An anhydrous pellet form of Calcium Chloride (CaCl2). It is the most widely used and most effective of all cement accelerators.
Normally 1 to 3% calcium chloride based on the cement is used. In general calcium chloride is added to cement slurries to shorten the setting time and/or accelerate the hardening process. It can also be used to offset the delay caused by other additives such as dispersants, fluid loss additives and retarders.