Method for performing infrared spectroscopic analysis on SBS modifier content of modified asphalt

Abstract

The invention discloses a method for performing infrared spectroscopic analysis on the SBS modifier content of modified asphalt, which comprises the following steps of: acquiring transmittance spectrum of an SBS modified asphalt sample with the known SBS modifier content by using a Fourier infrared spectrometer; computing a relative ratio A of a peak area which only belongs to a characteristic infrared absorption peak of the SBS to a peak area which only belongs to the characteristic infrared absorption peak of matrix asphalt on the transmittance spectrum; performing a parallel test for multiple times to determine the corresponding standard A value of the SBS modified asphalt sample; performing an infrared spectroscopic transmittance spectrum test on the SBS modified asphalt sample to be tested to obtain the transmittance spectrum of the sample; computing the relative ratio of the areas of the corresponding absorption peaks of the sample; and comparing the relative ratio with the standard A value to determine the SBS content of the sample. The general infrared transmittance spectrum test technique is adopted, so the method has the advantages of simple sampling process, convenient and quick establishment of a measuring method, correct and credible quantitative result, high sensitivity, high repeatability and suitability for wide application.

Description

technical field [0001] The invention relates to a method for analyzing the content of SBS modifier in SBS modified asphalt, in particular to an infrared spectrum analysis method for the content of SBS modifier in modified asphalt. Background technique [0002] Thermoplastic rubber SBS is a block copolymer of styrene-butadiene-styrene, which is the most economical and effective asphalt modifier. SBS modified asphalt has good elastic recovery and high temperature characteristics, and can prevent low temperature cracking. It is a kind of modified asphalt widely used at home and abroad; SBS modified asphalt has excellent high and low temperature performance and unparalleled elasticity at high temperature. The application on graded roads and other roads can significantly improve the performance of the road surface, greatly improve the smoothness and friction coefficient of the road surface, prolong the service life of the road surface and reduce maintenance costs. [0003] Studi...

AI Technical Summary

Problems solved by technology

The ATR accessory is constructed based on the principle of attenuated total reflection. The penetration depth of infrared light in the sample is shallow, only a few microns, so the signal intensity of the sample obtained is low, and it lacks sufficient sensitivity when determining the content of a small amount of modifier. large detection error

At the same time, in this method, the uniformity and thickness of the asphalt sample in the accessory crystal tank have a great influence on the final quantitative analysis results, and there are relatively strict requirements on the operating skills of actual operators, which affects the reproducibility of test results

Moreover, ATR accessories are more expensive

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