#paving_material  material used for pavement
  supertype:  artifact__artefact  a man-made object taken as a whole
  subtype:  asphalt  mixed asphalt and crushed gravel or sand; used especially for paving but also for roofing
  subtype:  concrete  a strong hard building material composed of sand and gravel and cement and water
     subtype:  cement.concrete  concrete pavement is sometimes referred to as cement; "they stood on the gray cement beside the pool"
     subtype:  reinforced_concrete__ferroconcrete  concrete with metal and/or mesh added to provide extra support against stresses
  subtype:  blacktop__blacktopping  a black bituminous material used for paving roads or other areas; usually spread over crushed rock
  subtype:  macadam  broken stone used in macadamized roadways
  subtype:  tarmacadam__tarmac  a paving material of tar and broken stone; mixed in a factory and shaped during paving
  subtype:  paving.paving_material__pavement  material used to pave an area

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