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
