Abstract
Asphalt is a visco-elastic material having properties of elastic solid at low temperature and
viscous liquid at high temperature. Properties of asphalt binder depend upon temperature, rate of
loading and aging conditions. Although asphalt binder is only 4-5 % of asphalt concrete mix by weight
but it plays a vital role in defining the pavement performance. That is, pavement response is heavily
dependent upon the viscous and elastic properties of asphalt. In this research six asphalt samples were
obtained from Attock and Karachi oil refinery and Dynamic Shear Rheometer was used in the
laboratory to evaluate their viscous and elastic properties. Witczak predictive model was used to
predict the binder viscosity and phase angle by using complex shear modulus and viscosity
temperature susceptibility. The study revealed that Karachi virgin asphalt grades are more elastic as
compared to Attock virgin asphalt grades both at low and high temperature. Similarly Attock PMB is
more stiff and elastic as compared to Karachi 40/50, 60/70, and Attock 60/70. The research also
revealed that Attock PMB has lesser temperature susceptibility as compared to virgin grades which
makes it more suitable to resist rutting and cracking in extreme climatic conditions of Pakistan.
M. A. Javid, A. Rahim. (2011) Characterization of Visco-Elastic Properties of Locally Available Asphalts in Pakistan, Pakistan Journal of Engineering and Applied Sciences, Volume 9, Issue 1.
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