CN110698114A - Preparation method of silicon carbide modified asphalt concrete - Google Patents
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- CN110698114A CN110698114A CN201910963687.1A CN201910963687A CN110698114A CN 110698114 A CN110698114 A CN 110698114A CN 201910963687 A CN201910963687 A CN 201910963687A CN 110698114 A CN110698114 A CN 110698114A
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1062—Metals
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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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Abstract
The invention discloses a preparation method of silicon carbide modified asphalt concrete, which comprises the steps of plating an iron film with the thickness of 3-5nm on silicon carbide fibers by a chemical vapor deposition method, and doping the silicon carbide fibers after film plating into asphalt; mixing materials according to a grading design, placing the heated aggregate into a stirring pot, stirring for 90s, pouring the modified asphalt into the stirring pot, and stirring for 90 s; and putting the mineral powder into an oven to be heated to 170 ℃, then pouring the heated mineral powder into a stirring pot to be stirred until the mineral powder is uniformly mixed, and filling, compacting and demoulding the mixed asphalt mixture to prepare the silicon carbide modified asphalt concrete. The method has simple preparation process and safe operation, and the prepared asphalt concrete has obviously improved heating effect and heating rate and simultaneously improves the strength of the asphalt concrete.
Description
Technical Field
The invention belongs to the technical field of pavement engineering materials, and relates to a preparation method of silicon carbide modified asphalt concrete.
Background
Asphalt concrete pavements are becoming larger and larger worldwide and are increasing. Under the long-term action of load and natural factors, various performances of the asphalt concrete pavement are gradually reduced, and the pavement is subjected to fatigue failure. Therefore, maintenance of asphalt concrete pavement is essential to ensure sufficient strength and rigidity, sufficient stability, durability and surface flatness during operation of the asphalt concrete pavement. The traditional asphalt concrete repairing technology has the problems of large consumption of manpower and material resources, low working efficiency, poor repairing effect and the like. Therefore, the method for improving the disease problem of the asphalt concrete by finding a reasonable method has important practical significance, and the silicon carbide modified asphalt concrete with the intelligent repairing function can just solve the problems.
The tiny cracks of the asphalt pavement are realized through the self-repairing function of the asphalt. The self-repairing speed of the traditional asphalt concrete is low, the effect is not good enough, and the self-repairing capability of the asphalt concrete modified by the wave-absorbing material can be greatly improved. However, for traditional wave-absorbing materials such as steel fibers, when the external temperature is too high and the sunlight is strong, the steel fiber asphalt concrete is used as a good conductor, and the steel fiber asphalt concrete is easy to absorb heat and raise the temperature, so that the internal temperature of the asphalt concrete is higher, diseases such as wheel tracks are easy to generate, and the aging of the internal structure is accelerated. And the silicon carbide is not easy to absorb heat, so that the problems are not worried about. For the magnetic wave-absorbing material, the magnetic metal powder is easy to rust and passivate, so that the wave-absorbing capability is poor, and the pavement is easy to loose, crack and other diseases due to poor wettability with asphalt. Therefore, the traditional wave-absorbing material can not enable the asphalt concrete to achieve ideal repairing effect. The problems can be avoided by using the silicon carbide modified asphalt concrete under the action of microwaves, so that the asphalt concrete has excellent self-repairing capability.
Although the electrical loss material such as graphite and metal powder has high conductivity and large attenuation coefficient, the material is electrically consumed under ideal conditionsThe efficiency of converting magnetic energy into heat energy is high. However, due to the impedance mismatch with air, electromagnetic waves are difficult to enter the surface of the material, thereby forming reflected waves, and thus the high-conductivity material is difficult to become a microwave absorbing material. On the contrary, for some mutually insulated fibers and conductive fibers, the conductance loss is more because of a certain resistance. Therefore, a good conductor is not the best choice when selecting an electrically lossy material, and conversely, a semiconductor material with certain insulating properties is selected to be more reliable and efficient in generating heat energy by virtue of its resistive loss. The silicon carbide material is used as a semiconductor material, has adjustable conductivity within a certain range, is easy to match impedance with air, and is an excellent wave-absorbing material. But the pure silicon carbide material has higher resistance which can reach 109-1010Omega cm, less dielectric loss, difficult to achieve the ideal wave absorbing effect, and can be used for coating the silicon carbide material. Magnetic materials or elements are introduced to adjust the dielectricity and reduce the resistivity to achieve the required wave-absorbing effect, so that the wave-absorbing material with wider frequency absorption range is prepared. The excellent wave-absorbing performance of the silicon carbide subjected to coating treatment greatly increases the wave-absorbing performance of the asphalt concrete, thereby improving the self-repairing capability of the asphalt concrete. The silicon carbide material has the characteristics that the silicon carbide is subjected to film coating treatment to change the dielectric property and improve the wave absorbing performance, and meanwhile, the silicon carbide is used as a modified material for improving the microwave absorbing performance of asphalt concrete aiming at the problem of repairing the current asphalt pavement diseases.
Disclosure of Invention
In order to realize the purpose, the invention provides a preparation method of silicon carbide modified asphalt concrete, the heating effect and the heating rate of the prepared asphalt concrete are obviously improved, and the strength of the asphalt concrete is also improved; the preparation method has simple process and safe operation; the pavement repairing efficiency is high, and the repairing effect is obvious.
The technical scheme adopted by the invention is that the preparation method of the silicon carbide modified asphalt concrete comprises the following steps:
step S1: soaking the silicon carbide fiber in an acetone solution for 2 hours, taking out and cleaning the silicon carbide fiber by using distilled water;
step S2: putting the silicon carbide fiber into a drying oven, and drying at 100 ℃ for 2 hours;
step S3: plating an iron film with the thickness of 3-5nm on the dried silicon carbide fiber by adopting a chemical vapor deposition method;
step S4: heating the asphalt to 160 ℃, doping the coated silicon carbide fiber into the asphalt, and fully stirring by using a high-speed shearing instrument to obtain modified asphalt;
step S5: putting the cleaned aggregate into a drying oven, and drying at 105 +/-5 ℃ to constant weight;
step S6: proportioning according to a grading design, then putting the proportioned aggregate into an oven, and heating to 170 ℃;
step S7: heating the stirring pot to 163 ℃, then placing the heated aggregate in the stirring pot, and stirring for 90 s;
step S8: pouring the modified asphalt into a stirring pot, and stirring for 90 s;
step S9: putting the mineral powder into an oven, heating to 170 ℃, then pouring the heated mineral powder into a stirring pot for stirring until the mineral powder is uniformly mixed, and keeping the asphalt mixture in a required mixing range;
step S10: and (3) putting the mould into an oven, heating to 105 ℃, filling the mixed asphalt mixture into the mould at the temperature of 145 ℃, compacting and demoulding according to the technical specification requirement to prepare the silicon carbide modified asphalt concrete.
Further, the length of the silicon carbide fiber is 1-3 mm.
Further, in the step S3, the CVD method uses carbonyl iron as the coating material, the carbonyl iron is heated to 155 ℃ at a heating rate of 15-20 ℃/min, Ar gas is used as the carrier gas, and the flow rate of the carrier gas is 300sccm to perform coating.
Furthermore, AH-70 asphalt is adopted as the asphalt, and the mass ratio of the asphalt to the aggregate is 5%.
Further, in step S4, the silicon carbide fiber after coating is blended according to 1-5% of the mass of the asphalt.
Furthermore, the aggregate is limestone, and the particle size of 11-16 mm accounts for 23.2% of the total mass of the mineral aggregate, the particle size of 5-11 mm accounts for 25% of the total mass of the mineral aggregate, and the particle size of 0-5 mm accounts for 47% of the total mass of the mineral aggregate.
Furthermore, the mineral powder is limestone, and accounts for 4.8% of the total mass of the mineral aggregate.
The invention has the beneficial effects that: according to the invention, the wave absorbing performance of the silicon carbide fiber under the microwave action is fully combined, the asphalt concrete with the microwave absorbing performance is prepared, the heating effect and the heating rate of the asphalt concrete are obviously improved, and meanwhile, the strength of the asphalt concrete is also improved; the preparation method is simple in process and safe to operate, only a microwave heating vehicle is needed to heat the original pavement during pavement repair, the pavement repair efficiency is high, the repair effect is obvious, and time and labor are saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the preparation of silicon carbide modified asphalt concrete;
FIG. 2 is a schematic representation of a silicon carbide modified asphalt concrete grading curve;
FIGS. 3a-b are schematic diagrams illustrating the analysis of dielectric loss and magnetic loss, respectively, of a silicon carbide fiber after coating;
FIG. 4 is a schematic representation of the reflection loss analysis of silicon carbide fibers after coating;
FIG. 5 is a schematic diagram showing the temperature change of asphalt concrete with different silicon carbide contents under microwave heating;
FIG. 6 is a graph showing the temperature rise rate of asphalt concrete with different silicon carbide contents under microwave heating;
fig. 7 is a schematic view of the infrared thermal imager radiation under microwave heating.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.
Example 1
As shown in figure 1, the silicon carbide fiber with the length of 1-3mm is put in acetone solution to be soaked for 2 hours, then taken out and cleaned by distilled water, and the protective layer on the surface of the silicon carbide fiber is removed; putting the silicon carbide fiber into a drying oven, and drying at 100 ℃ for 2 hours; and (3) utilizing chemical vapor deposition equipment, taking carbonyl iron as a coating material, heating the carbonyl iron to 155 ℃ at the heating rate of 15 ℃/min, taking Ar gas as a carrier gas, and plating an iron film with the thickness of 3nm on the dried silicon carbide fiber at the carrier gas flow rate of 100 sccm. AH-70 asphalt is adopted and heated to 160 ℃, then the silicon carbide fiber after coating is mixed according to 5 percent of the dosage of the asphalt, and the high-speed shearing instrument is utilized to fully stir, thereby ensuring that the silicon carbide fiber is uniformly dispersed in the asphalt.
The grading design is carried out by adopting an AC-13 type asphalt mixture, aggregates (coarse aggregates and fine aggregates) adopt limestone, the particle composition is that the particle size of 11-16 mm accounts for 23.2 percent of the total mass of mineral aggregate, the particle size of 5-11 mm accounts for 25 percent of the total mass of mineral aggregate, the particle size of 0-5 mm accounts for 47 percent of the total mass of mineral aggregate, the mineral powder adopts limestone and accounts for 4.8 percent of the total mass of mineral aggregate, and the mass ratio (the oil-stone ratio) of asphalt to the aggregates is 5 percent.
Firstly, cleaning the aggregate, then placing the aggregate into a drying oven, and drying the aggregate at the temperature of 105 +/-5 ℃ to constant weight; then placing the prepared aggregate into an oven, and placing the dried aggregate into the oven to be heated to 170 ℃; heating the stirring pot to 163 ℃, then placing the heated aggregates into the stirring pot, and stirring for 90s to ensure that the aggregates are fully mixed; pouring the modified asphalt into a stirring pot, and stirring for 90 s; putting the mineral powder into an oven, heating to 170 ℃, then pouring the heated mineral powder into a stirring pot, stirring until the mineral powder is uniformly mixed, and keeping the asphalt mixture in a required mixing range.
And (3) putting the mould into an oven, heating to 105 ℃, filling and moulding the mixed asphalt mixture into a Marshall standard test piece at the temperature of 145 ℃, compacting by using a compaction instrument at the temperature meeting the requirement, wherein the compacting times of the front surface and the back surface are respectively 75 times, immediately taking off the paper on the upper surface and the lower surface by using tweezers after the test piece is formed, transversely placing the test mould, cooling to room temperature, and removing the test piece by using a demoulding machine to prepare the silicon carbide modified asphalt concrete.
Example 2
As shown in figure 1, the silicon carbide fiber with the length of 1-3mm is put in acetone solution to be soaked for 2 hours, then taken out and cleaned by distilled water, and the protective layer on the surface of the silicon carbide fiber is removed; putting the silicon carbide fiber into a drying oven, and drying at 100 ℃ for 2 hours; and (3) utilizing chemical vapor deposition equipment, taking carbonyl iron as a coating material, heating the carbonyl iron to 155 ℃ at the heating rate of 18 ℃/min, taking Ar gas as a carrier gas, and plating an iron film with the thickness of 4nm on the dried silicon carbide fiber at the carrier gas flow rate of 200 sccm. AH-70 asphalt is adopted and heated to 160 ℃, then the silicon carbide fiber after coating is mixed according to 4 percent of the dosage of the asphalt, and the high-speed shearing instrument is utilized to fully stir, thereby ensuring that the silicon carbide fiber is uniformly dispersed in the asphalt.
The grading design is carried out by adopting an AC-13 type asphalt mixture, aggregates (coarse aggregates and fine aggregates) adopt limestone, the particle composition is that the particle size of 11-16 mm accounts for 23.2 percent of the total mass of mineral aggregate, the particle size of 5-11 mm accounts for 25 percent of the total mass of mineral aggregate, the particle size of 0-5 mm accounts for 47 percent of the total mass of mineral aggregate, the mineral powder adopts limestone and accounts for 4.8 percent of the total mass of mineral aggregate, and the mass ratio (the oil-stone ratio) of asphalt to the aggregates is 5 percent.
Firstly, cleaning the aggregate, then placing the aggregate into a drying oven, and drying the aggregate at the temperature of 105 +/-5 ℃ to constant weight; then placing the prepared aggregate into an oven, and placing the dried aggregate into the oven to be heated to 170 ℃; heating the stirring pot to 163 ℃, then placing the heated aggregates into the stirring pot, and stirring for 90s to ensure that the aggregates are fully mixed; pouring the modified asphalt into a stirring pot, and stirring for 90 s; putting the mineral powder into an oven, heating to 170 ℃, then pouring the heated mineral powder into a stirring pot, stirring until the mineral powder is uniformly mixed, and keeping the asphalt mixture in a required mixing range.
And (3) putting the mould into an oven, heating to 105 ℃, filling and moulding the mixed asphalt mixture into a Marshall standard test piece at the temperature of 145 ℃, compacting by using a compaction instrument at the temperature meeting the requirement, wherein the compacting times of the front surface and the back surface are respectively 75 times, immediately taking off the paper on the upper surface and the lower surface by using tweezers after the test piece is formed, transversely placing the test mould, cooling to room temperature, and removing the test piece by using a demoulding machine to prepare the silicon carbide modified asphalt concrete.
Example 3
As shown in figure 1, the silicon carbide fiber with the length of 1-3mm is put in acetone solution to be soaked for 2 hours, then taken out and cleaned by distilled water, and the protective layer on the surface of the silicon carbide fiber is removed; putting the silicon carbide fiber into a drying oven, and drying at 100 ℃ for 2 hours; and (3) utilizing chemical vapor deposition equipment, taking carbonyl iron as a coating material, heating the carbonyl iron to 155 ℃ at the heating rate of 20 ℃/min, taking Ar gas as a carrier gas, and plating an iron film with the thickness of 5nm on the dried silicon carbide fiber at the carrier gas flow rate of 300 sccm. AH-70 asphalt is adopted and heated to 160 ℃, then the silicon carbide fiber after coating is mixed according to 2 percent of the dosage of the asphalt, and the high-speed shearing instrument is utilized to fully stir, thereby ensuring that the silicon carbide fiber is uniformly dispersed in the asphalt.
The grading design is carried out by adopting an AC-13 type asphalt mixture, aggregates (coarse aggregates and fine aggregates) adopt limestone, the particle composition is that the particle size of 11-16 mm accounts for 23.2 percent of the total mass of mineral aggregate, the particle size of 5-11 mm accounts for 25 percent of the total mass of mineral aggregate, the particle size of 0-5 mm accounts for 47 percent of the total mass of mineral aggregate, the mineral powder adopts limestone and accounts for 4.8 percent of the total mass of mineral aggregate, and the mass ratio (the oil-stone ratio) of asphalt to the aggregates is 5 percent.
Firstly, cleaning the aggregate, then placing the aggregate into a drying oven, and drying the aggregate at the temperature of 105 +/-5 ℃ to constant weight; then placing the prepared aggregate into an oven, and placing the dried aggregate into the oven to be heated to 170 ℃; heating the stirring pot to 163 ℃, then placing the heated aggregates into the stirring pot, and stirring for 90s to ensure that the aggregates are fully mixed; pouring the modified asphalt into a stirring pot, and stirring for 90 s; putting the mineral powder into an oven, heating to 170 ℃, then pouring the heated mineral powder into a stirring pot, stirring until the mineral powder is uniformly mixed, and keeping the asphalt mixture in a required mixing range.
And (3) putting the mould into an oven, heating to 105 ℃, filling and moulding the mixed asphalt mixture into a Marshall standard test piece at the temperature of 145 ℃, compacting by using a compaction instrument at the temperature meeting the requirement, wherein the compacting times of the front surface and the back surface are respectively 75 times, immediately taking off the paper on the upper surface and the lower surface by using tweezers after the test piece is formed, transversely placing the test mould, cooling to room temperature, and removing the test piece by using a demoulding machine to prepare the silicon carbide modified asphalt concrete.
Fig. 2 shows a grading distribution curve of the asphalt concrete of this embodiment, because the silicon carbide fibers are mainly present in the fine aggregate and the mineral powder, and in order to ensure that a complete network structure is formed inside the concrete, a suspension dense structure is selected for the test, and an AC-13 type asphalt mixture is used for grading design.
Fig. 3a-b show the dielectric loss and the magnetic loss of the silicon carbide fiber after the coating of the embodiment, and it can be seen from the graphs that the dielectric loss of the silicon carbide fiber is gradually increased at a low frequency, the magnetic loss is increased and then decreased, and reaches a maximum value between the frequency of 2.4GHz and 2.8GHz, so that it can be seen that the dielectric loss and the magnetic loss of the silicon carbide fiber are large at a low frequency, and the silicon carbide fiber shows good wave-absorbing performance.
Fig. 4 is a schematic diagram showing the analysis of the reflection loss of the silicon carbide fiber after the coating of the embodiment, and it can be known from the diagram that the reflection loss can reach maximum-23.323 dB at 2.48GH, and according to the transmission line theory, the microwave absorption can reach more than 90%, the minimum reflection loss is-9 dB, and the microwave absorption rate is nearly 90%. Therefore, the coated silicon carbide fiber is a good microwave absorbing material under microwave.
The experimental silicon carbide modified asphalt concrete microwave heating device adopts a light wave oven, can ensure that microwaves are uniformly emitted from the bottom, and has the heating frequency of 2.45GHz and the heating time of 5 min. And the temperature acquisition device adopts an FLIR thermal infrared imager to acquire and analyze the temperature of the surface of the test piece at intervals of 30 s. Fig. 5 is a schematic diagram showing the temperature change rule of the asphalt concrete with different silicon carbide doping amounts under microwave heating, and it can be seen from the diagram that under microwave heating, the silicon carbide doping has a certain promotion effect on the temperature rise of the asphalt concrete, and the promotion effect is more obvious along with the increase of the silicon carbide doping amount, when the silicon carbide doping amount reaches 5%, the temperature rise within 5min can reach 43.9 ℃, which is 8.7 ℃ higher than that of the common asphalt concrete. Therefore, when the doping amount of the silicon carbide is 5%, the microwave loss performance of the asphalt concrete can be obviously improved.
FIG. 6 is a schematic diagram showing the temperature rise rate of asphalt concrete with different silicon carbide contents under microwave heating, and it can be seen from the diagram that the temperature rise rate of asphalt concrete with silicon carbide is increased under microwave heating, wherein when the contents are 1%, 2% and 3%, the increase of the temperature rise rate is not obvious, and is only 0.01 ℃/S higher than that of ordinary asphalt concrete. When the doping amount is 4% and 5%, the heating rate is obviously improved by about 0.03 ℃/S compared with the common asphalt concrete, and the main reason is that along with the increase of the doping amount of the silicon carbide, the silicon carbide fibers are uniformly distributed in the asphalt concrete to form a complete network, so that the heating rate of the asphalt concrete is accelerated.
Fig. 7 is a schematic view showing the radiation of the infrared thermal imaging instrument under microwave heating, and it can be seen from the figure that under microwave heating, the imaging instrument shows uniform color distribution, and asphalt concrete is heated more uniformly. The silicon carbide fiber can be uniformly dispersed in the asphalt concrete, and when the asphalt concrete is heated by microwave, the silicon carbide fiber absorbs the microwave, so that the asphalt concrete is uniformly heated.
The Marshall stability and the flow value of the asphalt concrete with different silicon carbide mixing amounts are measured through tests, the results are shown in Table 1, and the test data show that the stability is gradually increased and the flow value is reduced along with the increase of the silicon carbide fiber mixing amount, which indicates that the strength of the modified asphalt concrete is improved.
TABLE 1 Marshall stability and flow values of silicon carbide modified asphalt concrete
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. The preparation method of the silicon carbide modified asphalt concrete is characterized by comprising the following steps:
step S1: soaking the silicon carbide fiber in an acetone solution for 2 hours, taking out and cleaning the silicon carbide fiber by using distilled water;
step S2: putting the silicon carbide fiber into a drying oven, and drying at 100 ℃ for 2 hours;
step S3: plating an iron film with the thickness of 3-5nm on the dried silicon carbide fiber by adopting a chemical vapor deposition method;
step S4: heating the asphalt to 160 ℃, doping the coated silicon carbide fiber into the asphalt, and fully stirring by using a high-speed shearing instrument to obtain modified asphalt;
step S5: putting the cleaned aggregate into a drying oven, and drying at 105 +/-5 ℃ to constant weight;
step S6: proportioning according to a grading design, then putting the proportioned aggregate into an oven, and heating to 170 ℃;
step S7: heating the stirring pot to 163 ℃, then placing the heated aggregate in the stirring pot, and stirring for 90 s;
step S8: pouring the modified asphalt into a stirring pot, and stirring for 90 s;
step S9: putting the mineral powder into an oven, heating to 170 ℃, then pouring the heated mineral powder into a stirring pot for stirring until the mineral powder is uniformly mixed, and keeping the asphalt mixture in a required mixing range;
step S10: and (3) putting the mould into an oven, heating to 105 ℃, filling the mixed asphalt mixture into the mould at the temperature of 145 ℃, compacting and demoulding according to the technical specification requirement to prepare the silicon carbide modified asphalt concrete.
2. The method for preparing silicon carbide modified asphalt concrete according to claim 1, wherein the length of the silicon carbide fiber is 1-3 mm.
3. The method as claimed in claim 1, wherein the chemical vapor deposition process in step S3 comprises heating carbonyl iron to 155 ℃ at a temperature increasing rate of 15-20 ℃/min, and coating with Ar gas as carrier gas at a flow rate of 100 and 300 sccm.
4. The method for preparing the silicon carbide modified asphalt concrete according to claim 1, wherein AH-70 asphalt is adopted as the asphalt, and the mass ratio of the asphalt to the aggregate is 5%.
5. The method of claim 1, wherein in step S4, the silicon carbide fiber coated with the coating is blended in an amount of 2-5% by mass of the asphalt.
6. The method for preparing silicon carbide modified asphalt concrete according to claim 1, wherein limestone is used as the aggregate, and the particle composition is 11mm to 16mm in particle size accounting for 23.2% of the total mass of the mineral aggregate, 5mm to 11mm in particle size accounting for 25% of the total mass of the mineral aggregate, and 0mm to 5mm in particle size accounting for 47% of the total mass of the mineral aggregate.
7. The method for preparing the silicon carbide modified asphalt concrete according to claim 1, wherein the mineral powder is limestone, and accounts for 4.8% of the total mass of the mineral material.
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| CN113461354A (en) * | 2021-07-01 | 2021-10-01 | 中南大学 | Si with function of improving microwave absorption performance of asphalt concrete pavement3N4Preparation method and application of/Fe composite powder |
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