micro silica concrete

7/21/2019 Micro Silica Concrete

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MICRO SILICACONCRETE

1

Guided By: Presented By:

Mr. Srishyam M.S Shibin Mohamed Iqbal

Asst. Professore!t. Of Ci"il

Roll No.1#S1 Mte$h CEM

MES CE MES CE


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O"er"ie% Introd&$tion

Mi$rosili$a in $on$rete

E'!eriment Case st&dy

E'am!les

Con$l&sion referen$e

(


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Introd&$tion )hat is mi$ro sili$a*

o+ery ,ne non $rystalline sili$a !rod&$edin ele$tri$ ar$ f&rna$es as a by!rod&$t of

the !rod&$tion of elemental sili$on oralloys $ontainin- sili$on

oACI 11#Ro

a./.a $ondensed sili$a f&me

0


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Mean !arti$le sie2bet%een 3.1 4 3.(

mi$rons S!heri$al in sha!e

Parti$les almost 133 times smaller than

$ement !arti$les Chemi$al $om!osition2lar-ely sili$a5 6378

remainin- other metalli$ o'ides and some$arbon.

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:

Item Req&irement

578

SiO( 6;.#

Al(O0 3.;3

(O 3.=3

Na(O 3.(#


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E'tra$ted at smeltin- !lants is a"ailable int%o -rades2 standard and refra$tory

Standard $ommonly &sed for $on$rete

Refra$tory e"en ,ner %ith hi-h sili$a$ontent and &sed in other s!e$ialied!rod&$ts

#


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Mi$ro sili$a !rod&$tion

=


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Ra% materials !&t into smelter

Materials are blended into a $har-efor the f&rna$e

Deated to a tem!erat&re of (3333C

Sili$a f&me $olle$ted in ba- ho&se

,lter of the e'ha&st of smelter.

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10


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Mi$rosili$a forms

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As2!rod&$ed !o%der

)ater2based sl&rry

ensi,ed Flended sili$a2f&me $ement

Pelletied


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1:


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Mi$ro sili$a in $on$rete )hy &se mi$ro sili$a in $on$rete*

o Mi$ro sili$a is a %aste !rod&$toTreated as breathable d&st

o Contains tra$e amo&nts of $rystalline q&arto Req&ires lots of safety !re$a&tions and

eq&i!ment to handleo On$e in$or!orated into $on$rete there is no

!otential for d&st -enerationo Re-&lar safety !re$a&tions for $on$rete

handlin- %ill do

1#


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O!tim&m !er$enta-e of

mi$rosili$a in $on$reteo o!tim&m "al&e of $om!ressi"e stren-th

a$hie"ed in 137 re!la$ement ofmi$rosili$a. 5.>.S Roy and Amita"a Sil8

oCom!ressi"e stren-th de$reases %hen$ement re!la$ement is abo"e 1:7 ofmi$rosili$a. 5+. AGay et.al8

o Stren-th of 1:7 re!la$ement more thannormal $on$rete. 5+. AGay et.al8

1;


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Im!ro"ement of $on$rete bymi$ro sili$a thro&-h t%ome$hanismso

Pooloni$ eBe$toMi$ro ,ller eBe$t

1=


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Pooloni$ eBe$to On hydration of $ement t%o !rod&$ts are

formed CSD and

Ca5OD8(o

sili$on dio'ide in S< %ill rea$t %ith Ca5OD8( to!rod&$e more a--re-ate bindin- CSD.

o the rea$tion red&$es the amo&nt of $al$i&m

hydro'ide %hi$h does not $ontrib&te to

stren-th.o Also $al$i&m hydro'ide $ombines %ith $arbon

dio'ide to form sol&ble salts %hi$h %ill $a&selea$hin- and eHores$en$e in $on$rete.

o

Con$rete also "&lnerable to s&l!hate atta$/$hemi$al atta$/ and ad"erse al/ali2 a--re-ate16


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Mi$ro ,ller eBe$to Mi$ro sili$a is e'tremely ,ne material.o A"era-e diameter 100 times fner than

$emento At a ty!i$al dosa-e of 137 by %ei-ht of

$ement a!!ro'imately 133333 !arti$les for

ea$h -rain of $ement %ill ,ll the %ater s!a$esin fresh $on$rete.

oThis eliminates bleed and weak transitionzonebet%een a--re-ate and !aste fo&nd in

normal $on$rete.o Mi$ro ,ller eBe$t also red&$es permeability

and im!ro"es !aste to a--re-ate bond in Sol/ata.

AimoTo st&dy the eBe$t of !artial re!la$ement of

$ement by S< 5from :7 to 137 %ith ste! of(.:78 on M(3 -rade $on$rete desi-ned %ith OPC:0 -rade $ement sand and $o&rse a--re-ate.

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Materialso :0 -rade Portland $emento Jone II sando 1(.:mm2 (3mm do%n-raded a--re-ateo Commer$ial mi$ro sili$a -rade 6(3 5s!e$i,$

s&rfa$eK(1.9 b&l/ densityK#(3/-@m08o Mi' !ro!ortion 1?1.9=:?0.190 for M(3 -rade 5IS

13(#(?(3368 $on$rete %ith the follo%in-in-redients

Cement K :00.3:/-@m0 SandK ;61.:=/-@m0

)ell -raded a--re-ate K 1#;:/-@m0

%ater $ement ratio K 3.9: for all mi'es

(9


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Sam!le !re!aration and !ro!ertiesst&diedo A--re-ates $ement and S< is $har-ed in to

mi'er ma$hineo ry mi' follo%ed by addition of %ateroThen rotated s&$iently to a$hie"e &niform

and hi-h %or/able mi'o Com!a$tion fa$tor ha"e been meas&red.

(:


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(#


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o The $on$rete then !la$ed into

1:3mm $&be

1:3mm diameter ' 033mm hi-h $ylinder

133mm ' 133mm ' :33mm !rism mo&lds

o +ibrated %ith standard "ibratoro (9 ho&r $&rin- in mo&lds %ith hessian $lothes at (3 to

(93C follo%ed by &nder %ater $&rin- &ntil the day oftestin-.

o ; days and (= days $om!ressi"e stren-th of $&bes and

$ylinder s!lit tensile stren-th and e'&ral stren-th ha"ebeen meas&red.

(;


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Test res&lts and dis$&ssions

A.


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F. Dardened state

1. Com!ressi"e stren-tho )hen $ement re!la$ed by S


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01


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0(

5So&r$e? ili! >&mar Sin-ha Roy. et al (31(8

Table.1. Com!ressi"e stren-ths of $&be and$ylinder $orres!ondin- to the mi$rosili$a $ontent.


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(. S!lit tensile stren-th

Ma'im&m $ylindri$al s!lit tensile stren-th%as fo&nd to be 0=.:7 more than that of

normal $on$rete 5137 re!la$ement8.

00


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0.


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Ad"anta-es Di-h early $om!ressi"e stren-th

Di-h tensile e'&ral stren-th and mod&l&s ofelasti$ity

+ery lo% !ermeability to $hloride and %aterintr&sion

Enhan$ed d&rability

In$reased to&-hness

In$reased abrasion resistan$e on de$/s oorso"erlays and marine str&$t&res

S&!erior resistan$e to $hemi$al atta$/ from$hlorides a$ids nitrates and s&lfates

life2$y$le $ost e$ien$ies.

Di-her bond stren-th

0#


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isad"anta-es A"ailability

Di-her %ater req&irement

S/illed labo&r

A!!li$ation e$onomi$al only on lar-e s$ale

0;


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Case st&dy2I

0=

in&a am SA.5so&r$e? el/em8


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Rehabilitation of /in&a dam SA

hi-h !erforman$e mi$rosili$a $on$reteeroded m&$h slo%er than !re"io&s state2of2the2art $on$retes &sed to re!air the

dam. Ins!e$tions of the dam at 13 years ser"i$e

ba$/ed &! these ,ndin-s estimatin- thatthe dam had a !otential lifetime many

times lon-er than a$hie"ed before there!air.

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$on$rete mi't&reo Cement K 0=#/-@m0

o Sili$a f&me sl&rry 59#7 dry !o%der8 K1:#/-@m0

o Coarse a--re-ate K 6;1/-@m0

o


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Case st&dy 2 II A !ar/in- str&$t&re %as b&ilt in -eneral Mit$hel

air!ort Mil%a&/ee )is$onsin %ith the follo%in-req&irements?o Resist $hloride ion !enetration

o Attain $om!ressi"e stren-ths of? 19 M!a at 0# ho&rs

93MPa at :# days

o Par/in- str&$t&re for (033 "ehi$leso Str&$t&re %as !ost tensioned

o Req&irement of 0# ho&r stren-th %as to allo% !osttensionin-

o Mi$rosili$a $on$rete alternati"e %as fo&nd to be lessthan half the $ost of $on"entional method.

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(oncrete )i*ture:oPortland $ement K 00: /-@m0

o


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Res&ltCom!ressi"e stren-th

0# ho&rs Q 19 MPa

Sl&m! &sed? 1:32 63 mm

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9:

Petronas +ower, -uala.ampur Col&mns? rade =3 Feams? rade #3 P&m!ed == storeys

hi-h Tri!le blend?

OPC@yash@mi$rosili$a

Other e'am!les


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9#

Bur/ -alia,

2ubai 0:3 333 m0 hi-h

stren-th $on$rete 5=3and #3 MPa s!e$8

P&m!in- all the %ay sin-le sta-e

Ternary blends PC@


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9;

2ubai 3nternational 4irportMi$rosili$a $on$rete e'tensi"ely &sed ford&rability reasons in s&b2terrain $on$rete

and in hi-h2stren-th str&$t&ral $on$reteelements in the e'tensions of the &baiair!ort 5( million m08


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$on$l&sions Sili$a f&me $on$rete fa$ilitates the

ado!tion of lo%er %ater $ement ratio.

better hydration of $ement !arti$les

in$l&din- stron- bondin- amon-st!arti$les.

Ma'im&m $om!ressi"e stren-th is notedfor 137 re!la$ement of $ement %ith sili$a

f&me and the "al&es are hi-her than thoseof normal $on$rete.

S!lit tensile stren-th and e'&ral stren-th

of the mi$ro sili$a $on$rete are in$reased 9=


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Contd As S< $on$rete is more $om!a$t and more

d&rable in nat&re and hen$e %ith somede-ree of q&ality $ontrol it may be &sed in!la$es %here there is a $han$e of $hemi$alatta$/ frost a$tion et$.

)ith -ood q&ality $ontrol hi-h early stren-th$an be a$hie"ed in S< $on$rete %hi$h may be&sef&l in "ario&s str&$t&ral $onstr&$tions s&$has hi-h2rise b&ildin-s brid-es $himneysma$hine fo&ndations r&n%ays et$.

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referen$e .>.S Roy Amita"a Sil eBe$t of !artial re!la$ement of $ement by

sili$a f&me on hardened $on$rete IUETAE 5A&-&st (31(8!!9;(29;:.

+. AGay C.RaGee" and yada" R.>.eBe$t of mi$rosili$a on the stren-thof $on$rete %ith ordinary !ortland $ement Res.U.En-ineerin- S$i.5se!t. (31(8 !!129.

Ma-&deas%aran P Es%aramoorthi P E'!erimental in"esti-ations ofme$hani$al !ro!erties on mi$rosili$a and y ash as !artial $ementre!la$ement of hi-h !erforman$e $on$rete IOSR2UMCE 5U&n. (3108!! :;2#0.

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