CN115385607A - High-mixing-amount plant-mixed hot recycled asphalt mixture and preparation method and application thereof - Google Patents
High-mixing-amount plant-mixed hot recycled asphalt mixture and preparation method and application thereof Download PDFInfo
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- CN115385607A CN115385607A CN202211126695.9A CN202211126695A CN115385607A CN 115385607 A CN115385607 A CN 115385607A CN 202211126695 A CN202211126695 A CN 202211126695A CN 115385607 A CN115385607 A CN 115385607A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 162
- 239000000203 mixture Substances 0.000 title claims abstract description 156
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 238000002156 mixing Methods 0.000 claims abstract description 97
- 239000000463 material Substances 0.000 claims abstract description 91
- 239000000843 powder Substances 0.000 claims abstract description 74
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 45
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 21
- 239000011707 mineral Substances 0.000 claims abstract description 21
- 238000004064 recycling Methods 0.000 claims abstract description 17
- 239000012492 regenerant Substances 0.000 claims abstract description 16
- 239000012783 reinforcing fiber Substances 0.000 claims abstract description 16
- 239000002174 Styrene-butadiene Substances 0.000 claims abstract description 13
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004816 latex Substances 0.000 claims abstract description 13
- 229920000126 latex Polymers 0.000 claims abstract description 13
- 239000011115 styrene butadiene Substances 0.000 claims abstract description 13
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 9
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 54
- 238000005507 spraying Methods 0.000 claims description 45
- 229910021536 Zeolite Inorganic materials 0.000 claims description 41
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 41
- 239000010457 zeolite Substances 0.000 claims description 41
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- VHYFNPMBLIVWCW-UHFFFAOYSA-N 4-Dimethylaminopyridine Chemical compound CN(C)C1=CC=NC=C1 VHYFNPMBLIVWCW-UHFFFAOYSA-N 0.000 claims description 32
- 238000012360 testing method Methods 0.000 claims description 29
- 238000003756 stirring Methods 0.000 claims description 25
- 229920001661 Chitosan Polymers 0.000 claims description 24
- VLHZUYUOEGBBJB-UHFFFAOYSA-N 18-hydroxyoctadecanoic acid Chemical compound OCCCCCCCCCCCCCCCCCC(O)=O VLHZUYUOEGBBJB-UHFFFAOYSA-N 0.000 claims description 22
- 239000011259 mixed solution Substances 0.000 claims description 20
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 19
- 239000004115 Sodium Silicate Substances 0.000 claims description 19
- 239000001110 calcium chloride Substances 0.000 claims description 19
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 19
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 19
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 19
- 239000000243 solution Substances 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 17
- 229910052697 platinum Inorganic materials 0.000 claims description 17
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 17
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 17
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 16
- 239000004677 Nylon Substances 0.000 claims description 16
- 239000004743 Polypropylene Substances 0.000 claims description 16
- 229920001778 nylon Polymers 0.000 claims description 16
- -1 polypropylene Polymers 0.000 claims description 16
- 229920001155 polypropylene Polymers 0.000 claims description 16
- 230000032050 esterification Effects 0.000 claims description 15
- 238000005886 esterification reaction Methods 0.000 claims description 15
- 229920002545 silicone oil Polymers 0.000 claims description 15
- 239000010455 vermiculite Substances 0.000 claims description 15
- 229910052902 vermiculite Inorganic materials 0.000 claims description 15
- 235000019354 vermiculite Nutrition 0.000 claims description 15
- 229960000549 4-dimethylaminophenol Drugs 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 14
- 239000012286 potassium permanganate Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 14
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 14
- 238000004381 surface treatment Methods 0.000 claims description 13
- 239000003054 catalyst Substances 0.000 claims description 12
- KUQWZSZYIQGTHT-UHFFFAOYSA-N hexa-1,5-diene-3,4-diol Chemical compound C=CC(O)C(O)C=C KUQWZSZYIQGTHT-UHFFFAOYSA-N 0.000 claims description 12
- 239000004793 Polystyrene Substances 0.000 claims description 11
- 229920002223 polystyrene Polymers 0.000 claims description 11
- 238000012216 screening Methods 0.000 claims description 9
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- 239000000835 fiber Substances 0.000 claims description 8
- 230000002378 acidificating effect Effects 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 235000019738 Limestone Nutrition 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 6
- 239000006028 limestone Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000003786 synthesis reaction Methods 0.000 claims description 6
- 238000006555 catalytic reaction Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 239000010692 aromatic oil Substances 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 229920005610 lignin Polymers 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 35
- QOSSAOTZNIDXMA-UHFFFAOYSA-N Dicylcohexylcarbodiimide Chemical compound C1CCCCC1N=C=NC1CCCCC1 QOSSAOTZNIDXMA-UHFFFAOYSA-N 0.000 description 28
- 230000000694 effects Effects 0.000 description 13
- 229910052739 hydrogen Inorganic materials 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
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- 125000000467 secondary amino group Chemical group [H]N([*:1])[*:2] 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
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- 238000010998 test method Methods 0.000 description 2
- 101000638161 Homo sapiens Tumor necrosis factor ligand superfamily member 6 Proteins 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 102100031988 Tumor necrosis factor ligand superfamily member 6 Human genes 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- 230000003746 surface roughness Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1074—Silicates, e.g. glass
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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)
- Inorganic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a high-volume plant-mixed hot recycling asphalt mixture and a preparation method and application thereof, wherein the asphalt mixture comprises the following components in parts by weight: 60-80 parts of recycled asphalt pavement materials, 2-4 parts of fresh asphalt, 15-25 parts of fresh aggregates, 12-20 parts of regenerant, 6-8 parts of warm-mixing agent, 3-5 parts of mineral powder, 2-4 parts of viscosity reducer, 1-3 parts of styrene-butadiene latex and 1-2 parts of reinforcing fibers. The high-mixing-amount plant-mixed hot recycled asphalt mixture provided by the invention can effectively improve the road performance and stability of the RAP material under the high mixing amount.
Description
Technical Field
The invention belongs to the technical field of recycled asphalt mixtures, and particularly relates to a high-volume plant-mixed hot recycled asphalt mixture and a preparation method and application thereof.
Background
At present, the mixing amount of the RAP (reclaimed asphalt for asphalt pavement) in the hot mix plant recycling asphalt mixture is in a mature range of 10-30%, and the mixing amount is high when the mixing amount is more than 30%. The research of the factory mix hot recycling asphalt mixture with high mixing amount in China is in the initial stage, and in view of the complexity of the RAP material, the obstacles for improving the mixing amount of the RAP material at present mainly comprise technical standards, variability, recording performance limitation and the like. It is therefore critical to control the quality stability of the RAP material.
The hot plant mixing regeneration is to transport the old asphalt pavement back to the mixing plant after digging, then to crush the old asphalt pavement intensively, to design the mixture ratio according to the quality requirements of different levels of the pavement, to determine the adding proportion of the old asphalt mixture, and to mix the regenerant, the new asphalt material, the new aggregate and the like in the mixing plant again according to a certain proportion to form a new mixture, thereby obtaining excellent regenerated asphalt concrete and paving the good regenerated asphalt pavement. Hot plant mix recycling requires mixing of the asphalt mixture at a higher temperature, and the discharge temperature of the recycled asphalt mixture is usually 5-15 ℃ higher than that of the common hot mix asphalt mixture, so that the processing temperature of the RAP material is higher, secondary aging of asphalt in the RAP material is increased, and the performance of the recycled asphalt mixture is influenced.
In order to reduce the secondary aging of asphalt in the RAP material, a warm-mixing agent is required to be added to reduce the construction temperature of the RAP material, the warm-mixing agent is a surfactant and acts with other easily-foamed substances in the asphalt mixture, so that bubbles in the mixture are increased and are difficult to defoam, the performance of the mixture is influenced, and in addition, the addition of a defoaming agent requires adjustment of the using amount and stability test, and the work is complicated.
In addition, after the RAP material is used for a long time, the old aggregate can be seriously damaged and even cracks are formed, the strength of the RAP material is influenced, the old asphalt is adhered to the surface of the old aggregate, the dispersibility of the RAP material in the regenerated asphalt mixture is influenced, and the variability is added to the improvement of the mixing amount of the RAP material.
In summary, how to design a hot mix plant recycling asphalt mixture with high content of plant mix, which can effectively improve road performance and stability under the condition of high content of RAP material, is a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to solve the technical problems and provide a high-content plant-mixed hot-recycling asphalt mixture and a preparation method and application thereof.
The invention achieves the above purpose through the following technical scheme:
a high-mixing-amount plant-mixed hot recycled asphalt mixture comprises the following components in parts by weight: 60-80 parts of recycled asphalt pavement materials, 2-4 parts of fresh asphalt, 15-25 parts of fresh aggregates, 12-20 parts of regenerant, 6-8 parts of warm-mixing agent, 3-5 parts of mineral powder, 2-4 parts of viscosity reducer, 1-3 parts of styrene-butadiene latex and 1-2 parts of reinforcing fibers.
The preparation method of the warm mixing agent comprises the following steps:
(1) Evenly mixing hydrogen-terminated silicone oil and a platinum catalyst, then dripping the mixture into divinyl glycol under the stirring condition at the temperature of 70-90 ℃, and reacting for 4-6 hours to obtain an addition product;
(2) Oxidizing hydroxyl in the addition product into carboxyl under the condition of an acidic potassium permanganate solution, stopping the reaction until the color of potassium permanganate is faded, washing with water to remove impurities, and stirring and reacting the obtained oxidation product and 18-hydroxyoctadecanoic acid for 5-6 hours at the temperature of 90-110 ℃ under the catalysis of concentrated sulfuric acid (the addition amount is 0.3-0.5 percent) to obtain an esterification product;
(3) And (2) mixing the esterification product, chitosan and dichloromethane (the addition amount of the chitosan and the dichloromethane is 3-6 times of the addition amount of the two, then dropwise adding a dichloromethane solution of DCC (N, N' -dicyclohexylcarbodiimide)/DMAP (4-dimethylaminopyridine) (the addition amount of the dichloromethane solution is 2-4 times of the total amount of the DCC and the DMAP) at 10-40 ℃, and stirring for reacting for 6-12 hours to obtain the warm mixing agent.
Further, the recycled asphalt pavement material is derived from one or more of AC-13, AC-20 and AC-25 asphalt pavements, the new asphalt is SBS modified asphalt, the new aggregate is basalt or limestone with the particle size of 1-10 mm, the regenerant is aromatic oil, the mineral powder is limestone mineral powder or blast furnace slag, the viscosity reducer is EC-120, and the reinforcing fiber is lignin fiber, carbon fiber or polyester fiber.
Further, the mol ratio of the hydrogen-terminated silicone oil, the divinyl glycol, the 18-hydroxyoctadecanoic acid and the chitosan is (2.1-2.2): 1: (1.1-2.3): (1.1-2.3).
Further, in the step (1), the platinum catalyst is chloroplatinic acid or a Karster platinum catalyst, and the addition amount of the platinum catalyst is 3-20 ppm calculated by platinum; the hydrogen content of the terminal hydrogen-containing silicone oil is 3-5%, and the viscosity of the terminal hydrogen-containing silicone oil is 20-40 cs;
in the step (2), the molar ratio of potassium permanganate to addition product is 4 (2-5), and the concentration of the acidic potassium permanganate solution is 0.5-3%;
in the step (4), the molar ratio of the esterification product to the chitosan to the DCC to DMAP is 1: (1.1-1.3): (1.2-1.4): (0.1-0.2).
The invention also provides a preparation method of the high-volume plant-mixed hot recycled asphalt mixture, which comprises the following steps:
s1, separating old asphalt and old aggregates in the asphalt pavement reclaimed materials by adopting an extraction test, measuring the mass content of the old asphalt, carrying out a screening test on the old aggregates, checking the original gradation of the asphalt pavement reclaimed materials, carrying out gradation synthesis on the asphalt pavement reclaimed materials, new aggregates and mineral powder, and determining the using amount of the new asphalt by a Marshall test;
s2, dividing the screened old aggregates into old aggregates (fine aggregates) passing through a 2.36mm screen and old aggregates (coarse aggregates) not passing through the 2.36mm screen, spraying an expansive material on the surfaces of the old aggregates passing through the 2.36mm screen, and spraying an isolating material on the surfaces of the old aggregates not passing through the 2.36mm screen to finish the surface treatment of the old aggregates;
s3, mixing the old asphalt, the old aggregate which does not pass through a screen with the size of 2.36mm, the new asphalt, the new aggregate and the regenerant for 40 to 60 seconds at the temperature of between 120 and 130 ℃, then adding a warm-mixing agent, styrene-butadiene latex and reinforcing fibers, cooling to the temperature of between 95 and 120 ℃, and continuously mixing for 50 to 75 seconds;
and S4, cooling to 70-90 ℃, adding the old aggregate passing through the 2.36mm screen mesh, stirring for 20-40S, then heating to 100-120 ℃, and continuously stirring for 10-20S to obtain a finished product of the regenerated asphalt mixture.
Further, the raw material composition of the expandable material comprises: 6-10 parts of polymethyl methacrylate, 3-6 parts of polypropylene, 5-8 parts of nylon, 2-4 parts of vermiculite powder, 2-5 parts of sodium silicate and 3-6 parts of calcium chloride; the isolation material comprises the following raw materials in percentage by mass of 1: (5-10).
Further, the spraying method of the expansion material comprises the following steps: firstly, mixing vermiculite powder, sodium silicate and water to prepare a first mixture, mixing calcium chloride and water to prepare a second mixture, simultaneously spraying the first mixture and the second mixture on the surface of old aggregate passing through a 2.36mm screen mesh, and drying; melting and mixing polymethyl methacrylate, polypropylene and nylon at 180-200 ℃ to obtain a mixture III, then spraying the mixture III onto the surface of the old aggregate passing through a 2.36mm screen, and cooling and drying the mixture to obtain the composite material.
The spraying method of the isolating material comprises the following steps: the polystyrene and the acetone are mixed evenly and then directly sprayed, and the spraying amount is 0.5 to 2 percent.
Furthermore, the adding amount of water in the first mixed solution is 6-12 times of that of the sodium silicate, the adding amount of water in the second mixed solution is 5-10 times of that of the calcium chloride, and the spraying amounts of the first mixed solution and the third mixed solution are 0.2-0.4%, 0.1-0.2% and 0.4-0.8% respectively.
Furthermore, the raw material of the expandable material also comprises 4-7 parts of zeolite powder, and the zeolite powder, polymethyl methacrylate, polypropylene and nylon are melted and mixed into a mixture III at 180-200 ℃; the insulating material also comprises zeolite powder, wherein the mass ratio of the polystyrene to the zeolite powder is 1: (0.05-0.1).
Further, the zeolite powder is used after being treated by the following steps: putting zeolite powder into sodium lignosulphonate solution for soaking for 1-2 h, and then evaporating water, wherein the mass ratio of the zeolite powder to the sodium lignosulphonate is 1: (0.04-0.08).
The invention also provides application of the high-volume plant-mixed hot recycled asphalt mixture in road construction.
The invention has the beneficial effects that:
(1) The warm mixing agent prepared by the invention not only reduces the construction temperature of the asphalt mixture and improves the road performance, but also has a defoaming function.
(2) According to the warm-mixing agent prepared by the invention, hydrogen-containing silicone oil is grafted on two vinyl groups of divinyl glycol, and 18-hydroxyoctadecanoic acid and chitosan are sequentially grafted on the other two hydroxyl groups after the other two hydroxyl groups are oxidized into carboxyl groups, so that the whole warm-mixing agent simultaneously contains hydrophilic secondary amino groups, chitosan, lipophilic long-chain alkane and a defoaming silica chain segment, and has good surface activity and defoaming effect.
(3) The warm mixing agent prepared by the invention has strong surface activity, can enhance the adhesion between asphalt and aggregate, and has good anti-stripping effect.
(4) The method divides the old aggregates into coarse aggregates and fine aggregates according to the particle size, and sprays the polystyrene material on the surface of the coarse aggregates to prevent the old asphalt on the surface from influencing the dispersion, so that the strength of the old asphalt can be enhanced while forming the barrier; because the fine aggregates are generally embedded in gaps among the coarse aggregates, after the expandable material is sprayed on the surfaces of the fine aggregates, the fine aggregates can generate fine expansion in the subsequent use process, gaps are reduced, and the structural stability of the fine aggregates and the coarse aggregates is enhanced.
(5) When the invention sprays the swelling material to the fine aggregate, firstly the vermiculite powder is guided into the gap of the fine aggregate through the action of the sodium silicate and the calcium chloride, and then the polymethyl methacrylate, the polypropylene and the nylon are sprayed, so that the fine aggregate not only has enhanced structure, but also has the swelling compensation effect.
(6) The surface treatment of the old aggregate reduces the surface roughness of the old aggregate, affects the adhesion of the warm-mixing agent to the old aggregate and finally affects the anti-stripping effect, so the zeolite powder is added into the material sprayed on the surface of the old aggregate, the warm-mixing agent contains basic secondary amine groups, and the zeolite powder is porous acidic rock, so the warm-mixing agent can form adsorption with the surface of the old aggregate, and the anti-stripping effect of the warm-mixing agent is enhanced.
(7) The zeolite powder is also treated by the sodium lignosulfonate, and the anti-stripping effect of the warm mixing agent is further promoted because the warm mixing agent contains hydrophilic chitosan, the chitosan contains positive charge groups, and the sodium lignosulfonate contains negative charge groups.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The RAP materials used in the following examples or comparative examples are all AC-13 asphalt pavement milling materials with the same source and the same particle size.
Example 1
Firstly, sampling an asphalt pavement reclaimed material, separating old asphalt and old aggregate in an RAP material by adopting an extraction test, measuring the mass content of the old asphalt in the RAP material to be 3.5% by the test, and testing the old aggregate, the new aggregate (basalt is selected in the embodiment), the old asphalt and the new asphalt (SBS modified asphalt is selected in the embodiment) according to the requirements of road engineering asphalt and asphalt mixture test procedures (JTGE 20-2011) and road engineering aggregate test procedures (JTGE 42), wherein the results are shown in tables 1 and 2.
TABLE 1 mineral aggregate gradation and relative Density of old aggregates in New aggregates, RAP aggregates
TABLE 2 Performance index of old asphalt in New asphalt and RAP Material
RAP material, new aggregate and mineral powder are graded and synthesized, the new asphalt dosage is determined through a Marshall test, and both the synthetic grading and the Marshall test meet the requirements of technical Specification for road asphalt pavement construction (JTG F40-2004).
The high-volume hot mix plant recycling asphalt mixture provided by the embodiment comprises the following components in parts by mass: 60 parts of asphalt pavement reclaimed materials (RAP), 2 parts of new asphalt, 15 parts of new aggregate, 12 parts of regenerant, 6 parts of warm-mixing agent, 3 parts of mineral powder, 2 parts of viscosity reducer, 1 part of styrene-butadiene latex and 1 part of reinforcing fiber.
The RAP material is from an AC-13 asphalt pavement, the new asphalt is SBS modified asphalt, the new aggregate is basalt with the particle size of 1-10 mm, the regenerating agent is aromatic oil, the warm-mixing agent is APTL/01 warm-mixing agent, the mineral powder is limestone mineral powder, the viscosity reducer is EC-120, and the reinforcing fiber is lignin fiber.
The preparation method of the high-volume plant-mixed hot recycled asphalt mixture comprises the following steps:
s1, separating old asphalt and old aggregates in the asphalt pavement reclaimed materials by adopting an extraction test, measuring the mass content of the old asphalt, performing a screening test on the old aggregates, testing the original gradation of the asphalt pavement reclaimed materials, performing gradation synthesis on the asphalt pavement reclaimed materials, new aggregates and mineral powder, and determining the using amount of the new asphalt by a Marshall test;
s2, mixing the old asphalt, the old aggregate, the new asphalt, the new aggregate and the regenerant for 40S at 120 ℃, then adding the warm-mixing agent, the styrene-butadiene latex and the reinforced fibers, cooling to 95 ℃, and continuously mixing for 50S to obtain a regenerated asphalt mixture finished product.
Example 2
The embodiment provides a high-volume plant-mixed hot recycled asphalt mixture, and the preparation method of the used warm mixing agent comprises the following steps:
(1) Uniformly mixing hydrogen-terminated silicone oil (with hydrogen content of 3% and viscosity of 20 cs) and a platinum catalyst (chloroplatinic acid catalyst, the addition amount of which is 3ppm calculated by platinum), then dripping the mixture into divinyl glycol under the condition of stirring at 70 ℃, and reacting for 4 hours to obtain an addition product;
(2) Oxidizing hydroxyl in the addition product into carboxyl under the condition of an acidic potassium permanganate solution (with the concentration of 0.5 percent), stopping the reaction until the color of potassium permanganate is faded, washing with water to remove impurities, and stirring and reacting the obtained oxidation product and 18-hydroxyoctadecanoic acid for 5 hours under the catalysis of concentrated sulfuric acid (with the addition of 0.3 percent) at 90 ℃ to obtain an esterification product; the molar ratio of potassium permanganate to addition product is 2;
(3) And (2) mixing the esterification product, chitosan and dichloromethane (the addition amount of the chitosan and dichloromethane is 3 times of that of the first two), then dropwise adding a dichloromethane (the addition amount of the dichloromethane is 2 times of the total amount of DCC and DMAP) solution of DCC (N, N' -dicyclohexylcarbodiimide)/DMAP (4-dimethylaminopyridine) at 10 ℃, and stirring for reacting for 6 hours to obtain the warm mixing agent. The molar ratio of the esterification product to the chitosan to the DCC to DMAP is 1:1.1:1.2:0.1.
the mol ratio of the hydrogen-terminated silicone oil to the divinyl glycol to the 18-hydroxyoctadecanoic acid to the chitosan is 2.1:1:1.1:1.1.
the rest was the same as in example 1.
Example 3
On the basis of embodiment 2, the embodiment provides a high-content hot mix plant recycling asphalt mixture, and the preparation method comprises the following steps:
s1, separating old asphalt and old aggregates in the asphalt pavement reclaimed materials by adopting an extraction test, measuring the mass content of the old asphalt, performing a screening test on the old aggregates, testing the original gradation of the asphalt pavement reclaimed materials, performing gradation synthesis on the asphalt pavement reclaimed materials, new aggregates and mineral powder, and determining the using amount of the new asphalt by a Marshall test;
s2, dividing the old aggregate obtained by screening into old aggregate passing through a 2.36mm screen and old aggregate not passing through the 2.36mm screen, spraying an expansive material on the surface of the old aggregate passing through the 2.36mm screen, and spraying an isolating material on the surface of the old aggregate not passing through the 2.36mm screen to finish the surface treatment of the old aggregate;
s3, mixing the old asphalt, the old aggregate which does not pass through a 2.36mm screen, the new asphalt, the new aggregate and the regenerant for 40S at 120 ℃, then adding the warm-mixing agent, the styrene-butadiene latex and the reinforcing fiber, and continuously mixing for 50S at the temperature of 95 ℃;
and S4, cooling to 70 ℃, adding the old aggregate passing through a 2.36mm screen, stirring for 20S, heating to 100 ℃, and continuously stirring for 10S to obtain a finished product of the regenerated asphalt mixture.
The raw material composition of the expandable material comprises: 6 parts of polymethyl methacrylate, 3 parts of polypropylene, 5 parts of nylon, 2 parts of vermiculite powder, 2 parts of sodium silicate and 3 parts of calcium chloride.
The spraying method of the expansion material comprises the following steps: firstly, mixing vermiculite powder, sodium silicate and water to prepare a first mixture, mixing calcium chloride and water to prepare a second mixture, simultaneously spraying the first mixture and the second mixture on the surface of old aggregate passing through a 2.36mm screen mesh, and drying; melting and mixing polymethyl methacrylate, polypropylene and nylon at 180 ℃ to obtain a mixture III, then spraying the mixture III onto the surface of the old aggregate passing through a 2.36mm screen, and cooling and drying the mixture.
The adding amount of water in the first mixed solution is 6 times of that of the sodium silicate, the adding amount of water in the second mixed solution is 5 times of that of the calcium chloride, and the spraying amounts of the first mixed solution and the third mixed solution are 0.2%, 0.1% and 0.4% respectively.
The insulation material comprises the following raw materials in percentage by mass of 1:5.
the spraying method of the isolating material comprises the following steps: the polystyrene and the acetone are mixed evenly and then directly sprayed, and the spraying amount is 0.5 percent.
The rest was the same as in example 2.
Example 4
On the basis of example 3, the present example provides a hot mix plant recycling asphalt mixture with high mixing amount, in the preparation method of the recycling asphalt mixture, the screened old aggregates are divided into old aggregates passing through a 2.36mm screen and old aggregates not passing through the 2.36mm screen, the surface of the old aggregates passing through the 2.36mm screen is sprayed with an expansive material, and the surface of the old aggregates not passing through the 2.36mm screen is sprayed with an insulating material, so as to complete the surface treatment of the old aggregates.
The raw materials of the expandable material are as follows: 6 parts of polymethyl methacrylate, 3 parts of polypropylene, 5 parts of nylon, 2 parts of vermiculite powder, 2 parts of sodium silicate, 3 parts of calcium chloride and 4 parts of zeolite powder.
The spraying method of the expansion material comprises the following steps: firstly, mixing vermiculite powder, sodium silicate and water to prepare a first mixture, mixing calcium chloride and water to prepare a second mixture, simultaneously spraying the first mixture and the second mixture on the surface of old aggregate passing through a 2.36mm screen, and drying; melting and mixing polymethyl methacrylate, polypropylene, nylon and zeolite powder at 180 ℃ to obtain a mixture III, then spraying the mixture III onto the surface of the old aggregate passing through a 2.36mm screen, and cooling and drying to obtain the composite material.
The insulating material comprises the following raw materials: the polystyrene, the acetone and the zeolite powder are mixed according to the mass ratio of 1:5:0.05.
the zeolite powder is used after being treated as follows: soaking zeolite powder in sodium lignosulfonate solution for 1h, and then evaporating water to obtain the zeolite-containing composite material, wherein the mass ratio of the zeolite powder to the sodium lignosulfonate is 1:0.04.
the rest is the same as in example 3.
Example 5
The embodiment provides a high-volume plant-mixed hot recycling asphalt mixture, which comprises the following components in parts by mass: 70 parts of asphalt pavement reclaimed materials (RAP), 3 parts of new asphalt, 20 parts of new aggregate, 16 parts of regenerant, 7 parts of warm-mixing agent, 4 parts of mineral powder, 3 parts of viscosity reducer, 2 parts of styrene-butadiene latex and 1.5 parts of reinforcing fibers. The RAP material is derived from an AC-20 asphalt pavement, and the reinforcing fiber is carbon fiber.
The preparation method of the warm mixing agent comprises the following steps:
(1) Uniformly mixing hydrogen-terminated silicone oil (the hydrogen content is 4%, the viscosity is 30 cs) and a platinum catalyst (chloroplatinic acid catalyst, the addition amount of the chloroplatinic acid catalyst is 12ppm calculated by platinum), then dripping the mixture into divinyl glycol under the condition of stirring at the temperature of 80 ℃, and reacting for 5 hours to obtain an addition product;
(2) Oxidizing hydroxyl in the addition product into carboxyl under the condition of an acidic potassium permanganate solution (with the concentration of 2 percent), stopping the reaction until the color of potassium permanganate is faded, washing with water to remove impurities, and stirring and reacting the obtained oxidation product and 18-hydroxyoctadecanoic acid for 5.5 hours under the catalysis of concentrated sulfuric acid (with the addition amount of 0.4 percent) at the temperature of 100 ℃ to obtain an esterification product; the molar ratio of potassium permanganate to addition product is 4:3.5;
(3) And (3) mixing the esterification product, chitosan and dichloromethane (the addition amount of the chitosan and dichloromethane is 4.5 times of that of the two components), then dropwise adding dichloromethane solution of DCC/DMAP (the addition amount of the dichloromethane is 3 times of the total amount of the DCC and DMAP) at 25 ℃, and stirring and reacting for 9 hours to obtain the warm-mixing agent. The molar ratio of the esterification product to the chitosan to the DCC to DMAP is 1:1.2:1.3:0.15.
the mol ratio of the hydrogen-terminated silicone oil to the divinyl glycol to the 18-hydroxyoctadecanoic acid to the chitosan is 2.15:1:1.7:1.7.
the invention also provides a preparation method of the high-volume plant-mixed hot recycled asphalt mixture, which comprises the following steps:
s1, separating old asphalt and old aggregates in the asphalt pavement reclaimed materials by adopting an extraction test, measuring the mass content of the old asphalt, performing a screening test on the old aggregates, testing the original gradation of the asphalt pavement reclaimed materials, performing gradation synthesis on the asphalt pavement reclaimed materials, new aggregates and mineral powder, and determining the using amount of the new asphalt by a Marshall test;
s2, dividing the screened old aggregates into old aggregates which pass through a 2.36mm screen and old aggregates which do not pass through the 2.36mm screen, spraying an expansive material on the surfaces of the old aggregates which pass through the 2.36mm screen, and spraying a separation material on the surfaces of the old aggregates which do not pass through the 2.36mm screen to finish the surface treatment of the old aggregates;
s3, mixing the old asphalt, the old aggregate which does not pass through a 2.36mm screen, the new asphalt, the new aggregate and the regenerant for 50S at 125 ℃, then adding a warm mixing agent, styrene-butadiene latex and reinforcing fibers, and continuously mixing for 60S at 105 ℃;
and S4, cooling to 80 ℃, adding the old aggregate passing through a 2.36mm screen, stirring for 30S, heating to 110 ℃, and continuously stirring for 15S to obtain a finished product of the regenerated asphalt mixture.
The raw materials of the expandable material are as follows: 8 parts of polymethyl methacrylate, 4.5 parts of polypropylene, 6.5 parts of nylon, 3 parts of vermiculite powder, 3.5 parts of sodium silicate, 4.5 parts of calcium chloride and 5.5 parts of zeolite powder.
The spraying method of the expansion material comprises the following steps: firstly, mixing vermiculite powder, sodium silicate and water to prepare a first mixture, mixing calcium chloride and water to prepare a second mixture, simultaneously spraying the first mixture and the second mixture on the surface of old aggregate passing through a 2.36mm screen, and drying; melting and mixing polymethyl methacrylate, polypropylene, nylon and zeolite powder at 190 ℃ to obtain a mixture III, then spraying the mixture III onto the surface of the old aggregate passing through a 2.36mm screen, and cooling and drying the mixture to obtain the composite material.
The adding amount of water in the first mixed solution is 9 times of that of the sodium silicate, the adding amount of water in the second mixed solution is 7.5 times of that of the calcium chloride, and the spraying amounts of the first mixed solution and the third mixed solution are 0.3%, 0.15% and 0.6% respectively.
The isolating material comprises the following raw materials: the polystyrene, the acetone and the zeolite powder are mixed according to the mass ratio of 1:7.5:0.07.
the spraying method of the isolating material comprises the following steps: the polystyrene and the acetone are mixed evenly and then directly sprayed, and the spraying amount is 1.2 percent.
The zeolite powder is used after being treated as follows: soaking zeolite powder in sodium lignosulphonate solution for 1.5 hours, and then evaporating water to obtain the zeolite powder, wherein the mass ratio of the zeolite powder to the sodium lignosulphonate is 1:0.06.
the rest was the same as in example 4.
Example 6
The embodiment provides a high-volume plant-mixed hot recycling asphalt mixture, which comprises the following components in parts by mass: 80 parts of asphalt pavement reclaimed materials (RAP), 4 parts of new asphalt, 25 parts of new aggregate, 20 parts of regenerant, 8 parts of warm-mixing agent, 5 parts of mineral powder, 4 parts of viscosity reducer, 3 parts of styrene-butadiene latex and 2 parts of reinforcing fiber.
The RAP material is from an AC-25 asphalt pavement, the new aggregate is limestone with the particle size of 1-10 mm, the mineral powder is blast furnace slag, and the reinforced fiber is polyester fiber.
The preparation method of the warm mixing agent comprises the following steps:
(1) Uniformly mixing hydrogen-terminated silicone oil (with hydrogen content and viscosity being cs) and a platinum catalyst (Kaersite platinum catalyst, the addition amount of which is 20ppm calculated by platinum), then dripping the mixture into divinyl glycol under the condition of stirring at 90 ℃, and reacting for 6 hours to obtain an addition product;
(2) Oxidizing hydroxyl in the addition product into carboxyl under the condition of an acidic potassium permanganate solution (with the concentration of 3 percent), stopping the reaction until the color of potassium permanganate is faded, washing with water to remove impurities, reacting the obtained oxidation product with 18-hydroxyoctadecanoic acid under the catalysis of concentrated sulfuric acid (with the addition amount of 0.5 percent) at 110 ℃ for 6 hours under stirring to obtain an esterification product; the molar ratio of potassium permanganate to addition product is 4:5;
(3) And (3) mixing the esterification product, chitosan and dichloromethane (the addition amount of the chitosan and dichloromethane is 6 times of that of the first two), then dropwise adding dichloromethane solution of DCC/DMAP (the addition amount of the dichloromethane is 4 times of the total amount of the DCC and DMAP) at the temperature of 10-40 ℃, and stirring and reacting for 12 hours to obtain the warm mixing agent. The molar ratio of the esterification product to the chitosan to the DCC to DMAP is 1:1.3:1.4:0.2.
the mol ratio of the hydrogen-terminated silicone oil to the divinyl glycol to the 18-hydroxyoctadecanoic acid to the chitosan is 2.2:1:2.3: 2.3).
The invention also provides a preparation method of the high-volume plant-mixed hot recycled asphalt mixture, which comprises the following steps:
s1, separating old asphalt and old aggregates in the asphalt pavement reclaimed materials by adopting an extraction test, measuring the mass content of the old asphalt, performing a screening test on the old aggregates, testing the original gradation of the asphalt pavement reclaimed materials, performing gradation synthesis on the asphalt pavement reclaimed materials, new aggregates and mineral powder, and determining the using amount of the new asphalt by a Marshall test;
s2, dividing the old aggregate obtained by screening into old aggregate passing through a 2.36mm screen and old aggregate not passing through the 2.36mm screen, spraying an expansive material on the surface of the old aggregate passing through the 2.36mm screen, and spraying an isolating material on the surface of the old aggregate not passing through the 2.36mm screen to finish the surface treatment of the old aggregate;
s3, mixing the old asphalt, the old aggregate which does not pass through a 2.36mm screen, the new asphalt, the new aggregate and the regenerant for 60S at 130 ℃, then adding a warm mixing agent, styrene-butadiene latex and reinforcing fibers, and cooling to 120 ℃ to continue mixing for 75S;
and S4, cooling to 90 ℃, adding the old aggregate passing through a 2.36mm screen, stirring for 40S, heating to 120 ℃, and continuously stirring for 20S to obtain a finished product of the regenerated asphalt mixture.
The raw materials of the expandable material are as follows: 10 parts of polymethyl methacrylate, 6 parts of polypropylene, 8 parts of nylon, 4 parts of vermiculite powder, 5 parts of sodium silicate, 6 parts of calcium chloride and 7 parts of zeolite powder.
The spraying method of the expansion material comprises the following steps: firstly, mixing vermiculite powder, sodium silicate and water to prepare a first mixture, mixing calcium chloride and water to prepare a second mixture, simultaneously spraying the first mixture and the second mixture on the surface of old aggregate passing through a 2.36mm screen, and drying; melting and mixing polymethyl methacrylate, polypropylene, nylon and zeolite powder at 200 ℃ to obtain a mixture III, then spraying the mixture III onto the surface of the old aggregate passing through a 2.36mm screen, and cooling and drying to obtain the composite material.
The adding amount of water in the first mixed solution is 12 times of that of sodium silicate, the adding amount of water in the second mixed solution is 10 times of that of calcium chloride, and the spraying amounts of the first mixed solution and the second mixed solution are 0.4%, 0.2% and 0.8% respectively.
The isolating material comprises the following raw materials: the polystyrene, the acetone and the zeolite powder are mixed according to the mass ratio of 1:10:0.1.
the spraying method of the isolating material comprises the following steps: the polystyrene and the acetone are mixed evenly and then directly sprayed, and the spraying amount is 2 percent.
The zeolite powder is used after being treated as follows: soaking zeolite powder in sodium lignosulfonate solution for 2 hours, and then evaporating water to obtain the zeolite-containing composite material, wherein the mass ratio of the zeolite powder to the sodium lignosulfonate is 1:0.08.
the rest is the same as in example 4.
Comparative example 1
This comparative example differs from example 4 in that the warm-mix preparation step does not include step (1), i.e. divinyl glycol is used directly as the starting reactant without introducing terminal hydrogen-containing silicone oil.
Comparative example 2
This comparative example differs from example 5 in that the warm-mix agent was changed to silicone oil.
Comparative example 3
This comparative example differs from example 4 in that the warm-mix preparation step does not include step (3), i.e., no chitosan is introduced.
Comparative example 4
This comparative example differs from example 5 in that the process for the preparation of the hot mix plant recycled asphalt mixture does not comprise steps S2 and S4, i.e. does not comprise a surface treatment of the old aggregate.
Comparative example 5
This comparative example differs from example 5 in that only the surface treatment of the old aggregate passing through the 2.36mm screen was performed in the method for preparing the hot mix plant recycled asphalt mixture.
Comparative example 6
This comparative example differs from example 5 in that only the surface treatment of the old aggregate that did not pass through the 2.36mm screen was performed in the process for preparing the hot mix plant recycled asphalt mixture.
Comparative example 7
The present comparative example is different from example 5 in that the old aggregate obtained by screening is classified into an old aggregate passing through a 4.75mm screen and an old aggregate not passing through a 4.75mm screen in the preparation method of the hot mix in plants recycled asphalt mixture of step S2.
Comparative example 8
The present comparative example differs from example 5 in that the hot mix plant recycled asphalt mixture preparation method divides the screened old aggregates into old aggregates passing through a 1.18mm screen and old aggregates not passing through a 1.18mm screen in step S2.
Comparative example 9
The present comparative example differs from example 5 in that the method of preparing a hot mix plant mix reclaimed asphalt does not include step S4, when step S3 is: mixing the old asphalt, the old aggregate, the new asphalt, the new aggregate and the regenerant for 50s at 125 ℃, then adding the warm-mixing agent, the styrene-butadiene latex and the reinforcing fiber, cooling to 105 ℃, and continuously mixing for 60s.
Comparative example 10
This comparative example differs from example 5 in that no vermiculite powder is included in the intumescent material.
Comparative example 11
This comparative example differs from example 5 in that the intumescent material does not include sodium silicate and calcium chloride and is sprayed by a method comprising: mixing vermiculite powder with water, spraying onto the surface of old aggregate passing through 2.36mm screen, and drying; melting and mixing polymethyl methacrylate, polypropylene, nylon and zeolite powder at 190 ℃, continuously spraying the mixture onto the surface of the old aggregate passing through a 2.36mm screen, and cooling and drying the mixture to obtain the composite material.
Comparative example 12
This comparative example differs from example 5 in that polymethyl methacrylate is not included in the intumescent material.
Comparative example 13
This comparative example differs from example 6 in that the zeolite powder was not treated with sodium lignosulfonate.
1. The pavement performance of the high-volume plant-mixed hot recycled asphalt mixture prepared by the invention
The road performance of the high-content plant-mixed hot recycled asphalt mixtures prepared in examples 1 to 6 and comparative examples 1 to 13 of the present invention was tested according to the requirements of the test protocol for road engineering asphalt and asphalt mixtures (JTGE 20-2011), and the results are shown in table 3.
TABLE 3
From the results in table 3, it is understood that the hot mix plant recycling asphalt mixtures prepared in examples 4 to 6 of the present invention are superior to those of comparative examples 1 to 13 in various road surface performances.
Compared with the embodiment 1, the embodiment 2 improves the warm-mixing agent, and the performance of each pavement is improved; compared with the example 2, the example 3 further improves the rutting resistance, the low-temperature crack resistance and the strength of the old aggregate by treating the surface of the old aggregate, but reduces the water stability and shows that the anti-stripping effect is weakened. On the basis of the embodiment 3, the zeolite powder is introduced into the surface treatment of the old aggregate in the embodiment 4, so that the adhesion between the old aggregate and asphalt is enhanced, the anti-stripping effect is improved, the water stability is improved, and the performances of other pavements are further improved.
Compared with the embodiment 4, the comparative examples 1 to 3 respectively change the warm-mixing agent or the preparation method; compared with example 5, comparative examples 3 to 12 respectively change the surface treatment mode of the old aggregate; in contrast to example 6, comparative example 13 was not treated with sodium lignosulfonate. As a result, the road surface properties of comparative examples 1 to 13 were all degraded.
2. Defoaming effect of warm mixing agent prepared by the invention
The defoaming performance of the warm-mix agents prepared in examples 1 and 4 to 6 of the present invention and comparative examples 1 and 2 was measured, and the amount of bubbles at the time of discharging the reclaimed asphalt mixture prepared in the present invention was observed, and the results are shown in table 4.
TABLE 4
As is clear from table 4, in examples 4 to 6 of the present invention, the defoaming effect was more remarkable and the amount of bubbles in the asphalt mixture could be reduced after the defoaming function of the warm-mix agent was improved, as compared with example 1 and comparative examples 1 and 2.
The invention has the beneficial effects that: according to the high-doping-amount plant-mixed hot-recycling asphalt mixture and the preparation method and application thereof, the road performance and the stability of the high-doping-amount plant-mixed hot-recycling asphalt mixture are comprehensively improved by improving the surface activity and the defoaming function of the warm-mixing agent and carrying out surface treatment on old aggregates in RAP materials.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or some technical features thereof can be replaced. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A high-mixing-amount plant-mixed hot recycled asphalt mixture is characterized in that: comprises the following components in parts by mass: 60-80 parts of recycled asphalt pavement materials, 2-4 parts of fresh asphalt, 15-25 parts of fresh aggregates, 12-20 parts of regenerant, 6-8 parts of warm mixing agent, 3-5 parts of mineral powder, 2-4 parts of viscosity reducer, 1-3 parts of styrene-butadiene latex and 1-2 parts of reinforcing fibers;
the preparation method of the warm mixing agent comprises the following steps:
(1) Evenly mixing hydrogen-terminated silicone oil and a platinum catalyst, then dripping the mixture into divinyl glycol under the stirring condition at the temperature of between 70 and 90 ℃, and reacting for 4 to 6 hours to obtain an addition product;
(2) Oxidizing hydroxyl in the addition product into carboxyl under the condition of an acidic potassium permanganate solution, and stirring and reacting the obtained oxidation product and 18-hydroxyoctadecanoic acid for 5-6 hours at the temperature of 90-110 ℃ under the catalysis of concentrated sulfuric acid to obtain an esterification product;
(3) And (3) mixing the esterification product, chitosan and dichloromethane, then dripping dichloromethane solution of DCC/DMAP at the temperature of 10-40 ℃, and stirring and reacting for 6-12 hours to obtain the warm mixing agent.
2. The high mix hot mix plant mix reclaimed asphalt mixture according to claim 1, wherein: the novel asphalt is SBS modified asphalt, the novel aggregate is basalt or limestone with the particle size of 1-10 mm, the regenerant is aromatic oil, the mineral powder is limestone mineral powder or blast furnace slag, the viscosity reducer is EC-120, and the reinforcing fiber is lignin fiber, carbon fiber or polyester fiber.
3. The high mix hot mix plant mix reclaimed asphalt mixture according to claim 1, wherein: the mol ratio of the hydrogen-terminated silicone oil, the divinyl glycol, the 18-hydroxy octadecanoic acid and the chitosan is (2.1-2.2): 1: (1.1-2.3): (1.1-2.3).
4. The high-volume hot mix plant mix recycled asphalt mixture according to claim 1, wherein: in the step (1), the platinum catalyst is chloroplatinic acid or Karsted platinum catalyst, and the addition amount of the platinum catalyst is 3-20 ppm calculated by platinum;
in the step (4), the molar ratio of the esterification product to the chitosan to the DCC to DMAP is 1: (1.1-1.3): (1.2-1.4): (0.1-0.2).
5. The preparation method of the high-volume hot mix plant-mixed recycled asphalt mixture according to claim 1, which is characterized by comprising the following steps of: the method comprises the following steps:
s1, separating old asphalt and old aggregates in the asphalt pavement reclaimed materials by adopting an extraction test, measuring the mass content of the old asphalt, performing a screening test on the old aggregates, testing the original gradation of the asphalt pavement reclaimed materials, performing gradation synthesis on the asphalt pavement reclaimed materials, new aggregates and mineral powder, and determining the using amount of the new asphalt by a Marshall test;
s2, dividing the screened old aggregates into old aggregates which pass through a 2.36mm screen and old aggregates which do not pass through the 2.36mm screen, spraying an expansive material on the surfaces of the old aggregates which pass through the 2.36mm screen, and spraying a separation material on the surfaces of the old aggregates which do not pass through the 2.36mm screen to finish the surface treatment of the old aggregates;
s3, mixing the old asphalt, the old aggregate which does not pass through a 2.36mm screen, the new asphalt, the new aggregate and the regenerant for 40-60S at 120-130 ℃, then adding a warm mixing agent, styrene-butadiene latex and reinforcing fibers, cooling to 95-120 ℃, and continuously mixing for 50-75S;
and S4, cooling to 70-90 ℃, adding the old aggregate passing through the 2.36mm screen mesh, stirring for 20-40S, then heating to 100-120 ℃, and continuously stirring for 10-20S to obtain a finished product of the regenerated asphalt mixture.
6. The preparation method of the high-volume hot mix plant recycling asphalt mixture according to claim 5, characterized by comprising the following steps: the raw material composition of the expandable material comprises: 6-10 parts of polymethyl methacrylate, 3-6 parts of polypropylene, 5-8 parts of nylon, 2-4 parts of vermiculite powder, 2-5 parts of sodium silicate and 3-6 parts of calcium chloride; the isolation material comprises the following raw materials in percentage by mass of 1: (5-10).
7. The preparation method of the high-volume hot mix plant recycling asphalt mixture according to claim 5, characterized by comprising the following steps: the spraying method of the expansion material comprises the following steps: firstly, mixing vermiculite powder, sodium silicate and water to prepare a first mixture, mixing calcium chloride and water to prepare a second mixture, simultaneously spraying the first mixture and the second mixture on the surface of old aggregate passing through a 2.36mm screen mesh, and drying; melting and mixing polymethyl methacrylate, polypropylene and nylon at 180-200 ℃ to obtain a mixture III, then spraying the mixture III onto the surface of the old aggregate passing through a 2.36mm screen mesh, and cooling and drying the mixture to obtain the composite material;
the spraying method of the isolating material comprises the following steps: the polystyrene and the acetone are mixed evenly and then directly sprayed, and the spraying amount is 0.5 to 2 percent.
8. The preparation method of the high-content hot mix plant-mixed recycled asphalt mixture according to claim 7, characterized by comprising the following steps: the adding amount of the water in the first mixed solution is 6-12 times of that of the sodium silicate, the adding amount of the water in the second mixed solution is 5-10 times of that of the calcium chloride, and the spraying amounts of the first mixed solution and the third mixed solution are 0.2-0.4%, 0.1-0.2% and 0.4-0.8% respectively.
9. The preparation method of the high-content hot mix plant-mix recycled asphalt mixture according to any one of claims 6 to 8, which is characterized by comprising the following steps: the raw material of the expandable material also comprises 4-7 parts of zeolite powder, and the zeolite powder is melted and mixed with polymethyl methacrylate, polypropylene and nylon at 180-200 ℃ to form a mixture III; the insulating material also comprises zeolite powder, wherein the mass ratio of the polystyrene to the zeolite powder is 1: (0.05-0.1); the zeolite powder is used after being treated as follows: soaking zeolite powder in sodium lignosulphonate solution for 1-2 h, and then evaporating water, wherein the mass ratio of the zeolite powder to the sodium lignosulphonate is 1: (0.04-0.08).
10. Use of the high mix hot mix plantmix reclaimed asphalt mixture according to claim 1 in road construction.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116514464A (en) * | 2023-04-27 | 2023-08-01 | 重庆交通大学 | Reflective cement mucilage and reflective semi-flexible pavement material |
| CN117658530A (en) * | 2023-12-06 | 2024-03-08 | 淮南市中岩新型建材有限公司 | Processing technology of environment-friendly anti-cracking color recycled asphalt concrete |
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| US4373961A (en) * | 1981-10-13 | 1983-02-15 | Penelizer Corporation | Process and composition for use in recycling of old asphalt pavements |
| CN105906235A (en) * | 2016-04-19 | 2016-08-31 | 中交瑞通路桥养护科技有限公司 | An electromagnetic induction type thermally dispersed PAN-PE composite modified stone mastic asphalt material, a preparing method thereof and a constructing method of the material |
| CN112174576A (en) * | 2020-09-11 | 2021-01-05 | 重庆质能环保科技有限公司 | Plant-mixed hot recycled asphalt mixture and processing method thereof |
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| US4373961A (en) * | 1981-10-13 | 1983-02-15 | Penelizer Corporation | Process and composition for use in recycling of old asphalt pavements |
| CN105906235A (en) * | 2016-04-19 | 2016-08-31 | 中交瑞通路桥养护科技有限公司 | An electromagnetic induction type thermally dispersed PAN-PE composite modified stone mastic asphalt material, a preparing method thereof and a constructing method of the material |
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| CN116514464A (en) * | 2023-04-27 | 2023-08-01 | 重庆交通大学 | Reflective cement mucilage and reflective semi-flexible pavement material |
| CN117658530A (en) * | 2023-12-06 | 2024-03-08 | 淮南市中岩新型建材有限公司 | Processing technology of environment-friendly anti-cracking color recycled asphalt concrete |
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