CN115385607B - 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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- 239000000203 mixture Substances 0.000 title claims abstract description 173
- 239000010426 asphalt Substances 0.000 title claims abstract description 147
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
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- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004816 latex Substances 0.000 claims abstract description 12
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- 238000002156 mixing Methods 0.000 claims description 52
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 24
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- 238000001816 cooling Methods 0.000 description 16
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 16
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- 238000012360 testing method Methods 0.000 description 15
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- 239000010455 vermiculite Substances 0.000 description 13
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- 235000019354 vermiculite Nutrition 0.000 description 13
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 description 12
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- 238000007599 discharging Methods 0.000 description 2
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- 125000000467 secondary amino group Chemical group [H]N([*:1])[*:2] 0.000 description 2
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- 101000638161 Homo sapiens Tumor necrosis factor ligand superfamily member 6 Proteins 0.000 description 1
- 102100031988 Tumor necrosis factor ligand superfamily member 6 Human genes 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical group [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
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- 239000004094 surface-active agent Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- 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-mixing-amount plant-mixed hot recycled asphalt mixture, and a preparation method and application thereof, wherein the asphalt mixture comprises the following components in parts by mass: 60-80 parts of asphalt pavement reclaimed materials, 2-4 parts of new asphalt, 15-25 parts of new aggregates, 12-20 parts of regenerants, 6-8 parts of warm mix agents, 3-5 parts of mineral powder, 2-4 parts of viscosity reducers, 1-3 parts of styrene-butadiene latex and 1-2 parts of reinforcing fibers. The high-doping amount plant-mixed hot recycled asphalt mixture provided by the invention can effectively improve the road performance and the stability of the RAP material under high doping amount.
Description
Technical Field
The invention belongs to the technical field of reclaimed asphalt mixtures, and particularly relates to a high-mixing-amount hot-mix plant reclaimed asphalt mixture, and a preparation method and application thereof.
Background
At present, the mixing amount of RAP (asphalt pavement reclaimed materials) in the hot mix plant recycled asphalt mixture is in the range of 10-30% which is a relatively mature technology, and the mixing amount is more than 30% which is a high mixing amount. The research of high-mixing-amount plant-mixed hot recycled asphalt mixture in China is in a starting stage, and in view of the complexity of RAP materials, the current obstacle of increasing the mixing amount of the RAP materials mainly comprises technical standards, variability, recording performance limitation and the like. Therefore, the control of the quality stability of the RAP material is critical.
The plant-mixed thermal regeneration is to dig the old asphalt pavement, convey the old asphalt pavement back to a mixing plant, intensively crush the old asphalt pavement, perform proportioning design according to quality requirements of different layers of the pavement, determine the adding proportion of the old asphalt mixture, and mix the regenerant, the new asphalt material, the new aggregate and the like in a mixer again according to a certain proportion to form the new mixture, thereby obtaining the excellent regenerated asphalt concrete and paving the regenerated asphalt pavement. The plant-mixed hot recycling needs to mix asphalt mixture at a higher temperature, and the discharging temperature of the recycled asphalt mixture is usually 5-15 ℃ higher than that of the common hot-mixed asphalt mixture, so that the processing temperature of the RAP material is higher, the secondary aging of asphalt in the RAP material is aggravated, and the performance of the recycled asphalt mixture is influenced.
In order to reduce secondary aging of asphalt in the RAP material, a warm mixing agent is needed to be added to reduce the construction temperature of the RAP material, the warm mixing agent is a surfactant and acts together with other easily-bubble substances in the asphalt mixture, so that bubbles in the mixture are increased and are difficult to foam, the performance of the mixture is influenced, and in addition, the consumption and stability test of the anti-foaming agent are needed to be adjusted, so that the operation is complicated.
In addition, after long-time use, the old aggregate is also seriously damaged or even cracked to influence the strength of the RAP material, and old asphalt is adhered to the surface of the old aggregate to influence the dispersibility of the RAP material in the reclaimed asphalt mixture, so that variability is added to the improvement of the mixing amount of the RAP material.
In summary, how to design a high-mixing-amount plant-mixed hot recycled asphalt mixture, which can effectively improve the road performance and the stability of the RAP material under high mixing amount is a problem which needs to be solved at present.
Disclosure of Invention
The invention aims to solve the technical problems and provide a high-mixing-amount plant-mixed hot-recycled asphalt mixture, a preparation method and application thereof, and the road performance and the stability of the high-mixing-amount plant-mixed hot-recycled asphalt mixture are comprehensively improved by improving the surface activity and defoaming function of a warm mix agent and performing surface treatment on old aggregates in an RAP material.
The invention realizes the above purpose through the following technical scheme:
the high-mixing-amount plant-mixed hot recycled asphalt mixture comprises the following components in parts by mass: 60-80 parts of asphalt pavement reclaimed materials, 2-4 parts of new asphalt, 15-25 parts of new aggregates, 12-20 parts of regenerants, 6-8 parts of warm mix agents, 3-5 parts of mineral powder, 2-4 parts of viscosity reducers, 1-3 parts of styrene-butadiene latex and 1-2 parts of reinforcing fibers.
The preparation method of the warm mix agent comprises the following steps:
(1) Uniformly mixing terminal hydrogen-containing silicone oil and a platinum catalyst, then dripping the mixture into divinyl glycol at 70-90 ℃ under stirring, and reacting for 4-6 hours to obtain an addition product;
(2) Oxidizing hydroxyl in the addition product into carboxyl under the condition of acidic potassium permanganate solution, stopping the reaction until the color of the potassium permanganate is removed, washing with water to remove impurities, and stirring the obtained oxidation product and 18-hydroxyoctadecanoic acid under the catalysis of concentrated sulfuric acid (the addition amount is 0.3-0.5%) at 90-110 ℃ for 5-6 hours to obtain an esterification product;
(3) Mixing the esterified product, chitosan and dichloromethane (the addition amount of which is 3-6 times of that of the esterified product and the chitosan), then dropwise adding a dichloromethane (the addition amount of which is 2-4 times of that of DCC and DMAP) solution of DCC (N, N' -dicyclohexylcarbodiimide)/DMAP (4-dimethylaminopyridine) at the temperature of 10-40 ℃, and stirring and reacting for 6-12 h to obtain the warm mix agent.
Further, the asphalt pavement reclaimed materials are 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 hydrocarbon 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 molar ratio of the hydrogen-containing 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 calstert 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 mol ratio of the esterification product, chitosan, DCC and 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-mixing-amount plant-mixed hot recycled asphalt mixture, which comprises the following steps:
s1, separating old asphalt and old aggregate in the asphalt pavement reclaimed material by adopting an extraction test, measuring the mass content of the old asphalt, screening the old aggregate, checking the original grading of the asphalt pavement reclaimed material, grading the asphalt pavement reclaimed material, new aggregate and mineral powder to form, and determining the new asphalt dosage by a Marshall test;
s2, separating the sieved old aggregate into the old aggregate (fine aggregate) passing through a 2.36mm screen and the old aggregate (coarse 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 insulating 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 old asphalt, old aggregate which does not pass through a 2.36mm screen, new asphalt, new aggregate and regenerant at the temperature of 120-130 ℃ for 40-60S, then adding warm mix agent, styrene-butadiene latex and reinforcing fiber, cooling to 95-120 ℃ and continuously mixing for 50-75S;
s4, cooling to 70-90 ℃, adding the old aggregate passing through a 2.36mm screen, mixing for 20-40S, then heating to 100-120 ℃ and continuously mixing for 10-20S, thus obtaining the regenerated asphalt mixture finished product.
Further, the raw material composition of the expandable material includes: 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 insulating material comprises polystyrene and acetone in a mass ratio of 1: (5-10).
Further, the spraying method of the expansion material comprises the following steps: mixing vermiculite powder, sodium silicate and water to prepare a first mixture, mixing calcium chloride and water to prepare a second mixture, spraying the first mixture and the second mixture on the surface of the old aggregate passing through a 2.36mm screen, and drying; and (3) melting and mixing polymethyl methacrylate, polypropylene and nylon at 180-200 ℃ to form a mixture III, spraying the mixture III on the surface of the old aggregate passing through a 2.36mm screen, and cooling and drying the mixture III.
The spraying method of the insulating material comprises the following steps: the polystyrene and the acetone are directly sprayed after being uniformly mixed, and the spraying amount is 0.5-2 percent.
Further, the addition of the water in the first mixed solution is 6-12 times of that of sodium silicate, the addition of the water in the second mixed solution is 5-10 times of that of calcium chloride, and the spraying amount of the mixture I and the mixture II and the spraying amount of the mixture III are respectively 0.2-0.4%, 0.1-0.2% and 0.4-0.8%.
Further, the raw materials of the expansion material also comprise 4-7 parts of zeolite powder, and the zeolite powder, polymethyl methacrylate, polypropylene and nylon are melted and mixed at 180-200 ℃ to form a mixture III; the raw materials of the insulating material also comprise zeolite powder, and the mass ratio of polystyrene to zeolite powder is 1: (0.05-0.1).
Further, the zeolite powder is reused after the following treatments: soaking zeolite powder in sodium lignin sulfonate solution for 1-2 h, and evaporating water to obtain the product, wherein the mass ratio of the zeolite powder to the sodium lignin sulfonate is 1: (0.04-0.08).
The invention also provides application of the high-mixing-amount 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 asphalt mixture and improves the road performance, but also has the defoaming function.
(2) According to the warm mix agent prepared by the invention, through grafting hydrogen-containing silicone oil on two vinyl groups of divinyl glycol and sequentially grafting 18-hydroxyoctadecanoic acid and chitosan on the other two hydroxyl groups after oxidizing into carboxyl groups, the whole warm mix agent simultaneously contains hydrophilic secondary amino groups, chitosan, lipophilic long-chain alkane and defoaming silicon-oxygen chain segments, and has good surface activity and defoaming effect.
(3) The warm mix agent prepared by the invention has strong surface activity, can enhance the adhesiveness of asphalt and aggregate, and has good anti-stripping effect.
(4) According to the invention, the old aggregate is divided into coarse aggregate and fine aggregate according to the particle size, and the polystyrene material is sprayed on the surface of the coarse aggregate, so that the old asphalt on the surface of the coarse aggregate is prevented from affecting the dispersion, and the strength of the coarse aggregate can be enhanced while the isolation is formed; as the fine aggregate is generally inlaid in the gaps among the coarse aggregates, the invention can generate fine expansion in the subsequent use process after the surface of the fine aggregate is sprayed with the expansive material, reduce the gaps and strengthen the structural stability of the fine aggregate and the coarse aggregate.
(5) When the invention sprays the expansive material to the fine aggregate, the vermiculite powder is firstly guided into the gaps of the fine aggregate through the action of sodium silicate and calcium chloride, and then polymethyl methacrylate, polypropylene and nylon are sprayed, so that the fine aggregate not only has the structure enhancement, but also has the expansion compensation effect.
(6) The invention also adds zeolite powder into the material sprayed on the surface of the old aggregate, the warm mix agent contains alkaline secondary amino, and the zeolite powder is porous acid rock, so the warm mix agent can form adsorption with the surface of the old aggregate, and the anti-stripping effect of the warm mix agent is enhanced.
(7) The zeolite powder is also treated with sodium lignin sulfonate, and as the warm mix agent contains hydrophilic chitosan, the chitosan contains positive charge groups, and the sodium lignin sulfonate contains negative charge groups, the anti-stripping effect of the warm mix agent is further promoted.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The RAP materials used in the following examples or comparative examples are AC-13 asphalt pavement planing and milling materials with the same source and the same particle size.
Example 1
Firstly, sampling asphalt pavement reclaimed materials, separating old asphalt and old aggregate in the RAP materials by adopting an extraction test, testing to obtain the mass content of the old asphalt in the RAP materials as 3.5%, 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 requirements of highway engineering asphalt and asphalt mixture test procedure (JTGE 20-2011) and highway engineering aggregate test procedure (JTGE 42), wherein the results are shown in tables 1 and 2.
TABLE 1 mineral aggregate grading and relative Density of old aggregate in New aggregate and RAP Material
TABLE 2 Performance index of old asphalt in New asphalt, RAP Material
The RAP material, the new aggregate and the mineral powder are graded and synthesized, the new asphalt dosage is determined by a Marshall test, and both the synthesis grading and the Marshall test meet the requirements of the Highway asphalt pavement construction technical Specification (JTG F40-2004).
The high-mixing-amount plant-mixed hot recycled 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 mix 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 derived 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 regenerant is aromatic oil, the warm-mix agent is APTL/01 warm-mix 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-mixing-amount plant-mixed hot recycled asphalt mixture comprises the following steps:
s1, separating old asphalt and old aggregate in the asphalt pavement reclaimed material by adopting an extraction test, measuring the mass content of the old asphalt, screening the old aggregate, checking the original grading of the asphalt pavement reclaimed material, grading the asphalt pavement reclaimed material, new aggregate and mineral powder to form, and determining the new asphalt dosage by a Marshall test;
s2, mixing the old asphalt, the old aggregate, the new asphalt, the new aggregate and the regenerant at 120 ℃ for 40S, then adding the warm mix agent, the styrene-butadiene latex and the reinforcing fiber, and cooling to 95 ℃ and continuously mixing for 50S to obtain a regenerated asphalt mixture finished product.
Example 2
The embodiment provides a high-mixing-amount plant-mixed hot-recycled asphalt mixture, which is prepared by the following steps of:
(1) Uniformly mixing terminal hydrogen-containing silicone oil (the hydrogen content is 3%, the viscosity is 20 cs) and a platinum catalyst (chloroplatinic acid catalyst, the addition amount of which is 3ppm based on platinum), then dripping the mixture into divinyl glycol at 70 ℃ under stirring, and reacting for 4 hours to obtain an addition product;
(2) Oxidizing hydroxyl in the addition product into carboxyl under the condition of acidic potassium permanganate solution (the concentration is 0.5%), stopping the reaction until the color of the potassium permanganate is removed, washing with water to remove impurities, and stirring the obtained oxidation product and 18-hydroxyoctadecanoic acid under the catalysis of concentrated sulfuric acid (the addition amount is 0.3%) at 90 ℃ for 5 hours to obtain an esterification product; the molar ratio of potassium permanganate to addition product is 2:1;
(3) Mixing the esterified product, chitosan and dichloromethane (the addition amount of which is 3 times of that of the esterified product and the chitosan), then dropwise adding a dichloromethane (the addition amount of which is 2 times of that of DCC and DMAP) solution of DCC (N, N' -dicyclohexylcarbodiimide)/DMAP (4-dimethylaminopyridine) at 10 ℃, and stirring and reacting for 6 hours to obtain the warm mix agent. The mol ratio of the esterification product, chitosan, DCC and DMAP is 1:1.1:1.2:0.1.
the molar ratio of the hydrogen-containing silicone oil, the divinyl glycol, the 18-hydroxyoctadecanoic acid and the chitosan is 2.1:1:1.1:1.1.
the remainder was the same as in example 1.
Example 3
On the basis of the embodiment 2, the embodiment provides a high-mixing-amount plant-mixed hot recycled asphalt mixture, which is prepared by the following steps:
s1, separating old asphalt and old aggregate in the asphalt pavement reclaimed material by adopting an extraction test, measuring the mass content of the old asphalt, screening the old aggregate, checking the original grading of the asphalt pavement reclaimed material, grading the asphalt pavement reclaimed material, new aggregate and mineral powder to form, and determining the new asphalt dosage by a Marshall test;
s2, dividing the sieved old aggregate into the old aggregate passing through a 2.36mm screen and the 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 insulating 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 old asphalt, old aggregate which does not pass through a 2.36mm screen, new asphalt, new aggregate and regenerant at 120 ℃ for 40S, then adding warm mix agent, styrene-butadiene latex and reinforcing fiber, cooling to 95 ℃ and continuously mixing for 50S;
s4, cooling to 70 ℃, adding the old aggregate passing through a 2.36mm screen, stirring for 20S, then heating to 100 ℃ and continuously stirring for 10S, thus obtaining the regenerated asphalt mixture finished product.
The raw material composition of the swelling 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: mixing vermiculite powder, sodium silicate and water to prepare a first mixture, mixing calcium chloride and water to prepare a second mixture, spraying the first mixture and the second mixture on the surface of the old aggregate passing through a 2.36mm screen, and drying; and (3) melting and mixing polymethyl methacrylate, polypropylene and nylon at 180 ℃ to form a mixture III, spraying the mixture III onto the surface of the old aggregate passing through a 2.36mm screen, and cooling and drying the mixture III.
The adding amount of water in the first mixed solution is 6 times of that of sodium silicate, the adding amount of water in the second mixed solution is 5 times of that of calcium chloride, and the spraying amount of the mixture I and the mixture II is 0.2%, 0.1% and 0.4% respectively.
The insulating material comprises polystyrene and acetone in a mass ratio of 1:5.
the spraying method of the insulating material comprises the following steps: the polystyrene and the acetone are directly sprayed after being uniformly mixed, and the spraying amount is 0.5 percent.
The remainder was the same as in example 2.
Example 4
On the basis of the embodiment 3, the embodiment provides a high-mixing-amount hot-mix plant recycled asphalt mixture, and the preparation method of the recycled asphalt mixture comprises the steps of dividing the sieved old aggregate into the old aggregate passing through a 2.36mm screen and the 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 insulating material on the surface of the old aggregate not passing through the 2.36mm screen to finish the surface treatment of the old aggregate.
The raw materials of the swelling 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: mixing vermiculite powder, sodium silicate and water to prepare a first mixture, mixing calcium chloride and water to prepare a second mixture, spraying the first mixture and the second mixture on the surface of the old aggregate passing through a 2.36mm screen, and drying; and (3) melting and mixing polymethyl methacrylate, polypropylene, nylon and zeolite powder at 180 ℃ to form a mixture III, spraying the mixture III onto the surface of the old aggregate passing through a 2.36mm screen, and cooling and drying the mixture III.
The raw materials of the insulating material are as follows: polystyrene, acetone and zeolite powder, wherein the mass ratio of the polystyrene to the acetone to the zeolite powder is 1:5:0.05.
the zeolite powder is reused after the following treatment: soaking zeolite powder in sodium lignin sulfonate solution for 1h, and evaporating water to obtain the product, wherein the mass ratio of the zeolite powder to the sodium lignin sulfonate is 1:0.04.
the remainder was the same as in example 3.
Example 5
The embodiment provides a high-mixing-amount plant-mixed hot recycled 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 mix agent, 4 parts of mineral powder, 3 parts of viscosity reducer, 2 parts of styrene-butadiene latex and 1.5 parts of reinforcing fiber. The RAP material is derived from an AC-20 asphalt pavement, and the reinforcing fiber is carbon fiber.
The preparation method of the warm mix agent comprises the following steps:
(1) Uniformly mixing terminal hydrogen-containing silicone oil (hydrogen content is 4%, viscosity is 30 cs) and a platinum catalyst (chloroplatinic acid catalyst, the addition amount of which is 12ppm based on platinum), then dripping the mixture into divinyl glycol at 80 ℃ under stirring, and reacting for 5 hours to obtain an addition product;
(2) Oxidizing hydroxyl in the addition product into carboxyl under the condition of acidic potassium permanganate solution (the concentration is 2%), stopping the reaction until the color of potassium permanganate is removed, washing with water to remove impurities, and stirring the obtained oxidation product and 18-hydroxyoctadecanoic acid under the catalysis of concentrated sulfuric acid (the addition amount is 0.4%) at the temperature of 100 ℃ for 5.5 hours to obtain an esterification product; the molar ratio of potassium permanganate to addition product is 4:3.5;
(3) Mixing the esterified product, chitosan and dichloromethane (the addition amount of which is 4.5 times of the addition amount of the esterified product and the chitosan), then dropwise adding a dichloromethane (the addition amount of which is 3 times of the total amount of DCC and DMAP) solution of DCC/DMAP at 25 ℃, and stirring for reacting for 9 hours to obtain the warm mix agent. The mol ratio of the esterification product, chitosan, DCC and DMAP is 1:1.2:1.3:0.15.
the molar ratio of the hydrogen-containing silicone oil, the divinyl glycol, the 18-hydroxyoctadecanoic acid and the chitosan is 2.15:1:1.7:1.7.
the invention also provides a preparation method of the high-mixing-amount plant-mixed hot recycled asphalt mixture, which comprises the following steps:
s1, separating old asphalt and old aggregate in the asphalt pavement reclaimed material by adopting an extraction test, measuring the mass content of the old asphalt, screening the old aggregate, checking the original grading of the asphalt pavement reclaimed material, grading the asphalt pavement reclaimed material, new aggregate and mineral powder to form, and determining the new asphalt dosage by a Marshall test;
s2, dividing the sieved old aggregate into the old aggregate passing through a 2.36mm screen and the 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 insulating 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 old asphalt, old aggregate which does not pass through a 2.36mm screen, new asphalt, new aggregate and regenerant for 50S at 125 ℃, adding warm mix agent, styrene-butadiene latex and reinforcing fiber, cooling to 105 ℃, and continuously mixing for 60S;
s4, cooling to 80 ℃, adding the old aggregate passing through a 2.36mm screen, stirring for 30S, then heating to 110 ℃, and continuously stirring for 15S to obtain a regenerated asphalt mixture finished product.
The raw materials of the swelling 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: mixing vermiculite powder, sodium silicate and water to prepare a first mixture, mixing calcium chloride and water to prepare a second mixture, spraying the first mixture and the second mixture on the surface of the old aggregate passing through a 2.36mm screen, and drying; and (3) melting and mixing polymethyl methacrylate, polypropylene, nylon and zeolite powder at 190 ℃ to form a mixture III, spraying the mixture III onto the surface of the old aggregate passing through a 2.36mm screen, and cooling and drying the mixture III.
The adding amount of water in the first mixed solution is 9 times of that of sodium silicate, the adding amount of water in the second mixed solution is 7.5 times of that of calcium chloride, and the spraying amount of the mixture I and the mixture II is 0.3%, 0.15% and 0.6% respectively.
The raw materials of the insulating material are as follows: polystyrene, acetone and zeolite powder, wherein the mass ratio of the polystyrene to the acetone to the zeolite powder is 1:7.5:0.07.
the spraying method of the insulating material comprises the following steps: the polystyrene and the acetone are directly sprayed after being uniformly mixed, and the spraying amount is 1.2 percent.
The zeolite powder is reused after the following treatment: soaking zeolite powder in sodium lignin sulfonate solution for 1.5h, and evaporating water to obtain the product, wherein the mass ratio of the zeolite powder to the sodium lignin sulfonate is 1:0.06.
the remainder was the same as in example 4.
Example 6
The embodiment provides a high-mixing-amount plant-mixed hot recycled 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 mix 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 derived 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 reinforcing fiber is polyester fiber.
The preparation method of the warm mix agent comprises the following steps:
(1) Uniformly mixing terminal hydrogen-containing silicone oil (the hydrogen content is percent, the viscosity is cs) and a platinum catalyst (a Karste platinum catalyst, the addition amount of which is 20ppm based on platinum), then dripping the mixture into divinyl glycol at 90 ℃ under stirring, 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 (the concentration is 3%), stopping the reaction until the color of the potassium permanganate is removed, washing with water to remove impurities, and stirring the obtained oxidation product and 18-hydroxyoctadecanoic acid under the catalysis of concentrated sulfuric acid (the addition amount is 0.5%) at 110 ℃ for 6 hours to obtain an esterification product; the molar ratio of potassium permanganate to addition product is 4:5, a step of;
(3) Mixing the esterified product, chitosan and dichloromethane (the addition amount of which is 6 times of the addition amount of the esterified product and the chitosan), then dropwise adding a dichloromethane (the addition amount of which is 4 times of the total amount of DCC and DMAP) solution of DCC/DMAP at 10-40 ℃, and stirring for reacting for 12 hours to obtain the warm mix agent. The mol ratio of the esterification product, chitosan, DCC and DMAP is 1:1.3:1.4:0.2.
the molar ratio of the hydrogen-containing 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-mixing-amount plant-mixed hot recycled asphalt mixture, which comprises the following steps:
s1, separating old asphalt and old aggregate in the asphalt pavement reclaimed material by adopting an extraction test, measuring the mass content of the old asphalt, screening the old aggregate, checking the original grading of the asphalt pavement reclaimed material, grading the asphalt pavement reclaimed material, new aggregate and mineral powder to form, and determining the new asphalt dosage by a Marshall test;
s2, dividing the sieved old aggregate into the old aggregate passing through a 2.36mm screen and the 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 insulating 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 old asphalt, old aggregate which does not pass through a 2.36mm screen, new asphalt, new aggregate and regenerant at 130 ℃ for 60 seconds, then adding warm mix agent, styrene-butadiene latex and reinforcing fiber, cooling to 120 ℃ and continuously mixing for 75 seconds;
s4, cooling to 90 ℃, adding the old aggregate passing through a 2.36mm screen, stirring for 40S, then heating to 120 ℃ and continuously stirring for 20S, thus obtaining the regenerated asphalt mixture finished product.
The raw materials of the swelling 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: mixing vermiculite powder, sodium silicate and water to prepare a first mixture, mixing calcium chloride and water to prepare a second mixture, spraying the first mixture and the second mixture on the surface of the old aggregate passing through a 2.36mm screen, and drying; and (3) melting and mixing polymethyl methacrylate, polypropylene, nylon and zeolite powder at 200 ℃ to form a mixture III, spraying the mixture III on the surface of the old aggregate passing through a 2.36mm screen, and cooling and drying the mixture III.
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 amount of the mixture I and the mixture II is 0.4%, 0.2% and 0.8% respectively.
The raw materials of the insulating material are as follows: polystyrene, acetone and zeolite powder, wherein the mass ratio of the polystyrene to the acetone to the zeolite powder is 1:10:0.1.
the spraying method of the insulating material comprises the following steps: polystyrene and acetone are mixed uniformly and then sprayed directly, and the spraying amount is 2%.
The zeolite powder is reused after the following treatment: soaking zeolite powder in sodium lignin sulfonate solution for 2h, and evaporating water to obtain the product, wherein the mass ratio of the zeolite powder to the sodium lignin sulfonate is 1:0.08.
the remainder was the same as in example 4.
Comparative example 1
The difference between this comparative example and example 4 is that the warm mix agent preparation step does not include step (1), i.e., no introduction of the terminal hydrogen-containing silicone oil, and directly uses divinyl glycol as the starting reactant.
Comparative example 2
This comparative example differs from example 5 in that the warm mix agent was replaced by silicone oil.
Comparative example 3
The difference between this comparative example and example 4 is that the warm mix preparation step does not include step (3), i.e., no chitosan is introduced.
Comparative example 4
The present comparative example differs from example 5 in that the preparation method of the hot mix plant recycled asphalt mixture does not include steps S2 and S4, i.e., does not include surface treatment of the old aggregate.
Comparative example 5
This comparative example differs from example 5 in that in the preparation method of the hot mix plant recycled asphalt mixture, only the surface treatment of the old aggregate passing through the 2.36mm sieve was performed.
Comparative example 6
The difference between this comparative example and example 5 is that in the method for preparing a hot mix asphalt mixture, only the surface treatment of the old aggregate which did not pass through the 2.36mm sieve was performed.
Comparative example 7
The present comparative example is different from example 5 in that in the preparation method of the hot mix plant recycled asphalt mixture in step S2, the old aggregate obtained by sieving is divided into the old aggregate passing through the 4.75mm sieve and the old aggregate not passing through the 4.75mm sieve.
Comparative example 8
The present comparative example is different from example 5 in that in the preparation method of the hot mix plant recycled asphalt mixture in step S2, the old aggregate obtained by sieving is divided into the old aggregate passing through the 1.18mm sieve and the old aggregate not passing through the 1.18mm sieve.
Comparative example 9
The difference between this comparative example and example 5 is that the preparation method of the hot mix plant recycled asphalt mixture does not include step S4, and step S3 is: mixing old asphalt, old aggregate, new asphalt, new aggregate and regenerant at 125deg.C for 50s, adding warm-mix agent, styrene-butadiene latex and reinforcing fiber, cooling to 105deg.C, and continuously mixing for 60s.
Comparative example 10
This comparative example differs from example 5 in that the intumescent material does not include vermiculite powder.
Comparative example 11
The comparative example differs from example 5 in that sodium silicate and calcium chloride are not included in the intumescent material, and the spraying method of the intumescent material is as follows: mixing vermiculite powder and water, spraying the mixture onto the surface of the old aggregate passing through a 2.36mm screen, and drying; and (3) melting and mixing polymethyl methacrylate, polypropylene, nylon and zeolite powder at 190 ℃, then continuously spraying the mixture onto the surface of the old aggregate passing through a 2.36mm screen, and cooling and drying the mixture.
Comparative example 12
This comparative example differs from example 5 in that polymethyl methacrylate is not included in the intumescent material.
Comparative example 13
The difference between this comparative example and example 6 is that the zeolite powder was not treated with sodium lignin sulfonate.
1. The road performance of the high-mixing-amount plant-mixed hot-recycled asphalt mixture prepared by the invention
The road performance of the high-blend hot mix plant 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 Highway engineering asphalt and asphalt mixture test procedure (JTGE 20-2011), and the results are shown in Table 3.
TABLE 3 Table 3
As is clear from the results in Table 3, the hot-mix plant recycled asphalt mixtures prepared in examples 4 to 6 of the present invention exhibited excellent road surface properties as compared with comparative examples 1 to 13.
Compared with the embodiment 1, the embodiment 2 improves the warm mix agent, and improves various pavement performances; compared with example 2, the surface of the old aggregate is treated in example 3, the rut resistance, the low-temperature cracking resistance and the strength of the old aggregate are further improved, but the water stability of the old aggregate is reduced, and the anti-stripping effect is reduced. On the basis of the embodiment 3, the zeolite powder is introduced in the embodiment 4 when the surface of the old aggregate is treated, 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 other pavement performances are further improved.
Comparative examples 1 to 3 were modified with warm mix agents or preparation methods, respectively, as compared with example 4; comparative examples 3 to 12 respectively changed the surface treatment manner of the old aggregate as compared with example 5; in contrast to example 6, comparative example 13 was not treated with sodium lignin sulfonate. As a result, the road surface properties of comparative examples 1 to 13 were lowered.
2. Defoaming effect of the warm mix agent prepared by the invention
The warm mix prepared in examples 1, 4 to 6 and comparative examples 1 and 2 were tested for defoaming property, and the amount of bubbles when discharging the reclaimed asphalt mixture prepared in the invention was observed, and the results are shown in Table 4.
TABLE 4 Table 4
As is clear from table 4, examples 4 to 6 of the present invention have an obvious defoaming effect after the defoaming function of the warm mix agent is improved, and can reduce the amount of bubbles in the asphalt mixture, as compared with example 1 and comparative examples 1 and 2.
The invention has the beneficial effects that: according to the high-mixing-amount plant-mixed hot-recycled asphalt mixture, the preparation method and the application thereof, the road performance and the stability of the high-mixing-amount plant-mixed hot-recycled asphalt mixture are comprehensively improved through the improvement of the surface activity and the defoaming function of the warm mix agent and the surface treatment of the old aggregate in the RAP material.
Finally, it should be noted that the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited to the above-mentioned embodiment, but may be modified or some of the technical features thereof may be replaced by other technical solutions described in 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 (4)
1. A high-mixing-amount plant-mixed hot recycled asphalt mixture is characterized in that: the preparation method comprises the following preparation raw materials in parts by mass: 60-80 parts of asphalt pavement reclaimed materials, 2-4 parts of new asphalt, 15-25 parts of new aggregate, 12-20 parts of regenerant, 6-8 parts of warm mix 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 fiber;
the preparation method of the warm mix agent comprises the following steps:
(1) Uniformly mixing terminal hydrogen-containing silicone oil and a platinum catalyst, then dripping the mixture into divinyl glycol at 70-90 ℃ under stirring, and reacting for 4-6 hours to obtain an addition product;
(2) Oxidizing hydroxyl in the addition product into carboxyl under the condition of acidic potassium permanganate solution, and stirring the obtained oxidation product and 18-hydroxyoctadecanoic acid at 90-110 ℃ under the catalysis of concentrated sulfuric acid for 5-6 h to obtain an esterification product;
(3) Mixing the esterified product, chitosan and dichloromethane, then dropwise adding a dichloromethane solution of DCC/DMAP at 10-40 ℃, and stirring for reaction for 6-12 h to obtain the warm mixing agent;
the mol ratio of the hydrogen-containing silicone oil at the end, the divinyl glycol, the 18-hydroxyoctadecanoic acid and the chitosan is (2.1-2.2): 1: (1.1-2.3): (1.1-2.3);
the mol ratio of the esterification product, chitosan, DCC and DMAP is 1: (1.1-1.3): (1.2-1.4): (0.1-0.2).
2. The high blend hot mix plant recycling 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 blend hot mix plant recycling asphalt mixture according to claim 1, wherein: in the step (1), the platinum catalyst is chloroplatinic acid or a Carlst platinum catalyst, and the addition amount of the platinum catalyst is 3-20 ppm calculated by platinum.
4. Use of the high-blending-amount hot-mix plant recycled asphalt mixture according to claim 1 in road construction.
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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 |
-
2022
- 2022-09-16 CN CN202211126695.9A patent/CN115385607B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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