Method for measuring thermal storage stability of SBS (Styrene-Butadiene-Styrene) polymer modified asphalt based on infrared spectrum technology

Abstract

The invention discloses a method for measuring the thermal storage stability of SBS (Styrene-Butadiene-Styrene) polymer modified asphalt based on an infrared spectrum technology. The method comprisesthe following steps: acquiring a standard infrared spectrogram of the SBS modified asphalt with known modifier dosage, determining a modifier characteristic peak 966cm<-1> area and a matrix asphalt characteristic peak 1377cm<-1> area, and taking a ratio of the two areas as the standard A value of the modified asphalt; carrying out a thermal storage test on the SBS polymer modifier asphalt for 48 hours with reference to JTG E20-2011 Standard Test Methods of Bitumen and Bituminous Mixtures for Highway Engineering T 0661-2011, taking one third of the top and one third of the bottom of a cooled sample for acquiring infrared spectrograms of the asphalt sample, and determining the A1 value and A2 value of the infrared spectrograms of the top and the bottom of the sample respectively; and then calculating the SBS modifier contents on the top and at the bottom of the sample, and judging the thermal storage stability of the SBS polymer modified asphalt according to the difference value betweenthe modifier contents.

Description

technical field [0001] The invention belongs to the technical field of asphalt detection, in particular to a method for measuring the thermal storage stability of SBS polymer modified asphalt based on infrared spectroscopy. Background technique [0002] With the rapid development of highway construction in our country, SBS polymer modified asphalt has been widely used in road construction due to its excellent high temperature resistance, low temperature resistance, anti-rutting, anti-fatigue and other properties. SBS modified asphalt is based on base asphalt, adding a certain proportion of SBS modifier, through shearing, stirring and other methods to make SBS evenly dispersed in asphalt, and form a three-dimensional network structure with base asphalt, so as to effectively improve asphalt Temperature performance, tensile performance, elasticity, cohesive adhesion performance, stability of the mixture, aging resistance, etc. SBS belongs to styrene-based thermoplastic elastom...

AI Technical Summary

Problems solved by technology

[0005] The evaluation of thermal storage stability of modified asphalt by segregation softening point difference is only an evaluation of the difference in high temperature performance between top and bottom asphalt after thermal storage of modified asphalt, and does not directly reflect the degree of segregation of modified asphalt. There is a big difference in the properties of the asphalt at the top and bottom of the middle segregation tube. This difference is only judged by the softening point difference, which may produce certain deviations; although the segregation softening point difference can reflect the thermal storage stability and compatibility of SBS modified asphalt to a certain extent. However, for the segregation test where severe segregation occurs, the top softening point is greatly affected by the casting mold temperature and the phenomenon of "ball piercing", and the discreteness is relatively large, and it is difficult to reflect the further cross-linking and further cross-linking of SBS particles during and after thermal storage Degradation reaction and segregation, so the segregation softening point difference has certain limitations as an evaluation index for modified asphalt segregation

Images