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Carbon nanotubes

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  • 1. NANOTECHNOLOGY IN CONSTRUCTION Guided by, Prof.G. Krishnan sir Presented by Rahna meem Roll no:42
  • 2. CONTENTS
    • INTRODUCTION
    • NANOTECHNOLOGY
    • NANOCONCRETE
    • CONCRETE & NANOTECHNOLOG
    • NANOCEMENT
    • SOL-GEL PROCESS
    • RESULTS
    • CONCIUSIONS
  • 3. INTRODUCTION
    • Deals with production and application of
    • Physical
    • Chemical
    • Biological systems at scales ranging from few nanometers to submicron dimensions.
  • 4.
    • NANOTECHNOLOGY
    • Deals with structures of size 100nm or smaller
    • One nm is 10^-9 of a meter.
    • For comparison
    • typical carbon-carbon bond length are in range 0.12-0.15nm
    • DNA has a diameter around 2nm.
    • bacteria of genus Mycoplasma are around 200nm in length.
  • 5. NANOCONCRETE
    • Defined as the concrete made with Portland cement particles that are less than 500nm as the cementing agent.
    • Currently cement particle size ranges from a few nm to a max of 100000nm.
    • For micro cement avg particle size is reduced to 5000nm.
  • 6. Fig.1: Nanoconcrete http://www.nrc-cnrc.gc.ca/main-e.html
  • 7. Concrete and Nanotechnology
    • concrete utilizes nanotechnology because it contains nano-particles as ingredients including nano-water particles and nano-air voids.
    • to claim the use of nanotechnology, we should be able to control the amount and the locations of these nano- ingredients inside the final products.
    • If we can create chemical or mechanical tools to control nano-scale pores then concrete becomes a product of nanotechnology.
  • 8. Fig. 3: Scale of various Constituents of concrete. http://www.uwm.edu/~sobolev/ACI/2-Balguru-ACI-F.pdf .
  • 9. NANOCEMENT
    • SOL-GEL PROCESS
    • sol-gel method was used to synthesize each component of Portland cement using nano-particles.
    • sol is a combination of monomers of solvent-soluble or water-soluble polymers along with a precipitator. Once formed, the sol can be transformed into a gel under similar controlled conditions for temperature, pressure, etc.
  • 10.
    • EXPERIMENT
    • In this experiment, the hydration rate for each type of tricalcium silicate component are measured.
    • When the tri- or di- calcium silicates react with water a calcium-silicate-hydrate gel is formed.
    • This calcium-silicate hydrate (C-S-H) is the principal hydration product and primary binding phase in Portland cement.
  • 11.
    • 4. component was synthesized by dissolving the solid particles in water and mixing the solution by hand with a metal spatula to form a homogenous sol.
    • heated on a heat plate at 100°C for approximately 30 to 40 minutes .
    • the samples were placed in crucibles and annealed at 1000°C for 30 min
    • Finally, the samples were ground to a fine powder using a mortar grinder then placed in glass tubes and sealed with Para Film for protection from moisture
  • 12. Fig.6:Prepared Nano cement Samples.
  • 13.
    • 15 mL of de-ionized water was placed in a vacuum flask.
    • 1g of cement was added to the water and the flask was covered with a piece of Styrofoam board.
    • The water and cement were mixed by shaking the flask and the temperature as a function of time was recorded using data acquisition software.
    • The sampling rate was set at 10 points/second .
  • 14. Fig.7: Hydration Test Experiment Setup
  • 15.
    • Compression Test
    • Cylindrical specimens were prepared using PVC pipe, 1.25 cm in diameter and 2.5 cm in length.
    • The samples were mixed with water, cast in the PVC pipe molds, and covered with thin glass plates.
    • cured for one day at room temperature and then for 6 days in a moist curing room.
    • Following the 7-day curing period, the samples were removed and allowed to dry.
    • Some specimens fractured during the curing process and therefore, could not be tested.
    • Load and strain data were recorded using data acquisition software.
    • The loading rate was set at 0.3 inches/minute
  • 16. Fig.8:Specimen Prepared for Curing. Fig.9:Fractured Specimen .
  • 17. Fig.10: Specimen Prepared for Testing .
  • 18.
    • RESULTS .
    • . Hydration tests indicated that the nano-cement had a more rapid hydration rate than portland cement.
    • Compressive strength of the cement synthesized using nano-particles was found to be less than that of ordinary portland cement.
  • 19. conclusion
    • It is clear that nanotechnology has changed and will continue to change our vision, expectations and abilities to control the material world.
    • These developments will definitely affect construction materials.
    • Large amounts of funds and efforts are being utilized to develop nanotechnology.
  • 20. REFERENCES
    • Feynman.R “There’s Plenty Of Room” (reprint from speech given at Annual meeting of the West Coast section of the American physical society), Engineering and science , 23, 2008 pp. 22-36.
    • Drexler, K.E. Peterson.C and Pergamit. G , Unbounding the Future, William Morrow , New York 2007.
    • Nanotechnology and concrete: oppertunities
    • http//en.wikpedia.org/wiki/Nanotechnology, Categories; Nanotechnology..
    • “ The Indian concrete journal” 2008.
    • International Journal Of Recent Trends in Engineering Vol 1, no;4.. May 2009.
  • 21. THANK YOU