CN111471309A - Asphalt modifier and preparation method thereof, modified asphalt and preparation method thereof - Google Patents
Asphalt modifier and preparation method thereof, modified asphalt and preparation method thereof Download PDFInfo
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- CN111471309A CN111471309A CN202010346448.4A CN202010346448A CN111471309A CN 111471309 A CN111471309 A CN 111471309A CN 202010346448 A CN202010346448 A CN 202010346448A CN 111471309 A CN111471309 A CN 111471309A
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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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L21/00—Compositions of unspecified rubbers
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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
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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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
- C08L2555/00—Characteristics of bituminous mixtures
- C08L2555/20—Mixtures of bitumen and aggregate defined by their production temperatures, e.g. production of asphalt for road or pavement applications
- C08L2555/24—Asphalt produced between 100°C and 140°C, e.g. warm mix asphalt
Abstract
The invention relates to the technical field of modified asphalt, and provides an asphalt modifier and a preparation method thereof, and modified asphalt and a preparation method thereof. The asphalt modifier comprises the following components in parts by weight: 30-45 parts of activated rubber powder; 25-40 parts of PE powder; 5-15 parts of SBS powder; 5-15 parts of a warm mixing agent; 5-10 parts of an anti-aging agent. The preparation method of the asphalt modifier comprises the following steps: mixing activated rubber powder, PE powder, SBS powder, warm mixing agent and anti-aging agent in proportion; adding the mixture into a double-roller plastic refining machine for plastic refining; after plastic refining is finished, slicing, cooling, crushing and grinding into fine powder; filtering the fine powder by a screen to prepare the asphalt modifier. The embodiment of the invention effectively reduces energy consumption and pollutant emission.
Description
Technical Field
The invention relates to the technical field of modified asphalt, in particular to an asphalt modifier and a preparation method thereof, and modified asphalt and a preparation method thereof.
Background
China is a large plastic consumption country, and plastic products bring a series of environmental problems such as white pollution and the like while benefiting mankind, thereby forming serious threats to the living environment of people; the tire belongs to a rubber product, the natural degradation process of rubber is very slow, the number of waste tires is increased along with the increase of the using amount of automobiles, and the waste tires become a rapidly-spreading black public hazard because the tires are black. The black pollution of the white pollution box is difficult to naturally degrade, which brings little pressure to the environment, and the recycling of the waste plastics and the waste rubber also becomes a key research problem for the scholars.
The concept of recycling waste plastics and rubber is not only worrisome but also the requirement of resource recycling, environmental protection and sustainable development, and meanwhile, the healthy and continuous development of the plastic industry and the rubber industry really needs a new recycling method for the waste plastics and the rubber, and the huge economic benefits of the waste plastics and the rubber have attracted the attention of many enterprises.
The SBS modified asphalt is a mainstream modified asphalt road construction material in the current market, but the production of SBS needs to consume a large amount of petroleum resources from both raw materials and energy consumption.
In the production of modified asphalt mixture, the modification process scheme has two types: one is the traditional premixing type finished product modified asphalt scheme (also called premixing type), namely, the finished product modified asphalt is produced firstly and then added into aggregate for mixing; the other scheme is a direct-feeding modified asphalt mixture scheme (also called direct-feeding), which is to directly feed an asphalt modifier into hot aggregate according to an in-situ dispersion theory to mix for a plurality of seconds, and then spray the asphalt modifier into matrix asphalt to mix to form a mixture.
At present, the waste rubber is mainly utilized by crushing the waste rubber and then modifying the crushed waste rubber to obtain the waste rubber powder, the waste rubber powder has more application fields, the rubber powder road technology is basically finished product modification, however, the existing rubber powder modification process has high temperature, limited addition amount, easy segregation and higher requirements on the technology and equipment in the use process.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an asphalt modifier to reduce energy consumption and pollutant discharge.
The invention also provides a preparation method of the asphalt modifier.
The invention also provides modified asphalt.
The invention also provides a preparation method of the modified asphalt.
According to the embodiment of the first aspect of the invention, the asphalt modifier consists of the following components in parts by weight:
30-45 parts of activated rubber powder; 25-40 parts of PE powder; 5-15 parts of SBS powder; 5-15 parts of a warm mixing agent; 5-10 parts of an anti-aging agent.
According to one embodiment of the invention, the warm-mix agent is a synthetic wax type warm-mix agent.
According to one embodiment of the invention, the synthetic wax warm-mix agent comprises a Sasobit warm-mix agent or a Sasobrom warm-mix agent.
According to one embodiment of the present invention, the aging inhibitor is an ultraviolet absorption aging inhibitor.
According to one embodiment of the invention, the particle size of the activated rubber powder is 40-200 meshes, and the particle size of the PE powder is 80-200 meshes.
According to an embodiment of the second aspect of the present invention, a method for preparing the asphalt modifier comprises the following steps:
mixing activated rubber powder, PE powder, SBS powder, warm mixing agent and anti-aging agent in proportion;
adding the mixture into a double-roller plastic refining machine for plastic refining;
after plastic refining is finished, slicing, cooling, crushing and grinding into fine powder;
filtering the fine powder by a screen to prepare the asphalt modifier.
According to an embodiment of the invention, the temperature of a front roller of the two-roller plastic refining machine is 115-130 ℃, the temperature of a rear roller of the two-roller plastic refining machine is 105-125 ℃, the thickness of a thin pass is 0.4-0.7 mm, the number of thin passes is 2-10, the plasticizing time is 4-8 min, and the plastic refining time is 13-20 min.
According to one embodiment of the invention, the screen mesh has a mesh size of 150 mesh.
A modified asphalt according to an embodiment of the third aspect of the present invention includes the asphalt modifier as described above.
According to a third aspect of the present invention, a method for preparing modified asphalt as described above comprises the following steps:
placing 150 ℃ asphalt on a shearing machine, heating and shearing at the same time, wherein the shearing rate is 3000 r/min;
heating asphalt to 160 ℃, adding an asphalt modifier with the particle size of 100-300 meshes, after the asphalt modifier is dissolved, adjusting the shearing rate of a shearing machine to 5000r/min, and shearing for 60 min;
wherein the weight ratio of the asphalt to the asphalt modifier is 80-92: 8-20.
According to the asphalt modifier provided by the embodiment of the invention, the composite functional asphalt modifier is obtained by compounding the activated rubber powder, the PE powder, the SBS powder, the warm-mixing agent and the anti-aging agent; the warm mixing agent can help to reduce the mixing temperature and the rolling temperature of the mixture in the process of modifying the asphalt, reduce the consumption of the asphalt mixture for mixing and heating fuel, reduce the emission of exhaust gas and smoke dust of the asphalt mixture, protect the workers on the construction site, create a better construction operation environment and solve the problem of high mixing temperature of the high-modulus asphalt in producing the mixture; the addition of the activated rubber powder solves the problem of insufficient low-temperature performance in the process of pursuing high-modulus asphalt mixture, and improves the low-temperature deformation crack resistance of the asphalt mixture.
The preparation method of the asphalt modifier provided by the embodiment of the invention has the advantages of simple process and convenience in operation, and is suitable for industrial production.
The modified asphalt provided by the embodiment of the invention can solve the problem of insufficient low-temperature performance of the high-modulus modified asphalt mixture, improves the low-temperature deformation crack resistance of the high-modulus asphalt mixture, and is beneficial to reducing the mixing temperature and the rolling temperature of the high-modulus modified asphalt mixture and reducing the energy consumption.
The preparation method of the modified asphalt provided by the embodiment of the invention is a direct-vat type, can save the production link of the finished modified asphalt, reduce the energy consumption and pollutant discharge in the production process, and reduce the energy consumption of transporting the matrix asphalt to a modified asphalt plant; the transportation link of the finished modified asphalt is saved, the problems of modifier segregation and performance index attenuation in the storage and transportation processes of the modified asphalt are avoided, and the road performance is improved; meanwhile, the direct casting type is convenient for construction organization, the storage time of the modifier is long, the use is flexible and convenient, and the production can be arranged at any time according to the actual situation on the construction site.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for preparing an asphalt modifier according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The embodiment of the invention provides an asphalt modifier, which consists of the following components in parts by weight:
30-45 parts of activated rubber powder; 25-40 parts of PE powder; 5-15 parts of SBS powder; 5-15 parts of a warm mixing agent; 5-10 parts of an anti-aging agent.
It should be noted that the SBS asphalt modified powder in the examples of the present invention is SBS asphalt modified powder, and the types of the SBS asphalt modified powder commonly used include 791H, C501H, 6302, 4303, 3501, C419, 1306, and the like. The SBS powder used in the embodiment of the invention is 791H.
SBS belongs to styrene thermoplastic elastomer, which is styrene-butadiene-styrene triblock copolymer, wherein a polystyrene chain segment and a polybutadiene chain segment in SBS obviously present a two-phase structure, polybutadiene is a continuous phase, polystyrene is a dispersed phase, so that polystyrene has 2 glass transition temperatures, the first glass transition temperature (Tg1) is-88 to-83 ℃, the second glass transition temperature (Tg2) is 90 ℃, terminal polystyrene is gathered together between Tg1 and Tg2 to form micro-domains dispersed among the polybutadiene continuous phases, thus playing the roles of physical crosslinking, chain segment fixing, vulcanization reinforcement and cold flow prevention, having the high elasticity and fatigue resistance of vulcanized rubber, and when the temperature is raised to Tg2, the polystyrene phase is softened and flows to enable SBS to have resin flow processability. The two-phase separation structure can form a spatial three-dimensional network structure with the asphalt matrix, so that the temperature performance, the tensile property, the elasticity, the cohesion adhesion performance, the stability of the mixture, the aging resistance and the like of the asphalt are effectively improved. Among a plurality of asphalt modifiers, SBS can simultaneously improve the high-low temperature performance and the temperature sensing performance of asphalt, so that the asphalt becomes the most researched and applied variety, and SBS modified asphalt accounts for more than 61% of global asphalt demand at present.
In one embodiment of the invention, the warm-mixing agent is a synthetic wax warm-mixing agent.
In one embodiment of the invention, the synthetic wax warm-mix comprises a Sasobit warm-mix or a Sasobrom warm-mix.
In one embodiment of the present invention, the aging inhibitor is an ultraviolet absorption aging inhibitor.
In one embodiment of the invention, the particle size of the activated rubber powder is 40-200 meshes, and the particle size of the PE powder is 80-200 meshes.
According to the asphalt modifier provided by the embodiment of the invention, the composite functional asphalt modifier is obtained by compounding the activated rubber powder, the PE powder, the SBS powder, the warm-mixing agent and the anti-aging agent; the warm mixing agent can help to reduce the mixing temperature and the rolling temperature of the mixture in the process of modifying the asphalt, reduce the consumption of the asphalt mixture for mixing and heating fuel, reduce the emission of exhaust gas and smoke dust of the asphalt mixture, protect the workers on the construction site, create a better construction operation environment and solve the problem of high mixing temperature of the high-modulus asphalt in producing the mixture; the addition of the activated rubber powder solves the problem of insufficient low-temperature performance in the process of pursuing high-modulus asphalt mixture, and improves the low-temperature deformation crack resistance of the asphalt mixture.
Asphalt modifier compositions of examples 1-5
As shown in fig. 1, an embodiment of the present invention further provides a preparation method of the asphalt modifier, including the following steps:
mixing activated rubber powder, PE powder, SBS powder, warm mixing agent and anti-aging agent in proportion;
adding the mixture into a double-roller plastic refining machine for plastic refining;
after plastic refining is finished, slicing, cooling, crushing and grinding into fine powder;
filtering the fine powder by a screen to prepare the asphalt modifier.
In one embodiment of the invention, the temperature of a front roller of the two-roller plastic refining machine is 115-130 ℃, the temperature of a rear roller of the two-roller plastic refining machine is 105-125 ℃, the thickness of the thin pass is 0.4-0.7 mm, the number of thin pass is 2-10, the plasticizing time is 4-8 min, and the plastic refining time is 13-20 min.
In one embodiment of the invention, the screen mesh has a 150 mesh opening.
The preparation method of the asphalt modifier provided by the embodiment of the invention has the advantages of good quality, simple process and convenience in operation, and is suitable for industrial production.
Process parameters for preparation of asphalt modifiers for examples 1-5
The embodiment of the invention also provides modified asphalt, which comprises the asphalt modifier. The modified asphalt provided by the embodiment of the invention can solve the problem of insufficient low-temperature performance of the high-modulus modified asphalt mixture, improves the low-temperature deformation crack resistance of the high-modulus asphalt mixture, and is beneficial to reducing the mixing temperature and the rolling temperature of the high-modulus modified asphalt mixture and reducing the energy consumption.
The embodiment of the invention also provides a preparation method of the modified asphalt, which comprises the following steps:
placing 150 ℃ asphalt on a shearing machine, heating and shearing at the same time, wherein the shearing rate is 3000 r/min;
heating asphalt to 160 ℃, adding an asphalt modifier with the particle size of 100-300 meshes, after the asphalt modifier is dissolved, adjusting the shearing rate of a shearing machine to 5000r/min, and shearing for 60 min;
wherein the weight ratio of the asphalt to the asphalt modifier is 80-92: 8-20.
The preparation method of the modified asphalt provided by the embodiment of the invention is a direct-vat type, can save the production link of the finished modified asphalt, reduce the energy consumption and pollutant discharge in the production process, and reduce the energy consumption of transporting the matrix asphalt to a modified asphalt plant; the transportation link of the finished modified asphalt is saved, the problems of modifier segregation and performance index attenuation in the storage and transportation processes of the modified asphalt are avoided, and the road performance is improved; meanwhile, the direct casting type is convenient for construction organization, the storage time of the modifier is long, the use is flexible and convenient, and the production can be arranged at any time according to the actual situation on the construction site.
Modified asphalt Performance test
The asphalt modifiers of examples 1-5 produced modified asphalt corresponding to examples 6-10; wherein the weight ratio of the asphalt to the asphalt modifier is 88: 12. The modified asphalts of examples 6-10 were tested for their performance as required by road engineering asphalt and asphalt mix test protocol (JTG E20-2011) and compared to asphalts that did not use a direct-vat rubber-plastic composite high modulus warm mix asphalt modifier, the results are shown in the table below.
Results of Property test of modified asphalts of examples 6-10
The asphalt mixture prepared by the direct-throwing rubber-plastic composite high-modulus warm-mix asphalt modifier in the embodiments 6 to 10 adopts the same formula as the direct-throwing rubber-plastic composite high-modulus warm-mix asphalt modifier in the embodiments 1 to 5, and the asphalt modifier is added into mineral aggregate in a direct throwing mode, namely, the asphalt modifier is directly thrown into hot aggregate according to an in-situ dispersion theory and is mixed for a plurality of seconds, and then the hot aggregate is sprayed into matrix asphalt and is mixed to form a mixture. Compared with a premixing process, the direct-throwing process saves the production link of the finished modified asphalt, reduces the energy consumption and pollutant discharge in the production process, and reduces the energy consumption of transporting the matrix asphalt to a modified asphalt plant; the transportation link of the finished product modified asphalt is saved, the problems of modifier segregation and performance index attenuation in the storage and transportation processes of the modified asphalt are avoided, and the road performance is improved. Meanwhile, the direct casting type asphalt modifier is convenient for construction organization, the storage time of the asphalt modifier is long, the asphalt modifier is flexible and convenient to use, and production can be arranged at any time according to actual conditions on a construction site.
Road performance testing
The modified asphalt mixture prepared by the direct-vat rubber-plastic composite high-modulus warm-mix asphalt modifier in the embodiment 1-5 corresponds to the embodiment 6-10; the process is that the direct-throwing rubber-plastic composite high-modulus warm-mixed asphalt modifier is directly thrown into hot mineral aggregate, matrix asphalt is sprayed into the hot mineral aggregate, and the mixture is formed by mixing the hot mineral aggregate and the matrix asphalt, wherein the mineral aggregate in each embodiment is the same common road mineral aggregate, and the mixture is proportioned according to the following gradation design.
AC-13 mineral aggregate grading design table
The modified asphalt mixtures of examples 6-10 were tested for performance as required by the test protocol for road engineering asphalt and asphalt mix (JTG E20-2011), and compared with asphalt mixtures without the direct-vat set rubber-plastic composite high modulus warm mix asphalt modifier, the results are shown in the following table.
Properties of modified asphalt mixtures of examples 6 to 10
From the above table, the modified asphalt mixture using the direct-vat rubber-plastic composite high-modulus warm-mix asphalt modifier provided by the embodiment of the invention has dynamic stability of more than 8500 times/mm, which is much higher than the technical requirement of the current standard on 2800 times/mm (summer heat area) of the modified asphalt mixture. Compared with an unmodified asphalt mixture, the modified asphalt mixture prepared from the direct-vat rubber-plastic composite high-modulus warm-mix asphalt modifier provided by the embodiment of the invention has the technical indexes of improved Marshall stability, water loss resistance, strength ratio of a freeze-thaw splitter and the like; the rutting resistance and the durability of the asphalt mixture are obviously improved; has good road performance.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (10)
1. The asphalt modifier is characterized by comprising the following components in parts by weight:
30-45 parts of activated rubber powder; 25-40 parts of PE powder; 5-15 parts of SBS powder; 5-15 parts of a warm mixing agent; 5-10 parts of an anti-aging agent.
2. The asphalt modifier according to claim 1, wherein the warm-mix agent is a synthetic wax-based warm-mix agent.
3. The asphalt modifier of claim 2, wherein the synthetic wax-based warm-mix agent comprises a Sasobit warm-mix agent or a Sasobrom warm-mix agent.
4. The asphalt modifier according to claim 1, wherein the aging inhibitor is an ultraviolet-absorbing aging inhibitor.
5. The asphalt modifier according to claim 1, wherein the particle size of the activated rubber powder is 40-200 meshes, and the particle size of the PE powder is 80-200 meshes.
6. A process for preparing an asphalt modifier according to any one of claims 1 to 5, comprising the steps of:
mixing activated rubber powder, PE powder, SBS powder, warm mixing agent and anti-aging agent in proportion;
adding the mixture into a double-roller plastic refining machine for plastic refining;
after plastic refining is finished, slicing, cooling, crushing and grinding into fine powder;
filtering the fine powder by a screen to prepare the asphalt modifier.
7. The preparation method of the asphalt modifier according to claim 6, wherein the temperature of a front roller of the two-roller plastic mixing mill is 115-130 ℃, the temperature of a rear roller of the two-roller plastic mixing mill is 105-125 ℃, the thin pass thickness is 0.4-0.7 mm, the thin pass times are 2-10, the plasticizing time is 4-8 min, and the plastic mixing time is 13-20 min.
8. The method of claim 6, wherein the mesh of the screen is 150 mesh.
9. A modified asphalt comprising the asphalt modifier according to any one of claims 1 to 5.
10. A method for preparing the modified asphalt of claim 9, comprising the steps of:
placing 150 ℃ asphalt on a shearing machine, heating and shearing at the same time, wherein the shearing rate is 3000 r/min;
heating asphalt to 160 ℃, adding an asphalt modifier with the particle size of 100-300 meshes, after the asphalt modifier is dissolved, adjusting the shearing rate of a shearing machine to 5000r/min, and shearing for 60 min;
wherein the weight ratio of the asphalt to the asphalt modifier is 80-92: 8-20.
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| CN113029928B (en) * | 2021-04-14 | 2023-01-03 | 广东成信建设工程质量检测有限公司 | Reinforcing bar corrosion detector that bridge road construction was used |
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