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Product Information
Technical Datasheet
Safety Datasheet


Conbextra UW is supplied as a ready to use dry powder. The addition of a controlled amount of clean water produces a free-flowing grout. The grout exhibits exceptional resistance to “washing-out” of the cement phase when placed in stationary or moving water.
Conbextra UW is a blend of Portland cements, graded fillers and chemical additives. The aggregate grading minimises segregation and bleeding whilst assisting flow characteristics.


  • Conbextra UW is a free flow or pumped non-shrink, cementitious grout for use underwater or in tidal zones where “wash out” would be a problem with conventional grouts.
    Recommended applications include:
  •  Stanchion baseplates
  •  Bridge columns
  •  Quay pillars
  •  Concrete piling
  •  Slipways


  •  No risk of significant “wash-out” of cement phase when placed under water
  •  Displaces water effectively
  •  Gaseous expansion system compensates for shrinkage and settlement in the plastic state
  •  High early and ultimate strength
  •  Exceptional resistance to freeze thaw - ensures durability
  •  Chloride free
  •  Prepackaged needing only on-site addition of water