CN115259756A - Magnetism-gathering type pavement material for automobile dynamic induction charging and preparation method thereof - Google Patents
Magnetism-gathering type pavement material for automobile dynamic induction charging 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
- C04B2111/00422—Magnetic properties
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y02P40/00—Technologies relating to the processing of minerals
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention relates to a magnetic-gathering pavement material for automobile dynamic induction charging and a preparation method thereof, wherein the magnetic-gathering pavement material comprises the following ingredients: the geopolymer slurry comprises alkaline excitant, water, fly ash with silicon-aluminum activity composed of silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron, granulated blast furnace slag, red mud, metakaolin, coconut ash and other alkaline active materials, and the molar ratio of SiO2 to Al2O3 in the components of the geopolymer slurry is 3.0 to 5.6. The dynamic induction charging system can effectively realize the convergence of a magnetic field, reduce magnetic leakage, further reduce energy loss in the induction charging process, solve the problem of lower charging efficiency of the conventional dynamic induction charging pavement system, and has the advantages of excellent electromagnetic performance, good mechanical performance, low cost, energy conservation, environmental protection and the like.
Description
Technical Field
The invention relates to the technical field of inorganic composite materials, in particular to a magnetism-gathering type pavement material for automobile dynamic induction charging and a preparation method thereof.
Background
According to statistics, the carbon emission in the national transportation field in 2021 accounts for 15% of the national terminal carbon emission, wherein the proportion of the road traffic in the whole carbon emission in the transportation industry is up to 84%, and the carbon emission is an important point of emission reduction. In recent years, along with the increasing attention on environmental protection and carbon emission, electric vehicles have been developed rapidly and become one of the important solutions for reducing carbon emission. However, due to the limitation of battery technology, the electric vehicle has the problems of short endurance mileage, frequent charging times, overlong charging time and the like at the present stage, and the development and popularization of the electric vehicle are severely restricted by the problems.
To solve this problem, a dynamic induction charging road is developed. The dynamic induction charging pavement system can realize real-time charging of the electric automobile by utilizing the basic principle of wireless induction charging, so that the dependence of the electric automobile industry on high-performance batteries is reduced, and the popularization of the electric automobile is promoted. Compared with the traditional pile type charging method, the dynamic wireless induction charging realizes the energy supplement of the battery in the running process of the vehicle, and has great advantages in reliability, safety, convenience and user friendliness. However, the magnetic field trend is difficult to control, and the magnetic field has a serious magnetic leakage phenomenon in the spatial distribution, that is, a large part of magnetic induction lines of the alternating magnetic field leak into the space and do not pass through an induction medium in an induction surface layer, and the magnetic energy is greatly lost in the lower surface layer, so that energy waste is caused, the energy conversion efficiency is seriously influenced, and the charging effect is not ideal.
Disclosure of Invention
The invention provides a magnetic concentration type pavement material for automobile dynamic induction charging and a preparation method thereof, aiming at the defects of the prior art.
In order to solve the technical problems, the invention adopts the technical scheme that:
a magnetic gathering pavement material for dynamic induction charging of automobiles comprises geopolymer slurry and a magnetizer which are uniformly mixed, wherein the geopolymer slurry comprises a composite alkali activator, water and alkali active powder which are uniformly mixed, the composite alkali activator comprises one or more of supplementary evaporated water, water glass, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate and solid sodium silicate, and the alkali active powder is an alkali active material with silicon-aluminum activity and composed of silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons.
As a further preferred aspect of the present invention, the alkali-active powder is fly ash having a silicoaluminophosphate activity composed of silica tetrahedron and aluminoxy tetrahedron, granulated blast furnace slag, red mud, metakaolin, or coconut ash.
More preferably, the modulus of the water glass is 0.8 to 4.0, the baume degree of the water glass is 32.0 to 44.0, the sodium oxide content of the water glass is not less than 8wt%, and the silica content of the water glass is not less than 25wt%.
In a further preferred embodiment of the present invention, the water-to-solid ratio of the copolymer slurry is 0.3 to 0.5.
Further preferably, siO in the alkali activated powder is2With Al2O3The molar ratio of (b) is 3.0 to 5.6.
In a further preferred embodiment of the present invention, the mass of the magnetizing agent is 40 to 60% of the total mass of the geopolymer slurry and the magnetizing agent.
In a further preferred embodiment of the present invention, the magnetizing agent is an iron powder having a particle size ranging from 15 to 150 μm.
As a further optimization of the invention, the compound alkali activator comprises water, water glass and sodium hydroxide which are supplemented to be evaporated, the purity of the sodium hydroxide in the compound alkali activator is more than or equal to 96 percent, and the dosage ratio of the sodium hydroxide to the water glass is as follows: 3.5 to 6.8.
A preparation method of a magnetism-gathering type pavement material for automobile dynamic induction charging comprises the following steps: step 1, preparing a clear mixed solution: weighing sodium hydroxide and water glass according to the proportion of the using amount
Adding sodium hydroxide into water glass for multiple times, and continuously stirring until the sodium hydroxide is completely dissolved to obtain a clear mixed solution with the modulus of 0.8 to 3.2 and the concentration of more than or equal to 40 wt%; step 2, preparing a composite alkali activator: standing the clear mixed solution, cooling to room temperature, supplementing evaporated water, namely adding the supplemented evaporated water until the total mass of the clear mixed solution is equal to the total mass of the weighed sodium hydroxide and the weighed water glass, and uniformly stirring to obtain the required compound alkali activator; step 3, preparing geopolymer slurry: mixing the composite alkali activator and the alkali active powder material, adding water, and stirring uniformly to obtain geopolymer slurry; the water-solid ratio of the geopolymer slurry is 0.3 to 0.5 by weight; and SiO in the components contained in the geopolymer slurry2With Al2O3The molar ratio of (A) to (B) is 3.0 to 5.6; step 4, magnetization treatment: and (3) weighing a magnetizer, adding the magnetizer into the geopolymer slurry prepared in the step (3), and stirring until the mixture is uniformly mixed to prepare a semi-finished product of the magnetism-gathering type pavement material, wherein the doping amount of the magnetizer accounts for 40-60% of the total mass of the geopolymer slurry and the magnetizer.
As a further preferred aspect of the present invention, the method further comprises the step 5 of curing: and pouring the semi-finished product of the magnetic concentrating pavement material into a mold, placing the mold into a standard curing box with the temperature of 25 ℃ and the humidity of 95 percent for curing for 28 days, and removing the mold to obtain a finished product of the magnetic concentrating pavement material.
The invention has the following beneficial effects:
the magnetic-gathering pavement material for the dynamic induction charging of the automobile has the advantages that the saturation magnetization is 180 to 620emu/kg, the resistivity is 6000 to 70000 omega.m, the electromagnetic performance is excellent, a magnetic field can be effectively gathered, the magnetic leakage is reduced, the loss of magnetic energy in a lower layer is reduced, the problem of low energy transmission efficiency of the current dynamic induction charging pavement is effectively solved, and the contribution is made to the improvement of the readiness of the induction charging pavement technology; the 28d compressive strength is 25 to 50MPa, the 28d bending tensile strength is 5 to 10MPa, and the mechanical properties are good, so that the material can be well adapted to the original road structure environment, and the occurrence of road diseases is reduced. On the other hand, the invention uses the industrial waste materials such as the fly ash, the blast furnace slag and the like as the raw materials for producing the geopolymer slurry, thereby changing waste into valuable, having lower cost, effectively reducing environmental pollution and having important significance for the building productivity and the environmental protection of China.
Drawings
FIG. 1 is a flow chart of the preparation of the magnetic concentration type pavement material for automobile dynamic induction charging.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a magnetic concentrating pavement material for dynamic induction charging of an automobile, which is characterized by comprising the following ingredients: the components of the geopolymer slurry are preferably fly ash, granulated blast furnace slag, composite alkali activator and water, and the components of the geopolymer slurry comprise SiO2With Al2O3The molar ratio of (B) is 3.0 to 5.6.
The embodiment of the invention also provides a preparation method of the magnetic concentration type pavement material for the dynamic induction charging of the automobile, which comprises the following steps:
(1) Preparing geopolymer slurry: preparing a certain amount of composite alkali activator, mixing with the alkali active powder material, adding water, and stirring uniformly to obtain geopolymer slurry. The water-solid ratio of the geopolymer slurry is 0.3 to 0.5 by weight; and SiO in the components contained in the geopolymer slurry2With Al2O3The molar ratio of (B) is 3.0 to 5.6.
(2) Magnetization treatment: and weighing a certain amount of magnetizer, adding the magnetizer into the prepared geopolymer slurry, and stirring until the magnetizer and the geopolymer slurry are uniformly mixed. The doping amount of the magnetizer accounts for 40-60% of the magnetism-gathering pavement material by weight.
(3) And (5) maintenance: pouring into a mold, placing into a standard curing box with the temperature of 25 ℃ and the humidity of 95 percent, curing for 28 days, and removing the mold to obtain a finished product of the magnetic gathering type pavement material.
The present invention will be described in further detail with reference to specific examples.
Example 1
Weighing the following raw materials by mass: according to the weight percentage, the fly ash, the granulated blast furnace slag, the sodium hydroxide, the water glass and the iron powder are mixed, wherein the fly ash and the SiO in the blast furnace slag2With Al2O3Weighing the materials according to the molar ratio of 3.5, weighing water according to the water-solid ratio of 0.3, and mixing the geopolymer slurry and the iron powder according to the mass ratio of 1:1 weighing iron powder, and preparing the magnetism-gathering type pavement material at the temperature of 25 ℃ according to the following preparation method. The magnetic gathering pavement material for automobile dynamic induction charging has the saturated magnetization of 180 to 620emu/kg, the resistivity of 6000 to 70000 omega.m, the 28-day compressive strength of 25 to 50MPa and the 28-day bending tensile strength of 5 to 10MPa.
Referring to fig. 1, the preparation method is as follows:
s1, preparing geopolymer slurry:
s1.1, weighing 193g of sodium hydroxide, dissolving the sodium hydroxide in 1000g of water glass, fully stirring for 4min, sealing, standing, cooling to room temperature, and supplementing evaporated water to prepare the composite alkali activator with the modulus of 1.2 and the concentration of 42.58wt%, wherein the water glass is water glass for buildings, the modulus of the water glass is 0.8 to 4.0, the baume degree of the water glass is 32.0 to 44.0, and the content of sodium oxide and the content of silicon dioxide are not less than 8wt% and 25wt% respectively.
S1.2, uniformly mixing the fly ash and blast furnace slag to obtain composite powder, adding the prepared alkali activator and the composite powder into a stirring pot, adding a proper amount of water, adding water, and fully stirring until the mixture is uniform to obtain geopolymer slurry.
S2, magnetization treatment: 400g of the slurry is taken, 400g of equal amount of iron powder with the particle size of 30 mu m is added, and the mixture is vibrated for 15min until the mixture is fully mixed.
S3, maintenance: pouring the mixture into a mold, demolding after curing for 24 hours with the mold, and curing the sample in a standard curing box with the temperature of 25 ℃ and the humidity of 95% for 28 days after demolding to obtain a finished product of the magnetic concentrating pavement material.
The method for testing the electromagnetic performance and the mechanical performance of the prepared magnetic gathering type pavement material comprises the following steps:
(1) Saturation magnetization: a cubic sample having a size of 2mm by 2mm was prepared, and the saturation magnetization of the sample was measured under the application of a 2T magnetic field using a shaker type LakeShore-7404.
(2) Resistivity: cylindrical samples with the diameter of 100mm and the height of 50mm are manufactured, copper sheets with the diameter of 100mm and the thickness of 1mm are attached to the two bottom surfaces to serve as parallel electrodes, and the resistivity of the samples is measured by using a TongHui model 2830 LCR tester.
(3) Compressive strength: the compressive strength of a rectangular parallelepiped test piece having a size of 40 mm by 40 mm was measured by placing the test piece in a compressive strength tester and applying the test piece at a rate of 1 KN/s.
(4) Bending tensile strength: the flexural tensile strength of the sample was measured by placing a rectangular parallelepiped test piece having dimensions of 40 mm by 160mm in a flexural strength tester, and loading at a rate of 1 KN/s.
The main performance indexes of the magnetism-gathering pavement material for the dynamic induction charging of the automobile, which is prepared by the example, are tested according to the test method as follows: the saturation magnetization was 193.4emu/kg, the resistivity was 6300. Omega. M, the compressive strength was 27.8MPa, and the flexural tensile strength was 9.6MPa.
Example 2
Weighing the following raw materials by mass: according to the weight percentage, the fly ash, the granulated blast furnace slag, the sodium hydroxide, the water glass and the iron powder are mixed, wherein the fly ash and the SiO in the blast furnace slag2With Al2O3Weighing the materials according to the molar ratio of 3.8, weighing water according to the water-solid ratio of 0.3, and mixing the geopolymer slurry and the iron powder according to the mass ratio of 1:1 weighing iron powder, and preparing the magnetism-gathering type pavement material at the temperature of 25 ℃ according to the following preparation method.
The main performance indexes of the foam concrete prepared by the embodiment based on the silicate-aluminosilicate composite cementing material system are tested according to the test method in the embodiment 1: the magnetic gathering pavement material for the dynamic induction charging of the automobile has the main performance indexes that: the saturation magnetization was 610.9emu/kg, the resistivity was 30000. Omega. M, the compressive strength was 48.3MPa, and the flexural tensile strength was 9.8MPa.
Example 3
Weighing the following raw materials by mass: according to the weight percentage, the fly ash, the granulated blast furnace slag, the sodium hydroxide, the water glass and the iron powder are mixed, wherein the fly ash and the SiO in the blast furnace slag2With Al2O3Weighing the materials according to the molar ratio of 4.0, weighing water according to the water-solid ratio of 0.3, and mixing the geopolymer slurry and the iron powder according to the mass ratio of 1:1 weighing iron powder, and preparing the magnetism-gathering type pavement material at the temperature of 25 ℃ according to the following preparation method.
The main performance indexes of the foam concrete prepared by the example based on the silicate-aluminosilicate composite gelled material system are tested according to the test method in the example 1 and are as follows: the magnetic gathering pavement material for the dynamic induction charging of the automobile has the main performance indexes that: the saturation magnetization is 387.3emu/kg, the resistivity is 54900 omega.m, the compressive strength is 38.3MPa, and the bending tensile strength is 14.2MPa.
Example 4
Weighing the following raw materials by mass: according to the weight percentage, the fly ash, the granulated blast furnace slag, the sodium hydroxide, the water glass and the iron powder are mixed, wherein the fly ash and the SiO in the blast furnace slag2With Al2O3Weighing the materials according to the molar ratio of 4.2, weighing water according to the water-solid ratio of 0.3, and mixing the geopolymer slurry and the iron powder according to the mass ratio of 1:1 weighing iron powder, and preparing the magnetism-gathering type pavement material at the temperature of 25 ℃ according to the following preparation method.
The main performance indexes of the foam concrete prepared by the embodiment based on the silicate-aluminosilicate composite cementing material system are tested according to the test method in the embodiment 1: the magnetic gathering pavement material for the dynamic induction charging of the automobile has the main performance indexes that: the saturation magnetization was 249.7emu/kg, the resistivity was 70000. Omega. M, the compressive strength was 32.1MPa, and the flexural tensile strength was 14.6MPa.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
Claims (10)
1. The utility model provides a gather magnetism type road surface material for car dynamic induction charging which characterized in that: the geopolymer slurry comprises a uniformly mixed geopolymer slurry and a magnetizer, the geopolymer slurry comprises a uniformly mixed composite alkali activator, water and alkali active powder, the composite alkali activator comprises one or more of supplementary evaporated water, water glass, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate and solid sodium silicate, and the alkali active powder is an alkali active material with silicon-aluminum activity and composed of silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron.
2. The magnetic gathering pavement material for automobile dynamic induction charging according to claim 1, characterized in that: the alkali active powder is composed of silicon-aluminum active fly ash, granulated blast furnace slag, red mud, metakaolin or coconut ash which are composed of silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron.
3. The magnetic concentration type pavement material for dynamic induction charging of automobiles according to claim 2, wherein: the modulus of the water glass is 0.8-4.0, the baume degree of the water glass is 32.0-44.0, the content of sodium oxide in the water glass is more than or equal to 8wt%, and the content of silicon dioxide in the water glass is more than or equal to 25wt%.
4. The magnetic concentration type pavement material for dynamic induction charging of automobiles according to claim 3, wherein: the water-solid ratio of the geopolymer slurry is 0.3 to 0.5.
5. The magnetic concentration type pavement material for dynamic induction charging of automobiles according to claim 2, wherein: siO in alkali active powder2With Al2O3The molar ratio of (B) is 3.0 to 5.6.
6. The magnetic concentration type pavement material for dynamic induction charging of automobiles according to claim 1, wherein: the mass of the magnetizer is 40% -60% of the total mass of the geopolymer slurry and the magnetizer.
7. The magnetic gathering pavement material for automobile dynamic induction charging according to claim 6, wherein: the magnetizer is iron powder with the grain diameter ranging from 15 to 150 micrometers.
8. The magnetic concentration type pavement material for dynamic induction charging of automobiles according to claim 1, wherein: the compound alkali activator comprises water, water glass and sodium hydroxide which are supplemented to be evaporated, the purity of the sodium hydroxide in the compound alkali activator is more than or equal to 96%, and the dosage ratio of the sodium hydroxide to the water glass is as follows: 3.5 to 6.8.
9. The preparation method of the magnetic gathering type pavement material for the dynamic induction charging of the automobile based on any one of claims 1 to 8 is characterized by comprising the following steps of:
step 1, preparing a clear mixed solution: weighing sodium hydroxide and water glass according to the proportion of the using amount
Adding sodium hydroxide into water glass for multiple times, and continuously stirring until the sodium hydroxide is completely dissolved to obtain a clear mixed solution with the modulus of 0.8 to 3.2 and the concentration of more than or equal to 40 wt%;
step 2, preparing a compound alkali activator: standing the clear mixed solution, cooling to room temperature, supplementing evaporated water, namely adding the supplemented evaporated water until the total mass of the clear mixed solution is equal to the total mass of the weighed sodium hydroxide and the weighed water glass, and uniformly stirring to obtain the required compound alkali activator;
step 3, preparing geopolymer slurry: activating the composite alkali activator with alkaliMixing the powder materials, adding water, and stirring uniformly to obtain geopolymer slurry; the water-solid ratio of the geopolymer slurry is 0.3 to 0.5 by weight; and SiO in the components contained in the geopolymer slurry2With Al2O3The molar ratio of (A) to (B) is 3.0 to 5.6;
step 4, magnetization treatment: and (4) weighing a magnetizer, adding the magnetizer into the geopolymer slurry prepared in the step (3), and stirring until the magnetizer and the geopolymer slurry are uniformly mixed to prepare a semi-finished product of the magnetic-gathering type pavement material, wherein the doping amount of the magnetizer accounts for 40-60% of the total mass of the polymer slurry and the magnetizer.
10. The preparation method of the magnetic concentration type pavement material for the dynamic induction charging of the automobile according to claim 9, wherein the preparation method comprises the following steps: further comprises the following steps of 5, maintenance: pouring the semi-finished product of the magnetism-gathering pavement material into a mold, placing the mold into a standard curing box with the temperature of 25 ℃ and the humidity of 95 percent for curing for 28 days, and removing the mold to obtain the finished product of the magnetism-gathering pavement material.
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| CN115636631A (en) * | 2022-11-09 | 2023-01-24 | 山东高速集团有限公司创新研究院 | Geopolymer-based soft magnetic material, preparation method thereof and application thereof in detection of crack width of asphalt pavement base course |
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| CN115636631A (en) * | 2022-11-09 | 2023-01-24 | 山东高速集团有限公司创新研究院 | Geopolymer-based soft magnetic material, preparation method thereof and application thereof in detection of crack width of asphalt pavement base course |
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