Gunite is one of the popular methods undertaken to repair cracks and other damages in concrete members. Guniting is the process of injecting mortar with low water-cement ratio at a high pressure through a nozzle. This method has been improvised in that only concrete with small-sized coarse aggregate instead of mortar is used. This method is called shortcrete.
In both the methods, the affected concrete part should be cleaned before the operation and gunite or shortcrete is applied. Former small thickness or width of gap gunite is used whereas shortcrete is recommended for larger thickness. The materials used for gunite are cement, sand and water and for shortcrete are cement, sand and small aggregate and water. For quick setting of gunite, accelerators are also added.
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