CN117720321A - Modified rubber reclaimed asphalt mixture and preparation method thereof - Google Patents
Modified rubber reclaimed asphalt mixture and preparation method thereof Download PDFInfo
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- CN117720321A CN117720321A CN202311623901.1A CN202311623901A CN117720321A CN 117720321 A CN117720321 A CN 117720321A CN 202311623901 A CN202311623901 A CN 202311623901A CN 117720321 A CN117720321 A CN 117720321A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 232
- 229920001971 elastomer Polymers 0.000 title claims abstract description 140
- 239000000203 mixture Substances 0.000 title claims abstract description 137
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 60
- 238000002156 mixing Methods 0.000 claims abstract description 41
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 39
- 230000023556 desulfurization Effects 0.000 claims abstract description 39
- 239000002245 particle Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 17
- 239000010920 waste tyre Substances 0.000 claims abstract description 17
- 239000011159 matrix material Substances 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 16
- 239000003607 modifier Substances 0.000 claims abstract description 14
- 239000000779 smoke Substances 0.000 claims abstract description 14
- 239000003381 stabilizer Substances 0.000 claims abstract description 13
- 239000002131 composite material Substances 0.000 claims abstract description 11
- -1 fatty amide compound Chemical class 0.000 claims abstract description 11
- IANQTJSKSUMEQM-UHFFFAOYSA-N benzofuran Natural products C1=CC=C2OC=CC2=C1 IANQTJSKSUMEQM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 9
- 239000000839 emulsion Substances 0.000 claims abstract description 8
- 230000001629 suppression Effects 0.000 claims abstract description 8
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 claims abstract description 6
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 6
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000011347 resin Substances 0.000 claims abstract description 6
- 229920005989 resin Polymers 0.000 claims abstract description 6
- 229940116411 terpineol Drugs 0.000 claims abstract description 6
- 229920000098 polyolefin Polymers 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 27
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical class [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 22
- 238000004064 recycling Methods 0.000 claims description 18
- 238000010008 shearing Methods 0.000 claims description 18
- 239000008149 soap solution Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000001993 wax Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 10
- RMVRSNDYEFQCLF-UHFFFAOYSA-N thiophenol Chemical compound SC1=CC=CC=C1 RMVRSNDYEFQCLF-UHFFFAOYSA-N 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- DCAYPVUWAIABOU-UHFFFAOYSA-N hexadecane Chemical compound CCCCCCCCCCCCCCCC DCAYPVUWAIABOU-UHFFFAOYSA-N 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 8
- FJLUATLTXUNBOT-UHFFFAOYSA-N 1-Hexadecylamine Chemical compound CCCCCCCCCCCCCCCCN FJLUATLTXUNBOT-UHFFFAOYSA-N 0.000 claims description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 7
- 239000004575 stone Substances 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 235000019738 Limestone Nutrition 0.000 claims description 6
- 239000006028 limestone Substances 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 229920000728 polyester Polymers 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 230000008961 swelling Effects 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims description 4
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 claims description 4
- 229940045348 brown mixture Drugs 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 4
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 4
- 235000012241 calcium silicate Nutrition 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 239000000084 colloidal system Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 4
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 claims description 4
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 claims description 4
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 4
- 239000012467 final product Substances 0.000 claims description 4
- CBFCDTFDPHXCNY-UHFFFAOYSA-N icosane Chemical compound CCCCCCCCCCCCCCCCCCCC CBFCDTFDPHXCNY-UHFFFAOYSA-N 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000003801 milling Methods 0.000 claims description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 229910021534 tricalcium silicate Inorganic materials 0.000 claims description 4
- 235000019976 tricalcium silicate Nutrition 0.000 claims description 4
- 150000004996 alkyl benzenes Chemical class 0.000 claims description 3
- 239000010440 gypsum Substances 0.000 claims description 3
- 229910052602 gypsum Inorganic materials 0.000 claims description 3
- 239000003208 petroleum Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 2
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical group C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 2
- 239000005662 Paraffin oil Substances 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 2
- 239000000806 elastomer Substances 0.000 claims description 2
- YSDQMSGRQWUYNF-INIZCTEOSA-N ethyl (2S)-2-(dodecylamino)propanoate Chemical compound C(C)OC([C@@H](NCCCCCCCCCCCC)C)=O YSDQMSGRQWUYNF-INIZCTEOSA-N 0.000 claims description 2
- WHPISZUUSVIBTD-HNNXBMFYSA-N methyl (2S)-2-(dodecylamino)propanoate Chemical compound CCCCCCCCCCCCN[C@@H](C)C(=O)OC WHPISZUUSVIBTD-HNNXBMFYSA-N 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 230000003213 activating effect Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 125000000499 benzofuranyl group Chemical group O1C(=CC2=C1C=CC=C2)* 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 239000000344 soap Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 11
- 238000012360 testing method Methods 0.000 description 10
- 239000011800 void material Substances 0.000 description 7
- 230000032683 aging Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 5
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 5
- 208000024780 Urticaria Diseases 0.000 description 4
- 239000011384 asphalt concrete Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000012492 regenerant Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- UYTOHYBIBPDOKX-ZDUSSCGKSA-N (2s)-2-(dodecanoylamino)propanoic acid Chemical compound CCCCCCCCCCCC(=O)N[C@@H](C)C(O)=O UYTOHYBIBPDOKX-ZDUSSCGKSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001877 deodorizing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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- 238000010998 test method 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
- Compositions Of Macromolecular Compounds (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a modified rubber reclaimed asphalt mixture and a preparation method thereof. The rubber reclaimed asphalt mixture comprises the following components: 90-100 parts of desulfurization activated rubber asphalt, which comprises desulfurization activated rubber, a modifier, matrix asphalt, an emulsifier, an emulsion stabilizer and water; 20 to 30 parts of external admixture is a composite cement material, 1 to 1.5 parts of warm mix agent is polyolefin and fatty amide compound, and 0.5 to 0.8 part of smoke suppression and viscosity reduction agent is coumarone resin, terpineol and aluminum hydroxide; the asphalt mixed recovery material is prepared by three particle sizes; 900-1100 parts of coarse and fine aggregate. The preparation method comprises the following steps: activating and desulfurizing the rubber powder of the waste tire, extracting and grading the original materials of the old asphalt pavement, preparing soap liquid, preparing modified rubber asphalt, mixing asphalt and aggregate, introducing an additive into the mixture, and obtaining the modified rubber reclaimed asphalt mixture. The effects of reducing environmental pollution and improving the durability and stability of the reclaimed asphalt are achieved.
Description
Technical Field
The invention belongs to the technical field of solid waste modification and recycling, and particularly relates to a modified rubber reclaimed asphalt mixture and a preparation method thereof.
Background
In recent years, china has undergone large-scale highway construction, and a continuous large-scale asphalt pavement maintenance and renovation stage is carried out at present, so that asphalt mixture produced in the process occupies a large amount of land, and resource waste and environmental pollution are caused. Therefore, how to reasonably and effectively utilize the asphalt mixed reclaimed materials to be reapplied to pavement construction and maintenance engineering, realize recycling of resources, achieve the purpose of protecting environment and have important practical significance.
Because the service time of the asphalt mixture reclaimed material is longer, the asphalt aging is serious, the combination of the matrix asphalt and the reclaimed material is insufficient, and the mixture is directly mixed with the matrix asphalt for regeneration, so that the construction and workability of the reclaimed material are poor. The waste tires contain rich anti-aging agents and various polymers, and the rubber asphalt prepared from the waste tires has better viscosity and is tightly combined with the mixture. The rubber asphalt is utilized to realize the regeneration of asphalt mixed reclaimed materials, realize the treatment of waste by waste and have great development potential.
Most of the domestic patents in the field mainly pay attention to the regeneration work of asphalt reclaimed materials by using a regenerant, and the research on road performance and the like is relatively perfect. However, there is no complete and systematic preparation method and application flow for recycling asphalt recycling materials by using rubber. According to the above reality, in combination with some of the rubber reclaimed asphalt mixture patents already published in China, it is found that the following problems still exist and need to be perfected:
1. the addition of rubber makes the regenerated asphalt mixture have higher viscosity and requires higher mixing and paving temperature in the production process. The asphalt flue gas and the hydrogen sulfide gas generated by the method are obviously increased, and the environmental quality and the health of constructors are seriously affected. Secondly, the high energy consumption and the high emission caused by the high viscosity are in sharp contradiction with the energy conservation and emission reduction advocated in the current society, and become the bottleneck of popularization and application of the rubber asphalt in the aspect of asphalt mixing, recycling and regeneration. In addition, the aging of asphalt cement can be caused by higher production temperature, so that the long-term service performance of the rubber asphalt is affected, and the durability and the aging resistance of the rubber reclaimed asphalt mixture are further reduced.
2. Most of the existing reclaimed asphalt is regenerated by adding a matrix asphalt and other regenerants, the use amount of the regenerant is changed slightly, so that the low-temperature crack resistance and the high-temperature resistance of the reclaimed asphalt are unbalanced, and the balance of the two properties is difficult to realize.
3. Asphalt in the asphalt mixed reclaimed material is seriously aged, most of viscosity and elasticity are lost, the adhesion of rubber asphalt and aggregate is hindered, the wrapping property of unmodified rubber asphalt on the reclaimed material is difficult to ensure, and segregation phenomenon easily occurs during production. And the storage and transportation stability is poor, and layering sedimentation phenomenon is easy to occur.
4. Because of the poor combination of asphalt in the reclaimed asphalt and reclaimed materials, especially the reclaimed asphalt with higher blending amount, the damping and elasticity of the reclaimed asphalt are difficult to reach the brand-new asphalt level. So that the reclaimed asphalt pavement cannot effectively absorb vibration and impact when the vehicle is running, thereby generating serious noise. Meanwhile, when the vehicle load is large or the vehicle speed is high, the regenerated asphalt pavement can deform, crack and dent displacement. While these deformations and displacements produce noise, the location of the deformations can also be a major source of long-term noise in asphalt pavement.
5. The existing reclaimed asphalt schemes have far different utilization degrees of different particle sizes. Particularly, the surface of the small-particle-size asphalt recycling material is adhered with more aged asphalt, and the durability of the reclaimed asphalt can be seriously affected when the reclaimed asphalt is directly put into use. And the consumption speed of the asphalt mixture reclaimed materials is low, and the recycling rate of the asphalt mixture reclaimed materials is low, so that the effect of solving the problem of accumulation of waste asphalt is not obvious enough.
Disclosure of Invention
The invention provides a modified rubber reclaimed asphalt mixture and a preparation method thereof, which are used for solving the problems of the reclaimed asphalt mixture during production, mixing and use. The method has the advantages of reducing the production energy consumption, saving energy, ensuring the durability, rutting resistance, low-temperature crack resistance and high-temperature resistance of the rubber reclaimed asphalt, reducing the driving noise and protecting the ecological environment. According to the invention, the desulfurization activation treatment is carried out on the waste tire rubber powder, the temperature in the production process is reduced, the emission of sulfur-containing harmful gases such as hydrogen sulfide and asphalt smoke can be effectively reduced, and the environment-friendly production of the rubber asphalt recycling mixture is realized. The modified rubber reclaimed asphalt mixture has good road performance and storage and transportation stability, and the ageing resistance and the fatigue resistance brought by the rubber asphalt are well reserved. Specifically, the technical scheme of the invention is as follows:
firstly, the invention provides a modified rubber reclaimed asphalt mixture, which comprises the following components in parts by weight: (1) 500-600 parts of asphalt mixed reclaimed materials are divided into 3 grades according to the grain sizes of 10-16 mm, 5-10 mm and 0-5 mm, and the mass ratio of the three grain sizes is 100 (140-170) to 80-100. (2) 900-1100 parts of coarse aggregate, which is obtained by mixing coarse aggregate with the mass ratio of 60-70% and fine aggregate with the mass ratio of 30-40%. (3) 90-100 parts of desulphurized activated rubber asphalt. (4) 20-30 parts of external admixture, which is a composite cement material. (5) 1 to 1.5 parts of warm mixing agent which is polyolefin and fatty amide compound. (6) 0.5 to 0.8 part of smoke suppression viscosity reducer is prepared from coumarone resin, terpineol and aluminum hydroxide according to the proportion of 1 (1 to 1.4) to 1.25 to 1.65.
In the modified rubber reclaimed asphalt mixture, the coarse aggregate is hard stone, does not contain weathered particles and is similar to broken stone of cubic particles, the particle size is larger than 2.36mm, the water absorption is smaller than 3%, the apparent relative density is larger than 2.6%, and basalt aggregate or diabase aggregate is preferentially adopted. The fine aggregate is hard, clean, dry, free of air change and impurities, the apparent relative density is more than 2.6%, the mud content is less than 2.8%, the sand equivalent is more than 60%, and the fine aggregate is preferably selected from artificial rolling basalt, diabase or limestone with proper grading.
The external admixture is a composite cement material, and comprises the following components: c (C) 4 A 3 6.8 to 10.2 parts of S (anhydrous calcium sulfoaluminate) and C 2 6.4 to 9.7 parts of S (dicalcium silicate) and C 4 AF (tetracalcium aluminoferrite) 1.4-2.2 parts, C 3 2.0 to 3.1 parts of S (tricalcium silicate) and C 3 1.4 to 2.1 parts of A (tricalcium aluminate), 0.9 to 1.4 parts of gypsum and 0.8 to 1.2 parts of limestone; the warm mixing agent is polyolefin and fatty amide compounds, and preferably, the polyolefin and fatty amide compound modifier is one or more of polyamide wax, polyethylene elastomer wax and polytetrafluoroethylene wax; the smoke suppressing and deodorizing agent is coumarone resin, terpineol and aluminum hydroxide in the ratio of 1 (1-1.4) (1.25-1.65).
The modified rubber regenerated asphalt mixture comprises the following components: 30 to 40 parts of desulfurization activated rubber, 3 to 4 parts of modifier, 120 to 160 parts of matrix asphalt, 4.5 to 10.2 parts of emulsifier, 0.3 to 1.1 parts of emulsion stabilizer and 40 to 65 parts of water;
the modified rubber regenerated asphalt mixture is prepared by mixing SBS, polyvinyl alcohol wax and polyester borer according to the mass ratio of 100 (92-100) (43-51), wherein the dosage is 10-12% based on the percentage of the desulfurization activated rubber.
The matrix asphalt of the modified rubber reclaimed asphalt mixture is 70# petroleum asphalt.
The modified rubber reclaimed asphalt mixture is characterized in that the emulsifier is one or more of laurylalanine ethyl ester, laurylalanine methyl ester and laurylalanine ethoxyethyl ester, and the dosage is 3-5% based on the weight percentage of 2% of the mixture; the emulsion stabilizer is one or more of paraffin oil, eicosane oil, hexadecane oil and dodecane oil, and the dosage is 0.2-0.4 percent based on the weight percentage of 2 percent of the mixture.
The preparation method of the modified rubber reclaimed asphalt mixture comprises the following steps:
(1) Milling and crushing the old asphalt pavement, and controlling the grain size of the final product to be not more than 16mm by using a screening method to obtain an asphalt mixed raw material.
(2) Separating aggregate in the asphalt mixture raw material from aged asphalt by adopting normal hexane at 150-160 ℃, separating the aged asphalt from a solvent by utilizing the rotation speed of a centrifugal machine of 5000r/min, and recycling the solvent to obtain an asphalt mixture reclaimed material. So that the asphalt content of the asphalt reclaimed material with the particle diameter of more than 5mm is not more than 2.75 percent, and the equivalent of the asphalt reclaimed material sand with the particle diameter of less than 5mm is not less than 60 percent.
(3) Grading the reclaimed materials according to three grades of 10-16 mm, 5-10 mm and 0-5 mm of grain size to obtain asphalt mixed reclaimed materials;
the preparation method of the modified rubber reclaimed asphalt mixture comprises the following steps:
(1) Weighing a sufficient amount of 40-60 mesh waste tire rubber powder, adding a saturated NaOH solution, fully stirring, and soaking for 1h. (2) And (3) after taking out, adding the mixture into the recovered oil, fully stirring and swelling for 4 hours, taking out again, and drying to obtain the activated rubber.
(3) Mixing the activated rubber with a desulfurizing agent, a desulfurizing accelerator and a desulfurizing stabilizer, adding the mixture into a double-screw extruder at 230-280 ℃ through a hopper for desulfurizing treatment, reacting for 4-10 min under the extrusion pressure of 4-12 Mpa, and shearing and extruding at 100r/min to obtain the desulfurized activated rubber.
According to the preparation method of the modified rubber reclaimed asphalt mixture, the desulfurizing agent is benzoyl peroxide and/or phenyl mercaptan, and the use amount of the desulfurizing agent is 10-12% based on the percentage of the rubber powder of the waste tire. The desulfurization accelerator is one or more of hexadecylamine, hexadecylamine and hexadecylamine, and the dosage of the desulfurization accelerator is 5-8% based on the percentage of the rubber powder of the waste tire. The desulfurization stabilizer is recovered oil added with 7-10% of alkylbenzene by mass, and the dosage is 5-8% based on the percentage of the rubber powder of the waste tire.
The preparation method of the modified rubber reclaimed asphalt mixture comprises the following steps:
s1: pretreatment of raw materials:
(1) Crushing, screening, extracting and the like pre-treating the old road pavement asphalt according to the description, and grading to obtain an asphalt mixed reclaimed material;
(2) Desulfurizing and activating the rubber powder of the waste tires according to the description to obtain desulfurizing and activating rubber;
s2: preparing desulfurization activated rubber asphalt:
(1) Heating matrix asphalt to 170-180 ℃, then weighing 30-40 parts of desulfurization activated rubber, mixing 3-4 parts of modifier, adding the mixture into 120-160 parts of matrix asphalt, heating to 180-190 ℃, and stirring and developing for 20min to obtain a mixture 1.
(2) After the stirring is completed, the mixture 1 is moved into a shearing machine, the shearing rotation speed is 5,500r/min at 170-190 ℃, and the shearing is carried out for 1h, so that the mixture 2 is prepared.
(3) 100-135 parts of deionized water is weighed and heated to 60 ℃, and a small amount of NaOH is added to adjust the solution to an alkaline environment.
(4) Adding 4.5-10.2 parts of emulsifier and 0.3-1.1 parts of emulsion stabilizer into deionized water, stirring at a constant temperature of 60 ℃ for 20min, and adding NaOH to adjust the pH value of the soap solution to 12 in a stirring process to prepare the soap solution.
(5) Heating the prepared mixture 2 to 160 ℃, mixing the mixture 2 and the soap solution according to the proportion of 6-5.5:4-4.5 under the condition of the soap solution of 60 ℃, adding the mixture into a colloid mill or a high-speed cutting machine, and shearing and dispersing for 5-10 min at 300-400 r/min to form a brown mixture with uniform texture, thereby preparing the desulfurization activated rubber asphalt. S3: preparing a modified rubber reclaimed asphalt mixture:
(1) Mixing the asphalt mixed reclaimed material with the desulfurization activated rubber asphalt and the smoke suppression viscosity reducer at 140-150 ℃ for preheating, mixing the asphalt mixed reclaimed material with coarse and fine aggregates, adding the coarse and fine aggregates into a stirrer, and heating and stirring for 10min at 170-180 ℃.
(2) Adding warm mixing agent and external admixture, mixing and stirring for 20min to obtain the modified rubber reclaimed asphalt mixture.
The beneficial effects of the invention are as follows:
1. the invention reduces the production temperature by carrying out activation pretreatment on the rubber powder of the waste tire and the reclaimed asphalt and combining the method for producing the rubber asphalt at low temperature. In addition, by adding a warm mix agent to the modified rubber reclaimed asphalt mixture, the temperature of the mixture during mixing and transportation and storage is reduced. Therefore, the energy consumption is reduced, and the social resources are saved. The invention reduces the emission of hydrogen sulfide gas and asphalt smoke in the whole process of preparing the modified rubber reclaimed asphalt mixture by desulfurizing the rubber powder while reducing the production temperature.
2. The reduction of the production temperature avoids the advanced aging of the asphalt cement, so that the long-term use performance of the rubber asphalt for oxidization resistance is preserved, and the durability and the aging resistance of the rubber reclaimed asphalt mixture are improved. In addition, when the desulfurization activated rubber asphalt is prepared, the SBS, the polyvinyl alcohol wax and the polyester fiber mixed modifier are added, so that saturated distribution in the asphalt is absorbed at high temperature to generate swelling, the chain structure of the macromolecular polymer is stretched, the volume is increased, the polymer is converted into a continuous phase from a disperse phase, and asphalt and rubber particles are distributed in a connecting phase. Thereby enhancing the bonding strength between asphalt aggregates and improving the heat resistance and rutting resistance of the rubber reclaimed asphalt mixture. The compound cement admixture reacts with the cementing material in the asphalt concrete to generate chemical bond and physical adsorption, so that the high-strength cement cementing material with good water resistance and crack resistance can be formed; the compound cement fills the gaps of the asphalt mixture, and further improves the durability and the stability of the regenerated asphalt mixture.
3. In the invention, the modified rubber asphalt subjected to desulfurization activation treatment has larger surface area, can generate good bonding effect with coarse and fine aggregates and the pretreated asphalt mixed reclaimed materials, improves the wrapping property of the rubber asphalt on the reclaimed materials, avoids the segregation phenomenon during production, and ensures that the reclaimed asphalt mixture has better storage and transportation stability.
4. Compared with common reclaimed asphalt, the rubber asphalt prepared by the invention has better elasticity and damping performance, so that the vibration and impact generated by the road surface can be absorbed and reduced, and meanwhile, the road surface can be more stable, thereby reducing the noise of the road surface.
5. According to the invention, the old asphalt recycling mixture is subjected to pretreatment such as screening, grading, extraction and the like, so that asphalt recycling mixtures with different particle sizes are fully utilized, and the problem that the small-particle-size asphalt recycling mixture is difficult to utilize due to excessive aged asphalt is solved. The recycling rate of the mixture is about 30%, and compared with the asphalt regenerated by the regenerant, the recycling efficiency of waste resources is improved, and the problems of water and soil resource pollution and land occupation caused by accumulation of the waste asphalt can be well solved.
Drawings
FIG. 1 is a schematic diagram of a process flow of a modified rubber reclaimed asphalt mixture.
Detailed Description
The following embodiments will clearly and completely demonstrate the concept, objects, technical solutions and effects of the present invention. It is to be understood that the embodiments described are merely examples of some of the invention, which are representative and serve to illustrate the application.
Example 1
The preparation method of the modified rubber reclaimed asphalt mixture comprises the following steps:
s1: pretreatment of raw materials:
(1) Preparing asphalt mixing reclaimed materials:
milling and crushing old asphalt pavement, and controlling the grain size of a final product to be not more than 16mm by using a screening method to obtain an asphalt mixed raw material; separating aggregate in the asphalt mixture raw material from aged asphalt by adopting normal hexane at 150 ℃, separating the aged asphalt from a solvent by utilizing the rotation speed of a centrifugal machine of 5000r/min, and recycling the solvent to obtain an asphalt mixture reclaimed material; so that the asphalt content of the asphalt reclaimed material with the particle diameter of more than 5mm is not more than 2.75 percent, and the equivalent weight of the asphalt reclaimed material sand with the particle diameter of less than 5mm is not less than 60 percent; according to the grain size of 3 grades, respectively 10-16 mm, 5-10 mm and 0-5 mm, the mass ratio of the three grain sizes is 100:140:80 to prepare the asphalt mixed reclaimed material.
(2) Preparing desulfurization activated rubber:
firstly, 40 parts of waste tire rubber powder is added into a saturated NaOH solution, fully stirred and soaked for 1h. And (3) after taking out, adding the mixture into the recovered oil, fully stirring and swelling for 4 hours, taking out again, and drying to obtain the activated rubber. Then mixing the rubber with 4 parts of phenyl mercaptan, 2 parts of hexadecylamine and 2 parts of recovered oil added with 8% of alkylbenzene by mass, adding the mixture into a double-screw extruder at the temperature of 280 ℃ through a hopper for desulfurization treatment, reacting for 4min under the extrusion pressure of 6Mpa, and shearing and extruding at 100r/min to obtain the desulfurization activated rubber.
S2: preparing desulfurization activated rubber asphalt:
(1) Heating matrix asphalt to 170 ℃, then weighing 30 parts of desulfurization activated rubber and 3 parts of modifier, adding the mixture into 120 parts of matrix asphalt, heating to 180 ℃, and stirring and developing for 20min to obtain a mixture 1. Wherein the modifier is prepared from SBS, polyvinyl alcohol wax and polyester fiber according to the mass ratio of 100:95:45.
(2) After the completion of the stirring, the mixture 1 was transferred into a shearing machine at a shearing rotation speed of 5,500r/min at 180℃and sheared for 1 hour to prepare a mixture 2.
(3) A certain mass of deionized water is weighed and heated to 60 ℃, and a small amount of NaOH is added to adjust the solution to an alkaline environment.
(4) 5 parts of lauroyl alanine methyl ester and 0.5 part of hexadecane oil are added into deionized water, and the mixture is stirred for 20 minutes at the constant temperature of 60 ℃, naOH is added in the stirring process for adjusting the pH value of the soap solution, so as to prepare the soap solution.
(5) And heating the prepared mixture 2 to 160 ℃, wherein the soap solution is 60 ℃, and under the condition that the pH of the soap solution is=12, mixing the mixture 2 and the soap solution according to the proportion of 5.5:4.5, adding the mixture into a colloid mill or a high-speed cutting machine, and shearing and dispersing the mixture for 5min at 400r/min to form a brown mixture with uniform texture, thereby preparing the desulfurization activated rubber asphalt.
S3: preparing a modified rubber reclaimed asphalt mixture:
(1) Mixing 500 parts of asphalt recycling material with 90 parts of desulfurization activated rubber asphalt and 0.5 part of smoke suppression viscosity reducer prepared from coumarone resin, terpineol and aluminum hydroxide according to a ratio of 1:1:1.25 at 150 ℃ for preheating, mixing the mixture with 900 parts of coarse and fine aggregates, adding the mixture into a stirrer, and heating and stirring for 10min at 170 ℃.
(2) Adding 1 part of polyamide wax and 20 parts of composite cement material, mixing and stirring for 20min to obtain the modified rubber reclaimed asphalt mixture.
Wherein the coarse aggregate is obtained by mixing coarse aggregate with the mass ratio of 60% and fine aggregate with the mass ratio of 40%. The coarse aggregate adopts basalt aggregate which is hard in stone, does not contain weathered particles and approximates to cubic particles, has the particle size of more than 2.36mm, the water absorption rate of less than 3 percent and the apparent relative density of more than 2.6 percent. The fine aggregate is made of the artificial rolling basalt fine aggregate which is hard, clean, dry, free of air change and impurities, has apparent relative density of more than 2.6%, mud content of less than 2.8%, sand equivalent of more than 60% and proper grading. The composite cement material comprises the following components: c (C) 4 A 3 S (anhydrous calcium sulfoaluminate) 6.9 parts, C 2 S (dicalcium silicate) 6.5 parts, C 4 AF (tetracalcium aluminoferrite) 1.4 parts, C 3 S (tricalcium silicate) 2.0 parts, C 3 1.4 parts of A (tricalcium aluminate), 1 part of gypsum and 0.8 part of limestone.
The following table shows the test results of the modified rubber asphalt mixture prepared in example 1 of the present invention:
| detecting items | Typical test results | Technical requirements |
| Wheal ratio (%) | 6.3 | / |
| Void fraction (%) | 4.0 | 3-4.5 |
| Marshall stability (kN) | 10.45 | ≥8.0 |
| Residual stability (%) | 93.2 | ≥85 |
| Freeze-thaw split intensity ratio (%) | 88.3 | ≥85 |
| Dynamic stability (times/mm) | 6237 | ≥5000 |
| Low temperature flexural tensile strain (mu epsilon) | 2984 | ≥2500 |
Example 2
The preparation method of the modified rubber reclaimed asphalt mixture comprises the following steps:
s1: pretreatment of raw materials:
(1) Preparing asphalt mixing reclaimed materials:
milling and crushing old asphalt pavement, and controlling the grain size of a final product to be not more than 16mm by using a screening method to obtain an asphalt mixed raw material; separating aggregate in the asphalt mixture raw material from aged asphalt by adopting normal hexane at 160 ℃, separating the aged asphalt from a solvent by utilizing the rotation speed of a centrifugal machine of 5000r/min, and recycling the solvent to obtain an asphalt mixture reclaimed material; so that the asphalt content of the asphalt reclaimed material with the particle diameter of more than 5mm is not more than 2.75 percent, and the equivalent weight of the asphalt reclaimed material sand with the particle diameter of less than 5mm is not less than 60 percent; according to the grain size of 3 grades, respectively 10-16 mm, 5-10 mm and 0-5 mm, the mass ratio of the three grain sizes is 100:160:100, and the asphalt mixed reclaimed material is prepared.
(2) Preparing desulfurization activated rubber:
firstly, 50 parts of waste tire rubber powder is added into a saturated NaOH solution, fully stirred and soaked for 1h. And (3) after taking out, adding the mixture into the recovered oil, fully stirring and swelling for 4 hours, taking out again, and drying to obtain the activated rubber. Then mixing the rubber with 5 parts of desulfurizing agent, 3 parts of desulfurizing accelerator and 3 parts of desulfurizing stabilizer, adding the mixture into a double-screw extruder at 240 ℃ through a hopper for desulfurizing treatment, reacting for 8min under the extrusion pressure of 10Mpa, and shearing and extruding at 100r/min to obtain the desulfurized activated rubber.
S2: preparing desulfurization activated rubber asphalt:
(6) Heating matrix asphalt to 170 ℃, then weighing 30 parts of desulfurization activated rubber and 3 parts of modifier, adding the mixture into 120 parts of matrix asphalt, heating to 180 ℃, and stirring and developing for 20min to obtain a mixture 1. Wherein the modifier is prepared from SBS, polyvinyl alcohol wax and polyester fiber according to the mass ratio of 100:100:50.
(1) After the completion of the stirring, the mixture 1 was transferred into a shearing machine at a shearing rotation speed of 5,500r/min at 180℃and sheared for 1 hour to prepare a mixture 2.
(2) A certain mass of deionized water is weighed and heated to 60 ℃, and a small amount of NaOH is added to adjust the solution to an alkaline environment.
(3) 5 parts of lauroyl alanine methyl ester and 0.5 part of hexadecane oil are added into deionized water, and the mixture is stirred for 20 minutes at the constant temperature of 60 ℃, naOH is added in the stirring process for adjusting the pH value of the soap solution, so as to prepare the soap solution.
(4) Heating the prepared mixture 2 to 160 ℃, and under the conditions of soap solution 60 ℃ and soap solution pH=12, mixing the mixture 2 and the soap solution according to the ratio of 6:4, adding the mixture into a colloid mill or a high-speed cutting machine, and shearing and dispersing for 8min at 300r/min to form a brown mixture with uniform texture, thereby preparing the desulfurization activated rubber asphalt.
S3: preparing a modified rubber reclaimed asphalt mixture:
(1) 550 parts of asphalt mixture reclaimed materials, 100 parts of desulfurated activated rubber asphalt, 0.8 part of coumarone resin, terpineol and aluminum hydroxide are mixed according to the proportion of 1:1.2:1.6 to prepare smoke suppression viscosity reducer for preheating at 150 ℃, and then the smoke suppression viscosity reducer is mixed with 1000 parts of coarse and fine aggregates and added into a stirrer, and heated and stirred for 10min at 170 ℃.
(2) Adding 1.5 parts of polyamide wax and 30 parts of composite cement material, mixing and stirring for 20min to obtain the modified rubber reclaimed asphalt mixture.
Wherein the coarse aggregate is obtained by mixing coarse aggregate with the mass ratio of 70% and fine aggregate with the mass ratio of 30%. The coarse aggregate adopts basalt aggregate which is hard in stone, does not contain weathered particles and approximates to cubic particles, has the particle size of more than 2.36mm, the water absorption rate of less than 3 percent and the apparent relative density of more than 2.6 percent. The fine aggregate is made of the artificial rolling basalt fine aggregate which is hard, clean, dry, free of air change and impurities, has apparent relative density of more than 2.6%, mud content of less than 2.8%, sand equivalent of more than 60% and proper grading. The composite cement material comprises the following components: c (C) 4 A 3 10.2 parts of S (anhydrous calcium sulfoaluminate), C 2 S (dicalcium silicate) 9.7 parts, C 4 AF (tetracalcium aluminoferrite) 2.2 parts, C 3 S (tricalcium silicate) 3.1 parts, C 3 2.1 parts of A (tricalcium aluminate) and 1 part of gypsum5 parts of limestone and 1.2 parts of water.
The following table shows the test results of the modified rubber asphalt mixture prepared in example 2 of the present invention:
| detecting items | Typical test results |
| Wheal ratio (%) | 5.9 |
| Void fraction (%) | 4.3 |
| Marshall stability (kN) | 11.76 |
| Residual stability (%) | 93.5 |
| Freeze-thaw split intensity ratio (%) | 88.7 |
| Dynamic stability (times/mm) | 6848 |
| Low temperature flexural tensile strain (mu epsilon) | 3103 |
Example 3
The preparation method of the reclaimed rubber asphalt mixture is different from that of the embodiment 2 in that in the step S3, the weight ratio of the asphalt mixture reclaimed material to the coarse and fine aggregates is 1:2, namely 500 parts of the asphalt mixture reclaimed material and 1000 parts of the coarse and fine aggregates.
The following table shows the test results of the modified rubber asphalt mixture prepared in example 3 of the present invention:
| detecting items | Typical test results |
| Wheal ratio (%) | 6.0 |
| Void fraction (%) | 4.1 |
| Marshall stability (kN) | 10.88 |
| Residual stability (%) | 94.8 |
| Freeze-thaw split intensity ratio (%) | 89.0 |
| Dynamic stability (times/mm) | 7164 |
| Low temperature flexural tensile strain (mu epsilon) | 3290 |
Comparative example 1
A method for preparing a reclaimed rubber asphalt mixture, which is different from example 2 in that comparative example 1 does not use a composite cement admixture in step S3.
The following table shows the test and detection results of the modified rubber asphalt mixture prepared in comparative example 1 of the present invention:
| detecting items | Typical test results |
| Wheal ratio (%) | 5.9 |
| Void fraction (%) | 4.6 |
| Marshall stability (kN) | 8.35 |
| Residual stability (%) | 86.3 |
| Freeze-thaw split intensity ratio (%) | 82.7 |
| Dynamic stability (times/mm) | 4227 |
| Low temperature flexural tensile strain (mu epsilon) | 2201 |
Comparative example 2
A method for preparing a reclaimed rubber asphalt mixture, which is different from example 2 in that in comparative example 1, in step S2, a modifier is replaced with SBS.
The following table shows the test and detection results of the modified rubber asphalt mixture prepared in comparative example 2 of the present invention:
as can be seen from the detection results of the asphalt mixtures in examples 1, 2 and 3, the modified rubber reclaimed asphalt mixture prepared by the invention has various indexes such as Marshall stability, dynamic stability and the like which meet the related requirements of the specification of the construction technical Specification of Highway asphalt pavement (JTG F40-2004).
Meanwhile, with the increase of the percentage content of the modified rubber asphalt, the dynamic stability, the flexural tensile strain, the freeze-thawing splitting strength ratio and the soaking Marshall residual stability in the examples 1-3 also show the tendency of rising and then falling, so that the examples 2 and 3 have better properties in the aspects, and the proportion is more favorable for the stability and the durability of the asphalt mixture. Meanwhile, as the percentage content of the modified rubber asphalt increases, the dynamic stability tends to decrease, and the main reason is that free asphalt appears in the asphalt mixture due to the increase of the asphalt content, so that the internal friction and stability between fresh aggregates are reduced, and the dynamic stability correspondingly decreases.
From the detection results, the oil-stone ratio of examples 2 and 3 is smaller than that of example 1, but the void ratios of the three are not quite different, and the analysis is that the shrinkage and hardening of the cement can tightly fill the void due to the increase of the content of the external admixture of the composite cement, so that the void ratio of the mixture is kept relatively stable. It is apparent that examples 2 and 3 have better performances in terms of crack resistance and water resistance, and the main reason is that the external admixture composite cement can form a cementing material with good water resistance and crack resistance in asphalt concrete, and can play an effective role in preventing water and cracks, so that the service life of the asphalt concrete is prolonged, and the durability is improved.
As can be seen by comparison, the indexes of the comparative example 1 can not meet the technical requirements or are positioned at the edges of the technical requirements, and the indexes such as the freeze thawing splitting strength ratio, the low-temperature bending tensile strain and the like are obviously reduced. Therefore, the mixture prepared in the comparative example 1 has poor stability and durability, and cannot meet the application and construction requirements.
In comparative example 2, since excessive SBS was added in comparative example 2, the thermal stability was further improved, and thus the Marshall stability and dynamic stability were improved in the test results. However, other performance indexes (such as low-temperature bending tensile strain, residual stability and the like) cannot meet the technical requirements of construction and use in the industry, and thus, it is seen that the comparative example 2 has poor low-temperature cracking resistance, water resistance and durability and cannot be put into use.
Hydrogen sulfide and petroleum asphalt (smoke) were sampled and detected according to GBZ 159-2004, sampling Specification for monitoring harmful substances in workplace air. Examples 1, 2, 3 concentration of Hydrogen sulfide in air at Critical locations during production and mixing<0.53mg/m 3 The asphalt smoke emission concentration is 2.6-3.5 mg/m 3 Compared with other rubber reclaimed asphalt mixture asphalt smoke emission is reduced by 60-70%. Meets the requirements related to the industrial standard of GBZ 2.1.1-2019/XG 1-2022, part 1 of the professional contact limit of all harmful factors of working field, namely chemical harmful factors.
The traffic method is a road noise test method specified by the ISO organization, and is mainly used for static measurement through a precise sound pressure meter arranged beside a road and is specially used for determining the noise level of a tire and determining the relationship between the rolling noise of the tire and factors such as the road surface property, the tire property and the like. Secondly, the vehicle-mounted method is a dynamic noise measuring method for measuring noise level by arranging a sound collecting device on a carrier and collecting noise in the driving process. The actual noise levels of the rubber reclaimed asphalt pavement and the common reclaimed asphalt pavement are tested by combining a vehicle-mounted method and a traffic method, and the noise value of the rubber reclaimed asphalt concrete pavement is 2.1-5.2 dB lower than that of the common reclaimed asphalt pavement through comparison.
It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the exemplary embodiments should be considered in all respects as illustrative and not restrictive. Furthermore, it should be understood that, although the present disclosure describes one embodiment, the present disclosure is not limited to one embodiment. The description is given for clarity only. The skilled person will understand the entire description as a whole and may form other embodiments that will be understood by the skilled person by appropriate combinations of the technical solutions in the exemplary embodiments.
Claims (10)
1. The modified rubber reclaimed asphalt mixture is characterized by comprising the following components in parts by weight:
(1) 500-600 parts of asphalt mixed reclaimed materials, which are divided into 3 grades according to the grain size, namely 10-16 mm, 5-10 mm and 0-5 mm, wherein the mass ratio of the three grain sizes is 100 (140-170) (80-100);
(2) 900-1100 parts of coarse aggregate, which is obtained by mixing coarse aggregate with the mass ratio of 60-70% and fine aggregate with the mass ratio of 30-40%;
(3) 90-100 parts of desulfurization activated rubber asphalt, which comprises desulfurization activated rubber, a modifier, matrix asphalt, an emulsifier, an emulsion stabilizer and water;
(4) 20-30 parts of external admixture which is a composite cement material;
(5) 1 to 1.5 parts of warm mixing agent which is polyolefin and fatty amide compound;
(6) 0.5 to 0.8 part of smoke suppression viscosity reducer is prepared from coumarone resin, terpineol and aluminum hydroxide according to the proportion of 1 (1 to 1.4) to 1.25 to 1.65.
2. The modified rubber reclaimed asphalt mixture of claim 1 wherein: among the coarse and fine aggregates, the coarse aggregate adopts stone hard broken stone which does not contain weathered particles and is similar to cubic particles, the particle size is larger than 2.36mm, the water absorption is smaller than 3 percent, the apparent relative density is larger than 2.6 percent, and basalt aggregate or diabase aggregate is preferentially adopted; the fine aggregate is hard, clean, dry, free of air change and impurities, the apparent relative density is more than 2.6%, the mud content is less than 2.8%, the sand equivalent is more than 60%, and the fine aggregate is preferably selected from artificial rolling basalt, diabase or limestone with proper grading.
3. The modified rubber reclaimed asphalt mixture of claim 1 wherein: the desulfurization activated rubber asphalt comprises the following components: 30 to 40 parts of desulfurization activated rubber, 3 to 4 parts of modifier, 120 to 160 parts of matrix asphalt, 4.5 to 10.2 parts of emulsifier, 0.3 to 1.1 parts of emulsion stabilizer and 40 to 65 parts of water;
the warm mixing agent is one or more of polyamide wax, polyethylene elastomer wax and polytetrafluoroethylene wax; the external admixture component comprises: c (C) 4 A 3 6.8 to 10.2 parts of S (anhydrous calcium sulfoaluminate) and C 2 6.4 to 9.7 parts of S (dicalcium silicate) and C 4 AF (tetracalcium aluminoferrite) 1.4-2.2 parts, C 3 2.0 to 3.1 parts of S (tricalcium silicate) and C 3 1.4 to 2.1 portions of A (tricalcium aluminate), 0.9 to 1.4 portions of gypsum and 0.8 to 1.2 portions of limestone.
4. The modified rubber reclaimed asphalt mixture of claim 1 wherein: the modifier is prepared by mixing SBS, polyvinyl alcohol wax and polyester borer according to the mass ratio of 100 (92-100) (43-51), and the dosage is 10-12% based on the percentage of the desulfurization activated rubber.
5. The modified rubber reclaimed asphalt mixture of claim 1, wherein the base asphalt is 70# petroleum asphalt.
6. The modified rubber reclaimed asphalt mixture according to claim 1, wherein the emulsifier is one or more of laurylalanine ethyl ester, laurylalanine methyl ester and laurylalanine ethoxyethyl ester, and the amount of the emulsifier is 3-5% based on the mass percentage of 2% of the mixture; the emulsion stabilizer is one or more of paraffin oil, eicosane oil, hexadecane oil and dodecane oil, and the dosage is 0.2-0.4 percent based on the weight percentage of 2 percent of the mixture.
7. The modified rubber reclaimed asphalt mixture of claim 1 wherein: the preparation method of the asphalt mixture reclaimed material comprises the following steps:
(1) Milling and crushing old asphalt pavement, and controlling the grain size of a final product to be not more than 16mm by using a screening method to obtain an asphalt mixed raw material;
(2) Separating aggregate in the asphalt mixture raw material from aged asphalt by adopting normal hexane at 150-160 ℃, separating the aged asphalt from a solvent by utilizing the rotation speed of a centrifugal machine of 5000r/min, and recycling the solvent, so that the asphalt content of the asphalt reclaimed material with the particle size of more than 5mm is not more than 2.75%, and the equivalent of asphalt reclaimed material sand with the particle size of less than 5mm is not less than 60%;
(3) Grading the reclaimed materials according to three grades of 10-16 mm, 5-10 mm and 0-5 mm of grain size to obtain the asphalt mixed reclaimed materials.
8. The modified rubber reclaimed asphalt mixture of claim 1 wherein: the preparation method of the devulcanized activated rubber comprises the following steps:
(1) Weighing a sufficient amount of 40-60 mesh waste tire rubber powder, adding a saturated NaOH solution, fully stirring, and soaking for 1h; (2) Fishing out, adding the mixture into the reclaimed oil, fully stirring and swelling for 4 hours, fishing out again, and drying to obtain activated rubber;
(3) Mixing the activated rubber with a desulfurizing agent, a desulfurizing accelerator and a desulfurizing stabilizer, adding the mixture into a double-screw extruder at 230-280 ℃ through a hopper for desulfurizing treatment, reacting for 4-10 min under the extrusion pressure of 4-12 Mpa, and shearing and extruding at 100r/min to obtain the desulfurized activated rubber.
9. The modified rubber reclaimed asphalt mixture of claim 8 wherein: the desulfurizing agent is benzoyl peroxide and/or phenyl mercaptan, and the dosage of the desulfurizing agent is 10-12% based on the percentage of the waste tire rubber powder; the desulfurization accelerator is one or more of hexadecylamine, hexadecylamine and hexadecylamine, and the dosage of the desulfurization accelerator is 5-8% based on the percentage of the waste tire rubber powder; the desulfurization stabilizer is recovered oil added with 7-10% of alkylbenzene by mass, and the dosage is 5-8% based on the percentage of the rubber powder of the waste tire.
10. The modified-rubber reclaimed asphalt mixture as claimed in any one of claims 1 to 9, wherein the modified-rubber reclaimed asphalt mixture preparation method comprises the steps of:
s1: pretreatment of raw materials:
(1) According to claim 7, crushing, screening, extracting and other pretreatment of old road pavement asphalt, grading to obtain asphalt mixed reclaimed materials;
(2) The method comprises the steps of performing desulfurization and activation treatment on waste tire rubber powder according to claim 8 to obtain desulfurization activated rubber;
s2: preparing desulfurization activated rubber asphalt:
(1) Heating matrix asphalt to 170-180 ℃, then weighing 30-40 parts of desulfurization activated rubber, mixing 3-4 parts of modifier, adding the mixture into 120-160 parts of matrix asphalt, heating to 180-190 ℃, and stirring and developing for 20min to obtain a mixture 1;
(2) After stirring, moving the mixture 1 into a shearing machine, shearing at 170-190 ℃ at a shearing speed of 5,500r/min for 1h to prepare a mixture 2;
(3) Weighing 100-135 parts of deionized water, heating to 60 ℃, and adding a small amount of NaOH to adjust the solution to an alkaline environment;
(4) Adding 4.5-10.2 parts of emulsifier and 0.3-1.1 parts of emulsion stabilizer into deionized water, stirring at a constant temperature of 60 ℃ for 20min, and adding NaOH to adjust the pH value of the soap solution to 12 in a stirring process to prepare the soap solution;
(5) Heating the prepared mixture 2 to 160 ℃, mixing the mixture 2 and the soap solution according to the proportion of 6-5.5:4-4.5 under the condition of the soap solution of 60 ℃, adding the mixture into a colloid mill or a high-speed cutting machine, and shearing and dispersing for 5-10 min at 300-400 r/min to form a brown mixture with uniform texture, thereby preparing the desulfurization activated rubber asphalt; s3: preparing a modified rubber reclaimed asphalt mixture:
(1) Mixing the asphalt mixed reclaimed material with the desulfurization activated rubber asphalt and the smoke suppression viscosity reducer at 140-150 ℃ for preheating, mixing the asphalt mixed reclaimed material with coarse and fine aggregates, adding the coarse and fine aggregates into a stirrer, and heating and stirring for 10min at 170-180 ℃;
(2) Adding warm mixing agent and external admixture, mixing and stirring for 20min to obtain the modified rubber reclaimed asphalt mixture.
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| CN101168600A (en) * | 2007-09-20 | 2008-04-30 | 南京工业大学 | High shear stress induced desulfurization and modification method for waste tire rubber |
| CN108727843A (en) * | 2018-06-04 | 2018-11-02 | 长安大学 | A kind of composite modified devulcanized rubber pitch and preparation method thereof |
| CN111909529A (en) * | 2020-06-10 | 2020-11-10 | 北京克林泰尔环保科技有限公司 | Desulfurized waste tire rubber powder crosslinked modified asphalt and preparation method thereof |
| CN112430010A (en) * | 2020-11-26 | 2021-03-02 | 东南大学 | Desulfurized reclaimed rubber reclaimed asphalt mixture and preparation method thereof |
| CN115140965A (en) * | 2022-07-27 | 2022-10-04 | 广西交科集团有限公司 | Heat treatment/8501 desulfurization activated rubber powder/SBS composite modified asphalt and preparation method and application thereof |
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