CN114538821A - Composite modified red mud-based asphalt anti-aging agent, preparation method and application - Google Patents
Composite modified red mud-based asphalt anti-aging agent, preparation method and application Download PDFInfo
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/182—Aggregate or filler materials, except those according to E01C7/26
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/605—UV-stabilising agents
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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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- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
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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 invention relates to a composite modified red mud-based asphalt anti-aging agent, which comprises the following components in parts by weight: 40-70 parts of red mud, 1-3 parts of nano material, 10-30 parts of red mud modified material, 1-2 parts of chemical solvent and 10-20 parts of aromatic oil; further, the chemical solvent is a coupling agent, preferably, one or a mixture of several selected from a silane coupling agent, a titanate coupling agent, and an aluminate coupling agent. Further, the red mud modified material is one or a mixture of more of slaked lime, montmorillonite and cement. According to the invention, the red mud is subjected to composite modification by using the coupling agent, so that the comprehensive performance of the modified red mud can be effectively improved, and the modified red mud can play a role in blocking ultraviolet rays and oxygen, so that the aim of resisting ageing of the asphalt mixture is fulfilled.
Description
The technical field is as follows:
the invention belongs to the technical field of road engineering materials and preparation, and relates to a composite modified red mud-based asphalt anti-aging agent, a preparation method and application.
Background art:
the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Because ultraviolet rays have larger energy, the intermolecular fracture recombination in the asphalt is generated, the aroma is converted into colloid, the colloid is converted into asphaltene, and the specific gravity of the asphaltene in the asphalt is increased, so that the asphalt is converted from a sol type structure to a gel type structure; under the action of ultraviolet light, asphalt becomes dry, wet, brittle and hard, the low-temperature shearing of the asphalt is increased, the failure strain is reduced, and macroscopically, the asphalt pavement generates diseases such as cracks, peeling, pits and the like, the service performance of the asphalt pavement is degraded, and the service life of the asphalt pavement is shortened.
Corresponding experimental researches are carried out by scholars at home and abroad aiming at the application of the red mud powder in the performances of the asphalt and the asphalt mixture. The package of the university of Guilin science and technology teaches and teaches that the red mud modified asphalt is prepared by utilizing the multi-gap structure and the larger specific surface area of the red mud and the performance of the red mud modified asphalt is researched. Researches find that the red mud can obviously improve the viscosity and the high-temperature stability of the asphalt, and the red mud particles can be uniformly distributed in the asphalt and form a good adsorption interface with the asphalt. In the research on the red mud modified asphalt mixture, the high-temperature stability, the low-temperature crack resistance and the water damage resistance of the asphalt mixture can be improved by adjusting the mixing amount of the red mud. Lihui professor of the university of the same university finds that the porous structure of the red mud can absorb more asphalt components, so that the viscosity is increased and the workability is reduced, prepares the pervious asphalt concrete by replacing limestone mineral powder with the red mud, and researches the performance of the pervious asphalt concrete. Researches find that the red mud can improve the strain recovery rate of the asphalt to improve the high-temperature performance of the asphalt and improve the adhesion between the asphalt and aggregates to improve the anti-loosening property of the asphalt mixture after replacing the mineral powder, and prove that the red mud can be used as a substitute material of limestone mineral powder for preparing the asphalt mixture.
However, the aging problem of red mud cannot be solved by using a single raw material, and the preparation of an anti-aging agent having excellent anti-aging performance by using red mud in combination with other raw materials has been studied.
The invention content is as follows:
the invention aims to overcome the defects of the prior art and provide a composite modified red mud-based asphalt anti-aging agent, which can solve the problem of early diseases caused by rapid aging of an asphalt pavement and can realize high-value utilization of red mud.
Based on the research results, the invention provides the following technical scheme:
the invention discloses a composite modified red mud-based asphalt anti-aging agent, which comprises the following raw materials in parts by weight: 40-70 parts of red mud, 1-3 parts of nano material, 10-30 parts of red mud modified material, 1-2 parts of chemical solvent and 10-20 parts of aromatic oil;
further, the chemical solvent is a coupling agent, preferably, one or a mixture of several selected from a silane coupling agent, a titanate coupling agent and an aluminate coupling agent;
further, the red mud modified material is one or a mixture of more of slaked lime, montmorillonite and cement;
the second aspect of the invention discloses a preparation method of the composite modified red mud-based asphalt anti-aging agent, which comprises the following steps:
(1) drying the red mud and the red mud modified material for later use;
(2) and (2) respectively crushing the materials dried in the step (1), and then drying again to obtain corresponding powder for later use.
(3) After the nano material is activated, the nano material and a coupling agent are dispersed in the solution together according to a proportion, and heating reflux is carried out after the nano material and the coupling agent are dispersed.
(4) And (3) uniformly mixing the powder obtained in the steps (2) and (3), and uniformly mixing the powder with a coupling agent and aromatic oil to obtain the composite material.
The third aspect of the invention discloses an anti-aging asphalt mixture, which comprises the following raw materials in parts by weight: 40-80 parts of coarse aggregate, 10-60 parts of fine aggregate, 3-6 parts of asphalt, 3-5 parts of filler,
wherein, the asphalt accounts for 97-98% by mass, and the composite modified red mud-based asphalt anti-aging agent accounts for 2-3% by mass.
The fourth aspect of the invention discloses a preparation method of the anti-aging asphalt mixture, which comprises the following steps:
(1) and starting a shearing mixer, heating and melting the asphalt, mixing the asphalt with the composite modified red mud-based asphalt anti-aging agent in proportion, and uniformly mixing to obtain the anti-aging modified asphalt.
(2) And (2) respectively heating the coarse aggregate, the fine aggregate and the filler, then uniformly mixing the coarse aggregate and the fine aggregate according to a proportion, and adding the anti-aging modified asphalt obtained in the step (1) to obtain a pre-mixture.
(3) And (3) adding the filler into the pre-mixture obtained in the step (2) in proportion, and uniformly mixing to obtain the anti-aging asphalt mixture.
The fifth aspect of the invention discloses an application of the composite modified red mud-based asphalt anti-aging agent and/or the composite modified red mud-based asphalt anti-aging agent prepared by the method in the field of road and bridge engineering.
The sixth aspect of the invention discloses an application of the anti-aging asphalt mixture and/or the anti-aging asphalt mixture prepared by the method in the fields of road and bridge engineering.
The invention has the beneficial effects that:
(1) according to the invention, the red mud is subjected to composite modification by using the coupling agent, so that the comprehensive performance of the modified red mud can be effectively improved, and the modified red mud can play a role in blocking ultraviolet rays and oxygen, so that the aim of resisting ageing of the asphalt mixture is fulfilled.
(2) The anti-aging asphalt mixture provided by the invention has good high-temperature rutting resistance, low-temperature cracking resistance and water stability, and the dynamic modulus is obviously improved, so that the diseases of an asphalt pavement caused by aging during service can be reduced, the service time of a road is prolonged, and the maintenance cost of the road is reduced.
(3) The main components of the composite modified red mud-based asphalt anti-aging agent provided by the invention are solid wastes such as red mud, the red mud is used as a bulk industrial solid waste material, and the resource utilization of the red mud in asphalt concrete is an important direction for realizing green development, conservation and intensification of traffic infrastructure, low carbon and environmental protection.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, ultraviolet rays can cause various diseases of asphalt pavement, deteriorate the service performance of the asphalt pavement and shorten the service life of the asphalt pavement, and the prior art has a technical scheme of preparing the anti-aging agent by using red mud. Therefore, the disclosure provides a composite modified red mud-based asphalt anti-aging agent, which can effectively solve the technical problems.
The invention discloses a composite modified red mud based asphalt anti-aging agent, which comprises the following raw materials in parts by weight: 40-70 parts of red mud, 1-3 parts of nano material, 10-30 parts of red mud modified material, 1-2 parts of chemical solvent and 10-20 parts of aromatic oil;
further, the chemical solvent is a coupling agent, preferably one or a mixture of more of silane coupling agent, titanate coupling agent and aluminate coupling agent, and the addition of the coupling agent can increase the connection degree of the interface and improve the dispersibility;
further, the red mud modified material is one or a mixture of more of slaked lime, montmorillonite and cement;
the aromatic oil has the main function of enhancing the oxidation and aging resistance of the asphalt, and has good rubber compatibility and can increase the adhesive property of rubber materials and help the mixing and dispersion of fillers in the asphalt mixture;
further, the nano material is nano SiO2Nano TiO 22Nano ZnO2The addition of the nano material can simultaneously improve the thermal oxygen resistance and the light oxygen aging resistance of the asphalt and improve the fatigue resistance of the asphalt after long-term aging;
further, the red mud is at least one of sintering process red mud or Bayer process red mud.
The research of the application finds that: after the red mud is mixed with the asphalt, more free asphalt is absorbed into structural asphalt due to the porous and macroporous structure of the red mud, so that the low-temperature performance of the asphalt is reduced. Meanwhile, the red mud has high alkali metal content and is easy to react with weakly acidic groups in the asphalt to generate a substance with an emulsifying effect, which is represented by macroscopically that an asphalt film is easy to strip water, so that the adhesion of an asphalt-aggregate interface is reduced.
Therefore, after several commonly used asphalt modified mixtures are compounded, the application discovers that: the addition of the red mud modifier can effectively improve the comprehensive performance of the modified asphalt mixture, solve the problem of aging of the asphalt pavement in the road service process and prolong the service life of the asphalt pavement.
The red mud is modified by slaked lime, montmorillonite and cement, so that the characteristic of insufficient stability of the conventional modified red mud water can be well improved, and the low-temperature crack resistance of the asphalt, the interfacial fracture performance of the asphalt and aggregate and the water stability of the asphalt mixture are improved.
The coupling agent can reduce the fatigue factor of the asphalt, improve the fatigue performance of the asphalt and improve the interface strength of the asphalt-aggregate and the water stability of the asphalt mixture.
The second aspect of the invention discloses a preparation method of the composite modified red mud-based asphalt anti-aging agent, which comprises the following steps:
(1) drying the red mud and the red mud modified material for later use;
(2) and (2) respectively crushing the materials dried in the step (1), and then drying again to obtain corresponding powder for later use.
(3) After the nano material is activated, the nano material and a coupling agent are dispersed in the solution together according to a proportion, and heating reflux is carried out after the nano material and the coupling agent are dispersed.
(4) And (3) uniformly mixing the powder obtained in the steps (2) and (3), and uniformly mixing the powder with a coupling agent and aromatic oil to obtain the composite material.
Further, in the step (1), the red mud modified material is a mixture of red mud, slaked lime and montmorillonite.
Further, in the step (1), the drying temperature is 100-. The excessive moisture in each material can be removed through drying, so that the subsequent uniform mixing is facilitated.
Further, in the step (2), the crushing method comprises the following steps: ball milling for 10-40min, and grinding to the required particle size of the filler in technical Specification for road asphalt pavement construction (JTG F40-2004).
Further, in the step (2), the drying temperature is 100-.
Further, in the step (3), the activation conditions are as follows: the activation temperature is 350-500 ℃, the activation time is 3.5-6h, and the activation time is preferably 5h at 400 ℃.
Further, in the step (3), the solution is a toluene solution with water removed, further, the dispersion mode is ultrasonic dispersion, and the time is 7-12min, preferably 10 min.
Further, in the step (3), the heating reflux temperature is as follows: 115 deg.C and 120 deg.C until no drop is dropped.
Further, in the step (3), the modified nano material can be obtained by the processes of cooling, centrifuging, precipitating, washing and drying after heating and refluxing; further, the centrifugal rotating speed is 11000-14000r/min, the washing solvent is ethanol, and the washing times are 3-5 times.
Further, in the step (4), the mixing time can be selected to be 10-40min, or any other suitable mixing time can be used.
The third aspect of the invention discloses an anti-aging asphalt mixture, which comprises the following raw materials in parts by weight: 40-80 parts of coarse aggregate, 10-60 parts of fine aggregate, 3-6 parts of asphalt, 3-5 parts of filler,
wherein, the asphalt accounts for 97-98% by mass, and the composite modified red mud-based asphalt anti-aging agent accounts for 2-3% by mass.
The asphalt mixture types include: any one of AC13, AC20, AC25, SMA13, and the like.
The aggregate comprises any one of limestone, basalt, diabase, granite and the like, and meets the requirements of technical Specification for road asphalt pavement construction (JTG F40-2004) on coarse aggregate.
The asphalt comprises any one of 70# matrix asphalt, SBS modified asphalt and the like, and meets the requirements of technical Specifications for road asphalt pavement construction (JTG F40-2004) on asphalt.
The filler is limestone mineral powder, and meets the requirements of technical Specifications for road asphalt pavement construction (JTG F40-2004) on the filler.
The fourth aspect of the invention discloses a preparation method of the anti-aging asphalt mixture, which comprises the following steps:
(1) and starting a shearing stirrer, heating and melting the asphalt, mixing the asphalt with the composite modified red mud-based asphalt anti-aging agent in proportion, and uniformly mixing to obtain the anti-aging modified asphalt.
(2) And (2) respectively heating the coarse aggregate, the fine aggregate and the filler, then uniformly mixing the coarse aggregate and the fine aggregate according to a proportion, and adding the anti-aging modified asphalt obtained in the step (1) to obtain a pre-mixture.
(3) And (3) adding the filler into the mixture obtained in the step (2) in proportion, and uniformly mixing to obtain the anti-aging asphalt mixture.
Further, in the step (1), the heating conditions are as follows: heating at 130-170 ℃ for 1-3 h.
Further, in the step (2), the heating conditions are: heating at 160-180 ℃ for 2-5 h.
The fifth aspect of the invention discloses an application of the composite modified red mud-based asphalt anti-aging agent and/or the composite modified red mud-based asphalt anti-aging agent prepared by the method in the field of road and bridge engineering.
The sixth aspect of the invention discloses an application of the anti-aging asphalt mixture and/or the anti-aging asphalt mixture prepared by the method in the fields of road and bridge engineering.
In order to make the technical solutions of the present disclosure more clearly understood by those skilled in the art, the technical solutions of the present disclosure will be described in detail below with reference to specific examples and comparative examples.
First embodiment
1. A preparation method of a composite modified red mud-based asphalt anti-aging agent comprises the following steps:
(1) and respectively placing the sintering red mud, slaked lime, montmorillonite and cement in a drying oven at 100 ℃ for drying for 3 hours.
(2) And (2) ball-milling the four dried raw materials in the step (1) in a ball mill for 20min, and grinding to obtain the particle size required by the filler in technical Specification for road asphalt pavement construction (JTG F400-2004). Then the powder after ball milling is placed in an oven at 100 ℃ for 3h until being dried.
(3) Mixing nano SiO2Activating at 400 ℃ for 5h, dispersing the activated product and a silane coupling agent in a dehydrated toluene solution (the silane coupling agent accounts for 5 mass percent of the silane coupling agent), ultrasonically dispersing for 10min, and heating to 115 ℃ for refluxing until no liquid drops drop. And stopping reaction and cooling after the reaction period, centrifuging at 13000r/min, precipitating, washing for 3 times by using anhydrous ethanol, and drying to obtain the modified nano material.
(4) And (3) mixing the five kinds of powder obtained in the steps (2) and (3) with 1 part of silane coupling agent and 10 parts of aromatic oil according to the proportion (40 parts of sintering red mud, 3 parts of cement, 3 parts of montmorillonite, 4 parts of slaked lime and 1 part of modified nano-silica), and stirring for 10min to obtain the composite modified red mud-based asphalt anti-aging agent.
2. The preparation method of the anti-aging asphalt mixture comprises the following steps:
(1) weighing raw materials: weighing the following components in parts by weight: 60 parts of limestone coarse aggregate, 40 parts of limestone fine aggregate, 3 parts of No. 70 matrix asphalt, 2% of anti-aging agent (the mass percentages of the raw materials are 98% of asphalt and 2% of anti-aging agent) and 3 parts of limestone mineral powder (filler). Each technical index of each raw material meets the relevant requirements in technical Specification for construction of asphalt road surfaces for highways (JTG F40-2004); type of asphalt mixture: and (3) AC-20.
(2) Starting a shearing stirrer, heating the No. 70 matrix asphalt at 130 ℃ for 3 hours until the matrix asphalt is melted, then proportionally adding the composite modified red mud-based asphalt anti-aging agent prepared in the embodiment, and stirring for 1 hour by using the stirrer until the mixture is uniformly mixed, wherein the stirring speed is 300 revolutions per minute, and the stirring temperature is 130 ℃, so as to obtain the anti-aging modified asphalt.
(3) And (3) heating the coarse aggregate, the fine aggregate and the filler at 160 ℃ for 3h, then pouring the coarse aggregate and the fine aggregate into a mixing pot, stirring for 90s, then adding the anti-aging modified asphalt obtained in the step (2), and stirring for 90s to obtain a pre-mixture.
(4) And (4) adding the filler into the mixture obtained in the step (3), and stirring for 90s to obtain the anti-aging asphalt mixture.
Second embodiment
1. A preparation method of a composite modified red mud-based asphalt anti-aging agent comprises the following steps:
(1) and respectively placing the sintering red mud, slaked lime, montmorillonite and cement in a drying oven at 150 ℃ for drying for 5 hours.
(2) And (2) ball-milling the four dried raw materials in the step (1) in a ball mill for 50min respectively, and grinding to obtain the particle size required by the filler in technical Specification for road asphalt pavement construction (JTG F40-2004). Then the powder after ball milling is placed in an oven at 150 ℃ for 5h until being dried.
(3) Mixing nanometer TiO2Activating at 400 ℃ for 5h, dispersing the mixture and a titanate coupling agent in a dehydrated toluene solution (the titanate coupling agent accounts for 5 mass percent of the titanate coupling agent), ultrasonically dispersing for 10min, and heating to 110 ℃ for refluxing until no liquid drops drop. And stopping reaction and cooling after the reaction period, centrifuging at 13000r/min, precipitating, washing for 3 times by using anhydrous ethanol, and drying to obtain the modified nano material.
(4) And (3) mixing the five kinds of powder obtained in the steps (2) and (3) with 2 parts of titanate coupling agent and 20 parts of aromatic oil according to the proportion (70 parts of sintering red mud, 10 parts of cement, 10 parts of montmorillonite, 10 parts of slaked lime and 3 parts of modified nano titanium dioxide), and stirring for 30min to obtain the composite modified red mud-based asphalt anti-aging agent.
2. The preparation method of the anti-aging asphalt mixture comprises the following steps:
(1) weighing raw materials: weighing the following components in parts by weight: 60 parts of basalt coarse aggregate, 40 parts of basalt fine aggregate, 6 parts of SBS modified asphalt, 3% of age resister (the mass percentage of the raw materials is 97% of asphalt and 3% of age resister), and 3 parts of limestone mineral powder (filler). Each technical index of each raw material meets the relevant requirements in technical Specification for construction of asphalt road surfaces for highways (JTG F40-2004); type of asphalt mixture: and (4) AC-25.
(2) Starting a shear mixer, heating SBS modified asphalt at 170 ℃ for 2 hours until the SBS modified asphalt is molten, then proportionally mixing the composite modified red mud-based asphalt anti-aging agent prepared in the embodiment, and stirring for 1 hour by using the mixer until the mixture is uniformly mixed, wherein the stirring speed is 300 revolutions per minute, and the stirring temperature is 145 ℃ to obtain the anti-aging modified asphalt.
(3) And (3) heating the coarse aggregate, the fine aggregate and the filler at 170 ℃ for 4h, pouring the coarse aggregate and the fine aggregate into a mixing pot, stirring for 90s, adding the anti-aging modified asphalt obtained in the step (2), and stirring for 90s to obtain a pre-mixture.
(4) And (4) adding the filler into the mixture obtained in the step (3), and stirring for 90s to obtain the anti-aging asphalt mixture.
Third embodiment
A preparation method of a composite modified red mud-based asphalt anti-aging agent comprises the following steps:
(1) and respectively placing the sintering red mud, slaked lime, montmorillonite and cement in a 120 ℃ oven for drying for 3 hours.
(2) And (2) ball-milling the four dried raw materials in the step (1) in a ball mill for 40min respectively, and grinding to obtain the particle size required by the filler in technical Specification for road asphalt pavement construction (JTG F40-2004). Then the powder after ball milling is placed in an oven at 120 ℃ for 4h until being dried.
(3) Nano ZnO2Activating at 400 ℃ for 5h, dispersing the activated particles and an aluminate coupling agent together in a dehydrated toluene solution (the aluminate coupling agent accounts for 5 percent by mass of the raw materials), ultrasonically dispersing for 10min, and heating to 120 ℃ for refluxing until no liquid drops drop. Stopping reaction and cooling after the reaction period, centrifuging at 13000r/min, precipitating, washing for 3 times by using anhydrous ethanol, and drying to obtain the modified nano material.
(4) And (3) mixing the five kinds of powder obtained in the steps (2) and (3) with 1 part of aluminate coupling agent and 15 parts of aromatic oil according to the proportion (60 parts of Bayer process red mud, 5 parts of cement, 5 parts of montmorillonite, 10 parts of slaked lime and 2 parts of modified nano zinc dioxide), and stirring for 40min to obtain the composite modified red mud-based asphalt anti-aging agent.
2. The preparation method of the anti-aging asphalt mixture comprises the following steps:
(1) weighing raw materials: weighing the following components in parts by weight: 80 parts of granite coarse aggregate, 60 parts of granite fine aggregate, 4 parts of No. 70 matrix asphalt, 3% of anti-aging agent (the mass percentage of the raw materials is 97% of asphalt and 3% of anti-aging agent), and 3 parts of limestone mineral powder (filler). Each technical index of each raw material meets the relevant requirements in technical Specification for construction of asphalt road surfaces for highways (JTG F40-2004); type of asphalt mixture: SMA-13.
(2) Starting a shear mixer, heating the No. 70 matrix asphalt at 145 ℃ for 3 hours until the matrix asphalt is melted, then proportionally adding the composite modified red mud-based asphalt anti-aging agent prepared in the embodiment, and stirring for 1 hour by using the mixer until the mixture is uniformly mixed, wherein the stirring speed is 300 revolutions per minute, and the stirring temperature is 145 ℃ to obtain the anti-aging modified asphalt.
(3) And (3) heating the coarse aggregate, the fine aggregate and the filler at 170 ℃ for 5h, pouring the coarse aggregate and the fine aggregate into a mixing pot, stirring for 90s, adding the anti-aging modified asphalt obtained in the step (2), and stirring for 90s to obtain a pre-mixture.
(4) And (4) adding the filler into the mixture obtained in the step (3), and stirring for 90s to obtain the anti-aging asphalt mixture.
Fourth embodiment
1. A preparation method of a composite modified red mud-based asphalt anti-aging agent comprises the following steps:
(1) and respectively placing the sintering red mud, slaked lime, montmorillonite and cement in a 130 ℃ oven for drying for 2 h.
(2) And (2) ball-milling the four dried raw materials in the step (1) in a ball mill for 30min respectively, and grinding to obtain the particle size required by the filler in technical Specification for road asphalt pavement construction (JTG F40-2004). Then the powder after ball milling is placed in an oven at 130 ℃ for 1h until being dried.
(3) Mixing nano SiO2Activating at 400 ℃ for 5h, dispersing the activated product and a silane coupling agent in a dehydrated toluene solution (the silane coupling agent accounts for 5 mass percent of the silane coupling agent), ultrasonically dispersing for 10min, and heating to 115 ℃ for refluxing until no liquid drops drop. After the reaction period, the reaction is stopped and cooled, centrifuged at 13000r/min, precipitated and washed with waterWashing with waterless ethanol for 3 times, and drying to obtain the modified nanometer material.
(4) And (3) mixing the five kinds of powder obtained in the steps (2) and (3) with 1 part of aluminate coupling agent and 15 parts of aromatic oil according to the proportion (50 parts of sintering red mud, 5 parts of cement, 5 parts of montmorillonite, 5 parts of slaked lime and 1 part of modified nano-silica), and stirring for 35min to obtain the composite modified red mud-based asphalt anti-aging agent.
2. The preparation method of the anti-aging asphalt mixture comprises the following steps:
(1) weighing raw materials: weighing the following components in parts by weight: 40 parts of diabase coarse aggregate, 10 parts of diabase fine aggregate, 5 parts of No. 70 matrix asphalt, 2% of anti-aging agent (the mass percentage of the raw materials is 98% of asphalt and 2% of anti-aging agent), and 5 parts of limestone mineral powder (filler). Each technical index of each raw material meets the relevant requirements in technical Specification for construction of asphalt road surfaces for highways (JTG F40-2004); type of asphalt mixture: and (6) AC-13.
(2) Starting a shear mixer, heating the No. 70 matrix asphalt at 150 ℃ for 2 hours until the matrix asphalt is melted, then proportionally adding the composite modified red mud-based asphalt anti-aging agent prepared in the embodiment, and stirring for 1 hour by using the mixer until the mixture is uniformly mixed, wherein the stirring speed is 300 revolutions per minute, and the stirring temperature is 145 ℃, so as to obtain the anti-aging modified asphalt.
(3) And (3) heating the coarse aggregate, the fine aggregate and the filler at 180 ℃ for 2h, then pouring the coarse aggregate and the fine aggregate into a mixing pot, stirring for 90s, then adding the anti-aging modified asphalt obtained in the step (2), and stirring for 90s to obtain a pre-mixture.
(4) And (4) adding the filler into the mixture obtained in the step (3), and stirring for 90s to obtain the anti-aging asphalt mixture.
Fifth embodiment
The preparation method of the anti-aging asphalt mixture comprises the following steps:
(1) weighing raw materials: weighing the following components in parts by weight: 60 parts of limestone coarse aggregate, 30 parts of limestone fine aggregate, 3 parts of No. 70 matrix asphalt and 3 parts of limestone mineral powder (filler). Each technical index of each raw material meets the relevant requirements in technical Specification for construction of asphalt road surfaces for highways (JTG F40-2004); type of asphalt mixture: and (3) AC-20.
(2) Starting a shear mixer, and heating the No. 70 matrix asphalt at 130 ℃ for 3h until the matrix asphalt is melted for standby.
(3) And (3) heating the coarse aggregate, the fine aggregate and the filler at 160 ℃ for 3h, then pouring the coarse aggregate and the fine aggregate into a mixing pot, stirring for 90s, then adding the melted asphalt obtained in the step (2), and stirring for 90s to obtain a pre-mixture.
(4) And (4) adding the filler into the mixture obtained in the step (3), and stirring for 90s to obtain the anti-aging asphalt mixture.
In order to evaluate the influence of the composite modified red mud-based asphalt anti-aging agent on the performance of the asphalt mixture, the fifth embodiment is compared with the first embodiment, and the fifth embodiment is the asphalt mixture added with the red mud anti-aging agent which is not subjected to composite modification.
And (3) performance testing: and (2) performing a freeze-thaw splitting test and a water immersion Marshall test on the obtained modified asphalt mixture, performing an ultraviolet aging test (ultraviolet aging condition: aging for 6 days at 60 ℃ under the ultraviolet aging strength of 8W/square meter) under a short-term aging (RTFOT), and researching the ultraviolet aging resistance of the modified asphalt by adopting Softening Point Increment (SPI) and Viscosity Aging Index (VAI).
From the above performance test results, it can be seen that:
(1) after the composite modified red mud-based asphalt anti-aging agent is added, the freeze-thaw splitting strength ratio and the soaking residual stability of the asphalt mixture obtained by performing a freeze-thaw splitting test and a soaking Marshall test are obviously improved, which shows that the composite modified red mud-based asphalt anti-aging agent prepared by the invention can effectively improve the water stability of the asphalt mixture.
(2) According to the Softening Point Increment (SPI) of the test result, after ultraviolet aging, the SPI of the asphalt mixture without the anti-aging agent is the highest, which indicates that the anti-ultraviolet aging capability of the asphalt mixture is weaker, and the SPI value of the anti-aging agent added with the composite modified red mud-based asphalt prepared by the invention is generally lower than the SPI value without the anti-aging agent, which indicates that the anti-ultraviolet aging capability of the asphalt mixture is increased relative to the asphalt mixture without the composite modified red mud-based asphalt anti-aging agent;
(3) according to the Viscosity Aging Index (VAI) of the test result, after ultraviolet aging, the VAI of the asphalt mixture obtained without adding an anti-aging agent is the highest, which shows that the anti-ultraviolet aging capability of the asphalt mixture is weaker, the VAI value of the composite modified red mud-based asphalt anti-aging agent prepared by the invention is generally lower than the VAI value without adding the anti-aging agent, which shows that the anti-ultraviolet aging capability of the asphalt mixture is increased relative to the asphalt mixture without adding the composite modified red mud-based asphalt anti-aging agent;
the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The composite modified red mud-based asphalt anti-aging agent is characterized by comprising the following components in parts by weight: the method comprises the following steps: 40-70 parts of red mud, 1-3 parts of nano material, 10-30 parts of red mud modified material, 1-2 parts of chemical solvent and 10-20 parts of aromatic oil;
further, the chemical solvent is a coupling agent, and is further selected from one or a mixture of more of a silane coupling agent, a titanate coupling agent and an aluminate coupling agent;
further, the red mud modified material is any one or a mixture of more of slaked lime, montmorillonite and cement.
2. The composite modified red mud-based asphalt anti-aging agent of claim 1, which is characterized in that: the red mud is any one or a mixture of two of sintering process red mud and Bayer process red mud; the nano material is nano SiO2TiO 2 nanoparticles2Nano ZnO2A mixture of one or more of them.
3. The preparation method of the composite modified red mud-based asphalt anti-aging agent of claim 1 or 2, which is characterized by comprising the following steps: the method comprises the following steps:
(1) drying the red mud and the red mud modified material for later use;
(2) respectively crushing the materials dried in the step (1), and then drying again to obtain corresponding powder for later use;
(3) activating the nano material, dispersing the activated nano material and a coupling agent in the solution together in proportion, and heating and refluxing the dispersed nano material;
(4) uniformly mixing the powder obtained in the step (2) and the powder obtained in the step (3), and then uniformly mixing the powder with a coupling agent and aromatic oil to obtain the composite material;
further, in the step (1), the drying temperature is 100-;
further, in the step (2), the crushing method comprises the following steps: ball-milling for 20-40min, and grinding to the particle size required by the filler in technical Specification for road asphalt pavement construction (JTG F40-2004);
further, in the step (2), the drying temperature is 100-;
further, in the step (3), the powder is mixed uniformly and then mixed with the coupling agent for 10-40 min.
4. An anti-aging asphalt mixture is characterized in that: the raw materials comprise the following components in parts by weight: 40-80 parts of coarse aggregate, 10-60 parts of fine aggregate, 3-6 parts of asphalt and 1-5 parts of filler, wherein the asphalt accounts for 97-98% by mass percent, and the composite modified red mud-based asphalt anti-aging agent of claim 1 or 2 accounts for 2-3% by mass percent;
further, the asphalt mix types include: any one of AC13, AC20, AC25, SMA 13;
further, the coarse aggregate comprises any one of limestone, basalt, diabase and granite, and meets the requirements of technical Specification for road asphalt pavement construction JTG F40-2004 on the coarse aggregate;
further, the asphalt comprises any one of 70# base asphalt and SBS modified asphalt, and meets the requirements of technical Specification for road asphalt pavement construction JTG F40-2004 on asphalt.
5. The anti-aging asphalt mixture according to claim 4, wherein: the filler is limestone mineral powder, and meets the requirements of technical Specification for Highway asphalt pavement construction JTG F40-2004 on the filler.
6. The method for preparing the anti-aging asphalt mixture according to claim 4 or 5, characterized in that: the method comprises the following steps:
(i) heating and melting asphalt, then proportionally mixing the asphalt with the composite modified red mud-based asphalt anti-aging agent, and uniformly mixing to obtain anti-aging modified asphalt;
(ii) respectively heating the coarse aggregate, the fine aggregate and the filler, then uniformly mixing the coarse aggregate and the fine aggregate according to a proportion, and adding the anti-aging modified asphalt obtained in the step (i) to obtain a pre-mixture;
(iii) and (3) adding the filler into the mixture obtained in the step (ii) in proportion, and uniformly mixing to obtain the composite material.
7. The method according to claim 6, wherein in the step (i), the heating conditions are: heating at 130-170 ℃ for 1-3 h.
8. The method according to claim 6, wherein in the step (ii), the heating conditions are: heating at 160-180 ℃ for 1-5 h.
9. The composite modified red mud-based asphalt anti-aging agent of claim 1 or 2 and/or the composite modified red mud-based asphalt anti-aging agent prepared by the method of claim 3 are applied to the fields of road and bridge engineering.
10. Use of the anti-aging asphalt mixture of claim 4 or 5 and/or the anti-aging asphalt mixture prepared by the method of claim 6 in the field of road and bridge engineering.
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