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.