CN111943572A - Preparation method of rubber modified asphalt mixture - Google Patents
Preparation method of rubber modified asphalt mixture Download PDFInfo
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- CN111943572A CN111943572A CN202010828183.1A CN202010828183A CN111943572A CN 111943572 A CN111943572 A CN 111943572A CN 202010828183 A CN202010828183 A CN 202010828183A CN 111943572 A CN111943572 A CN 111943572A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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Abstract
The invention relates to the technical field of road engineering, and discloses a preparation method of a rubber modified asphalt mixture, which comprises the following steps: s1, obtaining rubber powder, and adding the rubber powder into the matrix asphalt to form a cementing material; s2, weighing 120 parts of cementing material and 30-40 parts of aggregate according to the parts by weight, and mixing the cementing material and the aggregate; s3, stirring the cementing material and the aggregate in a stirring cylinder for 60-80 seconds; s4, weighing 3-10 parts of mineral powder by weight, and adding the mineral powder into the stirring cylinder; and S5, stirring the mixture of the mineral powder, the cementing material and the aggregate for 35-55 seconds to obtain the rubber modified asphalt mixture. According to the invention, the rubber modifier is mixed in the matrix asphalt, so that waste tires are fully utilized, the solid waste pollution is reduced, and the energy-saving and environment-friendly effects are achieved; the softening point of the matrix asphalt is increased, the ductility is reduced, and the penetration is reduced; the high and low temperature performance is improved; the temperature sensitivity is reduced, the aging performance is enhanced, and the caking property of the modified asphalt material is enhanced.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to a preparation method of a rubber modified asphalt mixture.
Background
With the rapid development of national economy of China, highway traffic is also rapidly developed. The main material for paving the highway in China is common road asphalt, and the asphalt has the defects of low-temperature embrittlement, high-temperature flowing, poor adaptability to strain values, poor fatigue resistance and the like. Because the road is subjected to the action of water and moisture in the air for a long time, the asphalt can be decomposed and lose the binding power to sand and aggregate, so that the service life of the road surface is short.
Meanwhile, with the sudden and violent increase of the number of motor vehicles, more and more waste tires need to be treated urgently, people try to treat the waste tires by using a burying or burning method, but water pollution, air pollution and huge waste of resources are easily caused, so a more reasonable waste tire treatment method needs to be urgently found.
At present, modified asphalt is mostly adopted as a paving material for foreign roads. The modified asphalt has good durability, abrasion resistance, high-temperature non-softening and low-temperature anti-cracking performance, and can prolong the service life of the pavement by times. However, the existing modified asphalt material has weak cohesiveness, cracks are easily generated due to thermal expansion and cold contraction in a large temperature difference environment for a long time, and the modified asphalt material has low stability during preparation, so that hidden troubles are brought to the use of the subsequent modified asphalt material.
Disclosure of Invention
The invention aims to provide a preparation method of a rubber modified asphalt mixture, and aims to solve the problem of weak caking property of a modified asphalt material in the prior art. The invention is realized in such a way, and the preparation method of the rubber modified asphalt mixture according to the embodiment of the invention specifically comprises the following steps:
s1, obtaining rubber powder, and adding the rubber powder into the matrix asphalt to form a cementing material;
s2, weighing 120 parts of cementing material and 30-40 parts of aggregate according to the parts by weight, and mixing the cementing material and the aggregate;
s3, stirring the cementing material and the aggregate in a stirring cylinder for 60-80 seconds;
s4, weighing 3-10 parts of mineral powder by weight, and adding the mineral powder into the stirring cylinder;
and S5, stirring the mixture of the mineral powder, the cementing material and the aggregate for 35-55 seconds to obtain the rubber modified asphalt mixture.
Preferably, in step S1, the mass part ratio of the rubber powder to the asphalt is 0.15 to 0.2: 1.
preferably, the mass part ratio of the rubber powder to the matrix asphalt is 0.18: 1.
preferably, after step S5, the method further includes: and naturally air-drying the rubber modified asphalt mixture.
Preferably, the natural air drying time of the rubber modified asphalt mixture is 1-2 hours.
Preferably, the aggregate is: any one or more of river sand, lake sand, mountain sand or desalinated sea sand.
Preferably, the mixing bowl is provided with a viewing aperture.
Preferably, the particle size of the base asphalt is 30 to 50 mm.
Preferably, the cementing material is thrown into the stirring cylinder through the observation hole.
Preferably, the particle size of the base asphalt is 40 mm.
Compared with the prior art, the preparation method of the rubber modified asphalt mixture has the beneficial effects that:
1. the waste tires are fully utilized, the solid waste pollution is reduced, and the energy is saved and the environment is protected;
2. the softening point of the matrix asphalt is increased, the ductility is reduced, and the penetration is reduced; the high and low temperature performance is improved; the temperature sensitivity is reduced, the aging performance is enhanced, and the caking property of the modified asphalt material is enhanced.
Drawings
FIG. 1 is a flow chart of a method for preparing a rubber modified asphalt mixture according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a method for preparing a rubber modified asphalt mixture according to a second embodiment of the present invention;
FIG. 3 is a flow chart of a method for preparing a rubber modified asphalt mixture according to a third embodiment of the present invention;
FIG. 4 is a flow chart of a method for preparing a rubber modified asphalt mixture according to a fourth embodiment of the present invention;
FIG. 5 is a flow chart of a method for preparing a rubber modified asphalt mixture according to a fifth embodiment of the present invention;
FIG. 6 is a flow chart of a method for preparing a rubber modified asphalt mixture according to a sixth embodiment of the present invention;
FIG. 7 is a schematic diagram of an experiment of a rubber modified asphalt mixture prepared by the method for preparing a rubber modified asphalt mixture according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a mixing tank for mixing rubber-modified asphalt mixtures prepared by the preparation methods of rubber-modified asphalt mixtures provided in examples one to six of the present invention.
In the figure, 1-a stirring cylinder, 2-a cylinder cover, 3-an observation hole, 4-an observation hole cover, 5-a gas inlet and outlet hole, 6-a gas inlet and outlet hole cover, 7-a cylinder cover air pressure lifting adjusting device, 8-a motor, 9-a discharge hole, 10-a receiving hopper, 11-a discharge hole baffle, 12-a stirring shaft, 13-a stirring sheet and 14-a bracket.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Example one
Referring to fig. 1, a flow chart of a preparation method of a rubber modified asphalt mixture according to an embodiment of the present invention is shown. Fig. 7 is a schematic diagram of an experiment of a rubber modified asphalt mixture prepared by the method for preparing a rubber modified asphalt mixture according to an embodiment of the present invention. The invention provides a better embodiment, a preparation method of a rubber modified asphalt mixture, which comprises the following steps:
s21, obtaining rubber powder, and adding the rubber powder into the matrix asphalt to form a cementing material;
the processing of the waste tires into rubber powder is a harmless and resourceful treatment method of the waste tires recognized in the world, and the existing production method of the rubber powder mainly comprises a normal-temperature crushing method and a low-temperature crushing method, wherein the low-temperature crushing method comprises a liquid nitrogen freezing method and an air freezing method. In order to improve the performance of the rubber powder, the rubber powder is generally activated into vulcanized rubber powder for use. The rubber powder has very wide application range due to different particle sizes and properties, and the rubber powder is mainly applied to the production of rubber products, modified asphalt and reclaimed rubber. The use of rubber for modifying asphalt is one of the main uses of rubber powder. Experimental research shows that the mass part ratio of the rubber powder to the matrix asphalt is 0.15-0.2: the performance of 1 pair of asphalt is obviously improved. In this example, the mass ratio of the rubber powder to the matrix asphalt is 0.18: 1. At present, the asphalt used in the new road of the building is over 400 ten thousand tons each year in China, for example, the mixing amount of the rubber powder is 18 percent, 72 ten thousand tons of rubber powder is consumed each year, which is equivalent to about 12960 automobile tires each year, and the method is favorable for reducing the solid waste pollution and the sustainable development policy. In order to obtain better performance of the rubber modified asphalt mixture, the particle size of the base asphalt is preferably 30-50 mm, and the base asphalt with the particle size of 40 mm is adopted in the embodiment.
S22, weighing 100 parts of cementing material and 30 parts of aggregate according to the parts by weight, and mixing the cementing material and the aggregate;
aggregates with a particle size of 4.75mm or less are called fine aggregates, commonly called sand. The sand is divided into natural sand and artificial sand according to the production source. The natural sand is rock particles with the particle size of less than 4.75mm formed by natural weathering, water flow transportation and sorting and accumulation, but does not comprise particles of soft rock and weathered rock. Natural sands include river sands, lake sands, mountain sands, and desalinated sea sands. In order to achieve better skeleton and supporting effect in the building, the aggregate of the embodiment is selected from the following materials: any one or more of river sand, lake sand, mountain sand or desalinated sea sand.
S23, stirring the cementing material and the aggregate in a stirring cylinder for 60 seconds;
s24, weighing 3 parts of mineral powder according to parts by weight, and adding the mineral powder into a stirring cylinder;
the mineral powder is prepared by using granulated blast furnace slag as a main raw material, adding a small amount of gypsum, and grinding into powder with certain fineness, and is called granulated blast furnace slag powder, which is called slag powder for short. The mixture is mixed with a proper amount of mineral powder, so that the fluidity of the mixture can be improved, the hydration heat of the mixture can be reduced, the anti-permeability capability of the mixture can be improved, the later strength can be improved, the internal structure of the mixture can be improved, the anti-permeability and anti-corrosion capabilities can be improved, and the cost of the mixture can be reduced.
And S25, stirring the mixture of the mineral powder, the cementing material and the aggregate for 35 seconds to obtain the rubber modified asphalt mixture.
From the perspective of composite materials, the rubber powder is a composite phase material in the rubber modified asphalt, and the matrix asphalt is a matrix material. The addition of the rubber powder changes various properties of the asphalt, mainly comprising:
(1) the addition of the rubber powder greatly improves the viscosity of the asphalt, so that the softening point of the asphalt is increased, the penetration is reduced, and the high-temperature performance of the asphalt is improved;
(2) the rubber powder improves the low-temperature ductility of the asphalt and increases the catalytic temperature of the asphalt;
(3) the adhesion between rubber bitumen and aggregate is better than that of base bitumen:
(4) the rubber asphalt has an aging resistance superior to that of the base asphalt because of the structure of the rubber and the aging resistance contained in the used tires from which the rubber powder is produced.
By implementing the embodiment, the waste tires are fully utilized, the solid waste pollution is reduced, and the energy conservation and environmental protection are realized; secondly, the softening point of the matrix asphalt is increased, the ductility is reduced, and the penetration is reduced; the high and low temperature performance is improved; the temperature sensitivity is reduced, the aging performance is enhanced, and the caking property of the modified asphalt material is enhanced.
Example two
Referring to fig. 2, a flow chart of a preparation method of the rubber modified asphalt mixture according to the second embodiment of the present invention is shown. The invention provides a better embodiment, a preparation method of a rubber modified asphalt mixture, which comprises the following steps:
s31, obtaining rubber powder, and adding the rubber powder into the matrix asphalt to form a cementing material;
the processing of the waste tires into rubber powder is a harmless and resourceful treatment method of the waste tires recognized in the world, and the existing production method of the rubber powder mainly comprises a normal-temperature crushing method and a low-temperature crushing method, wherein the low-temperature crushing method comprises a liquid nitrogen freezing method and an air freezing method. In order to improve the performance of the rubber powder, the rubber powder is generally activated into vulcanized rubber powder for use. The rubber powder has very wide application range due to different particle sizes and properties, and the rubber powder is mainly applied to the production of rubber products, modified asphalt and reclaimed rubber. The use of rubber for modifying asphalt is one of the main uses of rubber powder. Experimental research shows that the mass part ratio of the rubber powder to the matrix asphalt is 0.15-0.2: the performance of 1 pair of asphalt is obviously improved. In this example, the mass ratio of the rubber powder to the matrix asphalt is 0.18: 1. At present, the asphalt used in the new road of the building is over 400 ten thousand tons each year in China, for example, the mixing amount of the rubber powder is 18 percent, 72 ten thousand tons of rubber powder is consumed each year, which is equivalent to about 12960 automobile tires each year, and the method is favorable for reducing the solid waste pollution and the sustainable development policy. In order to obtain better performance of the rubber modified asphalt mixture, the particle size of the base asphalt is preferably 30-50 mm, and the base asphalt with the particle size of 40 mm is adopted in the embodiment.
S32, weighing 120 parts of cementing material and 40 parts of aggregate according to the parts by weight, and mixing the cementing material and the aggregate;
aggregates with a particle size of 4.75mm or less are called fine aggregates, commonly called sand. The sand is divided into natural sand and artificial sand according to the production source. The natural sand is rock particles with the particle size of less than 4.75mm formed by natural weathering, water flow transportation and sorting and accumulation, but does not comprise particles of soft rock and weathered rock. Natural sands include river sands, lake sands, mountain sands, and desalinated sea sands. In order to achieve better skeleton and supporting effect in the building, the aggregate of the embodiment is selected from the following materials: any one or more of river sand, lake sand, mountain sand or desalinated sea sand.
S33, stirring the cementing material and the aggregate in a stirring cylinder for 80 seconds;
s34, weighing 10 parts of mineral powder according to parts by weight, and adding the mineral powder into a stirring cylinder;
the mineral powder is prepared by using granulated blast furnace slag as a main raw material, adding a small amount of gypsum, and grinding into powder with certain fineness, and is called granulated blast furnace slag powder, which is called slag powder for short. The mixture is mixed with a proper amount of mineral powder, so that the fluidity of the mixture can be improved, the hydration heat of the mixture can be reduced, the anti-permeability capability of the mixture can be improved, the later strength can be improved, the internal structure of the mixture can be improved, the anti-permeability and anti-corrosion capabilities can be improved, and the cost of the mixture can be reduced.
And S35, stirring the mixture of the mineral powder, the cementing material and the aggregate for 55 seconds to obtain the rubber modified asphalt mixture.
From the perspective of composite materials, the rubber powder is a composite phase material in the rubber modified asphalt, and the matrix asphalt is a matrix material. The addition of the rubber powder changes various properties of the asphalt, mainly comprising:
(1) the addition of the rubber powder greatly improves the viscosity of the asphalt, so that the softening point of the asphalt is increased, the penetration is reduced, and the high-temperature performance of the asphalt is improved;
(2) the rubber powder improves the low-temperature ductility of the asphalt and increases the catalytic temperature of the asphalt;
(3) the adhesion between rubber bitumen and aggregate is better than that of base bitumen:
(4) the rubber asphalt has an aging resistance superior to that of the base asphalt because of the structure of the rubber and the aging resistance contained in the used tires from which the rubber powder is produced.
By implementing the embodiment, the waste tires are fully utilized, the solid waste pollution is reduced, and the energy conservation and environmental protection are realized; secondly, the softening point of the matrix asphalt is increased, the ductility is reduced, and the penetration is reduced; the high and low temperature performance is improved; the temperature sensitivity is reduced, the aging performance is enhanced, and the caking property of the modified asphalt material is enhanced.
EXAMPLE III
Referring to fig. 3, a flow chart of a preparation method of the rubber modified asphalt mixture provided by the third embodiment of the present invention is shown. The invention provides a better embodiment, a preparation method of a rubber modified asphalt mixture, which comprises the following steps:
s41, obtaining rubber powder, and adding the rubber powder into the matrix asphalt to form a cementing material;
the processing of the waste tires into rubber powder is a harmless and resourceful treatment method of the waste tires recognized in the world, and the existing production method of the rubber powder mainly comprises a normal-temperature crushing method and a low-temperature crushing method, wherein the low-temperature crushing method comprises a liquid nitrogen freezing method and an air freezing method. In order to improve the performance of the rubber powder, the rubber powder is generally activated into vulcanized rubber powder for use. The rubber powder has very wide application range due to different particle sizes and properties, and the rubber powder is mainly applied to the production of rubber products, modified asphalt and reclaimed rubber. The use of rubber for modifying asphalt is one of the main uses of rubber powder. Experimental research shows that the mass part ratio of the rubber powder to the matrix asphalt is 0.15-0.2: the performance of 1 pair of asphalt is obviously improved. In this example, the mass ratio of the rubber powder to the matrix asphalt is 0.18: 1. At present, the asphalt used in the new road of the building is over 400 ten thousand tons each year in China, for example, the mixing amount of the rubber powder is 18 percent, 72 ten thousand tons of rubber powder is consumed each year, which is equivalent to about 12960 automobile tires each year, and the method is favorable for reducing the solid waste pollution and the sustainable development policy. In order to obtain better performance of the rubber modified asphalt mixture, the particle size of the base asphalt is preferably 30-50 mm, and the base asphalt with the particle size of 40 mm is adopted in the embodiment.
S42, weighing 110 parts of cementing material and 35 parts of aggregate according to the parts by weight, and stirring the cementing material and the aggregate;
aggregates with a particle size of 4.75mm or less are called fine aggregates, commonly called sand. The sand is divided into natural sand and artificial sand according to the production source. The natural sand is rock particles with the particle size of less than 4.75mm formed by natural weathering, water flow transportation and sorting and accumulation, but does not comprise particles of soft rock and weathered rock. Natural sands include river sands, lake sands, mountain sands, and desalinated sea sands. In order to achieve better skeleton and supporting effect in the building, the aggregate of the embodiment is selected from the following materials: any one or more of river sand, lake sand, mountain sand or desalinated sea sand.
S43, stirring the cementing material and the aggregate in a stirring cylinder for 70 seconds;
s44, weighing 7 parts of mineral powder according to parts by weight, and adding the mineral powder into a stirring cylinder;
the mineral powder is prepared by using granulated blast furnace slag as a main raw material, adding a small amount of gypsum, and grinding into powder with certain fineness, and is called granulated blast furnace slag powder, which is called slag powder for short. The mixture is mixed with a proper amount of mineral powder, so that the fluidity of the mixture can be improved, the hydration heat of the mixture can be reduced, the anti-permeability capability of the mixture can be improved, the later strength can be improved, the internal structure of the mixture can be improved, the anti-permeability and anti-corrosion capabilities can be improved, and the cost of the mixture can be reduced.
And S45, stirring the mixture of the mineral powder, the cementing material and the aggregate for 45 seconds to obtain the rubber modified asphalt mixture.
From the perspective of composite materials, the rubber powder is a composite phase material in the rubber modified asphalt, and the matrix asphalt is a matrix material. The addition of the rubber powder changes various properties of the asphalt, mainly comprising:
(1) the addition of the rubber powder greatly improves the viscosity of the asphalt, so that the softening point of the asphalt is increased, the penetration is reduced, and the high-temperature performance of the asphalt is improved;
(2) the rubber powder improves the low-temperature ductility of the asphalt and increases the catalytic temperature of the asphalt;
(3) the adhesion between rubber bitumen and aggregate is better than that of base bitumen:
(4) the rubber asphalt has an aging resistance superior to that of the base asphalt because of the structure of the rubber and the aging resistance contained in the used tires from which the rubber powder is produced.
And S46, naturally drying the rubber modified asphalt mixture.
In order to make the performance of the rubber modified asphalt mixture more stable, the natural air drying time of the rubber modified asphalt mixture is 1-2 hours.
From the perspective of composite materials, the rubber powder is a composite phase material in the rubber modified asphalt, and the matrix asphalt is a matrix material. The addition of the rubber powder changes various properties of the asphalt, mainly comprising:
(1) the addition of the rubber powder greatly improves the viscosity of the asphalt, so that the softening point of the asphalt is increased, the penetration is reduced, and the high-temperature performance of the asphalt is improved;
(2) the rubber powder improves the low-temperature ductility of the asphalt and increases the catalytic temperature of the asphalt;
(3) the adhesion between rubber bitumen and aggregate is better than that of base bitumen:
(4) the rubber asphalt has an aging resistance superior to that of the base asphalt because of the structure of the rubber and the aging resistance contained in the used tires from which the rubber powder is produced.
By implementing the embodiment, the waste tires are fully utilized, the solid waste pollution is reduced, and the energy conservation and environmental protection are realized; secondly, the softening point of the matrix asphalt is increased, the ductility is reduced, and the penetration is reduced; the high and low temperature performance is improved; the temperature sensitivity is reduced, the aging performance is enhanced, and the caking property of the modified asphalt material is enhanced.
Example four
Referring to fig. 4, a flow chart of a preparation method of the rubber modified asphalt mixture according to the fourth embodiment of the present invention is shown. The preparation method of the rubber modified asphalt mixture provided by the embodiment comprises the following steps:
s51, obtaining rubber powder, and adding the rubber powder into the matrix asphalt to form a cementing material;
the processing of the waste tires into rubber powder is a harmless and resourceful treatment method of the waste tires recognized in the world, and the existing production method of the rubber powder mainly comprises a normal-temperature crushing method and a low-temperature crushing method, wherein the low-temperature crushing method comprises a liquid nitrogen freezing method and an air freezing method. In order to improve the performance of the rubber powder, the rubber powder is generally activated into vulcanized rubber powder for use. The rubber powder has very wide application range due to different particle sizes and properties, and the rubber powder is mainly applied to the production of rubber products, modified asphalt and reclaimed rubber. The use of rubber for modifying asphalt is one of the main uses of rubber powder. Experimental research shows that the mass part ratio of the rubber powder to the matrix asphalt is 0.15-0.2: the performance of 1 pair of asphalt is obviously improved. In this example, the mass ratio of the rubber powder to the matrix asphalt is 0.18: 1. At present, the asphalt used in the new road of the building is over 400 ten thousand tons each year in China, for example, the mixing amount of the rubber powder is 18 percent, 72 ten thousand tons of rubber powder is consumed each year, which is equivalent to about 12960 automobile tires each year, and the method is favorable for reducing the solid waste pollution and the sustainable development policy. In order to obtain better performance of the rubber modified asphalt mixture, the particle size of the base asphalt is preferably 30-50 mm, and the base asphalt with the particle size of 40 mm is adopted in the embodiment.
S52, weighing 100 parts of cementing material and 30 parts of aggregate according to the parts by weight, and mixing the cementing material and the aggregate;
aggregates with a particle size of 4.75mm or less are called fine aggregates, commonly called sand. The sand is divided into natural sand and artificial sand according to the production source. The natural sand is rock particles with the particle size of less than 4.75mm formed by natural weathering, water flow transportation and sorting and accumulation, but does not comprise particles of soft rock and weathered rock. Natural sands include river sands, lake sands, mountain sands, and desalinated sea sands. In order to achieve better skeleton and supporting effect in the building, the aggregate of the embodiment is selected from the following materials: any one or more of river sand, lake sand, mountain sand or desalinated sea sand.
S53, stirring the cementing material and the aggregate in a stirring cylinder for 60 seconds;
s54, weighing 3 parts of mineral powder according to parts by weight, and adding the mineral powder into a stirring cylinder;
the mineral powder is prepared by using granulated blast furnace slag as a main raw material, adding a small amount of gypsum, and grinding into powder with certain fineness, and is called granulated blast furnace slag powder, which is called slag powder for short. The mixture is mixed with a proper amount of mineral powder, so that the fluidity of the mixture can be improved, the hydration heat of the mixture can be reduced, the anti-permeability capability of the mixture can be improved, the later strength can be improved, the internal structure of the mixture can be improved, the anti-permeability and anti-corrosion capabilities can be improved, and the cost of the mixture can be reduced.
And S55, stirring the mixture of the mineral powder, the cementing material and the aggregate for 35 seconds to obtain the rubber modified asphalt mixture.
And S56, naturally drying the rubber modified asphalt mixture.
In order to make the performance of the rubber modified asphalt mixture more stable, the natural air drying time of the rubber modified asphalt mixture is 1-2 hours.
From the perspective of composite materials, the rubber powder is a composite phase material in the rubber modified asphalt, and the matrix asphalt is a matrix material. The addition of the rubber powder changes various properties of the asphalt, mainly comprising:
(1) the addition of the rubber powder greatly improves the viscosity of the asphalt, so that the softening point of the asphalt is increased, the penetration is reduced, and the high-temperature performance of the asphalt is improved;
(2) the rubber powder improves the low-temperature ductility of the asphalt and increases the catalytic temperature of the asphalt;
(3) the adhesion between rubber bitumen and aggregate is better than that of base bitumen:
(4) the rubber asphalt has an aging resistance superior to that of the base asphalt because of the structure of the rubber and the aging resistance contained in the used tires from which the rubber powder is produced.
By implementing the embodiment, the waste tires are fully utilized, the solid waste pollution is reduced, and the energy conservation and environmental protection are realized; secondly, the softening point of the matrix asphalt is increased, the ductility is reduced, and the penetration is reduced; the high and low temperature performance is improved; the temperature sensitivity is reduced, the aging performance is enhanced, and the caking property of the modified asphalt material is enhanced.
EXAMPLE five
Referring to fig. 5, a flow chart of a preparation method of the rubber modified asphalt mixture provided in the fifth embodiment of the present invention is shown. The invention provides a better embodiment, a preparation method of a rubber modified asphalt mixture, which comprises the following steps:
s61, obtaining rubber powder, and adding the rubber powder into the matrix asphalt to form a cementing material;
the processing of the waste tires into rubber powder is a harmless and resourceful treatment method of the waste tires recognized in the world, and the existing production method of the rubber powder mainly comprises a normal-temperature crushing method and a low-temperature crushing method, wherein the low-temperature crushing method comprises a liquid nitrogen freezing method and an air freezing method. In order to improve the performance of the rubber powder, the rubber powder is generally activated into vulcanized rubber powder for use. The rubber powder has very wide application range due to different particle sizes and properties, and the rubber powder is mainly applied to the production of rubber products, modified asphalt and reclaimed rubber. The use of rubber for modifying asphalt is one of the main uses of rubber powder. Experimental research shows that the mass part ratio of the rubber powder to the matrix asphalt is 0.15-0.2: the performance of 1 pair of asphalt is obviously improved. In this example, the mass ratio of the rubber powder to the matrix asphalt is 0.18: 1. At present, the asphalt used in the new road of the building is over 400 ten thousand tons each year in China, for example, the mixing amount of the rubber powder is 18 percent, 72 ten thousand tons of rubber powder is consumed each year, which is equivalent to about 12960 automobile tires each year, and the method is favorable for reducing the solid waste pollution and the sustainable development policy. In order to obtain better performance of the rubber modified asphalt mixture, the particle size of the base asphalt is preferably 30-50 mm, and the base asphalt with the particle size of 40 mm is adopted in the embodiment.
S62, weighing 120 parts of cementing material and 40 parts of aggregate according to the parts by weight, and mixing the cementing material and the aggregate;
aggregates with a particle size of 4.75mm or less are called fine aggregates, commonly called sand. The sand is divided into natural sand and artificial sand according to the production source. The natural sand is rock particles with the particle size of less than 4.75mm formed by natural weathering, water flow transportation and sorting and accumulation, but does not comprise particles of soft rock and weathered rock. Natural sands include river sands, lake sands, mountain sands, and desalinated sea sands. In order to achieve better skeleton and supporting effect in the building, the aggregate of the embodiment is selected from the following materials: any one or more of river sand, lake sand, mountain sand or desalinated sea sand.
S63, stirring the cementing material and the aggregate in a stirring cylinder for 80 seconds;
s64, weighing 10 parts of mineral powder according to parts by weight, and adding the mineral powder into a stirring cylinder;
the mineral powder is prepared by using granulated blast furnace slag as a main raw material, adding a small amount of gypsum, and grinding into powder with certain fineness, and is called granulated blast furnace slag powder, which is called slag powder for short. The mixture is mixed with a proper amount of mineral powder, so that the fluidity of the mixture can be improved, the hydration heat of the mixture can be reduced, the anti-permeability capability of the mixture can be improved, the later strength can be improved, the internal structure of the mixture can be improved, the anti-permeability and anti-corrosion capabilities can be improved, and the cost of the mixture can be reduced.
And S65, stirring the mixture of the mineral powder, the cementing material and the aggregate for 55 seconds to obtain the rubber modified asphalt mixture.
And S66, naturally drying the rubber modified asphalt mixture.
In order to make the performance of the rubber modified asphalt mixture more stable, the natural air drying time of the rubber modified asphalt mixture is 1-2 hours.
From the perspective of composite materials, the rubber powder is a composite phase material in the rubber modified asphalt, and the matrix asphalt is a matrix material. The addition of the rubber powder changes various properties of the asphalt, mainly comprising:
(1) the addition of the rubber powder greatly improves the viscosity of the asphalt, so that the softening point of the asphalt is increased, the penetration is reduced, and the high-temperature performance of the asphalt is improved;
(2) the rubber powder improves the low-temperature ductility of the asphalt and increases the catalytic temperature of the asphalt;
(3) the adhesion between rubber bitumen and aggregate is better than that of base bitumen:
(4) the rubber asphalt has an aging resistance superior to that of the base asphalt because of the structure of the rubber and the aging resistance contained in the used tires from which the rubber powder is produced.
By implementing the embodiment, the waste tires are fully utilized, the solid waste pollution is reduced, and the energy conservation and environmental protection are realized; secondly, the softening point of the matrix asphalt is increased, the ductility is reduced, and the penetration is reduced; the high and low temperature performance is improved; the temperature sensitivity is reduced, the aging performance is enhanced, and the caking property of the modified asphalt material is enhanced.
EXAMPLE six
Referring to fig. 6, a flow chart of a preparation method of the rubber modified asphalt mixture according to a sixth embodiment of the present invention is shown. The invention provides a better embodiment, a preparation method of a rubber modified asphalt mixture, which comprises the following steps:
s71, obtaining rubber powder, and adding the rubber powder into the matrix asphalt to form a cementing material;
the processing of the waste tires into rubber powder is a harmless and resourceful treatment method of the waste tires recognized in the world, and the existing production method of the rubber powder mainly comprises a normal-temperature crushing method and a low-temperature crushing method, wherein the low-temperature crushing method comprises a liquid nitrogen freezing method and an air freezing method. In order to improve the performance of the rubber powder, the rubber powder is generally activated into vulcanized rubber powder for use. The rubber powder has very wide application range due to different particle sizes and properties, and the rubber powder is mainly applied to the production of rubber products, modified asphalt and reclaimed rubber. The use of rubber for modifying asphalt is one of the main uses of rubber powder. Experimental research shows that the mass part ratio of the rubber powder to the matrix asphalt is 0.15-0.2: the performance of 1 pair of asphalt is obviously improved. In this example, the mass ratio of the rubber powder to the matrix asphalt is 0.18: 1. At present, the asphalt used in the new road of the building is over 400 ten thousand tons each year in China, for example, the mixing amount of the rubber powder is 18 percent, 72 ten thousand tons of rubber powder is consumed each year, which is equivalent to about 12960 automobile tires each year, and the method is favorable for reducing the solid waste pollution and the sustainable development policy. In order to obtain better performance of the rubber modified asphalt mixture, the particle size of the base asphalt is preferably 30-50 mm, and the base asphalt with the particle size of 40 mm is adopted in the embodiment.
S72, weighing 110 parts of cementing material and 35 parts of aggregate according to the parts by weight, and stirring the cementing material and the aggregate;
aggregates with a particle size of 4.75mm or less are called fine aggregates, commonly called sand. The sand is divided into natural sand and artificial sand according to the production source. The natural sand is rock particles with the particle size of less than 4.75mm formed by natural weathering, water flow transportation and sorting and accumulation, but does not comprise particles of soft rock and weathered rock. Natural sands include river sands, lake sands, mountain sands, and desalinated sea sands. In order to achieve better skeleton and supporting effect in the building, the aggregate of the embodiment is selected from the following materials: any one or more of river sand, lake sand, mountain sand or desalinated sea sand.
S73, stirring the cementing material and the aggregate in a stirring cylinder for 70 seconds;
s74, weighing 7 parts of mineral powder according to parts by weight, and adding the mineral powder into a stirring cylinder;
the mineral powder is prepared by using granulated blast furnace slag as a main raw material, adding a small amount of gypsum, and grinding into powder with certain fineness, and is called granulated blast furnace slag powder, which is called slag powder for short. The mixture is mixed with a proper amount of mineral powder, so that the fluidity of the mixture can be improved, the hydration heat of the mixture can be reduced, the anti-permeability capability of the mixture can be improved, the later strength can be improved, the internal structure of the mixture can be improved, the anti-permeability and anti-corrosion capabilities can be improved, and the cost of the mixture can be reduced.
And S75, stirring the mixture of the mineral powder, the cementing material and the aggregate for 45 seconds to obtain the rubber modified asphalt mixture.
And S76, naturally drying the rubber modified asphalt mixture.
In order to make the performance of the rubber modified asphalt mixture more stable, the natural air drying time of the rubber modified asphalt mixture is 1-2 hours.
From the perspective of composite materials, the rubber powder is a composite phase material in the rubber modified asphalt, and the matrix asphalt is a matrix material. The addition of the rubber powder changes various properties of the asphalt, mainly comprising:
(1) the addition of the rubber powder greatly improves the viscosity of the asphalt, so that the softening point of the asphalt is increased, the penetration is reduced, and the high-temperature performance of the asphalt is improved;
(2) the rubber powder improves the low-temperature ductility of the asphalt and increases the catalytic temperature of the asphalt;
(3) the adhesion between rubber bitumen and aggregate is better than that of base bitumen:
(4) the rubber asphalt has an aging resistance superior to that of the base asphalt because of the structure of the rubber and the aging resistance contained in the used tires from which the rubber powder is produced.
EXAMPLE seven
Referring to fig. 8, a schematic structural diagram of a mixing tank for mixing rubber modified asphalt mixtures prepared by the preparation method of rubber modified asphalt mixtures provided in the first to sixth embodiments of the present invention is shown. A mixing bowl for the preparation of rubber modified asphalt mixes comprising: the stirring cylinder 1 is used for placing the rubber modified asphalt mixture; the cylinder cover 2 is used for covering the stirring cylinder 1; the observation hole 3 is arranged on the cylinder cover 2; a manhole cover 4 for covering the manhole 3; the gas inlet and outlet holes 5 are formed in the cylinder cover 2; a gas inlet and outlet cover 6 for covering the gas inlet and outlet 5; the cylinder cover air pressure lifting adjusting device 7 controls the air pressure in the cylinder cover 2 through the air inlet and outlet holes 5; the motor 8 is used for controlling the voltage of the cylinder cover air pressure lifting adjusting device 7; the discharge port 9 is arranged on one side of the stirring cylinder 1 and is used for unloading the rubber modified asphalt mixture after the stirring is finished; the receiving hopper 10 is connected with the discharging port 9 and used for receiving the rubber modified asphalt mixture; a discharge hole is formed between the stirring cylinder 1 and the discharge hole 9, and the discharge hole blocking piece 11 is used for sealing the stirring cylinder 1 during stirring; when discharging, the discharge port baffle plate 11 is pulled upwards, so that the stirring cylinder 1 discharges materials to the discharge port 9 through the discharge hole; the stirring shaft 12 is arranged at the central position of the stirring cylinder 1; the stirring sheet 13 is arranged on the stirring shaft 12; the bracket 14, the stirring cylinder 1 and the motor 8 are arranged on the bracket 14. The observation hole 3 can be used for observing the quantity of the rubber modified asphalt mixture in the stirring cylinder 1, and when a small amount of rubber modified asphalt mixture needs to be continuously added, the rubber modified asphalt mixture can be put in through the observation hole 3. The stirring sheet 13 is a W-shaped sheet body arranged up and down, so that the rubber modified asphalt mixture can be uniformly stirred in different radius ranges.
By implementing the embodiment, the waste tires are fully utilized, the solid waste pollution is reduced, and the energy conservation and environmental protection are realized; secondly, the softening point of the matrix asphalt is increased, the ductility is reduced, and the penetration is reduced; the high and low temperature performance is improved; the temperature sensitivity is reduced, the aging performance is enhanced, and the caking property of the modified asphalt material is enhanced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The preparation method of the rubber modified asphalt mixture is characterized by comprising the following steps:
s1, obtaining rubber powder, and adding the rubber powder into the matrix asphalt to form a cementing material;
s2, weighing 120 parts of cementing material and 30-40 parts of aggregate according to the parts by weight, and mixing the cementing material and the aggregate;
s3, stirring the cementing material and the aggregate in a stirring cylinder for 60-80 seconds;
s4, weighing 3-10 parts of mineral powder by weight, and adding the mineral powder into the stirring cylinder;
and S5, stirring the mixture of the mineral powder, the cementing material and the aggregate for 35-55 seconds to obtain the rubber modified asphalt mixture.
2. The preparation method of the rubber modified asphalt mixture according to claim 1, wherein in the step S1, the mass part ratio of the rubber powder to the matrix asphalt is 0.15-0.2: 1.
3. the preparation method of the rubber modified asphalt mixture according to claim 2, wherein the mass part ratio of the rubber powder to the matrix asphalt is 0.18: 1.
4. the method for preparing a rubber-modified asphalt mixture according to claim 1, further comprising, after step S5: and naturally air-drying the rubber modified asphalt mixture.
5. The method of preparing a rubber-modified asphalt mixture according to claim 4, wherein the time for naturally air-drying the rubber-modified asphalt mixture is 1 to 2 hours.
6. The method of preparing a rubber modified asphalt mixture according to any one of claims 1 to 5, wherein the aggregate is: any one or more of river sand, lake sand, mountain sand or desalinated sea sand.
7. The method for preparing a rubber-modified asphalt mixture according to any one of claims 1 to 5, wherein the stirring cylinder is provided with an observation hole.
8. The method for preparing a rubber-modified asphalt mixture according to any one of claims 1 to 5, wherein the particle size of the base asphalt is 30 to 50 mm.
9. The method according to claim 7, wherein the cement is fed into the mixing bowl through the observation hole.
10. The method of preparing a rubber modified asphalt mixture according to claim 8, wherein the particle size of the base asphalt is 40 mm.
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