Sika® Stabilizer-622 UWC

UNDERWATER/ANTI-WASHOUT ADMIXTURE

Sika® Stabilizer-622 UWC is a powdered underwater/anti-washout admixture formulated to increase the cohesion of concrete to enable significant reductions in washout.

Sika® Stabilizer-622 UWC has the following characteristics and should be used in combination with a Sika® HRWR/ Superplasticiser:
  • Strong increase in cohesion
  • Extended workability
  • Superior anti-washout properties
  • Provides improved integrity of concrete placed underwater
  • Less segregation and bleed
Product Data Sheet Show all documents

Overview

Usage

Sika® Stabilizer-622 UWC allows for the production and the improvement of concrete to be placed underwater. Sika® Stabilizer-622 UWC is mainly used for the following applications:
  • A wide range of applications where concrete is to be placed underwater
  • Marine construction
 

Advantages

Sika® Stabilizer-622 UWC has the following characteristics and should be used in combination with a Sika® HRWR/ Superplasticiser:
  • Strong increase in cohesion
  • Extended workability
  • Superior anti-washout properties
  • Provides improved integrity of concrete placed underwater
  • Less segregation and bleed

Packaging

15 x 1 kg bag

Colour

Broken White Powder

Product Details

Composition

Powder blend of plasticisers and viscosity modifiers

Shelf life

12 months from date of production if stored properly in undamaged unopened, original sealed packaging.

Storage conditions

Store in dry conditions at temperatures between +10 °C and +35 °C. Protect from direct sunlight and frost.

Bulk density

~0.70 ± 0.1 kg/L

Application

Compatibility

Sika® Stabilizer-622 UWC may be combined with many other Sika products.

 

Important:

Always conduct trials before combining products in specific mixes and contact our Technical Service Department for information about specific combinations.

DISPENSING

Sika® Stabilizer-622 UWC should not be added to the gauging water.

Sika® Stabilizer-622 UWC should preferably be added at the batching plant with the aggregate or cement to support dispersion.

A wet mixing time, which is depending on the mixing conditions and mixer performance, of at least 120 seconds is recommended.

Underwater concrete needs to have high workability (F4 consistence) in order to flow and compact.

Underwater/anti-washout admixtures combined with superplasticisers require a long, slower mixing action to achieve a high workability.

When added directly to a truck mixer, the mixer shall rotate its drums at maximum revolutions for at least 1 minute per m3 concrete and a minimum of 5 minutes to achieve a uniform mix.

Consumption

0.5 – 1.5 % by weight of cement (depend on mix design and material).

APPLICATION

The standard rules of good concreting practice, concerning production and placing, are to be followed.

Cement contents should be at least 400 kg/m3 (CEM I) with a maximum water/cement ratio of 0.45.

Typically the fine aggregate content should be >45%.

Laboratory trials shall be carried out before concreting on site, especially when using a new mix design or producing new concrete components.

Underwater concrete can be placed by skip, pump or tremie.

However, care is needed not to allow the concrete to free-fall through a water filled pump line or tremie pipe as the turbulent flow produced will cause the mix to segregate.

Pumping will normally produce the best results and minimise washout as only the top surface is usually exposed to the full effects of the water movement.

 

Documents