CN114988763B - Method for improving water stability of asphalt mixture by compounding coal tar pitch and red mud - Google Patents
Method for improving water stability of asphalt mixture by compounding coal tar pitch and red mud Download PDFInfo
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- CN114988763B CN114988763B CN202210618997.1A CN202210618997A CN114988763B CN 114988763 B CN114988763 B CN 114988763B CN 202210618997 A CN202210618997 A CN 202210618997A CN 114988763 B CN114988763 B CN 114988763B
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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
- C04B18/0409—Waste from the purification of bauxite, e.g. red mud
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/36—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
- 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
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- 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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- 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 the technical field of road engineering construction, and provides a method for improving the water stability of an asphalt mixture by compounding coal pitch and red mud, which comprises the steps of preparing a coal pitch and red mud compound modifier; the coal tar and red mud composite modifier is prepared from the following raw materials: 60-70 parts of coal tar pitch, 20-30 parts of red mud, 5-10 parts of composite additive, 1-5 parts of anti-aging agent and 2-5 parts of coupling agent solution; also comprises the preparation of modified asphalt mixture; the modified asphalt mixture is prepared from the following raw materials: 88-94 parts of aggregate, 2-5 parts of mineral powder, 2-4 parts of petroleum asphalt and 3-6 parts of coal asphalt and red mud composite modifier prepared in the step S1. The water stability of the asphalt mixture prepared by the invention is obviously improved, the road performance of the asphalt mixture is effectively ensured, and the solid waste resources can be fully utilized, so that the resources are saved, and the environment is protected.
Description
Technical Field
The invention relates to the technical field of road engineering construction, in particular to a method for improving the water stability of an asphalt mixture by compounding coal pitch and red mud.
Background
The coal tar pitch is the residue after the liquid fraction is removed by distillation in the process of processing the coal tar, is the main component of the coal tar, and accounts for 50 to 60 percent of the total amount. The coal tar pitch contains more polar functional groups (O, N and S structures), the structures are easy to adhere to stone materials and have better wetting and adhesion properties, and the aromatic structures in the coal can poison microorganisms, so that the coal tar pitch has a certain antimicrobial corrosion effect and prolongs the pavement performance. However, the coal pitch has strong temperature sensitivity, high temperature and easy flowing, low temperature and easy brittle fracture, poor ductility, easy aging, easy environmental pollution and the like, and is limited in application.
Red mud is an industrial solid waste discharged when alumina is extracted in the aluminum industry, and is called red mud because it contains a large amount of iron oxide and is red or brown. 1.0 to 1.8 tons of red mud is discharged when 1 ton of alumina is produced. As a large alumina producing country in China, red mud is discharged annually up to millions of tons. With the increasing stock quantity of the red mud and the increasing pollution to the environment, the resource utilization of the red mud to the maximum extent is reluctant.
Disclosure of Invention
Aiming at the problems, the invention provides a method for improving the water stability of an asphalt mixture by compounding coal pitch and red mud.
The invention provides a coal tar and red mud composite modifier, which comprises the following components in percentage by mass: 60-70 parts of coal tar pitch, 20-30 parts of red mud, 5-10 parts of composite additive, 1-5 parts of anti-aging agent and 2-5 parts of coupling agent solution.
The coal pitch is medium temperature coal pitch. The red mud is one or more of sintering process red mud, bayer process red mud and combination process red mud.
The composite additive comprises the following components in parts by mass: 40-60 parts of resin additives and 40-60 parts of rubber additives.
The resin additive is one or more of polyethylene, polyvinyl chloride and furan resin; the rubber additive is one or more of rubber powder, waste rubber particles and natural rubber.
The anti-aging agent is one or more of phenyl-alpha-naphthylamine, N-phenyl-N' -isopropyl-p-phenylenediamine and 2, 4-trimethyl-1, 2-dihydroquinoline polymer.
The coupling agent solution comprises the following components in parts by mass: 15-25 parts of coupling agent, 5-10 parts of water and 70-80 parts of alcohol.
The coupling agent is a silane coupling agent 550 and a silane coupling agent 560. The alcohol is one of ethanol and methanol.
The second and the invention provides a preparation method of a coal tar pitch and red mud composite modifier, which comprises the following steps:
(1) Placing the finely ground red mud into a solid stirrer, adding a coupling agent solution, spraying the coupling agent solution on the red mud, and stirring at the rotating speed of 1000-2000 rpm for 40-60 min; then drying and grinding the mixture to the particle size required by the filler in the technical Specification for highway asphalt pavement construction for later use;
(2) Crushing coal tar pitch, sieving with a 80-mesh sieve, placing in high-speed shearing equipment, heating to 150-160 ℃, adding an anti-aging agent, and stirring at the rotation speed of 4000-8000 rpm for 20-120 min; adding the composite additive, and stirring at the rotating speed of 1000-3000 rpm for 20-30 min; and (2) adding a small amount of the red mud treated in the step (1) for multiple times, and stirring at the rotating speed of 1000-3000 rpm for 20-30 min to obtain the coal tar and red mud composite modifier.
The invention provides a modified asphalt mixture, which comprises the following components in percentage by mass: 88 to 94 portions of aggregate, 2 to 5 portions of mineral powder, 2 to 4 portions of petroleum asphalt and 3 to 6 portions of the modifier.
The asphalt mixture is any one of AC13, AC20, AC25 and SMA13 in type, the aggregate is any one of limestone and basalt, and the mineral powder is any one of limestone mineral powder and basalt mineral powder. The petroleum asphalt is road petroleum asphalt meeting the requirements of technical Specifications for road asphalt pavement construction (JTG F40-2004).
The invention provides a preparation method of a modified asphalt mixture, which comprises the following steps:
step one, drying and preheating aggregate and mineral powder;
step two, heating and melting the petroleum asphalt and the modifier prepared in the step S1 for later use;
thirdly, stirring the modifier for 20-30 min at the rotating speed of 2000-3000 rpm by using high-speed shearing equipment at the temperature of 145-165 ℃;
step four, preheating an asphalt mixture mixer to 160-180 ℃, adding the preheated aggregate, stirring for 1-2 min at 160-180 ℃, adding the preheated petroleum asphalt and the modifier, and stirring for 1-2 min; adding preheated mineral powder, and stirring for 1-2 min to obtain the modified asphalt mixture.
Preferably, the preheating conditions of the aggregate and the mineral powder are as follows: heating for 1-3h at 160-170 ℃.
Preferably, the preheating conditions of the modifier are: heating for 1-3h at 145-165 ℃ until the mixture is melted.
The invention achieves the following beneficial effects:
firstly, the modifier prepared by compounding coal asphalt and red mud is added into the asphalt mixture, so that the water stability of the asphalt mixture can be effectively improved, and various road performances of the asphalt mixture can be ensured;
secondly, the modifier prepared by the invention is prepared by utilizing coal pitch and red mud, effectively promotes the utilization of solid waste resources, and contributes to protecting the environment and saving resources.
Detailed Description
To facilitate an understanding of the invention for those skilled in the art, the following description sets forth a specific embodiment of the invention.
The invention aims to improve the water stability of an asphalt mixture by compounding coal asphalt and red mud, and provides a method for improving the water stability of the asphalt mixture by compounding the coal asphalt and the red mud.
The technical scheme of the invention is to provide a coal pitch and red mud composite modifier, and the modifier is added into an asphalt mixture to improve the water stability.
Specifically, the method comprises the following steps: the modifier of the invention comprises: 60-70 parts of coal tar pitch, 20-30 parts of red mud, 5-10 parts of composite additive, 1-5 parts of anti-aging agent and 2-5 parts of coupling agent solution. The composite additive comprises the following components in percentage by mass: resin additive: rubber additive =40 to 60:40 to 60; the coupling agent solution comprises the following components in percentage by mass: 15-25 parts of coupling agent, 5-10 parts of water and 70-80 parts of alcohol; the asphalt mixture comprises the following components in parts by weight: 88 to 94 portions of aggregate, 2 to 5 portions of mineral powder, 2 to 4 portions of petroleum asphalt and 3 to 6 portions of the modifier.
The preparation method of the coal tar pitch and red mud composite modifier comprises the following specific implementation steps:
(1) Putting 20-30 parts of ground red mud into a solid stirrer, adding 2-5 parts of coupling agent solution, spraying the solution on the red mud, and stirring at the rotating speed of 1000-2000 rpm for 40-60 min; then drying and grinding the mixture to the particle size required by the filler in the technical Specification for highway asphalt pavement construction for later use;
(2) Crushing coal pitch, sieving with a 80-mesh sieve, placing the crushed coal pitch in high-speed shearing equipment, heating to 150-160 ℃, adding 1-5 parts of anti-aging agent, and stirring at the rotation speed of 4000-8000 rpm for 20-120 min; adding 5-10 parts of composite additive, stirring at the rotation speed of 1000-3000 rpm for 20-30 min; and adding a small amount of 20-30 parts of red mud for multiple times, and stirring at the rotating speed of 1000-3000 rpm for 20-30 min to obtain the coal tar and red mud composite modifier.
The preparation method of the asphalt mixture comprises the following specific implementation steps:
(1) Drying the aggregate and the mineral powder and heating for 1-3h at 160-170 ℃; heating the modifier and the asphalt at 145-165 ℃ for 1-3h until the modifier and the asphalt are melted for later use;
(2) The modifier is stirred for 20-30 min at the rotating speed of 2000-3000 rpm under the condition of 145-165 ℃ by using high-speed shearing equipment.
(3) Preheating an asphalt mixture mixer to 160-180 ℃, adding 88-94 parts of aggregate, stirring for 1-2 min at 160-180 ℃, adding 2-4 parts of preheated asphalt and 3-6 parts of modifier, and stirring for 1-2 min; adding 2-5 parts of preheated mineral powder, and stirring for 1-2 min to obtain the asphalt mixture.
In order to better understand the present invention and fully illustrate the beneficial effects of the present invention in improving the water stability of asphalt mixtures, the contents of the present invention will be further illustrated with reference to the following examples and comparative examples, but the contents of the present invention are not limited to only the following examples.
Example 1
The modifier of the invention comprises: 65 parts of coal tar pitch, 25 parts of sintering red mud, 5 parts of a composite additive, 2 parts of phenyl-alpha-naphthylamine and 3 parts of a coupling agent solution. The composite additive comprises the following components in percentage by mass: polyethylene: waste rubber particles =50:50; the coupling agent solution comprises the following components in percentage by mass: silane coupling agent 550: water: ethanol =20:8:72. the asphalt mixture comprises the following components in parts by mass: 90 parts of limestone aggregate, 4 parts of basalt mineral powder, 2 parts of No. 70 matrix asphalt and 4 parts of the modifier.
The modifier in this example was prepared as follows:
(1) Placing the finely ground sintering method red mud into a solid stirrer, adding a coupling agent solution, spraying the coupling agent solution on the red mud, and stirring at the rotating speed of 2000rpm for 60min; then placing the mixture in a drying oven for drying at 105 ℃ and grinding the mixture to the particle size required by the filler in the technical Specification for construction of road asphalt pavement for later use;
(2) Crushing coal tar pitch, sieving with 80 mesh sieve, heating in high speed shearing equipment to 160 deg.C, adding phenyl-alpha-naphthylamine, and stirring at 6000rpm for 60min; adding the composite additive, and stirring at the rotating speed of 2500rpm for 30min; and (2) adding a small amount of the red mud treated in the step (1) for multiple times, and stirring at the rotating speed of 3000rpm for 30min to obtain the coal tar and red mud composite modifier.
The preparation method of the asphalt mixture in this example is as follows:
(1) Drying the aggregate and the mineral powder and heating for 2 hours at 160 ℃; heating the modifier and the asphalt at 155 ℃ for 2h until the modifier and the asphalt are melted for later use;
(2) The modifier is stirred for 30min at 155 ℃ and 3000rpm by using high-speed shearing equipment.
(3) Preheating an asphalt mixture mixer to 160 ℃, adding limestone aggregate, stirring for 2min at 160 ℃, adding preheated 70# matrix asphalt and the modifier of the invention, and stirring for 2min; adding preheated basalt mineral powder, and stirring for 2min to obtain asphalt mixture.
Example 2
The modifier of the invention comprises: 60 parts of coal tar pitch, 28 parts of sintering red mud, 6 parts of a composite additive, 3 parts of phenyl-alpha-naphthylamine and 3 parts of a coupling agent solution. The composite additive comprises the following components in percentage by mass: polyethylene: waste rubber particles =40:60, adding a solvent to the mixture; the coupling agent solution comprises the following components in percentage by mass: silane coupling agent 550: water: ethanol =20:8:72. the asphalt mixture comprises the following components in parts by weight: 90 parts of limestone aggregate, 4 parts of basalt mineral powder, 2 parts of No. 70 matrix asphalt and 4 parts of the modifier.
The modifier in this example was prepared as follows:
(1) Putting 25 parts of the ground sintering-process red mud into a solid stirrer, adding 3 parts of a coupling agent solution, spraying the solution on the red mud, and stirring at 2000rpm for 60min; then placing the mixture in a drying oven for drying at 105 ℃ and grinding the mixture to the particle size required by the filler in the technical Specification for construction of road asphalt pavement for later use;
(2) Crushing coal tar pitch, sieving with a 80-mesh sieve, placing in a high-speed shearing device, heating to 160 ℃, adding phenyl-alpha-naphthylamine, and stirring at 6000rpm for 60min; adding the composite additive, and stirring at the rotating speed of 2500rpm for 30min; and (2) adding a small amount of the red mud treated in the step (1) for multiple times, and stirring at the rotating speed of 3000rpm for 30min to obtain the coal tar and red mud composite modifier.
The preparation method of the asphalt mixture in this example is as follows:
(1) Drying the aggregate and the mineral powder and heating for 2 hours at 160 ℃; heating the modifier and the asphalt at 155 ℃ for 2h until the modifier and the asphalt are melted for later use;
(2) The modifier is stirred for 30min at 155 ℃ and 3000rpm by using a high-speed shearing device.
(3) Preheating an asphalt mixture mixer to 160 ℃, adding limestone aggregate, stirring for 2min at 160 ℃, adding preheated 70# matrix asphalt and a modifier, and stirring for 2min; adding preheated basalt mineral powder, and stirring for 2min to obtain asphalt mixture.
Example 3
The modifier of the invention comprises: 65 parts of coal tar pitch, 25 parts of sintering red mud, 5 parts of a composite additive, 2 parts of N-phenyl-N' -isopropyl-p-phenylenediamine and 3 parts of a coupling agent solution. The composite additive comprises the following components in percentage by mass: polyvinyl chloride: waste rubber particles =50:50; the coupling agent solution comprises the following components in percentage by mass: silane coupling agent 560: water: methanol =20:8:72. the asphalt mixture comprises the following components in parts by mass: 90 parts of limestone aggregate, 4 parts of basalt mineral powder, 2 parts of No. 70 matrix asphalt and 4 parts of the modifier.
The modifier in this example was prepared as follows:
(1) Placing the finely ground sintering method red mud into a solid stirrer, adding a coupling agent solution, spraying the coupling agent solution on the red mud, and stirring at the rotating speed of 2000rpm for 60min; then placing the mixture in a drying oven for drying at 105 ℃ and grinding the mixture to the particle size required by the filler in the technical Specification for construction of highway asphalt pavement for later use;
(2) Crushing coal tar pitch, sieving with 80 mesh sieve, heating in high speed shearing equipment to 160 deg.C, adding N-phenyl-N' -isopropyl-p-phenylenediamine, and stirring at 6000rpm for 60min; adding the composite additive, and stirring for 30min at the rotating speed of 2500 rpm; and (2) adding a small amount of the red mud treated in the step (1) for multiple times, and stirring at the rotating speed of 3000rpm for 30min to obtain the coal tar and red mud composite modifier.
The preparation method of the asphalt mixture in this example is as follows:
(1) Drying the aggregate and the mineral powder and heating for 2 hours at 160 ℃; heating the modifier and the asphalt at 155 ℃ for 2h until the modifier and the asphalt are melted for later use;
(2) The modifier is stirred for 30min at 155 ℃ and 3000rpm by using a high-speed shearing device.
(3) Preheating an asphalt mixture mixer to 160 ℃, adding limestone aggregate, stirring for 2min at 160 ℃, adding preheated 70# matrix asphalt and the modifier of the invention, and stirring for 2min; adding preheated basalt mineral powder, and stirring for 2min to obtain an asphalt mixture.
Example 4
The modifier of the invention comprises: 64 parts of coal tar pitch, 22 parts of sintering red mud, 8 parts of a composite additive, 3 parts of phenyl-alpha-naphthylamine and 3 parts of a coupling agent solution. The composite additive comprises the following components in percentage by mass: furan resin: waste rubber particles =50:50; the coupling agent solution comprises the following components in percentage by mass: silane coupling agent 550: water: ethanol =18: 10:72. the asphalt mixture comprises the following components in parts by mass: 88 parts of limestone aggregate, 3 parts of basalt mineral powder, 3 parts of No. 70 matrix asphalt and 6 parts of the modifier.
The modifier in this example was prepared as follows:
(1) Placing the ground sintering red mud into a solid stirrer, adding a coupling agent solution, spraying the coupling agent solution on the red mud, and stirring at 2000rpm for 60min; then placing the mixture in a drying oven for drying at 105 ℃ and grinding the mixture to the particle size required by the filler in the technical Specification for construction of highway asphalt pavement for later use;
(2) Crushing coal tar pitch, sieving with 80 mesh sieve, heating in high speed shearing equipment to 160 deg.C, adding phenyl-alpha-naphthylamine, and stirring at 6000rpm for 60min; adding the composite additive, and stirring at the rotating speed of 2500rpm for 30min; and (2) adding a small amount of the red mud treated in the step (1) for multiple times, and stirring at the rotating speed of 3000rpm for 30min to obtain the coal tar and red mud composite modifier.
The preparation method of the asphalt mixture in this example is as follows:
(1) Drying the aggregate and the mineral powder and heating for 2 hours at 160 ℃; heating the modifier and the asphalt at 155 ℃ for 2h until the modifier and the asphalt are melted for later use;
(2) The modifier is stirred for 30min at 155 ℃ and 3000rpm by using a high-speed shearing device.
(3) Preheating an asphalt mixture mixer to 160 ℃, adding limestone aggregate, stirring for 2min at 160 ℃, adding preheated 70# matrix asphalt and the modifier of the invention, and stirring for 2min; adding preheated basalt mineral powder, and stirring for 2min to obtain an asphalt mixture.
Example 5
The modifier of the invention comprises: 65 parts of coal tar pitch, 25 parts of sintering red mud, 5 parts of a composite additive, 2 parts of phenyl-alpha-naphthylamine and 3 parts of a coupling agent solution. The composite additive comprises the following components in percentage by mass: polyethylene: waste rubber particles =50:50; the coupling agent solution comprises the following components in percentage by mass: silane coupling agent 550: water: ethanol =20:8:72. the asphalt mixture comprises the following components in parts by mass: 90 parts of limestone aggregate, 4 parts of basalt mineral powder, 2 parts of No. 70 matrix asphalt and 4 parts of the modifier.
The modifier in this example was prepared as follows:
(1) Placing the ground sintering red mud into a solid stirrer, adding a coupling agent solution, spraying the coupling agent solution on the red mud, and stirring at 2000rpm for 50min; then placing the mixture in a drying oven for drying at 105 ℃ and grinding the mixture to the particle size required by the filler in the technical Specification for construction of highway asphalt pavement for later use;
(2) Crushing coal tar pitch, sieving with 80 mesh sieve, heating in high speed shearing equipment to 155 deg.c, adding phenyl-alpha-naphthylamine, and stirring at 4000rpm for 80min; adding the composite additive, and stirring at the rotating speed of 3000rpm for 20min; and (2) adding a small amount of the red mud treated in the step (1) for multiple times, and stirring at the rotating speed of 2000rpm for 25min to obtain the coal tar and red mud composite modifier.
The preparation method of the asphalt mixture in this example is as follows:
(1) Drying the aggregate and the mineral powder and heating for 2 hours at 160 ℃; heating the modifier and the asphalt at 155 ℃ for 2h until the modifier and the asphalt are melted for later use;
(2) The modifier is stirred for 30min at 155 ℃ and 3000rpm by using a high-speed shearing device.
(3) Preheating an asphalt mixture mixer to 160 ℃, adding limestone aggregate, stirring for 2min at 160 ℃, adding preheated 70# matrix asphalt and the modifier of the invention, and stirring for 2min; adding basalt mineral powder, and stirring for 2min to obtain asphalt mixture.
Example 6
The modifier of the invention comprises: 65 parts of coal tar pitch, 25 parts of sintering red mud, 5 parts of a composite additive, 2 parts of phenyl-alpha-naphthylamine and 3 parts of a coupling agent solution. The composite additive comprises the following components in percentage by mass: polyethylene: waste rubber particles =50:50; the coupling agent solution comprises the following components in percentage by mass: silane coupling agent 550: water: ethanol =20:8:72. the asphalt mixture comprises the following components in parts by weight: 90 parts of limestone aggregate, 4 parts of basalt mineral powder, 2 parts of No. 70 matrix asphalt and 4 parts of the modifier.
The modifier in this example was prepared as follows:
(1) Placing the ground sintering red mud into a solid stirrer, adding a coupling agent solution, spraying the coupling agent solution on the red mud, and stirring at 2000rpm for 60min; then placing the mixture in a drying oven for drying at 105 ℃ and grinding the mixture to the particle size required by the filler in the technical Specification for construction of highway asphalt pavement for later use;
(2) Crushing coal tar pitch, sieving with 80 mesh sieve, heating in high speed shearing equipment to 160 deg.c, adding phenyl-alpha-naphthylamine, and stirring at 6000rpm for 60min; adding the composite additive, and stirring at the rotating speed of 2500rpm for 30min; and (2) adding a small amount of the red mud treated in the step (1) for multiple times, and stirring at the rotating speed of 3000rpm for 30min to obtain the coal tar and red mud composite modifier.
The preparation method of the asphalt mixture in this example is as follows:
(1) Drying the aggregate and the mineral powder and heating for 1.5h at 170 ℃; heating the modifier and the asphalt at 165 ℃ for 2 hours until the modifier and the asphalt are melted for later use;
(2) The modifier is stirred for 20min at 165 ℃ and 2000rpm by using a high-speed shearing device.
(3) Preheating an asphalt mixture mixing machine to 180 ℃, adding limestone aggregate, stirring for 1min at 180 ℃, adding preheated 70# matrix asphalt and the modifier of the invention, and stirring for 1min; adding preheated basalt mineral powder, and stirring for 1min to obtain asphalt mixture.
Comparative example 1
1. The preparation method of the coal tar and red mud composite modifier is different from the first embodiment in that coal tar is not added;
2. a modified asphalt mixture was prepared as in the first example except that the modifier used was prepared for this comparative example.
Comparative example 2
1. The preparation of the coal tar pitch and red mud composite modifier is different from the first embodiment in that no red mud is added;
2. a modified asphalt mixture was prepared, which is different from the first example in that the modifier used was prepared for this comparative example.
Comparative example 3
1. The preparation of the coal tar pitch and red mud composite modifier is the same as the first embodiment except that the composite additive is not added.
2. A modified asphalt mixture was prepared, which is different from the first example in that the modifier used was prepared for this comparative example.
Comparative example 4
1. The preparation of the coal tar pitch and red mud composite modifier is different from the first embodiment in that the coal tar pitch, the phenyl-alpha-naphthylamine, the composite additive and the red mud are added into high-speed shearing equipment according to a certain proportion, and the mixture is stirred for 60min at a rotating speed of 3000 rpm.
2. A modified asphalt mixture was prepared, which is different from the first example in that the modifier used was prepared for this comparative example.
Comparative example 5
1. The preparation of the coal tar pitch and red mud composite modifier is the same as that of the first embodiment.
2. A modified asphalt mixture was prepared as described in the first example, except that the modifier was not subjected to high-speed shearing.
The asphalt mixtures of 6 examples and 5 comparative examples were evaluated for high-temperature stability, low-temperature crack resistance and water stability by referring to the test flow of road engineering asphalt and asphalt mixture test procedures (JTG E20-2011), and specific evaluation indexes are shown in table 1.
TABLE 1
As can be seen from the test results of the asphalt mixtures, compared to the test results of comparative examples 1 to 5,
(1) The dynamic stability of the asphalt mixture prepared by the method provided by the invention is improved, which shows that the method can improve the high-temperature permanent deformation resistance of the asphalt mixture;
(2) The bending strain of the asphalt mixture prepared by the method provided by the invention is increased, which shows that the method provided by the invention can effectively improve the low-temperature crack resistance of the asphalt mixture;
(3) The water immersion residue stability and the freeze-thaw splitting strength of the asphalt mixture prepared by the method provided by the invention are obviously increased, which shows that the method provided by the invention can obviously improve the water stability of the asphalt mixture.
The above embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A method for improving water stability of an asphalt mixture by compounding coal tar pitch and red mud is characterized by comprising the following steps:
s1: preparing a coal tar and red mud composite modifier;
the coal tar and red mud composite modifier is prepared from the following raw materials in parts by mass: 60-70 parts of coal tar pitch, 20-30 parts of red mud, 5-10 parts of composite additive, 1-5 parts of anti-aging agent and 2-5 parts of coupling agent solution;
s2: preparing a modified asphalt mixture;
the modified asphalt mixture is prepared from the following raw materials in parts by mass: 88 to 94 portions of aggregate, 2 to 5 portions of mineral powder, 2 to 4 portions of petroleum asphalt and 3 to 6 portions of coal asphalt and red mud composite modifier prepared in the step S1.
2. The method for improving the water stability of the asphalt mixture by compounding the coal tar pitch and the red mud according to claim 1, which is characterized by comprising the following steps:
in the step S1, the composite additive comprises the following components in parts by mass: 40-60 parts of resin additives and 40-60 parts of rubber additives.
3. The method for improving the water stability of the asphalt mixture by compounding the coal tar pitch and the red mud according to claim 2, which is characterized by comprising the following steps:
the resin additive is one or more of polyethylene, polyvinyl chloride and furan resin; the rubber additive is one or more of rubber powder, waste rubber particles and natural rubber.
4. The method for improving the water stability of the asphalt mixture by compounding the coal tar pitch and the red mud according to claim 1, which is characterized by comprising the following steps:
the anti-aging agent is one or more of phenyl-alpha-naphthylamine, N-phenyl-N' -isopropyl-p-phenylenediamine and 2, 4-trimethyl-1, 2-dihydroquinoline polymer.
5. The method for improving the water stability of the asphalt mixture by compounding the coal tar pitch and the red mud according to claim 1, which is characterized by comprising the following steps: the coupling agent solution comprises the following components in parts by mass: 15-25 parts of coupling agent, 5-10 parts of water and 70-80 parts of alcohol; the coupling agents are a silane coupling agent 550 and a silane coupling agent 560; the alcohol is one of ethanol and methanol.
6. The method for improving the water stability of the asphalt mixture by compounding the coal tar pitch and the red mud according to claim 1, wherein the specific process of the step S1 comprises the following steps:
step A, putting the ground red mud into a solid stirrer, adding a coupling agent solution, spraying the coupling agent solution on the red mud, stirring at the rotating speed of 1000-2000 rpm for 40-60 min, and drying and grinding for later use;
b, crushing the coal tar pitch, sieving the crushed coal tar pitch with a 80-mesh sieve, placing the crushed coal tar pitch in high-speed shearing equipment, heating the crushed coal tar pitch to 150-160 ℃, adding an anti-aging agent, and stirring the mixture for 20-120 min at the rotating speed of 4000-8000 rpm; adding the composite additive, and stirring at the rotation speed of 1000-3000 rpm for 20-30 min; and (3) adding a small amount of the red mud treated in the step one for multiple times, and stirring at the rotating speed of 1000-3000 rpm for 20-30 min to obtain the coal tar and red mud composite modifier.
7. The method for improving the water stability of the asphalt mixture by compounding the coal tar pitch and the red mud according to claim 1, which is characterized by comprising the following steps:
in the step S2, the aggregate is any one of limestone and basalt; the mineral powder is any one of limestone mineral powder and basalt mineral powder.
8. The method for improving the water stability of the asphalt mixture by compounding the coal tar pitch and the red mud according to claim 1, wherein the specific process of the step S2 comprises the following steps:
step one, drying and preheating aggregate and mineral powder;
step two, heating and melting the petroleum asphalt and the modifier prepared in the step S1 for later use;
thirdly, stirring the modifier for 20-30 min at the rotating speed of 2000-3000 rpm by using high-speed shearing equipment at the temperature of 145-165 ℃;
step four, preheating an asphalt mixture mixer to 160-180 ℃, adding the preheated aggregate, stirring for 1-2 min at 160-180 ℃, adding the preheated petroleum asphalt and the modifier, and stirring for 1-2 min; adding preheated mineral powder, and stirring for 1-2 min to obtain the modified asphalt mixture.
9. The method for improving the water stability of the asphalt mixture by compounding the coal tar pitch and the red mud according to claim 1, wherein the preheating conditions of the aggregate and the mineral powder are as follows: heating for 1-3h at 160-170 ℃.
10. The method for improving the water stability of the asphalt mixture by compounding the coal tar pitch and the red mud according to claim 1, wherein the preheating conditions of the modifier are as follows: heating for 1-3h at 145-165 ℃ until the mixture is melted.
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| CN101792605A (en) * | 2010-02-24 | 2010-08-04 | 云南先锋煤业开发有限公司 | Composite asphalt modifier for CDE (Common Desktop Environment) and preparation method thereof |
| KR101187823B1 (en) * | 2012-02-24 | 2012-10-08 | (주) 영흥산업환경 | Composition of eco-road pavement |
| CN104556889A (en) * | 2013-10-22 | 2015-04-29 | 中国石油化工股份有限公司 | Anti-rutting asphalt mixture and preparation method thereof |
| CN109369048A (en) * | 2018-12-26 | 2019-02-22 | 山东大学 | A kind of asphalt and preparation method thereof of chemical modification red mud substitution miberal powder |
| CN111499247A (en) * | 2020-04-24 | 2020-08-07 | 山东大学 | Red mud-silicate composite anti-aging agent, asphalt mixture and preparation method and application thereof |
| CN114538821A (en) * | 2022-01-11 | 2022-05-27 | 山东大学 | Composite modified red mud-based asphalt anti-aging agent, preparation method and application |
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| CN101792605A (en) * | 2010-02-24 | 2010-08-04 | 云南先锋煤业开发有限公司 | Composite asphalt modifier for CDE (Common Desktop Environment) and preparation method thereof |
| KR101187823B1 (en) * | 2012-02-24 | 2012-10-08 | (주) 영흥산업환경 | Composition of eco-road pavement |
| CN104556889A (en) * | 2013-10-22 | 2015-04-29 | 中国石油化工股份有限公司 | Anti-rutting asphalt mixture and preparation method thereof |
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