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<p>This study investigates the flow behaviour and phase stability of bituminous binders modified using a composite system of Styrene Butadiene Rubber (SBR) and nano-sized calcium carbonate (CaCO<sub>3</sub>). Multiple binder formulations were developed with varying SBR contents (3%, 4% and 5%) while keeping Nano-CaCO<sub>3</sub> constant at 4% to evaluate their effectiveness in improving high-temperature performance and blend homogeneity. The experimental program included conventional binder tests (penetration, softening point, and ductility), rotational viscosity at 135&#xa0;°C, Superpave rutting parameter assessment (G*/Sin δ), failure temperature determination, and Multiple Stress Creep and Recovery (MSCR) testing. Results demonstrated that composite modification significantly reduced penetration values while increasing softening point and viscosity, indicating enhanced stiffness and rutting resistance. MSCR results showed notable reductions in non-recoverable creep compliance (Jnr) and improvements in elastic recovery (R%), particularly at higher SBR dosages. The modified binders also exhibited increased failure temperatures, reflecting improved thermal resistance. Among all formulations, 4S + 4C and 5S + 4C binders provided superior rutting resistance but exhibited elevated viscosity exceeding recommended workability limits. Overall, the SBR/Nano-CaCO<sub>3</sub> composite system effectively enhances asphalt binder mechanical performance and phase stability, offering a promising approach for pavement applications.</p> Graphical Abstract <p></p>

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Synergistic effects of SBR polymer and nano-CaCO3 on rheological performance and stability of asphalt binder

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Mohammed Ibrahim,
  • Mohammad Shafi Mir

摘要

This study investigates the flow behaviour and phase stability of bituminous binders modified using a composite system of Styrene Butadiene Rubber (SBR) and nano-sized calcium carbonate (CaCO3). Multiple binder formulations were developed with varying SBR contents (3%, 4% and 5%) while keeping Nano-CaCO3 constant at 4% to evaluate their effectiveness in improving high-temperature performance and blend homogeneity. The experimental program included conventional binder tests (penetration, softening point, and ductility), rotational viscosity at 135 °C, Superpave rutting parameter assessment (G*/Sin δ), failure temperature determination, and Multiple Stress Creep and Recovery (MSCR) testing. Results demonstrated that composite modification significantly reduced penetration values while increasing softening point and viscosity, indicating enhanced stiffness and rutting resistance. MSCR results showed notable reductions in non-recoverable creep compliance (Jnr) and improvements in elastic recovery (R%), particularly at higher SBR dosages. The modified binders also exhibited increased failure temperatures, reflecting improved thermal resistance. Among all formulations, 4S + 4C and 5S + 4C binders provided superior rutting resistance but exhibited elevated viscosity exceeding recommended workability limits. Overall, the SBR/Nano-CaCO3 composite system effectively enhances asphalt binder mechanical performance and phase stability, offering a promising approach for pavement applications.

Graphical Abstract