CN112280323A - Preparation method of asphalt regenerant with large-proportion RAP mixing amount - Google Patents
Preparation method of asphalt regenerant with large-proportion RAP mixing amount Download PDFInfo
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- CN112280323A CN112280323A CN202011212180.1A CN202011212180A CN112280323A CN 112280323 A CN112280323 A CN 112280323A CN 202011212180 A CN202011212180 A CN 202011212180A CN 112280323 A CN112280323 A CN 112280323A
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- asphalt
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L21/00—Compositions of unspecified rubbers
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Abstract
The invention discloses a preparation method of an asphalt regenerant with RAP mixed in a large proportion, belongs to the field of road engineering, and aims to solve the problem of low regeneration efficiency of waste asphalt mixtures. The preparation method comprises the following steps: weighing biological asphalt, rubber oil, styrene, SBS and corn straw fiber as raw materials; stirring and mixing the biological asphalt, the styrene, part of the rubber oil and the corn straw fiber to obtain a component A; adding SBS particles into the rubber oil, and heating and stirring to obtain a component B; and fourthly, mixing the component A and the component B to obtain the asphalt recycling agent. After the biological asphalt of the invention is reacted with styrene, the bonding effect between the regenerated asphalt and stone can be enhanced. SBS and rubber oil solution can be used as interface reinforcing component, further enhances the interface performance of the mixture and improves the durability. Ensuring the stability of the large-proportion regeneration performance of RAP. The asphalt regenerant prepared by the invention can realize large-scale regeneration application of RAP more than 50%.
Description
Technical Field
The invention belongs to the field of road engineering, and particularly relates to a preparation method of an asphalt recycling agent with a large RAP proportion.
Background
In recent years, with the flourishing economy of our country, the construction of the road engineering field of our country has also been rapidly developed. By the end of 2018, the mileage of the expressway in China reaches 14.3 kilometers and is the first place in the world. The asphalt concrete pavement is convenient to maintain and high in driving comfort, so that the asphalt concrete pavement is widely used in high-grade highways. However, the design life of asphalt pavements in China is about 10-15 years, and a considerable amount of asphalt pavements reach or approach the service life to the present, and are facing large-scale maintenance and repair and even reconstruction. In addition, due to the shortage of resources and the requirement of environmental protection policy, high-quality stone materials for asphalt pavements are increasingly deficient, the stone materials are less and less in source, the transportation distance of the stone materials is increased, and the cost is increased. In addition, with the shortage and even exhaustion of petroleum resources, the yield of high-quality asphalt materials is seriously affected. The lack of natural resources has gradually influenced the development of road traffic. Sustainable development is urgently needed in the field of road engineering.
On the other hand, the asphalt pavement regeneration technology can well treat waste asphalt mixture (RAP), can effectively reduce the use of energy resources, and has great economic and environmental benefits. As the old mixture is subjected to the influence of external factors such as ultraviolet radiation, high-temperature oxidation, water erosion, load action and the like in mixing, transportation and construction and in service period, the asphalt in the old mixture is seriously aged, and the performance is greatly changed. Therefore, in the process of regenerating the old asphalt mixture, the asphalt mixture is often used together with a regenerant, and particularly under the condition of high blending ratio of the old asphalt mixture, the addition of the regenerant is necessary. The main functions of the regenerant are to adjust and improve component unbalance caused by aging of the asphalt material, repair and promote the service performance of the aged asphalt material, and thus improve the durability of the regenerated asphalt mixture. At present, the regeneration theory is to be perfected, the regenerant products are not good and uniform, and the regeneration efficiency of the waste asphalt mixture is relatively low. Therefore, the development of a novel efficient regenerant and the realization of the large-proportion regeneration application of the waste asphalt mixture have important social significance and practical significance.
Disclosure of Invention
The invention aims to solve the problem of low regeneration efficiency of waste asphalt mixtures, and provides a preparation method of an asphalt regenerant with a large RAP mixing amount.
The preparation method of the asphalt regenerant with the RAP mixed in a large proportion is realized according to the following steps:
weighing 40-60 parts of biological asphalt, 40-60 parts of rubber oil, 5-10 parts of styrene, 3-5 parts of SBS and 5-10 parts of corn straw fiber according to parts by mass as raw materials;
placing the biological asphalt in the raw materials into a container, adding styrene, uniformly stirring, adding part of rubber oil in the raw materials, continuously stirring, adding corn straw fiber, stirring to obtain a mixed solution, and heating at the temperature of 50-70 ℃ for 3-5 hours to obtain a component A;
thirdly, placing the residual rubber oil in the raw materials into a container, adding SBS particles, and stirring at 35-50 ℃ to obtain a component B;
and fourthly, uniformly mixing the component A and the component B to obtain the asphalt regenerant with the RAP mixed in a large proportion.
The biological asphalt in the asphalt regenerant with the RAP in a large proportion belongs to a secondary product of renewable energy substances, has low viscosity, can be mixed and constructed at a lower temperature, saves energy, and conforms to the concept of sustainable development. The biological asphalt is residual oil obtained after the biological diesel oil is extracted from waste oil, can play a role in cementing components, and can also play a role in diffusion due to low viscosity. The rubber oil mainly contains naphthenic base, aromatic base and a small amount of colloid. The rubber oil can be used as a good diffusion component and can play a role in rapidly diffusing and recovering the characteristics of the aged asphalt. The styrene can promote micromolecular free radicals in the biological asphalt to perform polymerization reaction, and the adhesion of the biological asphalt is improved, so that the durability of the regenerated asphalt mixture is improved. The corn stalk fiber has porous surface and good oil absorption effect, can improve the performance of asphalt mucilage and improve the deformation resistance of the regenerated mixture. SBS belongs to a high molecular polymerization reinforced component, can effectively enhance the interface performance and improve the high and low temperature crack resistance of the material. The component A consists of biological asphalt, rubber oil, styrene and corn straw fiber, and mainly plays a role in diffusing and supplementing cementing components in time; the SBS and the rubber oil form a component B, and the component B mainly plays a role in reinforcing polymerization and further enhancing the interface performance.
Because the aging degree of the asphalt in the RAP is generally deep, the diffusion and fusion characteristics of the regenerant are important functional attributes in the process of recycling the RAP, the viscosity of the biological asphalt and the rubber oil is low, the diffusion characteristics are excellent, and the two components can be mixed and dissolved with the asphalt in any proportion. In addition, after the biological asphalt of the invention is reacted with styrene, the bonding effect between the regenerated asphalt and stone can be improved. SBS and rubber oil solution can be used as interface reinforcing component, further enhances the interface performance of the mixture and improves the durability. Ensuring the stability of the large-proportion regeneration performance of RAP. The asphalt regenerant prepared by the invention can realize large-scale regeneration application of RAP more than 50%.
Detailed description of the invention
The first embodiment is as follows: the preparation method of the asphalt regenerant with the RAP mixed in a large proportion is implemented according to the following steps:
weighing 40-60 parts of biological asphalt, 40-60 parts of rubber oil, 5-10 parts of styrene, 3-5 parts of SBS and 5-10 parts of corn straw fiber according to parts by mass as raw materials;
placing the biological asphalt in the raw materials into a container, adding styrene, uniformly stirring, adding part of rubber oil in the raw materials, continuously stirring, adding corn straw fiber, stirring to obtain a mixed solution, and heating at the temperature of 50-70 ℃ for 3-5 hours to obtain a component A;
thirdly, placing the residual rubber oil in the raw materials into a container, adding SBS particles, and stirring at 35-50 ℃ to obtain a component B;
and fourthly, uniformly mixing the component A and the component B to obtain the asphalt regenerant with the RAP mixed in a large proportion.
The second embodiment is as follows: the difference between the first embodiment and the second embodiment is that the fiber length of the corn stalk fiber is 0.5 mm-5 mm, and the fiber diameter is 50-300 μm.
The third concrete implementation mode: the second embodiment is different from the first or second embodiment in that the biological asphalt in the raw material is placed in a container, styrene is added, and the mixture is stirred for 10-15 minutes at the normal temperature of 180-240 r/min.
The fourth concrete implementation mode: the difference between the embodiment and one of the first to third embodiments is that the rubber oil added in the second step accounts for 60 to 70 percent of the total mass of the rubber oil in the first step.
The fifth concrete implementation mode: this embodiment differs from one of the first to fourth embodiments in that the heating at 60 ℃ for 4 hours in step two gives the component A.
The sixth specific implementation mode: this embodiment is different from one of the first to fifth embodiments in that the stirring treatment at 40 ℃ for 30 minutes in the third step gives the B component.
The seventh embodiment: the sixth embodiment is different from the sixth embodiment in that the stirring speed is 300 r/min.
The specific implementation mode is eight: the difference between the present embodiment and one of the first to seventh embodiments is that the mass ratio of the bio-asphalt to the rubber oil in the second step is 1:1 to 1.4: 1.
The specific implementation method nine: the difference between the present embodiment and one of the first to eighth embodiments is that the mass ratio of the SBS particles to the rubber oil in the third step is 1:3 to 1: 10.
The detailed implementation mode is ten: the difference between the present embodiment and the first to ninth-eighth embodiments is that the component A and the component B in the fourth step are uniformly mixed at 60 to 70 ℃.
The first embodiment is as follows: the preparation method of the asphalt regenerant with the RAP mixed in a large proportion is implemented according to the following steps:
weighing 50 parts of biological asphalt, 60 parts of rubber oil, 10 parts of styrene, 5 parts of SBS and 10 parts of corn straw fiber as raw materials in parts by mass;
placing 50 parts of biological asphalt into a container, adding 10 parts of styrene, stirring for 15 minutes at normal temperature at 200r/min, adding 40 parts of rubber oil, stirring for 15 minutes at 120r/min, then adding 10 parts of corn straw fiber, stirring for 30 minutes at normal temperature at 200r/min to obtain a mixed solution, heating for 4 hours at the temperature of 60 ℃ to obtain a component A, and sealing and storing;
placing 20 parts of rubber oil into a container, adding 5 parts of SBS particles, stirring at 40 ℃ at 300r/min for 30 minutes to obtain a component B, and sealing and storing;
and fourthly, uniformly mixing the component A and the component B to obtain the asphalt regenerant with the RAP mixed in a large proportion.
Biological asphalt: the rubber oil mass ratio is 1:1, which is used as a control group 1, and the mass ratio of a substrate No. 90 asphalt: the mass ratio of the rubber oil to the rubber oil is 1:1, and the rubber oil is used as a control group 2, and the large-proportion regeneration performance test verification of the waste asphalt mixture is carried out. The strength performance of the recycled mixture is verified by a Marshall stability test, the high-temperature stability of the recycled mixture is verified by a rutting test, the low-temperature performance of the recycled asphalt mixture is verified by a low-temperature trabecula test, and the water damage resistance performance of the recycled mixture is verified by a freeze-thaw strength ratio.
When the recycled material of a highway in northeast China with service for more than 15 years is used, the old asphalt content is 3.7%, the old material gradation reaches the AC-16 standard, the blending proportion of the old material is 100%, and the blending proportion of the regenerant is such that the oilstone ratio of the AC-16 regenerated mixture reaches 4.9%. The test results are shown in table 1.
TABLE 1 Performance index of recycled asphalt mixture
| Road performance | Control group 1 | Control group 2 | Example one |
| Marshall stable (kN) | 5.1 | 7.0 | 8.9 |
| Degree of dynamic stability (times/mm) | 1926 | 2531 | 2585 |
| Maximum bending strain (mu epsilon) | 2221 | 2056 | 2694 |
| Freeze-thaw strength ratio (%) | 92.2 | 93.4 | 96.5 |
Compared with the control group, the regenerant prepared by the embodiment has better road performance. Control 1 had slightly lower marshall stability and control 2 had lower low temperature bending strain. In general, the recycled mixture of the first embodiment has improved high-temperature, low-temperature and water-resistant stability compared with the control group, and meets the requirements of related technical indexes in the specification.
Example two: the preparation method of the asphalt regenerant with the RAP mixed in a large proportion is implemented according to the following steps:
weighing 60 parts of biological asphalt, 55 parts of rubber oil, 10 parts of styrene, 5 parts of SBS and 10 parts of corn straw fiber as raw materials in parts by mass;
placing 60 parts of biological asphalt into a container, adding 10 parts of styrene, stirring for 15 minutes at normal temperature at 200r/min, adding 25 parts of rubber oil, stirring for 15 minutes at 120r/min, then adding 10 parts of corn straw fiber, stirring for 30 minutes at normal temperature at 200r/min to obtain a mixed solution, heating for 4 hours at the temperature of 60 ℃ to obtain a component A, and sealing and storing;
placing 30 parts of rubber oil into a container, adding 5 parts of SBS particles, stirring at 40 ℃ at 300r/min for 30 minutes to obtain a component B, and sealing and storing;
and fourthly, uniformly mixing the component A and the component B to obtain the asphalt regenerant with the RAP mixed in a large proportion.
Biological asphalt: the rubber oil mass ratio is 1:1, which is used as a control group 1, and the mass ratio of a substrate No. 90 asphalt: the mass ratio of the rubber oil to the rubber oil is 1:1, and the rubber oil is used as a control group 2, and the large-proportion regeneration performance test verification of the waste asphalt mixture is carried out. The strength performance of the recycled mixture is verified by a Marshall stability test, the high-temperature stability of the recycled mixture is verified by a rutting test, the low-temperature performance of the recycled asphalt mixture is verified by a low-temperature trabecula test, and the water damage resistance performance of the recycled mixture is verified by a freeze-thaw strength ratio.
The reclaimed materials of a highway which is used for more than 15 years in service in northeast regions are used, the old asphalt content is 3.7 percent, the old material gradation reaches the AC-16 standard, the old material blending proportion is 100 percent, the regenerant blending proportion standard is that the asphalt-stone ratio of the AC-16 regenerated mixture reaches 4.9 percent, and the mixture blending temperature is 100 ℃. The test results are shown in table 2.
TABLE 2 Performance index of recycled asphalt mixture
| Road performance | Control group 1 | Control group 2 | Example two |
| Marshall stable (kN) | 5.1 | 7.0 | 8.2 |
| Degree of dynamic stability (times/mm) | 1926 | 2531 | 2742 |
| Maximum bending strain (mu epsilon) | 2221 | 2056 | 2264 |
| Freeze-thaw strength ratio (%) | 92.2 | 93.4 | 92.8 |
The regenerant prepared in example two exhibited substantially good road performance compared to the control. The freeze-thaw strength ratio index is slightly reduced compared with the control group 2, and the other indexes are more prominent than the control groups 1 and 2. The reclaimed asphalt mixture of the second embodiment basically meets the requirements of relevant technical indexes in the specification.
The pavement performance of the recycled asphalt mixture prepared by the regenerant in the first embodiment can meet various index requirements of high-grade highways, and the pavement performance of the recycled asphalt mixture prepared by the regenerant in the second embodiment can meet various index requirements of the high-grade highways except that the low-temperature performance is slightly lower than the index requirements. The regenerated asphalt mixture prepared by the regenerants of the two embodiments can completely meet the technical standards of second-level roads and other roads, and realizes the super-large proportion mixing amount of RAP. The research result not only effectively utilizes the waste asphalt mixture, but also saves a large amount of energy, and has better social and environmental benefits.
Claims (10)
- A preparation method of an asphalt regenerant with a large RAP proportion is characterized by comprising the following steps:weighing 40-60 parts of biological asphalt, 40-60 parts of rubber oil, 5-10 parts of styrene, 3-5 parts of SBS and 5-10 parts of corn straw fiber according to parts by mass as raw materials;placing the biological asphalt in the raw materials into a container, adding styrene, uniformly stirring, adding part of rubber oil in the raw materials, continuously stirring, adding corn straw fiber, stirring to obtain a mixed solution, and heating at the temperature of 50-70 ℃ for 3-5 hours to obtain a component A;thirdly, placing the residual rubber oil in the raw materials into a container, adding SBS particles, and stirring at 35-50 ℃ to obtain a component B;and fourthly, uniformly mixing the component A and the component B to obtain the asphalt regenerant with the RAP mixed in a large proportion.
- 2. The method for preparing the asphalt recycling agent with a large proportion of RAP according to claim 1, wherein the fiber length of the corn stalk fiber is 0.5 mm-5 mm, and the fiber diameter is 50-300 μm.
- 3. The method for preparing asphalt recycling agent with large proportion of RAP according to claim 1, wherein in the second step, the biological asphalt in the raw material is placed in a container, added with styrene, and stirred at 180 r/min-240 r/min for 10-15 minutes at normal temperature.
- 4. The method for preparing the asphalt recycling agent with a large proportion of RAP according to claim 1, wherein the rubber oil added in the second step accounts for 60-70% of the total mass of the rubber oil in the first step.
- 5. The method for preparing asphalt recycling agent with large proportion of RAP according to claim 1, wherein the component A is obtained by heating at 60 ℃ for 4 hours in the second step.
- 6. The method for preparing asphalt recycling agent with large proportion of RAP according to claim 1, wherein the component B is obtained by stirring at 40 ℃ for 30 minutes in the third step.
- 7. The method for preparing asphalt recycling agent with large proportion of RAP according to claim 6, characterized in that the stirring speed is 300 r/min.
- 8. The method for preparing the asphalt recycling agent with the large RAP mixing amount according to claim 1, wherein the mass ratio of the biological asphalt to the rubber oil in the second step is 1: 1-1.4: 1.
- 9. The preparation method of the asphalt recycling agent with a large RAP mixing amount according to claim 1, wherein the mass ratio of SBS particles to rubber oil in the third step is 1: 3-1: 10.
- 10. The method for preparing the asphalt recycling agent with large-proportion RAP mixing amount according to claim 1, wherein the component A and the component B in the step four are uniformly mixed at 60-70 ℃.
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Cited By (2)
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| CN113214660A (en) * | 2021-04-22 | 2021-08-06 | 江阴市新远见工程有限公司 | Waterproof wear-resistant regenerated asphalt and preparation method thereof |
| CN113896457A (en) * | 2021-11-02 | 2022-01-07 | 福建省国泰建设有限公司 | Composite thermal regeneration asphalt mixture and preparation method thereof |
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| CN113896457A (en) * | 2021-11-02 | 2022-01-07 | 福建省国泰建设有限公司 | Composite thermal regeneration asphalt mixture and preparation method thereof |
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