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<p>Fatigue cracking is a significant concern in asphalt pavements, affecting their longevity and structural performance. This research investigates the fatigue resistance of bituminous concrete grade-II (BC-II) mixes incorporating 40% reclaimed asphalt pavement (RAP) and a bio-oil rejuvenator under short-term aging conditions. Three aging scenarios were evaluated: unaged, laboratory-aged (short-term aged mix as per AASHTO R30), and field-aged (plant-produced, reheated, and compacted). Fatigue performance was assessed using an indirect tensile fatigue test (ITFT) at stress levels of 300, 400, and 500&#xa0;kPa, along with resilient modulus (MR) and cumulative dissipated energy (CDE) analysis. The 40% RAP mix (R40) consistently outperformed the control mix (CM), with fatigue life improvements ranging from 19.56 to 25.33% across all aging conditions and stress levels. The fatigue model based on strain and stiffness achieved an R<sup>2</sup> &gt; 0.90, confirming its predictive reliability. Three-way ANOVA showed that RAP content, aging, and strain significantly affected fatigue life (<i>p</i> &lt; 0.001), with key interaction effects. IITPAVE analysis validated that R40-F achieved 7.2 to 11.4% higher fatigue life than CM across asphalt thicknesses from 80 to 180&#xa0;mm. These results confirm that rejuvenated high RAP mixes offer enhanced fatigue durability and structural integrity, supporting their sustainable use in surface course applications in India.</p>

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Fatigue Failure Assessment of Asphalt Mixtures Containing 40% Reclaimed Asphalt Pavement (RAP) Under Short-Term Aging Conditions

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Bicky Agarwal,
  • Ambika Behl,
  • Rajiv Kumar,
  • Ashish Dhamaniva

摘要

Fatigue cracking is a significant concern in asphalt pavements, affecting their longevity and structural performance. This research investigates the fatigue resistance of bituminous concrete grade-II (BC-II) mixes incorporating 40% reclaimed asphalt pavement (RAP) and a bio-oil rejuvenator under short-term aging conditions. Three aging scenarios were evaluated: unaged, laboratory-aged (short-term aged mix as per AASHTO R30), and field-aged (plant-produced, reheated, and compacted). Fatigue performance was assessed using an indirect tensile fatigue test (ITFT) at stress levels of 300, 400, and 500 kPa, along with resilient modulus (MR) and cumulative dissipated energy (CDE) analysis. The 40% RAP mix (R40) consistently outperformed the control mix (CM), with fatigue life improvements ranging from 19.56 to 25.33% across all aging conditions and stress levels. The fatigue model based on strain and stiffness achieved an R2 > 0.90, confirming its predictive reliability. Three-way ANOVA showed that RAP content, aging, and strain significantly affected fatigue life (p < 0.001), with key interaction effects. IITPAVE analysis validated that R40-F achieved 7.2 to 11.4% higher fatigue life than CM across asphalt thicknesses from 80 to 180 mm. These results confirm that rejuvenated high RAP mixes offer enhanced fatigue durability and structural integrity, supporting their sustainable use in surface course applications in India.