05012013133324-nano-concrete.ppt

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NANO CONCRETE



INTRODUCTION

• Nanotechnology is one of the mostactive research areas which has wideapplications in almost all the elds

• As concrete is most !sa"le material inconstr!ction ind!stry it#s "een re$!iredto improve its $!ality

•

Improving concrete properties "yaddition of nano particles have shownsignicant improvement thanconventional concrete



%hy nanotechnology forconcrete&

• Improves the materials# "!l'properties

• A"ility to control or manip!latematerials at the atomic scale NANO(CA)EATTAC* ON A(R +A)*A)I (I)ICATE REACTION,

•

To o"tain thinner nal prod!cts andfaster setting time

• Cost e-ectiveness

• )owered levels of environmentalcontamination



%hat is nano concrete&

• A concrete made with portlandcement particles that are less than.//nm as a cementing agent

• C!rrently cement particle si0esrange from a few nano1meters to ama2im!m of a"o!t3// micro meters



NANO MATERIALS

• Car"on Nanot!"es

• Nano1silica

•

4olycar"o2ylates



CARBON NANO TUBES

• Car"on nanot!"es are molec!lar1scale t!"es of graphitic car"on witho!tstanding properties

• They can "e several millimetres inlength and can have one 5layer6 orwall +single walled nanot!"e, or more

than one wall +m!lti wallednanot!"e,



SINGLE WALLED CARBON NANO

TUBES



MULTI WALLED CARBON NANO

TUBES



PROPERTIES

• CNT are also highly 7e2i"le

• 8echanically9 CNT appear to "e thestrongest material

• The smaller diameters

• (ti-est and strongest "ers



NANO SILICA

• Is the rst nano prod!ct thatreplaced the micro silica

• Advancement made "y the st!dy ofconcrete at nano scale have provednano silica m!ch "etter than silica!sed in conventional concrete



NANO SILICA



PROPERTIES

• :igh compressive strengths concretes + 3.

84a and ;. 84a at 3 day< =/ 84a and >/ 84a at ?@ days and =@

84a and 3?/ 84a at 3?/ days,

• :igh wor'a"ility with red!cedwatercement ratio

• Use of s!per plastici0ing additives is!nnecessary

• Bills !p all the micro pores and microspaces

• Cement saving !pto .1=.



POLYCARBOXYLATES

• 4olycar"o2ylates or polymer "asedconcrete admi2t!res are :igh Range%ater Red!cing admi2t!re +:R%R,

• low dosage1red!ce water as m!ch ashigh dosage of conventional admi2t!res

• :igher dosage1prod!ce (elf Compacting

Concrete +(CC,• This admi2t!re type is very s!ita"le for

!nderwater anti1washo!t concrete



POLYCARBOXYLATES



RESULTS

• Resistance to compression 1 =/ to >/84ain 3 dayResistance to compression from;/ a 3// 84a +or more, in ?@ days

• 4rod!ces high resistance even with lowaddition +3 to 3. of the cementsweight, and gives self compacting

characteristics with higher proportions+?. ,



• 8eets the norms of environmentalprotection

• ;/ less !se of additives astraditional silica9 s!per plastici0ers or

traditional "res



ENEBIT( OB NANOCONCRETE

• Cessation of contamination ca!sed"y micro silica solid particles

• )ower cost per "!ilding site

• Concrete with high initial and nalcompressive and tensile strengths

•

Concrete with good wor'a"ility• Cessation of s!per plastici0ing

!tili0ation

•

Cessation of silicosis ris'



CONCLUSION

• %ell dispersed nano particles increasethe viscosity of the li$!id phase9improves the segregation resistance and

wor'a"ility of the system• Accelerates the hydration

• etter "ond "etween aggregates andcement paste

• Improves the to!ghness9shear9tensilestrength and 7e2!ral strength ofconcrete



SCOPE

• If 4ortland cement can "e form!lated withnano1si0e cement particles9 it will open !pa large n!m"er of opport!nities

• The cement will not only "e moreeconomical than organic polymers "!talso will "e re resistant

•

A n!m"er of investigations have "eencarried o!t for developing smart concrete!sing car"on "ers



•

This will "ecome a reality with nano1cement "eca!se nano1car"ont!"esare m!ch more e-ective than car"on"ers The thic'ness of thecomposite can "e red!ced to micronsand hence 7e2i"le and smart cementcomposite can "e man!fact!red



REBERENCE(

F3G alag!r!9 4 N +?//.,9 5Nanotechnology and ConcreteH ac'gro!nd9

Opport!nities and Challenges6 4roceedings of the International Conferenceapplication of Technology in Concrete Design

F?G oresi9 Arth!r 4< Chong9 *en 4< (aigal9 (!nil Appro2imate (ol!tion 8ethods in

Engineering 8echanics9 ohn %iley9 New Jor'9 ?//?9 ?@/ pp

FG alag!r!9 4< and (hah9 (4 Bi"er Reinforced Cement Composites9 8cKraw1:ill9

New Jor'9 3>>?9 ./ pp

F=G 5Concrete69 %i'ipedia9 httpHenwi'ipediaorgwi'iConcrete

F.G (rivastava9 D< %ei9 C< and Cho9 * 5Nanomechanics of car"on nanot!"es and

composites6 Applied 8echanics Review9 .L9 ?//9 ?3.1?/

FLG )I9 K 4roperties of high1vol!me 7y ash concrete incorporating nano1(iO?

Cement and Concrete Research = ?//= 4 3/= M 3/=>F;G 8cCART:J9 8 D:IR9 R* Development of high vol!me 7y ash cement

05012013133324-nano-concrete.ppt

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