CN113850303A - Method and system for classifying old asphalt pavement materials - Google Patents

Method and system for classifying old asphalt pavement materials Download PDF

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CN113850303A
CN113850303A CN202111043246.3A CN202111043246A CN113850303A CN 113850303 A CN113850303 A CN 113850303A CN 202111043246 A CN202111043246 A CN 202111043246A CN 113850303 A CN113850303 A CN 113850303A
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asphalt pavement
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old asphalt
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黄伯承
吴志刚
刘家辉
李世统
伍赵亮
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Fujian Expressway Group Co ltd
Fujian Expressway Maintenance Engineering Co ltd
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Abstract

The invention discloses a method and a system for classifying old asphalt pavement materials. The disclosed method comprises: after sampling, calculating the asphalt content in each sample, obtaining the mineral aggregate gradation in each sample, and measuring the recycled asphalt penetration of each sample; the grading similarity is adopted to characterize the mineral aggregate grading of each sample, and the relative similarity of the mineral aggregate grading of each sample is obtained; and taking the recycled asphalt penetration, the asphalt content and the mineral aggregate gradation similarity of each sample as clustering members, and carrying out clustering analysis through K-means to combine old asphalt pavement materials with similar asphalt penetration, asphalt content and mineral aggregate gradation in the old asphalt pavement materials from various sources into one class. The invention mills, deposits and uses the same kind of old asphalt pavement material sources together, can greatly reduce the variability of the asphalt content and mineral aggregate gradation of the regenerated asphalt mixture, and improves the stability of the quality.

Description

Method and system for classifying old asphalt pavement materials
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a method and a system for classifying old asphalt pavement materials.
Background
At present, the course of newly building high-grade bituminous pavements in China gradually decreases, and correspondingly, a large number of bituminous pavements built at the beginning of the century begin to enter major and intermediate repair periods, so that the requirements of China on the maintenance and the repair of the bituminous pavements are higher than the requirements on the construction of the newly built bituminous pavements in a period of time in the future. The large and medium repair of the asphalt pavement usually needs milling and planing the old asphalt pavement to remove the seriously damaged asphalt pavement and then re-paving the asphalt pavement with newly mixed asphalt mixture. Therefore, a huge amount of waste asphalt mixture is generated during the overhaul of the asphalt pavement. It is estimated that 1.6 million tons of waste asphalt mixture is produced in China every year.
Since 2015, China promulgated a more severe environmental protection policy, so that the exploitation amount and the supply amount of natural aggregates are greatly reduced, and the price of the aggregates is greatly increased. However, the waste asphalt mix contains not only a large amount of "black aggregate" but also a very considerable amount of asphalt. Therefore, the waste asphalt mixture is recycled to produce the recycled asphalt mixture, and the recycled asphalt mixture has high economic, social and environmental values.
However, the recycling rate of the old asphalt mixture in China is only about 30%, and the difference is very large compared with the 80% recycling rate of developed countries. The reason for this is that, after many years of use, the maintenance histories, the maintenance materials and the maintenance means of different road sections are different, and it is considered that the new road is built by different construction parties using different materials, so that even if the old asphalt pavement materials obtained from different road sections of the same road are different, the material characteristics are also greatly different. Once the mix ratio of the reclaimed asphalt is determined by a test, it is not preferable to greatly vary the mix ratio during construction. However, since the old asphalt mixture with the large difference in material properties is used, the asphalt content and the mineral aggregate gradation of the produced reclaimed asphalt mixture are in fluctuation, and the fluctuation often causes the reclaimed asphalt mixture to be unqualified.
Disclosure of Invention
Aiming at the defects or shortcomings of the prior art, the invention aims to provide a method and a system for classifying old asphalt pavement materials.
Therefore, the method for classifying the old asphalt pavement materials comprises the following steps:
(1) sampling old asphalt pavement materials from various sources; (2) calculating the asphalt content in each sample, obtaining the mineral aggregate gradation in each sample, and measuring the recycled asphalt penetration of each sample; (3) the relative grading similarity is adopted to characterize the mineral aggregate grading of each sample, and the relative mineral aggregate grading similarity of each sample is obtained; relative similarity of mineral composition of any sample
Figure BDA0003250249440000021
Wherein:
d (L, S) is the distance between the sample grading curve and the median grading curve,
Figure BDA0003250249440000022
Figure BDA0003250249440000023
l and S are the grading curve and the grading median curve of the sample respectively;
L＝{L(1),L(2)，…,L(n),…,L(N)},L(n)＝(xn,yn)，xnis the let-through particle size, mm, y, of the nth screen on the gradation curvenIs the passage rate on the nth screen,%;
S＝{S(1),S(2),…,S(n),…,S(N)}，S(n)＝(x′n,y′n)，x′nis the let-through particle size, mm, y 'of the nth screen on the grading median curve'nIs the passage rate on the nth screen,%;
n is more than or equal to 1 and less than or equal to N, and N is the total number of screens used when the sample mineral aggregate gradation is obtained;
knis the weight of the nth screen mesh,
Figure BDA0003250249440000024
(4) and (3) taking the recycled asphalt penetration, the asphalt content and the mineral aggregate gradation relative similarity of each sample as clustering members, and carrying out clustering analysis through K-means to combine the old asphalt pavement materials with similar material characteristics into one class.
Further, the old asphalt pavement materials of different origins have the same maximum nominal particle size.
Optionally, the sampling includes:
s1, investigating the source of the old asphalt pavement material, determining road sections and positions, and sampling the serial numbers of the road sections and the positions;
s2, multi-point core drilling sampling is carried out on different road sections;
and S3, classifying the same horizon on the same road section as the same source.
Further, in the step (4), clustering analysis is carried out on the samples of multiple sources belonging to the same layer of different road sections of the same asphalt pavement.
On the other hand, the old asphalt pavement material classification system provided by the invention comprises a data acquisition module, a mineral aggregate grading processing module and a classification module;
the data acquisition module is used for acquiring or inputting the asphalt content, mineral aggregate gradation and recycled asphalt penetration of old asphalt pavement materials from different sources; simultaneously generating grading curves and grading median curves of old asphalt pavement materials from various sources;
the mineral aggregate gradation processing module is used for representing the mineral aggregate gradation of each sample by adopting the relative similarity to obtain the relative similarity of the mineral aggregate gradation of each sample;
the classification module is used for taking the recycled asphalt penetration, the asphalt content and the relative mineral aggregate similarity of each sample as clustering members, carrying out clustering analysis through K-means, and combining the old asphalt pavement materials with similar material characteristics into a class.
Compared with the prior art, the invention has the following advantages:
(1) the method and the system for classifying the old asphalt pavement materials can classify the old asphalt pavement materials according to the material characteristics of the old asphalt pavement materials by developing a basic test, and avoid the steps of crushing, screening and the like of the old asphalt pavement materials by a traditional method in the implementation process, thereby improving the production efficiency and reducing the treatment cost.
(2) The method and the system for classifying the old asphalt pavement materials can effectively reduce the material variability of the old asphalt mixtures from different sources, and can greatly improve the proportion of the old asphalt pavement materials in the recycled mixtures and ensure the quality of the old asphalt pavement materials.
Drawings
FIG. 1 is a grading curve of top layer old asphalt mixture ore aggregates from different sources in example 1 of the present invention;
FIG. 2 shows the grading curves of middle-surface old asphalt mixture aggregates from different sources in example 1 of the present invention; the grading median in FIGS. 1 and 2 is a fixed curve defined in the technical Specification for construction of road asphalt pavements (JTG-F40-2004);
FIG. 3 shows the classification results of the sources of the upper layer old asphalt mixture in example 1 of the present invention;
fig. 4 shows the classification results of the source of the middle-layer old asphalt mixture in example 1 of the present invention.
FIG. 5 shows the clustering results of the relative similarity of the upper layers in example 1 of the present invention;
FIG. 6 is a result of clustering relative similarity of middle layers in example 1 of the present invention;
FIG. 7 is the classification result of the gradation curve of the upper layer old asphalt mixture in example 1 of the present invention;
FIG. 8 is the classification result of the gradation curve of the upper layer old asphalt mixture in example 1 of the present invention;
Detailed Description
The old asphalt pavement materials from different sources in the invention refer to old asphalt pavement materials from different road sections of the same highway or old asphalt pavement materials from different roads, for example, the maintenance engineering may involve road surfaces about twenty-three kilometers in length, but the road sections needing to be milled may only be about thirty-four kilometers, but the three-four kilometers are not continuous, and the old asphalt pavement materials may be formed by dozens of road sections and correspondingly have dozens of different sources. In addition, the different sources may be different road surfaces, different positions of different road sections, such as an upper layer, a middle layer or a lower layer of a certain road section. The present invention requires at least 5 sources to perform the analysis.
The sampling of the invention refers to randomly taking a proper amount of samples from various old asphalt pavement materials, and also refers to sampling at corresponding road sections, wherein, the sampling at the road sections can adopt but not limited to core drilling sampling, and the sampling at multiple points is carried out when the core drilling sampling is carried out, and the distance between every two points is reasonable, thus ensuring the uniform sampling. The more scientific sampling mode is that the old asphalt pavement is investigated and analyzed before sampling, the positions of the road sections need to be milled and milled to determine the source of the old asphalt pavement material, and on the basis, the information such as the initial pile numbers of the road sections from each source is recorded.
It should be noted that, the selection of the core drilling machine to drill and sample from the pavement can collect the old asphalt mixture sample of the pavement, and the depth of the core drilling is difficult to control, so that the whole surface layer (including the upper layer, the middle layer and the lower layer) is generally drilled, when only one layer or two layers (such as only the upper layer and the middle layer) are needed, the needed layer and other layers or the needed layers are stuck by asphalt and are difficult to separate, so the needed layers are required to be separated (such as cutting from the sticking part by using a cutting machine) to obtain the asphalt mixture of each layer; then, the old asphalt mixture of the core samples of the same layer is heated together and stirred, because the result measured from a single sample is discrete, and the discreteness can be reduced after mixing a plurality of yanping samples. The heating is to make the asphalt mixture soft and convenient to stir.
The asphalt content calculation method, the penetration measurement method and the mineral aggregate gradation acquisition method in the method can adopt the existing or acquirable related indexes to realize the purpose of the invention. For example:
the asphalt content calculation method can be used but is not limited to an extraction test. Wherein the extraction test is to soak the old asphalt mixture in trichloroethylene solutionSeparating the old asphalt from the old asphalt pavement material; removing the trichloroethylene solution by a rotary evaporation method, and weighing the mass m of the recovered old asphaltbThe asphalt content C,%, in the old pavement material was calculated using equation 1:
Figure BDA0003250249440000051
the mineral aggregate gradation obtaining method can adopt but is not limited to a screening method, wherein screens used in the screening method are selected according to corresponding specifications, for samples with unknown sources and unknown gradation, 10 screens of 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.6mm, 13.2mm and 16mm are generally selected to be screened together, screens with corresponding specifications are added according to the material screening conditions, for example, 19mm can be used for screening until the screen residue on the screen with the maximum size is 0, and the mineral aggregate gradation of the corresponding sample is obtained, wherein the total number N of the screens is determined by the maximum nominal particle size of the old asphalt mixture, and the values of the number N of the old asphalt mixture screens under different maximum nominal particle sizes are shown in table 1. The grading median curve is a fixed curve specified in a relevant standard or specification, such as the road asphalt pavement construction technical specification (JTG-F40-2004).
TABLE 1 values of the number N of screens of old bituminous mixtures at different maximum nominal particle diameters
Maximum nominal particle size/mm 9.6 13.2 16 19 26.5 31.5
Value range of N 8 9 10 11 12 13
The method for measuring the penetration can adopt, but is not limited to, the method for measuring the penetration (25 ℃, 5s, 100 g).
K used in the calculation of the gradation relative similarity of the inventionnThe value of the method is mainly determined by the contribution degree of the oversize old asphalt mixture mineral aggregate on the size of the corresponding grade screen mesh to the performance of the regenerated mixture, and the specific value is set based on the earlier basic research of the inventor. A specific example is shown in table 2:
TABLE 2 knValue of
Figure BDA0003250249440000061
Figure BDA0003250249440000071
The asphalt mixture type of the invention is determined based on the maximum engineering particle size, and the same type means that the old asphalt pavement materials have the same maximum nominal particle size. For example, an asphalt mixture of the AC-16 type, the maximum nominal particle size of which is 19 mm; the AC-20 type asphalt mixture has the maximum nominal grain diameter of 26.5 mm.
The classification method of the present invention can be implemented by computer software.
Example 1:
the various old asphalt pavement materials of the embodiment are from the same highway, the old asphalt pavement of the related expressway is built in 2004, the old asphalt pavement of the expressway undergoes 8 medium and small repair projects in the last ten years, and the materials adopted for pavement maintenance relate to micro-surfacing mixture, slurry seal mixture and hot-mix asphalt mixture which are used for local patching, hot asphalt crack pouring and other treatment means.
(1) Sampling:
s1, road surface survey: the pavement structure of the original old asphalt pavement is an upper surface layer of 4cmAC-16 dense-graded hot-mixed asphalt mixture, a middle surface layer of +6cmAC-20 dense-graded hot-mixed asphalt mixture and a lower surface layer of +8cmAC-20 dense-graded hot-mixed asphalt mixture. According to a major repair maintenance design scheme, milling and planing an upper surface layer and a middle surface layer of an old asphalt pavement layer by layer, and filling the old asphalt pavement layer with a corresponding and matched type of traditional hot-mix asphalt mixture; and the old asphalt mixture obtained by milling is used for producing a regenerated asphalt mixture for maintenance of other road sections.
The highway asphalt pavement has 16 sections which are designed to be milled in an upper surface layer and a middle surface layer in a layering mode, the positions of the sections are shown in a table 3 as old asphalt mixture sources, the old asphalt mixtures of the upper surface layer and the middle surface layer in the same old asphalt pavement material source are distinguished, wherein A represents the upper surface layer, and B represents the middle surface layer.
TABLE 3 overview of the source of old asphalt pavement materials
Figure BDA0003250249440000081
And S2, sampling. In the embodiment, core drilling and sampling are carried out on the 16 old asphalt pavement material sources, the core drilling thickness is that the core drilling thickness penetrates through the whole asphalt pavement surface layers (the upper surface layer, the middle surface layer and the lower surface layer), the sampling position is positioned in an emergency stop zone, the core drilling quantity of each old asphalt pavement material source is 6, the distance between every two adjacent core samples is 8m, 96 core samples are obtained totally, and the milepost number of the core drilling position is recorded as the core sample number.
And S3, extracting the old asphalt mixture of the target layer. This example uses a cutter to cut the above 96 core samplesSeparating the upper, middle and lower surface layers, discarding the asphalt mixture of the lower surface layer, and reserving the asphalt mixture of the upper and middle surface layers to respectively obtain 96 upper surface layer core samples and 96 middle surface layer core samples; heating 6 upper surface layers of the same source road section in a 120 deg.C oven for 1 hr to loosen them, stirring for 3min with an asphalt mixture stirrer, weighing the mass ma(ii) a The same operation was performed for the upper and middle face core samples of all the source road sections, and the results are shown in table 4.
TABLE 4 quality of top and middle asphalt mixes from different sources isolated from core samples
Figure BDA0003250249440000082
Figure BDA0003250249440000091
(2) Calculating the asphalt content in each sample, obtaining the mineral aggregate gradation in each sample, and measuring the recycled asphalt penetration of each sample;
and S4, calculating the asphalt content of the old asphalt mixture. In the embodiment, an extraction test is specifically adopted, the old asphalt mixture of the upper surface layer and the middle surface layer is respectively soaked in a trichloroethylene solution, and the old asphalt is separated from the old asphalt pavement material; removing the trichloroethylene solution by a rotary evaporation method, and weighing the mass m of the recovered old asphaltbAnd g, calculating the asphalt content in the old pavement material by using the formula 1, calculating the asphalt content of the original old asphalt mixture, recording the asphalt content as C,%, and obtaining the results of the asphalt quality and the asphalt content in the upper and middle surface layer old asphalt mixtures shown in the table 5.
TABLE 5 asphalt quality and asphalt content of top and middle asphalt mixes from different sources
Figure BDA0003250249440000092
Figure BDA0003250249440000101
And S5, testing the aging degree, namely the penetration degree, of the recycled asphalt of each sample. In this example, the penetration of the recycled asphalt was measured by using an asphalt penetration tester, and the results are shown in Table 6.
TABLE 6 penetration of recycled asphalt in top and middle asphalt mixtures from different sources
Figure BDA0003250249440000102
And S6, obtaining the mineral aggregate gradation of each sample. In this embodiment, the old asphalt mixture is screened to obtain mineral aggregate gradation of the upper layer and the middle layer of the old asphalt mixture from different sources, and the results are shown in tables 6 and 7, respectively, as shown in fig. 1 and 2.
Wherein, to the upper layer bituminous mixture, N11, corresponding screen cloth is: 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.6mm, 13.2mm, 16mm, 19 mm.
For the middle layer asphalt mixture, N is 12, and the corresponding screen mesh is: 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.6mm, 13.2mm, 16mm, 19mm, 26.5 mm.
Figure BDA0003250249440000121
Figure BDA0003250249440000131
(3) And characterizing the mineral aggregate gradation of each sample by using the relative gradation similarity to obtain the relative gradation similarity of the mineral aggregate of each sample. The calculation method is carried out by adopting the method of the invention, and can also be carried out by a computer, and the result is shown in Table 8.
TABLE 8 relative similarity of mineral composition grades of top and middle asphalt mixes from different sources
Figure BDA0003250249440000141
(4) Clustering analysis: simultaneously introducing the asphalt content C, the recycled asphalt softening point S and the grading relative similarity RS of all the asphalt mixtures of all the layers into a clustering system, and carrying out clustering analysis through K-means. And classifying the old asphalt pavement materials from different sources according to the characteristics of the materials. The clustering information is shown in Table 9, and the clustering results are shown in Table 10. For the convenience of observation, the clustering results are plotted in a radar chart, and the results are shown in fig. 3 and 4. As can be seen from the observation of the graphs in FIGS. 3 and 4, the old asphalt pavement materials classified in the same class have similar material characteristics, and the classification of the old asphalt pavement materials by the method provided by the invention can classify the old asphalt pavement materials with similar properties into one class, thereby effectively reducing the source variability of the old asphalt mixtures.
TABLE 9 clustering information
Figure BDA0003250249440000151
TABLE 10 clustering results
Figure BDA0003250249440000152
Meanwhile, in order to evaluate whether the grading relative similarity can classify the old asphalt mixtures from different sources according to the characteristics thereof, the inventors drawn a scatter diagram according to the clustering results in table 10, and the results are shown in fig. 5 and 6. Therefore, the relative similarity of the grading in the same class is very close, which indicates that the clustering effect is good. In addition, in order to verify whether the gradation curves of the old asphalt mixtures classified into the same class have high similarity, the gradation curves classified into the same class in table 10 were plotted in the same coordinate, and whether the gradation curves are highly overlapped was observed, as shown in tables 7 and 8. As can be seen, the grading curve classified in the same class has high coincidence degree, which indicates that the classification result is ideal.

Claims (5)

1. A method for classifying old asphalt pavement materials is characterized by comprising the following steps:
(1) sampling old asphalt pavement materials from different sources;
(2) calculating the asphalt content in each sample, obtaining the mineral aggregate gradation in each sample, and measuring the recycled asphalt penetration of each sample;
(3) the relative grading similarity is adopted to characterize the mineral aggregate grading of each sample, and the relative mineral aggregate grading similarity of each sample is obtained; wherein the relative mineral composition similarity RS of any sample,
Figure FDA0003250249430000011
wherein:
d (L, S) is the distance between the sample grading curve and the grading median curve,
Figure FDA0003250249430000012
Figure FDA0003250249430000013
l and S are the grading curve and the grading median curve of the sample respectively;
L＝{L(1)，L(2)，…，L(n)，…，L(N)}，L(n)＝(xn，yn)，xnis the let-through particle size, mm, y, of the nth screen on the gradation curvenIs the passage rate on the nth screen,%;
S＝{S(1)，S(2)，…，S(n)，…，S(N)}，S(n)＝(x′n，y′n)，x′nis the let-through particle size, mm, y 'of the nth screen on the grading median curve'nIs the passage rate on the nth screen,%;
n is more than or equal to 1 and less than or equal to N, and N is the total number of screens used when the sample mineral aggregate gradation is obtained;
knis the weight of the nth screen mesh,
Figure FDA0003250249430000014
(4) and (3) taking the recycled asphalt penetration, the asphalt content and the mineral aggregate gradation relative similarity of each sample as clustering members, and carrying out clustering analysis through K-means to combine the old asphalt pavement materials with similar material characteristics into one class.
2. The method for sorting old asphalt pavement materials according to claim 1, wherein the old asphalt pavement materials of different sources have the same maximum nominal particle size.
3. The method for classifying old asphalt pavement materials according to claim 1, wherein the sampling comprises:
s1, surveying the old asphalt pavement, determining road sections and positions, numbering and sampling;
s2, layering and multi-point core drilling sampling are carried out on different road sections;
and S3, classifying the same horizon on the same road section as the same source.
4. The method for classifying old asphalt pavement materials from multiple sources as claimed in claim 4, wherein the step (4) is implemented by performing cluster analysis on samples from multiple sources belonging to the same layer of the same old asphalt pavement on different road sections.
5. The classification system for the old asphalt pavement materials is characterized by comprising a data acquisition module, a mineral aggregate grading processing module and a classification module;
the data acquisition module is used for acquiring or inputting the asphalt content, mineral aggregate gradation and recycled asphalt penetration of old asphalt pavement materials from different sources; simultaneously generating grading curves and grading median curves of old asphalt pavement materials from various sources;
the mineral aggregate gradation processing module is used for representing the mineral aggregate gradation of each sample by adopting the relative similarity to obtain the relative similarity of the mineral aggregate gradation of each sample;
the classification module is used for taking the recycled asphalt penetration, the asphalt content and the relative mineral aggregate similarity of each sample as clustering members, carrying out clustering analysis through K-means, and combining the old asphalt pavement materials with similar material characteristics into a class.
CN202111043246.3A 2021-09-07 2021-09-07 Method and system for classifying old asphalt pavement materials Pending CN113850303A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114462543A (en) * 2022-02-15 2022-05-10 河南四通实业有限公司 Screening method for producing recycled asphalt concrete

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114462543A (en) * 2022-02-15 2022-05-10 河南四通实业有限公司 Screening method for producing recycled asphalt concrete
CN114462543B (en) * 2022-02-15 2024-05-03 河南四通实业有限公司 Screening method for producing recycled asphalt concrete

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