Avista Surface Retarder is ready to use water-based retarder which is used on freshly laid concrete to reveal the aggregate content of the mix. Perfect for horizontal concrete surfaces.
Avista Surface Retarder is a water based retarder for concrete surfaces, which is ready for use on freshly laid concrete to reveal the aggregate content of the mix.
Avista Surface Retarder is used to reveal aggregate in freshly placed horizontal concrete by delaying the surface set so that the mortar paste may be washed from between the aggregate particles, after the mass of the concrete has set. This produces an attractive exposed aggregate finish, or a key for subsequent pours or renders, e.g. floors, driveways, paving, etc.
Avista Surface Retarder is a stable water based solution and the active ingredients will remain in dispersion under sealed conditions. Avista Surface Retarder must not be diluted with any solvent or liquid.
3 - 5m² per litre per coat
| Code | Item | Pack |
|---|---|---|
| 15049 | AVISTA - Wet Concrete Surface Retarder | 20L |
Shake the product prior to use. Do not dilute contents. Apply an even coating via spray unit (garden sprayer or similar) directly onto the exposed upper surface of the concrete as soon as the initial ‘bleeding’ has finished, but before ‘initial set’ has occurred. When the Retarder is sprayed on the concrete, it will turn a blue colour making it easier to see when all the surface has been covered. Treated concrete surfaces must be protected from direct sunlight and wind, which may cause the surface to dry out rapidly. During the treatment process the concrete should also be protected from dirt and rain. Adequate curing procedures are essential.
After 3-24 hours, wash off using a high pressure water spraying unit (minimum of 2000psi) and a stiff broom to remove excess slurry. Care must be taken when using the high pressure unit to ensure the aggregate isn’t removed. The time to remove the concrete paste is dependent on the type of concrete used, temperature, wind, humidity.
Spray equipment should be cleaned immediately after use with hot water.
Approval test - always pre test on a small section to determine the appearance achieved. This is particularly important with finer aggregates such as 6mm and 9mm and with concretes with accelerated set additives such as calcium chloride, heated or steam cured concretes, etc. Proper curing of exposed aggregate surface is essential for maximum strength development. High temperatures will reduce retardation and high cement contents will also reduce retardation. When retardation has finished, concrete will cure to its full strength.
