CN112852176B - High-modulus asphalt and preparation method thereof - Google Patents
High-modulus asphalt and preparation method thereof Download PDFInfo
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- CN112852176B CN112852176B CN202110367666.0A CN202110367666A CN112852176B CN 112852176 B CN112852176 B CN 112852176B CN 202110367666 A CN202110367666 A CN 202110367666A CN 112852176 B CN112852176 B CN 112852176B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 115
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000003607 modifier Substances 0.000 claims abstract description 21
- 239000003381 stabilizer Substances 0.000 claims abstract description 20
- 229920000642 polymer Polymers 0.000 claims abstract description 15
- 239000012629 purifying agent Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000035515 penetration Effects 0.000 claims abstract description 12
- 239000011159 matrix material Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000010008 shearing Methods 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 claims description 12
- 238000011161 development Methods 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 2
- 239000002516 radical scavenger Substances 0.000 claims 3
- 239000002994 raw material Substances 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 8
- 239000002699 waste material Substances 0.000 abstract description 5
- 229920001971 elastomer Polymers 0.000 abstract description 4
- 239000000843 powder Substances 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 6
- 239000010779 crude oil Substances 0.000 description 6
- 238000009835 boiling Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000012459 cleaning agent Substances 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000796 flavoring agent Substances 0.000 description 2
- 235000019634 flavors Nutrition 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006757 chemical reactions by type Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Working-Up Tar And Pitch (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides high modulus asphalt, which comprises the following components: low-grade base asphalt: 100 parts by weight; polymer modifier: 4.0 to 5.5 parts by weight; flavor-purifying agent: 0.01 to 0.1 part by weight; a stabilizer: 0.2 to 0.3 part by weight; the low-grade matrix asphalt has a penetration of 37-43 dmm and a softening point of over 51 ℃. On one hand, the invention directly adopts low-grade asphalt as a raw material, and avoids the process of blending high-grade asphalt by using hard asphalt; on the other hand, the low-grade asphalt is used as a raw material, and the specific modifier is added, so that the modulus of the material is improved, and the low-temperature performance of the material is also improved; in addition, the raw materials used in the invention are simple, raw materials with unpleasant odor at high temperature such as waste rubber powder are not needed, and the asphalt odor purifying agent is added in the preparation process, so that the high-modulus asphalt is more environment-friendly and easier to popularize in the use process.
Description
Technical Field
The invention relates to the technical field of high-modulus asphalt, in particular to high-modulus asphalt and a preparation method thereof.
Background
The mode of combining the semi-rigid base layer and the surface layer is most commonly used in the design of expressways in China, the combined mode has certain tensile strength, fatigue resistance and good water stability, and is widely used, but in the actual use process, the defects of the semi-rigid base layer gradually appear, for example, temperature shrinkage drying shrinkage cracks easily appear, the bonding property with an asphalt surface layer is weak, and the like, so that the service life of the Chinese semi-rigid asphalt pavement can not meet the design requirements and standards generally. The expressway with the vehicle passing through rarely reaches the 15-year service life specified in the design specifications, most of the expressway needs to be maintained on a large scale after being built and used for 5-8 years, the repair cost is high, and the expressway has great influence on the traffic, agriculture and economic development.
In addition, with the development of economic society of China, the construction demand of special roads under severe load conditions, such as long and large longitudinal slope highways, large-capacity urban rapid transit trunks, special lanes for ports and harbor areas, heavy-duty bridge deck pavement, airport runways and the like, is increased, the construction requirements of the projects cannot be met by adopting common asphalt cement and mixture, the rutting diseases of the road surface are easy to appear, and the rutting diseases become the most serious early failure mode of the asphalt road surface according to statistics.
The long-life asphalt road is also called as durable asphalt pavement, is a thickened or full-thickness asphalt road system originated in Europe and America in the last century, and has a design service life of more than 40 years. The long-life asphalt pavement has the advantages that damage is limited to the upper layer of the pavement, and the pavement surface layer is only required to be replaced regularly without structural repair or reconstruction. Besides, the long-life asphalt pavement has the advantages of being smooth in pavement, high in friction coefficient, low in noise, capable of reducing fatigue cracking and track damage, reducing building cost by thinning the pavement, limiting pavement maintenance to the surface layer and being capable of being recycled, reducing resource waste to the maximum extent, and being high in economical efficiency.
The long-life asphalt road needs to use a high-modulus asphalt mixture, and the high-modulus asphalt mixture is a pavement material with higher overall modulus and excellent anti-rutting and fatigue resistance performances. The asphalt layer structure thickness can be thinner under the same accumulative axial effect by improving the modulus parameter of the asphalt mixture, the bearing capacity and the service life can still meet the design requirement and even be higher, a large amount of stones can be saved, and the method has great significance to areas lacking of high-quality stones. The high modulus asphalt mainly aims to improve modulus parameters in structural calculation, reduce the thickness of the asphalt layer, meet structural calculation requirements and reduce engineering cost.
The core of the high modulus asphalt mixture is high modulus asphalt. The high-modulus asphalt is asphalt capable of remarkably improving the stiffness modulus and the fatigue resistance of the asphalt mixture. The high-modulus asphalt is generally realized through three channels, firstly, the hard asphalt is adopted, and although the high-temperature vehicle-load resistance of the hard asphalt mixture is effectively verified, the low-temperature property of the hard asphalt mixture is poor; secondly, natural asphalt is added, so that the high-temperature anti-rutting capacity, the bearing capacity and the durability of the asphalt mixture can be improved, but the natural asphalt has limited reserves and also has poor low-temperature performance; thirdly, the high modulus asphalt is prepared by adding the modifier into the asphalt, and the low temperature performance of the material is not greatly lost while the overall modulus and the high temperature performance of the material are improved by selecting a proper modifier and a proper modification process.
Polyolefin and waste rubber powder raw materials are frequently used in the preparation of the existing high-modulus asphalt, the waste rubber powder easily volatilizes unpleasant smell in the production and use processes of the high-modulus asphalt and is not beneficial to environmental protection, and polyolefin materials such as PP, PE and resins obviously improve the modulus of the asphalt and have very adverse effects on the low-temperature performance of the asphalt.
Disclosure of Invention
In view of the above, the present invention provides a high modulus asphalt and a preparation method thereof, wherein the prepared high modulus asphalt has both high modulus and excellent low temperature performance.
In order to achieve the above object, the present invention provides a high modulus asphalt comprising:
low-grade base asphalt: 100 parts by weight; polymer modifier: 4.0 to 5.5 parts by weight; flavor-purifying agent: 0.01 to 0.1 part by weight; a stabilizer: 0.2 to 0.3 part by weight;
the low-grade matrix asphalt has a penetration of 37-43 dmm and a softening point of over 51 ℃.
According to the invention, the softening point of the low-grade matrix asphalt is preferably 51-55 ℃.
Preferably, the low-grade base asphalt is straight-run low-grade asphalt, and more preferably straight-run No. 30 asphalt.
In some embodiments of the invention, the low-grade base bitumen is a low-grade bitumen cut by a true boiling point distillation, and the cut feedstock may be, but is not limited to, one or more of heavy crude oils of the middle east, canada, and the like.
In some embodiments of the invention, the low-grade base asphalt has a penetration of 37dmm and a softening point of 53.5 ℃.
In some embodiments of the invention, the low-grade base asphalt has a penetration of 40dmm and a softening point of 52.5 ℃.
In some embodiments of the invention, the low-grade base asphalt has a penetration of 43dmm and a softening point of 51.5 ℃.
The invention directly adopts the straight-run No. 30 asphalt as the raw material, the process of hard component blending is omitted, the production process is more convenient, and the viscosity is not too high by adopting the high-modulus asphalt obtained by the straight-run low-grade asphalt, thereby being beneficial to production pumping and construction workability.
Preferably, the polymer modifier is a styrene-butadiene-styrene block copolymer.
In the present invention, the molecular weight of the styrene-butadiene-styrene block copolymer is not less than 10 ten thousand, more preferably 10 to 20 ten thousand; the block ratio is preferably 3:7 to 4:6, more preferably 3: 7.
In some embodiments of the invention, the polymer modifier is specifically SBS 791.
According to the invention, the low-grade asphalt is modified by adding the polymer modifier, so that the modulus of the low-grade asphalt is improved, and the low-temperature performance of the low-grade asphalt is also improved.
Preferably, the odor purifying agent is a Tianjin Haitai EO reaction type environment-friendly asphalt odor purifying agent, a high-efficiency odor purifying agent for Zhonghai cis-da road modified asphalt or a Guangzhou hongmian CW500 odor purifying agent.
The invention adds the odor purifying agent, and has certain environmental protection significance for the construction of high modulus asphalt. Compared with the conventional polymer modified asphalt, the high-modulus asphalt has higher viscosity and higher construction temperature, is more likely to cause volatilization of harmful substances, and can promote environmental protection application and popularization of the high-modulus asphalt by adding the reactive odor purifying agent.
In the invention, the stabilizer is preferably Dombe stabilizer HMD-2 and Shandong middle protective stabilizer ZQ-WDJ.
The invention provides a preparation method of the high modulus asphalt, which comprises the following steps:
s1) mixing the low-grade matrix asphalt with the polymer modifier, and shearing at high temperature to obtain an intermediate material;
s2) mixing the intermediate material, the stabilizer and the smell purifying agent, and stirring to obtain a mixture;
s3) standing, developing and defoaming the mixture to obtain the high-modulus asphalt.
Preferably, the high-temperature shearing temperature is 180 ℃, the shearing rate is 4500r/min, and the shearing time is 0.5 h.
Preferably, the stirring temperature is 177 ℃, the stirring speed is 800r/min, and the stirring time is 1.0 h.
Preferably, the temperature for standing development and defoaming is 175-185 ℃, and more preferably 177 ℃; the time for defoaming is preferably 20-40 min.
The high-modulus asphalt provided by the invention is simple and easy to obtain, and has a wide application prospect in long-life asphalt pavements.
Compared with the prior art, the invention provides high modulus asphalt, which comprises the following components: low-grade base asphalt: 100 parts by weight; polymer modifier: 4.0 to 5.5 parts by weight; flavor-purifying agent: 0.01 to 0.1 part by weight; a stabilizer: 0.2 to 0.3 part by weight; the low-grade matrix asphalt has a penetration of 37-43 dmm and a softening point of over 51 ℃.
The invention obtains the following beneficial effects:
1. the raw materials of the invention are simple in variety, uncomplicated, convenient for industrial application, free from the use of raw materials with unpleasant smell at high temperature such as waste rubber powder, and the odor-free component is added in the formula, thus being beneficial to the control of harmful gas release in the high-temperature construction process, more environment-friendly and easy to popularize;
2. the low-grade asphalt obtained by the blending method is more reasonable, and the components are matched without adopting a straight-run process, so that the modifier is more stable in the low-grade asphalt and is not easy to segregate;
3. the invention uses low-grade asphalt as a raw material, improves the modulus of the material by adding a specific modifier, improves the low-temperature performance of the material and is beneficial to the long-term use of the asphalt pavement.
4. The polymer modifier has low addition amount and certain advantage in the aspect of saving cost.
Detailed Description
In order to further illustrate the present invention, the high modulus asphalt and the preparation method thereof provided by the present invention are described in detail below with reference to examples.
Example 1
No. 40 low-grade asphalt (penetration degree 37dmm, softening point 53.5 ℃) which is obtained by cutting two crude oils in the middle east by adopting a real boiling point, and 500 parts of the raw materials; 22.5 parts of polymer modifier 791 SBS; the Boyue stabilizer is 1 part; 0.015 part of Guangzhou hongmian flavor cleaning agent.
The preparation method comprises the following steps: adding an SBS modifier into matrix asphalt, heating to 180 ℃, shearing for 0.5h at a shearing rate of 4500r/min by using a shearing machine, transferring to a constant-temperature heating sleeve after shearing is finished, adding a stabilizer, keeping the temperature at 177 ℃, stirring for 1.0h at a rotating speed of 800r/min, transferring to a drying oven at the same temperature, standing, developing/defoaming for 20min, and then preparing a sample.
Example 2
Low grade No. 40 bitumen (penetration 40dmm, softening point 52.5 ℃) obtained by cutting crude oils from both middle east and canada using a true boiling point, 500 parts of this material; 23 parts of polymer modified asphalt 791 SBS; 1.1 parts of medium-full protection stabilizer; 0.005 part of Tianjin Haitai flavor remover.
The preparation method comprises the following steps: adding an SBS modifier into matrix asphalt, heating to 180 ℃, shearing for 0.5h at a shearing rate of 4500r/min by using a shearing machine, transferring to a constant-temperature heating sleeve after shearing is finished, adding a stabilizer, keeping the temperature at 177 ℃, stirring for 1.0h at a rotating speed of 800r/min, transferring to an oven at the same temperature, standing for development/defoaming for 20min, and preparing a sample.
Example 3
No. 40 low-grade asphalt (penetration degree 43dmm, softening point 51.5 ℃) is obtained by cutting crude oil of a middle east by a real boiling point, and 500 parts of the raw material is obtained; 24.5 parts of polymer modified asphalt 791 SBS; 1.2 parts of Boyue stabilizer; 0.01 part of Zhonghai cis-da smell cleaning agent. The preparation method comprises the following steps: adding an SBS modifier into matrix asphalt, heating to 180 ℃, shearing for 0.5h at a shearing rate of 4500r/min by using a shearing machine, transferring to a constant-temperature heating sleeve after shearing is finished, adding a stabilizer, keeping the temperature at 177 ℃, stirring for 1.0h at a rotating speed of 800r/min, transferring to an oven at the same temperature, standing for development/defoaming for 20min, and preparing a sample.
Comparative example 1
No. 30 low-grade asphalt is obtained by distillation cutting with a real boiling point, the raw materials are two kinds of crude oil in the middle east, the penetration degree of a sample obtained by cutting is 34dmm, and the softening point is 54.8 ℃. Heating the asphalt to 140 ℃, and preparing a sample after uniformly stirring.
Comparative example 2
No. 70 asphalt (penetration degree of 61dmm, softening point of 48.5 ℃)500 parts, Luoyang petrochemical deoiled asphalt 45 parts, Manteck extender 5 parts, 791SBS25 parts and Boyue stabilizer 1.25 parts are produced by adopting Marie crude oil, and the preparation method comprises the following steps: adding deoiled asphalt into asphalt, stirring for 30min at the temperature of 160 ℃ and 400r/min, then adding an SBS modifier and a ductility enhancer into the mixed asphalt, heating to 180 ℃, shearing for 0.5h at the shearing rate of 4500r/min by using a shearing machine, transferring to a constant-temperature heating sleeve after shearing is finished, adding a stabilizer, keeping the temperature at 177 ℃, stirring for 1.0h at the rotating speed of 800r/min, transferring to a drying oven with the same temperature, standing for development/defoaming for 20min, and then preparing a sample.
And (3) performance detection:
the samples prepared in the examples 1-3 and the comparative examples 1-2 are stirred at 170 ℃, a smoke analyzer is adopted to monitor harmful components in smoke, and the real-time data of 25min after the start of the test is taken as a collection point. The results of the experiment are shown in table 1:
TABLE 1 asphalt product Performance test results
The results in table 1 show that the PG grade of the high-modulus asphalt prepared by the invention is better than that of the comparative example, the modulus of the mixture prepared by the invention as the raw material also meets the requirement (complex modulus (15 ℃, 10Hz) ≥ 14000MPa), and compared with the high-modulus asphalt prepared by the low-grade asphalt obtained by a blending method with the addition of hard components, the viscosity value at 135 ℃ prepared by the invention is smaller than that of the comparative example 2, so that the workability of production and construction is more excellent, and in addition, the harmful components in smoke are obviously reduced in the high-modulus asphalt after the addition of the odor purifying agent, which is beneficial to environmental protection.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. A high modulus asphalt, consisting of the following components:
low-grade base asphalt: 100 parts by weight; polymer modifier: 4.0 to 5.5 parts by weight; flavor-purifying agent: 0.01 to 0.1 part by weight; a stabilizer: 0.2 to 0.3 part by weight;
the penetration degree of the low-grade matrix asphalt is 37-43 dmm, and the softening point is 51-55 ℃;
the polymer modifier is a styrene-butadiene-styrene block copolymer, and the molecular weight of the styrene-butadiene-styrene block copolymer is not less than 10 ten thousand; the block ratio is 3:7-4: 6;
the stabilizer is Doying Boyue stabilizer HMD-2 and Shandong middle protective stabilizer ZQ-WDJ.
2. The high modulus asphalt of claim 1, wherein said odor scavenger is a Tianjin Haitai EO reactive asphalt environmental friendly odor scavenger or a Zhonghai cis da road modified asphalt high efficiency odor scavenger.
3. The process for preparing a high modulus asphalt of any one of claims 1 to 2, comprising the steps of:
s1) mixing the low-grade matrix asphalt and the polymer modifier, and shearing at high temperature to obtain an intermediate material;
s2) mixing the intermediate material, the stabilizer and the smell purifying agent, and stirring to obtain a mixture;
s3) standing, developing and defoaming the mixture to obtain the high-modulus asphalt.
4. The method according to claim 3, wherein the high temperature shearing temperature is 180 ℃, the shearing rate is 4500r/min, and the shearing time is 0.5 h.
5. The preparation method according to claim 3, wherein the stirring temperature is 177 ℃, the stirring speed is 800r/min, and the stirring time is 1.0 h.
6. The preparation method according to claim 3, wherein the temperature for standing development and defoaming is 175-185 ℃, and the time is 20-40 min.
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| CN116855093A (en) * | 2023-07-11 | 2023-10-10 | 山东海韵沥青有限公司 | High modulus asphalt and its preparation method and application |
| CN117304701B (en) * | 2023-08-28 | 2024-07-16 | 山东海韵沥青有限公司 | Screening method of low-grade asphalt raw material for high-modulus asphalt and application thereof |
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| CN109651831A (en) * | 2018-12-29 | 2019-04-19 | 许昌腾飞建设工程集团有限公司 | A kind of economical pitch ordor removing reinforced modifier and its preparation method and application |
| CN111234547A (en) * | 2020-03-25 | 2020-06-05 | 江苏天诺环境工程技术开发有限公司 | Environment-friendly low-grade hard asphalt modification method |
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