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Hesselberg Hydro

Asphaltic Mastic

Structure and Properties

  • An overfilled sand, filler and bitumen mix (typically, 3:1:1)
  • Naturally dense so no compaction needed.
  • Can be poured at working temperatures.
  • Cools to form a viscous, flexible quasi-static mass.
  • Impermeable.
  • Bulk can be increased by adding up to 40% stone (known as Mastic Grout).


  • Component of grouted stone.
  • Component of OSA.
  • Asphalt slabs for lining above and below water.
  • Reinforcing stone revetments.
  • Bed and toe protection.