Materials Research - Effect of the Heat Curing on Strength Development of Self-compacting Mortars Containing Calcined Silt of d

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Materials ResearchPrint versionISSN 1516-1439

Mat. Res. vol.16 no.5 So Carlos Sept./Oct. 2013 Epub June 18, 2013

http://dx.doi.org/10.1590/S1516-1439013005000094

Effect of the heat curing on strength developmentof self-compacting mortars containing calcined

silt of dams and Ground Brick Waste

Safi B.*; Ghernouti Y.; Raehi B.; !outale ".

Research !"it: Materials# $rocesses a"d %"&iro"'e"t ( !R/M$%# !"i&ersit)*o+'erdes# ,lgeria

!BS#R!$#

he stre"gth de&elop'e"t o sel-co'pacti"g 'ortars SM co"tai"i"gcalci"ed silt S a"d gro+"d 2ric aste * as i"&estigated. he

&aria2les are the "at+re o additio" S a"d * i" the 2i"der a"d the heatc+ri"g at diere"t te'perat+res 0 7 a"d 60 7 at 8 a"d 14 da)s oc+ri"g. o te'perat+res 0 a"d 60 7 ere applied to sa'ples ith i"ter'ediate le&els depe"di"g o" the dr)i"g'ethod applied to precast or 1 ho+rs i" total. I" this st+d)# a $ortla"d ce'e"t %MII# alci"ed silt 850 7 or5 ho+rs# gro+"d aste 2ric# ere +sed i" the 2i"ders o SM. he res+lts sho that the co'pressi&e stre"gth to14 da)s o 'ortars# i"creases ith a""eali"g 60 7 co'pared to that 'eas+red at 0 7. ,lso# &al+es oco'pressi&e stre"gth o 'ortars at 14 da)s that are close to those o2tai"ed itho+t da)s c+ri"g treat'e"t.

I"deed# a stre"gth gai" o a2o+t 0.5 a"d 8.3 as o2tai"ed respecti&el) or the SM ith * a"d the SMith S. ;oe&er# a s'all cha"ge i" 'ass recorded or 2oth t)pes o 'ortars.

%e&'ords( ce'e"t# sel-co'pacti"g 'ortar# silt o da's# gro+"d 2ric aste# co'pressi&e stre"gth# 2e"di"gstre"gth# te'perat+re

). ntroduction

Se&eral st+dies ha&e sho" that the peror'a"ce o co"crete ca" 2e sig"iica"tl) i'pro&ed 2) +si"g selected

'i"eral additi&es a"d# especiall)# so'e i"d+strial 2) prod+cts1#

. ra"+lated 2last +r"ace slag **S# l) ash


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their ce'e"titio+s or po==ola"ic properties1-6

. ;oe&er# other i"d+strial 2)-prod+cts as the silt o da's a"d the

aste 2ric that are also +sed i" the or'+latio" o 'ortars a"d co"cretes8#

. Rece"tl)# it as sho" that the silt

o da' has a po==ola"ic pote"tial hich allos it 2e +sed as additi&e. Sai et al.8#9

shoed that the i"trod+ctio" o10 S o sel-co'pacti"g 'ortars ith o 30 o *S 30 has a positi&e eect o" the rheological 2eha&iora"d the de&elop'e"t o stre"gth. ,lso# the gro+"d aste 2ric * as the s+2>ect o se&eral st+dies. he

res+lts o2tai"ed 2) Naceri et al# sho that the additio" o artiicial po==ola" i'pro&es the setti"g ti'es o thece'e"t a"d the 'echa"ical characteristics o 'ortar. I" their or# a s+2stit+tio" o ce'e"t 2) 10 o aste 2ric

i"creased 'echa"ical stre"gths o 'ortar. ,ccordi"g these a+thors# the aste 2ric ca" 2e +sed to prod+ce a

po==ola"ic ce'e"t9

.

I" the 'a"+act+ri"g ield o the precast ele'e"ts# co'pa"ies ala)s tried to red+ce the ti'e o prepari"g theseele'e"ts hile 'ai"tai"i"g the ?+alit) o co"crete. So# to e"s+re a gai" o ti'e# a"d sig"iica"tl) red+ci"g thesetti"g ti'e o co"crete# the par2oili"g dr)i"g process is ote" +sed or this. @+e to high de'a"d prod+ctio" o

co"str+ctio" ele'e"ts# the co"crete i"d+str) has ote" resorted to +se o te'perat+re13#14

. Se&eral 'ethods arede&eloped a"d applied i" order to ha&e a short period o reali=atio" a"d a s+icie"t resista"ce le&els. , rise i"te'perat+re greatl) accelerates the ce'e"t h)dratio" reactio"s a"d aects ad&a"tageo+sl) the short ter'resista"ce. It also red+ces the dor'a"t period o h)drates a"d the o&erall str+ct+re o the h)drated ce'e"t pasteis r+""i"g at a" ad&a"ced ti'e. I"deed# a" i"itial rapid rate o h)dratio" d+e to higher te'perat+res ca+ses a "o

+"ior' distri2+tio" o h)drated prod+cts16

cited i"15#16

. I" the co"str+ctio" o large str+ct+ral co"crete ele'e"tshere heat dissipatio" is slo# a sig"iica"t rise i" te'perat+re ithi" the irst e da)s ater casti"g d+e to theexother'ic reactio" ca" tae place.

I" order to i"&estigate the eect o the dr)i"g te'perat+re o" the stre"gth de&elop'e"t o sel-co'pacti"g

'ortars SMs# the 'ortars ha&e 2ee" prepared ith a 2i"der 'ixt+re 2ased o $ortla"d ce'e"t a"d 'i"eraladditi&es alci"ed Silt S a"d ro+"d *ric aste *. he ater(2i"der ratio +sed is eep co"sta"t /* A0.45 correspo"di"g to SMs ith -da) target 'ea". he ph)sical a"d 'echa"ical tests ere co"d+cted o"pris'atic sa'ples 4x4x16 o SMs heat-treated at 60 7 or 1 ho+rs or e&er) age. he res+lts o these testsere co'pared ith those o2tai"ed at 0 7 roo' te'perat+re.

+. E,perimental rogram

.1. Materials used

he 'aterials +sed i" this or ere $ortla"d ce'e"t $ %M II 3.5R# calci"ed silt S rec+perated ro' theda' o


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ith a" i"ter'ediate stop or 1 ho+rs accordi"g to the dr)i"g i"etics gi&e" i"


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he res+lts sho that the 'ortar has a lo l+idit) SMS co'pared to other 'ortars hile the l+idit) o theSM* 'ortar i"creased slightl) co'pared to that o reere"ce SMR 'ortar. his is explai"ed 2) thecalci"ed silt hich has a higher s+race area a"d higher porosit) tha" the gro+"d 2ric aste. his silt a2sor2s'ore ater ith respect to the grai"s o * hich ha&e spherical or'. he res+lt shos that * has i'pro&ed

l+idit). It has 2ee" sho" that the calci"ed silt a2sor2s 'ore ater tha" the gra"+lated slag8.


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3.. Bulk density of mortars MBAP

he res+lts o de"sit) 'eas+red o the SMs 'ortars st+died are sho" i"


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3.3. Mechanical resistance of self-compacting mortars

he 'echa"ical test res+lts o" 'ortars st+died are gi&e" i"


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rials Research - Effect of the heat curing on strength development of... http://www.scielo.br/scielo.php?pid=S1516-14392013000500015

3 9/12/2014


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," i"crease o the 2e"di"g a"d co'pressi&e stre"gth as +"ctio" o age 3# 8# 14# 1 a"d da)s as o2ser&ed

or all 'ortars. hat is the phe"o'e"o" o h)dratio" o ce'e"t hich ca+ses the e&ol+tio" o co'pact"ess ithc+ri"g ti'e. I"deed# the h)dratio" o the co'po"e"ts o ce'e"t

3S a"d

S gi&e 2irth o the calci+' silicate

h)drate S; hich i"crease resista"ce. It is "oted that# at da)s the reere"ce 'ortar prese"ts resista"ce&al+es slightl) loer co'parati&el) ith those o the SMS a"d SM* 'ortars


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is pro2a2l) d+e the eect o te'perat+re# hich accelerates the h)dratio" reactio"s. ,s a" exa'ple# gai"s oco'pressi&e stre"gth at da)s ere o2tai"ed i" order o 8 a"d .5 respecti&el) or SM* a"dSMS treated 'ortars at 60 7.

he * a"d S ha&e a high i"e"ess# a"d its speciic eight is loer tha" that o the ce'e"t# 2oth o hichi"creased the a'o+"ts o co"siste"c) ater i" relatio" ith the * a"d S additio"


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ther'al treat'e"t# are al'ost si'ilar or so'eti'es 2etter tha" those o2tai"ed 2) "o"-heat treated 'ortars at da)s


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d+e to the reactio" o ce'e"t h)dratio" at short-ti'e 2eore 14 da)s. I"deed# the eight sa&i"g o the 'ortarssa'ples ith additio"s is al'ost si'ilar to the reere"ce 'ortar itho+t additio"s that is d+e to the positi&e eect

o the 'i"eral additio"s ro' poi"t o a selli"g &ie3#8

.

/. $onclusion

he o2>ecti&e o this st+d) as to e&al+ate the ph)sical-'echa"ical 2eha&ior o sel co'pacti"g co"crete'ortar-2ased calci"ed silt S a"d gro+"d 2ric aste *# +"der the te'perat+re eect. I" order to st+d) theperor'a"ce o sel co'pacti"g 'ortars o"crete e?+i&ale"t 'ortar +"der the dr)i"g te'perat+re eect appliedc+rre"tl) or the prea2ricated ele'e"ts i" 2+ildi"g. he res+lts o2tai"ed i" this st+d)# sho clearl) that it ispossi2le to +se the Sel-co'pacti"g or'+latio"s co"tai"i"g the calci"ed silt a"d gro+"d 2ric aste ro' the 2ricprod+ct. I"deed# the res+lts sho that:

F he l+idit) o sel-co'pacti"g 'ortar SMs# has i'pro&ed i" the gro+"d 2ric aste. , l+idit) lossis recorded or SMs 'ortars i" the prese"ce o calci"ed siltG it ca" 2e i'pro&ed 2) i"creasi"g thedosage o s+perplastici=erG

F , eight gai" is o2tai"ed +si"g this t)pe o additio" i" sel-co'pacti"g co"creteG


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F he 'echa"ical stre"gth co'pressi&e stre"gth a"d 2e"di"g stre"gth are sig"iica"tl) i'pro&ed i"the prese"ce o the calci"ed silt a"d the gro+"d 2ric asteG

F ;eat treat'e"t 60 7 sig"iica"tl) i'pro&es the 'echa"ical peror'a"ce o SMs 'ortars. ,t 14da)s# the co'pressi&e stre"gth recorded ith heat-treat'e"t o SM

S'ortars is close or sa'e to that

reere"ce 'ortar SMRG

F , stre"gth gai" is o2tai"ed i" the ra"ge 0 a"d 8.5 respecti&el) or SMS a"d SM*'ortars ith heat treat'e"t at 60 7G a"d

F , eight gai" is recorded a2o+t 0.11 or all SMs 'ortars 2ased aste 2ric ro' the reere"ce'ortar. *) co"s# 'ass loss is o2ser&ed or those 2ased o" the calci"ed silt.

It o+ld 2e &er) i"teresti"g to co'plete this st+d) o" or'+latio"s o sel-co'pacti"g co"crete S# +si"g thete'perat+re o 60 7 a"d 100 7.

References

1. Hia $# e'i"g M a"d ,h'ad S;. ;igh-peror'a"ce co"cretes: , State-o-the-,rt Report# S;R$-/ec # $o==ola"ic 'ortars 2ased o" aste 2+ildi"g 'aterialsor the restoratio" o historical 2+ildi"gs. Chemical 'ndustry and Chemical #ngineering ,uarterly. 01G1:148-154. http://dx.doi.org/10.9/I%V1109056$

11. ild S. C2ser&atio"s o" the +se o gro+"d aste cla) 2ric as a ce'e"t replace'e"t 'aterial. Building"esearch and 'nformation. 1996G 41:35-40. http://dx.doi.org/10.100/09613196088496 J i"sK

1. Eapra ; a"d Si'se C. $eror'a"ce o ce'e"t 'ortars replaced 2) gro+"d aste 2ric i" diere"t aggressi&eco"ditio"s. Ceramics -Silikty. 011G 553:6-85. J i"sK

13. %drogd+ S a"d L+r2etci S. Cpti'+' heat treat'e"t c)cle or ce'e"t o diere"t t)pe a"d co'positio".Cement and Concrete "esearch.199G 11:1595-1604. http://dx.doi.org/10.1016/S000-46900134-3

J i"sK


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14. Ne&ille ,M. hapter . e'perat+re eects i" co"crete. I": $roperties o co"crete. $aris: %ditio"s %)rollesG000. p. 345-350. J i"sK

15. L>ellse" LC. ;eat c+ri"g a"d post c+ri"g regi'es o high peror'a"ce co"crete: i"l+e"ce o" 'icrostr+ct+rea"d -S-; co'positio". Cement and Concrete "esearch. 1996G 6:95-308. http://dx.doi.org/10.1016

/000-4695000- J i"sK

16. Ter2ec a"d ;el'+th R;. Str+ct+res a"d ph)sical properties o ce'e"t paste. I": Proceedings of the .th'nternational Symposium on the Chemistry of CementG 196G o)o. o)oG 196. part II. p. 1-3. J i"sK

18. Se'cha ,. /alorisation des s0diments de dragage: ,pplicatio"s da"s le *$# cas d+ 2arrage de .ce'co"res.005.1.004 J i"sK

Recei&ed: No&e'2er 9# 01Re&ised:

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Materials Research - Effect of the Heat Curing on Strength Development of Self-compacting Mortars Containing Calcined Silt of d