CN111499273A - Preparation method of hot recycled asphalt mixture - Google Patents
Preparation method of hot recycled asphalt mixture Download PDFInfo
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- CN111499273A CN111499273A CN202010346083.5A CN202010346083A CN111499273A CN 111499273 A CN111499273 A CN 111499273A CN 202010346083 A CN202010346083 A CN 202010346083A CN 111499273 A CN111499273 A CN 111499273A
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
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Abstract
The invention relates to the field of asphalt and discloses a preparation method of a thermal regeneration asphalt mixture, which comprises the steps of milling and crushing an aged asphalt pavement, crushing and screening recovered RAP to obtain recovered aggregate and storing the recovered aggregate; respectively detecting the asphalt content, the old asphalt performance and the mineral aggregate gradation of the reclaimed aggregate collected in the middle; determining the contents of the matrix asphalt, the new aggregate, the recovered aggregate, the mineral powder and the asbestos rag according to the detection result and the proportioning requirement of the mixture; adding the heated recycled aggregate and the new aggregate into a mixing device for stirring so as to mix the new aggregate and the old aggregate and carry out heat exchange, and adding a regenerant into the mixture during stirring for mixing; adding mineral powder, asbestos rag and heated matrix asphalt into mixing equipment and stirring the mixture with the new and old aggregate mixtures; and discharging and forming after stirring to obtain a finished asphalt mixture product. The invention provides a recycled asphalt mixture with high utilization rate of old materials and good physical and mechanical properties.
Description
Technical Field
The invention relates to the field of asphalt, in particular to a preparation method of a hot recycling asphalt mixture.
Background
In the use process of the asphalt pavement, the asphalt pavement can decay and age gradually due to the comprehensive action of meteorological environment and traffic load. Various diseases occur, and further the problems of maintenance and repair and generation of a large amount of waste asphalt mixtures are faced, and in order to solve the problems, an asphalt pavement thermal regeneration technology is provided. The heat regeneration technology is the most popular asphalt pavement regeneration method used in the world at present, and is a complete set of process of milling old asphalt concrete pavement materials, transporting the milled old asphalt concrete pavement materials back to a factory, mixing a certain amount of new aggregate, asphalt and a regenerant (if necessary) according to indexes such as asphalt content, asphalt aging degree, crushed stone grading and the like in the old materials to enable the mixture to reach various indexes of standard requirements, and re-paving the pavement according to the completely same method as that of a newly-built asphalt concrete pavement.
Compared with the traditional asphalt pavement maintenance mode, the asphalt pavement thermal regeneration technology can save a large amount of raw materials such as asphalt, gravel and the like, save engineering investment and is beneficial to treating waste materials and protecting the environment, so that the asphalt pavement thermal regeneration technology has remarkable economic benefit, social benefit and environmental benefit, and the asphalt pavement regeneration technology is more and more valued by people along with the attention of people on environmental protection and social benefit and the technical progress.
But the existing thermal regeneration asphalt has the problems of low utilization rate of old materials and poor physical and mechanical properties of the regenerated asphalt mixture.
Disclosure of Invention
Based on the technical problems, the invention provides a hot recycled asphalt mixture and a preparation method thereof, and provides a recycled asphalt mixture with high utilization rate of old materials and good physical and mechanical properties.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a hot recycling asphalt mixture comprises the following steps:
milling and crushing an aged asphalt pavement, and crushing and screening recovered RAP to obtain recovered aggregate and storing the recovered aggregate;
step two, respectively detecting the asphalt content, the old asphalt performance and the mineral aggregate gradation of the recycled aggregate collected in the step one;
determining the contents of the matrix asphalt, the new aggregate, the recycled aggregate, the mineral powder and the asbestos rag according to the detection result in the step two and the proportioning requirement of the mixture;
step four, adding the heated recycled aggregate and the new aggregate into mixing equipment for stirring so as to mix the new aggregate and the old aggregate and carry out heat exchange, and adding a regenerant into the mixture during stirring for stirring;
step five, adding the mineral powder, the asbestos rag and the heated matrix asphalt into mixing equipment and mixing with the new and old aggregate mixture in the step four;
and sixthly, discharging and forming after stirring to obtain a finished asphalt mixture product.
As a preferable mode, the components account for 4-5 percent of matrix asphalt, 50-70 percent of new aggregate, 20-40 percent of recycled aggregate, 2-5 percent of mineral powder and 2-3 percent of asbestos rag by mass, and the total mass of the components meets 100 percent.
As a preferable mode, the new aggregate is divided into five grades with the grain size of 0-3mm, 3-5mm, 5-10mm, 10-20mm and 20-30 mm.
As a preferable mode, the recycled aggregate is divided into two grades of 0-10mm and 10-20mm in size.
In a preferred mode, the base asphalt is one of road petroleum asphalt AH-50, AH-70, AH-90, AH-110 and AH-130.
As a preferred mode, the heating temperature of the recovered aggregate is 90-110 ℃; the heating temperature of the new aggregate is 170-200 ℃; the heating temperature of the matrix asphalt is 150-170 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) the proportion of the recycled aggregate in the invention reaches 20-40%, which is 15-20% higher than the addition of the conventional recycled aggregate in the prior art, thus improving the utilization rate of the regenerated old aggregate. Thus saving a large amount of raw materials such as asphalt, gravel and the like, saving engineering investment, and being beneficial to treating waste materials and protecting the environment, thereby having remarkable economic benefit, social benefit and environmental benefit.
(2) The invention adds the asbestos rag to mix with the new and old aggregates, and forms the reinforcing rib in the hot recycled asphalt mixture by utilizing the fiber structure of the asbestos rag, thereby further improving the strength and the compressive resistance of the hot recycled asphalt mixture and leading the physical and mechanical properties of the hot recycled asphalt mixture to be better.
Drawings
FIG. 1 is a flow chart of a preparation method of a hot recycling asphalt mixture.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Referring to fig. 1, a method for preparing a hot recycled asphalt mixture includes the following steps:
milling and crushing an aged asphalt pavement, and crushing and screening recovered RAP to obtain recovered aggregate and storing the recovered aggregate;
step two, respectively detecting the asphalt content, the old asphalt performance and the mineral aggregate gradation of the recycled aggregate collected in the step one;
determining the contents of the matrix asphalt, the new aggregate, the recycled aggregate, the mineral powder and the asbestos rag according to the detection result in the step two and the proportioning requirement of the mixture;
step four, adding the heated recycled aggregate and the new aggregate into mixing equipment for stirring so as to mix the new aggregate and the old aggregate and carry out heat exchange, and adding a regenerant into the mixture during stirring for stirring;
step five, adding the mineral powder, the asbestos rag and the heated matrix asphalt into mixing equipment and mixing with the new and old aggregate mixture in the step four;
and sixthly, discharging and forming after stirring to obtain a finished asphalt mixture product.
Wherein, the mass percentages of the components are 4-5% of matrix asphalt, 50-70% of new aggregate, 20-40% of recycled aggregate, 2-5% of mineral powder and 2-3% of asbestos rag, and the total mass of the components meets 100%. The heating temperature of the recovered aggregate is 90-110 ℃; the heating temperature of the new aggregate is 170-200 ℃; the heating temperature of the matrix asphalt is 150-170 ℃.
In the above preparation method, the performance and the content of the aged asphalt in the RAP material in each grade can be obtained through an extraction test, the gradation of the mineral aggregate in the RAP material in each grade can be obtained through a screening test, and the blending proportion of the RAP material in the hot recycled asphalt mixture can be determined through the gradation of the mineral aggregate in the RAP material.
The aggregate is a generic term for mineral aggregate in bituminous pavement materials, and plays a skeleton role and a filling role in the pavement materials. Sometimes, a plurality of coarse and fine aggregates are required to be mixed to form the required grain size gradation, preferably, the new aggregates are divided into five grades with the grain sizes of 0-3mm, 3-5mm, 5-10mm, 10-20mm and 20-30mm, and the recovered aggregates are divided into two grades with the grain sizes of 0-10mm and 10-20mm, so that the proper new and old aggregates are conveniently selected for proportioning.
The specific dosage of the components can be synthesized by gradation according to the requirements of 'design code of asphalt pavement of roads'.
Example 1:
referring to fig. 1, taking AC-20 graded asphalt concrete as an example, the components account for 4.3% of matrix asphalt, 60% of new aggregate, 30% of recycled aggregate, 3% of mineral powder and 2.7% of asbestos cloth by mass percent, and the finished product of the asphalt mixture is prepared according to the preparation method of the thermal regeneration asphalt mixture.
In the embodiment, the proportion of the recycled aggregate reaches 30 percent, which is 15 to 20 percent higher than the addition of the conventional recycled aggregate in the prior art, and the utilization rate of the recycled old aggregate is improved. Thus saving a large amount of raw materials such as asphalt, gravel and the like, saving engineering investment, and being beneficial to treating waste materials and protecting the environment, thereby having remarkable economic benefit, social benefit and environmental benefit. Meanwhile, the asbestos rag is added and mixed with the new and old aggregates, and the fiber structure of the asbestos rag is utilized to form the reinforcing ribs in the hot recycled asphalt mixture, so that the strength and the pressure resistance of the hot recycled asphalt mixture can be further improved, and the physical and mechanical properties of the hot recycled asphalt mixture are better.
The above is an embodiment of the present invention. The embodiments and specific parameters in the embodiments are only used for clearly illustrating the verification process of the invention and are not used for limiting the patent protection scope of the invention, which is defined by the claims, and all the equivalent structural changes made by using the contents of the description and the drawings of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The preparation method of the hot recycling asphalt mixture is characterized by comprising the following steps:
milling and crushing an aged asphalt pavement, and crushing and screening recovered RAP to obtain recovered aggregate and storing the recovered aggregate;
step two, respectively detecting the asphalt content, the old asphalt performance and the mineral aggregate gradation of the recycled aggregate collected in the step one;
determining the contents of the matrix asphalt, the new aggregate, the recycled aggregate, the mineral powder and the asbestos rag according to the detection result in the step two and the proportioning requirement of the mixture;
step four, adding the heated recycled aggregate and the new aggregate into mixing equipment for stirring so as to mix the new aggregate and the old aggregate and carry out heat exchange, and adding a regenerant into the mixture during stirring for stirring;
step five, adding the mineral powder, the asbestos rag and the heated matrix asphalt into mixing equipment and mixing with the new and old aggregate mixture in the step four;
and sixthly, discharging and forming after stirring to obtain a finished asphalt mixture product.
2. A hot recycled asphalt mix as defined in claim 1, wherein: the components account for 4-5 percent of matrix asphalt, 50-70 percent of new aggregate, 20-40 percent of recycled aggregate, 2-5 percent of mineral powder and 2-3 percent of asbestos rag by mass percent, and the total mass of the components meets 100 percent.
3. A hot recycled asphalt mix as defined in claim 2, wherein: the new aggregate is divided into five grades with the grain size of 0-3mm, 3-5mm, 5-10mm, 10-20mm and 20-30 mm.
4. A hot recycled asphalt mix as defined in claim 2, wherein: the recycled aggregate is divided into two grades with the grain size of 0-10mm and 10-20 mm.
5. A hot recycled asphalt mix as defined in claim 2, wherein: the matrix asphalt is one of road petroleum asphalt AH-50, AH-70, AH-90, AH-110 and AH-130.
6. The method for preparing hot recycled asphalt according to claim 1, wherein: the heating temperature of the recovered aggregate is 90-110 ℃; the heating temperature of the new aggregate is 170-200 ℃; the heating temperature of the matrix asphalt is 150-170 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010346083.5A CN111499273A (en) | 2020-04-27 | 2020-04-27 | Preparation method of hot recycled asphalt mixture |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010346083.5A CN111499273A (en) | 2020-04-27 | 2020-04-27 | Preparation method of hot recycled asphalt mixture |
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| CN111499273A true CN111499273A (en) | 2020-08-07 |
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| CN202010346083.5A Pending CN111499273A (en) | 2020-04-27 | 2020-04-27 | Preparation method of hot recycled asphalt mixture |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112982088A (en) * | 2021-02-25 | 2021-06-18 | 山东高速建设管理集团有限公司 | Heating and mixing process for regenerated asphalt mixture and mixing station thereof |
| CN113338105A (en) * | 2021-06-12 | 2021-09-03 | 河南金欧特实业集团股份有限公司 | High-quality normal-temperature solvent type asphalt and preparation method thereof |
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| RU2006147363A (en) * | 2006-12-29 | 2008-07-10 | Александр Юрьевич Дедюхин (RU) | METHOD FOR REINFORCING ASPHALT CONCRETE MIX |
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2020
- 2020-04-27 CN CN202010346083.5A patent/CN111499273A/en active Pending
Patent Citations (6)
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| RU2006147363A (en) * | 2006-12-29 | 2008-07-10 | Александр Юрьевич Дедюхин (RU) | METHOD FOR REINFORCING ASPHALT CONCRETE MIX |
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Non-Patent Citations (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112982088A (en) * | 2021-02-25 | 2021-06-18 | 山东高速建设管理集团有限公司 | Heating and mixing process for regenerated asphalt mixture and mixing station thereof |
| CN113338105A (en) * | 2021-06-12 | 2021-09-03 | 河南金欧特实业集团股份有限公司 | High-quality normal-temperature solvent type asphalt and preparation method thereof |
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Application publication date: 20200807 |
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