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<p>This research investigates the influence of moisture-induced degradation in hot mix asphalt (HMA), a critical issue that affects the performance and durability of asphalt pavements. To address this problem, the study examines the effect of adding a 0.3% amine-free anti-stripping agent based on the weight of the asphalt binder. The Marshall method was employed to prepare modified and unmodified samples with air voids of 7 ± 0.5, and a vacuum device was used with varying saturation times (5, 10, and 15&#xa0;min) to simulate moisture exposure. Saturation degree, Indirect Tensile Strength (ITS), and Tensile Strength Ratio (TSR) were utilised to evaluate performance. The results revealed that the modified mixes exhibited lower moisture content and greater moisture resistance compared to the unmodified mixes. In comparison to the unmodified mix, the modified mix demonstrated improved Marshall stability at 40&#xa0;min, 24&#xa0;h, and 48&#xa0;h, a lower First Durability Index (FDI) and Second Durability Index (SDI), and a higher Retained Strength Index (RSI). Regression analysis indicated strong correlations, with R² values confirming the effectiveness of the additive. Overall, the study underscores that the amine-free anti-stripping agent enhances tensile strength, moisture resistance, and stability, particularly under short-term moisture exposure. These findings illuminate the potential of such additives to enhance the durability and performance of asphalt pavements.</p>

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Enhancing moisture resistance in hot mix asphalt: evaluating the effectiveness of amine-free anti-stripping agents

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月2日

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  • Bayan Abdullah Taha,
  • Suad Kamiran Rasheed,
  • Zaid Hazim Al-Saffar,
  • Hasanian Radhi Radeef,
  • Anmar Dulaimi

摘要

This research investigates the influence of moisture-induced degradation in hot mix asphalt (HMA), a critical issue that affects the performance and durability of asphalt pavements. To address this problem, the study examines the effect of adding a 0.3% amine-free anti-stripping agent based on the weight of the asphalt binder. The Marshall method was employed to prepare modified and unmodified samples with air voids of 7 ± 0.5, and a vacuum device was used with varying saturation times (5, 10, and 15 min) to simulate moisture exposure. Saturation degree, Indirect Tensile Strength (ITS), and Tensile Strength Ratio (TSR) were utilised to evaluate performance. The results revealed that the modified mixes exhibited lower moisture content and greater moisture resistance compared to the unmodified mixes. In comparison to the unmodified mix, the modified mix demonstrated improved Marshall stability at 40 min, 24 h, and 48 h, a lower First Durability Index (FDI) and Second Durability Index (SDI), and a higher Retained Strength Index (RSI). Regression analysis indicated strong correlations, with R² values confirming the effectiveness of the additive. Overall, the study underscores that the amine-free anti-stripping agent enhances tensile strength, moisture resistance, and stability, particularly under short-term moisture exposure. These findings illuminate the potential of such additives to enhance the durability and performance of asphalt pavements.