The Different Processes of Spray on Concrete

A method in which the concrete is sprayed in a specific place instead of the pouring and placing method is known as the ‘sprayed concrete’ processes. There are multiple uses and applications for this. This sprayed concrete can be used for structures which are free-formed like climbing walls and swimming pools besides the curved structures like tunnel linings, domes and shell roofs. This is also used for retailing walls, construction in the underground and piled wall facings. Sprayed concrete is also used for the required protection for steel work against fire or for strengthening the existing structures.Wet Process of Sprayed Concrete

This process of sprayed cement is made using a mixture containing aggregates, cement, and water which has a specific weighted volume. This is done much before the process of pumping. Concrete is positioned on the surface by using compressed air that sprays concrete at high velocity. This process affixes the concrete on to the surface.

This sprayed concrete by the wet process is available either by mixing on-site or using the ready made ones. For not so high volumes you can opt for the bags of pre-blended dry mix of concrete. Technique of Spray on Concrete using the Wet Process

The technique for spraying is different depending on the required nature of the work. The initial layer can be of a thickness of around 150 mm and for any additional thickness, additional layer can be put but only after the final layer is dried. Before using this process of sprayed concrete, it is essential to check for any debris in the existing layer of concrete. This works well for decorative purposes besides the structural reasons.Advantages of Wet Process for Sprayed Concrete

Using this application there is elimination of dust particles. Spraying can be done with less demand of air and the result is a high-quality spray on concrete.Dry Process of sprayed Concrete

In the dry process a fixed amount of aggregate is mixed with the cement without using any water. This is fed into a specific designed machine and with the help of an air stream which is of a high velocity the mixture is conveyed to the nozzle from the hose. For the hydration of this mix a clean water spray is provided at the nozzle. This ensures the right content of water for the required consistency.

This process tends to be ideal for overhead construction and limited thickness. If required the admixtures can be added in the dry form to the aggregate and cement content.Technique of Sprayed Concrete using the Dry Process

The nozzle man tends to direct the materials used and keeps a control on the water addition. Those places which are difficult for the nozzle man, automated machines are used.Advantages of the dry Process Sprayed Concrete

You can look forward to an unlimited holding time and a high early strength. The stabilizing and sealing is done in the initial stages itself. overall, no concrete is wasted.Reasons for using Sprayed Concrete

Sprayed concrete ensures the reduction in the frame work, ensuring you can save on time and money. The ratio of cement to water is on the lower side, besides the bonds are stronger and this spray on concrete tends to stick in a firm manner.

For this process of sprayed concrete, it is advisable to solicit the services of contractors who have the required knowledge and experience in both the processes. They can assess the requirement and then decide accordingly. Check out the reputation of the specific contractor before you make a choice.