What is shotcrete PPT?
conventional concrete is first placed and then compacted in the second operation. shotcrete undergoes placement and compaction at the same time. Shotcrete is more dense, homogeneous, strong, and waterproof . It can be impacted onto any type or shape of surface, including vertical or overhead areas.
What is shotcrete method?
Shotcrete is a method of applying concrete projected at high velocity primarily on to a vertical or overhead surface. The impact created by the application consolidates the concrete.
What is shotcrete PDF?
Shotcrete is a term used for concrete and mortar conveyed through a hose pipe and sprayed at. high velocity on to a surface. The unit weight of shotcrete is usually between 2230 to 2390. kg/m, about the same as conventional concrete. Shotcrete undergoes placement and compaction.
What are the types of process in shotcrete?
The two types of shotcrete processes, dry shotcrete (also known as gunite), and wet shotcrete, have grown steadily in popularity in both concrete repair and new construction.
What is spray concrete?
Sprayed concrete is the method by which concrete is sprayed into place, rather than the more conventionally used pouring or placing into formwork. According to the Sprayed Concrete Association other terms used include Gunite, Shot Concrete and Shotcrete. There are many applications and uses for sprayed concrete.
What are the applications of shotcrete?
Applications of Shotcrete
- Reapirs. It can be used to repair the damaged surface of concrete, timber, or steel structures provided there is access to the surface needing repair.
- Bridges.
- Buildings.
- Marine Structure.
- Spillway Surfaces.
- Underground Excavation.
- Slope and Surface Protection.
- New Structures.
What material is used in shotcrete?
shotcrete, also called (trademark) Gunite, concrete applied by spraying. Shotcrete is a mixture of aggregate and portland cement, conveyed by compressed air to the nozzle of a spray gun, where water is added. The wet mixture is then sprayed in place and may be carved or troweled almost immediately.
What is Guniting process?
Guniting is a process used in construction for slope stabilization and various other rehabilitation purposes in the construction of retaining walls, water retaining structures and concrete repair works.
What are the advantages and disadvantages of shotcrete?
Advantages and Disadvantages of Shotcrete
- It can reduce manpower.
- Minimal formwork only required.
- Economically good compared to the conventional concrete.
- We can easily control the water-cement ratio.
- Cost friendly for the repair and rehabilitation work.
What type of concrete is used for shotcrete?
7.2. Shotcrete typically consists of one part cement and four parts sand by weight with approximately 7% water by mass of dry ingredients. It can also include coarse aggregate and admixtures. Dry mix shotcrete involves the premixing of dry ingredients with water added at the nozzle.
What are the properties of shotcrete?
Properly applied shotcrete is a structurally sound and durable construction material which exhibits excellent bonding characteristics to existing concrete, rock, steel, and many other materials. It can have high strength, low absorption, good resistance to weathering, and resistance to some forms of chemical attack.
What is shotcreting technology?
This paper presents an overview of shotcreting technology along with its applications. Shotcrete is a mortar or high performance concrete conveyed through a hose and pneumatically projected at high velocity onto a backing surface.
What are the advantages of shotcrete?
• This innovative technology of shotcrete was introduced to make the work easier and immediate. • Shortcreting has proved to be the best method for construction of curved surfaces. • Domes are now much easier to construct with the advent of with this shotcrete technology. • Tunnel linings are also becoming easy technology.
What are the materials used in shotcrete?
MATERIALS Portland cement, lightweight aggregate, and admixtures O The same type of reinforcing is used in shotcrete as in O conventional concrete, like rebar, prestressed steel, and wire mesh.
What is the wet process of shotcrete?
Wet process: Step1: All ingredients, including water, are thoroughly mixed and introduced into the shotcrete equipment. Step 2: Wet material is pumped to the nozzle where compressed air is introduced Step 3: Mostly wet-process shotcreting is done with premixed mortar or small aggregate concrete. 12.