Product Data Sheet Safety Data Sheet Show all documents

SikaGrout® UW NZ

Cementitious grout for underwater applications

SikaGrout® UW NZ is a cementitious grout formulated to ensure exceptional resistance to ‘washing-out’ of the cement phase when placed in stationary or moving water. It contains materials that provide positive expansion in the plastic phase. SikaGrout® UW NZ is a one component grout and only requires the addition of clean, fresh water.

  • No risk of significant ‘wash-out’ of cement phase when placed underwater
  • Displaces water effectively
  • Positive shrinkage compensation
  • High early age strength development
  • High final strengths
  • High flow characteristics
Product Data Sheet Safety Data Sheet Show all documents

Usage

SikaGrout® UW NZ is used in free flow or pumped grouting application underwater or in tidal zones. Applications include bridge columns, wharf piles, concrete piling, slipways and dams. Use for gaps 6 mm to 80 mm in above ground applications, and for gaps up to 180 mm in underwater applications.  

Advantages

  • No risk of significant ‘wash-out’ of cement phase when placed underwater
  • Displaces water effectively
  • Positive shrinkage compensation
  • High early age strength development
  • High final strengths
  • High flow characteristics

Packaging

25 kg bags

Colour

Grey powder

Product Details

Product Information

Shelf Life

Six (6) months from date of manufacture when stored as stated.

Storage Conditions

Store in unopened, original containers free from frost and below +25°C.

Density

~ 2,050 kg/m³
Technical Information

Compressive Strength

24 hours

~ 20 MPa

7 days

~ 45 MPa

28 days

~ 50 MPa

 

Application

Application Information

Mixing Ratio

Maximum water content: 5.5 litres/25 kg bag
Consumption

Yield

As a pourable grout (approx): 25 kg = 14.5 litres when mixed with 5.5 litres of water
Application steps

MIXING

Application temp: +5ºC – +25ºC. Pour the required amount of clean, fresh water into a suitable mixing container and slowly add all of the powder while mixing continuously with a Sika mixing paddle attached to a low speed electric drill (max. 500 rpm). Mix for 2-3 minutes until a smooth, lump free consistency is achieved.

APPLICATION

  • Grout should be placed into forms immediately after mixing, taking care to ensure no air is trapped.
  • When grout is being placed underwater ensure that the end of the hose or tremie is kept within the grout being placed. The hose or tremie can be raised during pouring to reduce any back pressure but should not be raised above the level of the grout.

CURING TREATMENT

Formwork should be left in place for at least 5 days if possible, to prevent moisture evaporation and provide restraint to early age hardened expansion. In above ground applications, once formwork is removed the use of a suitable curing membrane such as Sika Antisol® should be applied to any exposed faces. Refer to separate data sheet for further information.

CLEANING OF TOOLS

Clean all tools and equipment with water immediately after use. Hardened SikaGrout® UW NZ can only be removed mechanically.

Documents