CN110981285B - Processing technology of asphalt mixture for heavy-duty traffic pavement - Google Patents
Processing technology of asphalt mixture for heavy-duty traffic pavement Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 158
- 239000000203 mixture Substances 0.000 title claims abstract description 73
- 238000005516 engineering process Methods 0.000 title claims abstract description 14
- 238000012545 processing Methods 0.000 title claims abstract description 12
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 57
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 38
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 71
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 70
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 52
- 239000003381 stabilizer Substances 0.000 claims description 37
- 239000000945 filler Substances 0.000 claims description 35
- 239000004005 microsphere Substances 0.000 claims description 32
- 239000003795 chemical substances by application Substances 0.000 claims description 31
- 238000010008 shearing Methods 0.000 claims description 28
- 229920002379 silicone rubber Polymers 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 27
- 235000012239 silicon dioxide Nutrition 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 25
- 239000005543 nano-size silicon particle Substances 0.000 claims description 25
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 17
- 239000004743 Polypropylene Substances 0.000 claims description 16
- 239000011521 glass Substances 0.000 claims description 16
- 229920001155 polypropylene Polymers 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 16
- 238000005303 weighing Methods 0.000 claims description 14
- 238000001881 scanning electron acoustic microscopy Methods 0.000 claims description 13
- 239000003784 tall oil Substances 0.000 claims description 11
- 239000012615 aggregate Substances 0.000 claims description 10
- 238000007731 hot pressing Methods 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 235000019738 Limestone Nutrition 0.000 claims description 6
- 239000006028 limestone Substances 0.000 claims description 6
- 238000009849 vacuum degassing Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 12
- 229910052717 sulfur Inorganic materials 0.000 description 11
- 239000011593 sulfur Substances 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- XUIMIQQOPSSXEZ-NJFSPNSNSA-N silicon-30 atom Chemical group [30Si] XUIMIQQOPSSXEZ-NJFSPNSNSA-N 0.000 description 3
- 239000004945 silicone rubber Substances 0.000 description 3
- 239000002341 toxic gas Substances 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000011280 coal tar Substances 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 239000003981 vehicle Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a processing technology of an asphalt mixture for a heavy traffic road surface, which is characterized in that polytetrafluoroethylene fibers are generally used for modifying asphalt in the market at present, but the defects of poor wear resistance, low hardness, poor dimensional stability and the like of the polytetrafluoroethylene fibers greatly affect the wear resistance and mechanical properties of the asphalt mixture. The invention obtains proper proportion through multiple tests, has reasonable process, effectively improves the mechanical strength and wear resistance of the asphalt mixture, improves the compatibility between asphalt and each component, ensures that the asphalt mixture is more stable and has higher practicability.
Description
Technical Field
The invention relates to the technical field of asphalt preparation, in particular to an asphalt mixture for a heavy-duty traffic road surface and a processing technology thereof.
Background
Asphalt is a blackish brown complex mixture composed of hydrocarbon compounds with different molecular weights and nonmetallic derivatives thereof, is one of high-viscosity organic liquids, is in a liquid state, has a black surface and is soluble in carbon disulfide; asphalt is a waterproof, dampproof and anticorrosive organic cementing material.
Asphalt can be mainly divided into three types, including coal tar asphalt, petroleum asphalt and natural asphalt, wherein the coal tar asphalt is a byproduct of coking; petroleum asphalt is residue after crude oil distillation; natural asphalt is stored underground, and some are formed into mineral deposits or accumulated on the surface of the crust.
Asphalt is mainly used in industries such as paint, plastic, rubber and the like, paving road and the like, is an organic matter which is frequently seen in life, and along with the progress and development of science and technology, the research of asphalt is more and more in depth.
When asphalt is used for paving a road surface, the asphalt is crushed due to heavy-duty automobiles after being used for a period of time, cracks, ruts and the like are generated, the service life is short, road traffic is greatly influenced, potential safety hazards are brought to vehicles in the past, accidents are improved, the mechanical strength and wear resistance of the road surface are improved, polytetrafluoroethylene fibers are generally added for modification in the preparation of the asphalt mixture at present, the wear resistance of the asphalt mixture is greatly reduced, and inconvenience is brought to people.
In view of the above problems, we provide an asphalt mixture for heavy traffic pavement and a processing technology thereof, which not only needs to improve the mechanical properties of asphalt, but also needs to know the abrasion resistance of the asphalt mixture, which is one of the problems to be solved in our urgent need.
Disclosure of Invention
The invention aims to provide an asphalt mixture for a heavy-duty traffic road surface and a processing technology thereof, so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an asphalt mixture for a heavy-duty traffic road surface comprises the following raw material components: the asphalt comprises, by weight, 880-910 parts of aggregate, 100-120 parts of asphalt, 5-25 parts of stabilizer, 70-120 parts of compatilizer, 6-12 parts of filler, 15-25 parts of polytetrafluoroethylene fiber, 10-30 parts of nano silicon dioxide and 30-50 parts of wear-resistant agent.
In an optimized scheme, the asphalt mixture comprises the following raw materials in parts by weight: the asphalt comprises, by weight, 880-910 parts of aggregate, 100-120 parts of asphalt, 5-20 parts of stabilizer, 70-100 parts of compatilizer, 6-12 parts of filler, 15-25 parts of polytetrafluoroethylene fiber, 10-25 parts of nano silicon dioxide and 30-40 parts of wear-resistant agent.
In an optimized scheme, the wear-resistant agent comprises the following raw materials in parts by weight: 50-85 parts of calcium sulfate whisker, 150-175 parts of silicon rubber and 5-8 parts of tetraethoxysilane.
In an optimized scheme, the filler mainly comprises hollow glass microspheres and hollow polypropylene microspheres, and the particle sizes of the hollow glass microspheres and the hollow polypropylene microspheres are 0.1-0.5 mu m.
The optimized scheme is that the asphalt is one of matrix asphalt and SBS modified asphalt; the aggregate is one or more of basalt and limestone.
More optimally, the compatilizer is tall oil; the stabilizer is one of sulfur or SEAM.
In the invention, the compatilizer is tall oil, so that the compatibility among all the components can be effectively improved, the mixing effect is better, and the mechanical property of the prepared asphalt mixture is improved.
More preferably, the stabilizer is SEAM.
The preferred scheme of the stabilizer is SEAM, and the SEAM is added into asphalt, so that side effects of releasing toxic gases and the like by sulfur can be reduced, meanwhile, the high-temperature stability of the asphalt mixture is improved, the rutting resistance of the asphalt mixture is enhanced, and the asphalt mixture is environment-friendly and practical.
The optimized scheme is that the processing technology of the asphalt mixture for the heavy-duty traffic pavement comprises the following steps:
1) Preparing materials;
2) Sintering nano silicon dioxide and polytetrafluoroethylene fiber in a hot-pressing manner to obtain a material A;
3) Preparing an antiwear agent;
4) Heating asphalt, adding the material A prepared in the step 2) and the wear-resistant agent, aggregate and filler prepared in the step 3), and shearing and stirring; continuously adding a stabilizer, and continuously shearing and stirring; and adding a compatilizer, and continuously stirring at room temperature to obtain the asphalt mixture.
The more optimized scheme comprises the following steps:
1) Weighing aggregate, asphalt, stabilizer, compatilizer, filler, polytetrafluoroethylene fiber and nano silicon dioxide according to a proportion for standby;
2) Taking nano silicon dioxide and polytetrafluoroethylene fibers in the step 1), and performing hot-pressing sintering to prepare a material A;
3) Weighing calcium sulfate whisker, silicon rubber and ethyl orthosilicate according to a proportion, and preparing an antiwear agent for later use;
4) Heating asphalt, starting a stirring shearing machine, adding the material A prepared in the step 2) and the wear-resistant agent, aggregate and filler prepared in the step 3), and shearing and stirring; continuously adding a stabilizer, and continuously shearing and stirring; adding the compatilizer, continuing stirring at room temperature until the temperature is reduced to 110-120 ℃, and stopping stirring to obtain the asphalt mixture.
The more optimized scheme comprises the following steps:
1) Weighing aggregate, asphalt, stabilizer, compatilizer, filler, polytetrafluoroethylene fiber and nano silicon dioxide according to a proportion for standby;
2) Taking nano silicon dioxide and polytetrafluoroethylene fibers in the step 1), crushing, putting into a stirrer for stirring, heating to 315-330 ℃ after stirring uniformly, and preserving heat for 3-5h; heating again, heating to 370-380 ℃, and preserving heat for 2-4h; hot-pressing and sintering under 255-265MPa to prepare a material A; in the step 2), the nano silicon dioxide is used for modifying the polytetrafluoroethylene fiber, so that the creep resistance and the wear resistance of the polytetrafluoroethylene are improved;
3) Weighing calcium sulfate whisker, silicon rubber and ethyl orthosilicate according to a proportion, putting the silicon rubber into a stirring kettle, adding the calcium sulfate whisker, and stirring for 10-25min at room temperature; adding ethyl orthosilicate, stirring uniformly, vacuum degassing at room temperature, and standing for 24 hours to obtain an antiwear agent; in the step 3), the invention uses calcium sulfate whisker and silicon rubber to mix, uses calcium sulfate whisker to reinforce the silicon rubber, and prepares the composite material of the silicon rubber and the calcium sulfate whisker;
4) Heating asphalt to 180-195 ℃, starting a stirring shearing machine, adding the material A prepared in the step 2) and the wear-resistant agent, aggregate and filler prepared in the step 3), and shearing and stirring for 20-30min; continuously adding a stabilizer, continuously shearing and stirring for 1-1.5h, and controlling the temperature to be 170-180 ℃; adding the compatilizer, continuing stirring at room temperature until the temperature is reduced to 110-120 ℃, and stopping stirring to obtain the asphalt mixture. In the step 4), the materials prepared in the step 2) and the step 3) are mixed with asphalt, filler, compatilizer and the like, and the asphalt mixture is prepared through operations such as mixing and shearing, so that the asphalt mixture has better compressive strength and wear resistance.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an asphalt mixture for a heavy-duty traffic road surface and a processing technology thereof, wherein the asphalt mixture comprises aggregate, filler, asphalt and the like.
At present, polytetrafluoroethylene fibers are generally used for modifying asphalt in the market, the polytetrafluoroethylene fibers are a very high-temperature-resistant material, the low-temperature flexibility is very good, the polytetrafluoroethylene fibers are added into the asphalt to play a role in crosslinking, the structural strength and the cohesiveness of the asphalt mixture are effectively improved, and meanwhile, the high-temperature resistance and the low-temperature resistance of the asphalt mixture are also obviously improved; however, the polytetrafluoroethylene fiber has the defects of poor wear resistance, low hardness, poor dimensional stability and the like, greatly influences the wear resistance and mechanical properties of the asphalt mixture, and aiming at the problem, nano silicon dioxide is added into asphalt, the nano silicon dioxide is filled into the polytetrafluoroethylene fiber, so that the heat conducting property of the polytetrafluoroethylene fiber is properly improved, the creep resistance of the polytetrafluoroethylene fiber is improved, the asphalt mixture is prevented from generating large-area belt-shaped abrasive dust in the friction process, the wear resistance of the asphalt mixture is improved, and the influence caused by the polytetrafluoroethylene fiber is reduced.
Meanwhile, an antiwear agent is added into asphalt, and the antiwear agent consists of calcium sulfate whisker and silicon rubber.
The calcium sulfate whisker is a calcium sulfate fibrous single crystal synthesized by taking gypsum as a raw material through a specific process and formula, and has a plurality of excellent physicochemical properties such as high strength, high modulus, high toughness, high insulativity, wear resistance, high temperature resistance, acid and alkali resistance, corrosion resistance, good infrared reflectivity, easy surface treatment, easy compounding with polymers, no toxicity and the like; the material has uniform cross section, complete appearance and highly perfect internal structure, and is a nonmetallic material with a plurality of special properties; the calcium sulfate whisker is added into the asphalt, so that the shear strength and the tensile strength of the asphalt mixture can be effectively improved, and meanwhile, the stability and the wear resistance of the asphalt mixture are also improved.
In the process of preparing the antiwear agent, the silicon rubber is modified by the calcium sulfate whisker to prepare the composite material, so that various physical properties of the asphalt mixture can be effectively improved; meanwhile, the silicone rubber is added into the asphalt to generate synergistic effect with polytetrafluoroethylene fibers, so that the performances of abrasion resistance, high temperature resistance and the like of the asphalt mixture are further improved, and the mechanical strength is also further improved.
The invention provides an asphalt mixture for a heavy traffic road surface and a processing technology thereof, wherein a stabilizer is added, the stabilizer is selected as sulfur or SEAM, the sulfur has better compatibility with asphalt and better cohesiveness with aggregate, and in the mixing process, the sulfur can be uniformly distributed in the asphalt in the form of very fine particles so as to improve the mechanical property of the asphalt mixture; however, in practical use, more H is generated by adding sulfur into asphalt 2 S、CS 2 Toxic gases such as COS and the like cause larger environmental pollution and have certain influence on human bodies, so in the technology of the invention, the more preferable scheme is to add SEAM.
The SEAM is a vulcanized asphalt modifier, and a smoke inhibitor and a plasticizer are added into sulfur, so that the smoke inhibitor can ensure that gases such as hydrogen sulfide, sulfur dioxide and the like are not generated in the preparation process below 150 ℃, the concentration of sulfur vapor is low, and side effects caused by sulfur are reduced; the plasticizer can improve the quality of sulfur and the strength of asphalt, and improve the mechanical strength and mechanical property of the asphalt mixture; according to the invention, by adding SEAM into asphalt, side effects such as toxic gas release by sulfur can be reduced, meanwhile, the high-temperature stability of the asphalt mixture is improved, the rutting resistance of the asphalt mixture is enhanced, and the asphalt mixture is environment-friendly and practical.
According to the invention, tall oil is selected as the compatilizer, so that the compatibility among all components can be effectively improved, the mixing effect is better, and the mechanical properties of the prepared asphalt mixture are improved.
In the invention, the calcium sulfate whisker can also realize synergistic effect with tall oil, after the calcium sulfate whisker and the tall oil are uniformly mixed, the compatibility of the calcium sulfate whisker and asphalt is enhanced, the damage of the calcium sulfate whisker under the action of high temperature and mechanical force can be reduced, the structural integrity of the calcium sulfate whisker is preserved to the maximum extent, and the characteristics of high modulus and high strength of the calcium sulfate whisker are fully exerted.
According to the invention, the filler is selected from hollow glass microspheres and hollow polypropylene microspheres, and the hollow glass microspheres and the hollow polypropylene microspheres are reasonably matched, so that the wear resistance and mechanical strength of the asphalt mixture are optimal, and the service life and wear resistance of the asphalt pavement are effectively improved.
The SBS modified asphalt is used as a raw material, a certain proportion of SBS modifier is added, SBS is uniformly dispersed in the asphalt by shearing, stirring and other methods, and a certain proportion of special stabilizer is added to form an SBS blending material.
During processing, firstly, the polytetrafluoroethylene fiber is modified by silicon dioxide, so that the creep resistance of the polytetrafluoroethylene fiber is improved; and then the silicon rubber and the calcium sulfate whisker are mixed to prepare a composite material of the silicon rubber and the calcium sulfate whisker, so that the mechanical property of the silicon rubber is further improved, and the composite material is mixed with materials such as asphalt and sheared to prepare an asphalt mixture, wherein the prepared asphalt mixture has better compressive strength, tensile strength and wear resistance, and the high temperature resistance is also improved.
The asphalt mixture for the heavy-duty traffic road surface and the processing technology thereof provided by the invention have the advantages that the proper proportion is obtained through multiple tests, the technology is reasonable, the mechanical strength and the wear resistance of the asphalt mixture are effectively improved, the compatibility between asphalt and each component is also improved, and the asphalt mixture is more stable and has higher practicability.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
firstly, weighing aggregate, asphalt, a stabilizer, a compatilizer, a filler, polytetrafluoroethylene fibers and nano silicon dioxide according to a proportion for standby; then taking nano silicon dioxide and polytetrafluoroethylene fibers, crushing, putting into a stirrer for stirring, heating to 315 ℃ after stirring uniformly, and preserving heat for 3 hours; heating again, heating to 370 ℃, and preserving heat for 2h; hot-pressing and sintering under 255MPa pressure to prepare a material A; then weighing the calcium sulfate whisker, the silicon rubber and the ethyl orthosilicate according to the proportion, putting the silicon rubber into a stirring kettle, adding the calcium sulfate whisker, and stirring for 10min at room temperature; adding ethyl orthosilicate, stirring uniformly, vacuum degassing at room temperature, and standing for 24 hours to obtain an antiwear agent; heating asphalt to 180 ℃, starting a stirring shearing machine, adding the prepared material A, the prepared wear-resistant agent, the aggregate and the filler, and shearing and stirring for 20min; continuously adding a stabilizer, continuously shearing and stirring for 1h, and controlling the temperature to be 170 ℃; adding the compatilizer, continuing stirring at room temperature until the temperature is reduced to 110 ℃, and stopping stirring to obtain the asphalt mixture.
In this embodiment, the asphalt mixture comprises the following raw materials: the asphalt comprises, by weight, 880 parts of aggregate, 100 parts of asphalt, 5 parts of a stabilizer, 70 parts of a compatilizer, 6 parts of a filler, 15 parts of polytetrafluoroethylene fibers, 10 parts of nano silicon dioxide and 30 parts of an antiwear agent.
The components of the raw materials of the wear-resistant agent are as follows: 50 parts of calcium sulfate whisker, 150 parts of silicon rubber and 5 parts of tetraethoxysilane by weight; the filler mainly comprises hollow glass microspheres and hollow polypropylene microspheres, wherein the particle size of the hollow glass microspheres and the hollow polypropylene microspheres is 0.1 mu m; asphalt is matrix asphalt; the compatilizer is tall oil; the stabilizer is sulfur; the aggregate is basalt.
Example 2:
firstly, weighing aggregate, asphalt, a stabilizer, a compatilizer, a filler, polytetrafluoroethylene fibers and nano silicon dioxide according to a proportion for standby; then taking nano silicon dioxide and polytetrafluoroethylene fibers, crushing, putting into a stirrer for stirring, heating to 325 ℃ after stirring uniformly, and preserving heat for 4 hours; heating again, heating to 375 ℃, and preserving heat for 3h; hot-pressing and sintering under 260MPa pressure to prepare a material A; then weighing the calcium sulfate whisker, the silicon rubber and the ethyl orthosilicate according to the proportion, putting the silicon rubber into a stirring kettle, adding the calcium sulfate whisker, and stirring for 20min at room temperature; adding ethyl orthosilicate, stirring uniformly, vacuum degassing at room temperature, and standing for 24 hours to obtain an antiwear agent; heating asphalt to 190 ℃, starting a stirring shearing machine, adding the prepared material A, the prepared wear-resistant agent, the aggregate and the filler, and shearing and stirring for 25min; continuously adding a stabilizer, continuously shearing and stirring for 1.3h, and controlling the temperature to be 175 ℃; adding the compatilizer, continuing stirring at room temperature until the temperature is reduced to 115 ℃, and stopping stirring to obtain the asphalt mixture.
In this embodiment, the asphalt mixture comprises the following raw materials: the asphalt comprises, by weight, 895 parts of aggregate, 110 parts of asphalt, 15 parts of stabilizer, 90 parts of compatilizer, 9 parts of filler, 20 parts of polytetrafluoroethylene fiber, 20 parts of nano silicon dioxide and 40 parts of wear-resistant agent.
The components of the raw materials of the wear-resistant agent are as follows: 70 parts of calcium sulfate whisker, 160 parts of silicon rubber and 6 parts of tetraethoxysilane by weight; the filler mainly comprises hollow glass microspheres and hollow polypropylene microspheres, wherein the particle size of the hollow glass microspheres and the hollow polypropylene microspheres is 0.3 mu m; the asphalt is SBS modified asphalt; the compatilizer is tall oil; the stabilizer is SEAM; aggregate is basalt and limestone.
Example 3:
firstly, weighing aggregate, asphalt, a stabilizer, a compatilizer, a filler, polytetrafluoroethylene fibers and nano silicon dioxide according to a proportion for standby; then taking nano silicon dioxide and polytetrafluoroethylene fibers, crushing, putting into a stirrer for stirring, heating to 330 ℃ after uniformly stirring, and preserving heat for 5 hours; heating again, heating to 380 ℃, and preserving heat for 4 hours; hot-pressing and sintering under 265MPa pressure to prepare a material A; then weighing the calcium sulfate whisker, the silicon rubber and the ethyl orthosilicate according to the proportion, putting the silicon rubber into a stirring kettle, adding the calcium sulfate whisker, and stirring for 25 minutes at room temperature; adding ethyl orthosilicate, stirring uniformly, vacuum degassing at room temperature, and standing for 24 hours to obtain an antiwear agent; heating asphalt to 195 ℃, starting a stirring shearing machine, adding the prepared material A, the prepared wear-resistant agent, the aggregate and the filler, and shearing and stirring for 30min; continuously adding a stabilizer, continuously shearing and stirring for 1.5h, and controlling the temperature to be 180 ℃; adding the compatilizer, continuing stirring at room temperature until the temperature is reduced to 120 ℃, and stopping stirring to obtain the asphalt mixture.
In this embodiment, the asphalt mixture comprises the following raw materials: the asphalt comprises, by weight, 910 parts of aggregate, 120 parts of asphalt, 25 parts of stabilizer, 120 parts of compatilizer, 12 parts of filler, 25 parts of polytetrafluoroethylene fiber, 30 parts of nano silicon dioxide and 50 parts of wear-resistant agent.
The components of the raw materials of the wear-resistant agent are as follows: 85 parts of calcium sulfate whisker, 175 parts of silicon rubber and 8 parts of tetraethoxysilane by weight; the filler mainly comprises hollow glass microspheres and hollow polypropylene microspheres, wherein the particle size of the hollow glass microspheres and the hollow polypropylene microspheres is 0.5 mu m; the asphalt is SBS modified asphalt; the compatilizer is tall oil; the stabilizer is SEAM; the aggregate is limestone.
Example 4:
firstly, weighing aggregate, asphalt, a stabilizer, a compatilizer and a filler according to a proportion for standby; heating asphalt to 195 ℃, starting a stirring shearing machine, adding aggregate and filler, and shearing and stirring for 30min; continuously adding a stabilizer, continuously shearing and stirring for 1.5h, and controlling the temperature to be 180 ℃; adding the compatilizer, continuing stirring at room temperature until the temperature is reduced to 120 ℃, and stopping stirring to obtain the asphalt mixture.
In this embodiment, the asphalt mixture comprises the following raw materials: by weight, 895 parts of aggregate, 110 parts of asphalt, 15 parts of stabilizer, 90 parts of compatilizer and 9 parts of filler.
The filler mainly comprises hollow glass microspheres and hollow polypropylene microspheres, wherein the particle size of the hollow glass microspheres and the hollow polypropylene microspheres is 0.3 mu m; the asphalt is SBS modified asphalt; the compatilizer is tall oil; the stabilizer is SEAM; aggregate is basalt or limestone.
Example 5:
firstly, weighing aggregate, asphalt, a stabilizer, a compatilizer, a filler, polytetrafluoroethylene fibers and nano silicon dioxide according to a proportion for standby; then taking nano silicon dioxide and polytetrafluoroethylene fibers, crushing, putting into a stirrer for stirring, heating to 330 ℃ after uniformly stirring, and preserving heat for 5 hours; heating again, heating to 380 ℃, and preserving heat for 4 hours; hot-pressing and sintering under 265MPa pressure to prepare a material A; heating asphalt to 195 ℃, starting a stirring shearing machine, adding the prepared material A, aggregate and filler, and shearing and stirring for 30min; continuously adding a stabilizer, continuously shearing and stirring for 1.5h, and controlling the temperature to be 180 ℃; adding the compatilizer, continuing stirring at room temperature until the temperature is reduced to 120 ℃, and stopping stirring to obtain the asphalt mixture.
In this embodiment, the asphalt mixture comprises the following raw materials: the asphalt comprises, by weight, 895 parts of aggregate, 110 parts of asphalt, 15 parts of stabilizer, 90 parts of compatilizer, 9 parts of filler, 20 parts of polytetrafluoroethylene fiber, 20 parts of nano silicon dioxide and 40 parts of wear-resistant agent.
The components of the raw materials of the wear-resistant agent are as follows: 70 parts of calcium sulfate whisker, 160 parts of silicon rubber and 6 parts of tetraethoxysilane by weight; the filler mainly comprises hollow glass microspheres and hollow polypropylene microspheres, wherein the particle size of the hollow glass microspheres and the hollow polypropylene microspheres is 0.3 mu m; the asphalt is SBS modified asphalt; the compatilizer is tall oil; the stabilizer is SEAM; aggregate is basalt or limestone.
Experiment 1:
in the embodiments 1-3, the technical scheme of the invention is adopted, and in the embodiment 4, the preparation process of the common asphalt mixture is adopted; no antiwear agent was added in example 5; examples 1-3 form control experiments and examples 1-3 form control experiments with examples 4 and 5, respectively.
Taking the asphalt mixtures prepared in examples 1-3 and example 4, performing 10000 times of rutting tests at 60 ℃ and 0.7MPa wheel load, respectively performing asphalt density experiments and Marshall experiments on the asphalt mixtures, and recording experimental data to obtain the following data:
as can be seen from the data in the table, the technical schemes of the invention are shown in the examples 1-3, and the examples 1-3 and the example 4 form a comparison experiment, the density, the saturation and the stability of the prepared examples 1-3 are improved, and the void ratio is reduced, which fully shows that the technical scheme of the invention effectively improves the compatibility among the components of the asphalt mixture, improves the stability of materials and improves the mechanical properties.
The detection data of the Marshall experiments in examples 1-3 are better than the data in example 4, which fully demonstrates that the asphalt mixture prepared by the invention has better mechanical properties and high water loss resistance.
Experiment 2: abrasion resistance test
The wear resistance of the asphalt mixture prepared in examples 1-5 was tested by using a small-sized indoor accelerated loading test apparatus, and the loss rate of mass per unit area of the rut board was measured by simulating the wear of the rut board by vehicle tires to characterize the wear resistance of the asphalt mixture.
As can be seen from the data in the table, examples 1-3, example 4 and example 5 form comparison experiments, the unit mass loss rate of the common asphalt in example 5 is the highest, and secondly, the asphalt mixture prepared in example 4 is not added with silicone rubber and calcium sulfate whisker, while the unit mass loss rate of the asphalt mixture prepared in examples 1-3 is smaller, which fully shows that the silicone rubber and the calcium sulfate whisker can effectively improve the wear resistance of the asphalt mixture, prolong the service life of the asphalt mixture, and have higher practicability.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (1)
1. A processing technology of an asphalt mixture for a heavy-duty traffic road surface is characterized by comprising the following steps of: the method comprises the following steps:
1) Weighing aggregate, asphalt, stabilizer, compatilizer, filler, polytetrafluoroethylene fiber and nano silicon dioxide according to a proportion for standby; the asphalt mixture comprises the following raw materials in parts by weight: 895 parts of aggregate, 110 parts of asphalt, 15 parts of stabilizer, 90 parts of compatilizer, 9 parts of filler, 20 parts of polytetrafluoroethylene fiber, 20 parts of nano silicon dioxide and 40 parts of wear-resistant agent; the wear-resistant agent comprises the following raw materials in parts by weight: 70 parts of calcium sulfate whisker, 160 parts of silicon rubber and 6 parts of tetraethoxysilane by weight; the filler mainly comprises hollow glass microspheres and hollow polypropylene microspheres, and the particle size of the hollow glass microspheres and the hollow polypropylene microspheres is 0.3 mu m; the asphalt is SBS modified asphalt; the aggregate is basalt and limestone; the compatilizer is tall oil; the stabilizer is SEAM;
2) Taking nano silicon dioxide and polytetrafluoroethylene fibers in the step 1), crushing, putting into a stirrer for stirring, heating to 325 ℃ after stirring uniformly, and preserving heat for 4 hours; heating again, heating to 375 ℃, and preserving heat for 3h; hot-pressing and sintering under 260MPa pressure to prepare a material A;
3) Weighing calcium sulfate whisker, silicon rubber and ethyl orthosilicate according to a proportion, putting the silicon rubber into a stirring kettle, adding the calcium sulfate whisker, and stirring for 20min at room temperature; adding ethyl orthosilicate, stirring uniformly, vacuum degassing at room temperature, and standing for 24 hours to obtain an antiwear agent;
4) Heating asphalt to 190 ℃, starting a stirring shearing machine, adding the material A prepared in the step 2) and the wear-resistant agent, aggregate and filler prepared in the step 3), and shearing and stirring for 25min; continuously adding a stabilizer, continuously shearing and stirring for 1.3h, and controlling the temperature to be 175 ℃; adding the compatilizer, continuing stirring at room temperature until the temperature is reduced to 115 ℃, and stopping stirring to obtain the asphalt mixture.
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| CN112521054B (en) * | 2020-11-20 | 2022-07-19 | 山东圣德源道路工程有限公司 | Wear-resistant anti-skid ramp material and preparation method thereof |
| CN112551949A (en) * | 2020-12-25 | 2021-03-26 | 杭州浙飞机场工程有限公司 | Asphalt mixture for airport road construction and preparation method thereof |
| CN115057657B (en) * | 2022-06-30 | 2023-03-21 | 烟台市公路事业发展中心 | Ultrathin wearing layer paving method based on high-viscosity emulsified asphalt |
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