CN114573272B - Regeneration method for microwave heating activation of old asphalt mixture - Google Patents
Regeneration method for microwave heating activation of old asphalt mixture Download PDFInfo
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- CN114573272B CN114573272B CN202210092278.0A CN202210092278A CN114573272B CN 114573272 B CN114573272 B CN 114573272B CN 202210092278 A CN202210092278 A CN 202210092278A CN 114573272 B CN114573272 B CN 114573272B
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- 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
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- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
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- 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
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- 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
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Abstract
The invention aims to provide a regeneration method for microwave heating and activating of an old asphalt mixture, which can fully heat and activate the old asphalt, save energy, control heating temperature and time, effectively prevent secondary aging of the asphalt, and highlight the advantages of the microwave heating and regeneration of the asphalt as certain properties of the obtained asphalt reclaimed material exceed those of the original asphalt. A regeneration method for microwave heating activation of old asphalt mixture comprises the following steps: grading, screening and classifying the milled old asphalt mixture; fully mixing the old asphalt mixture with graphite powder; and respectively heating and activating the graded and screened old asphalt mixture under different microwave conditions, adding the new and old asphalt mixtures according to a specified sequence in the mixing process, heating and stirring, and obtaining the regenerated asphalt mixture after the completion.
Description
Technical Field
The invention relates to a regeneration method for microwave heating activation of an old asphalt mixture, belonging to the technical field of old asphalt regeneration.
Background
Because the asphalt pavement has good road performance and driving comfort, most of high-grade highway pavements in China adopt the asphalt pavement at present, highway construction in China develops at a high speed in the 21 st century, and then the scale of highway maintenance engineering and service is expanded continuously, so that a plurality of expressways constructed earlier need to be overhauled. In the process of maintenance, repair and reconstruction and extension of Asphalt pavements, a large amount of waste Asphalt mixtures (RAP) can be generated, and not only can land resources be occupied by the waste Asphalt mixtures, but also environmental pollution can be caused, and the health of surrounding residents can be harmed. With the gradual deepening of concepts of green, environmental protection, energy conservation and the like, the regeneration technology of the old asphalt pavement is concerned widely. The waste asphalt mixture is recycled, so that the requirements of road construction on stone and asphalt can be reduced, the road construction cost is reduced, the method has important significance on mineral resources and environmental protection, and the method is an important way for sustainable development of road traffic.
The thermal regeneration technology is applied in many places in China, and at present, two main ways for activating the old asphalt mixture by thermal regeneration are as follows: respectively heating by open fire and heating by hot air circulation. However, both of these approaches have different degrees of disadvantages: the open fire heating is to directly heat the asphalt pavement by utilizing flame, the heating temperature is difficult to control, and the flame is directly contacted with the asphalt pavement, so that the secondary aging of the asphalt mixture is easily caused; the heated air circulation heating is to heat air by using fuel, and then the hot air is sprayed to the surface of the old asphalt mixture through the air nozzle to heat, so that the heating efficiency is low, the lower-layer asphalt mixture is difficult to activate, hot air leakage is easy to generate, and energy is wasted.
The recycled asphalt mixtures produced by the two heating methods have higher viscosity and rigidity, lower asphalt activation degree, generally poorer workability, difficult on-site compaction, and easy occurrence of cracking, loosening and other pavement diseases related to durability, thereby reducing the service life of the pavement. Therefore, the research on the regeneration of the waste asphalt is very important.
Disclosure of Invention
The invention aims to provide a regeneration method for microwave heating and activating of an old asphalt mixture, which can fully heat and activate the old asphalt, save energy, control heating temperature and time, effectively prevent secondary aging of the asphalt, and highlight the advantages of the microwave heating and regeneration of the asphalt due to the fact that certain properties of the obtained asphalt reclaimed material exceed those of the original asphalt.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a regeneration method for microwave heating activation of old asphalt mixture comprises the following steps:
s1, grading, screening and classifying the milled old asphalt mixture;
s2, fully mixing the old asphalt mixture with graphite powder, wherein the addition amount of the graphite powder is calculated according to the following formula:
in the formula: x is the adding amount of graphite powder;
alpha is the doping amount coefficient;
M 1 the quality of the old asphalt mixture with certain particle size;
α 1 the asphalt content in the old asphalt mixture;
and S3, respectively heating and activating the graded and screened old asphalt mixture under different microwave conditions, adding the new and old asphalt mixture according to a specified sequence in the mixing process, heating and stirring, and obtaining the regenerated asphalt mixture after the completion.
On the basis of the regeneration method for microwave heating activation of the old asphalt mixture, the milled old asphalt mixture is screened according to three distribution intervals of more than 9.5mm, 2.36-9.5 mm and less than 2.36 mm.
On the basis of the regeneration method for microwave heating and activating the old asphalt mixture, the alpha of the old asphalt mixture with the thickness of more than 9.5mm is 0.35 to 0.4; the alpha of the old asphalt mixture of 2.36 to 9.5mm is 0.3 to 0.35; the alpha of the old asphalt mixture less than 2.36mm is 0.2 to 0.3.
On the basis of the regeneration method for microwave heating activation of the old asphalt mixture, the specification of graphite powder selected for the old asphalt mixture with the thickness of more than 9.5mm is 500 meshes, the specification of graphite powder selected for the old asphalt mixture with the thickness of 2.36-9.5 mm is 300 meshes, the specification of graphite powder selected for the old asphalt mixture with the thickness of less than 2.36mm is 200 meshes, the resistivity of the graphite powder is 8.0 mu omega m, the thermal conductivity is 140W/mK, the volume density is 1.75g/cm < 3 >, and the thermal expansion coefficient is 2.4 multiplied by 10 -6 /℃。
On the basis of the regeneration method for microwave heating and activating the old asphalt mixture, 25mm is adopted for paving the old asphalt mixture with the thickness of more than 9.5mm, 4kW is adopted for microwave heating power, the microwave frequency is 3000MHz, and the heating time is 100s; paving 20mm of old asphalt mixture of 2.36-9.5 mm, wherein the paving thickness is 4kW, the microwave heating power is 2500MHz, and the heating time is 90s; the paving thickness of the old asphalt mixture of <2.36mm is 15mm, the microwave heating power is 3kW, the microwave frequency is 2500MHz, and the heating time is 80s.
On the basis of the regeneration method for microwave heating activation of the old asphalt mixture, the old asphalt mixture with the diameter larger than 9.5mm, new asphalt and new aggregate are poured into an asphalt mixing machine and stirred for 80s, then the old asphalt mixture with the diameter of 2.36-9.5 mm is added and stirred for 30s, and finally the old asphalt mixture with the diameter smaller than 2.36mm is added and stirred for 90s.
The invention has the advantages that:
according to the invention, old asphalt mixtures are classified in grades, and are sequentially paved and heated after being doped with different specifications of graphite, and the three old asphalt mixtures with different particle sizes respectively control factors such as different heating time and heating power, so that the old asphalt mixtures with different particle sizes can be fully heated and activated, and secondary aging caused by overhigh asphalt temperature is prevented. Through multiple experiments, the old asphalt mixture heated by the method is high in activation degree and low in aging degree, and secondary aging of asphalt is effectively prevented. When the regenerated asphalt mixture is manufactured, the regenerant is added to mix and stir the old asphalt mixture with different particle sizes in batches, and the heating sequence can ensure that the new asphalt mixture and the old asphalt mixture after heating activation can be fully mixed without layering, thereby ensuring the pavement performance of the regenerated asphalt mixture.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 shows the temperature rise rates of three old asphalt mixtures treated by the method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described in the background of the invention: the existing reclaimed asphalt mixture has higher viscosity and rigidity, lower asphalt activation degree, generally poorer workability, difficult on-site compaction and easy occurrence of cracking, loosening and other pavement diseases related to durability, thereby reducing the service life of the pavement. In order to solve the problems, the invention adopts the following scheme:
a regeneration method for microwave heating activation of old asphalt mixture comprises the following steps:
s1, grading, screening and classifying the milled old asphalt mixture;
s2, fully mixing the old asphalt mixture with graphite powder, wherein the adding amount of the graphite powder is calculated according to the following formula:
in the formula: x is the addition amount of graphite powder;
alpha is the doping amount coefficient;
M 1 is old with a certain particle sizeThe quality of the asphalt mixture;
α 1 the asphalt content in the old asphalt mixture;
and S3, respectively heating and activating the graded and screened old asphalt mixture under different microwave conditions, adding the new and old asphalt mixture according to a specified sequence in the mixing process, heating and stirring, and obtaining the regenerated asphalt mixture after the completion.
Example 1
S1, screening the milled old asphalt mixture according to three particle sizes of more than 9.5mm, 2.36-9.5mm and less than 2.36mm, respectively putting the old asphalt mixture with the three particle sizes into an oven, keeping the temperature at 60 ℃, drying for 2 hours, and storing in a sealed manner after drying;
s2, taking 250g of an old asphalt mixture larger than 9.5mm, weighing 8g of 500-mesh graphite powder according to a formula, and fully mixing the graphite powder with the asphalt mixture, taking 500g of the old asphalt mixture smaller than 2.36-9.5 mm, weighing 14g of 300-mesh graphite powder according to the formula, fully mixing the graphite powder with the asphalt mixture, taking 250g of the old asphalt mixture smaller than 2.36mm, weighing 6.75g of 200-mesh graphite powder according to the formula, and fully mixing the graphite powder with the asphalt mixture;
s3, uniformly paving the old asphalt mixture larger than 9.5mm on a crucible, taking 25mm of paving thickness, taking 4kW of microwave heating power, setting the microwave frequency to be 3000MHz and the heating time to be 100S, putting the crucible into microwave heating equipment, starting heating, and taking out for later use after heating is finished;
s4, uniformly spreading the old asphalt mixture of 2.36-9.5 mm on a crucible, wherein the spreading thickness is 20mm, the microwave heating power is 4kW, the microwave frequency is 2500MHz, the heating time is set to be 90S, putting the crucible into microwave heating equipment, starting heating, and taking out the crucible for later use after heating is completed;
s5, uniformly spreading the old asphalt mixture smaller than 2.36mm on a crucible, uniformly spreading the old asphalt mixture with the spreading thickness of 15mm on the crucible, uniformly spreading the old asphalt mixture on the crucible, putting the crucible into microwave heating equipment to start heating, and taking out the old asphalt mixture for later use after heating, wherein the microwave heating power is 3kW, the microwave frequency is 2500MHz, and the heating time is 80S.
S6, respectively weighing 50g of old materials with three particle sizes again, dissolving and extracting asphalt in the old asphalt mixture by using trichloroethylene, screening the old aggregates by using a rotary evaporation method after extraction is finished, preparing new asphalt aggregates according to the same set of the old asphalt according to screening results, wherein the specific aggregate set is the same as the old asphalt, determining the asphalt-asphalt ratio according to extracted asphalt, and the asphalt-asphalt ratio of the new asphalt mixture is also the same.
S7, weighing 1000g of new asphalt and new aggregate according to the extraction result, using new asphalt mucilage, putting the new aggregate into an oven to be heated to 190 ℃ for later use, and putting the new asphalt into the oven to be heated to 160 ℃ for later use.
S8, setting a target temperature of the asphalt mixer to be 160 ℃, starting heating until the asphalt mixer reaches the target temperature, pouring the old asphalt mixture with the thickness of more than 9.5mm, the new asphalt and the new aggregate into the asphalt mixer, stirring for 80S, adding the old asphalt mixture with the thickness of 2.36-9.5 mm, stirring for 30S, and finally adding the old asphalt mixture with the thickness of less than 2.36mm, and stirring for 90S.
And S9, taking out the reclaimed materials after the mixing is finished, putting the reclaimed materials into a Marshall compaction apparatus, manufacturing a Marshall standard test block, and detecting the road performance of the reclaimed asphalt mixture.
Example 2
S1, screening the milled old asphalt mixture according to three particle sizes of more than 9.5mm, 2.36-9.5 mm and less than 2.36mm, respectively putting the old asphalt mixture with the three particle sizes into an oven, keeping the temperature at 60 ℃, drying for 2 hours, and sealing and storing after drying;
s2, weighing 250g of old asphalt mixture with the thickness of more than 9.5mm, 500g of old asphalt mixture with the thickness of 2.36-9.5 mm and 250g of old asphalt mixture with the thickness of less than 2.36mm, fully mixing the old asphalt mixture with the asphalt mixture, uniformly spreading the old asphalt mixture on a crucible, taking the spreading thickness of 25mm, fully mixing the three mixtures, putting the mixture into an oven, setting the target temperature to be 160 ℃, and taking the mixture out when the temperature is detected to be 160 ℃ by using an infrared thermal gun.
And S3, respectively weighing 50g of the old materials with the three particle sizes again, dissolving and extracting asphalt in the old asphalt mixture by using trichloroethylene, screening the old aggregates by using a rotary evaporation method after extraction is finished, preparing new asphalt aggregates according to the same set of the old asphalt according to screening results, wherein the specific aggregate set is the same as the old asphalt, determining the asphalt-asphalt ratio according to extracted asphalt, and the asphalt-asphalt ratio of the new asphalt mixture is also the same.
S4, weighing 1000g of new asphalt and new aggregate according to the extraction result, using new asphalt mucilage, putting the new aggregate into an oven to be heated to 190 ℃ for later use, and putting the new asphalt into the oven to be heated to 160 ℃ for later use.
S5, setting the target temperature of the asphalt mixer to be 160 ℃, starting heating until the asphalt mixer reaches the target temperature, and pouring the old asphalt mixture, the new asphalt and the new aggregate into the asphalt mixer to be stirred for 200S.
And S6, taking out the reclaimed materials after the mixing is finished, putting the reclaimed materials into a Marshall compaction apparatus, manufacturing a Marshall standard test block, and detecting the road performance of the reclaimed asphalt mixture.
Experiments show that the method for regenerating the old asphalt mixture by microwave heating can fully heat and activate the old asphalt, save energy, control heating temperature and time, effectively prevent secondary aging of the asphalt, and highlight the advantages of the microwave heating regenerated asphalt as shown in the following table, wherein the dynamic stability of the obtained asphalt regenerated material is higher than that of the common regenerated asphalt.
As can be seen from the above table, the dynamic stability of the microwave recycled asphalt mixture is higher than that of the ordinary hot recycled old asphalt mixture.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A regeneration method for microwave heating activation of old asphalt mixture is characterized by comprising the following steps: the method comprises the following steps:
s1, grading, screening and classifying the milled old asphalt mixture;
s2, fully mixing the old asphalt mixture with graphite powder, wherein the adding amount of the graphite powder is calculated according to the following formula:
in the formula: x is the adding amount of graphite powder;
M 1 the quality of the old asphalt mixture with certain particle size;
s3, respectively heating and activating the graded and screened old asphalt mixture under different microwave conditions, adding the new and old asphalt mixture according to a specified sequence in the mixing process, heating and stirring, and obtaining a regenerated asphalt mixture after the completion;
screening the milled old asphalt mixture according to three types of preparation ranges of more than 9.5mm, 2.36-9.5 mm and less than 2.36 mm; old asphalt mixture larger than 9.5mm
0.35 to 0.4; old asphalt mixture of 2.36 to 9.5mm
0.3 to 0.35; waste asphalt mixture of less than 2.36mm
0.2 to 0.3;
paving the old asphalt mixture with the thickness of 25mm and the microwave heating power of 4kW, wherein the paving thickness is more than 9.5mm, the microwave frequency is 3000MHz, and the heating time is 100s; paving 20mm of old asphalt mixture of 2.36-9.5 mm, wherein the paving thickness is 4kW, the microwave heating power is 2500MHz, and the heating time is 90s; 15mm of old asphalt mixture with the thickness of paving, 3kW of microwave heating power, 2500MHz of microwave frequency and 80s of heating time;
the specification of graphite powder of the old asphalt mixture with the diameter larger than 9.5mm is 500 meshes, the specification of graphite powder of the old asphalt mixture with the diameter of 2.36-9.5 mm is 300 meshes, and the specification of graphite powder of the old asphalt mixture with the diameter smaller than 2.36mm is 200 meshes.
2. The regeneration method for microwave heating activation of the old asphalt mixture as claimed in claim 1, wherein the graphite powder has an electrical resistivity of 8.0 μ Ω m, a thermal conductivity of 140W/mK, and a bulk density of 1.75g/cm 3 Coefficient of thermal expansion of 2.4X 10 -6 /℃。
3. The regeneration method for microwave heating activation of the old asphalt mixture according to claim 1 or 2, characterized in that the old asphalt mixture with the diameter of more than 9.5mm, the new asphalt and the new aggregate are poured into an asphalt mixing machine and stirred for 80s, then the old asphalt mixture with the diameter of 2.36 to 9.5mm is added and stirred for 30s, and finally the old asphalt mixture with the diameter of less than 2.36mm is added and stirred for 90s.
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| CN108623201A (en) * | 2018-08-16 | 2018-10-09 | 桂勘 | A kind of preparation method of large scale regenerating waste asphalt mixture |
| CN109987882A (en) * | 2019-04-19 | 2019-07-09 | 福建南方路面机械有限公司 | A kind of RAP regenerates production method entirely |
| CN110204252A (en) * | 2019-05-10 | 2019-09-06 | 扬州大学 | Reclaimed asphalt mixture preparation method |
| CN111154276A (en) * | 2020-01-15 | 2020-05-15 | 苏交科集团股份有限公司 | Microwave-assisted regeneration material and preparation method thereof |
| CN112142369A (en) * | 2020-08-27 | 2020-12-29 | 江苏现代路桥有限责任公司 | Production process of recycled asphalt mixture |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105601176A (en) * | 2015-12-21 | 2016-05-25 | 安徽省交通规划设计研究总院股份有限公司 | Production method of plant-mixed hot recycled asphalt concrete |
| CN108623201A (en) * | 2018-08-16 | 2018-10-09 | 桂勘 | A kind of preparation method of large scale regenerating waste asphalt mixture |
| CN109987882A (en) * | 2019-04-19 | 2019-07-09 | 福建南方路面机械有限公司 | A kind of RAP regenerates production method entirely |
| CN110204252A (en) * | 2019-05-10 | 2019-09-06 | 扬州大学 | Reclaimed asphalt mixture preparation method |
| CN111154276A (en) * | 2020-01-15 | 2020-05-15 | 苏交科集团股份有限公司 | Microwave-assisted regeneration material and preparation method thereof |
| CN112142369A (en) * | 2020-08-27 | 2020-12-29 | 江苏现代路桥有限责任公司 | Production process of recycled asphalt mixture |
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