<p>This study explores the impact of two rejuvenators on the moisture susceptibility and cracking resistance of Warm Mix Asphalt (WMA) containing 50% Reclaimed Asphalt Pavement (RAP). The rejuvenators, R1 (triglyceride and fatty acid-based) and R2 (aromatic-based), were applied at optimal dosages of 8.5% and 8%, respectively. A detailed evaluation was conducted using mechanical and chemical tests to assess the performance of the modified asphalt mixtures. These included the Semi-Circular Bending (SCB) test to measure fracture energy and flexibility index, the Indirect Tensile Strength (ITS) test under dry and wet conditions to evaluate moisture resistance, and Fourier Transform Infrared Spectroscopy (FTIR) to analyze all the chemical functional groups present within the rejuvenators. The findings demonstrate that both rejuvenators significantly improved fracture energy and cracking resistance in asphalt mixtures. However, R2 exhibited superior performance in mitigating moisture susceptibility, achieving higher ITS under wet conditions and a higher Tensile Strength Ratio (TSR) compared to R1. Furthermore, both rejuvenators effectively addressed the stiffness challenges associated with aged binders in RAP, enhancing the flexibility and overall mechanical performance of the mixtures. These results highlight the importance of rejuvenators in improving the durability and sustainability of asphalt mixtures, with RA1 and RA2 showing potential to extend pavement life, reduce maintenance costs, and promote more environmentally friendly construction practices. This study provides practical insights into the effective use of rejuvenators for improving the performance of RAP-incorporated WMA, advancing sustainable asphalt technologies.</p>

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Impact of Rejuvenators on Moisture Susceptibility and Cracking in WMA with RAP

  • Wshyar M. Hasan,
  • Sadan A. Mohammed,
  • Rana A. Yousif,
  • Saeid Hesami,
  • Abbas F. Jasim,
  • Sady A. Tayh

摘要

This study explores the impact of two rejuvenators on the moisture susceptibility and cracking resistance of Warm Mix Asphalt (WMA) containing 50% Reclaimed Asphalt Pavement (RAP). The rejuvenators, R1 (triglyceride and fatty acid-based) and R2 (aromatic-based), were applied at optimal dosages of 8.5% and 8%, respectively. A detailed evaluation was conducted using mechanical and chemical tests to assess the performance of the modified asphalt mixtures. These included the Semi-Circular Bending (SCB) test to measure fracture energy and flexibility index, the Indirect Tensile Strength (ITS) test under dry and wet conditions to evaluate moisture resistance, and Fourier Transform Infrared Spectroscopy (FTIR) to analyze all the chemical functional groups present within the rejuvenators. The findings demonstrate that both rejuvenators significantly improved fracture energy and cracking resistance in asphalt mixtures. However, R2 exhibited superior performance in mitigating moisture susceptibility, achieving higher ITS under wet conditions and a higher Tensile Strength Ratio (TSR) compared to R1. Furthermore, both rejuvenators effectively addressed the stiffness challenges associated with aged binders in RAP, enhancing the flexibility and overall mechanical performance of the mixtures. These results highlight the importance of rejuvenators in improving the durability and sustainability of asphalt mixtures, with RA1 and RA2 showing potential to extend pavement life, reduce maintenance costs, and promote more environmentally friendly construction practices. This study provides practical insights into the effective use of rejuvenators for improving the performance of RAP-incorporated WMA, advancing sustainable asphalt technologies.