Retarders/Set Controllers

Use

• Large volume pours.
• Avoidance of cold joints.
• Construction joints without formwork.
• Long hauls.
• Difficult placing conditions.
• Elevated temperatures.
• Revibrated concrete.

Coverage / Usage Approx: 0.2 -2.0% by weight of cement

Characteristics and Advantages

• Controlled setting time.
• Chloride free- does not attack reinforcement.

Colour

Yellowish

Packaging

25 litre

200 litre

Use

• Used in wet and dry spray shotcrete where cement hydration of the concrete mix is prevented until it is required. It is therefore possible to stabilise mixed concrete for hours or even days i.e. in tunnelling work.

Coverage / Usage Approx: 0.2 -3.0% by weight of cement

Characteristics and Advantages

• Block cement hydration. This is in contrast to other stabilisers or ratarders, which only retard hydration of the cement.
• The effect of SikaTard®-930 may be immediately stopped when Sigunit is used as an accelerator. Thus hydration of the previously stabilised shotcrete, will start immediately.
• SikaTard®-930 does not contain chlorides or any other steel corrosion promoting materials. It can therefore be used in steel reinforced concrete construction without restriction.

Colour

Colourless liquid

Packaging

200 litre

1000 litre