CN113666668A - Recycled asphalt concrete and preparation method thereof - Google Patents
Recycled asphalt concrete and preparation method thereof Download PDFInfo
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- CN113666668A CN113666668A CN202111098881.1A CN202111098881A CN113666668A CN 113666668 A CN113666668 A CN 113666668A CN 202111098881 A CN202111098881 A CN 202111098881A CN 113666668 A CN113666668 A CN 113666668A
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The application relates to the technical field of recycled concrete, and particularly discloses recycled asphalt concrete which comprises the following substances in parts by weight: 3-10 parts of mineral powder, 1-5 parts of fly ash, 35-150 parts of recycled coarse aggregate, 45-150 parts of recycled fine aggregate and 10-30 parts of modified recycled asphalt; the recycled coarse aggregate comprises a recycled coarse aggregate matrix and an aerogel coating film. The preparation method of the recycled asphalt concrete comprises the following preparation steps: s1, pre-mixing; s2, melting asphalt; and S3, mixing and stirring. The application carries out the cladding processing to the regeneration coarse aggregate, has improved regeneration coarse aggregate surface structure through the cladding processing, has improved the mechanical strength and the mechanical properties of regeneration coarse aggregate material to make it add inside back to the regeneration asphalt concrete, can form good load filling effect, further optimize the life of regeneration asphalt concrete material.
Description
Technical Field
The invention belongs to the technical field of recycled concrete, and particularly relates to recycled asphalt concrete and a preparation method thereof.
Background
The aging of the asphalt refers to the changes of physical properties and chemical properties such as ductility reduction, softening point increase, viscosity increase, oxidation and the like of the asphalt under the comprehensive action of external factors such as sunlight, water, air oxidation and the like in the processes of storage, transportation and construction. After pavement paving is completed, the asphalt will slowly age under natural conditions. As the aging of the asphalt is mainly irreversible chemical change, the asphalt is easy to harden and become brittle and lose the due physical characteristics, thereby affecting the road performance, and the pavement diseases are aggravated under the action of water and vehicle load.
The recycled asphalt pavement material refers to asphalt mixture recycled by milling the pavement, and is also an important component part of the recycled asphalt mixture. After the asphalt is aged, the aromatic content is obviously reduced, and the asphaltene content is obviously increased, which shows that the aromatic content is gradually changed into asphaltene along with the aging process of the asphalt. The component blending principle is that the four component proportions of the waste asphalt are restored to the original asphalt level by adjusting the proportions of the four components in the asphalt, so that the pavement performance of the aged asphalt is restored.
However, the inventor believes that in the scheme of recycling the asphalt pavement material, only the asphalt material is treated, but the improvement of the aggregate in the asphalt mixture is neglected, the recycled aggregate has a plurality of cracks in the recycled aggregate due to recycling, and after the recycled aggregate is added into the recycled asphalt concrete material, the service life of the recycled asphalt concrete material is reduced due to the deterioration of the recycled aggregate in the long-term use process.
Disclosure of Invention
In order to overcome the defect that the service life of the existing recycled asphalt concrete material is poor, the invention provides recycled asphalt concrete and a preparation method thereof, and the following technical scheme is adopted:
in a first aspect, the present application provides a recycled asphalt concrete, which adopts the following technical scheme:
the recycled asphalt concrete comprises the following substances in parts by weight:
3-10 parts of mineral powder;
1-5 parts of fly ash;
35-150 parts of recycled coarse aggregate;
45-150 parts of recycled fine aggregate;
10-30 parts of modified recycled asphalt;
the recycled coarse aggregate comprises a recycled coarse aggregate matrix and an aerogel coating film coated on the surface of the recycled coarse aggregate.
By adopting the technical scheme, the recycled coarse aggregate is subjected to coating treatment, the surface structure of the recycled coarse aggregate is improved through the coating treatment, and the mechanical strength and the mechanical property of the recycled coarse aggregate material are improved, so that after the recycled coarse aggregate material is added into recycled asphalt concrete, a good load filling effect can be formed, and the service life of the recycled asphalt concrete material is further optimized.
Simultaneously, what this application adopted is that aerogel coating film carries out the cladding to the regeneration coarse aggregate matrix and handles, and the aerogel membrane is because its structure from height specific surface area can show the bonding strength who improves between bituminous material and the regeneration coarse aggregate, further closely knit regeneration asphalt concrete material's structure to the mechanical properties of regeneration asphalt concrete material has been improved, has improved regeneration asphalt concrete material's life.
Further, the recycled coarse aggregate is prepared by adopting the following scheme:
(1) according to the mass ratio of 1: 3-5: 6-8: stirring and mixing trimethyltrioxasilane, tetraethoxysilane, ethyl titanate and ethyl acetate, and collecting mixed slurry;
(2) mixing the mixed slurry, a trifluoroacetic acid solution and polyvinyl butyral according to a mass ratio of 1: 6: 12-15, uniformly mixing, and collecting to obtain a mixed solution;
(3) spraying the mixed solvent liquid onto the surface of a regenerated coarse aggregate matrix according to the mass ratio of 1:15, controlling the spraying temperature to be-15 to-10 ℃, heating to 55 to 60 ℃, naturally cooling to room temperature under 3 to 5MPa, and standing for 24 to 30 hours to obtain the regenerated coarse aggregate.
By adopting the technical scheme, the aerogel membrane material is coated on the surface of the regenerated coarse aggregate substrate and then is kept stand and cured under a high-pressure state, so that the aerogel membrane material can penetrate into the cracks in the regenerated coarse aggregate to a certain extent, the crack structure in the regenerated coarse aggregate is effectively blocked and supported, the structural strength of the regenerated coarse aggregate is improved, and the mechanical property and the service life of the regenerated asphalt concrete material are fundamentally improved.
Further, the aerogel coating film is a fiber composite type aerogel coating film.
Through adopting above-mentioned technical scheme, this application still adds the fibre in aerogel coating film and supports the modification, strengthens aerogel coating film material's structural strength, has improved the interface bonding performance of aerogel coating film between regeneration coarse aggregate and bituminous mixture to the mechanical properties and the life of recycled asphalt concrete have further been improved.
Furthermore, the fibers adopted in the fiber composite aerogel coating film comprise any one of glass chopped fibers or aramid chopped fibers.
Through adopting above-mentioned technical scheme, because this application further optimizes chopped strand's material, has chooseed aramid fiber chopped strand and glass chopped strand of high-modulus, high performance for use, the chopped strand that this application chooseed for use all has good anti water absorption performance simultaneously, adds it to inside aerogel coating film material, can effectively improve the oxidative aging of aerogel coating film to reduce the mechanical damage of regeneration coarse aggregate, further improved the mechanical properties and the life of regeneration asphalt concrete.
Further, the modified recycled asphalt is a recycled asphalt material prepared by blending and modifying hydrotalcite.
By adopting the technical scheme, the hydrotalcite is adopted to carry out blending modification treatment on the recycled asphalt material, and can be uniformly dispersed in the asphalt under the action of mechanical force due to the unique multilayer structure of the hydrotalcite, and the hydrotalcite serving as a dispersed phase increases the internal friction resistance between asphalt molecules and a modifier, thereby further improving the mechanical property and the service life of the recycled asphalt concrete.
Further, the particle size of the hydrotalcite is 300-500 meshes, and the hydrotalcite comprises any one of magnesium aluminum-based hydrotalcite or calcium aluminum hydrotalcite.
By adopting the technical scheme, the particle size and the type of the hydrotalcite are optimized, and the loading and the uniform filling performance of the hydrotalcite in the recycled asphalt material are improved, so that the mechanical property and the service life of the recycled asphalt concrete are further improved.
Further, the modified recycled asphalt is prepared by adopting the following scheme:
(1) placing the regenerated asphalt material in a container, stirring, heating and melting;
(2) adding hydrotalcite particles into the heated and melted asphalt material, preserving heat, stirring and swelling, and collecting a stirring mixed solution;
(3) and placing the stirred mixed solution in a high-speed shearing machine, shearing, cooling to room temperature, and collecting to obtain the modified regenerated asphalt.
By adopting the technical scheme, the hydrotalcite material is added into the recycled asphalt material in a melting and heating state, and the hydrotalcite material is added into the recycled asphalt material and uniformly dispersed in a recycled asphalt material system through stirring and mixing after being uniform in particle size and has good structural performance, so that the internal friction of asphalt is increased, the internal flow of asphalt is prevented, the internal structural deformation energy of asphalt is reduced, the structural strength and the mechanical performance of the recycled asphalt material are effectively improved, and the mechanical performance and the service life of recycled asphalt concrete are further improved.
In a first aspect, the present application provides a method for preparing recycled asphalt concrete, which adopts the following technical scheme:
a preparation method of recycled asphalt concrete comprises the following preparation steps:
s1, pre-mixing treatment: according to the formula, stirring and mixing the mineral powder, the fly ash, the recycled coarse aggregate and the recycled fine aggregate, and collecting to obtain a premix;
s2, asphalt melting: placing the modified regenerated asphalt in a container, heating and melting, and collecting to obtain molten asphalt;
s3, mixing and stirring: and (3) mixing the molten asphalt and the premix with stirring at a constant temperature, and collecting the mixed and stirred material to obtain the recycled asphalt concrete.
Through adopting above-mentioned technical scheme, this application carries out the initial mixing to the solid material earlier, improves the mixing uniformity between the solid material, blends it with the melting pitch again, improves the dispersion homogeneity performance of solid material in the melting pitch to optimize the structure of regeneration asphalt concrete material, improved the mechanical properties and the life of regeneration asphalt concrete material.
In summary, the present application includes at least one of the following beneficial technical effects:
the application has the advantages that the recycled coarse aggregate is subjected to coating treatment, the surface structure of the recycled coarse aggregate is improved through the coating treatment, and the mechanical strength and the mechanical property of the recycled coarse aggregate material are improved, so that a good load filling effect can be formed after the recycled coarse aggregate material is added into recycled asphalt concrete, and the service life of the recycled asphalt concrete material is further optimized.
Simultaneously, what this application adopted is that aerogel coating film carries out the cladding to the regeneration coarse aggregate matrix and handles, and the aerogel membrane is because its structure from height specific surface area can show the bonding strength who improves between bituminous material and the regeneration coarse aggregate, further closely knit regeneration asphalt concrete material's structure to the mechanical properties of regeneration asphalt concrete material has been improved, has improved regeneration asphalt concrete material's life.
Secondly, after the aerogel membrane material is coated on the surface of the regenerated coarse aggregate substrate, the regenerated coarse aggregate substrate is kept stand and cured under a high-pressure state, so that the aerogel membrane material can penetrate into cracks inside the regenerated coarse aggregate to a certain extent, the crack structure inside the regenerated coarse aggregate is effectively blocked and supported, the structural strength of the regenerated coarse aggregate is improved, the mechanical property of the regenerated asphalt concrete material is fundamentally improved, and the service life of the regenerated asphalt concrete material is prolonged.
Third, this application still adds the fibre in aerogel coating film and supports the modification, strengthens aerogel coating film material's structural strength, has improved the interface bonding performance of aerogel coating film between regeneration coarse aggregate and bituminous mixture to the mechanical properties and the life of recycled asphalt concrete have further been improved.
Fourth, the hydrotalcite material has been added in the recycled asphalt material of this application under the molten heating state, because hydrotalcite material particle diameter is homogeneous and have good performance, add it to the recycled asphalt material after, through stirring the even dispersion in the recycled asphalt material system of mixing, increased the inside frictional force of pitch, prevented the inside flow of pitch, reduced pitch internal structure deformation ability to effectively improve the structural strength and the mechanical properties of recycled asphalt material, further improved the mechanical properties and the life of recycled asphalt concrete.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples.
The starting materials for the preparation examples, examples and comparative examples of the present application are commercially available unless otherwise specified.
Preparation example
Recycled coarse aggregate preparation
Preparation example 1
A recycled coarse aggregate:
(1) stirring and mixing 1kg of trimethyltrioxasilane, 3kg of ethyl orthosilicate, 6kg of ethyl titanate and 10kg of ethyl acetate, and collecting mixed slurry;
(2) uniformly mixing 1kg of mixed slurry, 6kg of trifluoroacetic acid solution and 12 kg of polyvinyl butyral, and collecting to obtain a mixed dissolved solution;
(3) spraying 1kg of mixed solvent liquid on the surface of a 15kg recycled coarse aggregate substrate, controlling the spraying temperature to be-15 ℃, heating to 55 ℃, naturally cooling to room temperature under 3MPa, and standing for 24h to obtain the recycled coarse aggregate 1.
Preparation example 2
A recycled coarse aggregate:
(1) stirring and mixing 1kg of trimethyltrioxasilane, 4kg of ethyl orthosilicate, 7kg of ethyl titanate and 10kg of ethyl acetate, and collecting mixed slurry;
(2) uniformly mixing 1kg of mixed slurry, 6kg of trifluoroacetic acid solution and 13kg of polyvinyl butyral, and collecting to obtain a mixed dissolved solution;
(3) and spraying 1kg of mixed solvent liquid on the surface of a 15kg recycled coarse aggregate substrate, controlling the spraying temperature to be-12 ℃, heating to 58 ℃, naturally cooling to room temperature under 4MPa, and standing for 26h to prepare the recycled coarse aggregate 2.
Preparation example 3
A recycled coarse aggregate:
(1) stirring and mixing 1kg of trimethyltrioxasilane, 5kg of tetraethoxysilane, 8kg of ethyl titanate and 10kg of ethyl acetate, and collecting mixed slurry;
(2) uniformly mixing 1kg of mixed slurry, 6kg of trifluoroacetic acid solution and 15kg of polyvinyl butyral, and collecting to obtain a mixed dissolved solution;
(3) and spraying 1kg of mixed solvent liquid on the surface of a 15kg recycled coarse aggregate substrate, controlling the spraying temperature to be-10 ℃, heating to 60 ℃, naturally cooling to room temperature under 5MPa, and standing for 30h to prepare the recycled coarse aggregate 3.
Preparation example 4
The difference of the recycled coarse aggregate 1 coated with the fiber composite aerogel coating film from the preparation example 1 is that 500g of glass chopped fibers are added into a mixed dissolving solution in the preparation example, and the rest components and preparation steps are the same as those in the preparation example 1.
Preparation example 5
The difference of the recycled coarse aggregate 2 coated with the fiber composite aerogel coating film from the preparation example 1 is that 500g of aramid chopped fiber is added into a mixed dissolving solution in the preparation example, and the rest components and preparation steps are the same as those in the preparation example 1.
Preparation of modified regenerated asphalt
Preparation example 6
A modified recycled asphalt:
(1) placing the recycled asphalt material in a heating container, heating to 170 ℃, stirring and heating, and collecting to obtain a molten recycled asphalt material;
(2) adding 1kg of 300-mesh magnesium-aluminum-based hydrotalcite particles into 20kg of molten regenerated asphalt material, stirring and swelling for 3 hours at a constant temperature, and collecting a stirring mixed solution;
(3) and placing the stirred mixed solution in a high-speed shearing machine, shearing at the rotating speed of 4500r/min for 2 hours, cooling to room temperature, and collecting the modified regenerated asphalt 1.
Preparation example 7
A modified recycled asphalt:
(1) placing the recycled asphalt material in a heating container, heating to 175 ℃, stirring and heating, and collecting to obtain a molten recycled asphalt material;
(2) adding 2kg of 400-mesh magnalium-based hydrotalcite particles into 20kg of molten regenerated asphalt material, stirring and swelling for 4 hours under the condition of heat preservation, and collecting stirring mixed liquor;
(3) and placing the stirred mixed solution in a high-speed shearing machine, shearing at the rotating speed of 4750r/min for 2 hours, cooling to room temperature, and collecting to obtain the modified regenerated asphalt 2.
Preparation example 8
A modified recycled asphalt:
(1) placing the recycled asphalt material in a heating container, heating to 180 ℃, stirring and heating, and collecting to obtain a molten recycled asphalt material;
(2) adding 5kg of 500-mesh magnesium-aluminum-based hydrotalcite particles into 20kg of molten regenerated asphalt material, stirring and swelling for 3-5 h under heat preservation, and collecting a stirring mixed solution;
(3) and placing the stirred mixed solution in a high-speed shearing machine, shearing at the rotating speed of 5000r/min for 2 hours, cooling to room temperature, and collecting the modified regenerated asphalt 3.
Preparation example 9
A modified reclaimed asphalt 4 was prepared by, in contrast to preparation example 6, adding 1kg of 300 mesh calcium-aluminum hydrotalcite particles in this preparation example in place of the magnesium-aluminum based hydrotalcite in preparation example 6, and the remaining components and preparation steps were the same as in preparation example 6.
Examples
Example 1
A recycled asphalt concrete:
s1, pre-mixing treatment: stirring and mixing 3kg of mineral powder, 1kg of fly ash, 35kg of recycled coarse aggregate 1 and 45kg of recycled fine aggregate, and collecting to obtain a premix;
s2, asphalt melting: 10kg of modified recycled asphalt 1 is placed in a container, heated and melted, and collected to obtain molten asphalt;
s3, mixing and stirring: and (3) mixing the molten asphalt and the premix with stirring at a constant temperature, and collecting the mixed and stirred material to obtain the recycled asphalt concrete.
Example 2
A recycled asphalt concrete:
s1, pre-mixing treatment: stirring and mixing 6kg of mineral powder, 3kg of fly ash, 80kg of recycled coarse aggregate 1 and 80kg of recycled fine aggregate, and collecting to obtain a premix;
s2, asphalt melting: placing 20kg of modified recycled asphalt 1 into a container, heating and melting, and collecting molten asphalt;
s3, mixing and stirring: and (3) mixing the molten asphalt and the premix with stirring at a constant temperature, and collecting the mixed and stirred material to obtain the recycled asphalt concrete.
Example 3
A recycled asphalt concrete:
s1, pre-mixing treatment: according to the formula, 10kg of mineral powder, 5kg of fly ash, 150kg of recycled coarse aggregate 1 and 150kg of recycled fine aggregate are stirred and mixed, and a premix is obtained after collection;
s2, asphalt melting: placing 30kg of modified recycled asphalt 1 in a container, heating and melting, and collecting molten asphalt;
s3, mixing and stirring: and (3) mixing the molten asphalt and the premix with stirring at a constant temperature, and collecting the mixed and stirred material to obtain the recycled asphalt concrete.
Example 4
A recycled asphalt concrete, which is different from example 1 in that 35kg of recycled coarse aggregate 2 was used in place of the recycled coarse aggregate 1 of example 1, and the remaining components and preparation steps were the same as those of example 1.
Example 5
A recycled asphalt concrete, which is different from example 1 in that 35kg of recycled coarse aggregate 3 was used in place of the recycled coarse aggregate 1 of example 1, and the remaining components and preparation steps were the same as those of example 1.
Example 6
A recycled asphalt concrete, which is different from the recycled asphalt concrete in example 1 in that recycled coarse aggregate 1 coated with a fiber composite type aerogel coating film is adopted in the embodiment to replace the recycled coarse aggregate 1 in example 1, and the rest of the components and the preparation steps are the same as those in example 1.
Example 7
A recycled asphalt concrete, which is different from the recycled asphalt concrete in example 1 in that recycled coarse aggregate 2 coated with a fiber composite type aerogel coating film is adopted in the embodiment to replace the recycled coarse aggregate 1 in example 1, and the rest of components and preparation steps are the same as those in example 1.
Example 8
A recycled asphalt concrete is different from the recycled asphalt concrete in example 1 in that modified recycled asphalt 4 is adopted in place of the modified recycled asphalt concrete 1 in example 1, and the rest of components and preparation steps are the same as those in example 1.
Performance test
The properties of the recycled asphalt concrete prepared in examples 1 to 8 were respectively tested.
Detection method/test method
The recycled asphalt concrete prepared in examples 1-8 was subjected to a splitting test according to the test procedure of JTJ052-2000 road engineering asphalt and asphalt mixture. The specific test results are shown in table 1 below:
comparative example
Comparative example 1: compared with the example 1, the recycled asphalt concrete adopts recycled coarse aggregate which is not coated with the aerogel coating film to replace the recycled coarse aggregate 1 in the example 1, and the rest components and the preparation steps are the same as those in the example 1.
Comparative example 2: compared with the example 1, the reclaimed asphalt is adopted to replace the modified reclaimed asphalt 1 in the example 1, and the rest components and the preparation steps are the same as those in the example 1.
Comparative example 3: compared with the example 1, the recycled asphalt concrete adopts recycled coarse aggregate coated with a polyvinyl alcohol film to replace the recycled coarse aggregate 1 in the example 1, and the rest components and the preparation steps are the same as those in the example 1.
Performance test
And respectively testing the performances of the recycled asphalt concrete prepared in the comparative examples 1-3.
Detection method/test method
The recycled asphalt concrete prepared in the comparative examples 1 to 3 is subjected to splitting experimental test according to the test procedure of JTJ052-2000 highway engineering asphalt and asphalt mixture.
The specific test results are shown in table 1 below:
TABLE 1 characterization of durability at 15 ℃ for Experimental examples 1-8 and comparative examples 1-3
Examples 1 to 5, examples 6 to 7 and example 8 were set as 4 groups, and performance analysis was performed in combination with comparative examples 1 to 3 and table 1.
(1) Embodiment 1 ~ 5, comparative example 1 and comparative example 3 compare, show that this application technical scheme carries out cladding treatment to the regeneration coarse aggregate, improved the mechanical strength and the mechanical properties of regeneration coarse aggregate material, thereby make it add inside the regeneration asphalt concrete after, can form good load filling effect, simultaneously, what this application adopted is that aerogel coating film carries out cladding treatment to the regeneration coarse aggregate matrix, the aerogel membrane can show the bonding strength who improves between asphalt material and the regeneration coarse aggregate because its structure from high specific surface area, further closely knit regeneration asphalt concrete material's structure, thereby improved regeneration asphalt concrete material's mechanical properties, the life of regeneration asphalt concrete material has been improved.
(2) Comparing embodiment 6 ~ 7 and embodiment 1 ~ 5 can discover, adopted chopped strand to fill aerogel coating film in embodiment 6 ~ 7, the combination table 1 data can see that, add the fibre in the aerogel coating film and support the modification, strengthen the structural strength of aerogel coating film material, improved the interface bonding performance of aerogel coating film between regeneration coarse aggregate and bituminous mixture to the mechanical properties and the life of regeneration asphalt concrete have further been improved.
(3) Comparing the example 8, the example 1 and the example 2, as hydrotalcite is further added to the asphalt material in the examples 8 and 1, and the data in table 1 show that the hydrotalcite material is added to the recycled asphalt material in a molten and heated state, and the hydrotalcite material has uniform particle size and good performance, the hydrotalcite material is added to the recycled asphalt material and uniformly dispersed in a recycled asphalt material system through stirring and mixing, so that the internal friction of the asphalt is increased, the flow inside the asphalt is prevented, and the internal structural deformation energy of the asphalt is reduced, thereby effectively improving the structural strength and the mechanical property of the recycled asphalt material, and further improving the mechanical property and the service life of the recycled asphalt concrete.
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 recycled asphalt concrete is characterized by comprising the following components in parts by weight:
3-10 parts of mineral powder;
1-5 parts of fly ash;
35-150 parts of recycled coarse aggregate;
45-150 parts of recycled fine aggregate;
10-30 parts of modified recycled asphalt;
the recycled coarse aggregate comprises a recycled coarse aggregate matrix and an aerogel coating film coated on the surface of the recycled coarse aggregate.
2. The recycled asphalt concrete according to claim 1, wherein the recycled coarse aggregate is prepared by adopting the following scheme:
(1) according to the mass ratio of 1: 3-5: 6-8: stirring and mixing trimethyltrioxasilane, tetraethoxysilane, ethyl titanate and ethyl acetate, and collecting mixed slurry;
(2) mixing the mixed slurry, a trifluoroacetic acid solution and polyvinyl butyral according to a mass ratio of 1: 6: 12-15, uniformly mixing, and collecting to obtain a mixed solution;
(3) spraying the mixed solvent liquid onto the surface of a regenerated coarse aggregate matrix according to the mass ratio of 1:15, controlling the spraying temperature to be-15 to-10 ℃, heating to 55 to 60 ℃, naturally cooling to room temperature under 3 to 5MPa, and standing for 24 to 30 hours to obtain the regenerated coarse aggregate.
3. The recycled asphalt concrete according to claim 1, wherein the aerogel coating film is a fiber composite aerogel coating film.
4. The recycled asphalt concrete according to claim 3, wherein the fibers used in the fiber composite aerogel coating film comprise any one of glass chopped fibers or aramid chopped fibers.
5. The recycled asphalt concrete according to claim 1, wherein the modified recycled asphalt is a recycled asphalt material prepared by blending and modifying hydrotalcite.
6. The recycled asphalt concrete according to claim 5, wherein the particle size of the hydrotalcite is 300-500 meshes, and the hydrotalcite comprises any one of magnesium aluminum based hydrotalcite or calcium aluminum hydrotalcite.
7. The recycled asphalt concrete according to claim 5, wherein the modified recycled asphalt is prepared by adopting the following scheme:
(1) placing the regenerated asphalt material in a container, stirring, heating and melting;
(2) adding hydrotalcite particles into the heated and melted asphalt material, preserving heat, stirring and swelling, and collecting a stirring mixed solution;
(3) and placing the stirred mixed solution in a high-speed shearing machine, shearing, cooling to room temperature, and collecting to obtain the modified regenerated asphalt.
8. The method for preparing recycled asphalt concrete according to any one of claims 1 to 7, comprising the following preparation steps:
s1, pre-mixing treatment: according to the formula, stirring and mixing the mineral powder, the fly ash, the recycled coarse aggregate and the recycled fine aggregate, and collecting to obtain a premix;
s2, asphalt melting: placing the modified regenerated asphalt in a container, heating and melting, and collecting to obtain molten asphalt;
s3, mixing and stirring: and (3) mixing the molten asphalt and the premix with stirring at a constant temperature, and collecting the mixed and stirred material to obtain the recycled asphalt concrete.
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| CN202111098881.1A CN113666668A (en) | 2021-09-18 | 2021-09-18 | Recycled asphalt concrete and preparation method thereof |
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