CN111960731A - Novel asphalt concrete and preparation process thereof - Google Patents
Novel asphalt concrete and preparation process thereof Download PDFInfo
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- CN111960731A CN111960731A CN202010850447.3A CN202010850447A CN111960731A CN 111960731 A CN111960731 A CN 111960731A CN 202010850447 A CN202010850447 A CN 202010850447A CN 111960731 A CN111960731 A CN 111960731A
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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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- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/10—Clay
- C04B14/104—Bentonite, e.g. montmorillonite
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/32—Carbides; Nitrides; Borides ; Silicides
- C04B14/322—Carbides
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/32—Carbides; Nitrides; Borides ; Silicides
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- C04B14/324—Silicon carbide
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
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- C04B14/4643—Silicates other than zircon
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- 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
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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Abstract
The invention provides a novel asphalt concrete and a preparation process thereof, wherein the asphalt concrete is prepared from the following raw materials in percentage by weight: 2.5-4.5% of limestone mineral powder, 2-3.5% of fly ash, 4-6% of asphalt, 0.8-1.3% of modified basalt chopped fiber, 2.5-6% of bentonite loaded nano SiC-TaC composite material and the balance coarse and fine aggregate. The preparation process comprises the following steps: (1) weighing the raw materials; (2) heating the coarse and fine aggregates to 130-; (3) sequentially adding limestone mineral powder, fly ash, modified basalt chopped fiber and a bentonite loaded nano SiC-TaC composite material into a stirrer, stirring at the temperature of 125-130 ℃ for 10-15min, adding asphalt, stirring, adding coarse and fine aggregates, and stirring to obtain the composite material. The invention has the advantages of low mixing temperature, good dispersibility of various modified substances, strong high-temperature deformation resistance of the prepared asphalt concrete, good aging resistance, high stability and excellent comprehensive performance.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to novel asphalt concrete and a preparation process thereof.
Background
The asphalt concrete is commonly called as asphalt concrete, and is a mixture prepared by manually selecting mineral aggregate with a certain gradation composition, broken stone or crushed gravel, stone chips or sand, mineral powder and the like, and mixing the mineral aggregate, the broken stone or crushed gravel, the stone chips or sand, the mineral powder and a certain proportion of road asphalt material under strictly controlled conditions.
With the rapid development of society and economy, the traffic volume of highways is continuously increased, and asphalt pavements are widely applied to highway construction in nearly 3 years in China in order to improve the road traffic environment and improve the driving comfort. The asphalt pavement not only has smooth surface, comfortable driving, small vibration, low noise, no joint, wear resistance, no dust and short construction period, but also is easy to maintain and suitable for staged construction. Owing to these characteristics, asphalt concrete pavements are widely used for the construction of urban roads.
However, as the increase of the traffic flow exceeds the design expectation and the problems of materials, design, construction and the like, the early damage of the asphalt concrete pavement is serious, the service life is usually shorter than the design service life, the maintenance cost is greatly increased, the traffic is influenced, and the national economic development is severely restricted. At the present stage, the performance of the domestic asphalt is restricted by the properties of crude oil, and most of the domestic asphalt cannot meet the road requirements well. The method adopted at present is to modify the polymer which is miscible in the asphalt, and the prepared polymer modified asphalt better meets the road requirements and is widely applied to high-grade roads.
The domestic patent with the application number of CN201810485281.2 discloses an asphalt concrete for highway construction and a preparation process thereof, wherein the asphalt concrete comprises the following components in parts by weight: 10-20 parts of mixed modified asphalt, 3-5 parts of steel fiber, 60-80 parts of fly ash, 70-80 parts of micro silicon powder, 30-40 parts of broken stone and 40-60 parts of sand stone. The asphalt concrete prepared by the invention has reasonable grading, the interaction force in the asphalt concrete can be greatly improved by adding the steel fiber, the pavement is effectively prevented from generating cracks, the compression resistance degree of the pavement is improved, and the asphalt modified by SBS and polyethylene has higher heat resistance and elasticity than the traditional basic asphalt and improves the thermal stability of the pavement.
However, there are some problems in the practical application of polymer modified asphalt: (1) the polymer is difficult to disperse in the asphalt and is difficult to prepare; (3) the mixing temperature of the modified asphalt mixture is high, so that the asphalt is seriously aged during mixing. Therefore, a more excellent modified material and a more excellent modified method are found, and the method is a way for effectively improving the comprehensive performance of the asphalt concrete pavement by utilizing domestic cheap asphalt on a large scale.
Disclosure of Invention
The invention aims to provide novel asphalt concrete and a preparation process thereof, the mixing temperature is lower, the dispersing performance of each modified substance is good, and the prepared asphalt concrete has strong high-temperature deformation resistance, good ageing resistance, high stability and excellent comprehensive performance.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the novel asphalt concrete is prepared from the following raw materials in percentage by weight: 2.5-4.5% of limestone mineral powder, 2-3.5% of fly ash, 4-6% of asphalt, 0.8-1.3% of modified basalt chopped fiber, 2.5-6% of bentonite loaded nano SiC-TaC composite material and the balance coarse and fine aggregate.
Preferably, the novel asphalt concrete is prepared from the following raw materials in percentage by weight: 3.5% of limestone mineral powder, 2.5% of fly ash, 5.5% of asphalt, 1.2% of modified basalt chopped fiber, 5% of bentonite loaded nano SiC-TaC composite material and the balance coarse and fine aggregate.
Preferably, the coarse and fine aggregates consist of the following aggregates in weight percentage: 18-25% of aggregate with the grain diameter of 0-2.36mm, 16-21% of aggregate with the grain diameter of 2.36-4.75mm, 25-30% of aggregate with the grain diameter of 4.75-9.5mm, and the balance of aggregate with the grain diameter of 9.5-16 mm.
Preferably, the bentonite-loaded nano SiC-TaC composite material is prepared by the following method:
(1) adding a glucose solution with the mass solubility of 30% into bentonite, calcining for 2h at the temperature of 750-;
(2) adopting ethyl orthosilicate as a silicon source, and mixing the ethyl orthosilicate with absolute ethyl alcohol, deionized water and dilute hydrochloric acid to obtain a solution A; dissolving tantalum pentachloride serving as a tantalum source in absolute ethyl alcohol to form a saturated solution B; preparing a 30% glucose aqueous solution to obtain a solution C;
mixing the solution B and the solution A, then adding porous bentonite, sealing the mixed solution and carrying out magnetic stirring; in the process, uniformly dropping the solution C, and adding a dispersing agent and a coagulant; standing the sealed mixed solution in a water bath at 60 +/-2 ℃ for 5-6h to further hydrolyze the mixed solution, and obtaining the porous bentonite/wet gel composite material after 12-15 h; standing for 3-4 days, and performing ethanol reflux treatment to obtain a porous bentonite/xerogel composite material;
(3) the porous bentonite/xerogel composite material is put into a grinder to be ground into powder and then put into a muffle furnace with the temperature of 500-520 ℃ for carbonization to obtain the porous bentonite/C-SiO2-Ta2O5A hybrid precursor composite; then mixing the porous bentonite/C-SiO2-Ta2O5And calcining the hybrid precursor composite material for 2-3h at the temperature of 1350-.
Preferably, in the step (2), the molar ratio of the ethyl orthosilicate to the absolute ethyl alcohol to the deionized water to the hydrogen chloride is 1: 2.5: 2.5: 0.01.
preferably, in the step (2), the mass ratio of the solution A to the solution B to the solution C to the porous bentonite is 1: 1: 2: 5.
preferably, in the step (2), the dispersant is a 1% polyvinyl pyrrolidone aqueous solution by mass, the coagulant is propylene oxide, the adding amount of the dispersant is 1% by mass of the glucose aqueous solution, and the molar ratio of the coagulant to tantalum is 5-6: 1.
preferably, the modified basalt chopped fiber is prepared by the following method: firstly, placing basalt chopped fiber into an acetic acid aqueous solution with the mass concentration of 50% to be soaked for 1h, then filtering, washing with clear water, and drying at the temperature of 90-100 ℃; and then adding a silane coupling agent KH550 and ethanol into water, heating to 45 +/-2 ℃, adding the basalt chopped fibers, stirring for 1h, filtering, and drying at 90-100 ℃ to obtain the modified basalt chopped fibers.
Preferably, the mass ratio of the silane coupling agent KH550 to the ethanol to the water is 1: 4: 0.5.
the preparation process of the novel asphalt concrete comprises the following steps:
(1) weighing the raw materials according to the weight percentage of the raw materials;
(2) heating the coarse and fine aggregates to 130-;
(3) sequentially adding limestone mineral powder, fly ash, modified basalt chopped fiber and a bentonite loaded nano SiC-TaC composite material into a stirrer, stirring at the temperature of 125-130 ℃ for 10-15min, adding the asphalt in the step (2), stirring for 2-3min, continuously adding the coarse and fine aggregate in the step (2), and uniformly stirring to obtain the novel asphalt concrete.
The invention has the beneficial effects that:
1. according to the invention, the bentonite loaded nano SiC-TaC composite material is added into the asphalt concrete, and the nano SiC-TaC composite material has better dispersibility in the concrete, so that the nano SiC-TaC is highly dispersed in the asphalt concrete, and the nano SiC-TaC has high elastic modulus, microhardness and high-temperature oxidation resistance, so that the high-temperature deformation resistance and ageing resistance of the asphalt concrete can be obviously improved.
2. In the invention, when the bentonite loaded with the nano SiC-TaC composite material is prepared, the bentonite is wetted by glucose solution and calcined in an aerobic atmosphere, so that the prepared bentonite has higher pores, the adsorption performance of the porous bentonite is obviously improved, on one hand, more nano SiC-TaC can be adsorbed, meanwhile, the existence of the pores strengthens the tabling property of the modified basalt chopped fiber and the bentonite, and simultaneously, the bonding property of the bentonite loaded with the nano SiC-TaC composite material and other materials can be strengthened, so that the permanent deformation resistance of the asphalt concrete is strong, and the service life is prolonged.
3. The modified basalt chopped fiber added in the invention is the basalt chopped fiber which is sequentially subjected to acid modification and silane coupling agent modification, so that the interface performance between the basalt chopped fiber and each substance can be effectively enhanced, the bonding property between the basalt chopped fiber and other substances is enhanced, the toughening effect of the modified basalt chopped fiber is good, and the mechanical property of asphalt concrete is improved.
4. The modified basalt chopped fibers and the bentonite loaded nano SiC-TaC composite material are added into the asphalt concrete at the same time, and are matched with each other, so that the gap degree between mineral aggregates is effectively reduced, the mixing temperature is lower, the stability of the prepared asphalt concrete is obviously improved, and the anti-rutting performance is strong. On the basis, the asphalt concrete has excellent comprehensive performance by matching with appropriate amount of limestone mineral powder, fly ash and the like.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: preparation of bentonite loaded nano SiC-TaC composite material
The bentonite loaded nano SiC-TaC composite material is prepared by the following method:
(1) adding a glucose solution with the mass solubility of 30% into bentonite, completely wetting the bentonite, calcining the bentonite at 800 ℃ for 2 hours in an aerobic atmosphere, and cooling the bentonite to room temperature along with a furnace to obtain the porous bentonite.
(2) Adopting tetraethoxysilane as a silicon source, mixing the tetraethoxysilane with absolute ethyl alcohol, deionized water and dilute hydrochloric acid, wherein the molar ratio of the tetraethoxysilane to the absolute ethyl alcohol to the deionized water to the hydrogen chloride is 1: 2.5: 2.5: 0.01, obtaining a solution A; dissolving tantalum pentachloride serving as a tantalum source in absolute ethyl alcohol to form a saturated solution B; and preparing a 30% glucose aqueous solution to obtain a solution C.
Mixing the solution B and the solution A, then adding porous bentonite, sealing the mixed solution and carrying out magnetic stirring; in the process, uniformly dropping the solution C, and adding a dispersing agent and a coagulant; standing the sealed mixed solution in a water bath at 60 +/-2 ℃ for further hydrolysis after 5h, and obtaining the porous bentonite/wet gel composite material after 15 h; after standing for 3 days, the porous bentonite/xerogel composite material is obtained by ethanol reflux treatment.
Wherein the mass ratio of the solution A to the solution B to the solution C to the porous bentonite is 1: 1: 2: 5. the dispersing agent is 1% of polyvinylpyrrolidone aqueous solution by mass concentration, the coagulant is propylene oxide, the adding amount of the dispersing agent is 1% of the mass of the glucose aqueous solution, and the molar ratio of the coagulant to tantalum is 6: 1.
(3) the porous bentonite/xerogel composite material is put into a grinder to be ground into powder and then put into a muffle furnace at 520 ℃ to be carbonized to obtain the porous bentonite/C-SiO2-Ta2O5A hybrid precursor composite; then mixing the porous bentonite/C-SiO2-Ta2O5And calcining the hybrid precursor composite material at 1350 ℃ for 3h under the protection of nitrogen, and then cooling to room temperature along with the furnace to prepare the bentonite-loaded nano SiC-TaC composite material.
Example 2: preparation of bentonite loaded nano SiC-TaC composite material
The bentonite loaded nano SiC-TaC composite material is prepared by the following method:
(1) adding a glucose solution with the mass solubility of 30% into bentonite, completely wetting the bentonite, calcining the bentonite at 750 ℃ for 2 hours in an aerobic atmosphere, and cooling the bentonite to room temperature along with a furnace to obtain the porous bentonite.
(2) Adopting tetraethoxysilane as a silicon source, mixing the tetraethoxysilane with absolute ethyl alcohol, deionized water and dilute hydrochloric acid, wherein the molar ratio of the tetraethoxysilane to the absolute ethyl alcohol to the deionized water to the hydrogen chloride is 1: 2.5: 2.5: 0.01, obtaining a solution A; dissolving tantalum pentachloride serving as a tantalum source in absolute ethyl alcohol to form a saturated solution B; and preparing a 30% glucose aqueous solution to obtain a solution C.
Mixing the solution B and the solution A, then adding porous bentonite, sealing the mixed solution and carrying out magnetic stirring; in the process, uniformly dropping the solution C, and adding a dispersing agent and a coagulant; standing the sealed mixed solution in a water bath at 60 +/-2 ℃ for further hydrolysis after 6h, and obtaining the porous bentonite/wet gel composite material after 12 h; after standing for 4 days, the porous bentonite/xerogel composite material is obtained by ethanol reflux treatment.
Wherein the mass ratio of the solution A to the solution B to the solution C to the porous bentonite is 1: 1: 2: 5. the dispersing agent is 1% of polyvinylpyrrolidone aqueous solution by mass concentration, the coagulant is propylene oxide, the adding amount of the dispersing agent is 1% of the mass of the glucose aqueous solution, and the molar ratio of the coagulant to tantalum is 5: 1.
(3) placing the porous bentonite/xerogel composite material in a grinder to be ground into powder, and then placing the powder in a muffle furnace at 500 ℃ for carbonization to obtain the porous bentonite/C-SiO2-Ta2O5A hybrid precursor composite; then mixing the porous bentonite/C-SiO2-Ta2O5And calcining the hybrid precursor composite material at 1420 ℃ for 2h under the protection of nitrogen, and then cooling to room temperature along with the furnace to prepare the bentonite loaded nano SiC-TaC composite material.
Example 3: preparation of modified basalt chopped fiber
The modified basalt chopped fiber is prepared by the following method: firstly, placing basalt chopped fiber into an acetic acid aqueous solution with the mass concentration of 50% to be soaked for 1h, then filtering, washing with clear water, and drying at 100 ℃; and then adding a silane coupling agent KH550 and ethanol into water, heating to 45 +/-2 ℃, adding the basalt chopped fibers, stirring for 1h, filtering, and drying at 100 ℃ to obtain the modified basalt chopped fibers. The mass ratio of the silane coupling agent KH550 to the ethanol to the water is 1: 4: 0.5.
example 4:
the novel asphalt concrete is prepared from the following raw materials in percentage by weight: 3.5% of limestone mineral powder, 2.5% of fly ash, 5.5% of asphalt, 1.2% of modified basalt chopped fiber, 5% of bentonite loaded nano SiC-TaC composite material and the balance coarse and fine aggregate.
The coarse and fine aggregates consist of the following aggregates in percentage by weight: 20 percent of aggregate with the grain diameter of 0-2.36mm, 18 percent of aggregate with the grain diameter of 2.36-4.75mm, 27 percent of aggregate with the grain diameter of 4.75-9.5mm, and the balance of aggregate with the grain diameter of 9.5-16 mm.
The bentonite-loaded nano SiC-TaC composite material is prepared by the method in the embodiment 1, and the modified basalt chopped fiber is prepared by the method in the embodiment 3.
The preparation process of the novel asphalt concrete comprises the following steps:
(1) weighing the raw materials according to the weight percentage of the raw materials;
(2) heating the coarse and fine aggregates to 130 ℃, and heating the asphalt to 135 ℃ for later use;
(3) sequentially adding limestone mineral powder, fly ash, modified basalt chopped fiber and a bentonite loaded nano SiC-TaC composite material into a stirrer, stirring for 15min at 125 ℃, adding the asphalt in the step (2), stirring for 3min, continuously adding the coarse and fine aggregates in the step (2), and uniformly stirring to obtain the novel asphalt concrete.
Example 5:
the novel asphalt concrete is prepared from the following raw materials in percentage by weight: 4.5% of limestone mineral powder, 2% of fly ash, 6% of asphalt, 1.3% of modified basalt chopped fiber, 4.5% of bentonite loaded nano SiC-TaC composite material and the balance coarse and fine aggregate.
The coarse and fine aggregates consist of the following aggregates in percentage by weight: 20 percent of aggregate with the grain diameter of 0-2.36mm, 18 percent of aggregate with the grain diameter of 2.36-4.75mm, 27 percent of aggregate with the grain diameter of 4.75-9.5mm, and the balance of aggregate with the grain diameter of 9.5-16 mm.
The bentonite-loaded nano SiC-TaC composite material is prepared by the method in the embodiment 1, and the modified basalt chopped fiber is prepared by the method in the embodiment 3.
The preparation process of the novel asphalt concrete comprises the following steps:
(1) weighing the raw materials according to the weight percentage of the raw materials;
(2) heating the coarse and fine aggregates to 125 ℃, and heating the asphalt to 130 ℃ for later use;
(3) sequentially adding limestone mineral powder, fly ash, modified basalt chopped fiber and a bentonite loaded nano SiC-TaC composite material into a stirrer, stirring for 15min at 130 ℃, adding the asphalt in the step (2), stirring for 2min, continuously adding the coarse and fine aggregates in the step (2), and uniformly stirring to obtain the novel asphalt concrete.
Example 6:
the novel asphalt concrete is prepared from the following raw materials in percentage by weight: 2.5% of limestone mineral powder, 3.5% of fly ash, 5% of asphalt, 0.8% of modified basalt chopped fiber, 3% of bentonite loaded nano SiC-TaC composite material and the balance coarse and fine aggregate.
The coarse and fine aggregates consist of the following aggregates in percentage by weight: 25% of aggregate with the grain diameter of 0-2.36mm, 16% of aggregate with the grain diameter of 2.36-4.75mm, 25% of aggregate with the grain diameter of 4.75-9.5mm, and the balance of aggregate with the grain diameter of 9.5-16 mm.
The bentonite-loaded nano SiC-TaC composite material is prepared by the method in the embodiment 2, and the modified basalt chopped fiber is prepared by the method in the embodiment 3.
The process for preparing the novel asphalt concrete was the same as in example 5.
Example 7:
the novel asphalt concrete is prepared from the following raw materials in percentage by weight: 4.5% of limestone mineral powder, 3% of fly ash, 5% of asphalt, 1.3% of modified basalt chopped fiber, 2.5% of bentonite loaded nano SiC-TaC composite material and the balance coarse and fine aggregate.
The coarse and fine aggregates consist of the following aggregates in percentage by weight: 18 percent of aggregate with the grain diameter of 0-2.36mm, 18 percent of aggregate with the grain diameter of 2.36-4.75mm, 30 percent of aggregate with the grain diameter of 4.75-9.5mm, and the balance of aggregate with the grain diameter of 9.5-16 mm.
The bentonite-loaded nano SiC-TaC composite material is prepared by the method in the embodiment 2, and the modified basalt chopped fiber is prepared by the method in the embodiment 3.
The process for preparing the novel asphalt concrete is the same as in example 4.
Example 8:
the novel asphalt concrete is prepared from the following raw materials in percentage by weight: 4.5% of limestone mineral powder, 2% of fly ash, 4.5% of asphalt, 1% of modified basalt chopped fiber, 3% of bentonite loaded nano SiC-TaC composite material and the balance coarse and fine aggregate.
The coarse and fine aggregates consist of the following aggregates in percentage by weight: 18 percent of aggregate with the grain diameter of 0-2.36mm, 18 percent of aggregate with the grain diameter of 2.36-4.75mm, 30 percent of aggregate with the grain diameter of 4.75-9.5mm, and the balance of aggregate with the grain diameter of 9.5-16 mm.
The bentonite-loaded nano SiC-TaC composite material is prepared by the method in the embodiment 2, and the modified basalt chopped fiber is prepared by the method in the embodiment 3.
The process for preparing the novel asphalt concrete was the same as in example 5.
Example 9:
the novel asphalt concrete is prepared from the following raw materials in percentage by weight: 2.5% of limestone mineral powder, 3.5% of fly ash, 6% of asphalt, 1.3% of modified basalt chopped fiber, 5% of bentonite loaded nano SiC-TaC composite material and the balance coarse and fine aggregate.
The coarse and fine aggregates consist of the following aggregates in percentage by weight: 25 percent of aggregate with the grain diameter of 0-2.36mm, 16 percent of aggregate with the grain diameter of 2.36-4.75mm, 28 percent of aggregate with the grain diameter of 4.75-9.5mm, and the balance of aggregate with the grain diameter of 9.5-16 mm.
The bentonite-loaded nano SiC-TaC composite material is prepared by the method in the embodiment 1, and the modified basalt chopped fiber is prepared by the method in the embodiment 3.
The process for preparing the novel asphalt concrete is the same as in example 4.
Example 10:
the novel asphalt concrete is prepared from the following raw materials in percentage by weight: 3% of limestone mineral powder, 3% of fly ash, 4% of asphalt, 0.8% of modified basalt chopped fiber, 6% of bentonite loaded nano SiC-TaC composite material and the balance coarse and fine aggregate.
The coarse and fine aggregates consist of the following aggregates in percentage by weight: 20 percent of aggregate with the grain diameter of 0-2.36mm, 21 percent of aggregate with the grain diameter of 2.36-4.75mm, 25 percent of aggregate with the grain diameter of 4.75-9.5mm, and the balance of aggregate with the grain diameter of 9.5-16 mm.
The bentonite-loaded nano SiC-TaC composite material is prepared by the method in the embodiment 2, and the modified basalt chopped fiber is prepared by the method in the embodiment 3.
The process for preparing the novel asphalt concrete was the same as in example 5.
Comparative example 4:
the novel asphalt concrete is prepared from the following raw materials in percentage by weight: 3.5 percent of limestone mineral powder, 2.5 percent of fly ash, 5.5 percent of asphalt, 6.2 percent of modified basalt chopped fiber and the balance of coarse and fine aggregates.
The coarse and fine aggregates consist of the following aggregates in percentage by weight: 20 percent of aggregate with the grain diameter of 0-2.36mm, 18 percent of aggregate with the grain diameter of 2.36-4.75mm, 27 percent of aggregate with the grain diameter of 4.75-9.5mm, and the balance of aggregate with the grain diameter of 9.5-16 mm.
The modified basalt chopped strand was prepared by the method in example 3.
Preparation of novel asphalt concrete reference is made to example 4.
And (3) performance testing:
the asphalt concretes of examples 4 to 10 and comparative example 1 were tested for their properties.
1. And (3) carrying out retrograde test on the dynamic stability of the rutting test, the Marshall stability and the residual stability of the water-immersed Marshall test on the asphalt concrete. Specific test results are shown in table 1.
Table 1:
2. and (3) performing a freeze-thaw splitting test and a low-temperature bending limit strain test on the asphalt concrete. Specific test results are shown in table 2.
Table 2:
as can be seen from tables 1 and 2, the asphalt concretes prepared in the embodiments 4-10 of the invention have excellent comprehensive performance and are obviously superior to the asphalt concrete without adding the bentonite loaded nano SiC-TaC composite material.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The novel asphalt concrete is characterized by being prepared from the following raw materials in percentage by weight: 2.5-4.5% of limestone mineral powder, 2-3.5% of fly ash, 4-6% of asphalt, 0.8-1.3% of modified basalt chopped fiber, 2.5-6% of bentonite loaded nano SiC-TaC composite material and the balance coarse and fine aggregate.
2. The novel asphalt concrete according to claim 1, which is prepared from the following raw materials in percentage by weight: 3.5% of limestone mineral powder, 2.5% of fly ash, 5.5% of asphalt, 1.2% of modified basalt chopped fiber, 5% of bentonite loaded nano SiC-TaC composite material and the balance coarse and fine aggregate.
3. The novel asphalt concrete according to claim 1, wherein the coarse and fine aggregates consist of the following aggregates in weight percent: 18-25% of aggregate with the grain diameter of 0-2.36mm, 16-21% of aggregate with the grain diameter of 2.36-4.75mm, 25-30% of aggregate with the grain diameter of 4.75-9.5mm, and the balance of aggregate with the grain diameter of 9.5-16 mm.
4. The novel asphalt concrete according to claim 1, wherein the bentonite-supported nano SiC-TaC composite material is prepared by the following method:
(1) adding a glucose solution with the mass solubility of 30% into bentonite, calcining for 2h at the temperature of 750-;
(2) adopting ethyl orthosilicate as a silicon source, and mixing the ethyl orthosilicate with absolute ethyl alcohol, deionized water and dilute hydrochloric acid to obtain a solution A; dissolving tantalum pentachloride serving as a tantalum source in absolute ethyl alcohol to form a saturated solution B; preparing a 30% glucose aqueous solution to obtain a solution C;
mixing the solution B and the solution A, then adding porous bentonite, sealing the mixed solution and carrying out magnetic stirring; in the process, uniformly dropping the solution C, and adding a dispersing agent and a coagulant; standing the sealed mixed solution in a water bath at 60 +/-2 ℃ for 5-6h to further hydrolyze the mixed solution, and obtaining the porous bentonite/wet gel composite material after 12-15 h; standing for 3-4 days, and performing ethanol reflux treatment to obtain a porous bentonite/xerogel composite material;
(3) the porous bentonite/xerogel composite material is put into a grinder to be ground into powder and then put into a muffle furnace with the temperature of 500-520 ℃ for carbonization to obtain the porous bentonite/C-SiO2-Ta2O5A hybrid precursor composite; then mixing the porous bentonite/C-SiO2-Ta2O5And calcining the hybrid precursor composite material for 2-3h at the temperature of 1350-.
5. The novel asphalt concrete according to claim 4, wherein in the step (2), the molar ratio of the ethyl orthosilicate to the absolute ethyl alcohol to the deionized water to the hydrogen chloride is 1: 2.5: 2.5: 0.01.
6. the novel asphalt concrete according to claim 4, wherein in the step (2), the mass ratio of the solution A to the solution B to the solution C to the porous bentonite is 1: 1: 2: 5.
7. the novel asphalt concrete according to claim 4, wherein in the step (2), the dispersing agent is 1% by mass of polyvinylpyrrolidone aqueous solution, the coagulant is propylene oxide, the amount of the dispersing agent added is 1% by mass of the glucose aqueous solution, and the molar ratio of the coagulant to tantalum is 5-6: 1.
8. the novel asphalt concrete according to claim 1, wherein the modified basalt chopped fiber is prepared by the following method: firstly, placing basalt chopped fiber into an acetic acid aqueous solution with the mass concentration of 50% to be soaked for 1h, then filtering, washing with clear water, and drying at the temperature of 90-100 ℃; and then adding a silane coupling agent KH550 and ethanol into water, heating to 45 +/-2 ℃, adding the basalt chopped fibers, stirring for 1h, filtering, and drying at 90-100 ℃ to obtain the modified basalt chopped fibers.
9. The novel asphalt concrete according to claim 8, wherein the mass ratio of the silane coupling agent KH550 to the ethanol to the water is 1: 4: 0.5.
10. process for the preparation of a new bituminous concrete according to any one of claims 1 to 9, characterized in that it comprises the following steps:
(1) weighing the raw materials according to the weight percentage of the raw materials;
(2) heating the coarse and fine aggregates to 130-;
(3) sequentially adding limestone mineral powder, fly ash, modified basalt chopped fiber and a bentonite loaded nano SiC-TaC composite material into a stirrer, stirring at the temperature of 125-130 ℃ for 10-15min, adding the asphalt in the step (2), stirring for 2-3min, continuously adding the coarse and fine aggregate in the step (2), and uniformly stirring to obtain the novel asphalt concrete.
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