CN117383864A - Recycled asphalt concrete and preparation method thereof - Google Patents
Recycled asphalt concrete and preparation method thereof Download PDFInfo
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- CN117383864A CN117383864A CN202311322970.9A CN202311322970A CN117383864A CN 117383864 A CN117383864 A CN 117383864A CN 202311322970 A CN202311322970 A CN 202311322970A CN 117383864 A CN117383864 A CN 117383864A
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- 239000011384 asphalt concrete Substances 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title abstract description 20
- 239000010426 asphalt Substances 0.000 claims abstract description 64
- 239000000203 mixture Substances 0.000 claims abstract description 47
- 239000002699 waste material Substances 0.000 claims abstract description 36
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910017059 organic montmorillonite Inorganic materials 0.000 claims abstract description 20
- 239000006229 carbon black Substances 0.000 claims abstract description 17
- 239000012492 regenerant Substances 0.000 claims abstract description 13
- 239000003381 stabilizer Substances 0.000 claims abstract description 13
- 229920002725 thermoplastic elastomer Polymers 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 11
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 36
- 239000002245 particle Substances 0.000 claims description 35
- 235000019738 Limestone Nutrition 0.000 claims description 21
- 239000006028 limestone Substances 0.000 claims description 21
- 239000011787 zinc oxide Substances 0.000 claims description 18
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 17
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 17
- 239000011347 resin Substances 0.000 claims description 17
- 229920005989 resin Polymers 0.000 claims description 17
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 17
- 239000004698 Polyethylene Substances 0.000 claims description 16
- -1 polyethylene Polymers 0.000 claims description 16
- 229920000573 polyethylene Polymers 0.000 claims description 16
- 229920001400 block copolymer Polymers 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 235000019482 Palm oil Nutrition 0.000 claims description 12
- 239000002540 palm oil Substances 0.000 claims description 12
- 239000011297 pine tar Substances 0.000 claims description 12
- 229940068124 pine tar Drugs 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 229920006465 Styrenic thermoplastic elastomer Polymers 0.000 claims description 4
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 4
- 229920006978 SSBR Polymers 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 2
- 235000013873 oxidized polyethylene wax Nutrition 0.000 claims description 2
- 239000004209 oxidized polyethylene wax Substances 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 239000003784 tall oil Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 2
- 241000872198 Serjania polyphylla Species 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000009044 synergistic interaction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000010257 thawing Methods 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to the technical field of asphalt concrete processing, in particular to recycled asphalt concrete and a preparation method thereof. The raw materials of the recycled asphalt concrete comprise: new aggregate, new asphalt, waste asphalt mixture, regenerant, oxide whisker, organic montmorillonite, carbon black, styrene thermoplastic elastomer and stabilizer. The recycled asphalt concrete provided by the invention has excellent wear resistance and high and low temperature resistance.
Description
Technical Field
The invention relates to the technical field of asphalt concrete processing, in particular to recycled asphalt concrete and a preparation method thereof.
Background
The asphalt pavement can be aged and damaged after being used for a certain time, a large amount of waste asphalt mixture is generated each year by periodically re-paving, the waste asphalt mixture is mainly asphalt cement and aggregate, if the waste asphalt mixture is subjected to landfill treatment, the environment is polluted, a large amount of resources are wasted, and the waste asphalt mixture is reused as an important means for saving resources and preventing environmental pollution.
At present, when the existing waste asphalt mixture is utilized, some inorganic fillers with smaller particle sizes are often added, but the inorganic fillers with smaller particle sizes are easier to cause stress concentration of a system at low temperature, so that the low temperature resistance of the recycled asphalt concrete is poor.
Disclosure of Invention
The invention aims to provide a novel recycled asphalt concrete and a preparation method thereof, wherein the recycled asphalt concrete has excellent wear resistance and high and low temperature resistance.
In order to achieve the above object, a first aspect of the present invention provides a recycled asphalt concrete, wherein the recycled asphalt concrete comprises: new aggregate, new asphalt, waste asphalt mixture, regenerant, oxide whisker, organic montmorillonite, carbon black, styrene thermoplastic elastomer and stabilizer.
The second aspect of the invention provides a preparation method of the recycled asphalt concrete, which comprises the following steps:
(1) Mixing the new aggregate, the oxide whisker and the organic montmorillonite to obtain a first mixed material;
(2) Preheating the waste asphalt mixture and the new asphalt, adding the waste asphalt mixture and the regenerant, the styrene thermoplastic elastomer and the stabilizer into the first mixture, heating and stirring for 30-40min, and finally adding carbon black and stirring for 10-15min.
Compared with the prior art, the invention has at least the following beneficial effects:
1. the recycled asphalt concrete has excellent wear resistance;
2. in the invention, although the oxide whisker and other materials with smaller particle size are used, the defect of low-temperature resistance performance reduction caused by small particle size components can be overcome by the mutual synergistic effect of the raw material components;
3. the recycled asphalt concrete prepared by the mutual synergistic effect of the raw material components has excellent high temperature resistance.
Detailed Description
In order to facilitate understanding of the technical aspects and technical effects of the present invention, the present invention will be described in detail with reference to the following specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, definitions, will control.
The first aspect of the invention provides recycled asphalt concrete, wherein the recycled asphalt concrete comprises the following raw materials: new aggregate, new asphalt, waste asphalt mixture, regenerant, oxide whisker, organic montmorillonite, carbon black, styrene thermoplastic elastomer and stabilizer.
In the invention, the recycled asphalt concrete prepared from the raw materials of the recycled asphalt concrete has excellent wear resistance and high and low temperature resistance.
In some preferred embodiments, the raw materials of the recycled asphalt concrete include, in parts by weight: 50-60 parts of new aggregate, 5-8 parts of new asphalt, 30-40 parts of waste asphalt mixture, 2-3 parts of regenerant, 4-8 parts of oxide whisker, 3-5 parts of organic montmorillonite, 1.5-2 parts of carbon black, 3-5 parts of styrene thermoplastic elastomer and 1.5-2.5 parts of stabilizer.
In the present invention, the inventors have studied and found that the prepared recycled asphalt concrete has more excellent wear resistance and high and low temperature resistance by controlling each raw material component between specific parts by weight.
New aggregate
In some embodiments, the new aggregate comprises limestone and steel slag powder.
In some preferred embodiments, the weight ratio of limestone to steel slag powder is (7-10): 1, for example 7: 1. 8: 1. 9:1 or 10:1.
in the invention, the limestone and steel slag powder are used as new aggregates, and especially the limestone and steel slag powder with a specific proportion are used as the new aggregates, so that the overall performance of the recycled asphalt concrete can be further improved.
In some preferred embodiments, the limestone is a combination of limestone particles ranging in size from (1-3), from (5-8) and from (12-20), preferably in a weight ratio of 1: (0.8-1.2): (0.8-1.2).
In some preferred embodiments, the steel slag powder has a particle size of 4-6mm.
New asphalt
In the invention, the interaction of components such as new asphalt and waste asphalt mixture can better increase the overall performance of the recycled asphalt concrete.
Waste asphalt mixture
The waste asphalt mixture is obtained by digging, recycling, crushing and screening the old asphalt pavement, and the waste asphalt mixture can be crushed and screened into waste asphalt mixtures with different particle sizes according to the requirements, and in some embodiments, the waste asphalt mixture is prepared from old asphalt concrete with the particle size range of 5-8mm, 10-15mm and 20-25mm according to the weight part ratio of 1: (0.8-1.2): (0.8-1.2).
Regenerant
In some embodiments, the regenerant comprises at least one of palm oil, pine tar, tall oil, and rosin resin.
In some preferred embodiments, the regenerant is a combination of palm oil, pine tar and rosin resin, preferably in a weight ratio of 1: (0.8-1.2): (0.5-0.8).
In the present invention, the rosin resin may be a DMER-95 rosin resin.
The invention uses the synergistic interaction of palm oil, pine tar and rosin resin, which can better recover the performance of aged asphalt, and the applicant surprisingly discovers that the addition of the rosin resin can better increase the high temperature resistance of the recycled asphalt concrete, and the inventor speculates that the rosin resin cannot or cannot better increase the high temperature resistance of the recycled asphalt concrete, but the rosin resin has viscosity, has better compatibility with the styrene thermoplastic elastomer, and can improve the adhesiveness of the styrene thermoplastic elastomer in the system, so that the styrene thermoplastic elastomer can better interact with other components in the system.
Oxide whisker
In some embodiments, the oxide whisker is selected from at least one of a magnesium oxide whisker, a manganese oxide whisker, and a zinc oxide whisker.
In some preferred embodiments, the oxide whiskers are zinc oxide whiskers, preferably tetrapod-like zinc oxide whiskers.
In some more preferred embodiments, the tetrapod-like zinc oxide whiskers have a diameter of 0.5 to 5um and a length of 10 to 50um.
In the invention, the inventor finds through a large number of research and development experiments that the addition of oxide whiskers, especially the addition of tetrapod-shaped zinc oxide whiskers, can better increase the wear resistance of recycled asphalt concrete, probably because the tetrapod-shaped zinc oxide whiskers have anisotropism, and can play a good bearing role when the recycled asphalt concrete rubs with other materials to generate wear, so that the wear resistance of a composite material is obviously improved, but in a large number of research and development experiments, the addition amount of the tetrapod-shaped zinc oxide whiskers is required to be strictly controlled, when the addition amount is too large, the wear resistance of the recycled asphalt concrete is reduced, probably because the addition amount of specific tetrapod-shaped zinc oxide whiskers can form similar frameworks in the system, and when the addition amount is increased to a certain extent, the distance between the whiskers is too close, and agglomeration is easy.
Organic montmorillonite
In the invention, the organic montmorillonite has better compatibility with the system, and can better increase the overall performance of the recycled asphalt concrete.
The organic montmorillonite is purchased from Zhejiang Feng iridescent New Material Co., ltd, and the model is DK4.
Carbon black
In some embodiments, the carbon black has a particle size of 20 to 25nm.
Styrenic thermoplastic elastomer
In some embodiments, the styrenic thermoplastic elastomer is selected from at least one of SIS block copolymers, SBS block copolymers, and SSBR.
In some preferred embodiments, the styrenic thermoplastic elastomer is a SIS block copolymer.
The SIS block copolymer of the present invention is identified by the brand name petrochemical Baling 1105 in SIS.
The palm oil and the pine tar in the regenerant have partition effect among macromolecular structures, which breaks nodes of an asphalt network topological structure to reduce the high-temperature performance of the asphalt network topological structure, and the SIS block copolymer has the thermoplasticity and the solubility of plastics, the rebound resilience and the flexibility of polyisoprene rubber, has excellent cohesive force, and simultaneously better improves the high-temperature resistance of the regenerated asphalt concrete under the action of other components in the system.
Stabilizing agent
In some embodiments, the stabilizer is selected from at least one of polyethylene wax, oxidized polyethylene wax, and acrylic modified polyethylene wax, preferably polyethylene wax.
The polyethylene wax of the present invention is of the type U.S./Horniwell A-C316A.
In the invention, the oxide whisker is easier to break under the low temperature condition due to stress concentration, namely, the addition of the oxide whisker weakens the low temperature resistance of the recycled asphalt concrete, but the inventor unexpectedly discovers that the addition of the stabilizer, especially the polyethylene wax, can increase the low temperature resistance of the recycled asphalt concrete, probably because part of the polyethylene wax molecular chain permeates into an asphalt and styrene thermoplastic elastomer molecular chain system, and simultaneously better disperses the oxide whisker, dilutes entanglement of polydiene chain segments to a certain extent, reduces the storage modulus and improves the low temperature flexibility of the system.
The second aspect of the invention provides a preparation method of the recycled asphalt concrete, which comprises the following steps:
(1) Mixing the new aggregate, the oxide whisker and the organic montmorillonite to obtain a first mixed material;
(2) Preheating the waste asphalt mixture and the new asphalt, adding the waste asphalt mixture and the regenerant, the styrene thermoplastic elastomer and the stabilizer into the first mixture, heating and stirring for 30-40min, and finally adding carbon black and stirring for 10-15min.
In the present invention, the manner of mixing in the step (1) is not particularly limited as long as the respective components can be uniformly mixed, for example, at 30 to 50℃for 30 to 60 minutes.
In some embodiments, the temperature of the preheating in step (2) is 130-150 ℃.
In the step (2), the heating temperature is 170-180 ℃.
The present invention is specifically described by way of examples in which the organic montmorillonite is purchased from Zhejiang Feng iridescent New Material Co., ltd., model DK4.
Example 1
Preparation of recycled asphalt concrete raw materials: the preparation method comprises the following steps of: 16 parts of limestone with the particle size of 2mm, 16 parts of limestone with the particle size of 6mm, 16 parts of limestone with the particle size of 15mm, 6 parts of steel slag powder with the particle size of 5mm, 6 parts of new asphalt, 10 parts of waste asphalt mixture with the particle size of 6mm, 12 parts of waste asphalt mixture with the particle size of 12mm, 10 parts of waste asphalt mixture with the particle size of 24mm, 1 part of palm oil, 0.8 part of pine tar, 0.5 part of DMER-95 rosin resin, 6 parts of tetrapod-like zinc oxide whiskers with the diameter of 2um and the length of 20um, 4 parts of organic montmorillonite, 4 parts of carbon black with the particle size of 20nm, 4 parts of SIS block copolymer with the brand name of SIS petrochemical Baling 1105 in SIS, and 2 parts of polyethylene wax of American/Homeviril A-C316A;
preparation of recycled asphalt concrete: mixing all limestone, steel slag powder, tetrapod-like zinc oxide whiskers and organic montmorillonite at 50 ℃ for 40min to obtain a first mixed material; preheating all waste asphalt mixture and new asphalt to 140 ℃, adding the mixture and palm oil, pine tar, DMER-95 rosin resin, SIS block copolymer and polyethylene wax into the first mixture, heating and stirring for 30min at 175 ℃, adding carbon black, stirring for 15min, and discharging to obtain the regenerated asphalt concrete.
Example 2
Preparation of recycled asphalt concrete raw materials: the preparation method comprises the following steps of: 18 parts of limestone with the particle size of 2mm, 16 parts of limestone with the particle size of 6mm, 16 parts of limestone with the particle size of 15mm, 6 parts of steel slag powder with the particle size of 5mm, 6 parts of new asphalt, 15 parts of waste asphalt mixture with the particle size of 5mm, 12 parts of waste asphalt mixture with the particle size of 15mm, 12 parts of waste asphalt mixture with the particle size of 25mm, 1 part of palm oil, 1.2 parts of pine tar, 0.8 part of DMER-95 rosin resin, 8 parts of tetrapod-like zinc oxide whiskers with the diameter of 2um and the length of 20um, 3 parts of organic montmorillonite, 3 parts of carbon black with the particle size of 20nm, 3 parts of SIS block copolymer with the brand of SIS petrochemical Baling 1105 in SIS, and 1.5 parts of polyethylene wax of American/Homevalir A-C316A;
preparation of recycled asphalt concrete: mixing all limestone, steel slag powder, tetrapod-like zinc oxide whiskers and organic montmorillonite at 50 ℃ for 40min to obtain a first mixed material; preheating all waste asphalt mixtures and new asphalt to 150 ℃, adding the mixture and palm oil, pine tar, DMER-95 rosin resin, SIS block copolymer and polyethylene wax into the first mixture, heating and stirring for 30min at 170 ℃, adding carbon black, stirring for 15min, and discharging to obtain the regenerated asphalt concrete.
Example 3
Preparation of recycled asphalt concrete raw materials: the preparation method comprises the following steps of: 20 parts of limestone with the particle size of 2mm, 18 parts of limestone with the particle size of 6mm, 16 parts of limestone with the particle size of 15mm, 6 parts of steel slag powder with the particle size of 5mm, 6 parts of new asphalt, 10 parts of waste asphalt mixture with the particle size of 6mm, 10 parts of waste asphalt mixture with the particle size of 12mm, 10 parts of waste asphalt mixture with the particle size of 24mm, 0.8 part of palm oil, 0.9 part of pine tar, 0.5 part of DMER-95 rosin resin, 4 parts of tetrapod-like zinc oxide whisker with the diameter of 2um and the length of 20um, 5 parts of organic montmorillonite, 5 parts of carbon black with the particle size of 20nm, 5 parts of SIS block copolymer with petrochemical Baling 1105 in SIS and 2.5 parts of polyethylene wax with the brand of American/Homevirol A-C316A;
preparation of recycled asphalt concrete: mixing all limestone, steel slag powder, tetrapod-like zinc oxide whiskers and organic montmorillonite at 50 ℃ for 40min to obtain a first mixed material; preheating all waste asphalt mixtures and new asphalt to 150 ℃, adding the mixture and palm oil, pine tar, DMER-95 rosin resin, SIS block copolymer and polyethylene wax into the first mixture, heating and stirring at 170 ℃ for 40min, adding carbon black, stirring for 10min, and discharging to obtain the regenerated asphalt concrete.
Example 4
The procedure of example 1 was followed, except that: 1.5 parts of palm oil, 0 part of pine tar and 0 part of DMER-95 rosin resin, wherein the DMER-95 rosin resin is not added in the preparation of the recycled asphalt concrete, and the rest is the same as in example 1, so that the recycled asphalt concrete is finally prepared.
Example 5
The procedure of example 1 was followed, except that: the polyethylene wax of U.S. A/Horniwell A-C316A was 0 part, and the polyethylene wax of U.S. A/Horniwell A-C316A was not added in the preparation of the recycled asphalt concrete, and the remainder was the same as in example 1, to finally prepare the recycled asphalt concrete.
Example 6
The procedure of example 1 was followed, except that: the preparation method comprises the steps of (1) preparing recycled asphalt concrete, wherein 0 part of tetrapod-like zinc oxide whisker and 10 parts of organic montmorillonite are adopted, and the remainder is the same as in example 1.
Example 7
The procedure of example 1 was followed, except that: 15 parts of tetrapod-like zinc oxide whisker and the rest of the tetrapod-like zinc oxide whisker are the same as in example 1, and finally the recycled asphalt concrete is prepared.
Example 8
The procedure of example 1 was followed, except that: the amount of SIS block copolymer was 0 part, and the same as in example 1 was repeated except that the SIS block copolymer was not added in the preparation of a recycled asphalt concrete, thereby obtaining a recycled asphalt concrete.
Performance test:
1. abrasion resistance: the recycled asphalt concrete of examples and comparative examples were manufactured into standard road surfaces of the same quality according to the same method, the initial weights of the standard road surfaces were measured and recorded, the rubber wheels of the same specifications and the same surface friction coefficient were used, friction was performed for 20000 times at the same speed, each time for 8 seconds, and then the scraps on the recycled asphalt concrete were removed, and then the differences from the corresponding initial weights were recorded, respectively.
2. Freeze thawing cleavage residual strength ratio: the recycled asphalt concrete in examples and comparative examples was tested according to JTJ052-2000, highway engineering asphalt and asphalt mixture test procedure, T0729-2000, respectively;
3. the high temperature stability of the recycled asphalt concrete in the examples and comparative examples was measured according to the related technical requirements of JTGE20-2011, highway engineering asphalt and asphalt mixture test procedure;
the test results are shown in Table 1.
TABLE 1
As demonstrated by the above examples, the recycled asphalt concrete of the present invention has excellent wear resistance and high and low temperature service resistance.
Claims (10)
1. The recycled asphalt concrete is characterized by comprising the following raw materials: new aggregate, new asphalt, waste asphalt mixture, regenerant, oxide whisker, organic montmorillonite, carbon black, styrene thermoplastic elastomer and stabilizer.
2. The recycled asphalt concrete according to claim 1, wherein the recycled asphalt concrete comprises, in parts by weight: 50-60 parts of new aggregate, 5-8 parts of new asphalt, 30-40 parts of waste asphalt mixture, 2-3 parts of regenerant, 4-8 parts of oxide whisker, 3-5 parts of organic montmorillonite, 1.5-2 parts of carbon black, 3-5 parts of styrene thermoplastic elastomer and 1.5-2.5 parts of stabilizer.
3. The recycled asphalt concrete of claim 1 or 2, wherein the new aggregate comprises limestone and steel slag powder.
4. A recycled asphalt concrete according to claim 3, wherein the limestone is a combination of limestone having a particle size in the range of (1-3), a (5-8) and a (12-20) mm, in a weight ratio of 1: (0.8-1.2): (0.8-1.2); the grain size of the steel slag powder is 4-6mm.
5. The recycled asphalt concrete according to claim 1 or 2, wherein the waste asphalt mixture is prepared from old asphalt concrete with the particle size ranging from 5mm to 8mm, from 10 mm to 15mm and from 20 mm to 25mm in a weight part ratio of 1: (0.8-1.2): (0.8-1.2).
6. The recycled asphalt concrete of claim 1 or 2, wherein the recycling agent comprises at least one of palm oil, pine tar, tall oil, and rosin resin.
7. The recycled asphalt concrete of claim 1 or 2, wherein the oxide whisker is selected from at least one of magnesium oxide whisker, manganese oxide whisker, and zinc oxide whisker.
8. The recycled asphalt concrete according to claim 1 or 2, wherein the styrenic thermoplastic elastomer is selected from at least one of SIS block copolymer, SBS block copolymer and SSBR.
9. The recycled asphalt concrete of claim 1 or 2, wherein the stabilizer is selected from at least one of polyethylene wax, oxidized polyethylene wax, and acrylic-modified polyethylene wax.
10. A method for preparing recycled asphalt concrete according to any one of claims 1 to 9, comprising:
(1) Mixing the new aggregate, the oxide whisker and the organic montmorillonite to obtain a first mixed material;
(2) Preheating the waste asphalt mixture and the new asphalt, adding the waste asphalt mixture and the regenerant, the styrene thermoplastic elastomer and the stabilizer into the first mixture, heating and stirring for 30-40min, and finally adding carbon black and stirring for 10-15min.
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