Assessment of different long-term aging effect on FAM mixtures

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. LinearVisco-Elastic (LVE) limit of each FAMmixtures was initially determined by conducting strain sweep test.Viscoelastic properties (|G∗| and δ) and master curve shape parameters of FAMmixtures were further determined from temperature and frequency sweep test. Fatigue cracking of FAMmixtures was evaluated using G-R parameter. Irrespective of the aging level applied to the FAM specimen, LVE limit was found almost constant for all FAMmixtures.Viscoelastic properties for FAMspecimen 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. © 2021 Taylor & Francis Group, London.