ABSTRACT
Since the late 19th century, asphalt concrete (AC) has been widely used as the surface layer materials for the construction of roads, highways, runways and parking areas (Roberts et al. 2002). AC mainly consists of asphalt, fine and coarse aggregates. Sometimes, a small percentage of additives is added to the mix for special engineering properties. Different mix design formulae produce different asphalt concretes after hot compaction. The AC mix design is to determine a suitable asphalt content for selected aggregates so that a desired or optimal internal structure can be produced with roller or other compaction tools in the field. The key criterion for an optimal mix design is to allow the AC pavement have traffic serviceability over long time.
