nano tub

1. NANO CONCRETE

2. 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.

3. 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.

4. 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.

5. NANO MATERIALS
• Carbon Nanotubes.
• Nano-silica.
• Polycarboxylates.

6. 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).

7. SINGLE WALLED CARBON NANO TUBES

8. MULTI WALLED CARBON NANO TUBES

9. PROPERTIES
• CNT are also highly flexible.
• Mechanically, CNT appear to be the strongest
material.
• The smaller diameters.
• Stiffest and strongest fibers.

10. NANO SILICA

11. 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%.

12. RESULTS
• Resistance to compression - 40 to 90MPa in 1
day.Resistance to compression from 70 a 100
MPa (or more) in 28 days.
• 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 %).

13. • Meets the norms of environmental protection.
• 70% less use of additives as traditional silica,
super plasticizers or traditional fibres.

14. 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.

15. 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.

16. REFERENCES
[1] Balaguru, P. N. (2005), “Nanotechnology and Concrete: Background,
Opportunities and Challenges.” Proceedings of the International Conference
application of Technology in Concrete Design.
[2] Boresi, Arthur P.; Chong, Ken P.; Saigal, Sunil. Approximate Solution Methods in
Engineering Mechanics, John Wiley, New York, 2002, 280 pp.
[3] Balaguru, P.; and Shah, S.P. Fiber Reinforced Cement Composites, McGraw-Hill,
New York, 1992, 530 pp.
[4] “Concrete”, Wikipedia, http://en.wikipedia.org/wiki/Concrete.
[5] Srivastava, D.; Wei, C.; and Cho, K. “Nanomechanics of carbon nanotubes and
composites.” Applied Mechanics Review, 56, 2003, 215-230.
[6] LI, G. Properties of high-volume fly ash concrete incorporating nano-SiO2.
Cement and Concrete Research. 34. 2004. P. 1043 – 1049.
[7] McCARTHY, M.J. & DHIR, R.K. Development of high volume fly ash cement.