SikaTard®-930
SikaTard®-930 is an admixture for the control of cement hydration. SikaTard®-930 allows stabilization of concrete mixes for long periods without negatively influencing the 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.
Usage
- Wet and dry shotcrete applications
- Ready-mix applications
- Wherever the controlled set times are required
- Where the prevention of cement hydration in concrete is required
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
205 L (54 US gal.) drum
1040 L (275 US gal.) IBC
Bulk delivery
Colour
Liquid / blue
Product Details
APPROVALS / CERTIFICATES
Meets the requirements of ASTM C494 Type B.
Shelf Life
1 year when stored in dry warehouse conditions at temperatures between 10 °C and 27 °C (50 °F and 80 °F).
Storage Conditions
Protect from direct sun and frost. Store at temperatures above 5 °C (40 °F). If frozen, thaw and agitate thoroughly to return to normal state.
Specific Gravity
Approx. 1.1
Application
Mixing
Mixing
For best results, add SikaTard®-930 to the mix together with the mixing water. During the wet process shotcreting Sika® Sigunit® accelerator is added at the spray nozzle to initiate fast setting. Preliminary trials on site should be conducted to determine the required dosage rates.To optimize the stabilizing effect, after the addition of SikaTard®-930, Sika recommends that the combined materials be mixed for 80-100 revolutions, either in the concrete mixer or in the ready-mix truck.
Combination with other admixtures:
SikaTard®-930 can be used in conjunction with all Sika® Sigunit® accelerators. It is also highly effective as single admixture.
Recommended Dosage
Sika recommends dosage at 250-2000 mL/100 kg of cementitious materials depending on the retardation time. However, dosage rates will vary according to materials used, ambient conditions and the requirements of a specific project.
Note that dosage rates outside the recommended range may be used where specialized materials such as microsilica are specified, extreme ambient conditions are encountered or unusual project conditions require special consideration. In such cases, contact your Sika Canada Technical Sales Representative for further information.
