How can I do Guniting?

The Procedure of Guniting: The dry ingredients are mixed in a bin and stored in a cement gun as shown in the figure above and the dry mix is injected and the water is introduced at the nozzle just before the mix blast off during the time of application under the action of pressure and high velocity.

What is Guniting and grouting?

Gunite is a mixture of Portland cement, sand & water, shot in to the place by compressed air. Guniting is basically used in swimming pool, dams,tanks etc.

What do you understand by Guniting?

Gunite refers to an artificial mixture of cement, water and sand that is applied to a mold to produce a dense hard protective layer. Gunite is used to line tunnels and structures and for construction applications, such as sealing cracks, fissures and areas that could be sources of leaks and/or structural instability.

Can shotcrete get wet?

Shotcrete needs to be protected from rain until it obtains its final set, usually 4 or 5 hours. Following final set, it should be wet cured for at least 4 days, preferably 7 days if possible. The exposure to rain would prove beneficial as the rain would assure the presence of moisture for continued curing.

Where is Guniting used?

Guniting is a process used in construction for the application of slope stabilization and certain rehabilitation purpose mainly in the construction of retaining walls, swimming pool construction, tunnel construction, in fluid tank construction and some of the concrete repair works.

What is the cement ratio used in Guniting method of DPC?

ratio 1:3
Guniting is the method of damp proofing in which a layer of rich cement mortar is deposited on the exposed surface of walls and pipes utilizing pressure. Usually, cement sand mortar in the ratio 1:3 is used for this purpose.

Is Guniting a code?

This standard covers only the guidelines for guniting upstream face of masonry dams to give necessary guidance in this respect. This standard covers the general guidelines to be Water used for gunning should conform to the followed for guniting upstream face of masonry requirements specified in IS 456 : 1978.

Is gunite the same as concrete?

You could refer to gunite as concrete’s cousin because they are both in the same family, but have their differences. Gunite is the dry mixed form of sprayed concrete. Gunite typically only contains fine particles in its mix while concrete contains both large and small particles.

How long does shotcrete take to dry?

Concrete, when applied using the shotcrete process, or cast-in-place, needs to cure for 7 days. Water is the best curing method (7 continuous days).

Why is Guniting done?

What is the purpose of DPC and DPM?

Damp Proof Course (DPC) and Damp Proof Membranes (DPM) DPC and DPM are most commonly applied at below floor level which restricts the movement of moisture through walls and floors. This safeguards concrete from gaining any moisture and helps prevent cracks.

What is guniting and how does it work?

This method makes use of a spray gun and hence the process was named as Guniting. Later, in the time of 1930s a method of spraying concrete or mortar mix with the help of a nozzle spray under compressed pressure and high velocity was followed by the American Railway Engineers Association (AREA).

When to use guniting over wet mix shotcrete?

Guniting is a best choice in those work types were unexpected stoppage of work is possible. The use of wet-mix shotcrete process will be not useful in such situations, resulting in wastage of mix. 1.

What type of mix is used in guniting?

The mix used in guniting is cement mortar mix. There may be variations based on the application and requirements of the area. The figure-1 below shows a typical arrangement of a guniting or dry-mix shotcrete system. As shown in the figure above, the dry ingredients are mixed in a bin and stored in a cement gun.

What is the ratio of cement for guniting?

The mix proportion used for guniting are 1:3 and 1:4:5. This will generally have a water cement ratio of 0.30. A 1:3 mix will attain a strength of 70MPa in the 7 th day after application. 6. The size of fine aggregate used in the mix is 10mm.