Use of nanotechnology in concrete


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use of nano technology in concrete

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Use of nanotechnology in concrete

  1. 1. USE OF NANOTECHNOLOGY IN CONCRETE Place Your Subtitle Here
  2. 2. Introduction • Nanotechnology is not exactly a new technology. • Nanotechnology offers the possibility of great advances in construction. • As concrete is most usable material in construction industry it’s been required to improve its quality.
  3. 3. What is Nanotechnology ?? Nanotechnology is the understanding, control, and restructuring of matter on the order of nanometers (i.e., less than 100 nm) to create materials with fundamentally new properties and functions.
  4. 4. Two terms in nanotechnology • Nano science • Nano engineering
  5. 5. Two approaches • Top down approach (decomposition) • Bottom top approach.
  6. 6. NANOTECHNOLOGY and CONCRETE • Concrete is a nanostructured, multi-phase, composite material. • It composed of an amorphous phase, nanometer to micrometer size crystals, and bound water. • The amorphous phase calcium–silicate–hydrate (C–S–H) is the ‘‘glue” that holds concrete together which is nanosized
  7. 7. Why nanotechnology for concrete? • Improves the materials’ bulk properties. • Ability to control nanoscale attack on ASR (ALKALI SILICATE REACTION) • To obtain thinner final products and faster setting time. • Lowered levels of environmental attack
  8. 8. Techniques for analysis of concrete at nanoscale • AFM (Atomic Force Microscopy) • SEM (Scanning Electron Microscopy) • FIB (Focused Ion Beam)
  9. 9. AFM (Atomic Force Microscopy) • very high-resolution type of scanning probe microscopy.
  10. 10. Nano-engineering or nanomodification of cement CEMENT ADDITIVES • Novel superplasticizers • Nanoparticles • Nanoreinforcement
  11. 11. ADDITION OF NANOSIZED AND NANO STRUCTURED MATERIALS IN CONCRETE • • • • • • nano-silica (nano-SiO2) nano-titanium oxide (nano-TiO2) nano-iron (nano-Fe2O3) nano-alumina (nano-Al2O3) nanoclay particles nanotubes/nanofibers (CNTs/CNFs) nano-SiO2
  12. 12. Use of Nanoreinforcements CNTs • Nanotubes(CNTs) CNFs • Nanofibers(CNFs)
  13. 13. Main issues • • • High cost Environmental effects Health effects. • Lack of vision to identify those aspects that could be changed through its use. • Lack of skilled personnel. • Level of investment.
  14. 14. Conclusion • Active research area. • addition of nano particles have shown significant improvement than conventional concrete • current challenges need to be solved before the full potential of nanotechnology can be realized in concrete applications