UW Grout - Underwater Cementitious Grout

UW Grout is a pumpable underwater cement-based non-shrink grout for use in underwater repair such as pile restoration. 

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UW Grout is designed for underwater use in tidal zones in applications requiring a non-shrink, non-metallic, wash-out resistant grout in thicknesses from 1/2” up to several inches. 

UW Grout is specially formulated for minimal wash-out and is salt-water resistant.

Features & Benefits

• Positive expansion for maximum durability and adhesion

• Free-flowing or pumpable consistency for easy application

• High early and ultimate strength for fast repair and turn around without chlorides

• “Wash-out” resistant thixotropic consistency for dependable underwater repairs (displaces water)

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.