• The softness that castable refractories have after being mixed with water is called consistency. This consistency is extremely important for the performance of the refractory material. No matter how high the quality of the material is, if it is applied in the wrong consistency during application, the results will be negative.
• During gunning concrete application, the weather conditions and the temperature of the water used must be at nominal values of +5/+25°C. The material must be stored in a dry and moisture-free environment, provided that a maximum of 6 rows of bags are stacked on top of each other.
• Besides the fact that our gunning concretes can be applied with the screed or plastering method, a gunning machine is actually the most ideal choice.
• A gunning machine is required for the gunning method.
• In gunning machines, dry concrete is directly sprayed through a nozzle using water and compressed air.
• In gunning machines with a rotor volume up to 2 liters, min. 10 bar pressure and 7 m³/min flow rate of dry air are required; in machines with higher rotor volume, higher flow rate air is needed. Especially, the compressed air used in gunning machines must be dry. If the air is not dry, the moisture can cause the concrete to set early, leading to blockages in machine nozzles or hoses.
• If the air is not at sufficient pressure and flow rate, it may cause waste (Rebound loss) in gunning concretes.
• The surface of the sprayed concretes is needled before setting and smoothed with the help of a wooden trowel. Wetting with water (water curing) is definitely required during setting. Because during the setting process, heating occurs due to an exothermic reaction in the concretes. To prevent this, concretes are wetted from the water channel of the gunning machine at the moment of setting.
• Preferably, our gunning concretes are left to rest for 48 hours and subjected to a drying (Dry out) process with a heating program at the end of 48 hours.