Gunite is the most effective process for structural repairing of large scale concrete works which have been damaged due to inferior workmanship, impact damage, ect. Gunite provides a quick fix concreting while providing a impervious layer. It is a mixture of cement and sand in the proportion of 1:3. A cement gun is used to distribute the mixture onto the concrete structure using a pressure of 2-3 kg/cm2. Prior to Gunite the concrete structure surface is to be cleaned and washed. The nozzle of the cement gun is kept at a distance between 75-85cm away from the treated surface. The velocity of the nozzle varies from 120-160 m/s, the reason for this high velocity is so that it compacts the material on placement.
It is noted that Gunite is different to Shotcrete. Gunite is concrete applied with a dry mix process whereby it is water free until the builder applies it. Whereas Shotcrete is a wet mix concrete where the concrete blend is already premixed with water prior to application
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