conplast sp430 fosroc superplasticizer is a chloride free, highly water soluble superplasticising admixture based on selected sulphonated napthalene polymers. It is supplied as a brown solution which instantly disperses in water and is designed to significantly increase the workability of site mixed concrete and precast concrete without increasing water demand. It also increases concrete durability by increasing ultimate strengths and reducing concrete permeability.

It enables higher slumps to be achieved in construction and reduces labour costs by allowing work to progress more rapidly. It also improves the consistency and quality of the concrete by reducing segregation, bleeding and the presence of air bubbles and gives better pumpability. It can be used in a wide range of applications including road and bridges, tunnels and airport runways.

When used in construction, the normal dosage of Conplast SP430 is 0.7 to 2 litres per 100 kg of cement. It should be added to the mix along with the water required for hydration, normally with a truck mixer. The admixture should be agitated well to ensure full dispersion and complete mixing of the concrete, especially with sand. Site trials should be carried out to optimise dosages.

Conplast sp430 fosroc can be used in a wide variety of mixes and conditions, including high strength, low permeability and high flow concrete. However, for optimum results it is recommended that the concrete is mixed with a sand having a very high fineness. In addition, the concrete should be pre-wetted before adding the admixture to avoid segregation and additional air entrapment.