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Study on Styrene-Butadiene-Styrene Modified Asphalt Binders Relaxation at Low Temperature
Sylwia Dziadosz1, Mieczysław Słowik2, Filip Niwczyk3
1Faculty of Civil and Transport Engineering, Poznan University of Technology, Piotrowo 3, 60-965 Poznań, Poland.
Materials (Basel, Switzerland)
|June 2, 2021
Summary
This study investigated asphalt binder relaxation at low temperatures using styrene-butadiene-styrene (SBS) modified binders. Higher SBS content accelerates relaxation, while aging slows it, with increased SBS reducing aging
Area of Science:
- Materials Science
- Civil Engineering
- Polymer Science
Background:
- Asphalt binders are crucial in road construction.
- Understanding low-temperature relaxation is vital for pavement durability.
- Polymer modification enhances asphalt binder performance.
Purpose of the Study:
- To investigate the low-temperature relaxation behavior of polymer-modified asphalt binders.
- To evaluate the effect of styrene-butadiene-styrene (SBS) content on relaxation.
- To assess the impact of short-term aging on relaxation properties.
Main Methods:
- Laboratory investigation using a ductilometer with tensile tests.
- Testing polymer-modified asphalt binders with varying SBS content (3%–7.5%).
- Performing tests at -16 °C before and after Rolling Thin Film Oven Test (RTFOT) aging.
Main Results:
- Increased SBS copolymer content accelerates the relaxation process in asphalt binders.
- Short-term aging (RTFOT) was found to slow down the relaxation phenomenon.
- Higher SBS elastomer content reduces the impact of aging on low-temperature stress relaxation.
Conclusions:
- SBS modification significantly influences asphalt binder relaxation dynamics at low temperatures.
- Aging effects on stress relaxation are mitigated by higher concentrations of SBS.
- The findings provide insights for designing durable asphalt pavements for cold climates.
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