CN115058258A - Method for rapidly recovering asphalt from waste asphalt mixture in high fidelity - Google Patents
Method for rapidly recovering asphalt from waste asphalt mixture in high fidelity Download PDFInfo
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- CN115058258A CN115058258A CN202210624622.6A CN202210624622A CN115058258A CN 115058258 A CN115058258 A CN 115058258A CN 202210624622 A CN202210624622 A CN 202210624622A CN 115058258 A CN115058258 A CN 115058258A
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- asphalt
- asphalt mixture
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- waste asphalt
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- 239000010426 asphalt Substances 0.000 title claims abstract description 136
- 239000000203 mixture Substances 0.000 title claims abstract description 61
- 239000002699 waste material Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000011084 recovery Methods 0.000 claims abstract description 12
- 238000002791 soaking Methods 0.000 claims abstract description 9
- 238000001291 vacuum drying Methods 0.000 claims abstract description 8
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000005119 centrifugation Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 239000006228 supernatant Substances 0.000 claims abstract description 5
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000005303 weighing Methods 0.000 claims abstract description 3
- 238000001035 drying Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 230000032683 aging Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 238000007873 sieving Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 22
- 229910052742 iron Inorganic materials 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000703 high-speed centrifugation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000002390 rotary evaporation Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Working-Up Tar And Pitch (AREA)
Abstract
The invention discloses a method for quickly recovering asphalt from waste asphalt mixture in high fidelity, which comprises the following steps: selecting a waste asphalt mixture, and sieving the waste asphalt mixture by a 4.75mm sieve to obtain a coarse-fine waste asphalt mixture; respectively placing in trichloroethylene, stirring, sealing, and soaking for 45-60 min; then centrifugating for 10-15 minutes at 8000-; and respectively pouring supernatant liquor which is obtained after centrifugation and accounts for 30-50% of the capacity of the centrifugal tube into a tray, performing vacuum drying at 40-70 ℃ for more than 4 hours to obtain two parts of recovered asphalt, weighing the recovered asphalt according to the asphalt content proportion in the coarse and fine waste asphalt mixture before recovery, and then uniformly mixing. The method has the advantages of short asphalt dissolving time, more sufficient asphalt dissolving, effective prevention of aging of the recovered asphalt, high fidelity of the obtained asphalt, short time of the whole recovery process, low temperature, high recovery efficiency, energy conservation, environmental protection, low cost and wide application value.
Description
Technical Field
The invention belongs to the technical field of asphalt, and particularly relates to a method for quickly recovering asphalt from waste asphalt mixture in a high fidelity manner.
Background
According to statistics, the quantity of waste asphalt mixture generated in China every year will exceed 1 hundred million tons. The huge amount of waste asphalt mixture not only occupies a large amount of land, but also pollutes the environment. On the other hand, the gap of maintenance cost of the asphalt pavement is large, and the shortage of high-quality aggregates also seriously restricts the road engineering construction, so that the resource and environmental problems in the current road construction are more severe. Therefore, the waste asphalt mixture is efficiently utilized, and the method has important significance for promoting the low-carbon development of road engineering.
In order to fully utilize aged asphalt and aggregate in waste asphalt mixture (RAP), the thermal regeneration technology is the most widely used regeneration technology at present. The thermal regeneration technology adds the original waste asphalt mixture according to a certain proportion, and simultaneously adds new aggregate and new asphalt to prepare the regenerated asphalt mixture reaching the performance level of the new asphalt mixture. The method comprises the steps of firstly, collecting aged asphalt in a waste asphalt mixture, then, obtaining the property of the collected asphalt, evaluating whether the waste asphalt mixture can be used for thermal regeneration, and then, selecting appropriate newly-added asphalt according to the property of the waste asphalt to carry out mix proportion design. Therefore, the method has important engineering value for quickly recycling the waste asphalt with high fidelity.
At the present stage, the national specification (JTG E20-2011) recommends that methods for recovering asphalt mainly comprise an Abson method and a rotary evaporation method, and the two methods both need to adopt special centrifugal equipment to dissolve waste asphalt, on one hand, the centrifugal revolution is not high enough (3000 r/min), so that a large amount of powder is easily left in an asphalt solution, and the performance of the asphalt is distorted; on the other hand, the prior method evaporates the asphalt solution under the heating condition (155-165 ℃), which is easy to cause the aging of the waste asphalt and influence the recognition of the properties of the recycled asphalt. In addition, the two methods recommended by the specification require complex chemical equipment, have high requirements on operators and easily cause great discreteness of the recycled asphalt. Therefore, it is of great value to develop a process which can be easily operated and which can recover the properties of asphalt with high fidelity.
Disclosure of Invention
The invention provides a method for quickly recovering asphalt from waste asphalt mixture with high fidelity, which has the advantages of short asphalt dissolving time, more sufficient dissolution, effective prevention of aging of the recovered asphalt, high fidelity of the obtained asphalt, short time of the whole recovery process, low temperature, high recovery efficiency, energy conservation, environmental protection, low cost and wide application value.
In order to solve the technical problems, the invention adopts the following technical scheme:
the method for rapidly recovering the asphalt from the waste asphalt mixture with high fidelity comprises the following steps:
1) selecting waste asphalt mixtures, screening by adopting a 4.75mm sieve, and dividing into second-grade waste asphalt mixtures with different thicknesses;
2) respectively placing the two grades of asphalt mixtures with different thicknesses obtained in the step 1) into trichloroethylene at room temperature, stirring, and hermetically soaking for 45-60 min;
3) centrifuging the thick and thin asphalt mixture soaked in the step 2) respectively for 10-15 minutes at 8000-;
4) pouring the supernatant liquor which is obtained after centrifugation in the step 3) and accounts for 30-50% of the capacity of the centrifuge tube into a tray, performing vacuum drying at 40-70 ℃ for more than 4 hours, respectively recovering to obtain the asphalt in the coarse waste asphalt mixture and the fine waste asphalt mixture, weighing the recovered asphalt according to the asphalt content proportion in the coarse waste asphalt mixture and the fine waste asphalt mixture before recovery, and then uniformly mixing.
According to the scheme, in the step 1), sampling is carried out on the asphalt mixture by adopting a quartering method, and then screening is carried out.
According to the scheme, in the step 4), the depth of the disc is more than 1 cm; preferably 1-3 cm.
According to the scheme, in the step 4), the vacuum degree is selected to be between-0.05 and-0.08 MPa during vacuum drying.
According to the scheme, in the step 4), the drying is carried out in vacuum until the variation amplitude of the mass of the disc is less than 0.1%.
The invention has the following beneficial effects:
the invention provides a method for quickly recovering asphalt from waste asphalt mixture in high fidelity, which comprises the steps of firstly, separately soaking coarse and fine waste asphalt, shortening the soaking time, improving the soaking effect, efficiently soaking at room temperature, and solving the problem of insufficient dissolution of coarse and fine aggregate accumulated asphalt; then, adopting 8000-one 12000 r/min high speed centrifugation mode to reduce the powder residue and reduce the influence on the asphalt recovery performance; finally, the drying temperature is reduced through vacuum drying, and the aging of the recycled asphalt is further reduced; the method has the advantages of high recovery efficiency, low recovery temperature, no need of complex equipment, simple operation, rapid and high-fidelity recovery of the waste asphalt, and wide industrial application value.
Drawings
FIG. 1 is a comparison of the complex modulus of the waste asphalt extracted and recovered in example 1 and the non-extracted waste asphalt in comparative example 1.
FIG. 2 is a comparison of the composite modulus of the waste asphalt obtained by extraction and recovery in example 2 and the unextracted waste asphalt in comparative example 2.
The specific implementation mode is as follows:
the technical solution of the present invention is further explained by the following specific examples.
Example 1:
selecting an unaged matrix asphalt, designing an asphalt mixture according to the gradation of an AC-13 asphalt mixture, mixing the asphalt mixture with basalt aggregates at 140 ℃, then manually loosening and cooling the heat-dissipating asphalt mixture, simulating to form a waste asphalt mixture, and recycling asphalt, and specifically comprising the following steps:
1) sampling the waste asphalt mixture by adopting a quartering method, then screening by adopting a 4.75mm sieve, and dividing into second-grade waste asphalt mixtures with different thicknesses, wherein the mass ratio of the waste asphalt in the thick and thin waste asphalt mixtures is 1: 1;
2) respectively placing the two grades of asphalt mixtures with different thicknesses obtained in the step 1) into glass bottles filled with trichloroethylene at room temperature, manually stirring, and then sealing and soaking for 60 min;
3) centrifuging the thick and thin asphalt mixture soaked in the step 2) respectively for 12 minutes at 8000 revolutions per minute;
4) pouring the supernatant liquor which is obtained after the centrifugation in the step 3) and accounts for 30% of the capacity of the centrifuge tube into a circular iron disc, wherein the depth of the iron disc is 2cm, placing the iron disc in a vacuum drying oven in a fume hood, the vacuum degree is-0.07 MPa, drying for 6 hours at the temperature of 60 ℃, the variation range of the mass of the iron disc is less than 0.1%, and respectively recovering to obtain waste asphalt in a proportion of 1:1 to obtain the recycled asphalt.
Comparative example 1:
the non-aged base asphalt of example 1 was selected, heated to 140 ℃, placed in an iron pan, and then naturally cooled to serve as a comparative example for the recovered asphalt.
The rheological tests of the recycled asphalt of example 1 and the comparative asphalt of comparative example 1 were carried out at temperatures chosen between 30 ℃ and 80 ℃ and the complex modulus was measured. The results are shown in FIG. 1 below. The rheological properties of the asphalt have high conformity, which indicates that the extraction has little influence on the asphalt properties.
Example 2
Selecting a matrix asphalt, heating to 140 ℃ in an oven, and keeping for 24 hours to prepare the aged asphalt. Then designing an asphalt mixture according to the gradation of the AC-13 asphalt mixture, mixing the asphalt mixture with the basalt aggregate at 150 ℃, then manually loosening the heat-dissipating asphalt mixture, cooling, simulating to form a waste asphalt mixture, and recycling asphalt, wherein the method specifically comprises the following steps:
1) sampling the waste asphalt mixture by adopting a quartering method, then screening by adopting a 4.75mm sieve, and dividing into second-grade waste asphalt mixtures with different thicknesses, wherein the mass ratio of the waste asphalt in the thick and thin waste asphalt mixtures is 1: 1;
2) respectively placing the two grades of asphalt mixtures with different thicknesses obtained in the step 1) into glass bottles filled with trichloroethylene at room temperature, manually stirring, and then sealing and soaking for 45 min;
3) centrifuging the thick and thin asphalt mixtures soaked in the step 2) respectively for 10 minutes at 9000 revolutions per minute;
4) pouring supernatant liquor which accounts for 30% of the capacity of the centrifugal tube and is obtained after centrifugation in the step 3) into a circular iron disc, wherein the depth of the iron disc is 2cm, placing the iron disc into a vacuum drying oven in a fume hood, the vacuum degree is-0.05 MPa, drying the iron disc for 6 hours at the temperature of 60 ℃, the variation range of the mass of the iron disc is less than 0.1%, and respectively recovering to obtain coarse waste asphalt and fine waste asphalt, wherein the ratio of the coarse waste asphalt to the fine waste asphalt is 1:1 to obtain the recycled asphalt.
Comparative example 2:
the aged asphalt prepared in example 2 was selected. After heating to 150 ℃, the mixture was placed in an iron pan and naturally cooled to obtain a comparative example of the recovered asphalt.
The rheological tests of the recycled asphalt of example 2 and the comparative asphalt of comparative example 2 were carried out at temperatures selected between 30 ℃ and 80 ℃ to test the composite modulus. The results are shown in FIG. 2. The rheological properties of the asphalt have high conformity, which indicates that the extraction has little influence on the asphalt properties.
Claims (6)
1. A method for rapidly recovering asphalt from waste asphalt mixture with high fidelity is characterized by comprising the following steps:
1) selecting waste asphalt mixtures, screening by adopting a 4.75mm sieve, and dividing into second-grade waste asphalt mixtures with different thicknesses;
2) respectively placing the two grades of asphalt mixtures with different thicknesses obtained in the step 1) into trichloroethylene at room temperature, stirring, and hermetically soaking for 45-60 min;
3) centrifuging the thick and thin asphalt mixture soaked in the step 2) respectively for 10-15 minutes at 8000-;
4) pouring the supernatant liquor which is obtained after centrifugation in the step 3) and accounts for 30-50% of the capacity of the centrifuge tube into a tray, performing vacuum drying at 40-70 ℃ for more than 4 hours, respectively recovering to obtain the asphalt in the coarse waste asphalt mixture and the fine waste asphalt mixture, weighing the recovered asphalt according to the asphalt content proportion in the coarse waste asphalt mixture and the fine waste asphalt mixture before recovery, and then uniformly mixing.
2. The method as claimed in claim 1, wherein in the step 1), the asphalt mixture is sampled by a quartering method and then sieved.
3. The method according to claim 1, wherein in the step 4), the depth of the disc is 1cm or more.
4. A method according to claim 3, wherein the depth of the disc is 1-3 cm.
5. The method as claimed in claim 1, wherein in the step 4), the vacuum degree during vacuum drying is selected to be between-0.05 and-0.08 MPa.
6. The method of claim 1, wherein in step 4), the drying is performed under vacuum until the mass of the disc changes by less than 0.1%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210624622.6A CN115058258A (en) | 2022-06-02 | 2022-06-02 | Method for rapidly recovering asphalt from waste asphalt mixture in high fidelity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210624622.6A CN115058258A (en) | 2022-06-02 | 2022-06-02 | Method for rapidly recovering asphalt from waste asphalt mixture in high fidelity |
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| CN115058258A true CN115058258A (en) | 2022-09-16 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103711058A (en) * | 2013-12-10 | 2014-04-09 | 柳州博泽科技有限公司 | Process for recycling asphalt from asphalt mixture |
| CN206725321U (en) * | 2017-05-18 | 2017-12-08 | 吉林省嘉鹏集团有限公司 | Aged asphalt extraction equipment in waste asphalt mixture |
| CN107711484A (en) * | 2017-11-20 | 2018-02-23 | 黄林海 | A kind of wheat-soaking device with classification |
| CN111122725A (en) * | 2019-12-19 | 2020-05-08 | 扬州大学 | Ageing asphalt performance recovery evaluation method |
| CN111220499A (en) * | 2020-04-13 | 2020-06-02 | 佛山市交通科技有限公司 | Method for measuring agglomeration rate of waste asphalt mixture and application |
-
2022
- 2022-06-02 CN CN202210624622.6A patent/CN115058258A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103711058A (en) * | 2013-12-10 | 2014-04-09 | 柳州博泽科技有限公司 | Process for recycling asphalt from asphalt mixture |
| CN206725321U (en) * | 2017-05-18 | 2017-12-08 | 吉林省嘉鹏集团有限公司 | Aged asphalt extraction equipment in waste asphalt mixture |
| CN107711484A (en) * | 2017-11-20 | 2018-02-23 | 黄林海 | A kind of wheat-soaking device with classification |
| CN111122725A (en) * | 2019-12-19 | 2020-05-08 | 扬州大学 | Ageing asphalt performance recovery evaluation method |
| CN111220499A (en) * | 2020-04-13 | 2020-06-02 | 佛山市交通科技有限公司 | Method for measuring agglomeration rate of waste asphalt mixture and application |
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| CB03 | Change of inventor or designer information |
Inventor after: Lin Juntao Inventor after: Li Yaode Inventor after: Lan Yu Inventor after: Li Wei Inventor after: Xu Fang Inventor after: Xie Chuankai Inventor after: Xia Yu Inventor after: Yao Lin Inventor after: Wang Kun Inventor after: Chen Zhuang Inventor after: Zhao Zhicheng Inventor before: Li Wei Inventor before: Li Yaode Inventor before: Lan Yu Inventor before: Lin Juntao Inventor before: Xie Chuankai Inventor before: Xia Yu Inventor before: Yao Lin Inventor before: Xu Fang Inventor before: Wang Kun Inventor before: Chen Zhuang Inventor before: Zhao Zhicheng |
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Application publication date: 20220916 |
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