CN111474157A - Method and system for determining fusion degree of recycled asphalt mixture - Google Patents
Method and system for determining fusion degree of recycled asphalt mixture Download PDFInfo
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Abstract
The invention discloses a method and a system for determining the fusion degree of a recycled asphalt mixture, and relates to the field of detection and evaluation of basic physical properties of asphalt and the asphalt mixture. The method comprises the following steps: extracting old asphalt in a regenerated asphalt mixture sample, and mixing the old asphalt and the new asphalt in different proportions to obtain a plurality of calibration test pieces; performing fluorescence microscopic analysis on the calibration test piece to obtain calibration fluorescence intensity; obtaining a fusion degree regression equation by using a linear fitting method and calibrating fluorescence intensity; carrying out layered stripping on the regenerated asphalt mixture to be detected to obtain a detection test piece; and obtaining the fusion condition of the new asphalt and the old asphalt in the regenerated asphalt mixture to be detected by using the regression equation of the detection fluorescence intensity and the fusion degree of the detection test piece. By combining the fluorescence microscopic analysis method and the layered stripping method, the invention can conveniently and effectively microscopically analyze the fusion condition of the new and old asphalt in the regenerated asphalt mixture and determine the fusion effect of the regeneration process on the new and old asphalt.
Description
Technical Field
The invention relates to the field of detection and evaluation of basic physical properties of asphalt and an asphalt mixture, in particular to a method and a system for determining the fusion degree of a recycled asphalt mixture.
Background
With the implementation of the sustainable development concept, the recycled asphalt mixture is widely applied to the field of road engineering. People not only pay attention to the utilization amount of Reclaimed Asphalt (RAP) but also pay more attention to the quality and performance of the Reclaimed Asphalt, and the fusion effect of new and old Asphalt plays a decisive role in the quality and performance of the Reclaimed Asphalt. However, it is difficult to clearly understand and explain the mechanism of the performance difference and change of the recycled asphalt mixture only by simple mechanical and road performance evaluation, and further, proper proportion and process can seriously affect the design, construction quality, service life and investment benefit of the recycled asphalt mixture road surface, and improper proportion and process can even hinder the development of the recycled asphalt mixture road surface technology.
Research and engineering practices have suggested that RAP may be in three hypothetical fusion states during regeneration: 1. in the state of black stones, the old asphalt and the new asphalt are not fused at all, and RAP can be regarded as pure black stone and is cemented by the new asphalt; 2. in a complete fusion state, the old asphalt and the new asphalt are fused by 100 percent and jointly act as a cementing material of new and old stones; 3. in the intermediate fusion state, a certain proportion of old asphalt and new asphalt are fused, the proportion of the new and old fused asphalt is gradually reduced from outside to inside to form a cementing layer of the mixture, and the center of RAP is aggregate particles, as shown in figure 1.
The method comprises the following steps of (1) separating an asphalt mixture in a regenerated asphalt mixture by adopting a delamination method, sequentially soaking the asphalt mixture in four beakers filled with trichloroethylene (a class of carcinogenic substances), extracting the regenerated asphalt wrapped on different levels of an RAP surface, and respectively testing the complex modulus of a regenerated asphalt sample to evaluate the fusion effect of the new asphalt and the old asphalt, (2) analyzing by adopting Gel Permeation Chromatography (GPC) and evaluating the fusion condition of the new asphalt and the old asphalt according to the proportion of macromolecules (L MS) in the regenerated asphalt, (3) evaluating the fusion state of the new asphalt and the old asphalt in the regenerated asphalt sample by adopting a Fourier spectrum (FTIR) technology, and (4) discussing the change rule of the micro surface of the new asphalt and the old asphalt with different blending proportions by adopting an atomic force microscope to evaluate the fusion degree of the new asphalt and the old asphalt.
Disclosure of Invention
The invention aims to provide a method and a system for determining the fusion degree of a recycled asphalt mixture, which solve the problem of complex process of the existing method for determining the fusion degree of the recycled asphalt mixture.
In order to achieve the purpose, the invention provides the following scheme:
a method for determining the fusion degree of a recycled asphalt mixture comprises the following steps:
extracting old asphalt in a regenerated asphalt mixture sample, and mixing the old asphalt and the new asphalt in different proportions to obtain a plurality of calibration test pieces;
performing fluorescence microscopic analysis on the calibration test piece to obtain the calibration fluorescence intensity of the calibration test piece;
obtaining a fusion degree regression equation by utilizing a linear fitting method and the calibrated fluorescence intensity;
carrying out layered stripping on the regenerated asphalt mixture to be detected to obtain a detection test piece;
carrying out fluorescence microscopic analysis on the detection test piece to obtain the detection fluorescence intensity of the detection test piece;
and obtaining the fusion condition of the new asphalt and the old asphalt in the to-be-detected regenerated asphalt mixture by using the detection fluorescence intensity and the fusion degree regression equation.
Optionally, the extracting old asphalt in the recycled asphalt mixture sample, and mixing the old asphalt with the new asphalt in different proportions to obtain a plurality of calibration test pieces, specifically including:
extracting old asphalt in the regenerated asphalt mixture sample by adopting a rotary evaporator method or an Abson method;
and mixing the old asphalt and the new asphalt according to different proportions of 0: 1-1: 1 to obtain a plurality of calibration test pieces.
Optionally, the performing fluorescence microscopic analysis on the calibration test piece to obtain the calibration fluorescence intensity of the calibration test piece specifically includes:
performing fluorescence microscopic analysis on the calibration test piece to obtain a plurality of calibration fluorescence microscopic images of the calibration test piece;
respectively carrying out gray level processing on the plurality of calibrated fluorescence microscopic images of the calibrated test piece to obtain a plurality of calibrated gray level images of the calibrated test piece;
calculating the gray value of each calibration gray image;
and calculating the average value of the gray values of the calibration gray images of the calibration test piece to obtain a calibration gray average value, and taking the calibration gray average value as the calibration fluorescence intensity of the calibration test piece.
Optionally, the to-be-detected recycled asphalt mixture is delaminated to obtain a detection test piece, and the method specifically includes:
sequentially placing the to-be-detected regenerated asphalt mixture into a plurality of extraction solutions, so that the regenerated asphalt of different layers of the to-be-detected regenerated asphalt mixture is respectively dissolved in the extraction solutions to obtain a plurality of asphalt dissolving solutions;
and air-drying and heating each asphalt dissolving solution to obtain a plurality of detection test pieces.
Optionally, the performing fluorescence microscopic analysis on the detection test piece to obtain the detection fluorescence intensity of the detection test piece specifically includes:
performing fluorescence microscopic analysis on the detection test piece to obtain a plurality of detection fluorescence microscopic images of the detection test piece;
carrying out gray level processing on the multiple detection fluorescence microscopic images of the detection test piece respectively to obtain multiple detection gray level images of the detection test piece;
calculating a gray value of each of the detected gray images;
and calculating the average value of the gray values of the detection gray images of the detection test piece to obtain the average value of the detection gray values, and taking the average value of the detection gray values as the detection fluorescence intensity of the detection test piece.
A system for determining a fusion degree of a reclaimed asphalt mixture, comprising:
the calibration test piece manufacturing module is used for extracting old asphalt in a regenerated asphalt mixture sample, and mixing the old asphalt and the new asphalt in different proportions to obtain a plurality of calibration test pieces;
the calibration fluorescence intensity acquisition module is used for carrying out fluorescence microscopic analysis on the calibration test piece to obtain the calibration fluorescence intensity of the calibration test piece;
the fusion degree regression equation determining module is used for obtaining a fusion degree regression equation by utilizing a linear fitting method and the calibrated fluorescence intensity;
the detection test piece manufacturing module is used for carrying out layered stripping on the to-be-detected regenerated asphalt mixture to obtain a detection test piece;
the detection fluorescence intensity acquisition module is used for carrying out fluorescence microscopic analysis on the detection test piece to obtain the detection fluorescence intensity of the detection test piece;
and the fusion degree determining module is used for obtaining the fusion condition of the new asphalt and the old asphalt in the to-be-detected recycled asphalt mixture by using the detection fluorescence intensity and the fusion degree regression equation.
Optionally, the calibration test piece manufacturing module specifically includes:
the old asphalt extraction unit is used for extracting old asphalt in the regenerated asphalt mixture sample by adopting a rotary evaporator method or an Abson method;
and the calibration test piece manufacturing unit is used for mixing and dissolving the old asphalt and the new asphalt according to different proportions of 0: 1-1: 1 to obtain a plurality of calibration test pieces.
Optionally, the calibration fluorescence intensity obtaining module specifically includes:
a calibration fluorescence microscopic image obtaining unit, configured to perform fluorescence microscopic analysis on the calibration test piece to obtain a plurality of calibration fluorescence microscopic images of the calibration test piece;
the gray processing unit is used for respectively carrying out gray processing on the plurality of calibrated fluorescence microscopic images of the calibrated test piece to obtain a plurality of calibrated gray images of the calibrated test piece;
the calibration gray value calculation unit is used for calculating the gray value of each calibration gray image;
and the calibration fluorescence intensity calculating unit is used for calculating the average value of the gray values of the calibration gray images of the calibration test piece to obtain a calibration gray average value, and taking the calibration gray average value as the calibration fluorescence intensity of the calibration test piece.
Optionally, the detection test piece manufacturing module specifically includes:
the asphalt extraction unit is used for sequentially placing the to-be-detected regenerated asphalt mixture into a plurality of extraction solutions, so that the regenerated asphalt of different layers of the to-be-detected regenerated asphalt mixture is respectively dissolved in the extraction solutions to obtain a plurality of asphalt dissolving solutions;
and the detection test piece manufacturing unit is used for air-drying and heating each asphalt dissolving solution to obtain a plurality of detection test pieces.
Optionally, the fluorescence intensity detecting module specifically includes:
the detection fluorescence microscopic image acquisition unit is used for carrying out fluorescence microscopic analysis on the detection test piece to obtain a plurality of detection fluorescence microscopic images of the detection test piece;
the detection gray image acquisition unit is used for respectively carrying out gray processing on the multiple detection fluorescence microscopic images of the detection test piece to obtain multiple detection gray images of the detection test piece;
a detection gray value calculation unit for calculating a gray value of each of the detection gray images;
and the detection fluorescence intensity calculating unit is used for calculating the average value of the gray values of the detection gray images of the detection test piece to obtain the average value of the detection gray values, and taking the average value of the detection gray values as the detection fluorescence intensity of the detection test piece.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a method and a system for determining the fusion degree of a recycled asphalt mixture. The method comprises the following steps: extracting old asphalt in a regenerated asphalt mixture sample, and mixing the old asphalt and the new asphalt in different proportions to obtain a plurality of calibration test pieces; performing fluorescence microscopic analysis on the calibration test piece to obtain the calibration fluorescence intensity of the calibration test piece; obtaining a fusion degree regression equation by using a linear fitting method and calibrating fluorescence intensity; carrying out layered stripping on the regenerated asphalt mixture to be detected to obtain a detection test piece; performing fluorescence microscopic analysis on the detection test piece to obtain the detection fluorescence intensity of the detection test piece; and obtaining the fusion condition of the new asphalt and the old asphalt in the regenerated asphalt mixture to be detected by using a regression equation of the fluorescence intensity and the fusion degree. The method comprises the steps of carrying out fluorescence microscopic analysis on calibration test pieces to obtain calibration fluorescence microscopic images of the calibration test pieces with different old asphalt contents, establishing a regression equation of the fusion condition of new and old asphalt in the regenerated asphalt mixture by utilizing gray values of the calibration fluorescence microscopic images with different old asphalt contents, and obtaining the fusion condition of the new and old asphalt in the regenerated asphalt mixture to be detected by utilizing a detection test piece, a fluorescence microscopic analysis method and a fusion degree regression equation. By combining a fluorescence microscopic analysis method and a layering stripping method, the invention can conveniently and effectively microscopically analyze the fusion condition of the new and old asphalt in the regenerated asphalt mixture, study the influence mechanism of different regeneration processes on the fusion of the new and old asphalt and determine the fusion effect of the regeneration processes on the new and old asphalt.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of the fusion state of new and old asphalt in the background art;
fig. 2 is a flowchart of a method for determining a fusion degree of a recycled asphalt mixture according to an embodiment of the present invention;
FIG. 3 is a graph comparing fluorescence intensity of new asphalt and old asphalt provided by an example of the present invention;
fig. 4 is a structural diagram of a system for determining a fusion degree of a recycled asphalt mixture according to an embodiment of the present invention;
FIG. 5 is a bar graph of the quality of each layer of recycled asphalt at different soak times as provided by an example of the present invention;
FIG. 6 is a bar graph comparing the gray scale average values of fresh asphalt and warm-mixed asphalt provided by the embodiments of the present invention;
FIG. 7 is a linear fitting graph of an average calibration gray scale value and an old asphalt content of a calibration test piece provided by an embodiment of the present invention;
fig. 8 is a bar chart of the fusion efficiency of new and old asphalt of each reclaimed asphalt sample provided by the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method and a system for determining the fusion degree of a recycled asphalt mixture, which solve the problem of complex process of the existing method for determining the fusion degree of the recycled asphalt mixture.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The embodiment provides a method for determining a fusion degree of a recycled asphalt mixture, and fig. 2 is a flowchart of the method for determining the fusion degree of the recycled asphalt mixture provided by the embodiment of the invention. Referring to fig. 2, the method for determining the fusion degree of the recycled asphalt mixture includes:
Step 101 specifically includes:
and extracting the old asphalt in the regenerated asphalt mixture sample by adopting a rotary evaporator method or an Abson method. According to the road engineering asphalt and asphalt mixture test specification (JTG E20-2011), the old asphalt in the RAP is extracted by adopting a rotary evaporator method or an Abson method.
Mixing and dissolving old asphalt and new asphalt according to different proportions of 0: 1-1: 1 to obtain a plurality of calibration test pieces. In order to calibrate the fluorescence intensity of the recycled asphalt mixture sample under different mixing amounts of new and old asphalt, in this example, old asphalt in the recycled asphalt mixture sample (RAP sample) is extracted, and the old asphalt and the new asphalt are mixed and melted in different proportions of 0% -100% by taking 20% as a gradient increment, that is, the proportions of the old asphalt and the new asphalt are 0:1 (0%: 100%), 0.2:1 (20%: 100%), 0.4:1 (40%: 100%), 0.6:1 (60%: 100%), 0.8:1 (80%: 100%) and 1:1 (100%: 100%), and calibration test pieces are manufactured.
And 102, performing fluorescence microscopic analysis on the calibration test piece to obtain the calibration fluorescence intensity of the calibration test piece.
Step 102 specifically includes:
performing fluorescence microscopic analysis on the calibration test piece to obtain a plurality of calibration fluorescence microscopic images of the calibration test piece; the method specifically comprises the following steps: and acquiring a plurality of calibration fluorescence microscopic images of the calibration test piece by using a fluorescence microscope. The fluorescence microscope emitted light at a wavelength of 450mm to 490mm, light intensity at 12cd (candela), exposure time at 1 second(s), and magnification at 200 times. Because the new asphalt can permeate from the outer layer of the old asphalt to the inner layer, and the permeation is uneven, the new asphalt and the old asphalt in the calibration test piece are not uniformly fused, five different positions of the calibration test piece need to be shot, and five calibration fluorescence microscopic images are taken.
And respectively carrying out gray level processing on the plurality of calibrated fluorescence microscopic images of the calibrated test piece to obtain a plurality of calibrated gray level images of the calibrated test piece. And carrying out gray level processing on the calibrated fluorescence microscopic image by utilizing Matlab software to obtain a calibrated gray level image.
And calculating the gray value of each calibration gray image. And expressing the fluorescence intensity of each calibration test piece by using the gray value in the calibration gray image.
And calculating the average value of the gray values of a plurality of calibration gray images of the calibration test piece to obtain a calibration gray average value, and taking the calibration gray average value as the calibration fluorescence intensity of the calibration test piece. And taking the average value of the gray values of the five calibration gray level images of one calibration test piece to represent the calibration fluorescence intensity of the calibration test piece, and enhancing the representativeness of the calibration fluorescence intensity data.
And 103, obtaining a fusion degree regression equation by using a linear fitting method and calibrating fluorescence intensity. And obtaining a fusion degree regression equation by linear fitting the calibrated fluorescence intensities of the calibrated test pieces, wherein the fusion degree regression equation is a relation equation between the calibrated fluorescence intensities of the calibrated test pieces and the old asphalt content.
Before step 104, acquiring a to-be-detected recycled asphalt mixture, and judging whether the types of old aggregates and new asphalt used in the recycling test of the to-be-detected recycled asphalt mixture are the same as the types of old aggregates and new asphalt used in the recycling test of a recycled asphalt mixture sample; if the old aggregate and the new asphalt used in the regeneration test are the same in type and other regeneration conditions are changed, the fusion degree regression equation of step 103 can be used; if one or two of the types of the old aggregate and the new asphalt used in the regeneration test are changed, the step 101 needs to be returned to, and the fusion degree regression equation is reestablished by using the regenerated asphalt mixture sample with the same type as the old aggregate and the new asphalt used in the regeneration test of the regenerated asphalt mixture to be detected.
And 104, carrying out layered stripping on the regenerated asphalt mixture to be detected to obtain a detection test piece.
Step 104 specifically includes:
and sequentially placing the to-be-detected regenerated asphalt mixture into the plurality of extraction solutions, so that the regenerated asphalt of different layers of the to-be-detected regenerated asphalt mixture is respectively dissolved in the plurality of extraction solutions, and a plurality of asphalt dissolving solutions are obtained. Firstly, carrying out a regeneration test on an old aggregate in the asphalt mixture, and screening the old aggregate before regeneration to mix the old aggregate with the particle size of 0 millimeter (mm) -9.5mm, a new aggregate with the particle size of more than 9.5mm and new asphalt so as to obtain a regenerated asphalt mixture in order to distinguish regenerated RAP particles. The asphalt mixture mainly comprises stone and asphalt cementing material, including broken stone, asphalt and powder material, the stone plays a role of skeleton, and the asphalt plays a role of cementing. When the recycled asphalt mixture is produced, because the performance of old asphalt in the asphalt mixture is degraded, new asphalt and new aggregate are required to be added and mixed with the asphalt mixture to obtain the recycled asphalt mixture to be detected (RAP to be detected). The RAP particles do not include old bitumen.
And separating RAP to be detected with the particle size of less than 9.5mm from the reclaimed asphalt mixture to be detected, and taking 45 grams (g) of the separated RAP to be detected. Three beakers each containing 75 milliliters (ml) of tetrahydrofuran solution were prepared and the inner, middle, and outer three layers of pitch for RAP to be detected were extracted separately. And (3) soaking the RAP to be detected wrapped by the filter cloth in three beakers in sequence, wherein the soaking time in the last beaker is properly prolonged until the asphalt wrapped on the surface of the RAP to be detected in the filter cloth is completely dissolved in the tetrahydrofuran solution. The soaking time is preferably 2 minutes (min). The particle size of the filter cloth is 400 meshes, and the filter cloth is used for wrapping RAP to be detected in a layering stripping test, so that the influence of mineral powder on the results of the layering stripping test is reduced.
And air-drying and heating each asphalt dissolving solution to obtain a plurality of detection test pieces. And (3) placing the beaker in a fume hood for air drying, after the liquid in the beaker is evaporated until the liquid is invisible to human eyes, placing the beaker in a drying oven at 60 ℃ for heating for about 10 minutes to completely evaporate tetrahydrofuran in the beaker, thereby obtaining a regenerated asphalt sample.
After obtaining the regenerated asphalt sample, the beaker was placed in an oven at 165 ℃ and heated to a fluid state, and the asphalt on the beaker was gently scraped with a spatula and dropped on a glass slide, which was gently covered with a cover glass. Then, the slide glass is placed in an oven at 165 ℃ and heated for about 2 minutes, and a test piece with the thickness of about 1mm is obtained.
And 105, performing fluorescence microscopic analysis on the detection test piece to obtain the detection fluorescence intensity of the detection test piece.
Step 105 specifically includes:
and carrying out fluorescence microscopic analysis on the detection test piece to obtain a plurality of detection fluorescence microscopic images of the detection test piece. And acquiring a detection fluorescence microscopic image of the detection test piece by using a fluorescence microscope. The fluorescence microscope emitted light at a wavelength of 450mm to 490mm, light intensity at 12cd, exposure time at 1s, and magnification at 200 times. In the regeneration test process, the new asphalt permeates from the outer layer of the old asphalt to the inner layer, and the permeation is not uniform, so that the new asphalt and the old asphalt in the test piece obtained by delamination and stripping are not uniformly fused, five different positions of the same test piece need to be shot, and five detection fluorescence microscopic images of the test piece are obtained.
And respectively carrying out gray level processing on the plurality of detection fluorescence microscopic images of the detection test piece to obtain a plurality of detection gray level images of the detection test piece. And carrying out gray level processing on the fluorescence microscopic image by using Matlab software to obtain a gray level image.
The gray value of each detected gray image is calculated.
And calculating the average value of the gray values of a plurality of detection gray images of the detection test piece to obtain the average value of the detection gray values, and taking the average value of the detection gray values as the detection fluorescence intensity of the detection test piece. In the embodiment, the average value of the gray values of five detected fluorescence microscopic images of a detected test piece is taken to represent the fluorescence intensity of the detected test piece.
And 106, obtaining the fusion condition of the new asphalt and the old asphalt in the regenerated asphalt mixture to be detected by using a regression equation of the fluorescence intensity and the fusion degree. And substituting the detected fluorescence intensity into a fusion degree regression equation to calculate the content of the old asphalt in the detection test pieces, and calculating the content of the old asphalt in each detection test piece to analyze the fusion condition of the new asphalt and the old asphalt in each layer of the regenerated asphalt mixture wrapped on the surface of the RAP to be detected under different regeneration processes and comprehensively evaluate the fusion degree of the new asphalt and the old asphalt in the regenerated asphalt mixture.
The fusion efficiency (fusion degree) of the recycled asphalt mixture can be calculated by the ratio of the content of the new asphalt in the inner-layer recycled asphalt to the content of the new asphalt in the inner-layer recycled asphalt when the new asphalt and the old asphalt are completely fused. The fusion efficiency BE of the new asphalt and the old asphalt in the regenerated asphalt mixture is as follows:
represents the content of old asphalt in the inner-layer regenerated asphalt in the regenerated asphalt mixture, CVRepresents the content of new asphalt added during the regeneration test in the regenerated asphalt mixture, CRThe content of the old asphalt in the reclaimed asphalt mixture is shown. In the process of the regeneration test, the new asphalt is wrapped outside the old asphalt under the action of mechanical mixing, and the new asphalt gradually permeates from the outer layer to the inner layer of the old asphalt until the new asphalt and the old asphalt in the regenerated asphalt mixture are completely mixed and dissolved. Different regeneration conditions can cause different rates of penetration of the new bitumen into the old bitumen, resulting in different regeneration effects. Generally, the reclaimed asphalt layer of the reclaimed RAP will exhibit an outer layer of new asphalt content>Middle layer>The fusion efficiency of the inner layer is mainly aimed at the inner layer, and the outer layer is easy to fuse basically, so that the content of the old asphalt of the inner layer is taken as the main key of the fusion, and the ratio of the content of the new asphalt of the inner layer to the content of the new asphalt in the regenerated asphalt of the inner layer when the new asphalt and the old asphalt are completely mixed is taken as the judgment standard of the fusion efficiency. However, it is possible that the new asphalt content of the inner layer is much higher than that of the other layersUnder the special condition of the content of the new asphalt in the layer, the quantity of the old asphalt actually fused with the new asphalt is less, and the fusion effect of the new asphalt and the old asphalt is poor. Therefore, when the regeneration process is selected, it is necessary to determine the fusion condition of the respective layers of the regenerated asphalt, in addition to the fusion efficiency of the new asphalt and the old asphalt.
When the new asphalt and the old asphalt are completely fused, namely the new asphalt and the old asphalt in the regenerated asphalt mixture are in a completely fused state, the contents of the old asphalt in all layers of the regenerated asphalt in the regenerated asphalt mixture are completely the same. When the new asphalt and the old asphalt are completely melted, the content C of the new asphalt of the inner-layer regenerated asphalt in the regenerated asphalt mixture is as follows:
when the new and old asphalt is partially fused, the fusion efficiency BE' of the new and old asphalt in the inner-layer regenerated asphalt mixture is as follows:
C3the content of the old asphalt in the inner-layer regenerated asphalt in the regenerated asphalt mixture is shown.
Fluorescence microscopic analysis is a rapid and simple detection method, and is widely applied to observing the microstructure of modified asphalt, such as the particle size and distribution of SBS (Styrene-Butadiene-Styrene) modifier, the fusion condition of epoxy resin in asphalt, and the like. The new and old asphalt can excite different fluorescence intensities under the same incident light, and as shown in figure 3, by utilizing the characteristic, the fusion degree of the new and old asphalt in the regenerated asphalt mixture can be evaluated by using a fluorescence microscopic analysis method. The method comprises the steps of firstly, extracting a to-be-detected regenerated asphalt mixture layer by adopting a tetrahydrofuran solvent (2B carcinogenic substances) to obtain a detection test piece; then, detecting the fluorescence intensity of each layer of the regenerated asphalt mixture to be detected after delamination through fluorescence microscopic analysis to obtain a fluorescence microscopic image of a detection test piece; and (3) representing the fluorescence intensity of different layers of the to-be-detected recycled asphalt mixture by using the gray average value of the fluorescence microscopic image of the detection test piece as an evaluation index, so as to evaluate the fusion effect of the new asphalt and the old asphalt in the to-be-detected recycled asphalt mixture. The recycled asphalt mixtures with different old asphalt contents can excite different fluorescence intensities, fluorescence microscopic analysis can obtain fluorescence microscopic images of the recycled asphalt mixtures to be detected, and due to the fact that the old asphalt contents of all detection test pieces are different, the fluorescence microscopic images with different brightness can be obtained; the fluorescence microscopic image is converted into a gray level image, and the average gray level value is used as an index to represent the fluorescence intensity of the to-be-detected recycled asphalt mixture, so that the fusion effect of new asphalt and old asphalt in the to-be-detected recycled asphalt mixture is evaluated. The fusion effect of different regeneration processes is evaluated by calculating the fusion efficiency of new and old asphalt in the regenerated asphalt mixture and combining the fusion conditions of the regenerated asphalt of each layer, and the selection and the application of the regeneration processes in engineering are guided.
The embodiment also provides a system for determining the fusion degree of the recycled asphalt mixture, and fig. 4 is a structural diagram of the system for determining the fusion degree of the recycled asphalt mixture provided by the embodiment of the invention. Referring to fig. 4, the system for determining the fusion degree of the recycled asphalt mixture includes:
the calibration test piece manufacturing module 201 is used for extracting old asphalt in the regenerated asphalt mixture sample, and mixing the old asphalt with the new asphalt according to different proportions to obtain a plurality of calibration test pieces.
The calibration test piece manufacturing module 201 specifically includes:
and the old asphalt extraction unit is used for extracting the old asphalt in the regenerated asphalt mixture sample by adopting a rotary evaporator method or an Abson method.
And the calibration test piece manufacturing unit is used for mixing and dissolving the old asphalt and the new asphalt according to different proportions of 0: 1-1: 1 to obtain a plurality of calibration test pieces.
And the calibration fluorescence intensity acquisition module 202 is used for performing fluorescence microscopic analysis on the calibration test piece to obtain the calibration fluorescence intensity of the calibration test piece.
The calibration fluorescence intensity obtaining module 202 specifically includes:
and the calibration fluorescence microscopic image acquisition unit is used for performing fluorescence microscopic analysis on the calibration test piece to obtain a plurality of calibration fluorescence microscopic images of the calibration test piece.
And the gray processing unit is used for respectively carrying out gray processing on the plurality of calibrated fluorescence microscopic images of the calibrated test piece to obtain a plurality of calibrated gray images of the calibrated test piece.
And the calibration gray value calculating unit is used for calculating the gray value of each calibration gray image.
And the calibration fluorescence intensity calculating unit is used for calculating the average value of the gray values of the calibration gray images of the calibration test piece to obtain the average value of the calibration gray, and taking the average value of the calibration gray as the calibration fluorescence intensity of the calibration test piece.
And the fusion degree regression equation determining module 203 is used for obtaining the fusion degree regression equation by using a linear fitting method and calibrating the fluorescence intensity.
And the detection test piece manufacturing module 204 is used for carrying out layered stripping on the regenerated asphalt mixture to be detected to obtain a detection test piece.
The detection test piece manufacturing module 204 specifically includes:
and the asphalt extraction unit is used for sequentially placing the regenerated asphalt mixture to be detected in the plurality of extraction solutions, so that the regenerated asphalt of different layers of the regenerated asphalt mixture to be detected is respectively dissolved in the plurality of extraction solutions to obtain a plurality of asphalt dissolving solutions.
And the detection test piece manufacturing unit is used for air-drying and heating each asphalt dissolving solution to obtain a plurality of detection test pieces.
And the detection fluorescence intensity acquisition module 205 is configured to perform fluorescence microscopic analysis on the detection test piece to obtain the detection fluorescence intensity of the detection test piece.
The detection fluorescence intensity obtaining module 205 specifically includes:
and the detection fluorescence microscopic image acquisition unit is used for carrying out fluorescence microscopic analysis on the detection test piece to obtain a plurality of detection fluorescence microscopic images of the detection test piece.
And the detection gray image acquisition unit is used for respectively carrying out gray processing on the plurality of detection fluorescence microscopic images of the detection test piece to obtain a plurality of detection gray images of the detection test piece.
And the detection gray value calculation unit is used for calculating the gray value of each detection gray image.
And the detection fluorescence intensity calculating unit is used for calculating the average value of the gray values of the detection gray images of the detection test piece to obtain the average value of the detection gray values, and taking the average value of the detection gray values as the detection fluorescence intensity of the detection test piece.
And the fusion degree determining module 206 is configured to obtain the fusion condition of the new asphalt and the old asphalt in the regenerated asphalt mixture to be detected by using the regression equation of the detected fluorescence intensity and the fusion degree.
The embodiment also provides an application example of the method for determining the fusion degree of the recycled asphalt mixture:
1. raw material
In the application example, the asphalt mixture is a washing and planing material for the upper surface of a certain provincial road, and the new asphalt adopts modified asphalt (SBS I-D) of a certain brand. The technical indexes of the old asphalt and the new asphalt of the RAP sample after extraction test are shown in Table 1.
TABLE 1 technical indices of old and new bitumens
And (3) drying the RAP sample, and then performing a combustion screening test, wherein the aggregate grade of the RAP sample is shown in a table 2. Limestone is adopted as the new aggregate, and the grade composition of the new aggregate is shown in table 3.
TABLE 2 RAP sample aggregate grading
TABLE 3 novel aggregate grading
Two different warm-mixing agents are adopted, wherein the mixing amount of the warm-mixing agent 1 is 3% of the mass of the asphalt, and the mixing amount of the warm-mixing agent 2 is 5% of the mass of the asphalt. The technical indexes of the two warm-mixing agents are shown in Table 4.
TABLE 4 technical indices of two warm-mix agents
2. Delamination of recycled asphalt mixture to be detected
In order to distinguish the old aggregates in the regenerated asphalt mixture conveniently, the old aggregates are screened before a regeneration test is carried out, the old aggregates smaller than 9.5mm are taken to be subjected to warm-mixing regeneration with the new aggregates larger than 9.5mm and the new asphalt, and the regenerated asphalt mixture to be detected is obtained. In the regeneration test, the content of the old aggregate is 40 percent, and the consumption of the new asphalt is 3.5 percent. The hot recycling and the warm mixing recycling mainly refer to the production of recycled asphalt mixtures at different mixing temperatures. Asphalt is a viscoelastic material, the temperature needs to be raised to achieve the flowing state meeting the requirements of mixing and rolling, modified asphalt is generally used as new asphalt, the mixing temperature required by thermal regeneration is 170-180 ℃, and on the basis, the mixing temperature is reduced by 20-40 ℃, namely warm mixing regeneration. In order to make the asphalt reach the same flowing state at a lower temperature, a warm-mixing agent is generally required to be added during mixing, and different warm-mixing agents are adopted for different warm-mixing regeneration.
After stirring the RAP to be detected, sorting the reclaimed asphalt mixture to be detected with the particle size of less than 9.5mm from the reclaimed asphalt mixture to be detected, and taking 45 g. In order to prevent mineral powder from influencing the test, the filter cloth with the particle size of 400 meshes is used for wrapping the regenerated asphalt mixture to be detected during soaking. Preparing three beakers, respectively marking serial numbers, and corresponding to the outer, middle and inner three layers of the regenerated asphalt to be detected. About 75ml of tetrahydrofuran was injected into each beaker and used to dissolve the reclaimed asphalt coated on the surface of the RAP to be tested. When the layered stripping is carried out, the regenerated asphalt mixture to be detected, which is wrapped by the filter cloth, is respectively soaked in the three beakers in sequence, the soaking time in the first two beakers is kept to be the same, and the soaking time in the last beaker is properly prolonged until the regenerated asphalt, which is wrapped on the surface of the regenerated asphalt mixture to be detected, in the filter cloth is completely dissolved in tetrahydrofuran. And after the extraction of the regenerated asphalt is finished, placing the beaker in a fume hood for air drying, and after the liquid is evaporated until the liquid is invisible to human eyes, placing the beaker in an oven at 60 ℃ for heating for about 10 minutes to completely evaporate tetrahydrofuran in the beaker to obtain a regenerated asphalt sample.
Before the to-be-detected regenerated asphalt mixture is delaminated, a soaking time calibration experiment is carried out to determine the soaking time of the to-be-detected regenerated asphalt mixture in a beaker, so that the quality of each layer of the regenerated asphalt of the to-be-detected regenerated asphalt mixture is approximately the same after the delamination is finished. Four portions of RAP after heat regeneration, 45g each, were subjected to a delamination test. The soaking time of the four parts of RAP in the first two beakers is respectively 30s, 1min, 2min and 3min, namely the soaking time of the first part of RAP in the first two beakers is 30s, the soaking time of the second part of RAP in the first two beakers is 1min, the soaking time of the third part of RAP in the first two beakers is 2min, the soaking time of the fourth part of RAP in the first two beakers is 3min, and the four parts of RAP in the last beaker are soaked in the same way until the regenerated asphalt wrapped on the surface of the RAP is completely dissolved. And (4) extracting to obtain the quality of each layer of regenerated asphalt in each beaker, and comparing to determine the soaking time. The results of the soaking time calibration experiment are shown in fig. 5, and the soaking time adopted in the application example is 2 min.
After obtaining the regenerated asphalt sample, the beaker is placed in an oven at 165 ℃ and heated to a flowing state, the regenerated asphalt on the beaker is lightly scraped by a spatula and dropped on a glass slide, and the glass slide is lightly covered with a cover glass. Then, the slide glass is placed in an oven at 165 ℃ and heated for about 2 minutes, and a test piece with the thickness of about 1mm is obtained.
3. Fluorescence microscopy analysis method and parameter setting
When the fluorescence microscopic analysis was performed on the test piece, in order to clearly distinguish the new asphalt from the old asphalt, the emission wavelength of the fluorescence microscope was set to 450mm to 490mm, the light intensity was set to 12cd, the exposure time was set to 1s, and the magnification was 200 times. And converting the detection fluorescence microscopic image of each detection test piece into a detection gray image by using Matlab software, and quantitatively expressing the detection fluorescence intensity of the detection test piece by using the gray value of the detection gray image. The application example specifically calculates the gray values of five detection fluorescence microscopic images at different shooting positions of the same detection test piece, and takes the gray average value of the five detection gray images to represent the detection fluorescence intensity of the detection test piece.
4. Establishing a regression equation of fusion degree
Before establishing a fusion degree regression equation, in order to verify that the fluorescence intensity of the asphalt is not affected after the warm-mixed agent is added into the regenerated asphalt, comparing the gray average values of a plurality of fluorescence microscopic images of the new asphalt, the gray average values of a plurality of fluorescence microscopic images of the warm-mixed asphalt added with the warm-mixed agent 1 and the gray average values of a plurality of fluorescence microscopic images of the warm-mixed asphalt added with the warm-mixed agent 2, and obtaining a comparison result as shown in fig. 6, as can be seen from fig. 6, the gray average values of the warm-mixed asphalt added with the warm-mixed agent 1 and the warm-mixed agent 2 are 76.17 and 76.88, the gray average value of the new asphalt is 76.46, and the addition of the warm-mixed agent is considered not to affect the gray average value of the asphalt.
And calibrating the fluorescence intensity of the calibration test piece by obtaining the gray average value of a plurality of calibration gray images of the calibration test piece. And respectively mixing and melting the stripped old asphalt in the RAP sample with new asphalt according to the content of 0%, 20%, 40%, 60%, 80% and 100% by taking the content of 20% of the old asphalt as gradient increment at 165 ℃ to prepare a calibration test piece. And acquiring a plurality of calibration fluorescence microscopic images of the calibration test piece through a fluorescence microscope, and processing the calibration fluorescence microscopic images through Matlab software to calculate the gray level average value of the calibration gray level images.
Establishing a fusion degree regression equation: the calibrated fluorescence intensities of the multiple calibrated test pieces are compared with the old asphalt content, linear fitting is carried out, and a fusion degree regression equation is established, as shown in FIG. 7.
The expression of the regression equation for the degree of fusion is:
y＝-0.7035x+76.259 (1)
wherein x is the content of the old asphalt, and y is the average value of the calibration gray scale of the calibration test piece. Correlation R of fusion degree regression equation20.98, there is a good linear relationship. It can be seen that the fluorescence intensity of the calibration test piece is obviously different from that of the old asphalt, and the calibration gray level average value of the calibration test piece is higher, namely the fluorescence intensity of the calibration test piece is stronger. Regenerating along with the increase of the old asphalt content in the calibration test pieceThe gray level average value of the asphalt is gradually reduced, and the content of the old asphalt and the gray level average value of the regenerated asphalt are in a negative correlation relationship.
5. Layering evaluation to-be-detected recycled asphalt mixture
And (3) comparing the detection fluorescence intensity of each detection test piece with the fusion degree regression equation to obtain the content of the old asphalt in the regenerated asphalt mixture to be detected. Table 6 shows the old asphalt contents of the different recycled asphalt mixtures to be tested.
TABLE 6 old asphalt content in different recycled asphalt mixtures to be tested
For the three to-be-detected recycled asphalt mixtures in table 6, the old asphalt content in the to-be-detected recycled asphalt mixture shows a tendency of gradually decreasing from the inner layer to the outer layer in the thickness direction of the asphalt film; for the regenerated asphalt of the middle layer, the content of the old asphalt is about 40-50%, and the content of the old asphalt in the regenerated asphalt of the inner layer is less than 100%, which indicates that the new asphalt can be diffused into the inner layer of the old asphalt from the outer layer in the regeneration process and is integrally mixed with the old asphalt, but the mixing degree of the regenerated asphalt of each layer is different. Obviously, as the more new asphalt diffuses into the inner layer, the less the old asphalt content of the reclaimed asphalt in the inner layer, the higher the fusion efficiency of the reclaimed asphalt.
In the hot-recycling recycled asphalt mixture to be detected, the content of the old asphalt in the inner-layer recycled asphalt is 56.18%, and in comparison, the content of the old asphalt in the inner-layer recycled asphalt in the warm-mixing recycled asphalt mixture is higher, namely 59.01% and 72.93% respectively. The method shows that when the content of the asphalt mixture is 40%, more new asphalt can be effectively diffused into the inner layer of the old asphalt in the hot-regenerated asphalt mixture to be detected, and the fusion effect of the new asphalt and the old asphalt is better. For two warm-mix agents, namely the warm-mix agent 1 and the warm-mix agent 2, in the warm-mix recycled asphalt mixture using the warm-mix agent 2, most of new asphalt stays at the outer layer of old asphalt, the content of the old asphalt in the outer layer recycled asphalt is 11.21%, the content of the new asphalt is higher, and the new asphalt effectively diffused into the inner layer and blended with the old asphalt is less. In each layer of the regenerated asphalt using the warm-mixing agent 1, the contents of the middle-layer old asphalt and the inner-layer old asphalt are lower than those of the regenerated asphalt mixture to be detected using the warm-mixing agent 2, and are close to those of the regenerated asphalt mixture to be detected in the hot regeneration, but the content of the middle-layer regenerated asphalt is less than that of the old asphalt regenerated by the hot regeneration. Compared with the hot-recycling recycled asphalt mixture to be tested, the warm-mixing agent 1 is used for warm-mixing recycling, so that more new asphalt is diffused to the middle layer, and less new asphalt enters the inner layer to be blended with the old asphalt.
6. Comprehensive evaluation of new and old asphalt fusion effect
In the regeneration process, the new asphalt is mixed with the asphalt mixture and the new aggregate under the mechanical action of stirring at a certain temperature. In the thickness direction of the asphalt film, the new asphalt diffuses from the outside to the inside of the old asphalt wrapped on the RAP, and the new asphalt and the old asphalt are blended. When the fusion degree of the new asphalt and the old asphalt is higher, the proportion of the new asphalt diffusing into the old asphalt is higher, the content of the old asphalt in the inner layer regenerated asphalt in the regenerated asphalt mixture to be detected is lower, and the average gray level value of the regenerated asphalt wrapped in the inner layer of the RAP to be detected is higher until the new asphalt and the old asphalt are completely fused. Therefore, the fusion degree of the new and old asphalt in the regenerated asphalt mixture to be detected can be quantitatively evaluated by utilizing the ratio of the content of the old asphalt in the inner-layer regenerated asphalt sample to the content of the old asphalt when the new and old asphalt are completely fused.
When the new asphalt and the old asphalt are completely melted, the contents of the old asphalt in all layers of the regenerated asphalt in the regenerated asphalt mixture are completely the same. Assuming that the content of the new asphalt added in the regeneration test in the regenerated asphalt mixture is CVThe content of the old asphalt in the recycled asphalt mixture is CRWhen the asphalt is completely melted, the content C of the new asphalt in the inner-layer regenerated asphalt in the regenerated asphalt mixture is as follows:
when the new and old asphalts are partially fused, the content of the old asphalt in the inner-layer asphalt in the regenerated asphalt mixture is assumed to be C through fluorescence microscopic analysis3And the new and old asphalt fusion efficiency BE' in the inner layer regenerated asphalt mixture is shown as a formula (3):
and (3) calculating the fusion efficiency BE of the new asphalt and the old asphalt in the regenerated asphalt mixture by combining the formulas (2) and (3) as follows:
referring to fig. 8, it can be seen that the fusion efficiency of the new and old asphalt of the three to-be-tested recycled asphalt mixtures in table 6 is 67.81% under the condition that the content of the asphalt mixture is 40%, while the fusion efficiency of the to-be-tested recycled asphalt mixtures using warm-mix agent 1 and warm-mix agent 2 is 63.43% and 41.9%, respectively, which are lower than that of the to-be-tested recycled asphalt mixtures using warm-mix agent 1 and warm-mix agent 2.
The method comprises the steps of respectively manufacturing a detection test piece and a calibration test piece, calculating the proportion of new and old asphalt in the detection test piece according to the new and old asphalt proportion-fluorescence microscopic image gray average value relation of the calibration test piece, namely a fusion degree regression equation, and evaluating the fusion degree of the new and old asphalt in the regenerated asphalt mixture. The invention can conveniently and effectively microscopically analyze the fusion condition of the new and old asphalt in the regenerated asphalt mixture by combining a fluorescence microscopic analysis method and a layering stripping method, can compare the fusion effect of different regeneration processes on the new and old asphalt, and guides the selection and application of actual engineering to the regeneration process.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A method for determining the fusion degree of a recycled asphalt mixture is characterized by comprising the following steps:
extracting old asphalt in a regenerated asphalt mixture sample, and mixing the old asphalt and the new asphalt in different proportions to obtain a plurality of calibration test pieces;
performing fluorescence microscopic analysis on the calibration test piece to obtain the calibration fluorescence intensity of the calibration test piece;
obtaining a fusion degree regression equation by utilizing a linear fitting method and the calibrated fluorescence intensity;
carrying out layered stripping on the regenerated asphalt mixture to be detected to obtain a detection test piece;
carrying out fluorescence microscopic analysis on the detection test piece to obtain the detection fluorescence intensity of the detection test piece;
and obtaining the fusion condition of the new asphalt and the old asphalt in the to-be-detected regenerated asphalt mixture by using the detection fluorescence intensity and the fusion degree regression equation.
2. The method for determining the fusion degree of the recycled asphalt mixture according to claim 1, wherein the steps of extracting the old asphalt in the recycled asphalt mixture sample, and mixing the old asphalt with the new asphalt according to different proportions to obtain a plurality of calibration test pieces specifically comprise:
extracting old asphalt in the regenerated asphalt mixture sample by adopting a rotary evaporator method or an Abson method;
and mixing the old asphalt and the new asphalt according to different proportions of 0: 1-1: 1 to obtain a plurality of calibration test pieces.
3. The method for determining the fusion degree of the recycled asphalt mixture according to claim 1, wherein the fluorescence microscopic analysis of the calibration test piece to obtain the calibration fluorescence intensity of the calibration test piece specifically comprises:
performing fluorescence microscopic analysis on the calibration test piece to obtain a plurality of calibration fluorescence microscopic images of the calibration test piece;
respectively carrying out gray level processing on the plurality of calibrated fluorescence microscopic images of the calibrated test piece to obtain a plurality of calibrated gray level images of the calibrated test piece;
calculating the gray value of each calibration gray image;
and calculating the average value of the gray values of the calibration gray images of the calibration test piece to obtain a calibration gray average value, and taking the calibration gray average value as the calibration fluorescence intensity of the calibration test piece.
4. The method for determining the fusion degree of the recycled asphalt mixture according to claim 1, wherein the step of performing layered stripping on the recycled asphalt mixture to be detected to obtain a detection test piece specifically comprises the following steps:
sequentially placing the to-be-detected regenerated asphalt mixture into a plurality of extraction solutions, so that the regenerated asphalt of different layers of the to-be-detected regenerated asphalt mixture is respectively dissolved in the extraction solutions to obtain a plurality of asphalt dissolving solutions;
and air-drying and heating each asphalt dissolving solution to obtain a plurality of detection test pieces.
5. The method for determining the fusion degree of the reclaimed asphalt mixture according to claim 1, wherein the performing fluorescence microscopic analysis on the test specimen to obtain the detection fluorescence intensity of the test specimen specifically comprises:
performing fluorescence microscopic analysis on the detection test piece to obtain a plurality of detection fluorescence microscopic images of the detection test piece;
carrying out gray level processing on the multiple detection fluorescence microscopic images of the detection test piece respectively to obtain multiple detection gray level images of the detection test piece;
calculating a gray value of each of the detected gray images;
and calculating the average value of the gray values of the detection gray images of the detection test piece to obtain the average value of the detection gray values, and taking the average value of the detection gray values as the detection fluorescence intensity of the detection test piece.
6. A system for determining a fusion degree of a reclaimed asphalt mixture, comprising:
the calibration test piece manufacturing module is used for extracting old asphalt in a regenerated asphalt mixture sample, and mixing the old asphalt and the new asphalt in different proportions to obtain a plurality of calibration test pieces;
the calibration fluorescence intensity acquisition module is used for carrying out fluorescence microscopic analysis on the calibration test piece to obtain the calibration fluorescence intensity of the calibration test piece;
the fusion degree regression equation determining module is used for obtaining a fusion degree regression equation by utilizing a linear fitting method and the calibrated fluorescence intensity;
the detection test piece manufacturing module is used for carrying out layered stripping on the to-be-detected regenerated asphalt mixture to obtain a detection test piece;
the detection fluorescence intensity acquisition module is used for carrying out fluorescence microscopic analysis on the detection test piece to obtain the detection fluorescence intensity of the detection test piece;
and the fusion degree determining module is used for obtaining the fusion condition of the new asphalt and the old asphalt in the to-be-detected recycled asphalt mixture by using the detection fluorescence intensity and the fusion degree regression equation.
7. The system for determining the fusion degree of the recycled asphalt mixture according to claim 6, wherein the calibration test piece manufacturing module specifically comprises:
the old asphalt extraction unit is used for extracting old asphalt in the regenerated asphalt mixture sample by adopting a rotary evaporator method or an Abson method;
and the calibration test piece manufacturing unit is used for mixing and dissolving the old asphalt and the new asphalt according to different proportions of 0: 1-1: 1 to obtain a plurality of calibration test pieces.
8. The system for determining the fusion degree of recycled asphalt mixture according to claim 6, wherein the calibration fluorescence intensity obtaining module specifically comprises:
a calibration fluorescence microscopic image obtaining unit, configured to perform fluorescence microscopic analysis on the calibration test piece to obtain a plurality of calibration fluorescence microscopic images of the calibration test piece;
the gray processing unit is used for respectively carrying out gray processing on the plurality of calibrated fluorescence microscopic images of the calibrated test piece to obtain a plurality of calibrated gray images of the calibrated test piece;
the calibration gray value calculation unit is used for calculating the gray value of each calibration gray image;
and the calibration fluorescence intensity calculating unit is used for calculating the average value of the gray values of the calibration gray images of the calibration test piece to obtain a calibration gray average value, and taking the calibration gray average value as the calibration fluorescence intensity of the calibration test piece.
9. The system for determining the fusion degree of the reclaimed asphalt mixture according to claim 6, wherein the test piece manufacturing module specifically comprises:
the asphalt extraction unit is used for sequentially placing the to-be-detected regenerated asphalt mixture into a plurality of extraction solutions, so that the regenerated asphalt of different layers of the to-be-detected regenerated asphalt mixture is respectively dissolved in the extraction solutions to obtain a plurality of asphalt dissolving solutions;
and the detection test piece manufacturing unit is used for air-drying and heating each asphalt dissolving solution to obtain a plurality of detection test pieces.
10. The system for determining the fusion degree of recycled asphalt mixtures according to claim 6, wherein the detection fluorescence intensity obtaining module specifically comprises:
the detection fluorescence microscopic image acquisition unit is used for carrying out fluorescence microscopic analysis on the detection test piece to obtain a plurality of detection fluorescence microscopic images of the detection test piece;
the detection gray image acquisition unit is used for respectively carrying out gray processing on the multiple detection fluorescence microscopic images of the detection test piece to obtain multiple detection gray images of the detection test piece;
a detection gray value calculation unit for calculating a gray value of each of the detection gray images;
and the detection fluorescence intensity calculating unit is used for calculating the average value of the gray values of the detection gray images of the detection test piece to obtain the average value of the detection gray values, and taking the average value of the detection gray values as the detection fluorescence intensity of the detection test piece.
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| CN112162116B (en) * | 2020-10-10 | 2023-08-29 | 南京林业大学 | Characterization method of blending mechanism of epoxy emulsified asphalt and old asphalt on cold regenerated aggregate |
| CN114324983A (en) * | 2022-01-06 | 2022-04-12 | 同济大学 | Method and system for quantifying fusion degree of new asphalt and old asphalt in hot recycled asphalt mixture |
| CN114324983B (en) * | 2022-01-06 | 2023-09-22 | 同济大学 | Quantification method and system for new and old asphalt fusion degree in heat regeneration asphalt mixture |
| 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 |
| CN115452659A (en) * | 2022-11-11 | 2022-12-09 | 北京建筑大学 | Method for evaluating diffusion capacity of asphalt activator in old asphalt by utilizing image characteristics |
| CN115452659B (en) * | 2022-11-11 | 2023-01-17 | 北京建筑大学 | Method for evaluating diffusion capacity of asphalt activator in old asphalt by utilizing image characteristics |
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| CN111474157B (en) | 2021-07-30 |
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