Macadam ( Pre-mix )

• Macadams are materials which rely on particle interlock to provide strength and stiffness . 
• They normally contain a wide range of particles sizes . 
• Macadams coated with a bituminous binder are described as coated macadams . 
• The bitumen acts as a lubricant as well as binder during compaction . 
• Macadams use smaller quantities of bitumen than asphalt . Hence , cost is cheaper than asphalt .