about nano concrete including nano silica and other nano cement components

1. Class:TE A
Seminar On
NANO CONCRETE
Submitted By :Satyam Sopori
Under the Guidance of : Prof. Kodam Sir
JSPM’ Imperial College Of Engineeering and Research,
Wagholi, Pune
Department of Civil Engineering

2. Content
 INTRODUCTION
 WHY NANOTECHNOLOGY FOR CONCRETE?
 WHAT IS NANO CONCRETE?
 NANO MATERIALS
 NANO SILICA
 BENEFITS OF NANO CONCRETE
 CONCLUSION
 SCOPE
 REFERENCES

3. 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.

4. 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.

5. 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.

6. NANO MATERIALS
 Carbon Nanotubes.
 Nano-silica.
 Polycarboxylates.

7. 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).

8. SINGLE WALLED CARBON
NANO TUBES

9. MULTI WALLED CARBON NANO
TUBES

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

11. NANO SILICA
 Is the first nano product that replaced the micro
silica.
 Advancement made by the study of concrete at
nano scale have proved nano silica much better
than silica used in conventional concrete.

12. NANO
SILICA

13. 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%.

14. POLYCARBOXYLATES
 Polycarboxylates or polymer based concrete
admixtures are High Range Water Reducing
admixture (HRWR).
 low dosage-reduce water as much as high dosage of
conventional admixtures.
 Higher dosage-produce Self Compacting Concrete
(SCC).
 This admixture type is very suitable for underwater
anti-washout concrete.

15. POLYCARBOXYLATES

16. 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 %).

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

18. 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.

19. 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.

20. SCOPE
 If Portland cement can be formulated with nano-
size cement particles, it will open up a large
number of opportunities.
 The cement will not only be more economical
than organic polymers but also will be fire
resistant.
 A number of investigations have been carried out
for developing smart concrete using carbon
fibers.

21.  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.

22. References
 www.google.com
 www.wikipedia.com
 www.studymafia.org
 www.pptplanet.com
 www.pdfclass.com

23. Thanks