Method for measuring SBS content in SBS modified asphalts by virtue of DSR

Abstract

The invention discloses a method for measuring an SBS content in SBS modified asphalts by virtue of a dynamic shear rheometer (DSR). The method is carried out according to the following steps: configuring a series of modified asphalts with different SBS admixture amounts and a standard SBS content, and carrying out an RTFOT ageing experiment; then carrying out a repeated creep recovery experiment by virtue of the DSR to form a creep recovery graph; calculating the average value Jnr@sigma of a plurality of circulating unrecoverable creep compliances of the modified asphalt RTFOT ageing samples with the various SBS admixture amounts, and the average value Rec@sigma of elastic recovery rates; drawing a Jnr@sigma content curve and a Rec@sigma-SBS content curve; carrying out the RTFOT ageing experiment and the repeated creep recovery experiment on the SBS content to be measured to obtain the unrecoverable creep compliances Jnr@sigma and the elastic recovery rates Rec@sigma of the test samples; and reading the SBS contents CJ and CR on the content curves, wherein the SBS content of the test samples is (CJ+CR) / 2. The method is simple to operate, high in applicability, and accurate and reliable in test result.

Description

technical field [0001] The invention relates to the technical field of asphalt, in particular to a method for measuring the SBS content in SBS modified asphalt by using DSR. Background technique [0002] In recent years, in the construction of highway asphalt pavement in my country, the proportion of modified asphalt pavement continues to increase. Compared with other modifiers (such as PE, EVA, SBR, etc.), SBS has obvious advantages in improving high and low temperature performance, elastic recovery ability, temperature sensitivity, etc. Mainly modified asphalt. With the in-depth research on modified asphalt at home and abroad, a large number of research results have been obtained on the modification mechanism, modification process, material influencing factors, and road performance of SBS modified asphalt. However, the conventional indicators of SBS modified asphalt (penetration, softening point, ductility, etc.) cannot characterize or reflect the content of modifier SBS...

AI Technical Summary

Problems solved by technology

Generally, the detection institutions in the transportation industry basically do not have the instruments and equipment used for infrared spectroscopy and GPC determination, and it is difficult to have relevant detection conditions; although the potentiometric titration method has simple instruments, it is greatly affected by human factors. It is often black, and the titration solution and iodine are in an incompatible system, which makes the titration reaction slow and the color change at the end point is not obvious, which affects the accuracy of the test results

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