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<p>This study presents a direct comparative evaluation of acrylonitrile–butadiene–styrene (ABS) and styrene–butadiene–styrene (SBS) modified hot-mix asphalt (HMA) under controlled AASHTO R30 short-term (STA) and long-term aging (LTA) conditions. Dense-graded blends with the same design and constant optimum asphalt content (OAC) of 5 percent were tested in terms of rutting (S<sub>D</sub>), moisture resistance (ITS/TSR) and cracking resistance (SCB at 17, 21, and 25&#xa0;mm notch depths). Results indicate that 5% SBS modification enhanced deformation strength (S<sub>D</sub>​) by approximately 40–50% compared to unmodified mixtures, proving superior for high-temperature rutting resistance. Conversely, 0.5–1.0% ABS dosage optimally improved fracture energy (Gf) and tensile strength ratio (TSR) by 15–25%, effectively mitigating aging-induced brittleness and moisture damage. Consequently, SBS is recommended for high-temperature, rutting-prone environments, while 0.5–1.0% ABS is optimal for climates susceptible to thermal cracking and moisture distress. This study provides the first statistically validated selection matrix correlating specific polymer dosages to climate-induced distress priorities under identical mixture design and standardized aging conditions, filling a critical gap in comparative pavement engineering literature.</p>

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Comparative Performance of the HMA Containing SBS and ABS Under AASHTO R30 Aging Conditions

  • 期刊论文

  • 发表日期：

    2026年4月14日

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

摘要

This study presents a direct comparative evaluation of acrylonitrile–butadiene–styrene (ABS) and styrene–butadiene–styrene (SBS) modified hot-mix asphalt (HMA) under controlled AASHTO R30 short-term (STA) and long-term aging (LTA) conditions. Dense-graded blends with the same design and constant optimum asphalt content (OAC) of 5 percent were tested in terms of rutting (SD), moisture resistance (ITS/TSR) and cracking resistance (SCB at 17, 21, and 25 mm notch depths). Results indicate that 5% SBS modification enhanced deformation strength (SD​) by approximately 40–50% compared to unmodified mixtures, proving superior for high-temperature rutting resistance. Conversely, 0.5–1.0% ABS dosage optimally improved fracture energy (Gf) and tensile strength ratio (TSR) by 15–25%, effectively mitigating aging-induced brittleness and moisture damage. Consequently, SBS is recommended for high-temperature, rutting-prone environments, while 0.5–1.0% ABS is optimal for climates susceptible to thermal cracking and moisture distress. This study provides the first statistically validated selection matrix correlating specific polymer dosages to climate-induced distress priorities under identical mixture design and standardized aging conditions, filling a critical gap in comparative pavement engineering literature.