Supercast Watertight Concrete Powder

Description

Production – Supercast Watertight Concrete is produced using a pre-bagged powder admixture, designed for use in the Readymix Industry with all types of Portland cements and combination materials such as fly ash, PFA, GGBS limestone fines and microsilica. Based on a unique blend of fatty acid salts and hydrophobic materials Supercast Watertight Concrete Powder is supplied as a white chloride-free powder, pre weighed in water soluble bags, for easy dispensing.

Instructions for use

Mix design

Concrete containing Supercast Watertight Concrete Powder is normally supplied as ready-mixed concrete by any QSRMC or BSI registered producer. The concrete must have a minimum cement content of 350 kg/m3, be batched with a maximum water/cement ratio of 0.45 and have a consistency of S2 or greater. However to optimize performance of Supercast Watertight Concrete Powder, it is recommended that a water/cement ratio of 0.40 or lower is utilised. Trials are recommended to ensure the desired performance characteristics are achieved. Once the fresh concrete is mixed, further materials must not be added. The consistency of the concrete can be adjusted using a suitable water-reducing or superplasticising admixture complying with BS EN 934-2: 2009, Tables 3.1 and 3.2, to ensure the maximum water/cement ratio of 0.45 is not exceeded.

Mixing and Placing

Supercast Watertight Concrete Powder is added to the mixer at the correct dose prior to batching the concrete constituents. Where a superplasticiser is required, it is mixed in after the addition of Supercast Watertight Concrete Powder. The resulting concrete should be mixed for a minimum of five minutes to ensure even distribution of Supercast Watertight Concrete Powder throughout the concrete. Concrete containing Supercast Watertight Concrete Powder should be placed in the same way as normal concrete, in accordance with BS 8000-2.1: 1990, BS 8000-2.2: 1990, BS EN 13670: 2009

Curing

In line with good concrete practice: cure all concrete with Concure WB Clear. (75% curing efficiency) BS 7542.