CN113943490B - Asphalt warm-mixing regenerant, warm-mixing regenerated asphalt and preparation method thereof - Google Patents
Asphalt warm-mixing regenerant, warm-mixing regenerated asphalt and preparation method thereof Download PDFInfo
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- CN113943490B CN113943490B CN202111024295.2A CN202111024295A CN113943490B CN 113943490 B CN113943490 B CN 113943490B CN 202111024295 A CN202111024295 A CN 202111024295A CN 113943490 B CN113943490 B CN 113943490B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/01—Hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
- C08K5/19—Quaternary ammonium compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention belongs to the technical field of road materials, and particularly discloses an asphalt warm-mixing regenerant, warm-mixing regenerated asphalt based on the asphalt warm-mixing regenerant and a preparation method of the warm-mixing regenerated asphalt. The asphalt warm-mixing regenerant provided by the invention takes the amine surfactant, the asphalt regeneration component and the toughening component as effective components, and can effectively improve three indexes of penetration, extensibility and softening point of asphalt through reasonable blending of the amine surfactant, the asphalt regeneration component and the toughening component. When the warm-mix recycled asphalt based on the asphalt warm-mix recycling agent is applied to milling materials, the viscosity of asphalt in an application system can be reduced, and the wetting of recycled asphalt components and new asphalt on old asphalt can be promoted; the saturated hydrocarbon content of the aged asphalt is supplemented by combining the use of asphalt regeneration components, so that the old asphalt can exert the original cementing performance, and finally, the warm-mixing regeneration of the asphalt warm-mixing regenerant on the aged asphalt in the milling material is realized, and then the asphalt warm-mixing regenerant is recycled, so that the road maintenance cost is reduced, and the resource waste is reduced.
Description
Technical Field
The invention belongs to the technical field of road materials, and particularly relates to an asphalt warm-mixing regenerant, warm-mixing regenerated asphalt based on the asphalt warm-mixing regenerant and a preparation method of the warm-mixing regenerated asphalt.
Background
The high-grade highway in China is mainly made of asphalt pavement, most of the asphalt pavement in China enters the peak period of maintenance and maintenance according to the design service life of 15 years or 20 years, and the medium maintenance and the overhaul maintenance are frequent. At present, the overhaul of the asphalt pavement is basically to mill the original pavement and then pave a new asphalt pavement, so a considerable amount of recycled asphalt pavement materials are generated, the milled materials generated by each year of overhaul exceed tens of thousands of tons and are in a trend of rising year by year, land resources are occupied, environmental pollution is caused, and huge waste of resources is caused.
The warm-mixed recycled asphalt can give consideration to warm mixing and recycling effects, can effectively improve three major indexes of milling materials, and effectively reduce the viscosity of the asphalt; the mixing temperature is reduced by adopting a warm mixing mode, so that the energy consumption problem caused by high-temperature mixing and the release of irritant gas in the mixing process are solved, the effects of energy conservation and emission reduction are achieved, and the working environment quality of workers is improved.
For example, chinese patent document CN 108587204 discloses a warm-mix recycling agent for asphalt mixture and a preparation and use method thereof, wherein the raw materials of the warm-mix recycling agent are used oil, graphene, light oil, fiber, desulfurized rubber powder, polyolefin material and glyceride material; however, in the scheme, when the warm-mixed recycled asphalt is prepared, the warm-mixed agent is required to be prepared into capsules, and the tough agent is prepared after encapsulation, so that the warm-mixed recycled asphalt capsule is required to be prefabricated in advance when the warm-mixed recycled asphalt is actually used, and therefore, the method has no general applicability in engineering and has certain limitation. For another example, chinese patent document CN 112062495a discloses a warm-mix regenerant and a method for producing warm-mix recycled asphalt, wherein the raw materials of the warm-mix regenerant are polysorbate, oxidized polyethylene wax, rubber oil and sodium dodecyl benzene sulfonate; however, the scheme still needs to be completed at a higher temperature in the production blending process, so that the secondary aging of the asphalt occurs in the regeneration process, and the durability of the asphalt pavement is not facilitated.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an asphalt warm-mixing regenerant, warm-mixing regenerated asphalt based on the asphalt warm-mixing regenerant and a preparation method of the warm-mixing regenerated asphalt.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the asphalt warm-mixing regenerant comprises the following components which are uniformly mixed according to the mass parts:
1-5 parts of amine surfactant;
10-15 parts of asphalt regeneration component;
and the toughening component is 5-10.
Further, the amine surfactant is a long-chain amine salt type cationic surfactant; wherein the carbon number of the hydrophobic group is 12-18, and the hydrophilic group is polyethylene polyamine, preferably triethylene tetramine or tetraethylene pentamine.
Further, the bitumen cutback component is a cycloalkane, preferably having a kinematic viscosity at 100 ℃ of 8mm 2 /s～12mm 2 Naphthenic oil per second.
Still further, the toughening component is an ethylene vinyl acetate copolymer; wherein the mass content of the vinyl acetate is 20-40%.
The invention also aims to provide warm-mix recycled asphalt based on the asphalt warm-mix recycling agent, which comprises the asphalt warm-mix recycling agent and petroleum asphalt which is uniformly mixed with the asphalt warm-mix recycling agent and subjected to warm-mix recycling.
Specifically, in the warm-mix reclaimed asphalt, the asphalt warm-mix regenerant accounts for 20-30 parts by mass and the petroleum asphalt accounts for 70-80 parts by mass based on 100 parts by mass of the warm-mix reclaimed asphalt.
The preparation of the warm-mix reclaimed asphalt adopts the following method.
The method specifically comprises the following steps:
s1, mixing and dissolving petroleum asphalt and a toughening component at 140-160 ℃ for 30-45 min, shearing for 40-60 min, and after shearing is finished, developing at 140-160 ℃ for 30-120 min to obtain toughened asphalt;
s2, fully mixing the amine surfactant and the asphalt regeneration component for 90-180S at 40-60 ℃ to obtain a warm-mixed regeneration intermediate;
and S3, adding the warm-mixed recycled intermediate obtained in the step S2 into the toughened asphalt obtained in the step S1, and fully mixing for 15-20 min to obtain the warm-mixed recycled asphalt.
Preferably, in the step S2, the amine surfactant and the asphalt regeneration component are mixed in a mixing device, and the mixing rate is 20r/min to 40r/min.
The invention adopts the amine surfactant as the warm-mix component of the asphalt, when the amine surfactant exists in the form of warm-mix recycled asphalt and is further applied to milling materials, the viscosity of the asphalt can be reduced when the asphalt in an application system is subjected to warm-mix regeneration, and the surface tension effect of the surfactant can be utilized to promote the wetting of the asphalt recycled component and new asphalt (namely petroleum asphalt in the warm-mix recycled asphalt) on old asphalt (namely asphalt in the milling materials) and further reduce and regenerate the old asphalt and aged asphalt, so that the old asphalt and the aged asphalt can be fully dissolved and dissipated; in combination with the use of bitumen rejuvenating components (e.g. naphthenes), the saturated hydrocarbon content of the aged bitumen is supplemented. The two components act together to supplement complete asphalt components, so that the old asphalt can exert the original cementing performance. Meanwhile, the toughening component is matched, so that the ductility of the asphalt is enhanced, and the low-temperature deformation performance of the asphalt is improved. Finally, the warm-mixing regeneration of the aged asphalt in the milling material by the asphalt warm-mixing regenerant is realized, and then the aged asphalt is recycled, so that the road maintenance cost is reduced, and the resource waste is reduced.
The asphalt warm-mixing regenerant is applied to the regeneration process of milling materials or aged asphalt, and the key point is how to improve the viscosity of the asphalt and the flexibility of the asphalt; therefore, the warm-mixing regeneration effective component which is matched with the amine surfactant and the asphalt regeneration component is adopted, and components such as petroleum resin, wax and the like are avoided, so that the two substances are prevented from reducing the low-temperature crack resistance of the asphalt and being incapable of regenerating the aged asphalt.
In addition, the adoption of the warm mixing process is beneficial to reducing the energy consumption and the discharge of pungent odor caused by high-temperature mixing, and also plays a role in energy conservation and emission reduction.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail. This invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided to explain the principles of the invention and its practical application to thereby enable others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated.
Table 1 below shows warm-mix asphalt recycling agents having various compositions provided in examples 1 to 3.
Table 1 composition of warm-mix asphalt recycling agent in examples 1 to 3
Meanwhile, a warm mix asphalt additive of a prior art product having the following composition was used as a comparative example for comparison with each of the above-described examples of the present invention.
Comparative example
The comparative example provides an existing warm mix asphalt additive product comprising the following mass components:
in order to show the good warm-mixing effect of the warm-mix asphalt recycling agent provided by the invention on asphalt, the warm-mix asphalt recycling agents obtained in the above examples 1 to 3 and the warm-mix asphalt additive provided in the comparative example were mixed with petroleum asphalt according to the mass ratio of 1:4 (namely, according to the compounding composition of "20% of warm-mix asphalt recycling agent/warm-mix asphalt additive +80% of petroleum asphalt") and the performances thereof were tested.
The results of the warm-mix asphalt performance test of the warm-mix asphalt recycling agents of examples 1 to 3 and the warm-mix asphalt additive of the comparative example are shown in table 2.
TABLE 2 Warm-mix asphalt Performance of the warm-mix asphalt recycling agent of examples 1 to 3 and the warm-mix asphalt additive of comparative example
As can be seen from the performance test data in table 2, compared with the warm-mix asphalt additive in the prior art, the warm-mix asphalt recycling agents provided in the above examples 1 to 3 of the present invention effectively improve the penetration and softening point of asphalt on the basis of the substantially flat ductility, and exhibit more excellent viscosity and plasticity than the warm-mix asphalt additive in the prior art.
Based on the asphalt warm-mix regenerants provided by the embodiments 1 to 3, the invention also provides three warm-mix regenerated asphalts correspondingly. The following table 3 shows the compounding compositions of the warm-mix reclaimed asphalt provided in examples 4 to 6.
Table 3 composition of the warm mix reclaimed asphalt in examples 4 to 6
The warm-mix recycled asphalt in each of examples 4 to 6 was prepared by the following method.
Example 4:
firstly, mixing and dissolving No. 70 petroleum asphalt and ethylene vinyl acetate copolymer (with the VA content of 20%) at 160 ℃ for 30min according to the using amount in the tables 1 and 2, shearing the mixture for 1h by using a high-speed shearing machine, and placing the sheared modified asphalt at 160 ℃ for 2h to obtain toughened asphalt.
Secondly, weighing KN4010 type naphthenic oil and laurylamine according to the dosage in the table 1, keeping the temperature at 40-60 ℃, putting the weighed materials into a stirrer, and stirring for 120s, wherein in order to ensure that the two materials are fully stirred and uniformly fused, the optimal rotating speed is kept at 30r/min, and the warm-mixed regeneration intermediate is obtained.
And finally, adding the prepared warm-mix recycled intermediate into the toughened asphalt heated to the mixing temperature, and mixing for 15-20 min to obtain the warm-mix recycled asphalt.
Example 5:
firstly, mixing No. 10 petroleum asphalt and ethylene-vinyl acetate copolymer (with the VA content of 30%) at the temperature of 160 ℃ for 30min according to the dosage in the tables 1 and 2, shearing for 1h by using a high-speed shearing machine, and placing the sheared modified asphalt at the temperature of 160 ℃ for 2h to obtain the toughened asphalt.
Secondly, weighing KN4006 type naphthenic oil and dodecyl tertiary ammonium salt according to the dosage in the table 1, keeping the temperature at 40-60 ℃, putting into a stirrer, and stirring for 120s, and keeping the optimal rotating speed at 30r/min to ensure that the two substances are fully stirred and uniformly fused to obtain a warm-mixed regeneration intermediate.
And finally, adding the prepared warm-mix recycled intermediate into the toughened asphalt heated to the mixing temperature, and mixing for 15-20 min to obtain the warm-mix recycled asphalt.
Example 6:
firstly, mixing No. 50 asphalt with ethylene-vinyl acetate copolymer (the VA content is 40%) according to the dosage in the above tables 1 and 2 at 160 ℃ for 30min, shearing for 1h by using a high-speed shearing machine, and placing the sheared modified asphalt at 160 ℃ for 2h to obtain toughened asphalt.
Then, according to the dosage in the table 1, the No. 500 naphthenic oil and tetrabutylammonium bromide are weighed, the mixture is put into a stirrer to be stirred for 120s under the temperature of 40-60 ℃, and in order to ensure that the two substances are fully stirred and uniformly fused, the optimal rotating speed is kept at 30r/min, and the warm-mixed regeneration intermediate is obtained.
And finally, adding the prepared warm-mixing regeneration intermediate into the toughened asphalt heated to the mixing temperature for stirring, wherein the mixing time is controlled to be 15-20 min.
In order to show the good warm-mix recycling effect of the warm-mix recycled asphalt provided by the present invention on the aged asphalt, the warm-mix recycled asphalt obtained in each of examples 4 to 6 was mixed with the aged asphalt in a mass ratio of 1:1 (i.e., a composition of "50% warm-mix recycled asphalt +50% aged asphalt"), and the performance of the mixture was compared with the aged asphalt. The results of the performance test of each of the warm-mixed reclaimed asphalt and the aged asphalt in examples 4 to 6 are shown in Table 4.
Table 4 warm-mix recycling performance of warm-mix recycled asphalt versus aged asphalt in examples 4 to 6
As can be seen from the performance test data in table 4, when the asphalt warm-mix recycling agent provided in the above examples 1 to 3 of the present invention is first prepared into warm-mix recycled asphalt and then applied to aged asphalt, the three major indexes of penetration (viscosity), ductility (plasticity) and softening point (temperature stability) of the aged asphalt are effectively improved. The extension performance of the aged asphalt is obviously increased (120-250 percent), and the low-temperature performance of the asphalt is embodied; the lower softening point of the aged asphalt also reflects better high-temperature performance; therefore, the warm-mixed regenerated asphalt has excellent high-temperature anti-rutting performance and low-temperature anti-cracking performance.
While the invention has been shown and described with reference to certain embodiments, those skilled in the art will understand that: various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (4)
1. The asphalt warm-mixing regenerant is characterized by comprising the following components which are uniformly mixed according to the mass parts:
1-5 parts of amine surfactant;
10-15 parts of asphalt regeneration component;
5-10 parts of toughening component;
wherein the amine surfactant is a long-chain amine salt type cationic surfactant; wherein the carbon number of the hydrophobic group is 12-18, and the hydrophilic group is triethylene tetramine or tetraethylene pentamine;
the asphalt recycling component has the kinematic viscosity of 8mm at 100 DEG C 2 /s～12mm 2 Naphthenic oil/s;
the toughening component is an ethylene vinyl acetate copolymer; wherein the mass content of the vinyl acetate is 20-40%.
2. A warm-mix reclaimed asphalt, which is characterized by comprising 20 to 30 parts by mass of the asphalt warm-mix regenerant as defined in claim 1 and 70 to 80 parts by mass of petroleum asphalt which is mixed with the asphalt warm-mix regenerant uniformly and subjected to warm-mix regeneration; the mass of the warm-mixed recycled asphalt is 100 parts.
3. The method for preparing warm-mixed reclaimed asphalt according to claim 2, comprising the steps of:
s1, mixing and dissolving petroleum asphalt and a toughening component at 140-160 ℃ for 30-45 min, shearing for 40-60 min, and after shearing is finished, developing at 140-160 ℃ for 30-120 min to obtain toughened asphalt;
s2, fully mixing the amine surfactant and the asphalt regeneration component at 40-60 ℃ for 90-180S to obtain a warm-mixed regeneration intermediate;
and S3, adding the warm-mixed regenerated intermediate obtained in the step S2 into the toughened asphalt obtained in the step S1, and fully stirring for 15-20 min to obtain the warm-mixed regenerated asphalt.
4. The preparation method according to claim 3, wherein in the step S2, the amine surfactant and the asphalt recycling component are mixed in a mixing device at a mixing speed of 20r/min to 40r/min.
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| CN102050599A (en) * | 2010-11-16 | 2011-05-11 | 广东工业大学 | Method for preparing plastic warm-stirred modified asphalt mixture |
| CN106012746A (en) * | 2016-07-08 | 2016-10-12 | 山东大山路桥工程有限公司 | Surface treatment method for achieving low noise and skid resistance of road |
| CN107629472A (en) * | 2017-10-10 | 2018-01-26 | 周荣 | A kind of osmosis type bitumen regenerant and preparation method thereof |
| CN109535751A (en) * | 2018-12-27 | 2019-03-29 | 山东高速建设材料有限公司 | Stress absorbing layer high solids content emulsified asphalt and its preparation and construction method |
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| CN112062495A (en) * | 2020-09-17 | 2020-12-11 | 西南交通大学 | Warm-mix regenerant and preparation method of warm-mix regenerated asphalt |
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