SikaTard®-440
HYDRATION CONTROLLING ADMIXTURE
SikaTard®-440 is especially effective in transporting concrete for long distances, for slow concrete placements or pumping long distances, but can also be used for typical set retarding applications. The effect of SikaTard®-440 can be negated at any time by the addition of an appropriate set accelerating admixture. SikaTard®-440 is effective in hot weather conditions to offset the accelerating effects of high ambient and concrete temperatures by delaying the cement hydration. Initial set times are delayed, allowing time for proper placement and finishing without cold joints. Hot weather concreting practices as specified in ACI 305 - Guide to Hot Weather Concreting should be followed.
In conventional concrete applications, SikaTard®-440 also provides the following benefits:
▪ Increased flexibility in planning and scheduling concrete pours,
▪ Improved workability and slump retention,
▪ Improved finishing characteristics,
▪ Reduced risk of thermal cracking in mass concrete pours,
▪ Reduced water content, increased ultimate compressive and flexural strengths.
When used in wash water applications SikaTard®-440 reduces the amount of time and water required to wash the drum. Wash water can remain in the drum and be used as water for the next batch of concrete.
SikaTard®-440 does not contain intentionally added chlorides.