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Efect o types o curing on strength o geopolymer concrete

K Vijai 

R Kumutha

B G Vishnuram

Department of Civil Engineering, Sethu Institute of Technolog, In!ia

International "ournal of the #hsical Sciences $%&'$($) *+((%-('./

ABSTRACT In or!er to a!!ress environmental e0ects associate! 1ith #ortlan!

cement, there is nee! to !evelop alternative 2in!ers to ma3e concrete/ 4n e0ort

in this regar! is the !evelopment of geopolmer concrete, snthesi5e! from the

materials of geological origin or 2 pro!uct materials such as 6 ash, 1hich are

rich in silicon an! aluminum/ This paper presents results of an e7perimental

stu! on the !ensit an! compressive strength of geopolmer concrete/ Thee7periments 1ere con!ucte! on 6 ash 2ase! geopolmer concrete 2 varing

the tpes of curing namel am2ient curing an! hot curing/ The ratio of al3aline

li8ui! to 6 ash 1as 97e! as $// :or all the samples the rest perio! 1as 3ept as

* !as/ :or hot curing, the temperature 1as maintaine! at ;$ o C for ' h in hot

air oven/ The compressive strength test 1as con!ucte! for each sample an! the

results sho1e! that there is an increase in compressive strength 1ith the

increase in age for am2ient cure! specimens/ :or hot cure! samples the increase

in compressive strength 1ith age 1as ver less as compare! to that of 

specimens su2jecte! to am2ient curing/ The !ensit of geopolmer concrete 1as

aroun! '$$ 3g&m . 1hich is e8uivalent to that of conventional concrete/

Predictions of long-term deflection ofgeopolymer concrete beams

C.H. Un

J.G. Sanjayan

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R. San Nicolas

Jannie S J Van Deventer

43.60 · University of Melbourne

 Abstract

The long-term behaviour of concrete beams constructed with geopolymer

concrete (GPC) is investigated. elf-weight and sustained load of ! "Pa are

applied on top of the beams at the age of !# days to simulate construction

conditions. Creep tests on cylinders conducted with sustained loading

commenced at the ages of !# days and $% days. The results from creep tests

on GPC show higher creep in the specimens loaded at !# days than those

loaded at $% days. Predictions of beam deflections are performed by using

&C' '' and A'' with input parameters of properties of GPC from

e*perimental data including elastic modulus modulus of rupture creep

and shrin"age. These property tests show that GPC can achieve sufficient

strength for structural designs but both compressive strength and fle*ural

tensile strength are affected by drying which causes differential drying

shrin"age and microcrac"ing at the drying surfaces. The predicted

deflections by these analysis methods are compared with the e*perimental

results from beams and show that &C' gives the worse performance of the

three methods. The investigation concludes that the A'' can be used for

long-term deflection calculations for GPC beams with minor parameter

modifications.

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Article: Effect of sodium hydroxide concentration on chloride penetration and steel

corrosion of fly ash-based geopolymer concrete under marine site

P. Chindaprasirt · W. Chalee[Hide abstract]

ABSTRACT: In this research, the effect of sodium hydroxide (a(!H"" concentrations on

chloride penetration, steel corrosion and compressi#e stren$th of fly ash%based $eopolymer 

concretes under marine en#ironment &ere studied. 'he $eopolymer concrete &ere prepared

from class C fly ash &ith sodium silicate (a)i!*" and sodium hydroxide (a(!H""

solutions. 'he concentrations of a(!H" of +, -, , , / and + molar, and the constant

molar ratio of )i!01l!* &ere used. 'he -- x -- x -- mm(*" concrete cube specimens

&ith steel bar embedded at co#erin$s of -, 2- and 32 mm &ere in#esti$ated. 'he specimens

&ere air%cured in laboratory for + days and then &ere exposed to tidal 4one of marine

en#ironment in the 5ulf of 'hailand. 1fter *%year exposure, the specimens &ere tested for 

compressi#e stren$th, chloride penetration and corrosion of embedded steel bar. 'he results

sho&ed that the chloride penetration and corrosion of embedded steel decreased &ith the

increasin$ of a(!H" concentration. 'he steel corrosion &as related to the compressi#e

stren$th of $eopolymer concrete. 'he corrosion is hi$h &ith the concrete of lo& compressi#e

stren$th. In addition, increasin$ the a(!H" concentration in $eopolymer concrete resulted in

a decrease in the chloride bindin$ capacity.

Conference Paper: racture Properties of !eopolymer Concrete Cured in Ambient

Temperature

Pradip ath · Prabir 6umar )ar7er 

[Hide abstract]

ABSTRACT: 5eopolymer concrete (5PC" is a promisin$ alternati#e of ordinary Portland

cement (!PC" concrete. 8ecent studies indicate potential benefit of heat cured $eopolymer 

concrete in structural applications. 'his study aimed at the fracture beha#ior of fly ash based

$eopolymer concrete cured in ambient temperature. 5eopolymer concretes &ere prepared

&ith mainly fly ash as the binder &hich &as acti#ated by a mixture of sodium hydroxide and

sodium silicate solutions. 5round 5ranulated 9last :urnace )la$ (559:)" &as added up to

-; of total binder and amount of al7aline solution &as #aried to determine the effect on

concretes sub<ected to ambient curin$. otched beam specimens &ere cast and cured in air at

/=>C and 3- ? -; relati#e humidity. 'hree%point bendin$ test &as conducted usin$ a

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closed%loop uni#ersal testin$ machine. 'he fracture ener$y #alues &ere calculated from the

load%deflection cur#es of the test specimens by usin$ the &or7 of fracture method. 'he

critical stress intensity factors of the specimens &ere also calculated. 'he load%deflection

cur#es and the fracture beha#ior of different $eopolymer concretes &ere compared.

5enerally, the fracture ener$y #aried &ith the stren$th of the concrete. 'he fracture ener$y of 

concrete ha#in$ sla$ in addition to fly ash &as hi$her than that ha#in$ only fly ash.

5eopolymer concretes achie#ed hi$her fracture ener$y #alues as compared to !PC concrete

of similar compressi#e stren$th.

Carbonation of Hi$h )tren$th Concrete Containin$ Class : :ly 1sh

<ath, #ra!ip an! Sar3er, #ra2ir

Carbonation is one of the ma<or causes for corrosion of reinforcement, &hich reduces ser#ice

life of concrete structures si$nificantly. 'he performance of fly ash concrete in resistin$

carbonation #aries &idely. In this paper, hi$h stren$th concrete containin$ fly ash &as

e#aluated a$ainst carbonation. 1 locally sourced class : fly ash &as used as *-; and -; of 

total binder in concrete. '&o series of concrete &ere desi$ned@ one &ith ad<usted &ater to

 binder ratio (&0b" and total binder content to account for the inclusion of fly ash and the other 

series &ith constant binder content and &0b ratio. 1ir permeability and carbonation tests &ere

carried out. Aarly a$e properties &ere used alon$ &ith some selected parameters to predict

ser#ice life a$ainst carbonation &ith the fib model code. :ly ash concretes &ith ad<usted mix

 proportions achie#ed similar +%day compressi#e stren$th and eBui#alent air permeability and

carbonation depth as compared to the control concrete. :ly ash concretes sub<ected to

carbonation achie#ed similar ser#ice life of control concrete of similar stren$th $rade. 'he

results sho& that, it is necessary to ad<ust the mixture proportions to account for fly ash in

order to achie#e eBui#alent ser#ice life as that of the control concrete.

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