CN113092312A - Evaluation method for aging gradient behavior of SBS modified asphalt - Google Patents
Evaluation method for aging gradient behavior of SBS modified asphalt Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 227
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- 230000002431 foraging effect Effects 0.000 title description 2
- 238000012360 testing method Methods 0.000 claims abstract description 81
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- 230000032683 aging Effects 0.000 claims abstract description 41
- 238000004458 analytical method Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 28
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- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 15
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 claims description 15
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 14
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- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 7
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- 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
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- 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
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- 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
- G01N11/14—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
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- 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
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- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
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- 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
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/04—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of melting point; of freezing point; of softening point
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Abstract
The invention discloses an evaluation method of SBS modified asphalt aging gradient behavior, which is based on recovered naturally aged SBS modified asphalt, takes the gradient behavior of SBS modified asphalt in the natural aging process into consideration, carries out layering treatment and layering analysis on SBS modified asphalt mixture core sample, and sets a blank test to reduce test error caused by irregular operation in consideration of the complexity of the asphalt recovery process. In addition, the evaluation method comprehensively evaluates the gradient behavior of the SBS modified asphalt in a natural aging state from the macroscopic performance and the microscopic performance, the evaluation of the gradient behavior of the SBS modified asphalt by the comprehensive index is more accurate and reliable, and the evaluation method is simple and feasible. Therefore, the aging state of the SBS modified asphalt under natural conditions can be accurately reflected through the evaluation method, and the aging gradient behavior of the SBS modified asphalt evaluated by the method is more reliable.
Description
Technical Field
The invention relates to the technical field of road materials, in particular to an evaluation method of SBS modified asphalt aging gradient behavior.
Background
At present, the aging evaluation method of SBS modified asphalt is based on accelerated aging evaluation or based on the whole pavement evaluation of the aging degree of SBS modified asphalt. However, under the action of natural aging, SBS modified asphalt is affected by multiple factors, and the aging behavior is not completely consistent with accelerated aging. Since the gradient behavior of the SBS modified asphalt exists in the natural aging process, if the aging condition of the whole SBS modified asphalt pavement is replaced by accelerated aging, the design and maintenance of the road are unreasonable, and therefore, the method for accurately and reliably evaluating the aging gradient of the SBS modified asphalt is urgent.
Disclosure of Invention
The invention provides an evaluation method of SBS modified asphalt aging gradient behavior, which is used for overcoming the defects that in the prior art, aging is accelerated to replace the whole aging condition of an SBS modified asphalt pavement, so that the design and maintenance of a road are unreasonable and the like.
In order to achieve the purpose, the invention provides an evaluation method of the aging gradient behavior of SBS modified asphalt, which comprises the following steps:
obtaining SBS modified asphalt mixture core samples with different service lives, and carrying out layering treatment on the SBS modified asphalt mixture core samples to obtain SBS modified asphalt mixtures with different service lives and different layers;
setting a blank test of asphalt extraction and recovery, performing penetration test, softening point test, ductility test and Brookfield rotational viscosity test on the asphalt extracted and recovered in the blank test and the original asphalt, and comparing the test results of the extracted and recovered asphalt and the original asphalt;
if the comparison result exceeds the set threshold value, repeating the blank test until the comparison result is less than or equal to the set threshold value; if the comparison result is less than or equal to the set threshold value, respectively carrying out asphalt extraction and recovery on the SBS modified asphalt mixture of the same service life and the same layer according to the blank test process;
carrying out a plurality of performance analysis tests on the SBS modified asphalt which is extracted and recovered, wherein the performance analysis tests comprise a temperature scanning test, a bending beam rheometer test, infrared spectrum analysis and fluorescence microscope analysis;
and evaluating the aging gradient behavior of the SBS modified asphalt according to the performance analysis test results and the blank test results.
Compared with the prior art, the invention has the beneficial effects that:
the evaluation method of the aging gradient behavior of the SBS modified asphalt provided by the invention is based on the recycled naturally aged SBS modified asphalt, takes the gradient behavior of the SBS modified asphalt in the natural aging process into consideration, carries out layering treatment and layering analysis on the SBS modified asphalt mixture core sample, and simultaneously sets a blank test in consideration of the complexity of the asphalt recycling process so as to reduce the test error caused by the irregular operation. In addition, the evaluation method for the aging gradient behavior of the SBS modified asphalt provided by the invention comprehensively evaluates the gradient behavior of the SBS modified asphalt in a natural aging state from the macroscopic performance and the microscopic performance, the evaluation of the gradient behavior of the SBS modified asphalt by the comprehensive index is more accurate and reliable, and the evaluation method is simple and feasible. Therefore, the aging state of the SBS modified asphalt under natural conditions can be accurately reflected through the evaluation method, and the aging gradient behavior of the SBS modified asphalt evaluated by the method is more reliable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flow chart of the method for evaluating the aging gradient behavior of SBS modified asphalt provided by the present invention;
FIG. 2 is a photograph of a sample of SBS modified asphalt mixture;
FIG. 3 is a photograph of a layered SBS modified asphalt mixture core sample;
FIG. 4 is a plot of the complex shear modulus and phase angle results for the SBS modified asphalt of example 1;
FIG. 5 is a graph of rut factor results for SBS modified asphalt of example 1;
FIG. 6 is a diagram showing the distribution of SBS modifier in SBS modified asphalt of the upper, middle and lower layers in example 1; wherein, a is a distribution state diagram of the SBS modifier in the upper SBS modified asphalt, b is a distribution state diagram of the SBS modifier in the middle SBS modified asphalt, and c is a distribution state diagram of the SBS modifier in the lower SBS modified asphalt.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The drugs/reagents used are all commercially available without specific mention.
The invention provides an evaluation method of SBS modified asphalt aging gradient behavior, as shown in figure 1, comprising the following steps:
101: obtaining SBS modified asphalt mixture core samples with different service lives, as shown in figure 2, and carrying out layering treatment on the SBS modified asphalt mixture core samples to obtain SBS modified asphalt mixtures with different service lives and different layers, as shown in figure 3;
because the SBS modified asphalt has gradient behavior in the natural aging process, in order to evaluate the aging gradient behavior of the SBS modified asphalt more accurately, the invention carries out layered treatment and layered analysis on the SBS modified asphalt mixture core sample.
102: setting a blank test of asphalt extraction and recovery, performing penetration test, softening point test, ductility test and Brookfield rotational viscosity test on the asphalt extracted and recovered in the blank test and the original asphalt, and comparing the test results of the extracted and recovered asphalt and the original asphalt;
bitumen as received refers to the bitumen sample used for the blank test.
103: if the comparison result exceeds the set threshold value, repeating the blank test until the comparison result is less than or equal to the set threshold value; if the comparison result is less than or equal to the set threshold value, respectively carrying out asphalt extraction and recovery on the SBS modified asphalt mixture of the same service life and the same layer according to the blank test process;
the comparison result exceeds a set threshold value, which means that the test results of the extracted and recovered asphalt and the original asphalt have larger difference.
The comparison result is less than or equal to the set threshold value, which means that the difference between the test results of the extracted and recovered asphalt and the test results of the original asphalt is small.
104: carrying out a plurality of performance analysis tests on the SBS modified asphalt which is extracted and recovered, wherein the performance analysis tests comprise a temperature scanning test, a bending beam rheometer test, infrared spectrum analysis and fluorescence microscope analysis;
105: and evaluating the aging gradient behavior of the SBS modified asphalt according to the performance analysis test results.
In one embodiment, 10-15 SBS modified asphalt mixture core samples are taken for each service life for step 101 to ensure the accuracy of the evaluation.
In another embodiment, for step 101, the SBS modified asphalt mixture core sample is subjected to a layering process comprising:
and cutting the SBS modified asphalt mixture core sample into an upper layer, a middle layer and a lower layer by using a cutting machine, wherein the thickness of each layer is 8-12 mm.
In order to make the obtained SBS modified asphalt mixture have contrast, the SBS modified asphalt mixture core needs to be accurately layered. Because the cutting machine is not accurate enough to the cutting of cylindricality test piece, consequently handle the cushion of cutting machine, make it can be accurate with the layering of SBS modified asphalt mixture core.
In a next embodiment, for step 102, the blank test comprises the steps of:
selecting original asphalt and mineral powder, and preparing asphalt mucilage with a mucilage ratio of 0.8; the original asphalt is SBS modified asphalt;
dissolving asphalt mucilage in trichloroethylene, and standing until asphalt in the asphalt mucilage is completely dissolved in the trichloroethylene;
putting the obtained solution into a centrifugal machine for centrifugation to remove mineral powder in the solution and obtain an asphalt solution;
and (4) carrying out rotary evaporation on the asphalt solution to obtain the extracted and recovered asphalt.
In the process of extracting and recovering SBS modified asphalt, firstly, the old asphalt is ensured not to generate further aging behavior, and secondly, mineral powder and trichloroethylene solvent are removed as much as possible, so that the performance of the old asphalt can be accurately reflected by a recovered asphalt sample. The centrifugal separation method has the advantages of simple operation, strong repeatability of the test process, small error and the like; the rotary evaporation method has the advantages of simple operation, simple operation of recycling the asphalt, difficult occurrence of further aging of the old asphalt and the like, so the method adopts the centrifugal separation method and the rotary evaporator method to recycle the asphalt in the pavement.
Blank tests were set to reduce test errors due to out-of-specification operation, taking into account the complexity of the bitumen recovery process.
In one embodiment, considering that the bitumen solution obtained in the centrifuge contains a small amount of fines, the bitumen solution is subjected to a fines removal process prior to the rotary evaporation of the bitumen solution, which comprises:
placing the asphalt solution in a beaker, and standing for 24 hours;
and taking the upper layer 2/3 solution of the settled asphalt solution, placing the solution in another new beaker, continuing to settle for 24 hours, and taking the upper layer 2/3 solution to obtain a pure asphalt solution.
In another embodiment, for step 103, the asphalt extraction and recovery of the SBS modified asphalt mixture at the same age and the same layer are performed according to the blank test process, which includes:
weighing 1000-1500 g of SBS modified asphalt mixture with the same service life and the same layer, putting the mixture into an oven, and heating the mixture to be in a loose state, wherein the temperature of the oven is less than 100 ℃, and the heating time is not more than 30 min;
dissolving the loosened SBS modified asphalt mixture in trichloroethylene, and soaking for 30-35 min;
centrifuging the obtained solution in a centrifuge to remove mineral powder in the solution, and taking upper-layer liquid;
adding trichloroethylene into the centrifuged sediment continuously (the amount of the trichloroethylene is the same as that of the trichloroethylene added for the first time), soaking for 15-20 min, centrifuging, and taking the upper-layer liquid;
continuously adding the trichloroethylene into the centrifuged sediment, soaking, centrifuging and taking the upper liquid until the obtained upper liquid is light yellow;
mixing all the upper layer liquids to obtain an extracted and recovered SBS modified asphalt solution;
and carrying out rotary evaporation on the SBS modified asphalt solution to obtain the extracted and recovered SBS modified asphalt.
In one embodiment, the method for extracting and recovering SBS modified asphalt comprises the following steps:
putting 350-400 ml of SBS modified asphalt solution into 1000ml of rotary flask; care should be taken at this point not to pour too much solution into the spinner flask to avoid suck back of solution.
Starting a vacuum pump to enable a rotary evaporation system to form negative pressure, wherein the vacuum degree is 94.7KPa, starting a rotary flask at the speed of 35-45 r/min, and immersing the rotary flask into an oil bath at the temperature of 45-50 ℃;
when no solvent is condensed, the distillation is finished, the rotating speed of the rotary flask is reduced to 15-20 r/min, the oil bath temperature is increased to 155 ℃ and kept for 15min, and then CO is opened2And (4) turning off a gas valve when no residual trichloroethylene exists in the flask, and collecting the SBS modified asphalt.
In the next example, considering that the SBS modified asphalt solution obtained in the centrifugal separator contains a small amount of ore powder, the SBS modified asphalt solution is subjected to an ore powder removing process before rotary evaporation of the SBS modified asphalt solution, which includes:
placing the SBS modified asphalt solution in a beaker, and standing for 24 hours;
and (3) taking the upper layer 2/3 solution of the SBS modified asphalt solution after standing, placing the solution in another new beaker (the lower layer 1/3 is discarded), continuously standing for 24 hours, and taking the upper layer 2/3 solution to obtain a pure SBS modified asphalt solution.
In one embodiment, for step 104, the SBS modified asphalt that is extracted for recovery is subjected to several performance analysis tests, including:
carrying out a temperature scanning test on the extracted and recovered SBS modified asphalt to obtain a plurality of shear moduli, phase angles and rutting factors of the SBS modified asphalt for evaluating the high-temperature performance of the SBS modified asphalt;
performing a bending beam rheometer test on the SBS modified asphalt recovered by extraction to obtain stiffness modulus and creep rate for evaluating the low-temperature performance of the SBS modified asphalt;
carrying out infrared spectrum analysis on the SBS modified asphalt which is extracted and recovered, and calculating to obtain the carbonyl index and the butadiene index of the SBS modified asphalt;
and (3) carrying out fluorescence microscope analysis on the extracted and recovered SBS modified asphalt so as to observe the distribution state of the SBS modifier in the SBS modified asphalt.
In one embodiment, the SBS modified asphalt is subjected to infrared spectrum analysis, the carbonyl index and the butadiene index of the SBS modified asphalt are obtained by calculating through the formula (1) and the formula (2),
example 1
The embodiment provides an evaluation method of an aging gradient behavior of SBS modified asphalt, which comprises the following steps:
(1) and obtaining SBS modified asphalt mixture core samples with different service lives, and carrying out layering treatment on the SBS modified asphalt mixture core samples to obtain SBS modified asphalt mixtures with different service lives and different layers.
In the embodiment, the SBS modified asphalt mixture core sample is an SBS modified asphalt mixture core sample which is obtained on a highway in Hunan province and is in service for 5 years, and 10-15 parts of the SBS modified asphalt mixture core sample which is in service for 5 years is obtained by core drilling and sampling.
And (3) carrying out layering treatment on each SBS modified asphalt mixture core sample, wherein the SBS modified asphalt mixture core sample is divided into an upper layer, a middle layer and a lower layer, and the thickness of each layer is 10 mm.
And mixing the SBS modified asphalt mixture at the same layer to obtain 3 parts of SBS modified asphalt mixture, namely the upper SBS modified asphalt mixture, the middle SBS modified asphalt mixture and the lower SBS modified asphalt mixture.
(2) Setting a blank test of asphalt extraction and recovery, carrying out penetration test, softening point test, ductility test and Brookfield rotational viscosity test on the asphalt extracted and recovered in the blank test and the original asphalt, and comparing the test results of the extracted and recovered asphalt and the original asphalt.
(3) If the comparison result exceeds the set threshold value, repeating the blank test until the comparison result is less than or equal to the set threshold value; and if the comparison result is less than or equal to the set threshold, respectively carrying out asphalt extraction and recovery on the SBS modified asphalt mixture of the same service life and the same layer according to the blank test process.
(4) Carrying out a plurality of performance analysis tests on the SBS modified asphalt which is extracted and recovered, wherein the performance analysis tests comprise a temperature scanning test, a bending beam rheometer test, infrared spectrum analysis and fluorescence microscope analysis;
the results of temperature scanning of 3 SBS modified asphalt at different levels were shown in fig. 4 and 5, and it can be seen from fig. 4 that there is a significant difference in complex shear modulus of asphalt, wherein SBSMA-5 a-upper > lower. Therefore, after the asphalt pavement is naturally aged for 5 years, the anti-deformation capacity on the SBSMA-5 a-is the best, and then in the SBSMA-5a-, the SBSMA-5 a-is below. The phase angle change trend of the sample is SBSMA-5 a-up > under the condition that the viscoelastic component of the sample is gradually changed at different depths after natural aging for 5 years. The rutting factor is commonly used for characterizing the high-temperature performance of asphalt, and the rutting resistance of the reaction asphalt material at high temperature is shown in fig. 5, and the change trend of the rutting factor of the sample is SBSMA-5 a-upper > and lower.
3 parts of SBS modified asphalt at different layers is tested by a bending beam rheometer test, the stiffness modulus of the upper layer of the SBS modified asphalt at-12 ℃ is 162, and the creep rate is 0.337; middle layer stiffness modulus 141, creep rate 0.373; the lower layer stiffness modulus was 128 and the creep rate was 0.395.
Performing infrared spectroscopic analysis and calculation on 3 parts of SBS modified asphalt at different layers to obtain that the carbonyl index of the upper layer of the SBS modified asphalt is 0.044 and the butadiene index is 0.014; the middle layer carbonyl index is 0.033 and the butadiene index is 0.029; the lower carbonyl index was 0.024 and the butadiene index was 0.042.
3 parts of SBS modified asphalt at different layers is subjected to a fluorescence microscope to obtain the distribution state of the SBS modifier in the asphalt at different layers as shown in figure 6. After 5 years of natural aging, the SBS modifier is distributed uniformly at different depths, but from the distribution density, the SBSMA-5 a-is the smallest in distribution density, the SBSMA-5 a-is the second in distribution density, and the SBSMA-5 a-is the last in distribution density. The distribution density obtained by Image-Pro Plus treatment was: SBSMA-5 a-has an upper layer of 0.030, a middle layer of 0.045 and a lower layer of 0.053.
(5) And evaluating the aging gradient behavior of the SBS modified asphalt according to a plurality of performance analysis test results.
According to the results of the performance analysis and test, the macroscopic properties and the microscopic properties of the upper layer, the middle layer and the lower layer of the SBS modified asphalt are obviously different. Comparing macroscopic properties, it can be seen that the upper layer is most aged, followed by the middle layer, and finally the lower layer. Compared with microscopic properties, the microscopic properties show that the oxidation rate of the SBS modified asphalt and the degradation condition of the SBS modifier are better matched with the macroscopic properties, the change condition and the oxidation degree of the SBS modifier on different layers of the SBS modified asphalt can be better reflected, and the aging gradient behavior of the SBS modified asphalt can be better evaluated by the method.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The method for evaluating the aging gradient behavior of SBS modified asphalt is characterized by comprising the following steps of:
obtaining SBS modified asphalt mixture core samples with different service lives, and carrying out layering treatment on the SBS modified asphalt mixture core samples to obtain SBS modified asphalt mixtures with different service lives and different layers;
setting a blank test of asphalt extraction and recovery, performing penetration test, softening point test, ductility test and Brookfield rotational viscosity test on the asphalt extracted and recovered in the blank test and the original asphalt, and comparing the test results of the extracted and recovered asphalt and the original asphalt;
if the comparison result exceeds the set threshold value, repeating the blank test until the comparison result is less than or equal to the set threshold value; if the comparison result is less than or equal to the set threshold value, respectively carrying out asphalt extraction and recovery on the SBS modified asphalt mixture of the same service life and the same layer according to the blank test process;
carrying out a plurality of performance analysis tests on the SBS modified asphalt which is extracted and recovered, wherein the performance analysis tests comprise a temperature scanning test, a bending beam rheometer test, infrared spectrum analysis and fluorescence microscope analysis;
and evaluating the aging gradient behavior of the SBS modified asphalt according to the performance analysis test results.
2. The evaluation method according to claim 1, wherein 10 to 15 SBS modified asphalt mixture core samples are taken per service life.
3. The evaluation method according to claim 1 or 2, wherein the SBS modified asphalt core sample is subjected to a layering process comprising:
and cutting the SBS modified asphalt mixture core sample into an upper layer, a middle layer and a lower layer by using a cutting machine, wherein the thickness of each layer is 8-12 mm.
4. The evaluation method according to claim 1, wherein the blank test comprises the steps of:
selecting original asphalt and mineral powder, and preparing asphalt mucilage with a mucilage ratio of 0.8; the original asphalt is SBS modified asphalt;
dissolving asphalt mucilage in trichloroethylene, and standing until asphalt in the asphalt mucilage is completely dissolved in the trichloroethylene;
putting the obtained solution into a centrifugal machine for centrifugation to remove mineral powder in the solution and obtain an asphalt solution;
and (4) carrying out rotary evaporation on the asphalt solution to obtain the extracted and recovered asphalt.
5. The method of claim 4, wherein prior to subjecting the bituminous solution to rotary evaporation, a deliming treatment is performed on the bituminous solution, comprising:
placing the asphalt solution in a beaker, and standing for 24 hours;
and taking the upper layer 2/3 solution of the settled asphalt solution, placing the solution in another new beaker, continuing to settle for 24 hours, and taking the upper layer 2/3 solution to obtain a pure asphalt solution.
6. The evaluation method of claim 1, wherein the asphalt extraction and recovery of the SBS modified asphalt mixture of the same service life and the same layer are respectively carried out according to the blank test process, and the method comprises the following steps:
weighing 1000-1500 g of SBS modified asphalt mixture with the same service life and the same layer, putting the mixture into an oven, and heating the mixture to be in a loose state, wherein the temperature of the oven is less than 100 ℃, and the heating time is not more than 30 min;
dissolving the loosened SBS modified asphalt mixture in trichloroethylene, and soaking for 30-35 min;
centrifuging the obtained solution in a centrifuge to remove mineral powder in the solution, and taking upper-layer liquid;
adding trichloroethylene into the centrifuged sediments continuously, soaking for 15-20 min, centrifuging, and taking the upper-layer liquid;
continuously adding the trichloroethylene into the centrifuged sediment, soaking, centrifuging and taking the upper liquid until the obtained upper liquid is light yellow;
mixing all the upper layer liquids to obtain an extracted and recovered SBS modified asphalt solution; and carrying out rotary evaporation on the SBS modified asphalt solution to obtain the extracted and recovered SBS modified asphalt.
7. The method of claim 6, wherein the step of subjecting the SBS modified asphalt solution to rotary evaporation to obtain extracted and recovered SBS modified asphalt comprises:
putting 350-400 ml of SBS modified asphalt solution into 1000ml of rotary flask;
starting a vacuum pump to enable a rotary evaporation system to form negative pressure, wherein the vacuum degree is 94.7KPa, starting a rotary flask at the speed of 35-45 r/min, and immersing the rotary flask into an oil bath at the temperature of 45-50 ℃;
when no solvent is condensed, the distillation is finished, the rotating speed of the rotary flask is reduced to 15-20 r/min, the oil bath temperature is increased to 155 ℃ and kept for 15min, and then CO is opened2And (4) turning off a gas valve when no residual trichloroethylene exists in the flask, and collecting the SBS modified asphalt.
8. The method of claim 6, wherein prior to the rotary evaporation of the SBS modified asphalt solution, the SBS modified asphalt solution is subjected to a de-mineralizing treatment comprising:
placing the SBS modified asphalt solution in a beaker, and standing for 24 hours;
and (3) placing the standing SBS modified asphalt solution into another new beaker after taking the upper layer 2/3 solution, continuing standing for 24h, and taking the upper layer 2/3 solution to obtain the pure SBS modified asphalt solution.
9. The method of claim 1, wherein the extracted and recovered SBS modified asphalt is subjected to a plurality of performance analysis tests comprising:
carrying out a temperature scanning test on the extracted and recovered SBS modified asphalt to obtain a plurality of shear moduli, phase angles and rutting factors of the SBS modified asphalt for evaluating the high-temperature performance of the SBS modified asphalt;
performing a bending beam rheometer test on the SBS modified asphalt recovered by extraction to obtain stiffness modulus and creep rate for evaluating the low-temperature performance of the SBS modified asphalt;
carrying out infrared spectrum analysis on the SBS modified asphalt which is extracted and recovered, and calculating to obtain the carbonyl index and the butadiene index of the SBS modified asphalt;
and (3) carrying out fluorescence microscope analysis on the extracted and recovered SBS modified asphalt so as to observe the distribution state of the SBS modifier in the SBS modified asphalt.
10. The evaluation method according to claim 9, wherein the SBS modified asphalt is subjected to infrared spectroscopic analysis, and the carbonyl index and butadiene index of the SBS modified asphalt are obtained by calculation using the formula (1) and the formula (2),
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