Spraying Concrete To Repair Walls

Fixing crumbling concrete foundation before spray painting exterior of the house.

Spraying concrete to repair walls.

Shotcrete gunite ˈ ɡ ʌ n aɪ t or sprayed concrete is concrete or mortar conveyed through a hose and pneumatically projected at high velocity onto a surface as a construction technique first used in 1914. Because no chemical bond is created when new concrete is poured against old concrete cold joints such as when you put an addition on your home will often leak water. After the addition has been able to settle for a period of 1 2 yrs the proper repair to stop water coming through a cold joint would be a urethane injection. There are essentially two methods of application.

How to fix concrete near foundation. Wall spray is a concrete wall spray overlay that is a cement based overlay designed for both interior and exterior vertical surfaces. Spalling is most common in older buildings. Repair materials should have an expansion coefficient similar to that of the original concrete.

Spalling is a condition wherein your concrete walls begin to crack and chip off sometimes in chunks and at other times in line bits. Any joints that are repaired must allow for the expansion of the concrete slab. Usually they are sprayed evenly onto concrete with an air powered hopper gun but they can also be applied as a splatter coat to create a textured slip resistant surface or knocked down with a trowel to create a smoother finish. The air temperature must be over 40 f for patching or other restoration work to ensure proper bonding and curing of the repair material.

7 it is typically reinforced by conventional steel rods steel mesh or fibers. It offers a wide variety of finishes from a simple knock down to a sophisticated faux venetian plaster. Walls of any shape or size can be built with sprayed concrete techniques. But the cracks are definitely going to be there.

In the united states it is sold as the tridipanel system. Sprayed concrete is also commonly used to provide fire protection to steelwork and for strengthening and repair works to existing structures. Versatile and easy to apply spray down concrete systems offer a wide array of finish options. Shotcrete is usually an all inclusive term for both the wet mix and dry mix versions.

The methods discussed in this article can be used to repair minor non structural cracks. Concrete spalling repair methods. One wall system that makes it easy to build walls with low velocity spraying techniques was invented by evg in austria in the early 1970s.