CN116621507B - Recycled asphalt concrete and preparation method thereof - Google Patents
Recycled asphalt concrete and preparation method thereof Download PDFInfo
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- CN116621507B CN116621507B CN202310610577.3A CN202310610577A CN116621507B CN 116621507 B CN116621507 B CN 116621507B CN 202310610577 A CN202310610577 A CN 202310610577A CN 116621507 B CN116621507 B CN 116621507B
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- 239000011384 asphalt concrete Substances 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 81
- 239000004113 Sepiolite Substances 0.000 claims abstract description 76
- 229910052624 sepiolite Inorganic materials 0.000 claims abstract description 76
- 235000019355 sepiolite Nutrition 0.000 claims abstract description 76
- 239000010426 asphalt Substances 0.000 claims abstract description 62
- 239000000203 mixture Substances 0.000 claims abstract description 47
- 239000002699 waste material Substances 0.000 claims abstract description 43
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 40
- 239000011707 mineral Substances 0.000 claims abstract description 40
- 239000007822 coupling agent Substances 0.000 claims abstract description 39
- 239000012492 regenerant Substances 0.000 claims abstract description 30
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 20
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 20
- 239000000718 radiation-protective agent Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 claims abstract description 15
- 229910021538 borax Inorganic materials 0.000 claims abstract description 13
- 229920005551 calcium lignosulfonate Polymers 0.000 claims abstract description 13
- 239000004328 sodium tetraborate Substances 0.000 claims abstract description 13
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 13
- ALVYUZIFSCKIFP-UHFFFAOYSA-N triethoxy(2-methylpropyl)silane Chemical compound CCO[Si](CC(C)C)(OCC)OCC ALVYUZIFSCKIFP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910001570 bauxite Inorganic materials 0.000 claims description 52
- 238000003756 stirring Methods 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 28
- 239000002245 particle Substances 0.000 claims description 27
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 claims description 26
- 239000002994 raw material Substances 0.000 claims description 20
- 229940075507 glyceryl monostearate Drugs 0.000 claims description 13
- 239000001788 mono and diglycerides of fatty acids Substances 0.000 claims description 13
- 239000010705 motor oil Substances 0.000 claims description 13
- 239000003208 petroleum Substances 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 10
- 208000028659 discharge Diseases 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 9
- 150000002910 rare earth metals Chemical class 0.000 claims description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 8
- KTWOOEGAPBSYNW-UHFFFAOYSA-N ferrocene Chemical group [Fe+2].C=1C=C[CH-]C=1.C=1C=C[CH-]C=1 KTWOOEGAPBSYNW-UHFFFAOYSA-N 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 5
- 229920002367 Polyisobutene Polymers 0.000 claims description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 claims description 5
- 229910000396 dipotassium phosphate Inorganic materials 0.000 claims description 5
- 235000019797 dipotassium phosphate Nutrition 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 150000002191 fatty alcohols Chemical class 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- 238000002294 plasma sputter deposition Methods 0.000 claims description 5
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 5
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- WPMYUUITDBHVQZ-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoic acid Chemical compound CC(C)(C)C1=CC(CCC(O)=O)=CC(C(C)(C)C)=C1O WPMYUUITDBHVQZ-UHFFFAOYSA-N 0.000 claims description 3
- -1 pentaerythritol ester Chemical class 0.000 claims description 3
- 238000010257 thawing Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 7
- 239000004567 concrete Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 39
- 238000012360 testing method Methods 0.000 description 30
- 230000009467 reduction Effects 0.000 description 9
- 238000005452 bending Methods 0.000 description 7
- 238000003776 cleavage reaction Methods 0.000 description 6
- 230000007017 scission Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002557 mineral fiber Substances 0.000 description 2
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- C04B14/04—Silica-rich materials; Silicates
- C04B14/042—Magnesium silicates, e.g. talc, sepiolite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses recycled asphalt concrete and a preparation method thereof, and relates to the technical field of asphalt concrete, wherein the concrete comprises the following components: 12-24 parts of asphalt; 48-62 parts of waste asphalt mixture; 1-5 parts of borax; 2-6 parts of activated sepiolite mineral powder; 0.5-2 parts of calcium lignosulfonate; 0.1-0.5 part of isobutyl triethoxysilane; 3-10 parts of a regenerant; 0.5-1.5 parts of coupling agent; 0.3-1 part of antioxidant; 0.1-0.3 part of anti-radiation agent. The invention adopts the components of the waste asphalt mixture, the activated sepiolite powder, the new asphalt, the regenerant, the auxiliary materials and the like to be matched, so that the high-performance regenerated asphalt concrete is obtained, the problems of small dynamic stability, small freeze thawing splitting strength ratio and small damage strain of the regenerated asphalt in the prior art are effectively solved while the utilization rate of the waste asphalt mixture is considered, and the rutting resistance, the water stability and the crack resistance of the regenerated asphalt concrete are greatly improved.
Description
Technical Field
The invention relates to the technical field of asphalt concrete preparation, in particular to recycled asphalt concrete and a preparation method thereof.
Background
Asphalt concrete is obtained by mixing and compacting mineral mixture and asphalt binder, is one of the main materials of modern road pavement structures, is widely applied to various road pavements, and is particularly suitable for high-speed driving road pavements. The asphalt concrete pavement has the advantages of good mechanical property and road performance, smooth and seamless pavement, fine vibration reduction, comfortable driving, high traffic safety and the like, and the asphalt pavement can realize the regeneration of pavement materials, so that the asphalt concrete pavement is favored by wide designers and constructors in road construction. Asphalt concrete has the advantage of reducing pavement cracking, but in the road paving process, new asphalt concrete and old asphalt concrete are required to be combined, and due to poor combination property between the new asphalt concrete and the old asphalt concrete, the aging resistance and the durability of the regenerated asphalt concrete pavement are poor, so that the phenomenon that the asphalt concrete pavement is not used for a long time, and is in a pothole is generated, the service life is short, the maintenance cost is high, and the smoothness and the comfort of a road are greatly influenced.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a recycled asphalt concrete and a method for preparing the same, which aims to improve the performance and durability of the recycled asphalt concrete, and to achieve the above objects, the recycled asphalt concrete of the present invention comprises the following raw materials in parts by weight:
12-24 parts of asphalt;
48-62 parts of waste asphalt mixture;
1-5 parts of borax;
2-6 parts of activated sepiolite mineral powder;
0.5-2 parts of calcium lignosulfonate;
0.1-0.5 part of isobutyl triethoxysilane;
3-10 parts of a regenerant;
0.5-1.5 parts of coupling agent;
0.3-1 part of antioxidant;
0.1-0.3 part of anti-radiation agent.
Further, the waste asphalt mixture comprises the following components with different particle sizes:
1) Particle size of 15+ -7.5 mm, weight percentage of 30-40%;
2) Particle diameter is 8.5 plus or minus 6.5mm, and weight percentage is 30-40%;
3) The grain diameter is less than 2mm, and the weight percentage is 20-40%.
Preferably, the coupling agent is selected from one or more of rare earth coupling agent, titanate coupling agent 201.
Further, the coupling agent is a mixture of rare earth coupling agent and titanate coupling agent 201.
Further, the mass ratio of the rare earth coupling agent to the titanate coupling agent 201 is 1:1 or 1:0.5.
preferably, the antioxidant is selected from one or more of tri (2, 4-di-tert-butylphenyl) phosphite, n-stearyl β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate and pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ].
Preferably, the anti-radiation agent is preferably ferrocene.
Further, the preparation method of the activated sepiolite mineral powder specifically comprises the following steps: firstly grinding sepiolite slag into mineral powder with the particle size of 0.1-3 mm, adding potassium hydrogen phosphate with the weight of 0.15 times of that of the sepiolite mineral powder raw material into the sepiolite mineral powder raw material, dissolving the sepiolite mineral powder raw material into hot water with the temperature of 45-55 ℃ and uniformly mixing the sepiolite mineral powder raw material with the hot water; adding hydrogen peroxide with the concentration of 3.55.5%, uniformly mixing, putting into a reaction tank, reacting for 80-100min at the temperature of 60-70 ℃, taking out and draining; finally, carrying out plasma sputtering discharge treatment on the drained sepiolite powder, wherein the working parameters of the discharge treatment comprise: the accelerating voltage is set to 400500V, the magnetic field is set to 100-200G, the air pressure is set to 3-8mTorr, the current density is 30-50mA/cm, the power density is 20-40W/cm, and the treatment is completed.
Further, the regenerant comprises waste engine oil, C5 petroleum resin, modified bauxite and glyceryl monostearate according to the weight ratio of 1:0.5:0.2:0.05, and the preparation steps are as follows: weighing waste engine oil, C5 petroleum resin, bauxite and glyceryl monostearate according to the weight ratio, roasting the bauxite at 320-360 ℃ for 80-90min, soaking the bauxite in 10-20% hydrochloric acid solution for 60-80min, washing the bauxite with deionized water to be neutral, drying the bauxite for standby, adding fatty alcohol polyoxyethylene ether sodium sulfate which is equivalent to 2.5% of the weight of the bauxite, chlorinated paraffin-52 which is equivalent to 1.5% of the weight of the bauxite and polyisobutene which is equivalent to 3% of the weight of the bauxite, and fully and uniformly mixing the bauxite with the mixture through crushing and stirring to obtain modified bauxite powder with the particle size less than or equal to 0.3 mm; pouring the waste engine oil, the C5 petroleum resin, the glyceryl monostearate and the modified bauxite powder into a stirrer, and stirring and mixing for 2-3 hours at the temperature of 40-50 ℃ to obtain the modified bauxite powder.
Further, the preparation method of the recycled asphalt concrete comprises the following steps: weighing asphalt according to parts by weight, stirring uniformly in a stirrer at 150-170 ℃, pouring out and preserving heat for later use; pouring the waste asphalt mixture into a stirrer, and uniformly stirring at 130-150 ℃; adding asphalt, borax and activated sepiolite powder to be used into a stirrer, and fully mixing and stirring; finally, calcium lignosulfonate, isobutyl triethoxysilane, a regenerant, a coupling agent, an antioxidant and an anti-radiation agent are added, and stirring is continuously carried out for 2-3 hours at the temperature of 130-150 ℃ to obtain the modified calcium lignosulfonate.
The invention has the following beneficial effects:
(1) The regenerated asphalt concrete adopts the self-made activated modified filler and the regenerant, improves the compatibility of new asphalt and old asphalt, relieves the aging of waste asphalt mixture and regenerates the waste asphalt mixture, improves the bonding property and aging resistance of the finally prepared asphalt, reduces the pothole phenomenon of a pavement, prolongs the service life, reduces the maintenance cost, and greatly improves the smoothness and comfort of a road;
(2) The invention adopts the components of the waste asphalt mixture, the activated sepiolite powder, the new asphalt, the regenerant, the auxiliary materials and the like to be matched, so that the high-performance regenerated asphalt concrete is obtained, the problems of small dynamic stability, small freeze thawing splitting strength ratio and small damage strain of the regenerated asphalt in the prior art are effectively solved while the utilization rate of the waste asphalt mixture is considered, and the rutting resistance, the water stability and the crack resistance of the regenerated asphalt concrete are greatly improved;
(3) The activated sepiolite mineral powder is added into the formula of the regenerated asphalt concrete product, so that the regenerated asphalt concrete has strong adsorption and catalysis capabilities, can adsorb and catalyze the pollutant gas in urban air, and improves the environment.
Detailed Description
The following examples are provided to illustrate the technical aspects of the present invention more clearly, but are not intended to limit the scope of the present invention.
Example 1
The embodiment 1 discloses a recycled asphalt concrete which comprises the following raw materials in parts by weight:
12 parts of asphalt, 48 parts of waste asphalt mixture, 1 part of borax with the diameter of 2-4mm, 2 parts of activated sepiolite powder, 0.5 part of calcium lignosulfonate, 0.1 part of isobutyl triethoxysilane, 3 parts of regenerant, 0.5 part of coupling agent, 0.3 part of antioxidant and 0.1 part of anti-radiation agent.
Wherein, the different particle size composition ratios of the waste asphalt mixture are as follows in table 1:
TABLE 1
The coupling agent is rare earth coupling agent, the antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite ester, and the anti-radiation agent is ferrocene.
Example 2
The embodiment 2 discloses a recycled asphalt concrete which comprises the following raw materials in parts by weight:
15 parts of asphalt, 52 parts of waste asphalt mixture, 2 parts of borax with the diameter of 2-4mm, 3 parts of activated sepiolite powder, 0.8 part of calcium lignosulfonate, 0.2 part of isobutyl triethoxysilane, 5 parts of regenerant, 0.75 part of coupling agent, 0.5 part of antioxidant and 0.15 part of anti-radiation agent.
Wherein, the different particle size composition ratios of the waste asphalt mixture are as follows in table 2:
TABLE 2
| Sequence number | Particle size/mm | Weight percent/% |
| 1 | 15±7.5 | 35 |
| 2 | 8.5±6.5 | 35 |
| 3 | Less than 2 | 30 |
The coupling agent is titanate coupling agent 201, the antioxidant is beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-stearyl alcohol ester, and the anti-radiation agent is ferrocene.
Example 3
The embodiment 3 discloses a recycled asphalt concrete which comprises the following raw materials in parts by weight:
18 parts of asphalt, 55 parts of waste asphalt mixture, 3 parts of borax with the diameter of 2-4mm, 4 parts of activated sepiolite powder, 1.25 parts of calcium lignosulfonate, 0.3 part of isobutyltriethoxysilane, 7 parts of regenerant, 1 part of coupling agent, 0.6 part of antioxidant and 0.2 part of anti-radiation agent.
Wherein, the different particle size composition ratios of the waste asphalt mixture are as follows in table 3:
TABLE 3 Table 3
The coupling agent is prepared from rare earth coupling agent and titanate coupling agent 201 according to the mass ratio of 1:0.5, wherein the antioxidant is pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and the anti-radiation agent is ferrocene.
Example 4
The example 4 discloses a recycled asphalt concrete which comprises the following raw materials in parts by weight:
21 parts of asphalt, 60 parts of waste asphalt mixture, 4 parts of borax with the diameter of 2-4mm, 5 parts of activated sepiolite powder, 1.5 parts of calcium lignosulfonate, 0.4 part of isobutyl triethoxysilane, 8 parts of regenerant, 1.25 parts of coupling agent, 0.85 part of antioxidant and 0.25 part of anti-radiation agent.
Wherein, the different particle size composition ratios of the waste asphalt mixture are as follows in table 4:
TABLE 4 Table 4
| Sequence number | Particle size/mm | Weight percent/% |
| 1 | 15±7.5 | 40 |
| 2 | 8.5±6.5 | 40 |
| 3 | Less than 2 | 20 |
The coupling agent is prepared from rare earth coupling agent and titanate coupling agent 201 according to the mass ratio of 1:1, wherein the antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite and the anti-radiation agent is ferrocene.
Example 5
The example 5 discloses a recycled asphalt concrete which comprises the following raw materials in parts by weight:
24 parts of asphalt, 62 parts of waste asphalt mixture, 5 parts of borax with the diameter of 2-4mm, 6 parts of activated sepiolite powder, 2 parts of calcium lignosulfonate, 0.5 part of isobutyl triethoxysilane, 10 parts of regenerant, 1.5 parts of coupling agent, 1 part of antioxidant and 0.3 part of anti-radiation agent.
Wherein, the different particle size composition ratios of the waste asphalt mixture are as follows in table 5:
TABLE 5
The coupling agent is rare earth coupling agent, the antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite ester, and the anti-radiation agent is ferrocene.
The asphalt described in the above examples 1 to 5 is medium temperature asphalt powder produced by Hebei Fengtai energy science and technology Co., ltd, and the particle size is 0.5mm or less.
Example 6
This example 6 discloses a method for preparing activated sepiolite ore powder, which aims to process sepiolite slag into a recycled asphalt concrete system which can be applied to the invention by means of activation modification. In the development process of the product, if sepiolite slag or the sepiolite slag is crushed and directly applied to the recycled asphalt concrete formula system, the finally prepared product cannot obtain the expected technical effect, so that the sepiolite slag raw material is required to be activated and modified, impurities in the raw material components are removed, the internal structure of the sepiolite slag is improved, and the performance is improved. Unlike other minerals, sepiolite acts as a layered chain silicate mineral, in which two layers of silicon oxygen tetrahedra sandwich a layer of magnesium oxygen octahedra, forming 2: the lamellar structure unit of type 1, the tetrahedral layer of which is continuous, the sense of active oxygen in the layer being periodically reversed. The octahedral layer forms channels alternately arranged at the upper layer and the lower layer, the orientation of the channels is consistent with the fiber axis, and water molecules, metal cations, small organic molecules and the like are allowed to enter the channels, so that the sepiolite powder can be well mixed and compatible with other components in the system, and especially Si-0H in the structure of the sepiolite powder can directly react with organic matters to generate organic mineral derivatives, and the organic mineral derivatives are alternately layered and chain-shaped transition characteristics in structural units of the sepiolite powder. Moreover, sepiolite mineral powder also contains sepiolite mineral fiber as a main component, and the sepiolite mineral fiber has stable intrinsic structural performance and good durability, and has unexpected technical effects when being applied to concrete as a material fiber filling material, and is explained below through test examples.
The preparation method of the activated sepiolite mineral powder provided by the embodiment 6 of the invention specifically comprises the following steps:
firstly, grinding sepiolite slag into mineral powder with the particle size of 0.1mm, adding potassium hydrogen phosphate with the weight of 0.15 times of that of the mineral powder into sepiolite mineral powder raw material, dissolving the mixture in hot water at 45 ℃ and uniformly mixing the mixture; adding 3.5% hydrogen peroxide, mixing uniformly, placing into a reaction tank, reacting at 60 ℃ for 80min, taking out, and draining; finally, carrying out plasma sputtering discharge treatment on the drained sepiolite powder, wherein the working parameters of the discharge treatment comprise: the accelerating voltage is set to 400V, the magnetic field is set to 100G, the air pressure is set to 3mTorr, the current density is 30mA/cm, the power density is 20W/cm, and the activated sepiolite mineral powder is obtained after the treatment is completed.
The sepiolite slag is purchased from a sepiolite mineral powder factory in Hunan county, the performance of the sepiolite mineral powder after activation and modification is greatly improved, the sepiolite slag is completely applicable to the recycled asphalt concrete system of the embodiment of the invention, and the sepiolite mineral powder has the advantages of heat resistance, acid and alkali corrosion resistance, radiation resistance, insulation and stable performance, and in addition, the improved sepiolite mineral powder has good ion exchange and catalytic properties, has high specific surface area (up to 1000-1200 m/g), large porosity and strong adsorption and catalytic capability, can adsorb pollutant gases in catalytic air when being applied to the recycled asphalt concrete system, and improves the environment.
Example 7
The embodiment 7 of the invention provides a preparation scheme of activated sepiolite mineral powder, which comprises the following specific steps: firstly, grinding sepiolite slag into mineral powder with the particle size of 2mm, adding potassium hydrogen phosphate with the weight of 0.15 times of that of the sepiolite mineral powder into the sepiolite mineral powder raw material, dissolving the mixture in hot water with the temperature of 50 ℃ and uniformly mixing the mixture; adding hydrogen peroxide with the concentration of 4.5 percent, uniformly mixing, putting into a reaction tank, reacting for 90 minutes at the temperature of 65 ℃, taking out and draining; finally, carrying out plasma sputtering discharge treatment on the drained sepiolite powder, wherein the working parameters of the discharge treatment comprise: the accelerating voltage is set to 450V, the magnetic field is set to 150G, the air pressure is set to 6mTorr, the current density is 40mA/cm, the power density is 30W/cm, and the activated sepiolite mineral powder is obtained after the treatment is completed.
Example 8
The embodiment 8 of the invention provides a preparation scheme of activated sepiolite mineral powder, which comprises the following specific steps: firstly, grinding sepiolite slag into mineral powder with the particle size of 3mm, adding potassium hydrogen phosphate with the weight of 0.15 times of that of the sepiolite mineral powder into the sepiolite mineral powder raw material, dissolving the mixture in hot water with the temperature of 55 ℃ and uniformly mixing the mixture; adding 5.5% hydrogen peroxide, mixing uniformly, placing into a reaction tank, reacting at 70 ℃ for 100min, taking out, and draining; finally, carrying out plasma sputtering discharge treatment on the drained sepiolite powder, wherein the working parameters of the discharge treatment comprise: the accelerating voltage is set to be 500V, the magnetic field is set to be 200G, the air pressure is set to be 8mTorr, the current density is 50mA/cm, the power density is 40W/cm, and the activated sepiolite mineral powder is obtained after the treatment is completed.
Example 9
The embodiment 9 discloses a regenerant which can be applied to the embodiments 1-5, and specifically, the regenerant is prepared by mixing waste engine oil, C5 petroleum resin, modified bauxite and glyceryl monostearate according to the weight ratio of 1:0.5:0.2:0.05, and the preparation steps are as follows: weighing waste engine oil, C5 petroleum resin, bauxite and glyceryl monostearate according to the weight ratio, roasting the bauxite at 320 ℃ for 80min, soaking the bauxite in 10% hydrochloric acid solution for 60min, washing the bauxite to be neutral by deionized water, drying the bauxite for standby, adding fatty alcohol polyoxyethylene ether sodium sulfate which is equivalent to 2.5% of the bauxite weight, chlorinated paraffin-52 which is equivalent to 1.5% of the bauxite weight and polyisobutene which is equivalent to 3% of the bauxite weight, and fully mixing the bauxite with the deionized water through crushing and stirring to obtain modified bauxite powder with the particle size less than or equal to 0.3 mm; pouring the waste engine oil, the C5 petroleum resin, the glyceryl monostearate and the modified bauxite powder into a stirrer, and stirring and mixing for 2 hours at the temperature of 40 ℃ to obtain the regenerant.
Example 10
Based on example 9, this example 10 provides another regenerant preparation scheme, the preparation steps and parameters of which are as follows: weighing waste engine oil, C5 petroleum resin, bauxite and glyceryl monostearate according to the weight ratio, roasting bauxite at 340 ℃ for 85min, soaking for 70min by using 15% hydrochloric acid solution, washing to be neutral by using deionized water, drying for standby, adding fatty alcohol polyoxyethylene ether sodium sulfate which is equivalent to 2.5% of the bauxite weight, chlorinated paraffin 52 which is equivalent to 1.5% of the bauxite weight and polyisobutene which is equivalent to 3% of the bauxite weight, and obtaining modified bauxite powder with the particle size less than or equal to 0.3mm by fully mixing after crushing and stirring; pouring the waste engine oil, the C5 petroleum resin, the glyceryl monostearate and the modified bauxite powder into a stirrer, and stirring and mixing for 2.5 hours at the temperature of 45 ℃ to obtain the regenerant.
Example 11
Based on example 9, this example 11 provides another regenerant preparation scheme, the preparation steps and parameters of which are as follows: weighing the waste engine oil, the C5 petroleum resin, the bauxite and the glyceryl monostearate according to the weight ratio, roasting the bauxite at 360 ℃ for 90min, soaking the bauxite in a 20% hydrochloric acid solution for 80min, washing the bauxite to be neutral by deionized water, drying the bauxite for standby, adding fatty alcohol polyoxyethylene ether sodium sulfate which is equivalent to 2.5% of the bauxite weight, chlorinated paraffin 52 which is equivalent to 1.5% of the bauxite weight and polyisobutene which is equivalent to 3% of the bauxite weight, and obtaining modified bauxite powder with the particle size less than or equal to 0.3mm by fully mixing the crushed and stirred bauxite; pouring the waste engine oil, the C5 petroleum resin, the glyceryl monostearate and the modified bauxite powder into a stirrer, and stirring and mixing for 3 hours at the temperature of 50 ℃ to obtain the regenerant.
Example 12
This example 12 discloses a method for preparing recycled asphalt concrete, comprising the steps of:
weighing asphalt according to parts by weight, stirring uniformly in a stirrer at 150 ℃, pouring out and preserving heat for later use; pouring the waste asphalt mixture into a stirrer, and uniformly stirring at 130 ℃; adding asphalt, borax and activated sepiolite powder to be used into a stirrer, and fully mixing and stirring; finally, calcium lignosulfonate, isobutyl triethoxysilane, a regenerant, a coupling agent, an antioxidant and an anti-radiation agent are added, and stirring is carried out continuously for 2 hours at the temperature of 130 ℃ to obtain the regenerated asphalt concrete.
Example 13
This example 13 discloses a method for preparing recycled asphalt concrete, comprising the steps of:
weighing asphalt according to parts by weight, stirring uniformly in a stirrer at 160 ℃, pouring out and preserving heat for later use; pouring the waste asphalt mixture into a stirrer, and uniformly stirring at the temperature of 140 ℃; adding asphalt, borax and activated sepiolite powder to be used into a stirrer, and fully mixing and stirring; finally, calcium lignosulfonate, isobutyl triethoxysilane, a regenerant, a coupling agent, an antioxidant and an anti-radiation agent are added, and stirring is continued for 2.5 hours at the temperature of 140 ℃ to obtain the regenerated asphalt concrete.
Example 14
This example 14 discloses a method for preparing recycled asphalt concrete, comprising the steps of:
weighing asphalt according to parts by weight, stirring uniformly in a stirrer at 170 ℃, pouring out and preserving heat for later use; pouring the waste asphalt mixture into a stirrer, and uniformly stirring at the temperature of 150 ℃; adding asphalt, borax and activated sepiolite powder to be used into a stirrer, and fully mixing and stirring; finally, calcium lignosulfonate, isobutyl triethoxysilane, a regenerant, a coupling agent, an antioxidant and an anti-radiation agent are added, and stirring is carried out continuously for 3 hours at the temperature of 150 ℃ to obtain the regenerated asphalt concrete.
The activated sepiolite powder and the regenerant in examples 1 and 2 were prepared in examples 6 and 9, respectively, and the preparation methods of the regenerated asphalt concrete in examples 1 and 2 were performed in example 12.
The activated sepiolite powder and the regenerant in example 3 were prepared in examples 7 and 10, respectively, and the method for preparing the regenerated asphalt concrete in example 3 was performed in example 13.
The activated sepiolite powder and the regenerant in examples 4 and 5 were prepared in examples 8 and 11, respectively, and the preparation methods of the regenerated asphalt concrete in examples 4 and 5 were performed in example 14.
Comparative example 1
This comparative example 1 discloses a recycled asphalt concrete which differs from example 3 only in that:
the particle size of the waste asphalt mixture is 8.5+/-6.5 mm.
Comparative example 2
This comparative example 2 discloses a recycled asphalt concrete which differs from example 3 only in that:
comparative example 2 does not contain the component "activated sepiolite powder".
Comparative example 3
This comparative example 3 discloses a recycled asphalt concrete which differs from example 3 only in that:
in comparative example 3, the component "sepiolite powder" was used instead of "activated sepiolite powder", and the sepiolite powder was from the same manufacturer as in example 3, and the particle size of the powder was 0.1mm to 3mm.
Comparative example 4
This comparative example 4 discloses a recycled asphalt concrete which differs from example 3 only in that:
the coupling agent of comparative example 4 was silane coupling agent KH550.
Comparative example 5
This comparative example 5 discloses a recycled asphalt concrete which differs from example 3 only in that:
the regenerant of comparative example 5 was purchased directly from RA101 asphalt regenerant of new materials, inc. Of Jiangsu Su Bote.
Test examples
The following performance tests were carried out on the recycled asphalt concretes obtained in examples 1 to 5 and comparative examples 1 to 5, and the final test results are shown in Table 8 of Table 6 below:
detection item 1: dynamic stability of regenerated asphalt concrete rutting test (60 ℃ C.)
Table 6: dynamic stability of regenerated asphalt concrete rutting test (60 ℃ C.)
| Object(s) | Dynamic stability/(times/mm) |
| Example 1 | 2620 |
| Example 2 | 2680 |
| Example 3 | 2840 |
| Example 4 | 2810 |
| Example 5 | 2750 |
| Comparative example 1 | 2370 |
| Comparative example 2 | 1430 |
| Comparative example 3 | 1840 |
| Comparative example 4 | 2220 |
| Comparative example 5 | 1660 |
| Test method | T0719-2011 in JTGE 20-2011 |
It should be noted that: the dynamic stability is the number of times the regenerated asphalt concrete product walks after the test piece is deformed into a stable period when the regenerated asphalt concrete rut test is carried out according to the specified conditions, and the greater the dynamic stability, the stronger the rut resistance of the regenerated asphalt concrete product is according to the number of times per mm.
As can be seen from the analysis of the contents in the above Table 6, the dynamic stability of the recycled asphalt concrete prepared in the examples 1 to 5 of the present invention is more than 2600 times/mm, wherein the example 3 is the most preferred example, and the dynamic stability can reach 2840 times/mm; example 4 is a preferred example, and the dynamic stability can reach 2810 times/mm. The dynamic stability of the products in comparative examples 1-5 is reduced to 2400 times/mm, wherein the particle size of the waste asphalt mixture in comparative example 1 is 8.5+/-6.5 mm, and the influence on the products is minimum and the dynamic stability reduction rate is 16.5% unlike the technical scheme of the invention; in comparative example 2, the "activated sepiolite powder" was not contained and other substitute ingredients were not used, and the influence on the product was the greatest, and the dynamic stability reduction rate was 49.6%.
Detection item 2: : recycled asphalt concrete water stability
Table 7: recycled asphalt concrete water stability
| Object(s) | Residual stability in the immersion Marshall test/% | Residual strength ratio/%of freeze thawing cleavage test |
| Example 1 | 83 | 80 |
| Example 2 | 85 | 81 |
| Example 3 | 88 | 85 |
| Example 4 | 88 | 84 |
| Example 5 | 86 | 81 |
| Comparative example 1 | 81 | 76 |
| Comparative example 2 | 57 | 54 |
| Comparative example 3 | 71 | 67 |
| Comparative example 4 | 75 | 73 |
| Comparative example 5 | 66 | 61 |
| Test method | T0709-2011 in JTGE 20-2011 | T0729-2000 in JTGE 20-2011 |
It should be noted that: the residual stability is the ratio of the immersed Marshall stability to the standard Marshall stability, and the larger the Marshall residual stability is, the better the water stability of the asphalt mixture is; the 'freeze thawing split strength ratio' is that a regenerated asphalt concrete test piece is subjected to freeze thawing circulation under a specified condition, then a split strength test is carried out, the greater the split strength ratio of the test piece before and after freeze thawing is calculated in percent, the better the water stability of the asphalt mixture is.
As can be seen from the analysis of the contents in the above Table 7, the residual stability of the immersion Marshall test of the recycled asphalt concrete prepared in the examples 1 to 5 of the present invention is more than 83%, the residual strength ratio of the freeze thawing cleavage test is more than 80%, wherein the residual stability of the immersion Marshall test is up to 88%, and the residual strength ratio of the freeze thawing cleavage test is up to 85% in the example 3; the residual stability of the soaking Marshall test and the residual strength ratio of the freeze thawing cleavage test of the products in comparative examples 1-5 are obviously reduced, wherein the waste asphalt mixture in comparative example 1 is 8.5+/-6.5 mm, and the method has the advantages that the influence on the products is minimal, the reduction rate of the residual stability of the soaking Marshall test is 7.95%, and the reduction rate of the residual strength ratio of the freeze thawing cleavage test is 10.6%; the comparative example 2 does not contain activated sepiolite powder and does not use other substitute ingredients, so that the influence on the product is the greatest, the reduction rate of the residual stability of the soaking Marshall test is 35.23%, and the reduction rate of the residual strength ratio of the freeze thawing cleavage test is 36.5%.
Detection item 3: breaking strain capacity of recycled asphalt concrete in low-temperature bending test
Table 8: breaking strain capacity of recycled asphalt concrete in low-temperature bending test
| Object(s) | Breaking strain (. Mu.) (-10 ℃ C., 50 mm/min) |
| Example 1 | 2840 |
| Example 2 | 2920 |
| Example 3 | 3110 |
| Example 4 | 3050 |
| Example 5 | 2860 |
| Comparative example 1 | 2600 |
| Comparative example 2 | 1690 |
| Comparative example 3 | 2270 |
| Comparative example 4 | 2480 |
| Comparative example 5 | 2130 |
| Test method | T0719-2011 in JTGE 20-2011 |
It should be noted that: the low-temperature bending test damage strain capacity is the degree of bending deformation at the maximum deflection point when a certain concentrated load is applied to a regenerated asphalt concrete trabecular test piece with a specified size and test temperature in a span at a loading rate of 50mm/min until the test piece breaks and breaks; the greater the breaking strain, the better the strength and toughness, and the better the crack resistance.
As can be seen from the analysis of the contents in the above Table 8, the low temperature bending test strain capacity of the recycled asphalt concrete prepared in the examples 1 to 5 of the present invention is greater than 2800. Mu.A low temperature bending test strain capacity of the recycled asphalt concrete prepared in the example 3 is the most preferred example; example 4 is a preferred example, and the strain capacity under failure in the low temperature bending test can reach 3050 mu. The damage strain capacity of the products in comparative examples 1 to 5 is reduced, wherein the waste asphalt mixture in comparative example 1 is 8.5+/-6.5 mm, and the influence on the products is minimal and the damage strain capacity reduction rate is 16.4% unlike the technical scheme of the invention; in comparative example 2, the "activated sepiolite powder" was not contained and other substitute ingredients were not used, and the influence on the product was the greatest, and the failure strain capacity reduction rate was 45.6%.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The recycled asphalt concrete is characterized by comprising the following raw materials in parts by weight:
12-24 parts of asphalt;
48-62 parts of waste asphalt mixture;
1-5 parts of borax;
2-6 parts of activated sepiolite mineral powder;
0.5-2 parts of calcium lignosulfonate;
0.1-0.5 part of isobutyl triethoxysilane;
3-10 parts of a regenerant;
0.5-1.5 parts of coupling agent;
0.3-1 part of antioxidant;
0.1-0.3 part of anti-radiation agent; the coupling agent is a mixture of a rare earth coupling agent and a titanate coupling agent 201, and the mass ratio of the rare earth coupling agent to the titanate coupling agent 201 is 1:1 or 1:0.5; the antioxidant is selected from one or more of tri (2, 4-di-tert-butylphenyl) phosphite, beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-stearyl alcohol ester and tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester; the anti-radiation agent is ferrocene; the preparation method of the activated sepiolite mineral powder comprises the following steps: firstly grinding sepiolite slag into mineral powder with the particle size of 0.1-3 mm, adding potassium hydrogen phosphate with the weight of 0.15 times of that of the sepiolite mineral powder raw material into the sepiolite mineral powder raw material, dissolving the sepiolite mineral powder raw material into hot water with the temperature of 45-55 ℃ and uniformly mixing the sepiolite mineral powder raw material with the hot water; adding 3.5-5.5% hydrogen peroxide, mixing, placing into a reaction tank, reacting at 60-70deg.C for 80-100min, taking out, and draining; finally, carrying out plasma sputtering discharge treatment on the drained sepiolite powder, wherein the working parameters of the discharge treatment comprise: setting the accelerating voltage to 400-500V, setting the magnetic field to 100-200G, setting the air pressure to 3-8mTorr, setting the current density to 30-50mA/cm, setting the power density to 20-40W/cm, and finishing the treatment;
the regenerant is prepared by mixing waste engine oil, C5 petroleum resin, modified bauxite and glyceryl monostearate according to the weight ratio of 1:0.5:0.2:0.05, and the preparation steps are as follows: weighing the waste engine oil, the C5 petroleum resin, the bauxite and the glyceryl monostearate according to the weight ratio; roasting bauxite at 320-360 ℃ for 80-90min, soaking for 60-80min by using 10-20% hydrochloric acid solution, washing to be neutral by using deionized water, drying for standby, adding fatty alcohol polyoxyethylene ether sodium sulfate accounting for 2.5% of the weight of the bauxite, chlorinated paraffin-52 accounting for 1.5% of the weight of the bauxite and polyisobutene accounting for 3% of the weight of the bauxite, and fully and uniformly mixing through crushing and stirring to obtain modified bauxite powder with the particle size less than or equal to 0.3 mm; pouring the waste engine oil, the C5 petroleum resin, the glyceryl monostearate and the modified bauxite powder into a stirrer, and stirring and mixing for 2-3 hours at the temperature of 40-50 ℃ to obtain the modified bauxite powder;
the waste asphalt mixture comprises the following components with different particle diameters:
1) Particle size of 15+ -7.5 mm, weight percentage of 30-40%;
2) Particle diameter is 8.5 plus or minus 6.5mm, and weight percentage is 30-40%;
3) The grain diameter is less than 2mm, and the weight percentage is 20-40%.
2. A method for preparing recycled asphalt concrete according to claim 1, comprising the steps of: weighing asphalt according to parts by weight, stirring uniformly in a stirrer at 150-170 ℃, pouring out and preserving heat for later use; pouring the waste asphalt mixture into a stirrer, and uniformly stirring at 130-150 ℃; adding asphalt, borax and activated sepiolite powder to be used into a stirrer, and fully mixing and stirring; finally, calcium lignosulfonate, isobutyl triethoxysilane, a regenerant, a coupling agent, an antioxidant and an anti-radiation agent are added, and stirring is continuously carried out for 2-3 hours at the temperature of 130-150 ℃ to obtain the modified calcium lignosulfonate.
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