CN115304926A - Modified asphalt and asphalt concrete - Google Patents
Modified asphalt and asphalt concrete Download PDFInfo
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- CN115304926A CN115304926A CN202210880575.1A CN202210880575A CN115304926A CN 115304926 A CN115304926 A CN 115304926A CN 202210880575 A CN202210880575 A CN 202210880575A CN 115304926 A CN115304926 A CN 115304926A
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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
- 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
Abstract
The application relates to the field of high molecular compounds, and particularly discloses modified asphalt and asphalt concrete, wherein the modified asphalt comprises the following raw materials in parts by weight: 60-100 parts of matrix asphalt; 2-5 parts of a modifier; 0.2-1 part of stabilizer and 6-8 parts of temperature control agent; the temperature control agent comprises basalt powder, azobenzene, styrene-acrylic emulsion and ethyl ether, wherein the weight ratio of the basalt powder to the azobenzene to the styrene-acrylic emulsion to the ethyl ether is 6: (3-7): 2:1. the asphalt concrete comprises the following raw materials in parts by weight: 100-180 parts of coarse aggregate; 30-40 parts of river sand; 20-40 parts of modified asphalt; 2-10 parts of mineral powder; 3-5 parts of boron nitride fiber. The application has the effect of improving the anti-rutting performance of the asphalt concrete pavement.
Description
Technical Field
The application relates to the field of high molecular compounds, in particular to modified asphalt and asphalt concrete.
Background
Asphalt concrete is commonly called asphalt concrete, and refers to a mixture prepared by mixing mineral aggregate, broken stone or crushed gravel, stone chips or sand, mineral powder and the like with a certain proportion of road asphalt material under strictly controlled conditions. Asphalt concrete is commonly used to pave road surfaces.
In high-temperature weather, the viscosity of heat absorbed by asphalt is reduced, the creep resistance of the asphalt concrete pavement is reduced, vehicles run on the asphalt pavement, and the asphalt material transversely flows due to the stress of the asphalt concrete pavement, so that tracks are formed on the asphalt concrete pavement, the running of the vehicles is influenced, and the service life of the asphalt pavement is reduced.
Disclosure of Invention
In order to improve the anti-rutting performance of an asphalt concrete pavement, the application provides modified asphalt and asphalt concrete.
In a first aspect, the modified asphalt and the asphalt concrete provided by the application adopt the following technical scheme:
the modified asphalt comprises the following raw materials in parts by weight: 60-100 parts of matrix asphalt; 2-5 parts of a modifier; 0.2-1 part of stabilizer and 6-8 parts of temperature control agent; the temperature control agent comprises basalt powder, azobenzene, styrene-acrylic emulsion and ethyl ether, wherein the weight ratio of the basalt powder to the azobenzene to the styrene-acrylic emulsion to the ethyl ether is 6: (3-7): 2:1.
by adopting the technical scheme, the matrix asphalt, the basalt powder, the azobenzene, the styrene-acrylic emulsion and the ethyl ether are used in a matching way, the combination fastness of the azobenzene and the basalt powder is increased by the styrene-acrylic emulsion and the ethyl ether, a porous material azo-loaded structure is formed, when the environmental temperature is increased, the matrix asphalt absorbs heat, the overall temperature of the modified asphalt is increased, the azobenzene absorbs heat through the change of isomer form, and the loss amount of asphalt viscosity is reduced, so that the creep resistance of asphalt concrete is improved, and the asphalt concrete pavement is not easy to form ruts; in rainy days, the temperature in the environment is reduced, the ultraviolet ray is increased, and the azobenzene generates isomer transformation and releases heat under the ultraviolet irradiation condition, so that preparation is made for next heat absorption, and the long-term anti-rutting performance of the asphalt concrete pavement is improved.
Optionally, the modifier comprises an SBS modifier and polyvinyl butyral, and the weight ratio of the SBS modifier to the polyvinyl butyral is (1-7): 2.
by adopting the technical scheme, the SBS modifier improves the high temperature resistance and the fatigue resistance of the matrix asphalt, so that the anti-rutting capability of the asphalt concrete is improved; however, the addition of the SBS modifier easily causes the segregation of the modified asphalt, and the polyvinyl butyral long-chain branch structure increases the viscosity of the modified asphalt, so that the segregation of the modified asphalt is hindered, and the uniformity of the modified asphalt is improved; meanwhile, the polyvinyl butyral improves the water resistance of the matrix asphalt; the SBS modifier is matched with the polyvinyl butyral for use, so that the modified asphalt is not easy to flow transversely in a high-temperature environment, and the anti-rutting performance of the asphalt concrete is improved.
Optionally, the stabilizer is a hindered amine light stabilizer.
By adopting the technical scheme, under the action of ultraviolet rays, the oxygen-containing polar functional groups in the matrix asphalt are increased, the hindered amine light stabilizer is excited by photo-electrons and oxidized into oxygen-nitrogen free radicals, and the content of oxygen-containing free radicals in the modified asphalt concrete is accumulated, so that the further ultraviolet degradation of the matrix asphalt is inhibited, the light stability of the asphalt concrete is improved, the strength loss of the concrete is slow, and the anti-rutting performance is improved.
Optionally, the modified asphalt further comprises 1-5 parts of a flame retardant.
By adopting the technical scheme, the flame retardant reduces the combustion probability of the modified asphalt and improves the use safety of the asphalt concrete.
Optionally, the flame retardant is decabromodiphenylethane.
By adopting the technical scheme, when the mixture of the decabromodiphenyl ethane and the matrix asphalt is combusted, the decabromodiphenyl ethane is decomposed to generate the covering, and the covering prevents the spread of heat and the dissipation of smoke dust, thereby achieving the flame-retardant effect.
Optionally, the modified asphalt further comprises 0.2-1 part of a curing agent, wherein the curing agent comprises sodium tetraborate and cyanate ester resin, and the weight ratio of the sodium tetraborate to the cyanate ester resin is 1:1.
by adopting the technical scheme, the sodium tetraborate, the cyanate ester resin and the matrix asphalt are matched, and the sodium tetraborate cyanate ester resin reacts with the oil in the matrix asphalt to promote the solidification of the oil, so that the solidification of the matrix asphalt is promoted; when the asphalt is softened by heating, the cyanate resin provides support for the asphalt concrete, so that the creep resistance of the asphalt concrete is improved.
In a second aspect, the present application provides an asphalt concrete, which adopts the following technical scheme:
the asphalt concrete comprises the following raw materials in parts by weight: 100-180 parts of coarse aggregate; 30-40 parts of river sand; 20-40 parts of modified asphalt; 2-10 parts of mineral powder; 3-5 parts of boron nitride fiber.
By adopting the technical scheme, the boron nitride fiber and the modified asphalt are matched for use, so that the bonding strength of the concrete slurry is increased, and the asphalt material is not easy to flow transversely, thereby improving the anti-rutting performance of the concrete.
Optionally, the coarse aggregate includes basalt stone and cordierite.
By adopting the technical scheme, the compressive strength of the concrete is improved by the basalt and the cordierite, and the bearing capacity of the concrete is enhanced, so that rutting is not easily formed; the polyvinyl butyral reacts with aluminum contained in cordierite and oxygen in the air to generate organic-inorganic sol which is uniformly dispersed in concrete slurry, and after the concrete is cured, the organic-inorganic sol forms a net structure and improves the high-temperature oxidation resistance of the concrete, so that the asphalt concrete is not easy to form ruts in high-temperature weather.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the matrix asphalt, the basalt powder, the azobenzene, the styrene-acrylic emulsion and the ether are used in a matching way, the styrene-acrylic emulsion and the ether increase the bonding fastness of the azobenzene and the basalt powder to form a porous material azo-loaded structure, when the environmental temperature rises, the matrix asphalt absorbs heat, the overall temperature of the modified asphalt rises, the azobenzene absorbs heat through the change of isomer form, and the viscosity loss of the asphalt is reduced, so that the creep resistance of the asphalt concrete is improved, and the asphalt concrete pavement is not easy to form ruts; in rainy days, the temperature in the environment is reduced, the ultraviolet ray is increased, and the azobenzene generates isomer transformation and releases heat under the ultraviolet irradiation condition, so that preparation is made for next heat absorption, and the long-term anti-rutting performance of the asphalt concrete pavement is improved;
2. the basalt powder increases the viscosity and the friction coefficient of the modified asphalt, and when the asphalt concrete pavement is stressed, the basalt powder hinders the transverse flow of the softened matrix asphalt, so that tracks are not easy to form on the asphalt concrete pavement;
3. the polypropylene emulsion is used as an adhesive, so that the bonding strength of basalt powder and azobenzene is improved, the bonding strength of modified asphalt and aggregate is improved, in addition, the polypropylene emulsion has excellent water resistance, heat resistance and aging resistance, the stability of asphalt concrete in a high-temperature environment is improved, and when the asphalt concrete pavement is stressed, the matrix asphalt flows transversely, so that rutting is not easily formed on the asphalt concrete pavement;
4. when the asphalt is heated and softened, the cyanate resin provides support for the asphalt concrete, so that the creep resistance of the asphalt concrete is improved;
5. after the modified asphalt is added into the concrete slurry, the concrete slurry is heated, stirred and placed for solidification, at the moment, polyvinyl butyral in the modified asphalt reacts with aluminum contained in cordierite and oxygen in the air to generate organic-inorganic sol which is uniformly dispersed in the concrete slurry, and after the concrete is solidified, the organic-inorganic sol forms a net structure and improves the high-temperature oxidation resistance of the concrete, so that the asphalt concrete is not easy to form ruts in high-temperature weather;
6. the sodium tetraborate and the cyanate ester resin are matched with the matrix asphalt, and the sodium tetraborate and the cyanate ester resin react with the oil in the matrix asphalt to promote the solidification of the oil, so that the solidification of the matrix asphalt is promoted; after the cyanate resin is cured, the cyanate resin is polymerized to generate a reticular high polymer, which hinders the lateral flow of the matrix asphalt, improves the creep resistance of the asphalt concrete, and further improves the rutting resistance of the asphalt concrete pavement.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples.
The following examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer, and the starting materials used in the following examples were obtained from ordinary commercial sources unless otherwise specified. The SBS modifier is provided by Xin chemical industry Co., ltd, huizhou city, and has the model of YH-796; the granularity of the basalt powder is 325 meshes; the fineness of the basalt stone is 9-12 mm, and the mud content is less than 0.1%; the fineness of cordierite is 6-12 mm; the granularity of the river sand is 40-70 meshes; the fineness of the mineral powder is 325 meshes; the boron nitride fiber has an average diameter of 1 μm, a length of 10-20 μm, and a specific surface area of m 2 (ii)/g; the stabilizer is a heat stabilizer and is provided by Shijiazhuang Jun Longgong chemical product marketing limited company, and the model is JL-98.
Preparation example
Preparation example 1
S1, heating 60kg of matrix asphalt to 175 ℃, adding 1.5kg of SBS modifier and 0.5kg of polyvinyl butyral, stirring and mixing for 60min at a shearing rate of 4800r/min, then cooling to 170 ℃, standing for 30min, and cooling to obtain modified matrix asphalt;
s2, uniformly mixing 3kg of basalt powder, 1.5kg of azobenzene, 1kg of styrene-acrylic emulsion and 0.5kg of diethyl ether to serve as a temperature control agent;
and S3, putting 0.2kg of stabilizer and the temperature control agent prepared by the S2 into the modified matrix asphalt, and uniformly mixing to obtain the modified asphalt.
Preparation example 2
S1, heating 80kg of matrix asphalt to 175 ℃, adding 2kg of SBS modifier and 1kg of polyvinyl butyral, stirring and mixing for 60min at a shearing rate of 4800r/min, then cooling to 170 ℃, standing for 30min, and cooling to obtain modified matrix asphalt;
s2, uniformly mixing 3kg of basalt powder, 2.5kg of azobenzene, 1kg of styrene-acrylic emulsion and 0.5kg of diethyl ether to serve as a temperature control agent;
and S3, putting 0.6kg of stabilizer and the temperature control agent prepared in the S2 into the modified matrix asphalt, and uniformly mixing to obtain the modified asphalt.
Preparation example 3
S1, heating 100kg of matrix asphalt to 175 ℃, adding 3.5kg of SBS modifier and 1.5kg of polyvinyl butyral, stirring and mixing for 60min at a shearing rate of 4800r/min, then cooling to 170 ℃, standing for 30min, and cooling to obtain modified matrix asphalt;
s2, uniformly mixing 3kg of basalt powder, 3.5kg of azobenzene, 1kg of styrene-acrylic emulsion and 0.5kg of diethyl ether to serve as a temperature control agent;
and S3, putting 0.2kg of stabilizer and the temperature control agent prepared by the S2 into the modified matrix asphalt, and uniformly mixing to obtain the modified asphalt.
Preparation example 4
The difference between the preparation example and the preparation example 2 is that: 60kg of base asphalt was added.
Preparation example 5
The preparation examples differ from preparation example 2 in that: 100kg of base asphalt was added.
Preparation example 6
The preparation examples differ from preparation example 2 in that: 1.5kg of SBS modifier and 0.5kg of polyvinyl butyral were placed.
Preparation example 7
The preparation examples differ from preparation example 2 in that: 1.5kg of SBS modifier and 1kg of polyvinyl butyral are placed.
Preparation example 8
The difference between the preparation example and the preparation example 2 is that: 1.5kg of SBS modifier and 1.5kg of polyvinyl butyral were placed.
Preparation example 9
The preparation examples differ from preparation example 2 in that: 2kg of SBS modifier and 0.5kg of polyvinyl butyral are placed.
Preparation example 10
The difference between the preparation example and the preparation example 2 is that: 2kg of SBS modifier and 1.5kg of polyvinyl butyral are placed.
Preparation example 11
The difference between the preparation example and the preparation example 2 is that: 3.5kg of SBS modifier and 0.5kg of polyvinyl butyral are placed.
Preparation example 12
The preparation examples differ from preparation example 2 in that: 3.5kg of SBS modifier and 1kg of polyvinyl butyral are introduced.
Preparation example 13
The difference between the preparation example and the preparation example 2 is that: 3kg of SBS modifier and 1.55kg of polyvinyl butyral are placed.
Preparation example 14
The difference between the preparation example and the preparation example 2 is that: 0.2kg of stabilizer was added.
Preparation example 15
The difference between the preparation example and the preparation example 2 is that: 1kg of stabilizer was added.
Preparation example 16
The difference between the preparation example and the preparation example 2 is that: no azobenzene was added.
Preparation example 17
The difference between the preparation example and the preparation example 2 is that: basalt powder is not added.
Preparation example 18
The difference between the preparation example and the preparation example 2 is that: no polypropylene emulsion was added.
Preparation example 19
The difference between the preparation example and the preparation example 2 is that: s2, uniformly mixing 3kg of basalt powder, 1.5kg of azobenzene, 1kg of styrene-acrylic emulsion and 0.5kg of diethyl ether to serve as a temperature control agent.
Preparation example 20
The difference between the preparation example and the preparation example 2 is that: s2, uniformly mixing 3kg of basalt powder, 3.5kg of azobenzene, 1kg of styrene-acrylic emulsion and 0.5kg of diethyl ether to serve as a temperature control agent.
Preparation example 21
The difference between the preparation example and the preparation example 2 is that: and S3, putting 0.6kg of stabilizer, 1kg of decabromodiphenyl ether and the temperature control agent prepared from the S2 into the modified matrix asphalt, and uniformly mixing to obtain the modified asphalt.
Preparation example 22
The difference between the preparation example and the preparation example 2 is that: and S3, putting 0.6kg of stabilizer, 3kg of decabromodiphenyl ether and the temperature control agent prepared from the S2 into the modified matrix asphalt, and uniformly mixing to obtain the modified asphalt.
Preparation example 23
The preparation examples differ from preparation example 2 in that: and S3, adding 0.6kg of stabilizer, 5kg of decabromodiphenyl ether and the temperature control agent prepared from the S2 into the modified matrix asphalt, and uniformly mixing to obtain the modified asphalt.
Preparation example 24
The difference between the preparation example and the preparation example 2 is that: and S3, putting 0.6kg of stabilizer, 3kg of decabromodiphenyl ether, 0.1kg of sodium tetraborate, 0.1kg of cyanate ester resin and the temperature control agent prepared from the S2 into the modified matrix asphalt, and uniformly mixing to obtain the modified asphalt.
Preparation example 25
The difference between the preparation example and the preparation example 2 is that: and S3, putting 0.6kg of stabilizer, 3kg of decabromodiphenyl ether, 0.3kg of sodium tetraborate, 0.3kg of cyanate ester resin and the temperature control agent prepared from the S2 into the modified matrix asphalt, and uniformly mixing to obtain the modified asphalt.
Preparation example 26
The difference between the preparation example and the preparation example 2 is that: and S3, putting 0.6kg of stabilizer, 3kg of decabromodiphenyl ether, 0.5kg of sodium tetraborate, 0.5kg of cyanate ester resin and the temperature control agent prepared from the S2 into the modified matrix asphalt, and uniformly mixing to obtain the modified asphalt.
Preparation example 27
The difference between the preparation example and the preparation example 2 is that: no temperature control agent was added.
The raw material tables of the preparation examples are shown in table 1:
TABLE 1 raw material tables (kg) of preparation examples
Examples
Example 1
S1, putting 90kg of basalt stones, 10kg of cordierite and 30kg of river sand into a stirrer to be uniformly stirred to serve as base materials;
s2, uniformly mixing 20kg of the modified asphalt prepared in the preparation example 1, 2kg of mineral powder and 3kg of boron nitride fibers to serve as a filler;
and S3, putting the filler into a stirrer, and uniformly stirring and mixing the filler and the base material to obtain the modified asphalt concrete.
Example 2
S1, putting 126kg of basalt stones, 14kg of cordierite and 35kg of river sand into a stirrer to be uniformly stirred to serve as base materials;
s2, uniformly mixing 30kg of the modified asphalt prepared in the preparation example 1, 6kg of mineral powder and 4kg of boron nitride fibers to serve as a filler;
and S3, putting the filler into a stirrer, and uniformly stirring and mixing the filler and the base material to obtain the modified asphalt concrete.
Example 3
S1, putting 162kg of basalt stones, 18kg of cordierite and 40kg of river sand into a stirrer to be uniformly stirred to serve as base materials;
s2, uniformly mixing 40kg of the modified asphalt prepared in the preparation example 1, 10kg of mineral powder and 5kg of boron nitride fibers to serve as a filler;
s3, putting the filler into a stirrer, and uniformly stirring and mixing the filler and the base material to obtain the modified asphalt concrete.
Examples 4 to 28
The difference from example 2 is that: the modified asphalts prepared in preparation examples 2 to 26 were used in this order.
Comparative example
This example differs from example 2 in that: the modified asphalt prepared in preparation example 27 was used.
The raw material tables of the examples and comparative examples are shown in table 2:
TABLE 2 raw material tables (kg) of examples and comparative examples
Performance test
Test method
The dynamic stability of the concrete is measured by a T0719-2011 asphalt mixture rut test method in JTGE20-2011-2004 road engineering asphalt and asphalt mixture test specification, wherein the test machine adopts a crank connecting rod drive loading back and forth operation mode, the width of a test piece is 300mm, and the test results are detailed in Table 2.
TABLE 2 test result data table of each example and comparative example
By combining the embodiment 1, the embodiment 2 and the embodiment 3 and combining the table 2, the anti-rutting performance of the asphalt concrete pavement is improved by adjusting the addition amounts of the aggregate, the river sand, the modified asphalt, the mineral powder and the boron nitride fiber.
By combining the embodiments 2, 4 and 5 and table 2, the thermal stability and viscosity of the modified asphalt are improved and the creep resistance of the modified asphalt at high temperature is improved by adjusting the addition amounts of the matrix asphalt, the SBS modifier, the polyvinyl butyral, the stabilizer, the basalt powder, the azobenzene, the styrene-acrylic emulsion, the diethyl ether, the decabromodiphenylethane, the sodium tetraborate and the cyanate ester resin, thereby improving the rutting resistance of the asphalt concrete pavement.
By combining the examples 4, 6 and 7 and combining the table 2, the thermal stability and viscosity of the modified asphalt are improved by adjusting the addition amount of the matrix asphalt, and the creep resistance of the modified asphalt at high temperature is improved, so that the rutting resistance of the asphalt concrete pavement is improved.
By combining the embodiment 4, the embodiment 8 to the embodiment 15 and the table 2, the thermal stability and the viscosity of the modified asphalt are improved by adjusting the addition amounts of the SBS modifier and the polyvinyl butyral, and the creep resistance of the modified asphalt at high temperature is improved, so that the rutting resistance of the asphalt concrete pavement is improved.
When the addition amounts of other materials are not changed, the addition amount of the SBS modifier in the modified asphalt is increased, and the dynamic stability of the concrete is increased firstly and then reduced by combining the examples 4, 7 and 12 and the table 2. The SBS modifier improves the high temperature resistance and the fatigue resistance of the matrix asphalt, so that the modified asphalt is not easy to soften in high-temperature weather, and the anti-rutting capability of the asphalt concrete is improved; however, the addition of the SBS modifier easily causes the segregation of the modified asphalt at the initial storage and paving stages, so that the uniformity of the modified asphalt is reduced, the bonding strength between the modified asphalt and the aggregate is reduced, and the anti-rutting performance of the asphalt concrete pavement is reduced.
When the amount of other substances was changed, the amount of polyvinyl butyral added to the modified asphalt was increased, and the dynamic stability of the concrete was increased and then decreased, as seen in example 4, example 11, and example 12, in combination with table 2. The reason is that the polyvinyl butyral long-chain branch structure increases the viscosity of the polyvinyl butyral long-chain branch structure, so that the segregation of the modified asphalt is prevented, and the uniformity of the modified asphalt is improved; meanwhile, the polyvinyl butyral improves the water resistance of the matrix asphalt; the polyvinyl butyral is matched with the SBS modifier for use, so that the modified asphalt is not easy to flow transversely in a high-temperature environment, and the anti-rutting performance of the asphalt concrete is improved.
By combining the embodiment 4, the embodiment 16 and the embodiment 17 and combining the table 2, the active free radicals are generated under the thermal condition by adjusting the addition amount of the stabilizer and are subjected to cross-linking grafting with the molecular chains of the SBS polymer and the active functional groups of the asphalt, so that the polymer and the asphalt form a stable adhesive structure, thereby improving the stability of the modified asphalt and further improving the anti-rutting performance of the asphalt concrete pavement.
By combining the example 4 and the example 18 and combining the table 2, it can be seen that the dynamic stability of the modified asphalt concrete is effectively improved by adding the azobenzene. When the environmental temperature rises, the matrix asphalt absorbs heat, the whole temperature of the modified asphalt rises, and the azobenzene absorbs heat through the change of isomer form, so that the loss amount of asphalt viscosity is reduced, the creep resistance of asphalt concrete is improved, and tracks are not easily formed on the asphalt concrete pavement; in rainy days, the temperature in the environment is reduced, the ultraviolet rays are increased, and the azobenzene is subjected to isomer transformation and releases heat under the ultraviolet irradiation condition, so that preparation is made for next heat absorption, and the long-term anti-rutting performance of the asphalt concrete pavement is improved.
Combining example 4 and example 19 with table 2, it can be seen that the addition of basalt powder effectively improves the dynamic stability of the modified asphalt concrete. The basalt powder and the azobenzene are combined to form a porous material azo-loaded structure, so that the azobenzene is uniformly distributed in a modified asphalt system, and the long-term anti-rutting performance of the asphalt concrete pavement is improved.
It can be seen from the combination of example 4 and example 20 and table 2 that the addition of the polypropylene emulsion effectively improves the dynamic stability of the modified asphalt concrete. The reason is that the styrene-acrylic emulsion increases the bonding fastness of azobenzene and basalt powder, so that the stability of a porous material loaded azo structure is improved, the bonding strength of modified asphalt and aggregate is improved, in addition, the polypropylene emulsion has excellent water resistance, heat resistance and aging resistance, the stability of asphalt concrete in a high-temperature environment is improved, and when the asphalt concrete pavement is stressed, the matrix asphalt transversely flows, so that tracks are not easily formed on the modified asphalt concrete pavement.
By combining example 4, example 21 and example 22 and table 2, it can be seen that the thermal stability and viscosity of the modified asphalt are improved by adjusting the addition amount of azobenzene, so that the creep resistance of the modified asphalt at high temperature is improved, and the rutting resistance of the asphalt concrete pavement is further improved.
Combining example 4 and example 23 with table 2, it can be seen that the addition of decabromodiphenylethane improves the dynamic stability of the modified asphalt concrete. The decabromodiphenylethane can raise the fire-retarding performance of the modified asphalt, and at the same time, the decabromodiphenylethane can be reacted to produce a layer of covering material to cover the surface of matrix asphalt so as to raise the structural stability of the modified asphalt and raise the anti-rutting performance of modified asphalt concrete.
It can be seen from the combination of example 23, example 24 and example 25 and from Table 2 that the dynamic stability of the modified asphalt concrete does not change much as the amount of decabromodiphenylethane is increased.
It can be seen by combining example 4 and example 26 with table 2 that the addition of sodium tetraborate and cyanate ester resin effectively improves the dynamic stability of the modified asphalt concrete. The reason is that the sodium tetraborate and the cyanate resin are matched with the matrix asphalt, and the sodium tetraborate and the cyanate resin react with the oil in the matrix asphalt to promote the solidification of the oil, so that the solidification of the matrix asphalt is promoted; after the cyanate resin is cured, the cyanate resin is polymerized to generate a reticular high polymer, which hinders the lateral flow of the matrix asphalt, improves the creep resistance of the asphalt concrete, and further improves the rutting resistance of the asphalt concrete pavement.
Combining examples 26, 27 and 28 with table 2, it can be seen that the dynamic stability of the modified asphalt concrete increases first and then decreases as the amount of sodium tetraborate and cyanate ester resin added increases. The reason is that the cyanate ester resin is softened at 50-60 ℃, the consolidation action is reduced, and the dynamic stability of the modified asphalt concrete is reduced along with the continuous increase of the addition amount of the cyanate ester resin.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The modified asphalt is characterized by comprising the following raw materials in parts by weight: 60-100 parts of matrix asphalt; 2-5 parts of a modifier; 0.2-1 part of stabilizer and 6-8 parts of temperature control agent; the temperature control agent comprises basalt powder, azobenzene, styrene-acrylic emulsion and ethyl ether, wherein the weight ratio of the basalt powder to the azobenzene to the styrene-acrylic emulsion to the ethyl ether is 6: (3-7): 2:1.
2. the modified asphalt of claim 1, wherein the modifier comprises SBS modifier and polyvinyl butyral, and the weight ratio of SBS modifier to polyvinyl butyral is (1-7): 2.
3. the modified asphalt of claim 2, wherein the stabilizer is a hindered amine light stabilizer.
4. The modified asphalt of claim 2, wherein the modified asphalt further comprises 1-5 parts of a flame retardant.
5. The modified asphalt of claim 4, wherein the flame retardant is decabromodiphenylethane.
6. The modified asphalt of claim 4, further comprising 0.2-1 part of a curing agent, wherein the curing agent comprises sodium tetraborate and cyanate ester resin, and the weight ratio of the sodium tetraborate to the cyanate ester resin is 1:1.
7. the asphalt concrete is characterized by comprising the following raw materials in parts by weight: 100-180 parts of coarse aggregate; 30-40 parts of river sand; 20 to 40 parts of the modified asphalt of any one of claims 1 to 6; 2-10 parts of mineral powder; 3-5 parts of boron nitride fiber.
8. The asphalt concrete according to claim 7, wherein the coarse aggregate comprises basalt particles and cordierite.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210880575.1A CN115304926A (en) | 2022-07-25 | 2022-07-25 | Modified asphalt and asphalt concrete |
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| CN202210880575.1A CN115304926A (en) | 2022-07-25 | 2022-07-25 | Modified asphalt and asphalt concrete |
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