Materials

Open Stone Asphalt

Structure and Properties

• An underfilled, gap-graded mixture of mastic and limestone (other rocks may be substituted where water is acidic or abrasion is likely)
  
  
• Permeable
  
  
• Strong and porous so it absorbs wave energy without damage
  
  
• Can be placed on slopes up to 1:1.5
  
  
• Follows all shapes and contours when placed in situ above the waterline
  
  
• Can be placed underwater as prefabricated mattresses

Applications

• Armour layer for river training
  
  
• Armour layer for revetments in flood control and coastal protection
  
  
• Armour layer for dam upstream faces
  
  
• Armour layer for spillways and dam downstream faces
  
  
• Scour protection for quays