What are Retarders?
Retarders are admixtures that cause a decrease in the rate of cement hydration and lengthen the time of setting. Retarders remove the tendency of some cement to exhibit false set and counter the accelerating effect of high temperatures. They improve the workability and the finishability in hot weather and increase the transporting distance of the ready-mixed concrete. Retarders help to reduce the possibility of early dry-shrink cracking and reduce the maximum temperature rise in mass concreting, by extending the heat-dissipation period.
