In construction, strengthening surfaces by waterproofing, weatherproofing, or withstanding mechanical stress is one of the significant tasks. Among the engineering methods applicable to this purpose there is that of cement guniting, or shotcreting.
A procedure that involves the sprayed cement mixture consisting of cement, sand, and water to a high pressure is called cement guniting. The surface may be concrete, brick, stone or even steel structures. It is sprayed using a specialized nozzle and pressurized air. The mixture is very fast and therefore it sticks well to the surface forming a thick, hard and durable coating. It resembles plastering except that rather than manually applying the mix using a trowel it is mechanically sprayed at a much faster rate. This tightens the bond and the layer further compacts.
Dry Mix Process: Only dry cement and sand are combined and supplied into the machine using this procedure. Before spraying, water is put at the nozzle. This method is useful where thickness control is needed and in places with long hose requirements.
Wet Mix Process: In this method, cement, sand, and water are mixed beforehand and then pumped to the nozzle for spraying. It gives better dust control and is suitable for large areas.
To ensure quality and durability, certain specifications are followed in guniting:
Cement guniting is a modern technique in construction to repair, strengthen and shield structures. A pressure spray of cement-sand mix forms a thick and strong coating that sticks well to the surface. Its primary applications are in repair of old buildings, waterproofing, slope protection and reinforcement of concrete members. It needs special machinery and skilled labour, but it is so durable, strong, and versatile that it is among the most stable methods in modern building.
