Carbon nanotubes


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Carbon nanotubes

  1. 1. NANOTECHNOLOGY IN CONSTRUCTION Guided by, Prof.G. Krishnan sir Presented by Rahna meem Roll no:42
  2. 2. CONTENTS <ul><li>INTRODUCTION </li></ul><ul><li>NANOTECHNOLOGY </li></ul><ul><li>NANOCONCRETE </li></ul><ul><li>CONCRETE & NANOTECHNOLOG </li></ul><ul><li>NANOCEMENT </li></ul><ul><li>SOL-GEL PROCESS </li></ul><ul><li>RESULTS </li></ul><ul><li>CONCIUSIONS </li></ul>
  3. 3. INTRODUCTION <ul><li>Deals with production and application of </li></ul><ul><li>Physical </li></ul><ul><li>Chemical </li></ul><ul><li>Biological systems at scales ranging from few nanometers to submicron dimensions. </li></ul>
  4. 4. <ul><li>NANOTECHNOLOGY </li></ul><ul><li>Deals with structures of size 100nm or smaller </li></ul><ul><li>One nm is 10^-9 of a meter. </li></ul><ul><li>For comparison </li></ul><ul><li>typical carbon-carbon bond length are in range 0.12-0.15nm </li></ul><ul><li>DNA has a diameter around 2nm. </li></ul><ul><li>bacteria of genus Mycoplasma are around 200nm in length. </li></ul>
  5. 5. NANOCONCRETE <ul><li>Defined as the concrete made with Portland cement particles that are less than 500nm as the cementing agent. </li></ul><ul><li>Currently cement particle size ranges from a few nm to a max of 100000nm. </li></ul><ul><li>For micro cement avg particle size is reduced to 5000nm. </li></ul>
  6. 6. Fig.1: Nanoconcrete
  7. 7. Concrete and Nanotechnology <ul><li>concrete utilizes nanotechnology because it contains nano-particles as ingredients including nano-water particles and nano-air voids. </li></ul><ul><li>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. </li></ul><ul><li>If we can create chemical or mechanical tools to control nano-scale pores then concrete becomes a product of nanotechnology. </li></ul>
  8. 8. Fig. 3: Scale of various Constituents of concrete. .
  9. 9. NANOCEMENT <ul><li>SOL-GEL PROCESS </li></ul><ul><li>sol-gel method was used to synthesize each component of Portland cement using nano-particles. </li></ul><ul><li>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. </li></ul>
  10. 10. <ul><li>EXPERIMENT </li></ul><ul><li>In this experiment, the hydration rate for each type of tricalcium silicate component are measured. </li></ul><ul><li>When the tri- or di- calcium silicates react with water a calcium-silicate-hydrate gel is formed. </li></ul><ul><li>This calcium-silicate hydrate (C-S-H) is the principal hydration product and primary binding phase in Portland cement. </li></ul>
  11. 11. <ul><li>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. </li></ul><ul><li>heated on a heat plate at 100°C for approximately 30 to 40 minutes . </li></ul><ul><li>the samples were placed in crucibles and annealed at 1000°C for 30 min </li></ul><ul><li>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 </li></ul>
  12. 12. Fig.6:Prepared Nano cement Samples.
  13. 13. <ul><li>15 mL of de-ionized water was placed in a vacuum flask. </li></ul><ul><li>1g of cement was added to the water and the flask was covered with a piece of Styrofoam board. </li></ul><ul><li>The water and cement were mixed by shaking the flask and the temperature as a function of time was recorded using data acquisition software. </li></ul><ul><li>The sampling rate was set at 10 points/second . </li></ul>
  14. 14. Fig.7: Hydration Test Experiment Setup
  15. 15. <ul><li>Compression Test </li></ul><ul><li>Cylindrical specimens were prepared using PVC pipe, 1.25 cm in diameter and 2.5 cm in length. </li></ul><ul><li>The samples were mixed with water, cast in the PVC pipe molds, and covered with thin glass plates. </li></ul><ul><li>cured for one day at room temperature and then for 6 days in a moist curing room. </li></ul><ul><li>Following the 7-day curing period, the samples were removed and allowed to dry. </li></ul><ul><li>Some specimens fractured during the curing process and therefore, could not be tested. </li></ul><ul><li>Load and strain data were recorded using data acquisition software. </li></ul><ul><li>The loading rate was set at 0.3 inches/minute </li></ul>
  16. 16. Fig.8:Specimen Prepared for Curing. Fig.9:Fractured Specimen .
  17. 17. Fig.10: Specimen Prepared for Testing .
  18. 18. <ul><li>RESULTS . </li></ul><ul><li>. Hydration tests indicated that the nano-cement had a more rapid hydration rate than portland cement. </li></ul><ul><li>Compressive strength of the cement synthesized using nano-particles was found to be less than that of ordinary portland cement. </li></ul>
  19. 19. conclusion <ul><li>It is clear that nanotechnology has changed and will continue to change our vision, expectations and abilities to control the material world. </li></ul><ul><li>These developments will definitely affect construction materials. </li></ul><ul><li>Large amounts of funds and efforts are being utilized to develop nanotechnology. </li></ul>
  20. 20. REFERENCES <ul><li>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. </li></ul><ul><li>Drexler, K.E. Peterson.C and Pergamit. G , Unbounding the Future, William Morrow , New York 2007. </li></ul><ul><li>Nanotechnology and concrete: oppertunities </li></ul><ul><li>http//, Categories; Nanotechnology.. </li></ul><ul><li>“ The Indian concrete journal” 2008. </li></ul><ul><li>International Journal Of Recent Trends in Engineering Vol 1, no;4.. May 2009. </li></ul>
  21. 21. THANK YOU