1. School of Materials Science and Engineering; The University of New South Wales; Sydney NSW 2052 Australia
2. School of Mechnical Engineering; Xinjiang University; Urumqi Xinjiang 830047 China
3. Institute for Infrastructure Engineering; University of Western Sydney Penrith; New South Wales 2751 Australia
4. Dept. of Chemical Engineering, Laboratory for Simulation and Modelling of Particulate Systems; Monash University; Clayton Vic 3800 Australia