#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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