Correct option is D
Gunite is a construction method in which mortar or concrete is conveyed through a hose and pneumatically projected at high velocity onto a surface. This method is commonly used for applications such as repairing concrete structures, creating swimming pools, and constructing curved or irregular surfaces.
1. Ferrocement:
Refers to thin sections of concrete reinforced with wire mesh. It is unrelated to the high-velocity projection of mortar.
2. Varnishing:
Involves applying a protective or decorative coating, unrelated to concrete or mortar application.
3. Concreting:
A general term for laying and setting concrete, not specific to high-velocity projection.
4. Gunite:
This method uses pneumatic projection of mortar or concrete onto a surface at high speed for effective application.
