#6891. Using survival and atrophy to understand the effect of RAP on moisture-induced damage susceptibility of asphalt mixes

December 2026publication date
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Journal’s subject area:
Civil and Structural Engineering;
Mechanics of Materials;
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Abstract:
Moisture-induced stress tester (MIST) has been recently developed to simulate the dynamic stresses that cause moisture damage. In the current study, asphalt mixes containing 0%, 10%, 20%, 30%, and 40% RAP were subjected to 0, 1000, 20XX, 3500, 5000, and 10,000 stress cycles of MIST and IDT strength test was conducted. The test results were analysed using the concepts of survival and atrophy to propose a damage mechanism and suggest an alternative to TSR. In unconditioned state, the control mix depicted a superior survival as compared to RAP mixes with [removed]20% RAP. Rate of atrophy indicated that the control mix has a higher instantaneous potential to fail (2.34 MPa in unconditioned state for control mix) than RAP mixes (0.90, 1.07, 1.13 and 1.21 MPa for 10%, 20%, 30%, and 40% RAP mix, respectively, in the unconditioned state). Stiffness and peak stress carrying capacity for control mix in unconditioned state was 310.87 and 1.47 MPa, respectively, which was higher than RAP mixes. For RAP mixes, MDRs based on rate of atrophy and TSR were > 80% thereby indicating that RAP has the potential to improve the moisture-induced damage resistivity of asphalt mixes.
Keywords:
asphalt mixes; atrophy; Moisture damage; moisture-induced stress tester; recycled asphalt pavement; stress–strain curve; survival

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