[0035] In order to facilitate the understanding of the present invention, the embodiments of the present invention will be described below in conjunction with the accompanying drawings. Those skilled in the art should understand that the following description is only for the convenience of explaining the invention, and is not intended as a specific limitation on its scope.
[0036] In the present invention, a Raman spectrometer is used to detect the content of the SBS modifier. The Raman spectrometer is an instrument that can perform normal measurements on asphalt samples. In the present invention, a Horiba JY HR800 Raman spectrometer is preferably used. Since the Raman signal is much smaller than the background fluorescence, in order to realize the amplification of the Raman signal and eliminate the influence of the background fluorescence, in the present invention, the test sample is placed in the artificial metal micro-nano structure, which can realize the Raman Signal enhancement. In the artificial metal micro-nano structure, the measured Raman signal can be enhanced by 5 to 6 orders of magnitude, and the measured Raman signal can fully meet the measurement requirements.
[0037] First, establish a standard sample of SBS modified asphalt and a standard criterion for the content of SBS modifier. Obtain asphalt standard samples with different SBS modifier content. In order to ensure the accuracy of the measurement, select several asphalt standard samples, preferably more than 5 or more than 10 samples. Further, in the SBS with known SBS modifier content In the modified asphalt standard samples, the weight percentages of SBS modifier and base asphalt are selected as 1%, 2%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6.5%, 7%, 8% respectively. Samples are tested. An artificial metal micro/nano structure with Raman scattering enhancement function is selected as the test substrate, preferably the artificial metal micro/nano structure is a metal photonic crystal, a metal nano monomer, a metal nano dimer, or a metal nano particle array, etc.; Take a certain amount of SBS modified asphalt standard sample. Preferably, the SBS modified asphalt standard sample is 0.5 g or any other selected amount. The content of SBS modifier in the SBS modified asphalt standard sample is known. The SBS modified asphalt standard sample is dissolved in a predetermined volume of solvent, preferably the solvent is an organic solvent. Further, the organic solvent is a combination of chloroform, carbon tetrachloride, dichloromethane, trichloroethylene or acetone or any one of them Species; Then, the solution of the standard sample of SBS modified asphalt is uniformly coated on the surface of the above-mentioned substrate; Raman spectrometer is used at 300-2000cm -1 Measure the Raman spectra of SBS modified asphalt standard samples on the surface of the substrate within the range; measure the Raman spectra of multiple modified asphalt standard samples with different SBS modifier contents in parallel according to the above steps.
[0038] Such as figure 1 The Raman spectra of SBS modified asphalt standard samples with SBS modifier content of 3.5%, 4.5%, and 6.5% are shown in figure 1 In the Raman spectrum, the peak position of the Raman characteristic peak of the SBS modifier is 996 cm -1 , Which is attributed to the Raman scattering peak caused by the out-of-plane swing vibration of the two-stage hydrocarbon bond of olefin in SBS; the peak position of the Raman characteristic peak attributed only to the base pitch is 1601cm -1 , Which belongs to the Raman scattering peak caused by the vibration of the carbon-carbon double bond and the vibration of the benzene ring skeleton in the matrix asphalt; in the Raman spectrum of any SBS modified asphalt standard sample, the areas of the two peaks and the respective component concentrations Proportional; take the ratio between the above two peak areas, and do 5 parallel tests to take the mathematical average to obtain the standard ratio. Such as figure 1 The selected standard samples of SBS modified asphalt with contents of 3.5%, 4.5%, and 6.5% are calculated by calculating the ratio between the areas of the two characteristic peaks to obtain the SBS modifier contents of 3.5%, 4.5%, In the Raman spectrum of the 6.5% SBS modified asphalt standard sample, the standard ratios of the peak areas of the Raman characteristic peaks attributed only to the SBS to the Raman characteristic peaks attributed only to the base asphalt are 0.011, 0.014, and 0.020, respectively.
[0039] In addition, the SBS modified asphalt standard sample in the above embodiment is a standard sample with a known SBS modifier content. As a further embodiment, the standard sample can be prepared by accurately weighing the ratio of SBS to base asphalt, and by measuring several Configure the standard sample with a good proportion and repeat the above steps to detect and calculate the Raman spectrum.
[0040] Such as figure 2 As shown, according to the test results of SBS modified asphalt standard samples, the content of SBS modifier is taken as the abscissa, and 996cm -1 Peak area and 1601cm -1 The ratio between the peak areas is the ordinate, the standard curve is obtained by linear fitting, and the test results of at least two samples, preferably 3, or 5 or 10 or more samples are used to obtain the SBS modifier content and Correspondence diagram of the ratio between the characteristic peak areas of the Raman spectrum.
[0041] Secondly, the samples to be tested are tested.
[0042] Select the artificial metal micro-nano structure with Raman scattering enhancement function as the test substrate; completely dissolve a certain amount of the SBS modified asphalt sample to be tested in an organic solvent, preferably 0.1 g or 0.5 of the tested SBS modified asphalt sample Grams or any other selected amount, preferably a combination of chloroform, carbon tetrachloride, dichloromethane, trichloroethylene, or acetone, or any one of them, evenly spread the solution containing the SBS modified asphalt sample to be tested Cover the surface of the substrate; use the Raman spectrometer to test the Raman spectrum of the SBS modified asphalt sample to be tested on the surface of the substrate, image 3 Shown at 300-2000cm -1 Raman spectrum averaged after 5 tests in the range; 996cm in Raman spectrum calculated -1 And 1601cm -1 The relative ratio of the peak area is 0.017; and figure 2 The drawn standard curve is compared, and the content of SB5 modifier in the sample to be tested is 5.6%, thus realizing the quantitative detection of SBS modifier in SBS modified asphalt by Raman spectroscopy.
[0043] It can be understood that although the present invention has been disclosed as above in preferred embodiments, the above-mentioned embodiments are not intended to limit the present invention. For anyone skilled in the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent changes. Examples. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.
