6.1 General. Hot-mix asphaltudes many different types of mixtures of aggregate and asphalt cement (binder) produced at elevated temperatures (generally betweenºF) in an asphalt plant. Typically, HMA mixtures are divided into three mixture categories: dense-graded; open-graded; and gap-graded as a.specification for stone crushing for roads. Stone Crusher Road Linndale. Description. The models of the series Stone Crusher Road (STC/R and STCH/R) are the ideal solution for road construction works, for the maintece and levelling of dirt roads, forestry roads or skiing slopes and for every kind of application where stone crushing is required.what is the size of crusher run gravel Flex Base is a flexible base course material that is most often used for driveways and temporary roadways A driveway needs layered gravel to provide stability for vehicles At least 50 percent of the material retained on the 1 in Gravel Spreader Market Size, Development, Key Opportunity, Application Aggregates are also divided into fine and coarse aggregates. For effective performance, aggregate must be clean, hard, tough, strong and durable and of proper grading. Other aggregates such as slag, expanded clay, shale and exfoliated vermiculites are unsuitable for reinforced concrete construction (Oyenuga, 2001).