Expansion Concrete Std

For the best results, the temperature in the work area should be between 10–25 °C. Store the dry mortar and other materials so that they will remain at over 10 °C before use. At temperatures lower than 5 °C, the strength development will cease. If the product is used in temperatures below 5 °C, then winter measures should be implemented. The substrate should be clean and free from dust, a cement skin, grease or other impurities that can prevent adhesion. Smooth and glossy surfaces should be roughened and elutriated, when necessary. Pre-water before the casting begins. There must not be free water in the casting form. Aluminium may not be casted on. Galvanised castings shall be protected by painting in the part to be casted.

The dry powder is mixed with 2.4 litres of water (12 %) per 20 kg bag. The mixing is done in a paddle mixer or a free fall mixer for approx. 3–7 minutes, or with a drill and a whisk. The mortar is mixed into a homogeneous mass. If the product is used with more water than is recommended, it will resultate in a lower strength and a risk of separation and shrinkage. Use the pre mixed mass within approx. 30 minutes.

Fill the form with the pre-mixed mortar. Work in a direction so that no air-pockets are formed. Vibrate sparingly. Mortar that has started to cure may not be mixed with more water and must be discarded.

Protect the newly-cast surfaces immediately from direct sunshine, rain and high wind. Postwatering should always be done for at least three days in dry and warm weather, as well as in the case of strong winds. Use a water hose with a fine spray nozzle. The strength increases with the post-watering of the cured material. Cover the post-watered surface with plastic. The concrete surface must not be exposed to frost before the strength has reached 5 MPa.