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CEMENT & CONCRETE
Admixture accelerators for cold conditions
C
Chryso XEL C205 chloride formulation facilitates earlier demoulding and faster turnaround times
older 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 dr y precast operations is Chr yso 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 sur face, 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 Chr yso 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 Chr yso 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 Chryso XEL 650 be optimised. non-chloride formulation promotes initial hydration of cements
IMIESA July 2021
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