Abstract
The investigation of aging characteristic of Styrene-Butadiene-Styrene (SBS) modified asphalt binder (PMA) under thermal-humidity conditions is helpful for the application of PMA and the selection of anti-aging technology. Simulated aging tests on styrene-butadiene-styrene (SBS) and SBS-modified asphalt were compared for wet and dry conditions, and the effect of water on the aging of the modified asphalt was investigated using infrared spectroscopy. Aging under wet conditions changed the asphalt performance and caused a more pronounced color change in SBS. An infrared spectral analysis showed that aging under wet conditions increased the carbonyl content of the asphalt and SBS. The presence of water was shown to accelerate the aging of asphalt and SBS under the action of heat and oxygen. This enhanced aging was primarily related to the asphalt components with carbonyl groups, which were further oxidized to carboxylic acids by reacting with water. The double bonds in the SBS chains were also transformed into polar groups via a hydration reaction under thermal-humidity conditions.
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