Asphalt Specialists In Hydraulic Engineering


Geomat DM20
Lean Sand Asphalt
Open Stone Asphalt / Mattresses
Asphaltic Mastic / Mastic Grout
Dense Stone Asphalt
Dense Asphaltic Concrete
Bituminous Membranes
Marine Mastic Granules
Sarmac Mattresss
Profix Mattresses

Open Stone Asphalt

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

Open Stone Asphalt


  • 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