CHRYSO Alpha Block C565 accelerates and plasticises dry concrete mixes
Colder winter temperatures can cause delays in concrete strength development and finishing, which can prove challenging for contractors and precast production plants. The problem can be overcome with the use of accelerators, which are categorised as chloride and non-chloride based.
The CHRYSO Xel C205 is a chloride-based accelerator widely used in dry precast operations. Based on calcium chloride, the admixture enhances the early stages of cement hydration which in turn enhances rapid stiffening and hardening of the concrete mix. The result is that final finishing or mould stripping can begin at an earlier stage without damaging the concrete surface, increasing productivity.
In the winter months, the product assists in overcoming delays in concrete finishing caused by cold weather. Supplied as a clear solution, it instantly disperses in water and can be used in applications that do not contain embedded metal and in foamed mortar systems.
CHRYSO Xel C205 is available in drum or bulk supply and is compatible with other CHRYSO admixtures used in the same concrete mix. It can also be used with ordinary Portland cements and cement replacement materials such as pulverised fly ash, ground granulated blast-furnace slag and silica fume.
For steel-reinforced concrete, the ideal solution is said to be the non-chloride-based accelerating admixture CHRYSO Xel 650, which can be used in all types of cement. Applications include shuttered concrete, pre-stressed concrete, precast elements and ready-mix concrete.
The product helps the first reactions of cement hydration, especially at low temperatures, which reduces setting time and improves early compressive strength. Packaging options include 25 l jerry cans, 200 l drums, 1 000 l flow bins and bulk delivery.
CHRYSO Xel 680 EMx is specifically used in highly extended cements and is designed to allow for productivity gains through pouring or stripping cycle time reduction, as well as optimising the time required and temperature of steam curing.
Technical data, on-site assistance and advice can be provided for admixtures and other products for use with fresh and hardened concrete.