Comprehensive thermal analysis method of content of SBS in SBS modified asphalt

Abstract

The invention relates to a comprehensive thermal analysis method of the content of SBS in SBS modified asphalt. The method comprises the steps as follows: modified asphalt samples with known SBS content form a standard group, the TG (thermogravimetry) and DSC (differential scanning calorimetry) curves of the modified asphalt standard group are acquired with a comprehensive thermal analyzer; a DTGcurve is obtained, linear fitting is performed on the SBS content of the modified asphalt standard group and the temperature corresponding to third weight loss peak in the DTG curve, and a linear regression equation of SBS content-temperature is established; the heat absorption and release value in a DSC curve is calculated, and a linear regression equation of SBS content-heat absorption and release value is established; the TG and DSC curves of a to-be-tested modified asphalt sample are acquired, the temperature corresponding to the third weight loss peak on the DTG curve and the heat absorption and release value of the DSC curve are obtained with software; the SBS content of the to-be-tested modified asphalt sample is calculated as omega 1 and omega 2 in combination of the two linear regression equations, and the SBS content of the to-be-tested sample is (omega 1+omega 2) / 2. The content of SBS in the SBS modified asphalt is measured in combination of TG and DSC analysis, few the human factors exist, and the accuracy is high.

Description

technical field [0001] The invention relates to a detection method for SBS content in SBS modified asphalt, in particular to a comprehensive thermal analysis method for SBS content in SBS modified asphalt. Background technique [0002] Asphalt is often used as a cementing material for pavement structures in road engineering, but pure asphalt can no longer meet the high requirements of heavy-duty traffic and social development for road quality. At present, commonly used SBS (styrene-butadiene-styrene block copolymer), SBR (styrene-butadiene rubber), EVA (ethylene-vinyl acetate copolymer), PE (polyethylene), CR (chloroprene rubber), etc. Polymer modified asphalt, among them, SBS modified asphalt is widely used in pavement construction because of its improvement in temperature sensitivity, elastic recovery, high and low temperature performance, etc. [0003] The content of modifier SBS in SBS modified asphalt plays a decisive role in the performance of SBS modified asphalt. I...

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Problems solved by technology

In the relevant data of SBS content detection, although there are precedents of measuring the content of SBS modified asphalt modifier by thermogravimetric analysis (Zhang Dongxing, Zhao Weiwei, Zhang Zhaohong, etc. Thermogravimetric analysis [J]. Highway Engineering, 2014 (04): 73-77.), but the separate thermogravimetric curve is affected by the molecular composition and structure of SBS, and the error of the test result is large

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