shotcreting and guniting ppt
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The document discusses shotcreting and guniting processes in civil engineering, highlighting the materials, applications, and benefits of shotcrete, which includes greater compressive strength and cost efficiency in construction. It also outlines guniting as a method for repairing damaged concrete with high compressive strength and impermeability. Various applications include homes, tunnels, and recreational areas, emphasizing the advantages of quick construction and the ability to use recycled materials.
shotcreting and guniting ppt
- 1. CIVIL ENGINEERING DEPARTMENT TAE-1 ROS shotcreting and guniting Submitted by: PUNIT SHARNAGAT (B-25) Submitted to: Prof.V.K.GAJGHATE
- 2. SHOTCRETE
- 3. Materials ■ Portland cement, lightweight aggregate, and admixtures ■ The same type of reinforcing is used in shotcrete as in conventional concrete, like rebar, prestressed steel, and wire mesh.
- 4. Properties ■ Hardened properties similar to conventional cast-in- place concrete. ■ Shotcrete normally has a greater compressive strength then cast in place concrete due to lower water to cement ratio.
- 5. Tools and Machines 2 ½ in. spray nozzle 2 in. spray nozzle Wet Mix Dry Mix (Gunite)
- 6. Applications ■ Homes and buildings ■ Tunnels ■ Channels ■ Dams ■ Retaining walls ■ Bridge retrofits ■ Recreation (pools, zoos, skateparks, waterparks)
- 7. Benefits ■ Lowers cost due to quick speed of construction ■ Easier to construct complex forms or shapes ■ Can use recycled materials such as fly ash and rebar in the mix ■ Bonds well with most surfaces ■ No forming needed, therefore lower costs
- 8. GUNITING
- 9. WHAT IS GUNITING? .■ The guniting is the most effective process of repairing concrete work which has been damaged due to inferior work or other reasons. It is also used for providing an impervious layer.
- 10. ■ The gunite is a mixture of cement and sand, the usual proportion being 1:3. A cement gun is used to deposit this mixture on the concrete surface under a pressure of about 20 to 30 N/cm2.
- 11. PROCEDURE OF GUNITING: ■ The cement is mixed with slightly moist sand and then necessary water is added as the mixture comes out from the cement gun. A regulating valve is provided to regulate the quantity of water. ■ The surface to be treated is cleaned and washed.The nozzle of gun is generally kept at a distance of about 750 mm to 850 mm from the surface to be treated and the velocity of nozzle varies from 120 to 160 m/sec.
- 12. ADVANTAGES OF GUNITING: ■ The high compressive strength is obtained. Strength of about 56 to 70 n/mm2 at 28 days is generally obtained. ■ The high impermeability is achieved. ■ The repairs are carried out in any situation in a short time.
- 13. THANKYOU