The typical system blends SBS polymer with virgin asphalt, or bitumen, to make polymer-modified asphalt cement (PMAC). The stationary system pictured here at an asphalt terminal includes a box dumper, a polymer hopper, an auger (screw conveyor), two mixing tanks and a let-down tank for the modified bitumen. Tanks and other components are heated by thermal fluid from a helical coil heater. SBS polymer pellets make multiple passes through a mill that shears them into smaller pieces for optimum blending. Optimum blending is also aided by elevated temperatures. Similar systems are available for ground rubber.
Heatec also makes skid-mounted polymer plants for export. These smaller systems are specifically designed for ease of shipping and installation.