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UW Grout

Underwater cementitious grout

UW Grout is a specialized, underwater, cement-based, non-shrink grout with an integral corrosion inhibitor, designed for underwater repair applications such as pile restoration. This grout is tailored for use in tidal zones and can be applied in thicknesses ranging from 1/2 inch to several inches. It is formulated to resist wash-out and is suitable for use in saltwater environments.

  • Wash-out Resistant: Specially formulated for minimal wash-out, making it ideal for underwater applications.
  • Versatile: Can be used in both freshwater and saltwater environments.
  • Non-Shrink: Ensures durability and stability by maintaining volume over time.
  • High Early and Ultimate Strength: Provides robust structural support quickly, enhancing turnaround times.
  • Corrosion Inhibitor: Protects the integrity of metal components within the grout application area.
Tech Sheet
Safety Sheet
Spanish Tech Sheet

Application

UW Grout is recommended for:

  • Grouting of bridge columns, concrete pilings, and dam repairs.
  • Applications where a resistant, free-flowing, or pumpable non-shrink grout is required, especially in underwater settings.

Preparation and Application

  • Surface Preparation: The substrate must be clean and sound, with all loose material removed. Use sandblasting or high-pressure water jetting for surfaces permanently immersed in water.
  • Mixing: Use 7 to 7.5 pints of water per 50 lb bag to achieve a flowable consistency. Mix with a mechanically powered grout mixer and ensure continuous operation to prevent setting delays.
  • Placing: UW Grout can be dry-packed, poured, or pumped. Utilize a flexible tube for placement to ensure even distribution and to minimize water entrapment.

Curing and Limitations

  • No curing is required for applications submerged in water.
  • For above-water applications, cover with wet rags immediately after setting, followed by an ASTM C309-91 compliant curing compound.

Packaging

  • Available in 50 lb bags and 3000 lb super stacks.

Shelf Life

  • Store in a cool, dry place away from moisture. Properly stored, UW Grout has a shelf life of one year.

Test Data

  • Set Times at 70°F (ASTM C266):
    • Initial Set: 100 minutes
    • Final Set: 240 minutes
  • Compressive Strength (ASTM C109):
    • 1 day: 2500 psi
    • 7 days: 8050 psi
    • 28 days: 9100 psi
  • Expansion % (ASTM C1090):
    • Consistently 0.03% across 1, 7, and 28 days.

Standards

  • Complies with the Corps of Engineers CRD C621 for plastic and flowable conditions, and ASTM C1107.