CN111718590A - Magnetic powder modified asphalt and preparation method thereof - Google Patents
Magnetic powder modified asphalt and preparation method thereof Download PDFInfo
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- CN111718590A CN111718590A CN202010780656.5A CN202010780656A CN111718590A CN 111718590 A CN111718590 A CN 111718590A CN 202010780656 A CN202010780656 A CN 202010780656A CN 111718590 A CN111718590 A CN 111718590A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J195/00—Adhesives based on bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention discloses magnetic powder modified asphalt and a preparation method thereof. The magnetic powder modified asphalt is prepared from magnetic powder, asphalt and a surfactant according to a proportion, and comprises the following components in percentage by mass: 0.05 to 50.00 percent of magnetic powder, 49.00 to 99.95 percent of asphalt and 0.01 to 1.00 percent of surfactant. The magnetic powder modified asphalt is mainly used for a waterproof bonding layer paved on steel bridge deck asphalt, and after the waterproof bonding layer is coated on the surface of a steel bridge deck, the magnetic powder is magnetized through an external magnetic field, so that the magnetic bonding between the magnetic powder and a steel plate and the magnetic hardening rigidity of the waterproof bonding layer magnetorheological elastomer are additionally increased on the basis of the asphalt and powder modified bonding performance, the bonding strength between the waterproof bonding layer and the steel plate can be improved, the rigidity difference is reduced, and the interlayer bonding performance and the deformation following performance of the steel bridge deck asphalt paving layer are enhanced. In addition, the performance characteristics of the magnetic powder modified asphalt are also suitable for the technologies of bridge expansion joint waterproofing, steel bar and steel structure surface corrosion prevention and the like.
Description
Technical Field
The invention relates to magnetic powder modified asphalt prepared from magnetic powder and asphalt and a preparation method thereof, which can be applied to asphalt pavement waterproof bonding layers of steel bridge decks, can also be applied to technologies of bridge expansion joint waterproofing, reinforcement and steel structure surface corrosion prevention and the like, and belongs to the technical field of building materials.
Background
With the rapid development of the traffic industry in China, the construction of large-span bridges is more and more. The orthotropic steel bridge deck plate box girder system has the advantages of light dead weight, strong lateral wind resistance, convenience in transportation and erection, better spatial structure stress performance, shorter construction period and the like, and is widely applied to modern bridge construction, particularly large-span bridge construction. Meanwhile, the pavement of the steel bridge deck is one of key technologies for the construction of the large-span steel box girder bridge, and is always highly concerned and valued by the academic and engineering communities at home and abroad.
The asphalt concrete has the advantages of light weight, strong deformation coordination capability, good bonding performance with the steel bridge deck, convenient maintenance, comfortable driving and the like, and becomes the preferred pavement structure form of the orthotropic steel bridge deck. The steel bridge surface asphalt concrete pavement structure is directly paved on an orthotropic steel bridge deck, and because the orthotropic steel bridge deck has high flexibility, under the combined action of natural factors such as travelling load, temperature change, wind load, earthquake and the like, the stress and deformation of the steel bridge surface asphalt concrete pavement structure are much more complicated than the stress and deformation of the steel bridge surface asphalt concrete pavement structure under the combined action of natural factors such as travelling load, temperature change, wind load, earthquake and the like, and the working environment is more severe, so that the early damage phenomena such as pushing, rutting, delamination, fatigue cracking and the like of an asphalt pavement layer of the steel bridge surface are easily generated. Therefore, the steel bridge deck asphalt pavement technology is still a worldwide technical problem which is not well solved so far, and the key is the problem of inconsistent deformation followability caused by the difference of cohesiveness and rigidity between the steel bridge deck asphalt pavement layer and the steel bridge deck. The waterproof bonding layer is used as a transition layer for paving the steel bridge deck and the asphalt concrete, plays an important role in a steel bridge deck pavement system, and a large number of engineering practices prove that the damage of a plurality of steel bridge deck pavement systems is gradually developed from the damage of the waterproof bonding layer, so that the bonded and durable waterproof bonding layer technology is necessary to be researched.
The asphalt pavement structure of the steel bridge deck generally comprises an anticorrosive layer, a waterproof bonding layer, a buffer layer and an asphalt mixture pavement layer, and is directly paved on the steel bridge deck. The comprehensive design, construction control and performance evaluation of the pavement layer and the waterproof bonding layer are the keys for guaranteeing the durability of the pavement layer and the waterproof bonding layer, the adhesion and the waterproof effect of the waterproof bonding layer are poor, so that the pavement layer and the steel bridge deck are enabled to slide, the pavement layer and the steel bridge deck are damaged under the repeated action of vehicle load and environmental factors, and the steel bridge deck is easy to corrode.
At present, the waterproof bonding layer materials commonly used at home and abroad mainly comprise modified asphalt, acrylic resin, epoxy resin and other bonding agents, and the bonding agents often have the defects of insufficient bonding force or easy aging and brittleness after thermosetting, overhigh manufacturing cost and the like, so that the further research and development of the steel bridge deck asphalt paving waterproof bonding layer materials with excellent bonding property and durability is very necessary. A large number of engineering practices have also shown that the destruction of waterproof bond coats has become one of the main types of diseases in asphalt pavement of steel bridge decks. Therefore, the selection of a waterproof bonding layer material with excellent performance has important significance for preventing the damage of the asphalt pavement layer of the steel bridge deck.
Therefore, aiming at the problems of the caking property and the durability of the asphalt paving waterproof bonding layer of the steel bridge deck, a proper amount of magnetic powder is blended into the traditional modified asphalt waterproof bonding layer material to prepare the magnetic powder modified asphalt waterproof bonding layer material, so that the physical and magnetic bonding effect between the magnetic powder and the steel bridge deck is further increased under the condition of keeping the physicochemical bonding effect between the traditional material and the steel bridge deck, the bonding effect is comprehensively improved, and the durability is enhanced. Meanwhile, the magnetic powder modified asphalt forms the magnetic hardening effect of the magnetorheological elastomer and the powder modification hardening effect of the magnetic powder in the asphalt, so that the rigidity of the waterproof bonding layer can be improved, the rigidity difference between the waterproof bonding layer and the steel bridge deck is reduced, and the deformation following performance between the asphalt pavement layer and the steel bridge deck is enhanced. In addition, because the magnetic powder is easy to magnetize, the application of the novel material can effectively reduce the construction, maintenance, operation and maintenance costs of asphalt pavement of the steel bridge deck under the condition of obtaining stronger bonding and rigidity effects.
Disclosure of Invention
In order to achieve the above purpose, the invention adopts the following technical scheme:
the magnetic powder modified asphalt prepared from the magnetic powder and the asphalt is prepared from the magnetic powder, the asphalt and a surfactant according to a proportion, and the mass fraction of each component is as follows: 0.05 to 50.00 percent of magnetic powder, 49.00 to 99.95 percent of asphalt and 0.01 to 1.00 percent of surfactant.
Furthermore, the magnetic powder is one or more of millimeter-scale, micron-scale or nanometer-scale neodymium iron boron magnetic powder, barium ferrite magnetic powder, strontium ferrite magnetic powder, ferroferric oxide magnetic powder, carbonyl iron powder and alnico magnetic powder, which can be uniformly dispersed in the asphalt, and is magnetic after magnetization and difficult to demagnetize;
further, the asphalt is any one or more of asphalt of common road petroleum asphalt, polymer modified asphalt, natural asphalt modified asphalt and composite modified asphalt;
further, the surfactant is any one or more combined surfactants of a coupling agent, a stearic acid surfactant, a fatty acid surfactant or an emulsion.
The preparation method of the magnetic powder modified asphalt comprises a dry mixing method and a solvent method:
(1) dry mixing process
S1, preparing a surfactant into a solution according to a mass ratio, wherein a solvent can be absolute ethyl alcohol, kerosene, a hydrocarbon solvent, turpentine or an acetone solvent;
s2, putting the magnetic powder into the prepared solution according to the mass ratio, uniformly stirring, and ensuring that the surface of the magnetic powder is fully and uniformly wrapped by the surfactant to form a mixed solution of the magnetic powder and the surfactant solution;
s3, putting the magnetic powder mixed solution into a dryer for drying to constant weight to obtain activated magnetic powder;
s4, heating the asphalt at the temperature of 135-175 ℃ to be in a complete fluid state;
s5, adding activated magnetic powder into the preheated asphalt according to the mass ratio for several times, and stirring for 10-15 min while heating to avoid uneven stirring caused by cooling and condensation of the asphalt;
and S6, under the condition of a set temperature, putting the stirred mixture of the magnetic powder and the asphalt into a high-speed shearing machine of 1000-7000 r/min for continuously shearing at a high speed for 20-120 min, and preparing the uniformly dispersed magnetic powder modified asphalt after shearing.
(2) Solvent process
S1, preparing a surfactant into a solution according to a mass ratio, wherein a solvent can be absolute ethyl alcohol, kerosene, a hydrocarbon solvent, turpentine or an acetone solvent;
s2, putting the magnetic powder into the prepared surfactant solution according to the mass ratio, uniformly stirring, and ensuring that the surface of the magnetic powder is fully and uniformly wrapped by the surfactant to form a mixed solution of the magnetic powder and the surfactant solution;
s3, heating the asphalt at the temperature of 135-175 ℃ to be in a complete fluid state;
s4, slowly pouring the magnetic powder mixed solution into the preheated asphalt according to the mass ratio, and stirring for 10-15 min while heating to avoid uneven stirring caused by cooling and condensation of the asphalt;
s5, placing the asphalt added with the magnetic powder mixed solution into a low-speed shearing machine, and shearing at a low speed of 1000-3000 r/min for 10-60 min at a set temperature until the solvent is completely evaporated;
s6, placing the mixture of the magnetic powder and the asphalt after low-speed shearing into a high-speed shearing machine, and shearing at a high speed of 1000-7000 r/min for 10-60 min at a set temperature, and preparing the magnetic powder modified asphalt after shearing is completed.
Further, the magnetic powder modified asphalt prepared by the method can be magnetized to prepare the magnetized magnetic powder modified asphalt, and the magnetizing mode can be performed by adopting a capacitive pulse magnetizing machine, a non-energy storage pulse magnetizing machine or a constant current magnetizing machine and the like.
Compared with the prior art, the invention has the advantages that:
the invention mixes a proper amount of magnetic powder into the traditional modified asphalt waterproof bonding layer material, and magnetizes the magnetic powder by the external magnetic field of the magnetizer to prepare the magnetic powder modified asphalt waterproof bonding layer material, and the magnetic powder modified asphalt waterproof bonding layer material is applied to asphalt pavement of a steel bridge deck, and has reasonable preparation process, economy and durability. Compared with the traditional steel bridge deck asphalt pavement waterproof bonding layer, the invention further increases the physical and magnetic bonding effect between the magnetic powder and the steel bridge deck under the condition of keeping the physicochemical bonding effect between the traditional material and the steel bridge deck, so as to comprehensively improve the bonding effect and enhance the durability. Meanwhile, the magnetic powder modified asphalt forms the magnetic hardening effect of the magnetorheological elastomer and the powder modification hardening effect of the magnetic powder in the asphalt, so that the rigidity of the waterproof bonding layer can be improved, the rigidity difference between the waterproof bonding layer and the steel bridge deck is reduced, and the deformation following performance between the asphalt pavement layer and the steel bridge deck is enhanced. Because the magnetic powder is easy to magnetize, the application of the novel material can effectively reduce the construction, maintenance, operation and maintenance costs of asphalt pavement of the steel bridge deck under the condition of obtaining stronger bonding and rigidity effects. In addition, according to the performance characteristics of the magnetic powder modified asphalt, the magnetic powder modified asphalt is also suitable for technologies of bridge expansion joint waterproofing, reinforcing steel bar and steel structure surface anticorrosion and the like.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 shows a dry mixing process of magnetic powder modified asphalt and its preparation method.
FIG. 2 is a solvent process of preparing magnetic powder modified asphalt and the method of preparing the same according to the present invention.
Detailed Description
The present invention will be described in detail with reference to examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention.
Fig. 1 shows an embodiment of a magnetic powder modified asphalt and a preparation method thereof, and the magnetic powder modified asphalt of the embodiment is characterized in that: the selected asphalt is SBS modified asphalt, the magnetic powder is neodymium iron boron magnetic powder with the fineness of 100 microns, and the surfactant is Si69 silane coupling agent. The neodymium iron boron magnetic powder with different mixing amounts is added into the SBS modified asphalt and compared with the performance of the SBS modified asphalt.
The magnetic powder modified asphalt prepared from the neodymium iron boron magnetic powder and SBS modified asphalt comprises the following raw materials in percentage by mass: 100.00 percent of SBS modified asphalt; group B (before magnetization): 6.00 percent of neodymium iron boron magnetic powder, 93.88 percent of SBS modified asphalt and 0.12 percent of silane coupling agent; group C (before magnetization): 10.00 percent of neodymium iron boron magnetic powder, 89.80 percent of SBS modified asphalt and 0.20 percent of silane coupling agent.
In order to conveniently control the preparation quality of the asphalt, the preparation method of the B, C groups of neodymium iron boron magnetic powder modified asphalt adopts a dry mixing method, and comprises the following steps:
s1, the dosage of the Si69 silane coupling agent is 2 percent of the dosage of the neodymium iron boron magnetic powder, and the Si69 silane coupling agent is added according to the mass ratio m1(Si69 silane coupling agent): m2(water) m3(ethanol) is fully hydrolyzed for 2 hours at the ratio of 1: 20 to prepare a coupling agent solution;
s2, mixing the neodymium iron boron magnetic powder according to a mass ratio m4M of neodymium-iron-boron magnetic powder1(Si69 silane coupling agent) is put into the prepared silane coupling agent solution at the ratio of 50: 1, and is stirred uniformly, so that the surface of the neodymium iron boron magnetic powder is fully and uniformly wrapped by the coupling agent, and mixed solution of the neodymium iron boron magnetic powder and the coupling agent solution is formed;
s3, putting the mixed liquid of the neodymium iron boron magnetic powder into a dryer to be dried to constant weight, and obtaining activated neodymium iron boron magnetic powder;
s4, putting the SBS modified asphalt in an oven at the temperature of 175 ℃ to heat to be in a complete fluid state;
s5, adding activated neodymium iron boron magnetic powder into the preheated SBS modified asphalt according to the mass ratio for several times, heating and stirring for 10-15 min, and avoiding uneven stirring caused by cooling and condensation of the SBS modified asphalt;
s6, placing the mixture of the well-stirred neodymium iron boron magnetic powder and SBS modified asphalt into a high-speed shearing machine of 3000r/min for continuous high-speed shearing for 45min at the temperature of 165-175 ℃, and preparing the uniformly-dispersed neodymium iron boron magnetic powder modified asphalt after shearing.
The SBS modified asphalt of the group A is used as a blank control group, and the operation of the SBS modified asphalt of the group A is the same as that of the group B, C, and the specific steps are as follows:
s1, putting SBS modified asphalt in a drying oven at the temperature of 175 ℃ to be heated to be in a complete flow state;
s2, heating and stirring the preheated SBS modified asphalt for 10-15 min;
and S3, putting the stirred SBS modified asphalt into a high-speed shearing machine of 3000r/min at the temperature of 165-175 ℃, continuously shearing for 45min at a high speed, and obtaining the control SBS modified asphalt after shearing.
And magnetizing the neodymium iron boron magnetic powder modified asphalt by adopting a high-voltage pulse type magnetizing machine so as to obtain the D groups of magnetized neodymium iron boron magnetic powder modified asphalt B.
The modified asphalt of group A, B, C and group D were subjected to a conventional test (penetration, ductility and softening point test) and a waterproof adhesive layer adhesion test (drawing and shearing tests at 25 ℃ and 60 ℃ C. at a coating weight of 1.0L/m)2) And comparing the influence of the mixed neodymium iron boron magnetic powder on the conventional and adhesive properties of SBS modified asphalt and the influence of magnetization on the properties of the mixed neodymium iron boron magnetic powder modified asphalt. The specific test results are shown in table 1.
Table 1 SBS modified asphalt and neodymium iron boron magnetic powder modified asphalt performance test data.
As can be seen from Table 1, after the neodymium iron boron magnetic powder is doped, the penetration degree and ductility of the SBS modified asphalt are reduced and the softening point is increased along with the increase of the doping amount of the magnetic powder, which shows that after the neodymium iron boron magnetic powder is doped, the deformation resistance and the high temperature performance of the SBS modified asphalt can be improved, but the neodymium iron boron magnetic powder has adverse effects on the low temperature performance, and the powder modification and hardening effects of the magnetic powder in the SBS modified asphalt are reflected. The drawing and shearing strength of the neodymium iron boron magnetic powder modified asphalt before magnetization at two temperatures is improved by 20-50% compared with that of SBS modified asphalt, the improvement effect is obvious, and the bonding property of SBS modified asphalt can be greatly improved by doping magnetic powder; meanwhile, compared with the group B of neodymium iron boron magnetic powder modified asphalt before magnetization, the group D of neodymium iron boron magnetic powder modified asphalt after magnetization has improved high-temperature performance and bonding performance, wherein the softening point is improved by 10%, and the drawing and shearing strength is improved by 25% -80%, which shows that the magnetization has obvious performance improvement effect on the neodymium iron boron magnetic powder modified asphalt, embodies the magnetic bonding and magnetic hardening effects of the magnetic powder, and is suitable for the technical requirements of interlayer bonding performance and deformation following performance of the waterproof bonding layer paved on the steel bridge deck.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations to the technical solution of the present invention using the technical contents disclosed above without departing from the scope of the technical solution of the present invention, such as changing the type of magnetic powder, the blending ratio and manner, and changing the polymer material of the waterproof adhesive layer, which are common variations of the present invention, and not detailed herein. Therefore, any simple modification of the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (6)
1. The magnetic powder modified asphalt is characterized in that: the magnetic powder is prepared from magnetic powder, asphalt and a surfactant according to a proportion, and the mass fraction of each component is as follows: 0.05 to 50.00 percent of magnetic powder, 49.00 to 99.95 percent of asphalt and 0.01 to 1.00 percent of surfactant.
2. The magnetic powder modified asphalt of claim 1, wherein: the magnetic powder is one or more of millimeter-scale, micron-scale or nanometer-scale neodymium iron boron magnetic powder, barium ferrite magnetic powder, strontium ferrite magnetic powder, ferroferric oxide magnetic powder, carbonyl iron powder and alnico magnetic powder, which can be uniformly dispersed in the asphalt, and is magnetic after magnetization and magnetic particles which are not easy to demagnetize.
3. The magnetic powder modified asphalt of claim 1, wherein: the asphalt is any one or more of asphalt of common road petroleum asphalt, polymer modified asphalt, natural asphalt modified asphalt and composite modified asphalt.
4. The magnetic powder modified asphalt of claim 1, wherein: the surfactant is any one or more of coupling agent, stearic acid surfactant, fatty acid surfactant or emulsion.
5. The method for preparing magnetic powder modified asphalt according to claim 1, wherein the method comprises the following steps: the method can be divided into a dry mixing method and a solvent method:
(1) dry mixing process
S1, preparing a surfactant into a solution according to a mass ratio, wherein a solvent can be absolute ethyl alcohol, kerosene, a hydrocarbon solvent, turpentine or an acetone solvent;
s2, putting the magnetic powder into the prepared surfactant solution according to the mass ratio, uniformly stirring, and ensuring that the surface of the magnetic powder is fully and uniformly wrapped by the surfactant to form a mixed solution of the magnetic powder and the surfactant solution;
s3, putting the magnetic powder mixed solution into a dryer for drying to constant weight to obtain activated magnetic powder;
s4, heating the asphalt at the temperature of 135-175 ℃ to be in a complete fluid state;
s5, adding activated magnetic powder into the preheated asphalt according to the mass ratio for several times, and stirring for 10-15 min while heating to avoid uneven stirring caused by cooling and condensation of the asphalt;
and S6, under the condition of a set temperature, putting the stirred mixture of the magnetic powder and the asphalt into a high-speed shearing machine of 1000-7000 r/min for continuously shearing at a high speed for 20-120 min, and preparing the uniformly dispersed magnetic powder modified asphalt after shearing.
(2) Solvent process
S1, preparing a surfactant into a solution according to a mass ratio, wherein a solvent can be absolute ethyl alcohol, kerosene, a hydrocarbon solvent, turpentine or an acetone solvent;
s2, putting the magnetic powder into the prepared surfactant solution according to the mass ratio, uniformly stirring, and ensuring that the surface of the magnetic powder is fully and uniformly wrapped by the surfactant to form a mixed solution of the magnetic powder and the surfactant solution;
s3, heating the asphalt at the temperature of 135-175 ℃ to be in a complete fluid state;
s4, slowly pouring the magnetic powder mixed solution into the preheated asphalt according to the mass ratio, and stirring for 10-15 min while heating to avoid uneven stirring caused by cooling and condensation of the asphalt;
s5, placing the asphalt added with the magnetic powder mixed solution into a low-speed shearing machine, and shearing at a low speed of 1000-3000 r/min for 10-60 min at a set temperature until the solvent is completely evaporated;
s6, placing the mixture of the magnetic powder and the asphalt after low-speed shearing into a high-speed shearing machine, and shearing at a high speed of 1000-7000 r/min for 10-60 min at a set temperature, and preparing the magnetic powder modified asphalt after shearing is completed.
6. The method for preparing magnetic powder modified asphalt according to claim 5, wherein the method comprises the following steps: and magnetizing the magnetic powder modified asphalt to prepare the magnetized magnetic powder modified asphalt, wherein the magnetizing mode can be performed by adopting a capacitive pulse magnetizing machine, a non-energy-storage pulse magnetizing machine or a constant-current magnetizing machine.
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| CN114702834A (en) * | 2022-05-12 | 2022-07-05 | 鄂尔多斯市路泰公路工程有限责任公司 | High-viscosity high-weather-resistance emulsified asphalt and preparation method thereof |
| CN115491176A (en) * | 2022-10-27 | 2022-12-20 | 武汉理工大学 | Induction heating renaturation self-healing asphalt pouring sealant and preparation method thereof |
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| CN113045235A (en) * | 2021-03-22 | 2021-06-29 | 广西交科集团有限公司 | Magnetic powder activation for magnetic asphalt, preparation of magnetic asphalt, pouring of asphalt board and waterproof bonding layer paving method |
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| CN114702834A (en) * | 2022-05-12 | 2022-07-05 | 鄂尔多斯市路泰公路工程有限责任公司 | High-viscosity high-weather-resistance emulsified asphalt and preparation method thereof |
| CN114702834B (en) * | 2022-05-12 | 2023-08-29 | 鄂尔多斯市路泰公路工程有限责任公司 | High-viscosity high-weather-resistance emulsified asphalt and preparation method thereof |
| CN115491176A (en) * | 2022-10-27 | 2022-12-20 | 武汉理工大学 | Induction heating renaturation self-healing asphalt pouring sealant and preparation method thereof |
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