NANO CONCRETE MEGHA BALLARI AND PRACHI BORKAR VI SEM CIVIL
INTRODUCTION <ul><li>Nanotechnology is one of the most active research areas which has wide applications in almost all the...
Why nanotechnology for concrete? <ul><li>Improves the materials’ bulk properties. </li></ul><ul><li>Ability to control or ...
What is nano concrete? <ul><li>A concrete made with portland cement particles that are less than 500nm as a cementing agen...
NANO MATERIALS <ul><li>Carbon Nanotubes. </li></ul><ul><li>Nano-silica. </li></ul><ul><li>Polycarboxylates. </li></ul>
CARBON NANO TUBES <ul><li>Carbon nanotubes are molecular-scale tubes of graphitic carbon with outstanding properties. </l...
SINGLE WALLED CARBON NANO TUBES
MULTI WALLED CARBON NANO TUBES
PROPERTIES <ul><li>CNT are also highly flexible. </li></ul><ul><li>Mechanically, CNT appear to be the strongest material. ...
NANO SILICA <ul><li>Is the first nano product that replaced the micro silica. </li></ul><ul><li>Advancement made by the st...
NANO SILICA
PROPERTIES <ul><li>High compressive strengths concretes ( 15 MPa and 75 MPa at 1 day; 40 MPa and 90 MPa at 28 days and 48...
POLYCARBOXYLATES <ul><li>Polycarboxylates or polymer based concrete admixtures are High Range Water Reducing admixture (HR...
POLYCARBOXYLATES
RESULTS <ul><li>Resistance to compression - 40 to 90MPa in 1 day.Resistance to compression from 70 a 100 MPa (or more) in ...
<ul><li>Meets the norms of environmental protection. </li></ul><ul><li>70% less use of additives as traditional silica, su...
BENEFITS OF NANO CONCRETE <ul><li>Cessation of contamination caused by micro silica solid particles. </li></ul><ul><li>Low...
CONCLUSION <ul><li>Well dispersed nano particles increase the viscosity of the liquid phase, improves the segregation resi...
SCOPE <ul><li>If Portland cement can be formulated with nano-size cement particles, it will open up a large number of oppo...
<ul><li>This will become a reality with nano-cement because nano-carbontubes are much more effective than carbon fibers. T...
REFERENCES <ul><li>[1] Balaguru, P. N. (2005), “Nanotechnology and Concrete: Background, </li></ul><ul><li>Opportunities...
THANK YOU
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Nano concrete ppt3

Published on: Mar 3, 2016
Published in: Technology      Business      
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Transcripts - Nano concrete ppt3

  • 1. NANO CONCRETE MEGHA BALLARI AND PRACHI BORKAR VI SEM CIVIL
  • 2. INTRODUCTION <ul><li>Nanotechnology is one of the most active research areas which has wide applications in almost all the fields. </li></ul><ul><li>As concrete is most usable material in construction industry it’s been required to improve its quality. </li></ul><ul><li>Improving concrete properties by addition of nano particles have shown significant improvement than conventional concrete. </li></ul>
  • 3. Why nanotechnology for concrete? <ul><li>Improves the materials’ bulk properties. </li></ul><ul><li>Ability to control or manipulate materials at the atomic scale. NANOSCALE ATTACK ON ASR (ALKALI SILICATE REACTION) </li></ul><ul><li>To obtain thinner final products and faster setting time. </li></ul><ul><li>Cost effectiveness. </li></ul><ul><li>Lowered levels of environmental contamination. </li></ul>
  • 4. What is nano concrete? <ul><li>A concrete made with portland cement particles that are less than 500nm as a cementing agent. </li></ul><ul><li>Currently cement particle sizes range from a few nano-meters to a maximum of about100 micro meters. </li></ul>
  • 5. NANO MATERIALS <ul><li>Carbon Nanotubes. </li></ul><ul><li>Nano-silica. </li></ul><ul><li>Polycarboxylates. </li></ul>
  • 6. CARBON NANO TUBES <ul><li>Carbon nanotubes are molecular-scale tubes of graphitic carbon with outstanding properties. </li></ul><ul><li>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). </li></ul>
  • 7. SINGLE WALLED CARBON NANO TUBES
  • 8. MULTI WALLED CARBON NANO TUBES
  • 9. PROPERTIES <ul><li>CNT are also highly flexible. </li></ul><ul><li>Mechanically, CNT appear to be the strongest material. </li></ul><ul><li>The smaller diameters. </li></ul><ul><li>Stiffest and strongest fibers. </li></ul>
  • 10. NANO SILICA <ul><li>Is the first nano product that replaced the micro silica. </li></ul><ul><li>Advancement made by the study of concrete at nano scale have proved nano silica much better than silica used in conventional concrete. </li></ul>
  • 11. NANO SILICA
  • 12. PROPERTIES <ul><li>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.) </li></ul><ul><li>High workability with reduced water/cement ratio. </li></ul><ul><li>Use of super plasticizing additives is unnecessary. </li></ul><ul><li>Fills up all the micro pores and micro spaces. </li></ul><ul><li>Cement saving upto 35-45%. </li></ul>
  • 13. POLYCARBOXYLATES <ul><li>Polycarboxylates or polymer based concrete admixtures are High Range Water Reducing admixture (HRWR). </li></ul><ul><li>low dosage-reduce water as much as high dosage of conventional admixtures. </li></ul><ul><li>Higher dosage-produce Self Compacting Concrete (SCC). </li></ul><ul><li>This admixture type is very suitable for underwater anti-washout concrete. </li></ul>
  • 14. POLYCARBOXYLATES
  • 15. RESULTS <ul><li>Resistance to compression - 40 to 90MPa in 1 day.Resistance to compression from 70 a 100 MPa (or more) in 28 days. </li></ul><ul><li>Produces high resistance even with low addition (1 to 1.5 % of the cements weight) and gives self compacting characteristics with higher proportions (2.5 %). </li></ul>
  • 16. <ul><li>Meets the norms of environmental protection. </li></ul><ul><li>70% less use of additives as traditional silica, super plasticizers or traditional fibres. </li></ul>
  • 17. BENEFITS OF NANO CONCRETE <ul><li>Cessation of contamination caused by micro silica solid particles. </li></ul><ul><li>Lower cost per building site. </li></ul><ul><li>Concrete with high initial and final compressive and tensile strengths. </li></ul><ul><li>Concrete with good workability. </li></ul><ul><li>Cessation of super plasticizing utilization. </li></ul><ul><li>Cessation of silicosis risk. </li></ul>
  • 18. CONCLUSION <ul><li>Well dispersed nano particles increase the viscosity of the liquid phase, improves the segregation resistance and workability of the system. </li></ul><ul><li>Accelerates the hydration. </li></ul><ul><li>Better bond between aggregates and cement paste. </li></ul><ul><li>Improves the toughness,shear,tensile strength and flexural strength of concrete. </li></ul>
  • 19. SCOPE <ul><li>If Portland cement can be formulated with nano-size cement particles, it will open up a large number of opportunities. </li></ul><ul><li>The cement will not only be more economical than organic polymers but also will be fire resistant. </li></ul><ul><li>A number of investigations have been carried out for developing smart concrete using carbon fibers. </li></ul>
  • 20. <ul><li>This will become a reality with nano-cement because nano-carbontubes are much more effective than carbon fibers. The thickness of the composite can be reduced to microns and hence flexible and smart cement composite can be manufactured. </li></ul>
  • 21. REFERENCES <ul><li>[1] Balaguru, P. N. (2005), “Nanotechnology and Concrete: Background, </li></ul><ul><li>Opportunities and Challenges.” Proceedings of the International Conference application of Technology in Concrete Design . </li></ul><ul><li>[2] Boresi, Arthur P.; Chong, Ken P.; Saigal, Sunil. Approximate Solution Methods in </li></ul><ul><li>Engineering Mechanics, John Wiley, New York, 2002, 280 pp. </li></ul><ul><li>[3] Balaguru, P.; and Shah, S.P. Fiber Reinforced Cement Composites, McGraw-Hill, </li></ul><ul><li>New York, 1992, 530 pp. </li></ul><ul><li>[4] “Concrete”, Wikipedia, http://en.wikipedia.org/wiki/Concrete. </li></ul><ul><li>[5] Srivastava, D.; Wei, C.; and Cho, K. “Nanomechanics of carbon nanotubes and </li></ul><ul><li>composites.” Applied Mechanics Review, 56, 2003, 215-230. </li></ul><ul><li>[6] LI, G. Properties of high-volume fly ash concrete incorporating nano-SiO2. </li></ul><ul><li>Cement and Concrete Research. 34. 2004. P. 1043 – 1049. </li></ul><ul><li>[7] McCARTHY, M.J. & DHIR, R.K. Development of high volume fly ash cement. </li></ul><ul><li>  </li></ul>
  • 22. THANK YOU

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