INTRODUCTION

The use of SBS as an asphalt modifier was developed by the Shell Chemical Company (1, 2). It has been recognized that the physical and mechanical properties and rheological behavior of conventional asphalt compositions can be improved by the addition of SBS (3). SBS exhibits a two-phase morphology consisting of glassy polystyrene (PS) domains connected together by the rubber polybutadiene (PB) segments at the temperatures between glass transition temperatures of the PB and PS, so SBS exhibits crosslinked elastomer network behavior. Above the glass ...

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