Degradation of SBS Polymer during Laboratory Aging of Asphalt Mixture
Publication: Airfield and Highway Pavements 2021
ABSTRACT
The performance of styrene-butadiene-styrene (SBS) modified asphalt binder deteriorates in the service life possibly because SBS polymer degrades due to aging. Currently, there is no specific test method for the determination of SBS polymer degradation. In this study, a novel dynamic shear rheometer (DSR)-based extensional deformation test was performed to determine the SBS degradation in the asphalt mixture with SBS modified binder due to laboratory aging. AASHTO R30 mixture aging and 1-Day forced-draft oven mixture aging at 135°C were performed in the laboratory to simulate the field aging. Sentmanat extensional rheometer (SER) was inserted inside the DSR host system to perform the extensional deformation test. Two peaks were obtained from the novel test: first peak elongation force (F1) indicated binder’s stiffness, and second peak elongation force (F2) indicated elastomeric polymer characteristics. After obtaining the F2 value from the mixture extracted SBS modified binder, it was compared to an equally stiff SBS modified asphalt binder. The reduction in the SBS polymer’s elongation force (F2 value) was considered as the degradation. This study found that the SBS polymer degraded when the asphalt mixture with SBS modified binder was being aged in the laboratory. Also, the aging temperature played a significant role in the degradation of SBS polymer.
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Airfield and Highway Pavements 2021
Pages: 135 - 146
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© 2021 American Society of Civil Engineers.
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Published online: Jun 4, 2021
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