Method used for detecting SBS content in SBS modified asphalt by gel permeation chromatography

Abstract

The invention relates to a method used for detecting SBS content in SBS modified asphalt by gel permeation chromatography. The method comprises following steps: (1) a plurality of portions of SBS modified asphalt with different modifier doping contents are prepared; (2) each portion of the SBS modified asphalt is added into 5ml of tetrahydrofuran for dissolving so as to prepare a plurality of portions of tetrahydrofuran-modified asphalt solution with different modifier doping contents, wherein each portion is 5ml; (3) modified peak areas and asphalt peak areas are recorded by a ViscotekTDAmax gel permeation chromatograph, and specific values of the modified peak areas to the asphalt peak areas are calculated; (4) an exponential regression equation is built, wherein the specific values of peak areas are represents by x-coordinate, the modifier doping contents are represented by y-coordinate; and (5) a SBS modifier doping content of asphalt that is to be modified is determined, wherein the asphalt that is to be modified is detected by gel permeation chromatography, a specific value of modifier peak area to asphalt peak area is calculated, and the specific value is introduced into the exponential regression equation so as to obtain the SBS modifier doping content of the modified asphalt that is to be detected. The method is rapid; results are accurate and reliable; and operability is excellent.

Description

technical field [0001] The invention relates to the field of detection of the content of SBS modified asphalt, in particular to a method for testing SBS content in SBS modified asphalt by gel permeation chromatography. Background technique [0002] At present, the SBS (styrene-butadiene-styrene) modifier dosage testing methods mainly include viscosity-dosage testing methods, unsaturation testing methods, and solvent separation and extraction methods. Among them, due to the dependence of the viscosity of modified asphalt on the processing technology and storage time, the test method based on viscosity-dosage has certain limitations; the solvent separation and extraction methods are complicated in operation and have large human factors, so the calculation cannot be guaranteed. Accuracy of the results; although the amount of the modifier is tested by the degree of unsaturation, although the sample demand is small and the operation is simple and convenient, but according to the ...

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Problems solved by technology

Among them, due to the dependence of the viscosity of modified asphalt on the processing technology and storage time, the test method based on viscosity-dosage has certain limitations; the solvent separation and extraction methods are complicated in operation and have large human factors, so the calculation cannot be guaranteed. Accuracy of the results; although the amount of the modifier is tested by the degree of unsaturation, although the sample demand is small and the operation is simple and convenient, but according to the test results, a wide range of the modifier content is obtained, and the modification cannot be accurately tested. dosage

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