CN110186866B - Method for determining degradation amount of SBS modified asphalt - Google Patents
Method for determining degradation amount of SBS modified asphalt Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 166
- 238000000034 method Methods 0.000 title claims abstract description 61
- 230000015556 catabolic process Effects 0.000 title claims abstract description 55
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 55
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims abstract description 100
- 230000032683 aging Effects 0.000 claims abstract description 80
- 239000003607 modifier Substances 0.000 claims abstract description 74
- 238000002474 experimental method Methods 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims description 18
- 239000000523 sample Substances 0.000 claims description 18
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 claims description 15
- 238000004566 IR spectroscopy Methods 0.000 claims description 15
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 14
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- 238000001514 detection method Methods 0.000 abstract description 5
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- 238000011069 regeneration method Methods 0.000 description 5
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- 238000000799 fluorescence microscopy Methods 0.000 description 1
- 238000005227 gel permeation chromatography Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
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- G01—MEASURING; TESTING
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- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- 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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Abstract
The invention provides a method for determining the degradation amount of SBS modified asphalt, which comprises the following steps: taking m SBS modified asphalt mixed with known SBS modifier, and carrying out m aging experiments with different time lengths to obtain m SBS modified asphalt used as a sample to be tested with different aging time lengths; preparing infrared spectrograms of m samples to be detected; obtaining butadiene indexes of m samples to be detected; making a relation curve of the butadiene index and the aging duration; obtaining the butadiene index of the SBS modified asphalt with the required aging time according to the relation curve; and calculating the degradation amount of the SBS modifier for the required aging time period based on the doping amount of the SBS modifier in the SBS modified asphalt, the butadiene index of the unaged SBS modified asphalt and the butadiene index of the SBS modified asphalt for the required aging time period. The method can effectively determine the degradation amount of the SBS modifier in the aging process of the SBS modified asphalt, and the detection result is accurate and reliable.
Description
Technical Field
The invention relates to a method for determining the degradation amount of modified asphalt, belonging to the field of asphalt material detection.
Background
The modified asphalt is an asphalt binder prepared by adding external additives (modifiers) such as rubber, resin, high molecular polymer, ground rubber powder or other fillers or by adopting measures such as mild oxidation processing of the asphalt and the like, so that the performance of the asphalt or the asphalt mixture is improved.
The SBS modifier is a triblock copolymer composed of styrene (hard segment S) and butadiene (constituting soft segment B), and has the characteristics of good elasticity (self-recovery of deformation and self-recovery of cracks), no softening at high temperature, no brittleness at low temperature and the like. The SBS modified asphalt is added into asphalt according to a certain proportion, and is uniformly dispersed in modes of shearing, stirring and the like, so that the formed SBS modified asphalt has good road performance and is widely applied to high-grade asphalt pavements in China. As the asphalt pavement in China enters a large-scale maintenance period, the SBS modified asphalt pavement also faces the same problem, wherein the asphalt pavement regeneration is an effective technical means.
The pavement regeneration is carried out by firstly judging the aging degree of the SBS modified asphalt. The SBS modified asphalt is not only aged in the using process, but also degraded along with the invalidation of the SBS modifier, so that the original performance of the SBS modified asphalt cannot be completely recovered even if the regenerant is added. Research shows that the degradation of SBS is irreversible, so that the degradation amount of SBS modifier is obtained quantitatively, and the loss of modifier is supplemented.
At present, the technical means for measuring the content of the modifier in the SBS modified asphalt mainly comprise: dissolution separation, permeation gel chromatography, fluorescence microscopy, and infrared spectroscopy. Infrared spectroscopy is widely used because of its relatively high accuracy due to its long test time. The content of the SBS modifier in the SBS modified asphalt can be only determined by means of infrared spectroscopy, and the degradation amount of the SBS modifier cannot be determined. Aiming at the regeneration of the SBS modified asphalt, only a regenerant is added, and the degraded modifier is not supplemented, so that a method capable of measuring the degradation amount of the SBS modifier is needed, the supplement is performed for 'secondary modification', and the pavement performance of the regenerated SBS modified asphalt mixture is improved.
Disclosure of Invention
Problems to be solved by the invention
In view of the technical problems in the prior art, the invention provides a method for determining the degradation amount of SBS modified asphalt. The method can determine the degradation amount of the SBS modifier in the aging process of the SBS modified asphalt.
Means for solving the problems
The invention provides a method for determining the degradation amount of SBS modified asphalt, which comprises the following steps:
taking m SBS modified asphalt mixed with known SBS modifier, and carrying out m aging experiments with different time lengths to obtain m SBS modified asphalt used as a sample to be tested with different aging time lengths;
preparing infrared spectrograms of m samples to be detected;
obtaining butadiene indexes of m samples to be detected, wherein the butadiene indexes are 966cm of the infrared spectrogram-1Characteristic peak of position and 1376cm-1The ratio of peak areas of characteristic peaks of the positions;
making a relation curve of the butadiene index and the aging duration;
obtaining the butadiene index of the SBS modified asphalt with the required aging time according to the relation curve;
and calculating the degradation amount of the SBS modifier with the required aging time length based on the doping amount of the SBS modifier in the SBS modified asphalt, the butadiene index of the unaged SBS modified asphalt and the butadiene index of the SBS modified asphalt with the required aging time length.
The method for determining the degradation amount of the SBS modified asphalt comprises the step of heating, wherein the heating temperature is 160-180 ℃.
According to the method for determining the degradation amount of the SBS modified asphalt, the aging experiment is a film heating experiment.
According to the method for determining the degradation amount of the SBS modified asphalt, infrared spectroscopy experiments are carried out by adopting a film method to obtain the infrared spectrogram.
According to the method for determining the degradation amount of the SBS modified asphalt, carbon tetrachloride or carbon disulfide is used as a solvent in the infrared spectrum experiment.
According to the method for determining the degradation amount of the SBS modified asphalt, the infrared spectrum experiment comprises the steps of respectively dissolving the samples to be detected in the solvent to obtain a sample solution to be detected; preferably, in the solution of the sample to be detected, the concentration of the sample to be detected is 0.01-0.1 g/ml.
According to the method for determining the degradation amount of the SBS modified asphalt, the butadiene index of the sample to be tested is calculated by an integral intensity method.
The method for determining the degradation amount of the SBS modified asphalt comprises the following steps of (1) calculating the degradation amount of the SBS modifier with the required aging time according to a formula (I);
wherein: dnThe amount of degradation of the SBS modifier for the desired length of aging;
A0the blending amount of the SBS modifier is SBS modified asphalt;
CI0butadiene index for the unaged SBS modified asphalt;
CInthe butadiene index of the SBS modified asphalt is the desired length of aging.
ADVANTAGEOUS EFFECTS OF INVENTION
The method can effectively determine the degradation amount of the SBS modifier in the aging process of the SBS modified asphalt, and the detection result is accurate and reliable.
Furthermore, based on the degradation amount of the SBS modifier, the SBS modifier with the loss amount being approximately the same as that of the regenerant can be added, and the SBS modifier can generate a synergistic effect with the regenerant, so that the performance of the asphalt is better recovered, the road performance of the regenerated SBS modified asphalt road surface is improved, and the service life of the road surface is prolonged.
Drawings
FIG. 1 shows an infrared spectrum of a base asphalt and an SBS modified asphalt without aging;
FIG. 2 shows an infrared spectrum of SBS modified asphalt of example 1 of the present invention after 5 hours of aging.
FIG. 3 shows an infrared spectrum of SBS modified asphalt of example 1 of the present invention after 10 hours of aging.
FIG. 4 shows the butadiene index versus aging time for example 1 according to the invention.
Detailed Description
Various exemplary embodiments, features and aspects of the invention will be described in detail below. The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In other instances, methods, means, devices and steps which are well known to those skilled in the art have not been described in detail so as not to obscure the invention.
All units used in the present invention are international standard units unless otherwise stated, and numerical values and numerical ranges appearing in the present invention should be understood to include systematic errors inevitable in industrial production.
The SBS modified asphalt can be a multi-phase composite material formed by mixing an SBS modifier and matrix asphalt, and the performance of the SBS modified asphalt is greatly improved compared with that of the matrix asphalt. The SBS modified asphalt pavement has high construction cost and high regeneration value, and is very important for improving the service performance of the regenerated SBS modified asphalt pavement. During the use process of the SBS modified asphalt, the aging of the base asphalt is accompanied with the degradation of the SBS modifier, so that the degradation amount of the SBS modifier during the use process needs to be measured.
In view of the above, the present invention provides a method for determining the degradation amount of SBS modified asphalt, which selects one SBS modified asphalt (the content of the SBS modifier is known) to perform aging treatment for different durations respectively. And (3) carrying out infrared spectrum test on the aged SBS modified asphalt, calculating the butadiene index of the aged SBS modified asphalt by an integral intensity method, analyzing and establishing a relation curve between the aging time of the SBS modified asphalt and the butadiene index, and further calculating the degradation amount of the SBS modifier under different aging time.
Specifically, the method comprises the following steps:
taking m SBS modified asphalt mixed with known SBS modifier, and carrying out m aging experiments with different time lengths to obtain m SBS modified asphalt used as a sample to be tested with different aging time lengths;
preparing infrared spectrograms of m samples to be detected;
obtaining butadiene indexes of m samples to be detected, wherein the butadiene indexes are 966cm of the infrared spectrogram-1Characteristic peak of position and 1376cm-1The ratio of peak areas of characteristic peaks of the positions;
making a relation curve of the butadiene index and the aging duration;
obtaining the butadiene index of the SBS modified asphalt with the required aging time according to the relation curve;
and calculating the degradation amount of the SBS modifier with the required aging time length based on the doping amount of the SBS modifier in the SBS modified asphalt, the butadiene index of the unaged SBS modified asphalt and the butadiene index of the SBS modified asphalt with the required aging time length.
The method can effectively determine the degradation amount of the SBS modifier in the aging process of the SBS modified asphalt, and the detection result is accurate and reliable. Based on the degradation amount of the SBS modifier, the SBS modifier with the loss amount being approximately the same as that of the regenerant can be added, the SBS modifier can generate a synergistic effect with the regenerant, the performance of the asphalt is better recovered, the pavement performance of the regenerated SBS modified asphalt pavement is improved, and the service life of the pavement is prolonged. Specifically, the method comprises the following steps:
SBS modified asphalt
The SBS modified asphalt can be prepared by mixing an SBS modifier with matrix asphalt and can also be obtained by purchasing. Preferably, the matrix asphalt sample may be road petroleum asphalt. The road petroleum asphalt comprises one or more of low-grade road petroleum asphalt (such as 25# road petroleum asphalt, 35# road petroleum asphalt, 50# road petroleum asphalt and the like), 70# to 200# road petroleum asphalt and the like. The invention preferably uses the No. 70 road petroleum asphalt as the base asphalt for preparing the SBS modified asphalt.
Specifically, the preparation method of the SBS modified asphalt of the invention may include the following steps:
step 1), taking a matrix asphalt sample, heating, and then adding an SBS modifier to obtain a premix;
and 2) shearing the pre-mixture to obtain the SBS modified asphalt.
Preferably, in the step 1), the temperature for heating may be 150 to 180 ℃, for example, 160 ℃, 165 ℃, 170 ℃, 175 ℃ or the like, in order to make the SBS modifier more soluble in the base asphalt sample. In step 1), the pre-mixture may be swollen while stirring, and the swelling time may be, for example, 10 to 50min, preferably 20 to 40 min.
Further, the shearing treatment comprises shearing treatment at the rotating speed of 15000r/min-25000r/min, the time of high-speed shearing treatment is 1-5h, and the temperature of high-speed shearing treatment is 150-180 ℃.
Further, in the shearing treatment process, the material can be placed in an environment of 110-125 ℃ for melting and swelling for 10-20 h.
Aging test
In the present invention, the aging test was conducted to simulate the aging of asphalt pavement during use. In the invention, the aging test comprises a heating step, wherein the heating temperature is 160-180 ℃, for example: 161 deg.C, 163 deg.C, 165 deg.C, 170 deg.C, 175 deg.C, etc.
Preferably, in the present invention, the aging test is a thin film heating test.
The film heating experiment is suitable for measuring the quality change of road petroleum asphalt and polymer modified asphalt after being heated by a film oven (TFOT for short). The invention aims to obtain aged SBS modified asphalt by utilizing a film heating experiment. The film heating experiment was preferably carried out using a film heating oven in accordance with the method of T0609 in JTG E20-2011.
Preferably, specifically, according to the method of T0609 in JTG E20-2011, the film-feeding oven should start the aging time when the temperature is raised back to the test temperature, so that the SBS modified asphalt is heated under the temperature condition.
The invention can take m SBS modified asphalts with the mixing amount of the known SBS modifier to carry out m film heating experiments with different time lengths, and m SBS modified asphalts which are taken as samples to be tested and have different aging time lengths are obtained.
Infrared spectroscopy experiment
Infrared spectrum is the infrared absorption spectrum of a substance, which is also called molecular vibration spectrum or vibration-transition spectrum, and is obtained by detecting the absorption condition of infrared rays, wherein infrared rays with certain wavelengths can be selectively absorbed by molecules to cause the transition of vibration energy level and rotation energy level in the molecules. According to the invention, an infrared spectrogram of the sample to be detected can be obtained through an infrared spectrum experiment.
Infrared spectroscopy is one of the most common methods in the chemical structure of petroleum asphalt and is also an important means for identifying heteroatom compounds in petroleum asphalt. The characteristics of the functional groups in the asphalt can be qualitatively analyzed through infrared spectroscopy experiments, and the change conditions of the relative contents of the characteristic functional groups before and after the asphalt is aged can be quantitatively compared according to an integral intensity method. Compared with the base asphalt, the SBS modified asphalt has the advantage that the wave number representing the polystyrene is 699cm due to the presence of the SBS modifier-1The absorption peak at (A) and the wave number representing polybutadiene (i.e., the wave number of C ═ C bond in polybutadiene) were 966cm-1The absorption peak at (c). Before and after the aging of the SBS modified asphalt, the SBS modifier is degraded, and the content of the characteristic functional group is reduced.
The inventor of the invention finds that the degradation amount of the SBS modifier along with the asphalt aging process can be determined based on the change of the infrared spectrum of the SBS modified asphalt before and after aging. Therefore, the recycling performance of the SBS modified asphalt pavement is further improved by adopting a corresponding technical means to supplement the degraded SBS modifier.
In general, for liquid substances, infrared spectroscopy can be performed by a thin film method or a solution method. Wherein the solvent used is carbon tetrachloride or carbon disulfide. In the invention, for the liquid which is difficult to volatilize, a thin film method can be adopted for experiment; for the liquid pool, a solution method can be adopted for experiments; wherein the solvent used is carbon tetrachloride or carbon disulfide. For the solid, experiments can be carried out by a salt paste method, a KBR tabletting method, a film method, and the like.
In the present invention, it is preferable to perform an infrared spectroscopy experiment using a thin film method to obtain the infrared spectrum. Specifically, the sample to be detected is dissolved in a volatile solvent with a low boiling point, the solution is coated on a glass slide, and after the solvent is volatilized, a film is formed and infrared spectrum measurement is carried out to obtain an infrared spectrogram of the sample to be detected.
In the infrared spectroscopy experiment, carbon tetrachloride or carbon disulfide is used as a solvent. Preferably, the infrared spectrum experiment comprises the steps of respectively dissolving the samples to be detected in solvents to obtain sample solutions to be detected; in the solution of the sample to be detected, the concentration of the sample to be detected is 0.01-0.1 g/ml.
The inventor of the invention finds that the degradation amount of SBS modified asphalt can be determined based on the change of the characteristic functional group of SBS modifier in the infrared spectrum. The scheme of the invention can be applied to the regeneration technology of the SBS modified asphalt pavement, and the pavement performance of the regenerated asphalt pavement is improved.
Integral intensity method
Based on the infrared spectrogram of the sample to be detected, the butadiene index (also called B chain index BI) of the sample to be detected can be obtained according to an integral intensity method, wherein the butadiene index is 966cm of the infrared spectrogram-1Characteristic peak of position and 1376cm-1The ratio of peak areas of characteristic peaks of the positions. Wherein, the infrared spectrogram is 966cm-1The characteristic peak of the position is the characteristic peak of C ═ C in polybutadiene of SBS modifier, 1376cm-1Characteristic peak at position is CH3Characteristic peak of (2).
By performing infrared spectrum experiments on m samples to be detected, infrared spectrograms of the m samples to be detected can be obtained, and then butadiene indexes of the m samples to be detected can be obtained. Based on the butadiene indexes and the aging time of m samples to be tested, taking the aging time as an abscissa and the butadiene index as an ordinate, and making a relation curve of the butadiene indexes and the aging time; according to the relation curve, the butadiene index of the SBS modified asphalt with the required aging time can be obtained.
Calculation of the amount of degradation of SBS modifier
The method can calculate the degradation amount of the SBS modifier with the required aging time based on the doping amount of the SBS modifier in the SBS modified asphalt, the butadiene index of the unaged SBS modified asphalt and the butadiene index of the SBS modified asphalt with the required aging time.
Concretely, the mixing amount of the SBS modifier in the SBS modified asphalt is set as A0Butadiene index of the unaged SBS modified asphalt is CI0The butadiene index of the SBS modified asphalt with the required aging time is CInAccording to
In relation to (A), the amount of the SBS modifier doped with the SBS modifier can be obtained for the required aging timen(%), degradation D of the SBS modifier with the required aging timen＝A0-AnSubstituted into AnThat is, the degradation D of the SBS modifier can be obtained for a desired aging periodn(％)。
Further, the degradation amount of the SBS modifier with the required aging time is calculated according to the formula (I);
wherein: dnThe amount of degradation of the SBS modifier for the desired length of aging, (%);
A0the blending amount of the SBS modifier of the SBS modified asphalt is (%);
CI0butadiene index for the unaged SBS modified asphalt;
CInthe butadiene index of the SBS modified asphalt is the desired length of aging.
In addition, SBS modified asphalt with different aging time lengths can be used for carrying out the same experimental analysis, and the reliability of the test result of the invention is verified by using the test method of the invention.
The method can effectively determine the degradation amount of the SBS modifier in the aging process of the SBS modified asphalt, and the detection result is accurate and reliable. Based on the degradation amount of the SBS modifier, the SBS modifier with the loss amount being approximately the same as that of the regenerant can be added, the SBS modifier can generate a synergistic effect with the regenerant, the performance of the asphalt is better recovered, the pavement performance of the regenerated SBS modified asphalt pavement is improved, and the service life of the pavement is prolonged.
Examples
Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Example 1
Preparing SBS modified asphalt:
the SBS modified asphalt is prepared by a high-speed shearing process, and the preparation process of the modified asphalt comprises the following steps:
(1) heating the base asphalt to 160 ℃, adding 4.5 percent of SBS modifier based on the total weight of the base asphalt, manually stirring and melting and expanding for 30 min;
(2) starting a shearing machine, stirring at high speed (19000r/min) for 2h, and keeping the shearing temperature at 160 ℃;
(3) the modified asphalt is melted and expanded for 15 hours at the temperature of 125 ℃;
(4) and continuously shearing the modified asphalt for 30min to obtain the finished product of modified asphalt.
In this example, the butadiene index CI of the unaged SBS modified asphalt00.3554, the mixing amount of SBS modifier A04.5%, wherein the infrared spectra of the unaged SBS modified asphalt and the base asphalt are shown in FIG. 1.
(1) According to the method of T0609 in JTG E20-2011, SBS modified asphalt with the SBS modifier content of 4.5% is taken to carry out film heating aging experiments for 0h, 5h, 8h, 12h and 15h at the temperature of 163 +/-1 ℃, and the aging of the asphalt pavement in the using process is simulated.
(2) And (3) carrying out an infrared spectrum experiment on the aged SBS modified asphalt for 5 hours. The experiment was conducted using a thin film method using carbon tetrachloride as the solvent. And dissolving the SBS modified asphalt aged for 5 hours in carbon tetrachloride, and preparing all samples to be tested subjected to the infrared spectrum experiment into 0.05g/ml solution to be tested for calculation and analysis, namely the concentration of the SBS modified asphalt aged for 5 hours is 0.05 g/ml. Specifically, a drop of solution to be tested is taken by using a rubber head dropper on a glass slide, and the glass slide is put into an infrared spectrometer for testing after being dried by a blower. The infrared spectrogram of the SBS modified asphalt aged for 5h shown in figure 2 is obtained.
(3) Calculating by an integral intensity method to obtain the butadiene index of the SBS modified asphalt after aging for 5h, wherein the butadiene index is 966cm of the infrared spectrogram-1Characteristic peak of position and 1376cm-1The ratio of peak areas of characteristic peaks of the positions. Wherein, the infrared spectrogram is 966cm-1The characteristic peak of the position is that of polybutadiene of SBS modifier, 1376cm-1Characteristic peak at position is CH3Characteristic peak of (2).
(4) And (3) performing infrared spectroscopy experiments on the unaged (aged for 0h), aged for 8h, aged for 12h and aged for 15h to obtain the butadiene indexes of the unaged SBS modified asphalt and aged for 8h, aged for 12h and aged for 15h respectively.
(5) And summarizing experimental results by taking the aging duration as an abscissa and taking the butadiene index as an ordinate, and fitting a curve to obtain a fitted curve, namely a relationship curve of the butadiene index and the aging duration.
According to FIG. 4, fitting the data yields the regression equation, the correlation coefficient R2The fitting accuracy was good at 0.9875.
y＝0.3534e-0.046x (1)
Wherein: y is the butadiene index;
x is the aging duration.
Substituting the formula (1) into the formula (I) to obtain the degradation D of the SBS modifiernNamely:
wherein: dnThe amount of degradation of the SBS modifier for the desired length of aging, (%);
A0the blending amount of the SBS modifier of the SBS modified asphalt is (%);
CI0butadiene index for the unaged SBS modified asphalt;
CInthe butadiene index of the SBS modified asphalt is the required aging time;
x is the aging duration (h).
According to the formula (2), the degradation amounts of the SBS modifier after aging for 5h, 8h, 12h and 15h can be calculated and respectively are as follows: 0.94%, 1.40%, 1.92%, 2.26%.
(6) The butadiene index calculation of the SBS modified asphalt aged for 10h (x is 10h, namely the required aging time is 10h) shows that 0.2231, and the degradation amount of the SBS modifier after being aged for 10h is 1.68% according to the formula (2).
As shown in FIG. 3, the actual value of the butadiene index obtained by IR spectroscopy of 10h aged SBS modified asphalt was 0.2114, within acceptable error. Therefore, the method of the invention can accurately and reliably determine the degradation amount of the SBS modified asphalt.
The above examples of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A method for determining the degradation amount of SBS modified asphalt is characterized by comprising the following steps:
taking m SBS modified asphalt mixed with known SBS modifier, and carrying out m aging experiments with different time lengths to obtain m SBS modified asphalt used as a sample to be tested with different aging time lengths;
preparing infrared spectrograms of m samples to be detected;
obtaining butadiene indexes of m samples to be detected, wherein the butadiene indexes are 966cm of the infrared spectrogram-1Characteristic peak of position and 1376cm-1The ratio of peak areas of characteristic peaks of the positions;
making a relation curve of the butadiene index and the aging duration;
obtaining the butadiene index of the SBS modified asphalt with the required aging time according to the relation curve;
calculating the degradation amount of the SBS modifier with the required aging time according to the formula (I);
wherein: dnThe amount of degradation of the SBS modifier for the desired length of aging;
A0the blending amount of the SBS modifier is SBS modified asphalt;
CI0butadiene index for the unaged SBS modified asphalt;
CInthe butadiene index of the SBS modified asphalt is the desired length of aging.
2. The method for determining the degradation amount of SBS modified asphalt according to claim 1, wherein the aging test comprises a heating step, and the heating temperature is 160-180 ℃.
3. The method according to claim 2, wherein the aging test is a thin film heating test.
4. The method for determining the degradation amount of SBS modified asphalt according to any one of claims 1-3, wherein IR spectroscopy is performed using thin film method to obtain the IR spectrogram.
5. The method for determining the degradation amount of SBS modified asphalt according to claim 4, wherein carbon tetrachloride or carbon disulfide is used as solvent in the IR spectroscopy experiment.
6. The method according to claim 5, wherein the IR spectroscopy experiment comprises dissolving the samples in the solvent to obtain a sample solution.
7. The method for determining the degradation amount of SBS modified asphalt according to claim 6, wherein the concentration of the sample to be tested in the sample solution to be tested is 0.01-0.1 g/ml.
8. The method for determining the degradation amount of SBS modified asphalt according to any one of claims 1-3, wherein the butadiene index of the sample to be tested is calculated by an integral intensity method.
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