Nano concret ppt
- 2. Content • INTRODUCTION • WHY NANOTECHNOLOGY FOR CONCRETE? • WHAT IS NANO CONCRETE? • NANO MATERIALS • NANO SILICA • BENEFITS OF NANO CONCRETE • CONCLUSION
- 3. INTRODUCTION • Nanotechnology is one of the most active research areas which has wide applications in almost all the fields. • As concrete is most usable material in construction industry it’s been required to improve its quality. • Improving concrete properties by addition of nano particles have shown significant improvement than conventional concrete.
- 4. Why nanotechnology for concrete? • Improves the materials’ bulk properties. • Ability to control or manipulate materials at the atomic scale. NANOSCALE ATTACK ON ASR (ALKALI SILICATE REACTION) • To obtain thinner final products and faster setting time. • Cost effectiveness. • Lowered levels of environmental contamination.
- 5. What is nano concrete? • A concrete made with portland cement particles that are less than 500nm as a cementing agent. • Currently cement particle sizes range from a few nano- meters to a maximum of about100 micro meters.
- 6. NANO MATERIALS • Carbon Nanotubes. • Nano-silica. • Polycarboxylates.
- 7. CARBON NANO TUBES • Carbon nanotubes are molecular-scale tubes of graphitic carbon with outstanding properties. • They can be several millimetres in length and can have one “layer” or wall (single walled nanotube) or more than one wall (multi walled nanotube).
- 8. SINGLE WALLED CARBON NANO TUBES
- 9. MULTI WALLED CARBON NANO TUBES
- 10. PROPERTIES • High compressive strengths concretes ( 15 MPa and 75 MPa at 1 day; 40 MPa and 90 MPa at 28 days and 48 MPa and 120 MPa at 120 days.) • High workability with reduced water/cement ratio. • Use of super plasticizing additives is unnecessary. • Fills up all the micro pores and micro spaces. • Cement saving upto 35-45%.
- 11. BENEFITS OF NANO CONCRETE • Cessation of contamination caused by micro silica solid particles. • Lower cost per building site. • Concrete with high initial and final compressive and tensile strengths. • Concrete with good workability. • Cessation of super plasticizing utilization. • Cessation of silicosis risk.
- 12. CONCLUSION • Well dispersed nano particles increase the viscosity of the liquid phase, improves the segregation resistance and workability of the system. • Accelerates the hydration. • Better bond between aggregates and cement paste. • Improves the toughness,shear,tensile strength and flexural strength of concrete.
- 13. References • www.nanotechnology.com • www.concrete technology.com • www.google.com • www.Wikipedia nanotechnology.com
- 14. THANK YOU......
Editor's Notes
- #2: 1