing instrument at the stirring temperature of 140 ℃, the stirring speed of 2000r/min and the stirring time of 30min to obtain an intermediate product B;
(3) and adding the attapulgite clay into the intermediate product B, and stirring at a high speed by using a high-speed shearing instrument at the stirring temperature of 140 ℃, at the stirring speed of 4500r/min for 25min to obtain the high-performance modified asphalt.
Example 2
A high-performance modified asphalt comprises the following raw materials in parts by mass: 100 parts of matrix asphalt, 4 parts of waste tire powder, 6 parts of organic montmorillonite, 6 parts of diatomite and 5 parts of attapulgite clay.
The preparation method of the organic montmorillonite comprises the following steps: adding 4 parts of ammonium bromide into 95 parts of distilled water, and stirring for 20min to obtain a suspension; then adding 8 parts of sodium montmorillonite into the suspension, and adding a sodium hydroxide solution to adjust the pH value of the suspension to 10.0; and then stirring the suspension at 90 ℃ for 10h, carrying out suction filtration on the obtained solution, washing the suction-filtered solution by using deionized water, and drying and grinding the washed sample to obtain the organic montmorillonite.
The preparation method of the high-performance modified asphalt comprises the following steps:
(1) adding waste tire powder into matrix asphalt according to the raw material proportion, placing the mixture on a temperature-controllable electric heating furnace, stirring by using a high-speed shearing instrument at the stirring temperature of 170 ℃, the stirring speed of 5000r/min and the stirring time of 40min, and culturing for 2h at a constant temperature to obtain an intermediate product A;
(2) adding organic montmorillonite and diatomite into the intermediate product A according to the raw material ratio, manually stirring for 5min at 150 ℃, and then stirring at a high speed by using a high-speed shearing instrument at the stirring temperature of 150 ℃, the stirring speed of 3000r/min and the stirring time of 45min to obtain an intermediate product B;
(3) and adding the attapulgite clay into the intermediate product B, and stirring at a high speed by using a high-speed shearing instrument at the stirring temperature of 150 ℃ at the stirring speed of 5500r/min for 40min to obtain the high-performance modified asphalt.
Example 3
A high-performance modified asphalt comprises the following raw materials in parts by mass: 100 parts of matrix asphalt, 2 parts of waste tire powder, 3 parts of organic montmorillonite, 3 parts of diatomite and 3 parts of attapulgite clay.
The preparation method of the organic montmorillonite comprises the following steps: adding 2.5 parts of ammonium bromide into 90 parts of distilled water, and stirring for 20min to obtain a suspension; then 5.5 parts of sodium montmorillonite is added into the suspension, and sodium hydroxide solution is added to adjust the pH value of the suspension to 10.0; and then stirring the suspension at 90 ℃ for 10h, carrying out suction filtration on the obtained solution, washing the suction-filtered solution by using deionized water, and drying and grinding the washed sample to obtain the organic montmorillonite.
The preparation method of the high-performance modified asphalt comprises the following steps:
(1) adding waste tire powder into matrix asphalt according to the raw material proportion, placing the mixture on a temperature-controllable electric heating furnace, stirring by using a high-speed shearing instrument at the stirring temperature of 170 ℃, the stirring speed of 5000r/min and the stirring time of 40min, and culturing for 2h at a constant temperature to obtain an intermediate product A;
(2) adding organic montmorillonite and diatomite into the intermediate product A according to the raw material ratio, manually stirring for 5min at 150 ℃, and then stirring at a high speed by using a high-speed shearing instrument at the stirring temperature of 150 ℃, the stirring speed of 3000r/min and the stirring time of 45min to obtain an intermediate product B;
(3) and adding the attapulgite clay into the intermediate product B, and stirring at a high speed by using a high-speed shearing instrument at the stirring temperature of 145 ℃ at the stirring speed of 5500r/min for 40min to obtain the high-performance modified asphalt.
Example 4
A high-performance modified asphalt comprises the following raw materials in parts by mass: 100 parts of matrix asphalt, 3 parts of waste tire powder, 5 parts of organic montmorillonite, 5 parts of diatomite and 4 parts of attapulgite clay.
The preparation method of the organic montmorillonite comprises the following steps: adding 2 parts of ammonium bromide into 90 parts of distilled water, and stirring for 18min to obtain a suspension; then 6 parts of sodium montmorillonite is added into the suspension, and sodium hydroxide solution is added to adjust the pH value of the suspension to 10.0; and then stirring the suspension at 90 ℃ for 8h, carrying out suction filtration on the obtained solution, washing the suction-filtered solution by using deionized water, and drying and grinding the washed sample to obtain the organic montmorillonite.
The preparation method of the high-performance modified asphalt comprises the following steps:
(1) adding waste tire powder into matrix asphalt according to the raw material proportion, placing the mixture on a temperature-controllable electric heating furnace, stirring by using a high-speed shearing instrument at the stirring temperature of 160 ℃, the stirring speed of 4500r/min and the stirring time of 30min, and culturing for 1h at constant temperature to obtain an intermediate product A;
(2) adding organic montmorillonite and diatomite into the intermediate product A according to the raw material ratio, manually stirring for 4min at 140 ℃, and then stirring at high speed by using a high-speed shearing instrument at the stirring temperature of 145 ℃, the stirring speed of 2500r/min and the stirring time of 40min to obtain an intermediate product B;
(3) and adding the attapulgite clay into the intermediate product B, and stirring at a high speed by using a high-speed shearing instrument at the stirring temperature of 145 ℃, at the stirring speed of 5000r/min and for 30min to obtain the high-performance modified asphalt.
Example 5
A high-performance modified asphalt comprises the following raw materials in parts by mass: 100 parts of matrix asphalt, 2.5 parts of waste tire powder, 4 parts of organic montmorillonite, 3.5 parts of diatomite and 3.5 parts of attapulgite clay.
The preparation method of the organic montmorillonite comprises the following steps: adding 3 parts of ammonium bromide into 88 parts of distilled water, and stirring for 18min to obtain a suspension; then adding 5 parts of sodium montmorillonite into the suspension, and adding a sodium hydroxide solution to adjust the pH value of the suspension to 10.0; and then stirring the suspension at 90 ℃ for 9 hours, carrying out suction filtration on the obtained solution, washing the suction-filtered solution by using deionized water, and drying and grinding the washed sample to obtain the organic montmorillonite.
The preparation method of the high-performance modified asphalt comprises the following steps:
(1) adding waste tire powder into matrix asphalt according to the raw material proportion, placing the mixture on a temperature-controllable electric heating furnace, stirring by using a high-speed shearing instrument at the stirring temperature of 165 ℃, the stirring speed of 4800r/min and the stirring time of 35min, and culturing for 1.5h at a constant temperature to obtain an intermediate product A;
(2) adding the organic montmorillonite and the diatomite into the intermediate product A according to the raw material ratio, manually stirring for 4min at 145 ℃, and then stirring at high speed by using a high-speed shearing instrument, wherein the stirring temperature is 145 ℃, the stirring speed is 2000r/min, and the stirring time is 35min to obtain an intermediate product B;
(3) and adding the attapulgite clay into the intermediate product B, and stirring at a high speed by using a high-speed shearing instrument at the stirring temperature of 150 ℃, at the stirring speed of 5000r/min and for 30min to obtain the high-performance modified asphalt.
In examples 1-5 of the present invention, the matrix asphalt is 70# matrix asphalt, but other types of asphalt may be used, such as korean dragon 70# matrix asphalt, SK70# matrix asphalt, east sea 70# matrix asphalt, and krameria 90# matrix asphalt, and in examples 1-5, before preparing the high-performance modified asphalt, all the adopted matrix asphalt needs to be placed in an oven at 130-150 ℃ for heat preservation for 2-3 hours to ensure sufficient fluidity of the matrix asphalt.
Table 1 shows the comparison of the properties of the high-performance modified asphalt prepared by the method of the present invention with those of the comparative asphalt, and the results are shown in Table 1.
TABLE 1 comparison of the Properties of the high-Performance modified asphalt of the present invention and that of the comparative asphalt
As can be seen from Table 1, compared with the common matrix asphalt and the SBS modified asphalt, the high-performance modified asphalt has the minimum change range of the penetration index, the ductility index and the softening point index and the minimum performance reduction after the ultraviolet long-term aging process, which indicates that the anti-aging capability of the high-performance modified asphalt is superior to that of the matrix asphalt and the SBS modified asphalt.
Secondly, preparing asphalt concrete
Example 6
The asphalt concrete comprises the following raw materials in parts by weight: 4 parts of high-performance modified asphalt, 95 parts of aggregate limestone and 3 parts of mineral powder.
Example 7
The asphalt concrete comprises the following raw materials in parts by weight: 5 parts of high-performance modified asphalt, 97 parts of aggregate limestone and 5 parts of mineral powder.
Example 8
The asphalt concrete comprises the following raw materials in parts by weight: 4.5 parts of high-performance modified asphalt, 96 parts of aggregate limestone and 4 parts of mineral powder.
The asphalt concretes of the above examples 6 to 8 were prepared by the following methods: the high-performance modified asphalt, the aggregate and the mineral powder of the components are uniformly stirred at the temperature of 160-170 ℃ to form the asphalt concrete.
Paving the asphalt concrete prepared by the invention, matrix asphalt concrete (comparative example 1) and SBS modified asphalt concrete (comparative example 2) in a comparative way, wherein the upper layer, the middle layer and the lower layer in the figure 1 are the asphalt concrete prepared by the invention; the upper, middle and lower layers of FIG. 2 are all matrix asphalt concrete; the upper, middle and lower layers in fig. 3 are all SBS modified asphalt concrete, and the comparison result of the pavement performance is shown in Table 2.
TABLE 2 comparison of road-use Properties of examples and comparative examples
As can be seen from Table 2, compared with the matrix asphalt concrete, the high-performance modified asphalt concrete has different improvements in high-temperature stability, low-temperature freeze-thaw resistance, rutting resistance and fatigue resistance, and the durability is enhanced, and the high-temperature stability and the rutting resistance are also superior to that of SBS modified asphalt concrete, and can be applied to various asphalt layers.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. The high-performance modified asphalt is characterized by comprising the following raw materials in parts by mass: 100 parts of matrix asphalt, 2-3 parts of waste tire powder, 3-5 parts of organic montmorillonite, 3-5 parts of diatomite and 3-4 parts of attapulgite clay,
when the high-performance modified asphalt is prepared, waste tire powder is added into matrix asphalt, then organic montmorillonite and diatomite are added, and finally attapulgite clay is added.
2. The high-performance modified asphalt of claim 1, which is characterized by comprising the following raw materials in parts by mass: 100 parts of matrix asphalt, 2.5 parts of waste tire powder, 4 parts of organic montmorillonite, 3.5 parts of diatomite and 3.5 parts of attapulgite clay.
3. The high-performance modified asphalt according to claim 1, wherein the base asphalt is No. 70 base asphalt, and the base asphalt is placed in an oven at 130-150 ℃ for heat preservation for 2-3 hours before use.
4. The high-performance modified asphalt of claim 1, wherein the preparation method of the organic montmorillonite comprises the following steps: adding 1-4 parts of ammonium bromide into 85-95 parts of distilled water, and stirring for 15-20 min to obtain a suspension; then adding 3-8 parts of sodium montmorillonite into the suspension, and adding a sodium hydroxide solution to adjust the pH value of the suspension to 10.0; and then stirring the suspension at 90 ℃ for 6-10 h, washing, filtering, and drying to obtain the organic montmorillonite.
5. A process for preparing a high-performance modified asphalt according to any one of claims 1 to 4, comprising the steps of:
(1) adding waste tire powder into matrix asphalt according to the raw material proportion, placing the mixture on a temperature-controllable electric heating furnace, stirring the mixture at the stirring temperature of 155-170 ℃, the stirring speed of 4000-5000 r/min, the stirring time of 25-40 min, and culturing the mixture for 0.5-2 h at constant temperature to obtain an intermediate product A;
(2) adding organic montmorillonite and diatomite into the intermediate product A according to the raw material ratio, manually stirring for 3-5 min at 130-150 ℃, and then stirring at a high speed of 140-150 ℃, 2000-3000 r/min for 30-45 min to obtain an intermediate product B;
(3) and adding the attapulgite clay into the intermediate product B, and stirring at a high speed by using a high-speed shearing instrument at the stirring temperature of 140-150 ℃, at the stirring speed of 4500-5500 r/min for 25-40 min to obtain the high-performance modified asphalt.
6. An asphalt concrete, characterized by comprising, by mass, 4 to 5 parts of the high-performance modified asphalt described in any one of claims 1 to 4, 95 to 97 parts of an aggregate, and 3 to 5 parts of mineral powder.
7. An asphalt concrete according to claim 6, wherein the aggregate is limestone or basalt.
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