Abstract
Aging is considered as one of the major factors which increase stiffness and brittleness to asphaltic mixture. This study aimed at evaluating the effect of different aging protocol on viscoelastic and fatigue cracking of Fine Aggregate Matrix (FAM) mixtures. To evaluate this, six different long-term aging levels were considered. Linear Visco-Elastic (LVE) limit of each FAM mixtures was initially determined by conducting strain sweep test. Viscoelastic properties (|G*| and δ) and master curve shape parameters of FAM mixtures were further determined from temperature and frequency sweep test. Fatigue cracking of FAM mixtures was evaluated using G-R parameter. Irrespective of the aging level applied to the FAM specimen, LVE limit was found almost constant for all FAM mixtures. Viscoelastic properties for FAM specimen aged for 24 hrs at 135°C, and 12 days at 95°C aged FAM mixtures showed similar results from the master curve plots. Despite of the similar viscoelastic properties, the FAM mixtures with 12 days at 95°C and 24 hrs at 135°C were not shown similar crack potential.
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