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INTRODUCTION
• Nanotechnology is one of the most active areas of research, which is widely used in almost all areas.
• The most suitable materials as concrete in the construction industry, it must improve its quality.
• Improvement of properties of concrete by adding nanoparticles showed significant improvement compared to conventional concrete.
Why nanotechnology for concrete?
• Improves 3D svojstvathe material.
• Ability to control or manipulate materials at the atomic level. Nano-scale ATTACK on the ASR (alkali metal silicate reaction)
• To obtain a finer end products and quick setting time.
• Cost Effectiveness.
• Reduced levels of pollution.
What is nano-concrete?
• Concrete made with portlandcementnyh particles that are less than 500 nm cementing agent.
• Currently, cement particle size in the range of a few nanometers up to a maximum of up to 100 micro meters.
Nanomaterials
• Carbon nanotubes.
• Nano-Silicon.
• Polikarboksilaty.
CARBON nanotubes
• Carbon nanotubes are molecular-scale carbon-graphite tubes with outstanding properties.
• They can be a few millimeters in length and can have one "layer" or wall (single nanotubes) or more than one wall (multi-walled nanotubes).
• single-walled CARBON nanotubes
• MULTI walled CARBON nanotubes
PROPERTIES
• CNT is very flexible.
• Mechanically, CNT seem to the most durable material.
• Smaller diameters.
• rigid and strong fibers.
NANO SILICA
• Is the first Nano product that replaced the micro silica.
• Promote the study of concrete made with nano-scale proven Nano silica silica is much better than used in conventional concrete.
PROPERTIES
• Strong high compression strength concrete (15 Mpa and 75 Mpa in 1 day;. 40 MPA 90 Mpa for 28 days and 48 Mpa and 120 Mpa at 120 days)
• High technology with low water/cement ratio.
• The use of Super plasticizers additives are required.
• Fills all the micro pores and micro space.
• saving of cement to 35-45%.
polikarboksilaty
Concrete additives • Polikarboksilaty or polymer based on high Range Water Reducing admixture (HRWR).
• low dosage-reduce water as much as high-dose conventional contaminants.
• Higher doses, produce an independent concrete (SCC).
• This type of mixture is very suitable for underwater anti-washout concrete.
RESULTS
• Resistance to compression-40 to 90MPa in 1 day.Resistance to compression from 70100 Mpa (or more) within 28 days.
• Produces highly resistant even at low addition (from 1 to 1.5% by weight of cement) and gives a seal characteristics with higher stakes (2.5 per cent).
• Complies with environmental protection.
• 70% less use of additives such as silica, traditional super plasticizers or traditional fibres.
BENEFITS OF NANO-CONCRETE
• Stop pollution caused by micro particles of silica.
• Lowest cost construction site.
• Concrete with high initial and final compressive and tensile strength.
• Concrete with good health.
• Ending the use of Super plasticizer.
• Termination of silicosis risk.
CONCLUSION
• Well dispersed nanoparticles increase the viscosity of the liquid phase, improves resistance to segregation and system availability.
• Accelerates the hydration.
• Better communication between the aggregates and cement test.
• improves the impact strength, shear, tensile and bending strength of concrete.
SCOPE
• If the Portland cement can be formulated with Nano-size particles of cement, it would open a lot of opportunities.
• Cement is not only more economical than organic polymers, but also fire resistant.
• A number of studies were conducted to develop the smart concrete with carbon fiber.
• This will become a reality with Nano cement, because the Nano-carbontubes are much more effective than carbon fibres. The thickness of the composite material can be reduced to Micron and therefore flexible and smart composite cement can be made.