CN118084398A - Regenerated oil-rich mortar based on refined separation technology and preparation method thereof - Google Patents
Regenerated oil-rich mortar based on refined separation technology and preparation method thereof Download PDFInfo
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- CN118084398A CN118084398A CN202410122406.0A CN202410122406A CN118084398A CN 118084398 A CN118084398 A CN 118084398A CN 202410122406 A CN202410122406 A CN 202410122406A CN 118084398 A CN118084398 A CN 118084398A
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- asphalt
- oil
- rich
- regenerated
- rap
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 36
- 238000000926 separation method Methods 0.000 title claims abstract description 26
- 238000005516 engineering process Methods 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000010426 asphalt Substances 0.000 claims abstract description 101
- 239000000463 material Substances 0.000 claims abstract description 34
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 239000012492 regenerant Substances 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 239000002699 waste material Substances 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 3
- 239000011259 mixed solution Substances 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000003921 oil Substances 0.000 claims description 37
- 235000019198 oils Nutrition 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 9
- 239000002904 solvent Substances 0.000 claims description 7
- 238000007670 refining Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- CYEJMVLDXAUOPN-UHFFFAOYSA-N 2-dodecylphenol Chemical compound CCCCCCCCCCCCC1=CC=CC=C1O CYEJMVLDXAUOPN-UHFFFAOYSA-N 0.000 claims description 2
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 2
- 239000008158 vegetable oil Substances 0.000 claims description 2
- 230000004927 fusion Effects 0.000 abstract description 15
- 230000008929 regeneration Effects 0.000 abstract description 7
- 238000011069 regeneration method Methods 0.000 abstract description 7
- 239000006184 cosolvent Substances 0.000 abstract description 6
- 230000001737 promoting effect Effects 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000005054 agglomeration Methods 0.000 description 6
- 230000002776 aggregation Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- 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
- Working-Up Tar And Pitch (AREA)
- Road Paving Structures (AREA)
Abstract
A regenerated oil-rich mortar based on a refined separation technology and a preparation method thereof comprise the following steps: heating the RAP fine material in an oven at 130-140 ℃ for 2-4 hours, and drying the water; heating the modified asphalt to a flowing state at 160-180 ℃ and uniformly mixing to obtain asphalt mixed solution; and adding the treated RAP fine material into the asphalt mixture, maintaining the temperature of the whole system at 160-180 ℃, and stirring at 200-800 RPM for 15-40 min to obtain the regenerated oil-rich mortar. The regenerated oil-rich mortar comprises the following raw materials in parts by mass: 39.9 to 79.3 parts of refined and separated RAP fine materials, 19.8 to 59.9 parts of modified asphalt, 0.1 to 0.6 part of regenerant and 0.1 to 0.3 part of cosolvent. The invention provides regenerated oil-rich mortar based on a refined separation technology and a preparation method thereof, wherein the regenerated oil-rich mortar can realize full fusion of new asphalt and old asphalt, and the old asphalt can be deeply regenerated and recovered. The invention has remarkable significance for improving the road performance of the regenerated asphalt mixture and further promoting the high-quality regeneration and utilization of waste resources.
Description
Technical Field
The invention relates to the technical field of highway engineering asphalt pavement maintenance materials, in particular to regenerated oil-rich mortar based on a refined separation technology and a preparation method thereof.
Background
Because of major and middle maintenance engineering of asphalt pavement every year, a large amount of waste asphalt pavement materials (RAP) are generated, and how to efficiently treat the waste becomes a huge problem.
RAP is an irregularly shaped multiphase mixture formed from old asphalt binding a plurality of aggregate particles. Therefore, agglomeration is one of the most remarkable characteristics of the RAP material, and the key problems of insufficient fusion of the new asphalt and the old asphalt and poor regeneration effect of the old asphalt are extremely easy to cause in the process of adding the new asphalt and the new aggregate for regenerating the new asphalt and the new aggregate. The refining separation technology is an emerging RAP pretreatment technology, and the old asphalt mortar bonded on the RAP coarse material is stripped through the shearing and grinding actions generated by a high-speed centrifuge, so that the purposes of separating the old asphalt from the old aggregate and eliminating agglomeration are achieved. After the RAP is refined and separated, the coarse asphalt content is low, and the agglomeration is basically eliminated. RAP fines account for a relatively large amount, and asphalt content is relatively large, but agglomeration still exists, so that the problems of fusion and deep regeneration of old asphalt cannot be solved.
Disclosure of Invention
The technical problems to be solved are as follows: aiming at the problems in the prior art, the invention provides regenerated oil-rich mortar based on a refined separation technology and a preparation method thereof, and the regenerated oil-rich mortar is prepared by refining and separating RAP fines and new asphalt, so that the full fusion of the new asphalt and the old asphalt can be realized, and the performance of the aged asphalt can be deeply regenerated and recovered.
The technical scheme is as follows: a preparation method of regenerated oil-rich mortar based on a refined separation technology comprises the following steps:
Step A, heating RAP fine materials in an oven at 130-140 ℃ for 2-4 hours, and drying water;
step B, heating the modified asphalt to a flowing state at 160-180 ℃ and uniformly mixing to obtain asphalt mixed solution;
and C, adding the RAP fine material treated in the step A into the asphalt mixture in the step B, maintaining the temperature of the whole system at 160-180 ℃, and stirring at 200-800 RPM (revolutions per minute) for 15-40 min to obtain the regenerated oil-rich mortar.
Preferably, the mass ratio of the RAP fine materials to the modified asphalt is (39.9-79.3): (19.8-59.9).
Preferably, in the step B, after the modified asphalt is heated to a flowing state at 160-180 ℃, a regenerant and a solvent promoter are added and stirred for 5-10 min, so that the components are uniformly mixed to obtain an asphalt mixture.
Preferably, the mass ratio of the RAP fine materials to the modified asphalt to the regenerant to the cosolvent is (39.9-79.3): (19.8-59.9): (0.1-0.6): (0.1-0.3).
Preferably, the RAP fine material is RAP material with the grain diameter smaller than 3mm and the asphalt content range of 6-12 wt% after separation by a refining separation technology.
Preferably, the modified asphalt is SBS modified asphalt.
Preferably, the regenerant is at least one of vegetable oil-based, wire-reduced oil-based, waste organic oil-based and rubber oil-based regenerants.
Preferably, the cosolvent is at least one of cocoamide diethanol, dodecylphenol and polyethylene glycol.
The regenerated oil-rich mortar based on the refined separation technology is prepared based on the method.
The beneficial effects are that: compared with the problem of insufficient regeneration of old asphalt caused by incomplete fusion of new asphalt and old asphalt in the conventional regeneration technology, the method provided by the invention is used in a mode of preparing regenerated rich mortar by using the new asphalt and the RAP fine material obtained based on the fine separation technology, so that the aged asphalt can be dissolved and fully fused with the new asphalt, and the old asphalt can be deeply regenerated.
Drawings
FIG. 1 is a diagram of a fine fraction of the fine fraction of RAP employed in example 1 of the present invention;
FIG. 2 is a diagram of the recycled asphalt mortar prepared in example 1 of the present invention;
FIG. 3 is a histogram of the fusion rates of old and new asphalt in examples 2 to 4 of the present invention;
FIG. 4 is a diagram showing the RAP agglomeration phenomenon in the conventional thermal regeneration process according to comparative example 1 of the present invention.
FIG. 5 is a diagram showing the segregation phenomenon of 3-5 mm RAP fines and bitumen mixture in comparative example 2 according to the present invention.
Detailed Description
For a better understanding of the technical solution of the present invention, the following detailed description of the present invention is given with reference to the accompanying drawings and specific examples, which are not to be construed as limiting the scope of the examples.
In the embodiment of the specification, RAP fine materials (refined separation RAP fine materials) are obtained from a high-speed upper layer SMA-13 asphalt pavement milling material of Liaoning province and are separated by refined separation equipment produced by southern pavement machinery Co., ltd, the particle size is 0-3 mm, and the asphalt content is 11.07%.
The conventional RAP fine materials in the comparative example are from SMA-13 asphalt pavement milling materials on the upper layer of a certain expressway in Jiangsu, and are subjected to crushing and screening treatment, the particle size is 0-5 mm, and the asphalt content is 6.78%. 3-5 mmRAP fine materials are obtained from a high-speed upper layer SMA-13 asphalt pavement milling material in Liaoning province and are separated by a fine separation device produced by southern pavement machinery Co., ltd, the grain size is 3-5 mm, and the asphalt content is 4.85%. The aggregate is basalt aggregate and is derived from Jiangsu highway engineering maintenance limited company.
SBS modified asphalt purchased from Jiangsu Nantong sand asphalt technology Co.
Both the four-wire oil-based regenerant and the cocamidoethanol solubilizing agent were purchased from Jiangsu Louis engineering Co.
Example 1
The preparation method of the regenerated oil-rich mortar A comprises the following steps:
40 parts by mass of SBS modified asphalt is heated to 160 ℃, then 60 parts by mass of refined and separated RAP fine materials (shown in figure 1) are kept in an environment box at 140 ℃ for 3 hours, after moisture is completely dried, the mixture is added into asphalt liquid, the temperature of the whole system is maintained at 160 ℃, the mixture is stirred for 21 minutes at a rotating speed of 500RPM, and asphalt is completely fused, so that regenerated oil-rich mortar A is prepared, as shown in figure 2.
Example 2
The preparation of the regenerated oil-rich mortar B comprises the following steps:
Heating 39.7 parts by mass of SBS modified asphalt to 160 ℃, adding 0.4 part of a four-wire oil-based reducing regenerant and 0.2 part of cocoamidodiethanol cosolvent, and stirring for 10min to uniformly mix the components; and then preserving the temperature of 59.8 parts by mass of refined and separated RAP fine materials in an environment box at 140 ℃ for 3 hours, adding the refined and separated RAP fine materials into asphalt mixture after moisture is completely dried, maintaining the temperature of the whole system at 160 ℃, stirring at 500RPM for 18 minutes, and completely fusing asphalt to prepare regenerated oil-rich mortar B. Compared with example 1, the dissolution time is shortened by 3min by adding the four-wire oil-based regenerant and the cocoamide diethanol promoter.
Example 3
The preparation of the regenerated oil-rich mortar C comprises the following steps:
the mass ratio of the RAP fine materials to the modified asphalt to the regenerant to the solvent is 39.9:59.9:0.1:0.1;
59.9 parts by mass of SBS modified asphalt is heated to 160 ℃,0.1 part of four-wire oil-based regenerant and 0.1 part of cocoamidodiethanol cosolvent are added and stirred for 10min, so that the components are uniformly mixed; and then preserving the heat of 39.9 parts by mass of refined and separated RAP fines in an environment box at 140 ℃ for 3 hours, adding the RAP fines into the asphalt mixture after the moisture is completely dried, maintaining the temperature of the whole system at 160 ℃, stirring at 500RPM for 15 minutes, and completely fusing the asphalt to prepare the regenerated oil-rich mortar C.
Example 4
The preparation of the regenerated oil-rich mortar D comprises the following steps:
The mass ratio of the RAP fine materials to the modified asphalt to the regenerant to the solvent is 79.3:19.8:0.6:0.3.
Heating 19.8 parts by mass of SBS modified asphalt to 160 ℃, adding 0.6 part of a four-wire oil-based reducing regenerant and 0.3 part of cocoamidodiethanol cosolvent, and stirring for 10min to uniformly mix the components; and then preserving the heat of 79.3 parts by mass of refined and separated RAP fine materials in an environment box at 140 ℃ for 3 hours, adding the refined and separated RAP fine materials into asphalt mixture after moisture is completely dried, maintaining the temperature of the whole system at 160 ℃, stirring at 500RPM for 30 minutes, and completely fusing asphalt to prepare regenerated oil-rich mortar D.
Since the mass ratio of the RAP fines and the complete fusion time of the asphalt in examples 2 to 4 are different, the fusion rate of the new asphalt and the old asphalt cannot be measured, and therefore, the mass ratio of the aged asphalt in the RAP fines and the complete fusion time are used as the fusion rate of the new asphalt and the old asphalt, and the fusion rate of the introduced new asphalt and the old asphalt can be calculated by the formula (1).
Wherein V is the fusion rate of new asphalt and old asphalt, 1/min;
p-mass ratio of RAP fines added in examples;
a-asphalt content of RAP fines,%.
T-time of complete fusion of asphalt, min.
The new and old asphalt fusion rates of examples 2 to 4 were obtained, see fig. 3. It can be seen that the old and new bitumen fusion rate of example 2 is highest.
Comparative example 1
The conventional thermal regeneration process steps are as follows:
2.9 parts by mass of SBS modified asphalt and 57.1 parts by mass of aggregate are heated to 170 ℃ and 180 ℃ respectively for standby, then 40 parts by mass of conventional RAP fine materials are kept at the temperature of 140 ℃ in an environment box for 3 hours, after moisture is completely dried, the aggregate and the SBS modified asphalt are sequentially added and stirred in a stirrer at the temperature of 180 ℃ for 90 seconds, and a reclaimed asphalt mixture is prepared. As shown in fig. 4, the phenomenon of RAP agglomeration still exists, and the old asphalt cannot be fully fused and regenerated.
Comparative example 2
The steps for preparing the mortar by 3-5 mm RAP fines are as follows:
39.7 parts by mass of SBS modified asphalt is heated to 160 ℃, then 59.8 parts by mass of RAP fine materials (3-5 mm) are kept in an environment box at 140 ℃ for 3 hours, after moisture is completely dried, the mixture is added into asphalt liquid, the temperature of the whole system is maintained at 160 ℃, and the mixture is stirred at a rotating speed of 500RPM, so that the regenerated oil-rich asphalt mortar cannot be prepared. As shown in FIG. 5, after stirring was stopped, the mixture of RAP and asphalt solution could not be maintained in a stable state, the RAP fines (3-5 mm) were sunk and the asphalt solution was floated, and the two components were separated in layers.
Claims (9)
1. The preparation method of the regenerated rich oil mortar based on the refined separation technology is characterized by comprising the following steps of:
Step A, heating RAP fine materials in an oven at 130-140 ℃ for 2-4 hours, and drying water;
Step B, heating the modified asphalt to a flowing state at 160-180 ℃ and uniformly mixing to obtain an asphalt mixed solution;
And C, adding the RAP fine material treated in the step A into the asphalt mixture in the step B, maintaining the temperature of the whole system at 160-180 ℃, and stirring at 200-800 RPM for 15-40 min to obtain the regenerated oil-rich mortar.
2. The preparation method of regenerated oil-rich mortar based on the refined separation technology as claimed in claim 1, wherein the mass ratio of RAP fines to modified asphalt is (39.9-79.3): (19.8 to 59.9).
3. The preparation method of the regenerated oil-rich mortar based on the refined separation technology according to claim 1, wherein in the step B, after the modified asphalt is heated to a flowing state at 160-180 ℃, a regenerant and a solvent promoter are added and stirred for 5-10 min, so that the components are uniformly mixed to obtain an asphalt mixture.
4. The preparation method of regenerated oil-rich mortar based on the refined separation technology according to claim 3, which is characterized in that the mass ratio of RAP fines to modified asphalt to regenerant to solvent is (39.9-79.3): (19.8 to 59.9): (0.1 to 0.6): (0.1 to 0.3).
5. The preparation method of regenerated oil-rich mortar based on the refining separation technology as claimed in claim 1, wherein the RAP fine material is RAP material with the particle size smaller than 3mm and the asphalt content range of 6-12 wt% after separation by the refining separation technology.
6. The method for preparing regenerated oil-rich mortar based on the refined separation technology according to claim 1, wherein the modified asphalt is SBS modified asphalt.
7. The method for preparing regenerated oil-rich mortar based on refined separation technology according to claim 1, wherein the regenerant is at least one of vegetable oil-based, wire-reduced oil-based, waste organic oil-based and rubber oil-based regenerants.
8. The method for preparing regenerated oil-rich mortar based on a refined separation technology according to claim 1, wherein the solvent is at least one of cocoamidodiethanol, dodecylphenol and polyethylene glycol.
9. A reclaimed oil-rich mortar based on a refined separation technique prepared based on the method of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410122406.0A CN118084398A (en) | 2024-01-29 | 2024-01-29 | Regenerated oil-rich mortar based on refined separation technology and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410122406.0A CN118084398A (en) | 2024-01-29 | 2024-01-29 | Regenerated oil-rich mortar based on refined separation technology and preparation method thereof |
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| Publication Number | Publication Date |
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| CN118084398A true CN118084398A (en) | 2024-05-28 |
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| CN202410122406.0A Pending CN118084398A (en) | 2024-01-29 | 2024-01-29 | Regenerated oil-rich mortar based on refined separation technology and preparation method thereof |
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| Country | Link |
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| CN (1) | CN118084398A (en) |
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- 2024-01-29 CN CN202410122406.0A patent/CN118084398A/en active Pending
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