Fundamental properties (e.g. compatibility, storage stability and rheological properties) of styrene-butadiene-styrene (SBS) polymer modified bitumens were studied using dynamic mechanical analysis, fluorescence microscopy and conventional binder test methods. The modified binders were prepared using a laboratory mixer. Five bitumens from four sources were mixed with two SBS polymers at different polymer content levels. The results showed that the properties of the modified binders were influenced simultaneously by bitumen composition and SBS content and structure. To obtain optimum properties, a matching of these variables is required.
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