CN113668328A - Processing method for realizing large-mixing-amount high-quality recycling of RAP - Google Patents
Processing method for realizing large-mixing-amount high-quality recycling of RAP Download PDFInfo
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- CN113668328A CN113668328A CN202111010498.6A CN202111010498A CN113668328A CN 113668328 A CN113668328 A CN 113668328A CN 202111010498 A CN202111010498 A CN 202111010498A CN 113668328 A CN113668328 A CN 113668328A
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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
- E01C19/05—Crushing, pulverising or disintegrating apparatus; Aggregate screening, cleaning, drying or heating apparatus; Dust-collecting arrangements specially adapted therefor
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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
- 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
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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
Abstract
The invention discloses a processing method for realizing large-doping-amount high-quality recycling of RAP, which comprises the following steps of: s1, setting the control standard of RAP in the recycled asphalt utilization mixture; s2, milling and recovering the old pavement, and uniformly primarily screening the milled and recovered RAP; s3, crushing and shaping the RAP after primary screening; s4, classifying and screening the crushed and shaped RAPs, and classifying and selecting RAPs meeting the instruction standard in the step S1; and S5, performing plant mixing heat recycling on the selected RAP. The invention provides a processing method for realizing large-doping-amount high-quality recycling of RAP, which optimizes a pretreatment process of RAP, and comprises the steps of firstly carrying out primary screening on RAP, then crushing RAP on a screen and screening in grades until the treated RAP meets the controllable use requirement of large doping amount, obviously improving the efficiency and quality of standardized treatment and reducing RAP variability.
Description
Technical Field
The invention relates to the technical field of road engineering materials, in particular to a processing method for realizing large-doping-amount high-quality recycling of RAP.
Background
In recent years, the development of domestic expressways is rapid, the total mileage of expressways in China is over 16 kilometers, the mileage of expressways built in Fujian province is over 6000 kilometers, expressways enter a large-area maintenance period in the coming years, and asphalt pavement maintenance projects generate a great amount of old road asphalt mixture every year, and if the old road asphalt mixture is not recycled, the stacking of a great amount of old road asphalt mixture causes great pressure on land occupation and environment. In the plant-mixed recycled asphalt mixture with the performance meeting the requirements at the current process level, the RAP utilization rate is generally only 20-40%, and the economy of RAP recycling is limited, so that the enthusiasm of technical popularization and application is low. In 8 months in 2019, the new edition of technical Specification for regenerating asphalt pavements (JTG/T5521 and 2019) promulgates that the plant-mixed hot recycling doping amount of the asphalt pavements is not more than 30 percent, the technical index requirement that the needle penetration of the old asphalt is not less than 20(0.01mm) is reduced, but no practical and feasible process method is available for really realizing large doping amount (more than 40 percent) and utilizing the old asphalt mixture with high quality, related technical achievements are still explored, and the high-value and high-performance recycling of the old asphalt mixture can reduce waste and protect the environment, has considerable economic benefits and is a necessary way for sustainable development in the field of asphalt pavement maintenance in the future.
At present, regarding the utilization of the recycled asphalt mixture, most scholars think that the variability of the RAP in the use process can be effectively reduced by strictly controlling the RAP milling process and strengthening the fine management of the RAP, so that the recycled asphalt mixture with stable performance is obtained.
Disclosure of Invention
The invention provides a processing method for realizing large-doping-amount high-quality recycling of RAP, which optimizes a pretreatment process of RAP, and comprises the steps of firstly carrying out primary screening on RAP, then crushing RAP on a screen and screening in grades until the treated RAP meets the controllable use requirement of large doping amount, thereby obviously improving the efficiency and quality of standardized treatment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a processing method for realizing large-doping-amount high-quality recycling of RAP comprises the following steps:
s1, setting the control standard of RAP in the recycled asphalt utilization mixture;
s2, milling and recovering the old pavement, and uniformly primarily screening the milled and recovered RAP;
s3, crushing and shaping the RAP after primary screening;
s4, classifying and screening the crushed and shaped RAPs, and classifying and selecting RAPs meeting the instruction standard in the step S1;
and S5, performing plant mixing heat recycling on the selected RAP.
Preferably, the indication criteria in step S1 include RAP asphalt content, RAP proportion, RAP mineral composition fluctuation value.
Preferably, the control standard of the RAP asphalt content is set to be more than 4.75mm of particle size and not more than 3.0 percent.
Preferably, the proportion of the RAP is the proportion of real mineral aggregate passing through a screen hole after the RAP above the screen hole is treated by a combustion method or an extraction method, and the control standard of the proportion of the RAP is set to be not more than 20%.
Preferably, the RAP mineral aggregate grading fluctuation value is a fluctuation value of the passing rate of the RAP mineral aggregate under different sieve pores, and specifically, the fluctuation value of the passing rate of the RAP mineral aggregate under the sieve pore of 0.075mm is ± 2%, the fluctuation value of the passing rate of the RAP mineral aggregate under the sieve pore of not more than 2.36mm is ± 4%, and the fluctuation value of the passing rate of the RAP mineral aggregate under the sieve pore of not less than 4.75mm is ± 5%.
Preferably, in the step S2, the primary screening is to use a 10mm vibrating screen to extract more than 10mm RAP.
Preferably, the water content of RAP is not more than 3% during primary screening, crushing, shaping and rescreening.
After adopting the technical scheme, compared with the background technology, the invention has the following advantages:
1. the invention relates to a processing method for realizing large-doping-amount high-quality recycling of RAP, which optimizes a pretreatment process of RAP.
2. According to the processing method for realizing the large-mixing-amount high-quality recycling of RAP, RAP recycled by milling is uniformly stacked and then primarily screened, and then RAP materials are directly classified and applied, so that the management difficulty in the process of milling and recycling old materials is greatly reduced, and the field construction is facilitated.
3. The invention discloses a processing method for realizing large-mixing-amount high-quality recycling of RAP, which sets the control standard of RAP in a recycled asphalt utilization mixture through tests, creatively sets the RAP asphalt content, the RAP sub-diameter ratio and the RAP mineral aggregate grading fluctuation value, puts forward the quality control requirement on RAP, improves the RAP mixing amount, simultaneously prepares a recycled asphalt utilization mixture with stable performance, and puts forward a theoretical basis for large-scale popularization and application of RAP.
Drawings
FIG. 1 is a flow chart of the method steps of the present invention;
FIG. 2 is a graph showing the 4.75mm mesh passing rate of the mineral aggregate after combustion of RAPs with different particle sizes in example 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the apparatus or element of the present invention must have a specific orientation, and thus, should not be construed as limiting the present invention.
Examples
Referring to fig. 1, the present invention discloses a processing method for realizing large-doping-amount high-quality recycling of RAP, which includes the following steps:
s1, setting the control standard of RAP in the recycled asphalt utilization mixture;
s2, milling and recovering the old pavement, uniformly stacking the RAPs obtained by milling and recovering, uniformly performing primary screening by adopting a 10mm vibrating screen, and selecting RAPs with the size of more than 10 mm;
s3, crushing and shaping the RAP after primary screening, reducing the agglomeration of RAP coarse aggregates, playing a role in industrial disposal, and promoting the consistency of the performance of the old road materials;
s4, classifying and screening the crushed and shaped RAPs, and classifying and selecting RAPs meeting the instruction standard in the step S1;
in the grading and re-screening, screening grading sieve holes can be adjusted and arranged according to the RAP type and the practical situation of engineering application; and in the grading utilization link, the optimal grading sieve pore size is selected, only RAP larger than the optimal grading sieve pore size is recycled, the influence of RAP fine aggregate on the grading fluctuation of the regenerated asphalt mixture is reduced, and the stability of the performance of the regenerated asphalt mixture is further controlled.
And S5, performing plant mixing heat recycling on the selected RAP.
Wherein the water content of RAP is not more than 3% during primary screening, crushing, shaping and rescreening.
In step S1, the index criteria include RAP pitch content, RAP ratio, and RAP mineral aggregate gradation fluctuation value.
The control standard of the RAP asphalt content is set to be that the RAP asphalt content is not more than 3.0% above the particle diameter of 4.75 mm.
The RAP ratio is the ratio of the real mineral aggregate passing through the sieve pore after the RAP above the sieve pore is treated by a burning method or an extraction method, and the control standard of the RAP ratio is set to be not more than 20%.
The grade fluctuation value of the RAP mineral aggregate is the fluctuation value of the passing rate of the RAP under different sieve pores, and specifically, the grade fluctuation value of the RAP mineral aggregate comprises the fluctuation value of +/-2% of the passing rate of the RAP mineral aggregate in a sieve pore of 0.075mm, the fluctuation value of +/-4% of the passing rate of the RAP mineral aggregate in a sieve pore of not more than 2.36mm, and the fluctuation value of +/-5% of the passing rate of the RAP mineral aggregate in a sieve pore of not less than 4.75 mm.
Example 1:
the method comprises the following steps of carrying out asphalt content, water content and grading change detection by sampling a milling material of a typical AC-20 asphalt mixture of a surface layer in an old highway, wherein the average value of 5 groups of detection data of each index data is shown as the following table:
plus in the above table means that the rate of extracting the real grading sieve pore is greater than the corresponding rate of the RAP sieve pore.
RAP test data of the upper road section show that:
the screened RAP coarse aggregate (the particle size is more than 5mm) is mainly a large-particle-size mineral aggregate in various asphalt mixtures on the original road and a 'granule' structure adhered with asphalt mastic sand, and a small proportion of RAP coarse aggregate is 'granule' cohesive blocks of full fine aggregate; the RAP coarse aggregate has the characteristics of large total proportional content, mainly stone, low old asphalt content, easy air drying and water content reduction.
The screened RAP fine aggregate (the particle size is less than 5mm) comprises all small-particle-size mineral aggregates in various asphalt mixtures of the original pavement and a 'particle cluster' structure formed by mutually bonding all asphalt mucilage and asphalt mortar; the accurate evaluation of RAP grading has larger influence, contains aged asphalt with higher proportion, has strong moisture absorption and retention capacity, and increases the difficulty of quality control and improvement of regenerated asphalt mixture.
Example 2:
selecting RAP aggregate milled in a certain base, dividing RAP into particle size specifications of 0-5mm, 5-6mm, 6-7mm, 7-8mm, 8-9mm, 9-10mm, 10-12mm, 12-16mm and more than 16mm by adopting a non-standard sieve, testing the asphalt content of RAP with different particle size specifications by a combustion method, and sieving mineral aggregate after RAP combustion, wherein the test result is shown in Table 3. As can be seen from Table 3, the content of old asphalt in the RAP coarse aggregate with the thickness of more than 5mm is obviously lower than that of RAP asphalt with the thickness of 0-5mm, and the proportion of the old asphalt in the regenerated asphalt mixture prepared by RAP with the thickness of more than 5mm in the total asphalt is not more than 30% by the amount of 50%, so that the regeneration difficulty of the aged old asphalt is greatly reduced, the binding material in the regenerated asphalt mixture is mainly added new asphalt, the performance of the regenerated asphalt mixture is dominated by adding the new asphalt, and the influence of the old asphalt on the performance of the regenerated asphalt mixture is reduced. The contents of RAP asphalt with different particle diameters and the passing rate of the mineral aggregate after combustion are shown in the following table:
according to the table, the proportion of RAPs with different particle diameters is shown in the table, the proportion of 12-16 mmRAPs in RAPs stacked in the base is the largest and reaches 32.9%, the proportion of 7-8 mmRAPs is the smallest and is only 0.6%, the proportion of more than 7 mmRAPs is 65.6%, and the coarse RAP aggregates mainly comprise stone materials, so that the requirements of performance meeting can be realized through proper weight grading design, and the quantity requirement of single-grade high-dosage recycling can be met.
In addition, the RAP coarse aggregate has a large specific surface area, is easy to quickly air-dry and reduce the water content, can naturally reduce the adverse effect of the moisture with the maximum specific heat in the RAP on the temperature control in the mixing process of the regenerated asphalt mixture, reduces the heating consumption of the RAP, and reduces the heating temperature of the new aggregate to a certain extent.
In conclusion, the technical characteristics of the RAP coarse aggregate have relatively positive effect on the hot recycling of the plant mixture, and the RAP fine aggregate is easier to realize stable and accurate control on the aspects of asphalt, gradation and temperature.
Example 3:
as the instability of the performance of the regenerated asphalt mixture mainly comes from the difficulty in controlling the variation of the RAP performance, particularly the grading variation of the RAP is large, in order to further understand the condition that the RAP with different particle size specifications wraps the fine aggregates, the condition of 4.75mm passing rate of the mineral aggregate after the RAP with different particle size specifications of the base is combusted is studied, the research result is shown in figure 2, the RAP4.75mm sieve mesh passing rate with the particle size of more than 7mm is within 30%, the RAP4.75mm sieve mesh passing rate of each grade basically shows a reduction trend along with the increase of the particle size of the RAP, the larger the particle size of the RAP is, the smaller the amount of the wrapped fine aggregates is, but the condition that the 4.75mm sieve mesh passing rate is larger than 9-10mm is caused by 10-12mm and 12-16mm RAP, and the condition that the small particle size aggregates are more in 10-12mm and 12-16mm RAP is demonstrated.
In order to obtain a recycled asphalt mixture with stable performance, the grading variability of RAP needs to be controlled, and in this embodiment, a parameter of the proportion of the rare earth metals is innovatively proposed, which is defined as that after RAP above a certain screen hole is treated by a combustion method or an extraction method, the material of the obtained real mineral aggregate passing through the graded screen hole is the rare earth metals of the rare earth metals, the proportion of the rare earth metals is a ratio of the rare earth metals, and the control standard of the ratio of the rare earth metals is set to be not more than 20%.
Example 4:
if the fluctuation of the RAP mineral aggregate is too large, the fluctuation of the mineral aggregate gradation of the recycled asphalt mixture is directly caused to be not qualified, the variation coefficient of the fluctuation values of the RAP mineral aggregate with different particle diameters of the base is calculated, and the result is shown in the following table:
as can be seen from the above table, the variation coefficient of the passing rate of the mineral aggregates with 12-16mm and more than 16mm RAP in the sieve pores of 0.075-0.3mm and 0.3-13.2mm is more than 10%, and the variation coefficient of the passing rate of the mineral aggregates with other particle size RAP in each sieve pore is less than 10%.
Therefore, the variability of RAP mineral aggregate gradation is reduced through a pretreatment process, and an index control standard is determined for the fluctuation value of the RAP mineral aggregate after the standardized treatment. Specifically, the control standard comprises that the fluctuation value of the RAP in the passing rate of a 0.075mm sieve pore is +/-2%, the fluctuation value of the RAP in the passing rate of no more than 2.36mm sieve pore is +/-4%, and the fluctuation value of the RAP in the passing rate of no less than 4.75mm sieve pore is +/-5%.
In summary, in order to obtain a high-mixing-amount RAP reclaimed asphalt mixture with stable performance, the index standards for the standardized RAP asphalt content, the ratio of the coarse aggregate and the RAP mineral aggregate gradation fluctuation value are provided as shown in the following table:
the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A processing method for realizing large-doping-amount high-quality recycling of RAP is characterized by comprising the following steps:
s1, setting the control standard of RAP in the recycled asphalt utilization mixture;
s2, milling and recovering the old pavement, and uniformly primarily screening the milled and recovered RAP;
s3, crushing and shaping the RAP after primary screening;
s4, classifying and screening the crushed and shaped RAPs, and classifying and selecting RAPs meeting the instruction standard in the step S1;
and S5, performing plant mixing heat recycling on the selected RAP.
2. The processing method for realizing large-mixing high-quality recycling of RAP according to claim 1, characterized in that: in step S1, the index control criteria include RAP pitch content, RAP ratio, and RAP mineral aggregate gradation fluctuation value.
3. The processing method for realizing large-mixing-amount high-quality recycling of RAP according to claim 2, characterized in that: the control standard of the RAP asphalt content is set to be that the RAP asphalt content is not more than 3.0% above the particle size of 4.75 mm.
4. The processing method for realizing large-mixing-amount high-quality recycling of RAP according to claim 2, characterized in that: the proportion of the RAP is the proportion of real mineral aggregate passing through the sieve pores after the RAP above the sieve pores is treated by a combustion method or an extraction method, and the control standard of the proportion of the RAP is set to be not more than 20%.
5. The processing method for realizing large-mixing-amount high-quality recycling of RAP according to claim 2, characterized in that: the grade fluctuation value of the RAP mineral aggregate is the fluctuation value of the passing rate of the RAP mineral aggregate under different sieve pores, and specifically, the grade fluctuation value of the RAP mineral aggregate comprises the fluctuation value of +/-2% of the passing rate of the RAP mineral aggregate in a sieve pore of 0.075mm, the fluctuation value of +/-4% of the passing rate of the RAP mineral aggregate in a sieve pore of not more than 2.36mm, and the fluctuation value of +/-5% of the passing rate of the RAP mineral aggregate in a sieve pore of not less than 4.75 mm.
6. The processing method for realizing large-mixing high-quality recycling of RAP according to claim 1, characterized in that: in step S2, the primary screening specifically includes selecting RAP with a size of 10mm or more by using a 10mm vibrating screen.
7. The processing method for realizing large-mixing high-quality recycling of RAP according to claim 1, characterized in that: the water content of RAP is not more than 3% during primary screening, crushing, shaping and rescreening.
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