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Evaluation of Bitumen Modification Using a Fast-Reacting SBS Polymer at a Low Modifier Percentage
Juraj Šrámek1, Matúš Kozel1, Luboš Remek1
1Department of Construction Management, Faculty of Civil Engineering, University of Zilina, Univerzitna 8215/1, 01026 Zilina, Slovakia.
Materials (Basel, Switzerland)
|April 28, 2023
Summary
This study shows that adding a small amount of fast-reacting styrene-butadiene-styrene (SBS) polymer to asphalt bitumen can significantly improve pavement performance and lifespan. This cost-effective modification enhances road durability and economic value over its lifecycle.
Area of Science:
- Materials Science
- Civil Engineering
- Polymer Chemistry
Background:
- Asphalt bitumen is a key component in road construction, but its performance and lifespan can be limited.
- Extending pavement life and improving performance while managing costs is a significant challenge in civil engineering.
Purpose of the Study:
- To investigate the effectiveness of modifying asphalt bitumen with a low percentage (2-3%) of fast-reacting styrene-butadiene-styrene (SBS) polymer.
- To evaluate if this modification can enhance pavement surfacing durability and overall performance at a reduced cost.
- To assess the potential increase in the net present value of pavements through lifecycle cost analysis.
Main Methods:
- Modification of two road bitumens (CA 35/50 and 50/70) with low amounts of fast-reacting SBS polymer.
- Performance testing including needle penetration, softening point (Ring and Ball method), and ductility.
- Analysis of asphalt mixtures with varying coarse-grain curves, including complex modulus tests at different temperatures and fatigue resistance evaluation (Wöhler diagram).
Main Results:
- The low-percentage SBS polymer modification yielded properties comparable to a higher-grade modified bitumen (10/40-65).
- In-lab testing demonstrated a positive impact of the modification on pavement performance characteristics.
- Comparative analysis of modified and unmodified mixtures showed significant improvements in durability and fatigue resistance.
Conclusions:
- Low-percentage modification of asphalt bitumen with fast-reacting SBS polymer is a viable and cost-effective strategy to enhance pavement performance.
- This modification can lead to extended pavement life, reduced road user costs, and improved lifecycle economic value.
- The study confirms the hypothesis that minimal SBS polymer content can achieve substantial improvements in asphalt bitumen properties and pavement durability.
