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<p>Improving the performance of asphalt pavements is crucial for maintaining safe and efficient transportation networks over time. Adopting advanced mix designs, incorporating waste products, and utilizing polymer modification can enhance the durability, sustainability, and cost-effectiveness of asphalt pavements. While previous studies have emphasized the effect of adding acrylonitrile-butadiene-styrene (ABS) and styrene-butadiene-styrene (SBS) polymers with carbon-sulfur as a filler, this study investigated the comparative performance of these mixtures under oxidative aging impact, focusing on mechanical properties, durability, and failure mechanisms. Modified binders were prepared using 5% SBS and varying ABS concentrations (0.5%, 1.0%, and 1.5%) blended with base asphalt (N-AC), with carbon-sulfur serving as the filler. Mixtures underwent short-term aging (STA: 135&#xa0;°C for 4&#xa0;h) and long-term aging (LTA: 85&#xa0;°C for 120&#xa0;h) to simulate field aging conditions. Mechanical behaviour was assessed via Marshall stability, indirect tensile strength (ITS), Kim, and semi-circular bending (SCB) tests. Results indicated that 1.0% ABS-modified mixtures exhibited optimal performance, achieving the highest Marshall stability (18.5 kN) and improved inter particle bonding compared to unmodified and SBS-modified counterparts. Aging significantly enhanced dry strength in all mixtures, with BN (unmodified) showing maximum hardening under LTA. Wet conditions exacerbated degradation, particularly in SBS-modified mixtures (BS), which exhibited lower moisture resistance and energy absorption compared to ABS blends. SCB testing revealed notch-depth sensitivity, with 17&#xa0;mm notches yielding the lowest critical stress intensity factors (Jc). Statistical analysis confirmed significant interactions between polymer type, dosage, and aging severity, highlighting ABS’s ability to moderate oxidative aging effects at intermediate concentrations. However, excessive ABS (1.5%) induced stiffness-related drawbacks, including reduced workability and compaction efficiency. Notably, SBS demonstrated superior rutting resistance via Kim test. These findings underscore the potential of carbon-sulfur waste as a sustainable filler in polymer-modified asphalt, offering cost-effective solutions for aging-prone road pavements.</p>

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Comparative Performance of Carbon-Sulfur Asphalt Mixtures Containing ABS and SBS Polymers Under Short and Long-Term Aging Impact

  • 期刊论文

  • 发表日期：

    2025年11月16日

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  • Nabaa H. Hasan,
  • A. I. Al-Hadidy

摘要

Improving the performance of asphalt pavements is crucial for maintaining safe and efficient transportation networks over time. Adopting advanced mix designs, incorporating waste products, and utilizing polymer modification can enhance the durability, sustainability, and cost-effectiveness of asphalt pavements. While previous studies have emphasized the effect of adding acrylonitrile-butadiene-styrene (ABS) and styrene-butadiene-styrene (SBS) polymers with carbon-sulfur as a filler, this study investigated the comparative performance of these mixtures under oxidative aging impact, focusing on mechanical properties, durability, and failure mechanisms. Modified binders were prepared using 5% SBS and varying ABS concentrations (0.5%, 1.0%, and 1.5%) blended with base asphalt (N-AC), with carbon-sulfur serving as the filler. Mixtures underwent short-term aging (STA: 135 °C for 4 h) and long-term aging (LTA: 85 °C for 120 h) to simulate field aging conditions. Mechanical behaviour was assessed via Marshall stability, indirect tensile strength (ITS), Kim, and semi-circular bending (SCB) tests. Results indicated that 1.0% ABS-modified mixtures exhibited optimal performance, achieving the highest Marshall stability (18.5 kN) and improved inter particle bonding compared to unmodified and SBS-modified counterparts. Aging significantly enhanced dry strength in all mixtures, with BN (unmodified) showing maximum hardening under LTA. Wet conditions exacerbated degradation, particularly in SBS-modified mixtures (BS), which exhibited lower moisture resistance and energy absorption compared to ABS blends. SCB testing revealed notch-depth sensitivity, with 17 mm notches yielding the lowest critical stress intensity factors (Jc). Statistical analysis confirmed significant interactions between polymer type, dosage, and aging severity, highlighting ABS’s ability to moderate oxidative aging effects at intermediate concentrations. However, excessive ABS (1.5%) induced stiffness-related drawbacks, including reduced workability and compaction efficiency. Notably, SBS demonstrated superior rutting resistance via Kim test. These findings underscore the potential of carbon-sulfur waste as a sustainable filler in polymer-modified asphalt, offering cost-effective solutions for aging-prone road pavements.