CN115286290A - Wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks and preparation method thereof - Google Patents
Wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks and preparation method thereof Download PDFInfo
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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
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00258—Electromagnetic wave absorbing or shielding 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
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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 wave-absorbing asphalt mixture capable of quickly repairing cracks of an asphalt pavement, which comprises raw materials of modified asphalt, coarse aggregate, fine aggregate, lignocellulose and filler in parts by weight, wherein the filler is a mixture of a wave-absorbing material and mineral powder, and the wave-absorbing material is at least one of carbon black powder, carbonyl iron powder and nickel-zinc ferrite powder; the microwave absorbing material is added to improve the sensitivity of the asphalt mixture to microwaves, enhance the microwave absorbing capacity of the asphalt pavement, greatly improve the working efficiency of repairing cracks of the asphalt pavement by microwave heating, and effectively solve the problem existing in the field of applying the microwave heating technology to road maintenance. The wave-absorbing material has good compatibility with the asphalt mixture, replaces part of mineral powder with different volume fractions, is added into the asphalt mixture to form the wave-absorbing asphalt mixture, and has synergistic effect with the coarse aggregate of the asphalt mixture with good dielectric constant, so that the electromagnetic parameters and the electrical heating performance of the asphalt mixture are improved, the microwave absorption rate of the asphalt mixture is improved, and the good pavement performance of the asphalt mixture is ensured.
Description
Technical Field
The invention relates to an asphalt pavement repairing material, in particular to a wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks and a preparation method thereof.
Background
Cracking is one of the major problems of asphalt concrete pavements. If effective measures are not taken timely, cracks of the asphalt mixture can be further expanded under the action of surface water and circulating traffic loads, damage phenomena such as mud pumping, slurry turning, settlement and the like are easy to occur, and the service life of the asphalt pavement of the highway is finally shortened. At present, the asphalt pavement crack repairing technology at home and abroad mainly comprises a microwave heating technology, an induction heating technology, a self-healing microcapsule development technology, a light repairing technology and the like. The microwave heating technology is widely applied to the maintenance of the micro cracks of the asphalt pavement. The principle of the microwave heating technology is that the crack of the asphalt pavement is heated in an electromagnetic radiation mode, so that asphalt materials flow, and self-repairing of the crack of the pavement is promoted. However, since the asphalt material does not have the ability of absorbing microwaves, the common asphalt mixture can only absorb microwaves by virtue of the aggregate, so that the asphalt concrete is heated unevenly, the heating speed is slow, the heating efficiency is low, and the temperature required by asphalt healing is difficult to reach, so that the self-healing performance of the asphalt concrete can be hindered to a certain extent, and the application of the microwave heating technology in maintaining and repairing the asphalt pavement is limited.
Disclosure of Invention
In view of the above, the invention aims to provide a wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks and a preparation method thereof, and solves the problems of low sensitivity of common asphalt concrete to microwaves and low thermal conductivity of the asphalt mixture.
The wave-absorbing asphalt mixture capable of quickly repairing the cracks on the asphalt pavement comprises the following raw materials in parts by weight: 5-6 parts of modified asphalt, 60-80 parts of coarse aggregate, 15-25 parts of fine aggregate, 0.3-0.5 part of lignocellulose and 5-15 parts of filler, wherein the filler is a mixture of a wave-absorbing material and mineral powder, and the wave-absorbing material is at least one of carbon black powder, carbonyl iron powder and nickel zinc ferrite powder;
further, the modified asphalt is SBS modified asphalt, and the oilstone ratio is 5.5%;
further, the coarse aggregate is basalt coarse aggregate, and the fine aggregate is limestone fine aggregate;
further, the mineral powder in the filler is limestone mineral powder.
The invention also discloses a preparation method of the wave-absorbing asphalt mixture capable of quickly repairing the cracks of the asphalt pavement, which comprises the following steps:
a. heating the modified asphalt to a molten state for later use; mixing the coarse aggregate and the fine aggregate, preheating the mixture in an oven at 180-200 ℃ for 3-4 hours for later use; respectively mixing wave-absorbing materials with different mixing amounts with the mineral powder, and preheating to 170-180 ℃ for later use;
b. mixing and stirring lignin fibers, heated coarse aggregates and heated fine aggregates, then adding wave-absorbing materials with different mixing amounts and mineral powder, mixing and re-stirring, and finally adding heated modified asphalt and stirring to prepare a wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks;
further, in the step a, the mixing amount of the wave-absorbing material is 10%, 20% and 30% of the volume fraction of the mineral powder;
further, in the step b, the stirring time is 80-100s.
The invention has the beneficial effects that: according to the wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks and the preparation method thereof disclosed by the invention, the sensitivity of the asphalt mixture to microwaves is improved through the doped wave-absorbing material, the microwave absorption capacity of the asphalt pavement is enhanced, the working efficiency of repairing the asphalt pavement cracks through microwave heating is greatly improved, and the problems existing in the field of applying the microwave heating technology to road maintenance are effectively solved. The adopted wave-absorbing material has good compatibility with the asphalt mixture, replaces part of mineral powder with different volume fractions to be added into the asphalt mixture to form the wave-absorbing asphalt mixture, and has synergistic effect with the asphalt mixture coarse aggregate with good dielectric constant, so that the electromagnetic parameters and the electroacoustics performance of the asphalt mixture are improved, the microwave absorption rate of the asphalt mixture is improved, and the good road performance of the asphalt mixture is ensured. And as the wave-absorbing material and the asphalt are wrapped by the aggregate, and the wave-absorbing material has a better dielectric constant than the aggregate, more microwave energy is converted into heat energy along with the increase of the content of the wave-absorbing material, thereby improving the heating efficiency of the asphalt mixture. Therefore, the temperature rise of the asphalt mixture is the temperature rise of the aggregate on one hand, and the wave-absorbing material promotes the temperature rise on the other hand.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a microscopic view of carbon black powder, carbonyl iron powder, and nickel zinc ferrite powder;
FIG. 2 is a graph showing the relationship between the average surface temperature changes of the asphalt mixture under different amounts of carbon black powder, carbonyl iron powder and nickel-zinc ferrite powder;
FIG. 3 is a comparison graph of rutting test results of different types of absorbing asphalt mixtures;
FIG. 4 is a comparison graph of test results of low-temperature crack resistance of different types of wave-absorbing asphalt mixtures;
FIG. 5 is a comparison graph of freeze-thaw split strength ratio (TSR) of different types of wave-absorbing asphalt mixtures;
FIG. 6 is a graph showing the relationship between the healing rate of different wave-absorbing asphalt mixtures and the change of the dosage of wave-absorbing materials.
Detailed Description
Example one
The wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks comprises the following raw materials in parts by weight: 5.5 parts of modified asphalt, 70 parts of coarse aggregate, 20 parts of fine aggregate, 0.3 part of lignocellulose and 10 parts of filler, wherein the filler is a mixture of a wave-absorbing material and mineral powder, and the wave-absorbing material is carbon black powder. The preparation method comprises the following steps:
a. firstly, heating SBS (asphalt-to-stone ratio is 5.5%) modified asphalt in a 165 ℃ oven for 3 hours to a molten state, mixing the graded coarse aggregate and fine aggregate, preheating in a 190 ℃ oven for 3 hours, mixing the carbon black powder with the mixing amount of 10%, 20% and 30% (volume fraction of mineral powder) and the mineral powder, and preheating to 175 ℃;
b. mixing the lignin fiber with the heated coarse aggregate and fine aggregate, stirring for 90s, adding carbon black powder and mineral powder with different mixing amounts, mixing, re-stirring for 90s, and finally adding the heated SBS modified asphalt, and stirring for 90s, thereby obtaining the carbon black powder-containing wave-absorbing asphalt mixture for repairing the cracks of the asphalt pavement.
Comparative example 1
The comparative example is a common asphalt mixture without adding a wave absorbing material, and is prepared from 70 mass percent of basalt coarse aggregate, 19.8 mass percent of limestone fine aggregate and 10.2 mass percent of limestone mineral powder, wherein the gradation type of the asphalt pavement mixture of the comparative example is SMA-13, the modified asphalt is SBS modified asphalt, and the oil-stone ratio is 5.5%.
Example two
The wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks comprises the following raw materials in parts by weight: 6 parts of modified asphalt, 68 parts of coarse aggregate, 20 parts of fine aggregate, 0.3 part of lignocellulose and 10 parts of filler, wherein the filler is a mixture of a wave-absorbing material and mineral powder, and the wave-absorbing material is carbonyl iron powder. The preparation method comprises the following steps:
a. firstly, SBS modified asphalt (the oil stone ratio is 5.5%) is heated in an oven at 165 ℃ for 4 hours to be in a molten state, coarse aggregates and fine aggregates which are weighed according to the grading are mixed and preheated in the oven at 190 ℃ for 4 hours, carbonyl iron powder and mineral powder with the mixing amount of 10%, 20% and 30% (volume fraction of the mineral powder) are mixed and preheated to 175 ℃;
b. mixing the lignin fiber with the heated coarse aggregate and fine aggregate, stirring for 90s, adding carbonyl iron powder and mineral powder with different mixing amounts, mixing, re-stirring for 90s, and finally adding the heated SBS modified asphalt, and stirring for 90s, thereby obtaining the carbonyl iron powder-containing wave-absorbing asphalt mixture for repairing the cracks of the asphalt pavement.
EXAMPLE III
The wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks comprises the following raw materials in parts by weight: 5.3 parts of modified asphalt, 72 parts of coarse aggregate, 20 parts of fine aggregate, 0.4 part of lignocellulose and 10 parts of filler, wherein the filler is a mixture of a wave-absorbing material and mineral powder, and the wave-absorbing material is nickel-zinc ferrite powder. The preparation method comprises the following steps:
a. firstly, SBS modified asphalt (the oilstone ratio is 5.5%) is heated in an oven at 165 ℃ for 3.5 hours to be in a molten state, coarse aggregate and fine aggregate which are weighed according to the grading are mixed and preheated in the oven at 190 ℃ for 3.5 hours, and nickel-zinc ferrite powder and mineral powder which are doped with 10%, 20% and 30% (volume fraction of the mineral powder) are mixed and preheated to 175 ℃;
b. mixing lignin fibers with heated coarse aggregates and fine aggregates, stirring for 90s, adding nickel-zinc ferrite powder with different mixing amounts and mineral powder, mixing for 90s, adding heated SBS modified asphalt, and stirring for 90s to obtain the nickel-zinc-containing ferrite powder wave-absorbing asphalt mixture for repairing asphalt pavement cracks.
Example four
The wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks comprises the following raw materials in parts by weight: 5.6 parts of modified asphalt, 60 parts of coarse aggregate, 15 parts of fine aggregate, 0.5 part of lignocellulose and 5 parts of filler, wherein the filler is a mixture of a wave-absorbing material and mineral powder, and the wave-absorbing material is carbon black powder and carbonyl iron powder. The preparation method comprises the following steps:
a. firstly, SBS modified asphalt (the oil stone ratio is 5.5%) is heated in an oven at 165 ℃ for 4 hours to be in a molten state, coarse aggregate and fine aggregate which are weighed according to the gradation are mixed and preheated in the oven at 180 ℃ for 4 hours, carbonyl iron powder, carbon black powder and mineral powder with the doping amount of 10%, 20% and 30% (volume fraction of the mineral powder) are mixed and preheated to 170 ℃;
b. mixing the lignin fiber with the heated coarse aggregate and fine aggregate, stirring for 80s, adding carbonyl iron powder and mineral powder with different mixing amounts, mixing, re-stirring for 80s, and finally adding the heated SBS modified asphalt, stirring for 80s, thereby obtaining the carbonyl iron powder-containing wave-absorbing asphalt mixture for repairing the cracks of the asphalt pavement.
EXAMPLE five
The wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks comprises the following raw materials in parts by weight: 5 parts of modified asphalt, 70 parts of coarse aggregate, 20 parts of fine aggregate, 0.4 part of lignocellulose and 10 parts of filler, wherein the filler is a mixture of a wave-absorbing material and mineral powder, and the wave-absorbing material is carbonyl iron powder and nickel zinc ferrite powder. The preparation method comprises the following steps:
a. firstly, SBS modified asphalt (the oilstone ratio is 5.5 percent) is heated in an oven at 165 ℃ for 4 hours to be in a molten state, coarse aggregate and fine aggregate which are weighed according to the gradation are mixed and preheated in the oven at 200 ℃ for 3.5 hours, and carbonyl iron powder, nickel zinc ferrite powder and mineral powder with the doping amount of 10 percent, 20 percent and 30 percent (volume fraction of the mineral powder) are respectively mixed and preheated to 180 ℃;
b. mixing the lignin fiber with the heated coarse aggregate and fine aggregate, stirring for 100s, adding carbonyl iron powder and mineral powder with different mixing amounts, mixing, re-stirring for 100s, and finally adding the heated SBS modified asphalt, stirring for 100s, thereby obtaining the carbonyl iron powder-containing wave-absorbing asphalt mixture for repairing the cracks of the asphalt pavement.
EXAMPLE six
The wave-absorbing asphalt mixture capable of quickly repairing the asphalt pavement cracks comprises the following raw materials in parts by weight: 6 parts of modified asphalt, 80 parts of coarse aggregate, 15 parts of fine aggregate, 0.35 part of lignocellulose and 10 parts of filler, wherein the filler is a mixture of a wave-absorbing material and mineral powder, and the wave-absorbing material is nickel-zinc ferrite powder. The preparation method comprises the following steps:
a. firstly, SBS modified asphalt (the oilstone ratio is 5.5%) is heated in an oven at 165 ℃ for 4 hours to be in a molten state, coarse aggregates and fine aggregates which are weighed according to the grading are mixed and preheated in the oven at 195 ℃ for 4 hours, and nickel-zinc ferrite powder and mineral powder with the mixing amount of 10%, 20% and 30% (volume fraction of the mineral powder) are mixed and preheated to 178 ℃ respectively;
b. mixing the lignin fibers with the heated coarse aggregate and fine aggregate, stirring for 95 seconds, adding carbonyl iron powder and mineral powder with different mixing amounts, mixing, re-stirring for 95 seconds, and finally adding the heated SBS modified asphalt, and stirring for 95 seconds to obtain the carbonyl iron powder-containing wave-absorbing asphalt mixture for repairing the cracks of the asphalt pavement.
Examples l to 3 and comparative example 1
1 microwave heating test
In order to explore the microwave heating temperature rise difference of the different types of wave-absorbing asphalt mixtures in the examples l to 3 and the comparative example 1, a rotary compaction test piece is formed according to the test specification of road engineering asphalt and asphalt mixture (JTG E20-2011) and is cut into a semicircular test piece. Placing the mixture in a household microwave oven for heating, and adjusting the microwave power to 700W and the microwave frequency to 2.45GHz. The microwave heating time is 2min, the heating is carried out once every 20 seconds, and the UTi160H type thermal infrared imager is used for recording the surface temperature distribution of the microwave absorbing asphalt mixture, so that the change rule of the surface temperature of the wave absorbing asphalt mixture along with the heating time is obtained. The test results are shown in FIG. 2.
2 road Performance verification experiment
In order to explore the difference of the road performance of the different types of wave-absorbing asphalt mixtures in the examples l to 3 and the comparative example 1, a high-temperature stability test, a low-temperature crack resistance test and a water stability test are carried out according to the test specification of road engineering asphalt and asphalt mixtures (JTG E20-2011)
(1) High temperature stability
And evaluating the high-temperature stability of the wave-absorbing asphalt mixture by adopting a rutting test. The test conditions are as follows: the size of a test piece is 300mm multiplied by 50mm, the test temperature is 60 ℃, the test time is 60min, the wheel pressure is 0.7MPa, and the loading rate is 42 times/min. The dynamic stability calculation formula is as follows (1):
in the formula, DS is the dynamic stability of the asphalt mixture, and is times/mm; d is a radical of 1 ，d 2 Are respectively corresponding time t 1 ,t 2 Deformation of (3), mm; n is the walking frequency of the test wheel, 42 times/min; c 1 ，C 2 And correcting the coefficient for the testing machine, and testing the coefficient.
The rutting test results of different types of wave-absorbing asphalt mixtures are shown in figure 3.
(2) Low temperature crack resistance
The low-temperature trabecula bending test is carried out by adopting a full-automatic asphalt mixture universal testing machine, and the low-temperature bending strain epsilon is measured B And the low-temperature crack resistance of the wave-absorbing asphalt mixture is used as an evaluation index. The small beam with the size of 250mm x 30mm x 35mm is first kept standing in a high and low temperature box at-10 ℃ for 45min, and then the center of the beam is pressed with a universal tester at a loading speed of 50 mm/min. Low temperature bending strain epsilon B The calculation formula is as shown in formula (2):
in the formula, h is the height of the cross-middle section test piece and is mm; l is the span of the test piece, mm; d is the mid-span deflection of the test piece when the test piece is damaged, and mm is used.
The test results of the low-temperature crack resistance of the different types of wave-absorbing asphalt mixtures are shown in figure 4.
(3) Stability to water
Water stability refers to the ability of an asphalt pavement to resist water damage when it is subjected to moisture attack. The freeze-thaw splitting test is carried out according to the road engineering asphalt and asphalt mixture test protocol (JTG E20-2011). Evaluating the water stability of the wave-absorbing asphalt mixture by using a freeze-thaw cleavage strength ratio (TSR), wherein the calculation formula is as shown in formula (3):
in the formula, R T1 Normal split freezing and thawing; r T2 Splitting freeze thawing is carried out under the condition of vacuum water saturation.
The freeze-thaw splitting strength ratio (TSR) of the wave-absorbing asphalt mixtures of different types is shown in figure 5.
3 semi-circular bend (SCB) test
The crack propagation performance tester for the asphalt mixture produced by Shanghai Changji company is adopted to carry out SCB test to evaluate the fracture performance of the wave-absorbing asphalt mixtures of different types, the test speed is 50mm/min, and the test temperature is normal temperature. The test apparatus is shown in fig. 3. In order to more accurately evaluate the healing capacity of the asphalt mixture, the peak load ratio measured by 2 loading tests before and after the healing of the same semicircular test piece is taken as the healing rate to carry out quantitative analysis, and the calculation formulas are respectively as shown in formula (4):
in the formula, HI is the peak load ratio,%; f 1 The peak load before healing of the test piece, kN; f 2 The peak load after healing of the test piece, kN. The relationship of the healing index of different wave-absorbing asphalt mixtures along with the change of the dosage of the wave-absorbing material is shown in figure 6.
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 (8)
1. The wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks is characterized in that: the wave-absorbing asphalt mixture comprises the following raw materials in parts by weight: 5-6 parts of modified asphalt, 60-80 parts of coarse aggregate, 15-25 parts of fine aggregate, 0.3-0.5 part of lignocellulose and 5-15 parts of filler, wherein the filler is a mixture of a wave-absorbing material and mineral powder, and the wave-absorbing material is at least one of carbon black powder, carbonyl iron powder and nickel zinc ferrite powder.
2. The wave-absorbing asphalt mixture capable of rapidly repairing asphalt pavement cracks according to claim 1, which is characterized in that: the modified asphalt is SBS modified asphalt with oil-stone ratio of 5.5%.
3. The wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks according to claim 2 is characterized in that: the coarse aggregate is basalt coarse aggregate, and the fine aggregate is limestone fine aggregate.
4. The wave-absorbing asphalt mixture capable of quickly repairing the cracks of the asphalt pavement according to claim 3 is characterized in that: the mineral powder in the filler is limestone mineral powder.
5. The wave-absorbing asphalt mixture capable of rapidly repairing asphalt pavement cracks according to claim 4, which is characterized in that: the particle size of the basalt aggregate is not less than 4.75mm, and the particle size of the limestone aggregate is not more than 4.75mm.
6. The preparation method of the wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks according to claim 1 is characterized by comprising the following steps of: the method comprises the following steps:
a. heating the modified asphalt to a molten state for later use; mixing coarse aggregate and fine aggregate, preheating in an oven at 180-200 ℃ for 3-4 hours for later use; respectively mixing wave-absorbing materials with different mixing amounts with the mineral powder, and preheating to 170-180 ℃ for later use;
b. mixing and stirring lignin fibers, heated coarse aggregates and heated fine aggregates, then adding wave-absorbing materials with different mixing amounts and mineral powder, mixing and re-stirring, and finally adding heated modified asphalt and stirring to prepare the wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks.
7. The preparation method of the wave-absorbing asphalt mixture capable of rapidly repairing the cracks of the asphalt pavement according to claim 6, which is characterized by comprising the following steps: in the step a, the mixing amount of the wave-absorbing material is 10%, 20% and 30% of the volume fraction of the mineral powder.
8. The preparation method of the wave-absorbing asphalt mixture capable of quickly repairing asphalt pavement cracks according to claim 7 is characterized by comprising the following steps: in the step b, the stirring time is 80-100s.
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