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<p>The surface free energy (SFE) measurement of asphalt binders and aggregates is widely recognized as a reliable method for evaluating the moisture-induced damage potential of asphalt mixes. In this study, the SFE method was used to assess the effects of Reclaimed Asphalt Pavement (RAP) binder content, a fixed percentage of pyrolytic oil (PO), and different aggregate or steel slag types on the moisture-induced damage resistance of asphalt mixtures. The SFE components of base asphalt binder (Viscosity Grade (VG30)) was analyzed after blending with varying amounts of RAP binder (10%, 20%, and 30%) and after adding PO to both base and RAP-modified binders. The study also examined the improved variations in contact angle and SFE components of the base and modified binders across different aging times (0, 45, 85, and 150&#xa0;min) using a rolling thin film oven (RTFO). Contact angle measurements were conducted using the sessile drop method on binder samples coated on microscope glass plates. Additionally, the SFE components of two natural aggregates (Granite and Basalt) and two types of steel slag (BOF and EAF) were considered. Energy ratio (ER) parameters, derived from the work of cohesion, adhesion, and debonding, were used to evaluate the moisture-induced damage resistance of various modified binder (RAP/RAP + PO) asphalt binder—aggregate/slag combinations. The results indicated that the acid SFE component of VG30 asphalt binders increased with the addition of RAP binder up to 20%, while the base SFE component improved with up to 30% RAP binder. Furthermore, the work of adhesion and debonding improved for all RAP-modified binders up to 85 min of aging. However, the addition of PO to both base and RAP-modified binders resulted in a decrease in work of adhesion and debonding parameters. ER analysis revealed that moisture-induced damage resistance increased with RAP binder content up to 20% for VG30 binders across all types of aggregates and slags. However, the addition of PO led to a decrease in ERs, indicating decreasing bonding and debonding properties of binder-aggregate or binder-slag compatibility. The study also found that higher total SFE values for granite, BOF, and EAF corresponded to lower energy ratio parameter values, suggesting that a higher total SFE component in aggregate or slags may result in greater moisture-induced damage potential in the mix. Therefore, ER values could serve as a predictive tool for highway agencies in selecting suitable binder-aggregate or binder-slag combinations to enhance pavement durability.</p>

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Evaluation of natural aggregate and steel slag compatibility with asphalt binder containing recycled asphalt pavement binder and pyrolytic oil: based on surface free energy approach

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Shubham Suryawanshi,
  • Aniket Kataware,
  • Hemantkumar Hadole,
  • M. S. Ranadive

摘要

The surface free energy (SFE) measurement of asphalt binders and aggregates is widely recognized as a reliable method for evaluating the moisture-induced damage potential of asphalt mixes. In this study, the SFE method was used to assess the effects of Reclaimed Asphalt Pavement (RAP) binder content, a fixed percentage of pyrolytic oil (PO), and different aggregate or steel slag types on the moisture-induced damage resistance of asphalt mixtures. The SFE components of base asphalt binder (Viscosity Grade (VG30)) was analyzed after blending with varying amounts of RAP binder (10%, 20%, and 30%) and after adding PO to both base and RAP-modified binders. The study also examined the improved variations in contact angle and SFE components of the base and modified binders across different aging times (0, 45, 85, and 150 min) using a rolling thin film oven (RTFO). Contact angle measurements were conducted using the sessile drop method on binder samples coated on microscope glass plates. Additionally, the SFE components of two natural aggregates (Granite and Basalt) and two types of steel slag (BOF and EAF) were considered. Energy ratio (ER) parameters, derived from the work of cohesion, adhesion, and debonding, were used to evaluate the moisture-induced damage resistance of various modified binder (RAP/RAP + PO) asphalt binder—aggregate/slag combinations. The results indicated that the acid SFE component of VG30 asphalt binders increased with the addition of RAP binder up to 20%, while the base SFE component improved with up to 30% RAP binder. Furthermore, the work of adhesion and debonding improved for all RAP-modified binders up to 85 min of aging. However, the addition of PO to both base and RAP-modified binders resulted in a decrease in work of adhesion and debonding parameters. ER analysis revealed that moisture-induced damage resistance increased with RAP binder content up to 20% for VG30 binders across all types of aggregates and slags. However, the addition of PO led to a decrease in ERs, indicating decreasing bonding and debonding properties of binder-aggregate or binder-slag compatibility. The study also found that higher total SFE values for granite, BOF, and EAF corresponded to lower energy ratio parameter values, suggesting that a higher total SFE component in aggregate or slags may result in greater moisture-induced damage potential in the mix. Therefore, ER values could serve as a predictive tool for highway agencies in selecting suitable binder-aggregate or binder-slag combinations to enhance pavement durability.