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High Strength Concrete

A Natural Pozzolan for High Performance Concrete

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Thinner Elements •Lowermaterialscost •Reducedelementweight •Reducedheatbuildup •Increaseduseablespace •Opportunitiesformoreelegantdesigns

Improved Element Properties •Lesscolumnshortening •Reducedcreep

Reduced Reinforcement •Lowermaterialcost •Fasterconstruction •Simplifiedrebarplacing •Lowerrebarfixingcost •Lessrebarcongestion–improvement concretecompaction

Enhanced Concrete Properties •Betterpumpability •Lowerheatgeneration •Betterformfinish

MICROSILICA 600 — for High Strength Concrete Highstrengthconcrete(HSC)provideseconomicbenefitsthroughthinner(lighter)constructionelementsandreducedconstructiontimes.

Strengthsof100MPaarebeingachievedbyreadymixconcretesuppliersthroughtheuseofMicrosilica600.

NewZealandConcreteDesignStandard–NZ3101,limitstheuseofhighstrengthconcrete.Asbrittlenessincreaseswithstrength,seismicdesignrequirementslimitcompressivestrengthto70MPaforductilestructuresandstructuresoflimitedductility.Otherstructurescanbedesignedusingconcretestrengthsofupto100MPa.

Theuseofhighstrengthconfinementsteel,besidesreducingthecongestingoftransversereinformcementaroundcolumnsandbeamjoints,greatlyimprovestheductilebehaviour.

Table 1. Comparative cost of columns using HSC and normal concrete

Benefits of Microsilica 600 Concrete EconomicsTheuseofMicrosilica600inHSCleadstoeconomicalandfasterconstruction.

GeneralWhereverconcreteelementsareincompression,higherstrengthconcretewillresultinreducedmaterialcost.

Inadditionthereareotherindirectcostsavingswhichcanbesignificant.Thinnertunnelliningsleadtosavingsinexcavation.Lighterstructuresresultsinreducedfoundationrequirements.

Precast ConcreteForpreciseconcreteelements,onsitecartagedemandsarelessened.Transportcostsarereduced.

ColumnsCostanalysiscarriedoutbytheNZCement&ConcreteAssociation(table1)showthatbyincreasingconcretestrengths,financialsavingscanbeachieved.

ItemConventional600mmx500mm40MPaConcrete

HSCOption450mmx450mm70MPaConcrete

Savings

Concrete $8400 $6660 $1740

Reinforcement

Longitudinal $7129 $3210 $3910

Transverse $13360 $9340 $8004

Formwork $23760 $19440 $4320

Total $52640 $38650 $13990

Savings 26.6%

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Physical Properties

Compressive StrengthThepozzolanicreactivity,finepowderpackingmechanismandtheimprovementofbondattheaggregatepasteinterfaceincreasesthestrengthofMicrosilica600concrete.

Laboratorytestseries(Figure1)carriedoutoverayearusingcommerciallyavailableaggregatesandsand,producedaverageresults10%higherthanthoseachievedusingjustPortlandCement.

TheefficiencyofMS600dependsonmanyfactors.Generally,however,Microsilica600doesnotdecrease 7daystrengthsandsignificantincreasesincompressivestrengthofconcreteareobtainedby21days.

Theincreaseinstrengthisinlinewiththelevelsofefficiencyasreportedinthe“GeneralMicrosilica600”brochure.

Drying Shrinkage

Atthesamewater/binderratiothereislittledifferenceinthelongtermshrinkagecharacteristicsofMicrosilica600concreteandstandardconcrete(Figure3).Althoughwatercontentisrecognizedasbeingthemajorcontributortoconcretedryingshrinkage,aggregateandsandpropertiesalsoinfluencetheperformance.

ExtensivetestscarriedoutusingaggregatesandsandssourcedfrommajorNewZealandquarriesproducedawiderangeofshrinkagevalues(figure3).

Figure 1. Strength improvement. In this case 28 day strength increased by 10% but increases of

up to 20% are possible.

Figure 3. Shrinkage of Microsilica 600 concrete is similar to conventional concrete.

Strength Improvement

0102030405060708090

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8% MS600Control

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0 20 40 60Time in days

400-control

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Figure 4. Concrete shrinkage values over time. The influence of aggregate and sand on the shrinkage

properties 10% MS600 dosage.

Figure 3. High strength concrete (105 MPa at 28 days) used for these bridge beams had a release strength after

steam curing (heat maturity 620° CH) of 60 MPa.Whangamarino River Bridge Beams, NZ

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Tensile Strength

Improvedaggregatetopastebondingpropertiesincreasetheconcrete’sinherenttensilestrength.Relativetocompressionstrength,thetensilestrengthofMicrosilica600concreteisgreaterthanconventionalconcrete.

Modulus of Elasticity

ExtensivetestswerecarriedoutonaggregatesobtainedfromfivemajorNewZealandquarries.

Asshownintable2withintherangeofstrengthsconsidered,Microsilica600impactslittleontheModulusofElasticity.Geologicalpropertiesofthecoarsefractionoftheconcreteaggregatesdidinfluenceperformance.

Table 2. Relationship between strength and Modulus of Elasticity.

Figure 6. MS600 was used in concrete for high strength columns,

reducing their size and giving increased usable area.

Figure 5. Microsilica 600 increases the tensile to

compressive strength ratio.

MICROSILICA 600 APPLICATIONS & INFORMATION

Product NoteThe information contained in this brochure is offered in good faith and every effort has been made to ensure its accuracy. However, due to differences in conditions, environments and materials no liability is accepted by Microsilica NZ, Golden Bay Cement or their agents for loss or damage, direct or otherwise, resulting from the application of the information contained herein. Microsilica NZ reserves the right to change product specification without prior notice

MICROSILICANZ POBox1359,ShortlandSt,Auckland1140, NewZealand.Ph6473454710. Emailmicrosilica@goldenbay.co.nz

OtherMicrosilica600applicationsforspecialistconcretesandhighperformanceconcretearedetailedinthefollowingbrochures: •Industrial&CommercialFloors •ChemicalResistantConcrete •WaterproofConcrete •MarineConcrete •Shotcrete

Referenceshouldalsobemadetotheoperationalandsafetyrequirementsinthefollowingdocuments: •Health&SafetyDataSheet •ConcreteMixingInstructions •ConcretePlacement&FinishingProcedures •PlasticPropertiesofMicrosilica600Concrete

Strength MOE

MPa GPa

Control 59 42.4

5%MS600 65 42.1

10%MS600 68 41.5

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Springleaf Towers, Singapore