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NANO CONCRETE
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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
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%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
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%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
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NANO MATERIALS
• Car"on Nanot!"es
• Nano1silica
•
4olycar"o2ylates
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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,
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SINGLE WALLED CARBON NANO
TUBES
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MULTI WALLED CARBON NANO
TUBES
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PROPERTIES
• CNT are also highly 7e2i"le
• 8echanically9 CNT appear to "e thestrongest material
• The smaller diameters
• (ti-est and strongest "ers
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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
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NANO SILICA
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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=.
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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
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POLYCARBOXYLATES
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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+?. ,
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• 8eets the norms of environmentalprotection
• ;/ less !se of additives astraditional silica9 s!per plastici0ers or
traditional "res
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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'
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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
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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
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•
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
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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
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