CN110204912B - Method for improving low-temperature crack resistance of Russian petroleum asphalt - Google Patents
Method for improving low-temperature crack resistance of Russian petroleum asphalt Download PDFInfo
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- 239000003208 petroleum Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 22
- 229920001971 elastomer Polymers 0.000 claims abstract description 52
- 238000000197 pyrolysis Methods 0.000 claims abstract description 49
- 239000003607 modifier Substances 0.000 claims abstract description 42
- 239000000203 mixture Substances 0.000 claims abstract description 33
- 229920000642 polymer Polymers 0.000 claims abstract description 29
- 238000010276 construction Methods 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 239000003381 stabilizer Substances 0.000 claims abstract description 7
- 238000010998 test method Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000084 colloidal system Substances 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 19
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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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
The invention discloses a method for improving low-temperature crack resistance of Russian petroleum asphalt, and belongs to the technical field of modified asphalt. The method comprises the steps of utilizing an SBS polymer modifier and an asphalt stabilizer to modify Russian petroleum asphalt to obtain SBS Russian modified asphalt; rubber pyrolysis oil is mixed into the SBS Russian modified asphalt, and the Russian modified asphalt is obtained through stirring. The method can effectively improve the quality of the Russian petroleum asphalt, so that the Russian petroleum asphalt is obviously improved in low-temperature cracking resistance, the low-temperature cracking resistance is superior to that of SBS polymer modified asphalt, and the problems that the Russian petroleum asphalt is easy to crack at low temperature, fatigue crack and resist permanent deformation are effectively solved. The hot mix asphalt concrete with SBS and rubber pyrolysis oil added into Russian asphalt is proved to be suitable for construction, overlay and repair operations of high-grade roads, municipal roads, rural roads, park pavements and the like.
Description
Technical Field
The invention relates to a method for improving low-temperature crack resistance of Russian petroleum asphalt, and belongs to the technical field of modified asphalt.
Background
The existing asphalt is divided into natural asphaltAnd modified asphalt, natural asphalt is residue of petroleum exudation surface after long-term exposure and evaporation, is a black 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 black surface and is soluble in carbon disulfide; the modified asphalt is asphalt obtained by adding the modifier, and has better performance compared with petroleum asphalt. The modified asphalt is one of important raw materials for paving traffic roads, the performance of the existing SBS polymer modified asphalt is undoubtedly applied in China, the modified asphalt is a modifier product integrating high-low temperature performance and temperature sensing performance, the SBS modified asphalt currently accounts for more than 60% of the global asphalt demand, and in recent years, the application of the SBS polymer modified asphalt in south and north China has the advantages of better durability of paved asphalt pavement, higher manufacturing cost and higher construction cost. Petroleum asphalt produced by Liaoning brocade is always adopted for highway construction at the edge of China at Heilongjiang, but with the mass exploitation of crude oil in China, the crude oil is rapidly reduced and seriously influences the ecological environment in China, russian and Heilongjiang are bordered, the Russian asphalt reserves are abundant and are supplied sufficiently, and the original total reserve of the Russian natural asphalt is 206 multiplied by 10 according to statistics 8 t, which is a potential source of petroleum asphalt. The quality requirement of matrix asphalt in JTG F40-2004 standard of Highway asphalt pavement construction technical Specification can be met by detecting the Russian petroleum asphalt performance. Because the Russian climate is similar to the Heilongjiang province climate, the Russian modified asphalt prepared from organic materials such as Russian petroleum asphalt, rubber pyrolysis oil, SBS polymer modifier and the like is very suitable for being used under low-temperature conditions, and the rubber pyrolysis oil and SBS polymer are doped to effectively reduce the occurrence of unavoidable temperature shrinkage cracks and fatigue shrinkage cracks of the Heilongjiang province caused by the climate, the temperature and the like. In summary, it is significant to develop a low cost, performance equivalent to or better than that of SBS polymer modified asphalt, and asphalt with better low temperature crack resistance to replace the high cost SBS modified asphalt.
Disclosure of Invention
In order to solve the problem that the product equivalent to SBS polymer modified asphalt is used for paving asphalt pavement, from the economic cost, russian asphalt has obvious price advantage compared with Liaoning brocade asphalt, the construction cost is reduced, the market supply way is increased, and the performance of the modified asphalt and asphalt mixture is the same as that of SBS polymer modified asphalt through verification. Although the wax content in Russian petroleum asphalt is higher than that of domestic matrix asphalt, the detection result meets the JTG F40-2004 standard requirement of the Highway asphalt pavement construction technical Specification in China, and the Russian modified asphalt processed by adding organic materials such as rubber pyrolysis oil, SBS polymer and the like when the Russian petroleum asphalt is used as an asphalt pavement paving raw material can improve the occurrence of disease problems such as temperature shrinkage cracks, fatigue shrinkage cracks and the like under the low-temperature condition. The invention provides a method for improving the cracking resistance of Russian petroleum asphalt, which adopts the following technical scheme:
the invention aims at providing a method for improving the low-temperature cracking resistance of Russian petroleum asphalt, which is characterized by comprising the following steps:
step one: modifying the Russian petroleum asphalt by using an SBS polymer modifier and an asphalt stabilizer to obtain SBS Russian modified asphalt;
step two: rubber pyrolysis oil is mixed into the SBS Russian modified asphalt, and the Russian modified asphalt is obtained through stirring.
Preferably, the SBS polymer modifier of step one is incorporated in an amount of 3% of the mass of the Russian petroleum asphalt.
Preferably, the blending amount of the rubber pyrolysis oil in the second step is 7-9% of the mass of the SBS Russian modified asphalt.
Preferably, the modification in step one is performed as follows: heating Russian petroleum asphalt to 130-140 ℃, premixing with SBS and asphalt stabilizer, shearing and grinding by using a colloid mill, continuously stirring and developing at 130-150 ℃, and periodically tracking and detecting according to a method specified in JTG E20-2011 'road asphalt and asphalt mixture test procedure', until the property index of the modified asphalt finished product meets the standard requirement specified in JTG F40-2004 'road asphalt pavement construction technical specification', thus obtaining the SBS Russian modified asphalt.
Preferably, in the second step, the stirring is to stir the rubber pyrolysis oil with the SBS Russian modified asphalt at 130-150 ℃.
The invention also provides the Russian modified asphalt prepared by the method for improving the low-temperature cracking resistance of the Russian petroleum asphalt.
In the method, the rubber pyrolysis oil can be added into the SBS Russian modified asphalt, and can also be added into a construction mixing station on site according to the requirements of a demand party and the climate characteristics.
The rubber pyrolysis oil is prepared from the waste tires and the high polymer elastomer produced by waste plastics, wherein the waste tires are ground into rubber powder of 60 mu m during the preparation, and then the rubber powder is refined at a high temperature of 300 ℃ to prepare the rubber pyrolysis oil, which is called as the rubber pyrolysis oil, the preparation process of the rubber pyrolysis oil is mature, and the rubber pyrolysis oil can be obtained through commercial purchase.
The SBS polymer modifiers and bitumen stabilizers used in the present invention are commercially available.
The invention has the beneficial effects that:
the Russian asphalt variety performance is equivalent to the Liaoning brocade No. 90 asphalt performance, the invention adopts a certain amount of SBS and rubber pyrolysis oil to modify the Russian petroleum asphalt, the modification effect is obvious, and the modified asphalt and asphalt concrete are equivalent to the SBS polymer modified asphalt in performance. According to the invention, rubber pyrolysis oil and SBS polymer modifier are added into Russian petroleum asphalt, so that the quality of the Russian petroleum asphalt can be effectively improved, the Russian petroleum asphalt is obviously improved in low-temperature cracking resistance, and the performance test is verified by adopting the method specified in the current national standard JTG E20-2011 Highway asphalt and asphalt mixture test procedure. The hot mix asphalt concrete with SBS and rubber pyrolysis oil added into Russian asphalt is proved to be suitable for construction, overlay and repair operations of high-grade roads, municipal roads, rural roads, park pavements and the like.
The price of Russian asphalt transported to Heilongjiang province contains about 1500 yuan/ton of tariff, the price of 90-grade base asphalt of Liaoning brocade in the province is about 3500 yuan/ton of Heilongjiang province, the price of SBS polymer modified asphalt is about 4600 yuan/ton, the price of modified asphalt prepared by adding rubber pyrolysis oil and SBS modifier into Russian asphalt is about 2500 yuan/ton, compared with the cost of each ton of SBS polymer modified asphalt, 2100 yuan is reduced, the Russian asphalt has obvious price advantage from the economic cost, the construction cost is reduced, the market supply path is increased, the performance of the modified asphalt and asphalt mixture is the same as that of SBS polymer modified asphalt, and the low-temperature cracking resistance is superior to that of SBS polymer modified asphalt.
In summary, the modified asphalt with the rubber pyrolysis oil modifier and the SBS modifier added into the Russian asphalt has the excellent quality of soft and hard asphalt of SBS polymer modified asphalt in the traditional sense, is introduced into road construction of Heilongjiang province as a new material, reduces engineering cost, enriches the selected and purchased varieties of asphalt varieties of the Heilongjiang province, breaks through the uniqueness of the asphalt market of matrix, gets rid of the dependence of SBS polymer modified asphalt in Liaoning brocade areas, effectively solves the defect of uniqueness of the asphalt production place used by Heilongjiang province, and promotes market competitiveness. The characteristics of the rubber pyrolysis oil modifier, the SBS modifier and the Russian asphalt are combined, the performance of the rubber pyrolysis oil modifier is the same as that of the SBS polymer modified asphalt, and the rubber pyrolysis oil can be doped to effectively delay the occurrence of early diseases of asphalt pavement.
Cases of 2016-2019, which we do in different seasons, different areas and different environments, can be fully confirmed through observation of implementation projects: the Russian asphalt is added with the rubber pyrolysis oil modifier and the SBS modifier, so that the technology is suitable for high-cold areas and summer areas, the pavement at the high temperature of up to 60 ℃ is not softened, is not covered, is not rutted and is not pushed, the pavement at the low temperature of-40 ℃ is not cracked, and the engineering cost is reduced. The modified asphalt is a comprehensive modified asphalt type, and is superior to other asphalt types in low-temperature crack resistance. The construction process, the mixing method, the technical requirements, the quality inspection and the like all meet the requirements of the current technical Specification for highway asphalt pavement construction.
Detailed Description
The invention will be further illustrated with reference to specific examples, but the invention is not limited to the examples.
The method for improving the low-temperature cracking resistance of Russian petroleum asphalt in the following examples comprises the following steps:
step one: heating Russian petroleum asphalt to 130-140 ℃, premixing with SBS and a stabilizer, shearing and grinding by using a colloid mill, continuously stirring and developing at 130-150 ℃, and periodically tracking and detecting performance indexes according to a method specified in JTG E20-2011 (highway asphalt and asphalt mixture test procedure) until the property indexes of the modified asphalt finished product meet the standard requirements specified in JTG F40-2004 (highway asphalt pavement construction technical specification), thus obtaining SBS Russian modified asphalt;
step two: and stirring the rubber pyrolysis oil and the SBS Russian modified asphalt at 130-150 ℃ to obtain the Russian modified asphalt.
Example 1
1. Russian petroleum asphalt quality evaluation
The Russian petroleum asphalt is detected and technically evaluated according to the test method and technical standard specified in the national industry Specification of Highway asphalt pavement construction technical Specification JTG F40-2004, and the summary of test results and analysis and summary conditions are described.
TABLE 1 Russian asphalt test results summary table
Note that: there is no requirement for embrittlement in China, and the table refers to the European CEN bitumen standard (CEN TC19SCI WGIN80, EN 12591:2000) first class.
The test items listed in table 1 basically cover the main indexes for evaluating the asphalt performance, and the analysis is performed for each index:
1) Penetration and penetration index
The penetration is an important index of asphalt classification, and because the sample does not provide standard classification of Russian manufacturers, according to the test result of the penetration and the working experience of many years, russian asphalt of the variety is similar to the conventional Panjin No. 110 asphalt in I province, and meanwhile, an international universal penetration index test (an empirical parameter for describing the temperature sensitivity and the colloid structure type of asphalt) is carried out. The penetration index test result is close to the upper limit of the national industry standard (the data display is also the upper limit of the Russian standard), and meets the index requirement of the current standard in China. This asphalt is highly sensitive to temperature, empirically: during the use of asphalt pavement, it is desirable that asphalt has a small sensitivity to temperature, while during the mixing and paving of asphalt mixture, it is desirable that asphalt has a slightly larger sensitivity.
2) Ductility of
Ductility is an important indicator for evaluating the plastic deformation capability of a viscous asphalt. The ductility of the matrix asphalt is reflected by the deformation (permanent deformation) of the micelles between the asphalt molecules. When the pavement aggregate is contracted and displaced due to temperature reduction when the temperature is reduced, the larger asphalt ductility can provide stronger creep capacity; asphalt with large ductility can adapt to the deformation caused by temperature shrinkage, so that the asphalt has better cracking resistance.
3) Softening point of
The softening point was used to assess the thermal stability of the viscous bitumen. The asphalt has high softening point, shows good heat resistance of petroleum asphalt, can not be rapidly softened after being heated, has higher viscosity at high temperature, and is not easy to deform due to heating, thus showing good heat stability.
4) Dynamic viscosity
Dynamic viscosity is one of the important indexes for evaluating the high-temperature stability of asphalt. The high dynamic viscosity value indicates that the asphalt has higher viscosity toughness, i.e. better high-temperature stability at the same temperature. The test results are better than the corresponding results of the asphalt commonly used in provinces.
5) Wax content
The wax content test result meets the limit value of national standard, the repeatability test deviation is not large, the wax content result is (1.2%), and the wax content is slightly higher than that of the domestic petroleum asphalt.
6) Brittle point
The embrittlement point is the temperature at which the asphalt is measured without causing damage at low temperatures. The method has no hard regulation on the brittle points of asphalt, and only a test method is determined. The test evaluation refers to the European related standard, and the result shows that the brittle points meet the requirements.
7) Water content
The asphalt should not contain water as much as possible, for example, the dehydration process is not mature, which can cause sputtering of the finished asphalt during heating, and harm to human body and equipment. The index test results are good.
8) Solubility of
The solubility of asphalt in a solvent indicates the effective components of asphalt. The asphalt test result is slightly lower than the index of 99.9% of common asphalt in province, but still higher than the national standard value.
9) Conclusion(s)
According to Russian asphalt test results and combined analysis, the asphalt is marked by No. 90, has good high-temperature performance and temperature sensitivity, high low-temperature ductility and low wax content, is suitable for construction in winter low-temperature weather, and is beneficial to improving low-temperature cracking resistance when being used together with rubber pyrolysis oil.
2. Preferably the optimal blending amount range of the rubber pyrolysis oil in the Russian asphalt
The test method adopted below is tested according to JTG E20-2011 rule of national industry standard of road asphalt and asphalt mixture test rule, and is evaluated according to JTG F40-2004 standard of road asphalt pavement construction technical Specification. Firstly, the prepared SBS Russian modified asphalt is heated to 130-150 ℃, rubber pyrolysis oil with different dosages is added and mixed uniformly, and the mixture is left at room temperature for 24 hours, and the following test is carried out.
The mixing amount of the SBS modifier is set to be 3% of the mass of the Russian petroleum asphalt, the mixing amount of the rubber pyrolysis oil is adjusted, five mixing amounts of 6%, 7%, 8%, 9% and 10% of the mass of the Russian modified asphalt are adopted, and the modified asphalt with the five different mixing amounts is tested by using the existing test instrument and equipment and the existing standard test method, so that the test results are as follows.
TABLE 2 technical index of modified asphalt at different blending amount
And (3) analyzing the change condition of each index under different formulas, wherein the penetration is not larger and better, the peak value of the penetration is used for representing the optimal asphalt viscosity, and the index of the modified asphalt with the blending amount of 7-9% in the penetration result meets the requirement. The ductility index is that the higher the doping amount is, the higher the toughness and plasticity of asphalt are, the later strength of the mixture is slowly increased, the cost of the modified asphalt is increased, and 7% -9% of the ductility index is the proper doping amount of the modified asphalt according to the ductility test result analysis. The softening point index is gradually reduced along with the blending proportion of the modifier, the higher the blending amount of the modifier is, the more obvious the temperature reduction is, and 6% -9% of the softening point index is the proper blending amount of the modified asphalt according to the analysis of the softening point test result. The viscosity is continuously increased along with the mixing amount of the modifier, and 7-9% of the viscosity is the proper mixing amount of the modified asphalt on the basis of meeting the main control index of the physical viscosity reduction of the modifier. The indexes of elastic recovery, flash point, solubility and film oven heated are not obviously changed along with the increase of the rubber pyrolysis oil modifier, and the 6-10% blending amount has little influence on the modified asphalt.
In summary, the blending of the rubber pyrolysis oil modifier has an influence on the performance index of the SBS Russian modified asphalt, and the influence of the increase of the blending amount of the rubber pyrolysis oil modifier on the overall cost is considered while the influence of the performance index is considered. Therefore, under the principle of meeting the requirement of the reference 'performance and having smaller mixing amount', the rubber pyrolysis oil modifier is considered to be suitable for controlling the mixing amount of the SBS Russian asphalt modifier within the range of 7-9 percent, and the modified asphalt has excellent performance.
3. Evaluation of low-temperature cracking resistance of asphalt mixture mixed with rubber pyrolysis oil modifier
The test method adopted below is tested according to JTG E20-2011 rule of national industry standard of road asphalt and asphalt mixture test rule, and is evaluated according to JTG F40-2004 standard of road asphalt pavement construction technical Specification. Firstly, the prepared SBS Russian modified asphalt is heated to 130-150 ℃, rubber pyrolysis oil with different dosages is added and mixed uniformly, and the mixture is left at room temperature for 24 hours, and the following test is carried out.
The heating temperature of the aggregate is 10-20 ℃ higher than that of the SBS Russian modified asphalt, mineral powder does not need to be heated, the prepared SBS Russian modified asphalt is added into an asphalt mixture stirring pot, crushed stone and mineral powder are sequentially added, stirring is carried out for at least 180 seconds, and the stirred mixture is placed in a 150 ℃ oven for heat preservation for 3-4 hours, so that the performance test of the asphalt mixture is carried out.
The asphalt mixture split tensile strength, the damage tensile strain and the damage stiffness modulus index are evaluated and analyzed on the low-temperature cracking resistance through the blending amount of different modifiers (rubber pyrolysis oil), and the blending amount range of the modifier with optimal low-temperature cracking resistance is optimized.
TABLE 3 detection results of low temperature crack resistance of asphalt mixtures with different modifier contents
From the analysis of the results of splitting tensile strength, breaking tensile strain and stiffness modulus, the splitting tensile strength, breaking tensile strain and stiffness modulus of the asphalt mixture with the blending amount of 6 percent of rubber pyrolysis oil are lower than those of other modifiers, and the splitting strength, breaking tensile strain and stiffness modulus of the asphalt mixture with the blending amount of 7-10 percent of rubber pyrolysis oil are in a trend of increasing, which shows that the increase of the blending amount of the rubber pyrolysis oil improves the low-temperature cracking resistance, and the blending amount of the rubber pyrolysis oil is more suitable for 7-9 percent of the mass of SBS Russian modified asphalt in consideration of economic cost.
4. Low-temperature cracking resistance comparison evaluation of common asphalt variety
The common matrix asphalt and modified asphalt mixture are subjected to low-temperature and high-temperature performance comparison according to the test method of JTG E20-2011 regulations of Highway asphalt and asphalt mixture test by adopting the same mineral aggregate grading and the same asphalt dosage, wherein the standard test temperature of the high-temperature performance is 60 ℃, and the standard test temperature of the low-temperature anti-cracking performance is-10 ℃. The advantages of the mixture in the aspect of low-temperature cracking resistance after the rubber pyrolysis oil modifier, the SBS modifier and the Russian asphalt are compatible are obtained through the comparison analysis of test results.
TABLE 4 results of Low temperature crack resistance test for commonly used asphalt varieties
TABLE 5 results of high temperature testing of commonly used asphalt varieties
From the analysis of rutting index, splitting tensile strength, breaking tensile strain and stiffness modulus results, the asphalt mixture rutting index, splitting tensile strength, breaking tensile strain and stiffness modulus of Liaoning Panjin No. 90 are lower than those of other asphalt types, the modified asphalt mixture doped with rubber pyrolysis oil modifier in Russian asphalt is higher than the rutting index, splitting strength, breaking tensile strain and stiffness modulus of SBS polymer modified asphalt mixture, and the breaking stiffness modulus and rutting index of the rubber pyrolysis oil modified asphalt mixture are superior to those of SBS polymer modified asphalt mixture, so that the high-low temperature performance of the mixture of rubber pyrolysis oil in Russian asphalt can be considered, and the low-temperature crack resistance is better and superior to that of SBS polymer modified asphalt.
5. Conclusion(s)
A large number of indoor test results prove that the asphalt and asphalt mixture mixed with the rubber pyrolysis oil modifier and the SBS modifier in Russian asphalt has better high-temperature performance and lower-temperature cracking performance than other asphalt varieties, the optimal mixing amount of the rubber pyrolysis oil modifier is 7-9%, the mixing amount of the SBS modifier is 3%, the modified asphalt performance and the asphalt mixture performance are better, and the lower-temperature cracking performance is better than that of other asphalt varieties. The modified asphalt concrete doped with the rubber pyrolysis oil modifier and the SBS modifier in the Russian asphalt has the production cost reduced by more than 40 percent compared with that of SBS polymer modified asphalt concrete, and is the preferred asphalt concrete type in Heilongjiang province.
While the invention has been described in terms of preferred embodiments, it is not intended to be limited thereto, but rather to enable any person skilled in the art to make various changes and modifications without departing from the spirit and scope of the present invention, which is therefore to be limited only by the appended claims.
Claims (2)
1. A method for improving the low temperature crack resistance of russian petroleum asphalt, comprising the steps of:
step one: modifying Russian petroleum asphalt by using an SBS polymer modifier and an asphalt stabilizer to obtain SBS Russian modified asphalt: the doping amount of the SBS polymer modifier is 3% of the mass of the Russian petroleum asphalt; the modification is carried out according to the following method: heating Russian petroleum asphalt to 130-140 ℃, premixing with SBS and asphalt stabilizer, shearing and grinding by using a colloid mill, continuously stirring and developing at 130-150 ℃, and periodically tracking and detecting according to a method specified in JTG E20-2011 (highway asphalt and asphalt mixture test procedure) until the property index of a modified asphalt finished product meets the standard requirement specified in JTG F40-2004 (highway asphalt pavement construction technical Specification), thus obtaining SBS Russian modified asphalt;
step two: rubber pyrolysis oil is mixed into the SBS Russian modified asphalt, and the Russian modified asphalt is obtained through stirring; the doping amount of the rubber pyrolysis oil is 7% -9% of the mass of SBS Russian modified asphalt; the stirring is to stir the rubber pyrolysis oil and SBS Russian modified asphalt together at 130-150 ℃.
2. The russian modified asphalt of claim 1, prepared by the method of improving the low temperature crack resistance of a russian petroleum asphalt.
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| CN101508789B (en) * | 2009-03-06 | 2011-06-15 | 武汉科技大学 | Composite modified asphalt for high-grade high road and preparation thereof |
| CN101985524A (en) * | 2010-08-18 | 2011-03-16 | 中國禾森石化控股有限公司 | Compound SBS modified asphalt and preparation method thereof |
| CN102604180B (en) * | 2012-02-10 | 2013-10-09 | 中胶橡胶资源再生（青岛）有限公司 | High-concentration modifying rubber powder and preparation method thereof |
| CN103360773B (en) * | 2013-07-18 | 2015-09-02 | 华南理工大学 | A kind of composite asphalt modifier and preparation method thereof and application |
| CN104194364B (en) * | 2014-09-11 | 2016-07-20 | 广西国创道路材料有限公司 | Composite asphalt modifier, composite modified asphalt and production technology thereof |
| CN105985531B (en) * | 2015-02-03 | 2018-12-04 | 吕刚 | The method for preparing various temperature condition asphalt modifier and modified pitch using waste rubber oil |
| CN105985653A (en) * | 2015-02-03 | 2016-10-05 | 吕刚 | Normal temperature asphalt modifier prepared by using waste rubber oil and preparation method of modified asphalt |
| CN104693821B (en) * | 2015-02-16 | 2018-03-23 | 天津海泰环保科技发展股份有限公司 | A kind of asphalt and preparation method using direct putting type high-adhesiveness modifying agent |
| CN104693822B (en) * | 2015-02-16 | 2018-09-25 | 天津海泰环保科技发展股份有限公司 | A kind of low-temperature ductility of modified pitch, high temperature resistant storage stability auxiliary agent and preparation method thereof and modified pitch |
| CN105331127A (en) * | 2015-11-26 | 2016-02-17 | 佛山高富中石油燃料沥青有限责任公司 | Improved SBS (Styrene Butadiene Styrene) modified asphalt and manufacturing method thereof |
| CN108641384A (en) * | 2018-05-16 | 2018-10-12 | 重庆交通大学 | A kind of warm-mixed asphalt modifying agent and preparation method thereof |
| CN109678399B (en) * | 2019-02-25 | 2019-09-20 | 内蒙古高等级公路建设开发有限责任公司 | A kind of Warm-Mix Bitumen Mixture and preparation method thereof |
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2019
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