Admixture accelerators for cold conditions

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Colder ambient temperatures can cause delays in concrete strength development, as well as finishing aspects; however, the challenge is easily overcome using specialised accelerator admixtures. These are normally categorised as chloride and non-chloride based.

A popular chloride-based accelerator commonly used by many dry precast operations is Chryso XEL C205. This product enhances the early stages of cement hydration, which in turn enhances the rapid stiffening and hardening of the concrete mix. The result is that final finishing or mould stripping can begin at an earlier age without damaging the concrete surface, increasing productivity. It can be used in applications that do not contain embedded metal, and in foamed mortar systems.

For steel-reinforced concrete, the ideal solution is the nonchloride-based accelerating admixture Chryso XEL 650. This can be used in all types of cement, and applications that include shuttered concrete, prestressed concrete, precast elements and readymix.

Another solution is Chryso XEL 680 EMx, which is specifically used in highly extended cements. It allows for productivity gains through pouring/stripping cycle time reduction. Moreover, it enables the time required and temperature of steam curing to be optimised.

Chryso XEL C205 chloride formulation facilitates earlier demoulding and faster turnaround times Chryso XEL 650 non-chloride formulation promotes initial hydration of cements