CN109486221B - Method for determining using amount of waste SBS modified asphalt regenerant based on phase structure - Google Patents
Method for determining using amount of waste SBS modified asphalt regenerant based on phase structure Download PDFInfo
- Publication number
- CN109486221B CN109486221B CN201811332786.1A CN201811332786A CN109486221B CN 109486221 B CN109486221 B CN 109486221B CN 201811332786 A CN201811332786 A CN 201811332786A CN 109486221 B CN109486221 B CN 109486221B
- Authority
- CN
- China
- Prior art keywords
- sbs
- regenerant
- modified asphalt
- amount
- sbs modified
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/12—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring rising or falling speed of the body; by measuring penetration of wedged gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N21/6456—Spatial resolved fluorescence measurements; Imaging
- G01N21/6458—Fluorescence microscopy
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Pathology (AREA)
- Immunology (AREA)
- General Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Materials Engineering (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
- Road Repair (AREA)
Abstract
The invention provides a method for determining the using amount of a regenerant of waste SBS modified asphalt based on a phase structure parameter of SBS modified asphalt, namely SBS particle area rate, and combining penetration and ductility, so that the phase structure and the using performance of the waste SBS modified asphalt are restored to good levels, and the maximization of the using performance and economic benefit is realized.
Description
Technical Field
The invention relates to the technical field of recycling of asphalt pavements in road engineering, in particular to a method for determining the using amount of a waste SBS modified asphalt regenerant.
Background
In order to adapt to the conditions of high road traffic axle load, large flow, harsh use environment and the like in China, the modified asphalt is widely applied in China. Among a plurality of modified asphalts, SBS modified asphalt has good high temperature resistance and low temperature resistance, and particularly has good deformation resistance on highways with large flow and serious heavy load, so that SBS modified asphalt becomes a modified asphalt material with the widest application in China. The SBS modified asphalt is almost completely adopted on the expressway in China as the first layer of milling repair, the quantity of the waste SBS modified asphalt mixture milled every year is large, and therefore, the realization of the regeneration application of the waste SBS modified asphalt mixture is of great practical significance.
In order to recover the performance of the waste SBS modified asphalt to a proper level and ensure that the regenerated SBS modified asphalt has excellent service performance, an effective method is to add a certain amount of regenerant. Regarding the determination of the dosage of the SBS modified asphalt regenerant, the existing practice is to determine the dosage of the regenerant by performing a recycling test of the recycled modified asphalt through a trial-and-error method with reference to the base asphalt. The method specifically comprises the following steps: the recycling agent is mixed into the recycled modified asphalt according to the array proportion of the equal difference numbers at certain intervals, the indexes of the recycled modified asphalt, such as penetration degree, softening point, ductility and the like, are measured, and the using amount of the recycling agent is determined based on the performance of the target recycled asphalt. Indexes such as penetration, softening point, ductility and the like of the recycled asphalt are in a monotonous change relationship along with the increase of the using amount of the regenerant, or monotonously increase or monotonously decrease, namely, a performance peak value does not exist, the optimal using amount of the regenerant cannot be determined through the change of the indexes, and the maximization of the using performance and the economic benefit is realized. In addition, the recovery synchronism of the modified asphalt penetration and ductility by the regenerant is poor, namely the penetration and ductility of the modified asphalt are difficult to recover to the original modified asphalt level at the same time, and the increase of the dosage of the regenerant for improving the ductility can cause the remarkable improvement of the penetration on one hand, easily cause the diseases such as road surface flooding, rutting and the like, and can also cause the improvement of the engineering cost on the other hand, so that the original SBS modified asphalt performance is not suitable to be used as the target regeneration recovery level when the dosage of the regenerant is determined.
Unlike the base asphalt, the SBS modified asphalt is a multiphase composite material consisting of the styrene thermoplastic elastomer SBS and the base asphalt, and the performance of the SBS modified asphalt is influenced by the performance of the base asphalt and is closely related to the existing state of the polymer SBS in the asphalt. The SBS modified asphalt pavement can age after long-term operation, for SBS modified asphalt, the aging of the SBS modified asphalt comprises aging of polymer SBS in addition to aging of matrix asphalt, the phase structure of the polymer SBS inevitably changes, and instability of the phase structure inevitably leads to instability of performance of the SBS modified asphalt. It is not clear whether the SBS modified asphalt can effectively recover the phase state structure of the SBS modified asphalt by the method of determining the amount of the matrix asphalt regenerant. That is, there is no effective method for specifically determining the amount of the SBS modified asphalt recycling agent.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for determining the using amount of a regenerant of waste SBS modified asphalt based on the SBS particle area ratio which is a phase structure parameter of SBS modified asphalt.
Means for solving the technical problem
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for determining the using amount of a waste SBS modified asphalt regenerant based on a phase structure comprises the following steps:
(1) preparing waste SBS modified asphalt;
(2) mixing the regenerants with different dosages into the waste SBS modified asphalt to obtain an SBS modified asphalt mixture added with different dosages of the regenerants;
(3) measuring the corresponding SBS particle area rate, penetration degree and ductility of the SBS modified asphalt mixture with different regenerant dosages;
(4) determining the using amount A1 of the regenerant when the area ratio of SBS particles of the SBS modified asphalt mixture is maximum according to the result obtained in the step (3); respectively determining the using range B1 and the using amount A2 of the regenerant according to the penetration range and the ductility lower limit value required by the specification of the target model SBS modified asphalt; and
(5) and determining the final consumption of the regenerant of the waste SBS modified asphalt according to the relationship among the consumption A1 of the regenerant, the consumption range B1 of the regenerant and the consumption A2 of the regenerant.
Preferably, step (5) comprises:
when the using amounts A1 and A2 of the regenerants can be within the using amount range B1 of the regenerant corresponding to the penetration specification of the SBS modified asphalt of the target model, and the using amount A1 of the regenerant is more than or equal to the using amount A2 of the regenerant, taking the using amount A1 of the regenerant as the using amount of the regenerant of the waste SBS modified asphalt; and
and when the using amounts A1 and A2 of the regenerants can be within the using amount range B1 corresponding to the penetration specification of the target model SBS modified asphalt and the using amount A1 of the regenerant is less than the using amount A2 of the regenerant, taking the using amount A2 of the regenerant as the using amount of the regenerant of the waste SBS modified asphalt.
Preferably, in the step (5), when the regenerant dosage A1 and A2 fails to be within the regenerant dosage range B1 corresponding to the penetration specification of the target model SBS modified asphalt, the type of the regenerant is replaced, and the steps (1) to (5) are carried out again.
Preferably, the step of determining the SBS particle area ratio in the step (3) includes:
(3.1) observing the SBS modified asphalt mixture by an electron microscope to obtain at least 1 picture which can clearly see the phase structure distribution in the mixture;
and (3.2) analyzing and processing the picture by using image processing software to obtain the SBS particle area ratio of the SBS modified asphalt mixture.
Preferably, the SBS modified asphalt mixture is imaged on 4 pictures at different positions, and the SBS modified asphalt mixture is subjected to 4 parallel tests, so as to obtain 16 SBS particle area ratios, and the average value of the 16 SBS particle area ratios is used as the final SBS particle area ratio.
Preferably, the SBS particle area ratio is discarded when a difference between a certain SBS particle area ratio of the 16 SBS particle area ratios and the average value is greater than 1.15 times the standard deviation.
Preferably, the penetration test and the ductility test in the step (3) are performed according to road engineering asphalt and asphalt mixture sample specification (JTG E20-2011), and the specification in the step (4) is road asphalt pavement construction technical specification (JTG F40-2004).
Preferably, step (4) comprises: and respectively determining a relation curve of the dosage of the regenerant to the area rate of the SBS particles, a relation curve of the dosage of the regenerant to the penetration and a relation curve of the dosage of the regenerant to the ductility by taking the dosage of the regenerant as an abscissa or an ordinate and taking the area rate, the penetration and the ductility of the SBS particles as an ordinate or an abscissa.
Preferably, the relation curve of the dosage of the regenerant and the SBS particle area ratio is a smooth curve, if the relation curve of the dosage of the regenerant and the SBS particle area ratio has no peak value, the dosage range of the regenerant is expanded, and the steps (1) to (5) are carried out.
Preferably, step (1), step (2) and step (3) are carried out sequentially or alternately
Has the advantages that:
the invention provides a method for determining the using amount of a regenerant of waste SBS modified asphalt based on a phase structure parameter of SBS modified asphalt, namely SBS particle area rate, and combining penetration and ductility, so that the phase structure and the using performance of the waste SBS modified asphalt are restored to good levels, and the maximization of the using performance and economic benefit is realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the disclosed methods of the invention.
FIG. 1 is a graph showing the relationship between the amount of the recycling agent and the SBS particle area ratio of SBS modified asphalt.
FIG. 2 is a graph showing the relationship between the amount of the recycling agent and the penetration (25 ℃ C.) of SBS modified asphalt.
FIG. 3 is a graph showing the relationship between the amount of the recycling agent and the ductility (5 ℃ C.) of SBS modified asphalt.
Detailed Description
In the following detailed description, numerous specific details are set forth in order to provide a better understanding of the invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. Methods and means well known to those skilled in the art have not been described in detail so as not to obscure the present invention.
The SBS modified asphalt is a multiphase composite material consisting of polymer SBS and matrix asphalt, the polymer SBS swells in the matrix asphalt to realize physical structure compatibility, a spatial three-dimensional network structure is formed, and the service performance of the asphalt is finally improved. The polymer SBS in the SBS modified asphalt has the following characteristics: the polymer SBS absorbs light oil in the asphalt to form a polymer phase, light with longer wavelength is reflected under the excitation of fluorescence and is white, on the contrary, the asphalt phase does not emit any light and is black, and the asphalt phase and the polymer phase can be clearly distinguished through a fluorescence microscope. Because the reflected light field is adopted, the distribution form of the polymer phase in the asphalt is not damaged, and therefore, a large number of modified asphalt microscopic images with good reproducibility can be obtained by using a fluorescence microscope. Because of the advantages of simplicity, convenience, clarity and the like, the fluorescence microscope is one of the most important devices for researching the microstructure of SBS modified asphalt. The mechanical property of the modified asphalt can be effectively evaluated by directly observing the phase structure of the polymer SBS in the asphalt, and the method is the most direct means for evaluating the asphalt modification effect. The SBS polymer particle area ratio can be used as a quantitative evaluation index to characterize the phase structure characteristics of the modified asphalt.
Therefore, the invention provides a method for determining the using amount of a waste SBS modified asphalt regenerant based on the SBS modified asphalt phase structure parameter-SBS particle area ratio and combining penetration and ductility, and the method specifically comprises the following steps:
(1') "mixing" step
The waste SBS modified asphalt obtained by the recovery method is selected, a certain amount of regenerant is added into the waste SBS modified asphalt, and the mixture is slowly and uniformly stirred to obtain an SBS modified asphalt sample (namely, an SBS modified asphalt mixture).
(2') "SBS particle area fraction" test procedure
Washing the microscope slide and the cover glass with distilled water, drying in a 70 ℃ blast drying oven, and cooling in a drying dish for later use.
Dipping a SBS modified asphalt sample by using a clean glass rod, dripping one drop of SBS modified asphalt sample on a glass slide by means of self weight, taking a cover glass by using tweezers, and slightly placing the cover glass on the sample.
And flatly placing the sample into a constant-temperature oven at 140 ℃, immediately and carefully taking out the sample after the SBS modified asphalt sample is heated, melted and leveled, and placing the sample into a drying dish for cooling for later use. It should be noted that the sample is placed horizontally in the oven to avoid any tilt.
And opening an electronic microscope switch, placing the sample on a microscope objective table, opening the ultra-high pressure mercury lamp light source, and adjusting the position of the objective lens to align the sample.
And adjusting the height of the sample, finely adjusting the focal length of the microscope to clearly see the phase structure distribution in the sample, and then imaging by adopting an electron microscope with a CCD camera. The magnification is 400 times. The same sample needs to be imaged with 4 representative pictures at different positions.
And (3) analyzing and processing the picture by adopting Image-Pro Plus (IPP) Image processing software, opening the picture by using the IPP, and uniformly deepening the brightness of the picture.
And setting the contrast of the picture to ensure that the color difference of the SBS phase and the asphalt phase in the picture is obvious, and then additionally storing the picture as a binary image.
Opening the binary image by IPP, entering an HIS mode, carrying out segmentation processing on the image, continuously changing a red point (SBS phase) in the image in the process, comparing the image with the original image, taking the condition that the red point is adjusted to be similar to the original image as a reference, then stopping adjustment, and storing the image additionally.
Selecting a color matching option to change color identification, selecting a suction pipe tool, randomly clicking a white area in the picture, enabling white points to be all red at the moment, then quitting entering a calculation interface, selecting an area ratio as a calculation parameter, then calculating, and exporting a calculation result.
In the "SBS particle area ratio" test step, 4 parallel tests were performed on the same sample, that is, 4 slide samples were prepared and 16 measurement values were obtained for one sample. When a certain measurement value in a group of measurement values differs from the average value by more than 1.15 times the standard deviation, the measurement value should be discarded, and the average value of the remaining measurement values is taken as the test result.
(3') test procedure for "penetration and ductility
According to an asphalt penetration test (T0604-2011) and an ductility test (T0605-2011) in road engineering asphalt and asphalt mixture sample specifications (JTG E20-2011), the 25 ℃ penetration and 5 ℃ ductility of SBS modified asphalt are tested.
It should be noted that:
first, the mixing step and the SBS particle area rate testing step, the penetration test, and the ductility test may be performed in sequence. For example, all the required SBS modified asphalt samples are prepared, and then the SBS granule area ratio test, the penetration test and the ductility test are carried out.
Second, the mixing step and the SBS particle area rate testing step, the penetration test, and the ductility test step may be alternately performed. For example, a part of the SBS modified asphalt sample is prepared, and one or two of the SBS particle area ratio test, penetration test, and ductility test are performed, and a part of the SBS modified asphalt sample is prepared, and the rest of the tests are performed.
Third, the SBS particle area ratio test, the penetration test and the ductility test may be performed simultaneously or sequentially. Preferably, the three tests are performed simultaneously to ensure the accuracy of the final result.
(4') SBS granule area ratio test, penetration and ductility test procedure under other dosage
By referring to the steps, the SBS particle area ratio, the penetration at 25 ℃ and the ductility at 5 ℃ of the waste SBS modified asphalt added with other dosages of the regenerant are tested.
(5') establishing and analyzing the variation model of SBS modified asphalt property
And (3) taking the dosage of the regenerant as a horizontal coordinate, taking the SBS particle area rate, the penetration at 25 ℃ and the ductility at 5 ℃ as a vertical coordinate, pointing the test results into a graph, and connecting points in the coordinates into smooth curves so as to form a regenerant dosage-SBS particle area rate relation curve, a regenerant dosage-penetration relation curve and a regenerant dosage-ductility relation curve of the waste SBS modified asphalt.
The regenerant dosage A1 corresponding to the maximum value of the SBS particle area rate of the SBS modified asphalt is obtained on a regenerant dosage-SBS particle area rate relation curve; solving a regenerant dosage range B1 corresponding to the range required by the target model SBS modified asphalt penetration specification on a regenerant dosage-penetration relation curve; and solving the regenerant dosage A2 corresponding to the lower limit value required by the ductility specification of the target model SBS modified asphalt on the regenerant dosage-ductility relation curve.
Among these, those skilled in the art will understand that:
first, the term "specification" herein means: specifications for asphalt road pavement construction technology for highways (JTG F40-2004), section 4.6.2, the "technical requirements for polymer modified asphalt".
Secondly, the relationship curve of the dosage of the regenerant and the SBS particle area ratio should have a peak value, and if the peak value does not appear, the dosage range of the regenerant must be expanded for retesting. The term "expanding the range of the amount of the regenerant" as used herein means: the minimum value of the amount of regenerant selected for the subsequent test should be less than the minimum value of the amount of regenerant selected for the previous test, and/or the maximum value of the amount of regenerant selected for the subsequent test should be greater than the maximum value of the amount of regenerant selected for the previous test.
(6') Final regenerant dosing step
When the using amounts A1 and A2 of the regenerants can be covered in a regenerant using amount range B1 corresponding to the penetration specification of the SBS modified asphalt of the target model, and the using amount A1 of the regenerants is more than or equal to the using amount A2 of the regenerants, taking the using amount A1 of the regenerants as the using amount of the regenerants of the waste SBS modified asphalt; on the contrary, if the using amount of the regenerant A1 is less than the using amount of the regenerant A2, the using amount of the regenerant A2 is taken as the using amount of the regenerant of the waste SBS modified asphalt; when the regenerant dosage A1 and A2 are not covered in the regenerant dosage range B1 corresponding to the penetration specification of the target model SBS modified asphalt, the steps are carried out again in consideration of the type of the regenerant to be replaced.
The foregoing process is further illustrated by the following examples:
1. washing the microscope slide and the cover glass with distilled water, drying in a 70 ℃ blast drying oven, and cooling in a drying dish for later use.
2. Approximately 130g of waste SBS modified asphalt with the amount of the regenerant to be determined is selected, 6 percent of the regenerant (about 7.8g) is added into the heated waste SBS modified asphalt according to the mass ratio of the waste SBS modified asphalt, and the mixture is slowly and uniformly stirred.
3. Dipping SBS modified asphalt with a clean glass rod, dropping one drop on a glass slide by means of self weight, taking a cover glass with tweezers and lightly placing the cover glass on a sample.
4. And flatly placing the sample into a constant-temperature oven at 140 ℃, immediately and carefully taking out the sample after the SBS modified asphalt sample is heated, melted and leveled, and placing the sample into a drying dish for cooling for later use. It should be noted that the sample is placed horizontally in the oven to avoid any tilt.
5. And opening an electronic microscope switch, placing the sample on a microscope objective table, opening the ultra-high pressure mercury lamp light source, and adjusting the position of the objective lens to align the sample.
6. And adjusting the height of the sample, finely adjusting the focal length of the microscope to clearly see the phase structure distribution in the sample, and then imaging by adopting an electron microscope with a CCD camera. The magnification is 400 times. The same sample needs to be imaged with 4 representative pictures at different positions.
7. And (3) analyzing and processing the picture by adopting Image-Pro Plus (IPP) Image processing software, opening the picture by using the IPP, and uniformly deepening the brightness of the picture.
8. And setting the contrast of the picture to ensure that the color difference of the SBS phase and the asphalt phase in the picture is obvious, and then additionally storing the picture as a binary image.
9. Opening the binary image by IPP, entering an HIS mode, carrying out segmentation processing on the image, continuously changing a red point (SBS phase) in the image in the process, comparing the image with the original image, taking the condition that the red point is adjusted to be similar to the original image as a reference, then stopping adjustment, and storing the image additionally.
10. Selecting a color matching option to change color identification, selecting a suction pipe tool, randomly clicking a white area in the picture, enabling white points to be all red at the moment, then quitting entering a calculation interface, selecting an area ratio as a calculation parameter, then calculating, and exporting a calculation result.
11. The same specimen is subjected to 4 parallel tests, i.e., 4 slide samples are prepared, and 16 measurement values are obtained for one specimen. When a certain measurement value in a group of measurement values differs from the average value by more than 1.15 times the standard deviation, the measurement value should be discarded, and the average value of the remaining measurement values is taken as the test result.
12. Meanwhile, according to asphalt penetration and ductility tests in road engineering asphalt and asphalt mixture sample specification (JTG E20-2011), the 25 ℃ penetration and 5 ℃ ductility of SBS modified asphalt are tested.
13. Then, referring to the steps, the SBS particle area ratio, the penetration at 25 ℃ and the ductility at 5 ℃ of the waste SBS modified asphalt added with the regenerants in the amounts of 0%, 3%, 9% and 12% are tested.
14. The test results are plotted in a graph by using the dosage of the regenerant as an abscissa and the SBS particle area ratio, the penetration at 25 ℃ and the ductility at 5 ℃ as ordinates, and are connected into a smooth curve.
15. The test results are shown in FIGS. 1 to 3. The regenerated target of the waste SBS modified asphalt is drawn to be I-D, and the test result after regeneration shows that the SBS particle area rate of the SBS modified asphalt has a peak value under the condition of the given regenerant dosage, and the corresponding regenerant dosage A1 is 6.0 percent; the specification requirement of the penetration degree at 25 ℃ of the I-D type SBS modified asphalt is 40-60 (unit: 0.1mm), and the dosage of the regenerant corresponding to the specification requirement of the penetration degree is 2.4-9.3%; the standard requirement of 5 ℃ ductility of the I-D type SBS modified asphalt is as follows: not less than 20cm, and 5.2% of regenerant A2 corresponding to the lower limit of the specification range requirement of 20 cm.
16, A1 and A2 can be covered in the range of the regenerant dosage corresponding to the requirement of the target model SBS modified asphalt penetration specification, and A1 is larger than A2, therefore, the A1 is taken as the regenerant dosage of the waste SBS modified asphalt, namely the final regenerant dosage of the waste SBS modified asphalt is 6.0%, and the penetration at 25 ℃ and the ductility at 5 ℃ meet the requirements of the current specification.
Embodiments of the present invention have been described above, and the above description is exemplary and not exhaustive. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments. The terminology used herein is chosen to best explain the method or practical engineering application of the embodiments, or to enable others of ordinary skill in the art to understand the disclosed embodiments of the present invention.
Claims (8)
1. A method for determining the using amount of a waste SBS modified asphalt regenerant based on a phase structure is characterized by comprising the following steps:
(1) preparing waste SBS modified asphalt;
(2) mixing the regenerants with different dosages into the waste SBS modified asphalt to obtain an SBS modified asphalt mixture added with different dosages of the regenerants;
(3) measuring the corresponding SBS particle area rate, penetration degree and ductility of the SBS modified asphalt mixture with different regenerant dosages;
(4) determining the using amount A1 of the regenerant when the area ratio of SBS particles of the SBS modified asphalt mixture is maximum according to the result obtained in the step (3); respectively determining the using range B1 and the using amount A2 of the regenerant according to the penetration range and the ductility lower limit value required by the specification of the target model SBS modified asphalt; and
(5) determining the final regenerant dosage of the waste SBS modified asphalt according to the relationship among the regenerant dosage A1, the regenerant dosage range B1 and the regenerant dosage A2, and specifically comprising the following steps:
when the using amounts A1 and A2 of the regenerants can be within the using amount range B1 of the regenerant corresponding to the penetration specification of the SBS modified asphalt of the target model, and the using amount A1 of the regenerant is more than or equal to the using amount A2 of the regenerant, taking the using amount A1 of the regenerant as the using amount of the regenerant of the waste SBS modified asphalt;
when the using amounts A1 and A2 of the regenerants can be within the using amount range B1 corresponding to the penetration specification of the SBS modified asphalt of the target model, and the using amount A1 of the regenerants is less than the using amount A2 of the regenerants, taking the using amount A2 of the regenerants as the using amount of the regenerants of the waste SBS modified asphalt; and
and (3) when the dosage of the regenerants A1 and A2 is not in the dosage range B1 corresponding to the penetration specification of the target model SBS modified asphalt, replacing the type of the regenerant, and repeating the steps (1) to (5).
2. The method according to claim 1, wherein the step of determining the SBS particle area ratio in step (3) comprises:
(3.1) observing the SBS modified asphalt mixture by an electron microscope to obtain at least 1 picture which can clearly see the phase structure distribution in the mixture;
and (3.2) analyzing and processing the picture by using image processing software to obtain the SBS particle area ratio of the SBS modified asphalt mixture.
3. The method according to claim 2, wherein said SBS modified asphalt mixture is imaged on 4 said pictures at different positions and said SBS modified asphalt mixture is subjected to 4 parallel tests to obtain 16 SBS granule area ratios, and the average of said 16 SBS granule area ratios is taken as the final SBS granule area ratio.
4. The method according to claim 3, wherein the SBS particle area fraction is discarded when the SBS particle area fraction differs from the mean by more than 1.15 times the standard deviation of the 16 SBS particle area fractions.
5. The method of claim 1, wherein the penetration test and the ductility test in step (3) are performed according to road engineering asphalt and asphalt mixture test specification (JTG E20-2011), and the specification in step (4) is road asphalt pavement construction technical specification (JTG F40-2004).
6. The method of claim 1, wherein step (4) comprises: and respectively determining a relation curve of the dosage of the regenerant to the area rate of the SBS particles, a relation curve of the dosage of the regenerant to the penetration and a relation curve of the dosage of the regenerant to the ductility by taking the dosage of the regenerant as an abscissa or an ordinate and taking the area rate, the penetration and the ductility of the SBS particles as an ordinate or an abscissa.
7. The method as claimed in claim 6, wherein the relationship between the amount of the recycling agent and the SBS particle area ratio is a smooth curve, and if the relationship between the amount of the recycling agent and the SBS particle area ratio has no peak, the range of the amount of the recycling agent is expanded, and the steps (1) to (5) are performed.
8. The method of claim 1, wherein step (1), step (2) and step (3) are performed sequentially or alternately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811332786.1A CN109486221B (en) | 2018-11-09 | 2018-11-09 | Method for determining using amount of waste SBS modified asphalt regenerant based on phase structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811332786.1A CN109486221B (en) | 2018-11-09 | 2018-11-09 | Method for determining using amount of waste SBS modified asphalt regenerant based on phase structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109486221A CN109486221A (en) | 2019-03-19 |
| CN109486221B true CN109486221B (en) | 2021-04-20 |
Family
ID=65694094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811332786.1A Active CN109486221B (en) | 2018-11-09 | 2018-11-09 | Method for determining using amount of waste SBS modified asphalt regenerant based on phase structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109486221B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112082895B (en) * | 2020-09-18 | 2021-09-21 | 山东大学 | Method for determining effective recovery rate of old asphalt and correcting consumption of new asphalt |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100317436B1 (en) * | 1999-08-02 | 2001-12-22 | 박승범 | A Manufacturing Methods of High Function Recycled Asphalt Concrete Mixtures using Crumb Rubber and Polymer Modifier for Pavement |
| CN102010518A (en) * | 2010-12-03 | 2011-04-13 | 杨世英 | Regeneration of waste SBS (styrene butadiene styrene) modified asphalt mixture |
| CN103739872B (en) * | 2013-12-27 | 2016-07-06 | 江苏宝利沥青股份有限公司 | A kind of waste and old SBS regenerating modified asphalt Application way |
-
2018
- 2018-11-09 CN CN201811332786.1A patent/CN109486221B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109486221A (en) | 2019-03-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Sengoz et al. | Morphology and image analysis of polymer modified bitumens | |
| Pan et al. | Effect of coarse aggregate morphology on permanent deformation behavior of hot mix asphalt | |
| Fletcher et al. | Aggregate imaging system for characterizing the shape of fine and coarse aggregates | |
| Behnood et al. | High-temperature properties of asphalt binders: Comparison of multiple stress creep recovery and performance grading systems | |
| Arasan et al. | Correlation between shape of aggregate and mechanical properties of asphalt concrete: Digital image processing approach | |
| CN107121440B (en) | Method for detecting and evaluating aggregate distribution uniformity of asphalt pavement | |
| Pan et al. | Effect of coarse aggregate morphology on the resilient modulus of hot-mix asphalt | |
| Mahmoud et al. | Experimental methods for the evaluation of aggregate resistance to polishing, abrasion, and breakage | |
| CN109486221B (en) | Method for determining using amount of waste SBS modified asphalt regenerant based on phase structure | |
| Hamzah et al. | Use of imaging technique and direct tensile test to evaluate moisture damage properties of warm mix asphalt using response surface method | |
| Cavalli et al. | Multiscale imaging and characterization of the effect of mixing temperature on asphalt concrete containing recycled components | |
| CN108195721B (en) | Method for testing diffusion coefficients among different asphalts | |
| Lantieri et al. | Use of image analysis for the evaluation of rolling bottle tests results | |
| Jiang et al. | Effect of binder film distribution on the fatigue characteristics of asphalt Binder/Filler composite based on image analysis method | |
| Xiao et al. | Measuring moisture damage of hot-mix asphalt (HMA) by digital imaging-assisted modified boiling test (ASTM D3625): Recent advancements and further investigation | |
| Hao et al. | 3D reconstruction of polymer phase in polymer-modified asphalt using confocal fluorescence microscopy | |
| CN111626529A (en) | Method for evaluating dispersion degree of RAP in recycled asphalt mixture | |
| Yang et al. | Evaluating reclaimed asphalt mixture homogeneity using force chain transferring stress efficiency | |
| Zhang et al. | Material optimization and optimum asphalt content design of asphalt mixture in salty and humid environment | |
| CN108181211A (en) | A kind of evaluation method of the compound geometrical property of mineral aggregate coarse aggregate | |
| Shi et al. | Image processing of aggregate skeleton structure of asphalt mixture for aggregate uniformity quantification | |
| Alvarez et al. | Adhesion quality of chip seals: Comparing and correlating the plate-stripping test, boiling-water test, and energy parameters from surface free energy | |
| Yeggoni et al. | Fractals of aggregates correlated with creep in asphalt concrete | |
| CN111863144B (en) | Asphalt and modifier compatibility evaluation method based on interface interaction | |
| Tielmann et al. | Air void analyses on asphalt specimens using plane section preparation and image analysis |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |