nano concrete

NANO CONCRETE

Chandana BijuS7 CE

Reg:206185(15)

Under The Guidance of :-

Ms.Sneha.S

104/11/23 Dept of CE/SJCET

CONTENTS• Intoduction• Why Nanotechnology in concrete• What is nanoconcrete?• Carbon nanotubes• Nanosilica• Titanium dioxide• Benefits of Nanoconcrete• Conclusion


INTRODUCTION

• Nanotechnology most active research areas• Used in medical field• Benefits energy sector• Benefits manufacturing sector• Concrete requires improvement-nano particles are

added


• Improves the materials bulk properties• Ability to control or manipulate materials at

the atomic scale• Obtains thinner final products • Cost effectiveness• Lowered levels of environmental

contamination

Why nanotechnology in Concrete?


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 about 100 micro meters


NANO MATERIALS

• Carbon Nanotubes

• Nano-silica

• Titanium dioxide


CARBON NANO TUBES

• Molecular-scale tubes of graphitic carbon

• They can be several millimetres in length.

• They can be:- Single walled. Multi walled.


SINGLE WALLED CARBON NANO TUBES


MULTI WALLED CARBON NANO TUBES


PROPERTIES

• Highly flexible• Strongest material• Smaller diameters• Forms of carbon nanotubes:- Nano-horns Nano test-tubes Nano-fibres


PRODUCTION OF CARBON NANOTUBES

• Electric arc dischargePrinciple-based on the electric arc discharge

generated b/w the 2 graphite electrodes under an inert atm

Cobalt is added to graphite electrodes-produced SWNT


DISADVANTAGES

• Bundles are formed & entangled

• Sliding occurs

• Cost of adding CNT is high


NANO SILICA

• Micro silica causes a disease-silicosis

• First nano product that replaced microsilica

• Made building,roadways,stairs,dams etc longlasting


NANO SILICA


PROPERTIES

• High compressive strength concretes• Good workability• Fills up all the micro pores and micro spaces• Cement saving upto 35-45%• Preserves operators health• Lowered levels of contamination• Preserves cone shape in cone test


PRODUCTION OF NANOSILICA

• Vaporization of silica

• By condensation

• By biological method-from California red worm


TITANIUM DIOXIDE

• White pigment

• It oxidises oxygen or organic materials

• UV light activates its photocatalytic properties-destroys bacteria cell wall & membrane-causes death of bacteria


Conti…• Used as photocatalyst in building materials

esp in Japan & Europe.• Due to photocatalytic action,whiteness of

building remains.

Titanium dioxide


BENEFITS OF NANO CONCRETE

• Cessation of contamination caused by micro silica solid particles

• Lower cost per building site• High compressive strength• Concrete with good workability• Cessation of super plasticizing utilization• Cessation of silicosis risk


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 shear,tensile strength and flexural

strength of concrete.2004/11/23 Dept of CE/SJCET

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 inEngineering 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 andcomposites.” 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.


nano concrete

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