Product Data Sheet Show all documents

SikaTard®-930

Set Stabilising Admixture

SikaTard®-930 is an admixture developed for the control of cement hydration. SikaTard®-930 stabilises concrete mixes without setting for extended periods and without negatively influencing their quality.

  • SikaTard®-930 blocks cement hydration. This is in contrast to other stabilisers or retarders, which only retard hydration of the cement.
  • The effect of SikaTard®-930 may be immediately stopped when Sika® 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.
Product Data Sheet Show all documents

Usage

SikaTard®-930 is mainly 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.  

Advantages

  • SikaTard®-930 blocks cement hydration. This is in contrast to other stabilisers or retarders, which only retard hydration of the cement.
  • The effect of SikaTard®-930 may be immediately stopped when Sika® 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.

Packaging

1000 L IBC container
 

Colour

Liquid, colourless

Product Details

Sustainability / Certifications / Approvals

APPROVALS / CERTIFICATES

Conforms to the requirements of EN 934 - 5, Table 2.
Product Information

Composition

Polycarboxylic acid compounds.

Shelf life

12 months from date of production if stored in original, undamaged and sealed containers.

Storage conditions

Protected from direct sunlight at temperatures between 1°C and 35°C. Use clean containers when delivered in bulks.

Density

~1.1 kg/L

pH-Value

~3 ± 0.5

 

Application

Consumption

Recommended dosage

SikaTard®-930 is normally used at between 0.2 % to 3 % by weight of cement and added at the batching plant. The following table shows the approximate retarded stabilisation times at various dosages.

SikaTard®-930 dosageStabilization time in hours
0.4%

~8

0.6%

~10

0.8%~15
1.0%~20
1.2%~25
1.4%~30
1.6%~40
1.8%~60
2.0%~75

The table is to be used as guideline only - for specific stabilisation periods, trials with the actual cement are essential.
SikaTard®-930 is added to the mix at the batching plant.

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