Sprayed Concrete

What sprayed concrete construction solutions are there available?

Sprayed concrete is a construction technique of projecting concrete or mortar through a hose at high velocity using pneumatic air pressure onto a required surface. It can typically be reinforced by the use of embedded steel bars, mesh, or fibres.

The process is carried out either by using either the dry or wet mix methods. These versatile techniques can offer efficient large area concrete repair solutions. In many cases saving projects time and money by avoiding the use of formwork.

What is the difference between the wet and dry method?

Dry mix (gunite) involves the placing of dry bagged cement mortar into a mixing hopper. The mixture is then conveyed under pneumatic air pressure through a hose to a nozzle end. The mixture of cement mortar and water is completed as the mixture hits the receiving surface. The specialist nozzleman controls the addition of water at the nozzle end during the spray process.

This process is particularly useful in overhead, vertical or formed repair applications where it is necessary to frequently stop or move locations. It allows the nozzleman to instantly control the spray process at all times.

Wet mix (shotcrete) involves pumping pre-mixed prepared concrete (typically ready mixed concrete) through a hose to a nozzle. Compressed air is used to impel the mixture to the receiving surface. This process is particularly useful where large volume pours are required.

What is Sprayed Concrete used for?

Sprayed concrete is commonly used to line tunnel or basement walls, mines, subways sea defences, harbour walls, swimming pool shells, and various ground stabilisation solutions.

Sprayed concrete is a highly challenging technique that should only be undertaken by suitable skilled and experienced operatives. Here at Churchill Concrete Technology, we have the knowledge and expertise to offer a range of sprayed concrete construction solutions.

Please feel free to contact us for no-obligation advice for any requirements you have.