CN111851225B - Construction method for regenerating old asphalt pavement - Google Patents
Construction method for regenerating old asphalt pavement Download PDFInfo
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- CN111851225B CN111851225B CN202010641985.1A CN202010641985A CN111851225B CN 111851225 B CN111851225 B CN 111851225B CN 202010641985 A CN202010641985 A CN 202010641985A CN 111851225 B CN111851225 B CN 111851225B
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- old
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- asphalt pavement
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/065—Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/12—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/14—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces for heating or drying foundation, paving, or materials thereon, e.g. paint
Abstract
The invention discloses a construction method for regenerating an old asphalt pavement, which comprises the following steps: 1) heating and softening the old asphalt pavement by heating equipment, milling and loosening to obtain an old mixture; 2) sampling the old mixture, performing centrifugal separation, measuring aggregate gradation of the old mixture, and determining new mineral aggregate; 3) extracting an old mixture sample, measuring the content of asphalt, and determining new asphalt; 4) spraying a regenerant on the surface of the old mixture; 5) conveying the old mixture to a regeneration device, adding new mineral aggregate into the regeneration device, stirring, adding a reinforcing agent into the regeneration device, stirring until the mixture is uniform, wherein the reinforcing agent comprises polyphenyl ether and carbon fiber in a weight ratio of 1:1-1.5, adding new asphalt into the regeneration device, and stirring; 6) spreading, tamping, ironing and rolling to form a new asphalt pavement again. The invention can obtain a new asphalt pavement with better high-temperature stability, low-temperature crack resistance, durability, smoothness and smoothness.
Description
Technical Field
The invention relates to the technical field of asphalt pavement regeneration. More specifically, the invention relates to a construction method for regenerating an old asphalt pavement.
Background
The asphalt pavement regenerating technology is a set of technological process in which the old asphalt pavement to be renovated is dug, recovered, crushed and screened, and then mixed with regenerant, new asphalt material, new aggregate and the like according to a certain proportion to obtain a regenerated asphalt mixture meeting a certain pavement performance, and the mixture is used for paving the pavement again. The pavement regeneration can not only satisfy the pavement performance requirement again, save a large amount of material resources and funds, reduce the construction cost, but also avoid the pollution of waste materials to the environment, realize industrial recycling economy and promote the ecological environment protection, is a specific practice for implementing strategic measures of 'conservation-minded society' and has very remarkable social and economic benefits.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
It is still another object of the present invention to provide a recycling construction method of an old asphalt pavement, which can obtain a new asphalt pavement having superior high-temperature stability, low-temperature crack resistance, durability, skid resistance and smoothness.
To achieve these objects and other advantages in accordance with the present invention, there is provided an old asphalt pavement recycling construction method including:
1) heating and softening the old asphalt pavement by heating equipment, milling to a certain depth, and loosening the old asphalt pavement to obtain an old mixture;
2) sampling the old mixture, performing centrifugal separation, measuring the aggregate gradation of the old mixture, and determining the type and the addition amount of new mineral aggregate to enable the new mineral aggregate to meet the gradation specification requirement;
3) extracting an old mixture sample, measuring the asphalt content, physical indexes and chemical components, and determining the type and the addition amount of new asphalt by combining the addition amount of new mineral aggregate so as to enable the new asphalt to meet the performance requirement of the mixture;
4) spraying a regenerant on the surface of the old mixture, wherein the dosage of the regenerant is 5-8% of the weight of the old mixture, and the regenerant comprises the following raw materials in percentage by weight: 10-15% of gasoline product obtained by catalytic cracking of heavy oil containing C15-C18 alkane, 6-8% of terpene resin, 15-20% of aromatic oil, 0.5-2% of dibutyl phthalate, and the balance of heavy oil containing C15-C18 alkane;
5) conveying the old mixture to a regeneration device, adding new mineral aggregate into the regeneration device, stirring, adding a reinforcing agent into the regeneration device, wherein the using amount of the reinforcing agent is 1-3% of the total weight of the old mixture and the new mineral aggregate, stirring to be uniform, the reinforcing agent comprises polyphenyl ether and carbon fiber in a weight ratio of 1:1-1.5, adding new asphalt into the regeneration device, and stirring;
6) spreading, tamping, ironing and rolling to form a new asphalt pavement again.
Preferably, the construction method is implemented by adopting an asphalt pavement thermal regeneration combined unit, and the asphalt pavement thermal regeneration combined unit comprises heating equipment, a dump truck, regeneration equipment and a road roller.
Preferably, the method for spraying the regenerant on the surface of the old mixture in the step 4) is as follows: wetting the surface, standing for 5-10min, wetting the surface again, and repeating for 3-4 times.
Preferably, the paving process of step 6) sprays the quaternary ammonium salt type cationic surfactant to the pavement.
Preferably, standing and curing are carried out for 24 hours after the rolling in the step 6) is finished.
Preferably, the anti-rutting agent is also added when the new asphalt is added into the regeneration equipment in the step 5), and the dosage of the anti-rutting agent is 0.5 percent of the total weight of the old mixture and the new mineral aggregate.
The invention at least comprises the following beneficial effects:
the construction method of the invention can obtain a new asphalt pavement with better high-temperature stability, low-temperature crack resistance, durability, smoothness and smoothness, not only saves resources, but also promotes the construction of green modern society in China and is beneficial to environmental protection in China.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is further described in detail below with reference to examples to enable those skilled in the art to practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can, for example, be fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The terms "transverse," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used for the purpose of describing the invention only and are not intended to indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and are not to be considered as limiting the invention.
< example 1>
The construction method for regenerating the old asphalt pavement adopts an asphalt pavement thermal regeneration combined unit which comprises heating equipment, a dump truck, regeneration equipment and a road roller, and the construction method comprises the following steps:
1) heating and softening the old asphalt pavement by heating equipment, milling to a certain depth, and loosening the old asphalt pavement to obtain an old mixture;
2) sampling the old mixture, performing centrifugal separation, measuring the aggregate gradation of the old mixture, and determining the type and the addition amount of new mineral aggregate to enable the new mineral aggregate to meet the gradation specification requirement;
3) extracting an old mixture sample, measuring the asphalt content, physical indexes and chemical components, and determining the type and the addition amount of new asphalt by combining the addition amount of new mineral aggregate so as to enable the new asphalt to meet the performance requirement of the mixture;
4) spraying a regenerant on the surface of the old mixture, wherein the dosage of the regenerant is 6% of the weight of the old mixture, firstly wetting the surface, then standing for 8min, wetting the surface again, and repeating for 3 times, wherein the regenerant comprises the following raw materials in parts by weight: 12% of gasoline product obtained by catalytic cracking of heavy oil containing C15-C18 alkane, 6% of terpene resin, 20% of aromatic oil, 1% of dibutyl phthalate and the balance of heavy oil containing C15-C18 alkane;
5) conveying the old mixture to a regeneration device, adding new mineral aggregate into the regeneration device, stirring, adding a reinforcing agent into the regeneration device, wherein the using amount of the reinforcing agent is 1% of the total weight of the old mixture and the new mineral aggregate, stirring to be uniform, the reinforcing agent comprises polyphenyl ether and carbon fiber in a weight ratio of 1:1, adding new asphalt into the regeneration device, and adding an anti-rutting agent, the using amount of the anti-rutting agent is 0.5% of the total weight of the old mixture and the new mineral aggregate, and stirring;
6) spreading, tamping, ironing and rolling, spraying a quaternary ammonium salt cationic surfactant to the road surface in the spreading process, standing and maintaining for 24 hours after rolling is finished, and forming a new asphalt road surface again.
The construction method of example 1 is adopted for regenerating the old asphalt pavement in the Wancun connection line engineering (first-level highway) of the Jinshi high-speed highway. And (3) evaluating the structural bearing capacity of the new asphalt pavement by adopting the rebound deflection value, and measuring by using an automatic deflection instrument to obtain the rebound deflection value of 28.12, so that the requirement is met, and the project is qualified. And evaluating the anti-skid capability of the new asphalt pavement by adopting a lateral force coefficient, wherein the lateral force coefficient obtained by measuring by a deflecting wheel trailer method is more than 60, and the evaluation of the project is qualified. And evaluating the flatness of the new asphalt pavement by adopting the average value of the flatness of each section in the evaluation road section, wherein the average value of the flatness obtained by measuring with a continuous flatness meter is less than 2mm, the evaluation is qualified.
< comparative example 1>
The construction method for regenerating the old asphalt pavement is the same as the example 1, except that the regenerant used in the step 4) is lubricating oil.
< comparative example 2>
The construction method for regenerating the old asphalt pavement is the same as the example 1, except that no new mineral aggregate and reinforcing agent are added in the step 5).
< comparative example 3>
The construction method for recycling the old asphalt pavement is the same as the example 1, except that no reinforcing agent is added in the step 5).
< Low temperature crack resistance test >
And (3) adopting a low-temperature bending failure test of road engineering asphalt and asphalt mixture test procedures, calculating the bending-tensile strength and the maximum bending-tensile strain during failure by measuring the maximum failure load and the mid-span deflection corresponding to the maximum load, and evaluating the low-temperature crack resistance. The new mixes prepared in step 5) of example 1 and comparative examples 2 to 3 were subjected to a low temperature cracking test, the test results being shown in table 1.
TABLE 1
| Flexural tensile strength/MPa | Maximum bending strain/. mu.epsilon | |
| Example 1 | 10.9 | 4809 |
| Comparative example 2 | 7.5 | 3014 |
| Comparative example 3 | 9.6 | 4238 |
The novel mineral aggregate is added, so that the porosity of the mixture can be reduced, the gradation is dense, the low-temperature performance is facilitated, the reinforcing agent is added on the basis, the damage to materials with different sizes can be reduced, the framework structure is ensured, the strength of the mixture is improved, the good low-temperature performance is achieved in an indoor test, and the novel mineral aggregate can be used on site for a long time to avoid cracks.
< high temperature stability test >
And evaluating the high-temperature stability by adopting an rut test index. Test method T0719. The new mixes prepared in step 5) of example 1 and comparative example 1 were subjected to a low temperature cracking test, the test results being shown in table 2.
TABLE 2
| Degree of dynamic stability | |
| Example 1 | ≥6500 |
| Comparative example 1 | ≥4000 |
It can be seen that the regenerant with a specific formula is added, and the regenerant is uniformly combined with a framework formed by an old mixed material through a swelling effect to form a net-shaped cross-linking structure, so that the viscosity of the old asphalt material is reduced, the old asphalt material has better rheological property, and the high-temperature stability is achieved.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the examples shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (4)
1. The construction method for recycling the old asphalt pavement is characterized by comprising the following steps:
1) heating and softening the old asphalt pavement by heating equipment, milling to a certain depth, and loosening the old asphalt pavement to obtain an old mixture;
2) sampling the old mixture, performing centrifugal separation, measuring the aggregate gradation of the old mixture, and determining the type and the addition amount of new mineral aggregate to enable the new mineral aggregate to meet the gradation specification requirement;
3) extracting an old mixture sample, measuring the asphalt content, physical indexes and chemical components, and determining the type and the addition amount of new asphalt by combining the addition amount of new mineral aggregate so as to enable the new asphalt to meet the performance requirement of the mixture;
4) spraying a regenerant on the surface of the old mixture, wherein the dosage of the regenerant is 5-8% of the weight of the old mixture, and the regenerant comprises the following raw materials in percentage by weight: 10-15% of gasoline product obtained by catalytic cracking of heavy oil containing C15-C18 alkane, 6-8% of terpene resin, 15-20% of aromatic oil, 0.5-2% of dibutyl phthalate, and the balance of heavy oil containing C15-C18 alkane;
5) conveying the old mixture to a regeneration device, adding new mineral aggregate into the regeneration device, stirring, adding a reinforcing agent into the regeneration device, wherein the using amount of the reinforcing agent is 1-3% of the total weight of the old mixture and the new mineral aggregate, stirring to be uniform, the reinforcing agent comprises polyphenyl ether and carbon fiber in a weight ratio of 1:1-1.5, adding new asphalt into the regeneration device, and stirring;
6) spreading, tamping, ironing and rolling to form a new asphalt pavement again;
the construction method is implemented by adopting an asphalt pavement thermal regeneration combined unit, wherein the asphalt pavement thermal regeneration combined unit comprises heating equipment, a dump truck, regeneration equipment and a road roller;
step 4) the mode of spraying the regenerant on the surface of the old mixture is as follows: wetting the surface, standing for 5-10min, wetting the surface again, and repeating for 3-4 times.
2. The construction method for recycling an old asphalt pavement according to claim 1, wherein the quaternary ammonium salt type cationic surfactant is sprayed on the pavement in the spreading process of step 6).
3. The construction method for recycling the old asphalt pavement according to claim 1, wherein the step 6) is static curing for 24 hours after rolling.
4. The construction method for recycling the old asphalt pavement according to claim 1, wherein the anti-rutting agent is added when the new asphalt is added into the recycling equipment in the step 5), and the dosage of the anti-rutting agent is 0.5 percent of the total weight of the old mixture and the new mineral aggregate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010641985.1A CN111851225B (en) | 2020-07-06 | 2020-07-06 | Construction method for regenerating old asphalt pavement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010641985.1A CN111851225B (en) | 2020-07-06 | 2020-07-06 | Construction method for regenerating old asphalt pavement |
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| CN111851225A CN111851225A (en) | 2020-10-30 |
| CN111851225B true CN111851225B (en) | 2021-12-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112853866A (en) * | 2021-01-13 | 2021-05-28 | 陕西中霖集团工程设计研究有限公司 | Thermal regeneration method for asphalt pavement |
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| CN102505600A (en) * | 2011-10-28 | 2012-06-20 | 江阴泰富沥青有限公司 | On-site construction method of cold recycling asphalt pavement |
| CN103013144A (en) * | 2012-12-24 | 2013-04-03 | 中交第一公路勘察设计研究院有限公司 | In-situ warm-mixing regenerant for bituminous pavement, preparation method and construction method of in-situ warm-mixing regenerant |
| CN103774537A (en) * | 2012-10-25 | 2014-05-07 | 中国石油化工股份有限公司 | Asphalt pavement regeneration method |
| CN104231640A (en) * | 2013-08-27 | 2014-12-24 | 武汉理工大学 | SBS (styrene-butadiene-styrene) modified asphalt regenerant and preparation method thereof |
| CN111304991A (en) * | 2020-03-17 | 2020-06-19 | 中路交建(北京)工程材料技术有限公司 | Hot plant mix recycling maintenance method for drainage asphalt pavement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63175123A (en) * | 1987-01-16 | 1988-07-19 | Isao Mochida | Pitch fiber |
| CN104610768B (en) * | 2015-01-26 | 2017-04-12 | 江苏苏博特新材料股份有限公司 | Asphalt regeneration agent as well as preparation method and application thereof |
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2020
- 2020-07-06 CN CN202010641985.1A patent/CN111851225B/en active Active
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| CN102505600A (en) * | 2011-10-28 | 2012-06-20 | 江阴泰富沥青有限公司 | On-site construction method of cold recycling asphalt pavement |
| CN103774537A (en) * | 2012-10-25 | 2014-05-07 | 中国石油化工股份有限公司 | Asphalt pavement regeneration method |
| CN103013144A (en) * | 2012-12-24 | 2013-04-03 | 中交第一公路勘察设计研究院有限公司 | In-situ warm-mixing regenerant for bituminous pavement, preparation method and construction method of in-situ warm-mixing regenerant |
| CN104231640A (en) * | 2013-08-27 | 2014-12-24 | 武汉理工大学 | SBS (styrene-butadiene-styrene) modified asphalt regenerant and preparation method thereof |
| CN111304991A (en) * | 2020-03-17 | 2020-06-19 | 中路交建(北京)工程材料技术有限公司 | Hot plant mix recycling maintenance method for drainage asphalt pavement |
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