2024年5月13日发(作者：召翠芙)

Designation:C1609/C1609M–10

StandardTestMethodfor

FlexuralPerformanceofFiber-ReinforcedConcrete(Using

BeamWithThird-PointLoading)

1

ThisstandardisissuedunderthefixeddesignationC1609/C1609M;thenumberimmediatelyfollowingthedesignationindicatesthe

yearoforiginaladoptionor,inthecaseofrevision,rinparenthesesindicatestheyearoflast

scriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.

*

1.1Thistestmethodevaluatestheflexuralperformanceof

fiber-reinforcedconcreteusingparametersderivedfromthe

load-deflectioncurveobtainedbytestingasimplysupported

beamunderthird-pointloadingusingaclosed-loop,servo-

controlledtestingsystem.

1.2Thistestmethodprovidesforthedeterminationof

first-peakandpeakloadsandthecorrespondingstresses

calculatedbyinsertingthemintheformulaformodulusof

requiresdeterminationofresidual

loadsatspecifieddeflections,thecorrespondingresidual

strengthscalculatedbyinsertingthemintheformulafor

modulusofrupturegiveninEq1(seeNote1).Itprovidesfor

determinationofspecimentoughnessbasedontheareaunder

theload-deflectioncurveuptoaprescribeddeflection(see

Note2)andthecorrespondingequivalentflexuralstrength

ratio.

N

OTE

1—Residualstrengthisnotatruestressbutanengineeringstress

computedusingsimpleengineeringbendingtheoryforlinearelastic

materialsandgross(uncracked)sectionproperties.

N

OTE

2—Specimentoughnessexpressedintermsoftheareaunderthe

load-deflectioncurveisanindicationoftheenergyabsorptioncapability

oftheparticulartestspecimen,anditsmagnitudedependsdirectlyonthe

geometryofthetestspecimenandtheloadingconfiguration.

responsibilityoftheuserofthisstandardtoestablishappro-

priatesafetyandhealthpracticesanddeterminetheapplica-

bilityofregulatorylimitationspriortouse.

ncedDocuments

2.1ASTMStandards:

2

C31/C31MPracticeforMakingandCuringConcreteTest

SpecimensintheField

C42/C42MTestMethodforObtainingandTestingDrilled

CoresandSawedBeamsofConcrete

C78TestMethodforFlexuralStrengthofConcrete(Using

SimpleBeamwithThird-PointLoading)

C125TerminologyRelatingtoConcreteandConcreteAg-

gregates

C172PracticeforSamplingFreshlyMixedConcrete

C192/C192MPracticeforMakingandCuringConcrete

TestSpecimensintheLaboratory

C823PracticeforExaminationandSamplingofHardened

ConcreteinConstructions

C1140PracticeforPreparingandTestingSpecimensfrom

ShotcreteTestPanels

ology

3.1Definitions—Thetermsusedinthistestmethodare

definedinTerminologyC125.

3.2DefinitionsofTermsSpecifictoThisStandard:

3.2.1end-pointdeflection,n—thedeflectionvalueonthe

load-deflectioncurveequalto

1

⁄

150

ofthespanlength,ora

largervalueasspecifiedattheoptionofthespecifieroftests.

3.2.2first-peakload,P

1

,n—theloadvalueatthefirstpoint

ontheload-deflectioncurvewheretheslopeiszero.

3.2.3first-peakdeflection,d

1

,n—thenetdeflectionvalueon

theload-deflectioncurveatfirst-peakload.

3.2.4first-peakstrengthf

1

,n—thestressvalueobtained

whenthefirst-peakloadisinsertedintheformulaformodulus

ofrupturegiveninEq1.

3.2.5load-deflectioncurve,n—theplotofloadversusnet

deflectionofaflexuralbeamspecimenloadedtotheend-point

deflection.

ForreferencedASTMstandards,visittheASTMwebsite,,or

contactASTMCustomerServiceatservice@ualBookofASTM

Standardsvolumeinformation,refertothestandard’sDocumentSummarypageon

theASTMwebsite.

2

1.3Thistestmethodutilizestwopreferredspecimensizes

of100by100by350mm[4by4by14in.]testedona300mm

[12in.]span,or150by150by500mm[6by6by20in.]

testedona450mm[18in.]mensizedifferent

fromthetwopreferredspecimensizesispermissible.

1.4Units—ThevaluesstatedineitherSIunitsorinch-

valuesstatedineachsystemmaynotbeexactequivalents;

therefore,eachsystemshallbeusedindependentlyoftheother.

Combiningvaluesfromthetwosystemsmayresultinnon-

conformancewiththestandard.

1.5Thisstandarddoesnotpurporttoaddressallofthe

safetyconcerns,ifany,e

ThistestmethodisunderthejurisdictionofASTMCommitteeC09on

ConcreteandConcreteAggregatesandisthedirectresponsibilityofSubcommittee

C09.42onFiber-ReinforcedConcrete.

CurrenteditionapprovedMarch1,ally

eviouseditionapprovedin2007asC1609/C1609M–07.

DOI:10.1520/C1609_C1609M-10.

1

*ASummaryofChangessectionappearsattheendofthisstandard.

Copyright©ASTMInternational,100BarrHarborDrivePOBoxC-700,WestConshohocken,Pennsylvania19428-2959,UnitedStates

Copyright by ASTM Int'l (all rights reserved); Thu Sep 20 01:51:44 EDT 2012

1

Downloaded/printed by

Washington State University pursuant to License Agreement. No further reproductions authorized.

C1609/C1609M–10

entoughnessisa

measureoftheenergyabsorptioncapacityofthetestspecimen.

Theappropriatenessofeachparameterdependsonthenature

oftheproposedapplicationandthelevelofacceptablecrack-

inganddefl-reinforcedconcreteis

influencedindifferentwaysbytheamountandtypeoffibersin

cases,fibersmayincreasetheresidual

loadandtoughnesscapacityatspecifieddeflectionswhile

producingafirst-peakstrengthequaltooronlyslightlygreater

thantheflexuralstrengthoftheconcretewithoutfi

othercases,fibersmaysignificantlyincreasethefirst-peakand

peakstrengthswhileaffectingarelativelysmallincreasein

residualloadcapacityandspecimentoughnessatspecified

deflections.

5.2Thefirst-peakstrength,peakstrength,andresidual

strengthsdeterminedbythistestmethodreflectthebehaviorof

fiber-reinforcedconcreteunderstaticfl

absolutevaluesofenergyabsorptionobtainedinthistestareof

littledirectrelevancetotheperformanceoffiber-reinforced

concretestructuressincetheydependdirectlyonthesizeand

shapeofthespecimenandtheloadingarrangement.

5.3Theresultsofthistestmethodmaybeusedforcom-

paringtheperformanceofvariousfiber-reinforcedconcrete

yalso

beusedtomonitorconcretequality,toverifycompliancewith

constructionspecifications,obtainflexuralstrengthdataon

fiber-reinforcedconcretememberssubjecttopurebending,or

toevaluatethequalityofconcreteinservice.

5.4Theresultsofthisstandardtestmethodaredependent

onthesizeofthespecimen.

N

OTE

5—Theresultsobtainedusingonesizemoldedspecimenmaynot

correspondtotheperformanceoflargerorsmallermoldedspecimens,

concreteinlargestructuralunits,

differencemayoccurbecausethedegreeofpreferentialfiberalignment

becomesmorepronouncedinmoldedspecimenscontainingfibersthatare

relativelylongcomparedwiththecross-sectionaldimensionsofthemold.

Moreover,structuralmembersofsignificantlydifferentthicknessexperi-

encedifferentmaximumcrackwidthsforagivenmid-spandeflectionwith

theresultthatfibersundergodifferentdegreesofpull-outandextension.

3.2.6netdeflection,n—thedeflectionmeasuredatmid-span

ofaflexuralbeamspecimenexclusiveofanyextraneous

effectsduetoseatingortwistingofthespecimenonits

supportsordeformationofthesupportandloadingsystem.

3.2.7peakload,P

P

,n—themaximumloadontheload-

deflectioncurve.

3.2.8peak-loaddeflection,d

P

,n—thenetdeflectionvalue

ontheload-deflectioncurveatpeakload.

3.2.9peakstrength,f

P

,n—thestressvalueobtainedwhen

thepeakloadisinsertedintheformulaformodulusofrupture

givenbyEq1.

3.2.10D—nominaldepthofthebeamspecimeninmm.

N

OTE

3—Tosimplifynomenclature,thenominalbeamdepthisshown

inunitsofmmforboththeSIandinch-poundversionofthistestmethod.

3.2.11L—spanlengthordistancebetweenthesupports.

3.2.12residualload,P

D

600

,n—theloadvaluecorrespond-

ingtoanetdeflectionofL/600forabeamofnominaldepthD.

3.2.13residualload,P

D

150

,n—theloadvaluecorresponding

toanetdeflectionofL/150forabeamofnominaldepthD.

3.2.14residualstrength,f

D

600

,n—thestressvalueobtained

D

whentheresidualloadP

600

isinsertedintheformulafor

modulusofrupturegiveninEq1.

3.2.15residualstrength,f

D

150

,n—thestressvalueobtained

D

whentheresidualloadP

150

isinsertedintheformulafor

modulusofrupturegiveninEq1.

3.2.16specimentoughness,T

D

150

,n—toughnessofbeam

specimenofnominaldepthDatanetdeflectionofL/150.

D

3.2.17equivalentflexuralstrengthratio,R

T,150

,n—the

D

valueobtainedwhenthespecimentoughnessT

150

isinsertedin

Eq3.

N

OTE

4—Theequivalentflexuralstrengthratioiscalculatedastheratio

oftheweightedequivalentloaduptoanetdeflectionofL/150overthe

fi

150

T,150

valueisequivalenttothe

R

e,3

valuedefinedintheTechnicalReportNo.34oftheConcreteSociety.

3

yofTestMethod

4.1Moldedorsawnbeamspecimenshavingasquare

cross-sectionoffiber-reinforcedconcretearetestedinflexure

usingathird-pointloadingarrangementsimilartothatspeci-

fiedinTestMethodC78butincorporatingaclosed-loop,

servo-controlledtestingsystemandrollersupportsthatarefree

dnetdeflectionaremonitored

andrecordedtoanend-pointdeflectionofatleast

1

⁄

150

ofthe

erecordedandplottedbymeansofanX-Y

plotter,ortheyarerecordeddigitallyandsubsequentlyusedto

plotaload-defltermedfirst-peak,peak,and

residualloadsatspecifieddeflectionsareidentifiedonthe

curve,andareusedtocalculateflexuralperformanceparam-

eters.

ficanceandUse

5.1Thefirst-peakstrengthcharacterizestheflexuralbehav-

iorofthefiber-reinforcedconcreteuptotheonsetofcracking,

whileresidualstrengthsatspecifieddeflectionscharacterizethe

“ConcreteIndustrialGroundFloors—AGuidetoDesignandConstruction,”

TechnicalReport34,3

rd

edition,ConcreteSociety,Slough,UnitedKingdom,2003.

3

tus

6.1TestingMachine—Thetestingmachineshallbecapable

ofservo-controlledoperationwherethenetdeflectionofthe

centerofthebeamismeasuredandusedtocontroltherateof

increaseofdeflgmachinesthatusestrokedis-

placementcontrolorloadcontrolarenotsuitableforestab-

lishingtheportionoftheload-deflectioncurveimmediately

afterfidingandspecimensupportsystemshall

becapableofapplyingthird-pointloadingtothespecimen

fixturesspecifiedinTest

Method

C78aresuitablewiththequalificationthatsupporting

rollersshallbeabletorotateontheiraxesandshallnotbe

placedingroovesorhaveotherrestraintsthatpreventtheirfree

rotation.

6.2Deflection-MeasuringEquipment—Devicessuchas

electronictransducersorelectronicdeflectiongagesshallbe

locatedinamannerthatensuresaccuratedeterminationofthe

netdeflectionatthemid-spanexclusiveoftheeffectsofseating

eptable

Copyright by ASTM Int'l (all rights reserved); Thu Sep 20 01:51:44 EDT 2012

2

Downloaded/printed by

Washington State University pursuant to License Agreement. No further reproductions authorized.

2024年5月13日发(作者：召翠芙)

Designation:C1609/C1609M–10

StandardTestMethodfor

FlexuralPerformanceofFiber-ReinforcedConcrete(Using

BeamWithThird-PointLoading)

1

ThisstandardisissuedunderthefixeddesignationC1609/C1609M;thenumberimmediatelyfollowingthedesignationindicatesthe

yearoforiginaladoptionor,inthecaseofrevision,rinparenthesesindicatestheyearoflast

scriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.

*

1.1Thistestmethodevaluatestheflexuralperformanceof

fiber-reinforcedconcreteusingparametersderivedfromthe

load-deflectioncurveobtainedbytestingasimplysupported

beamunderthird-pointloadingusingaclosed-loop,servo-

controlledtestingsystem.

1.2Thistestmethodprovidesforthedeterminationof

first-peakandpeakloadsandthecorrespondingstresses

calculatedbyinsertingthemintheformulaformodulusof

requiresdeterminationofresidual

loadsatspecifieddeflections,thecorrespondingresidual

strengthscalculatedbyinsertingthemintheformulafor

modulusofrupturegiveninEq1(seeNote1).Itprovidesfor

determinationofspecimentoughnessbasedontheareaunder

theload-deflectioncurveuptoaprescribeddeflection(see

Note2)andthecorrespondingequivalentflexuralstrength

ratio.

N

OTE

1—Residualstrengthisnotatruestressbutanengineeringstress

computedusingsimpleengineeringbendingtheoryforlinearelastic

materialsandgross(uncracked)sectionproperties.

N

OTE

2—Specimentoughnessexpressedintermsoftheareaunderthe

load-deflectioncurveisanindicationoftheenergyabsorptioncapability

oftheparticulartestspecimen,anditsmagnitudedependsdirectlyonthe

geometryofthetestspecimenandtheloadingconfiguration.

responsibilityoftheuserofthisstandardtoestablishappro-

priatesafetyandhealthpracticesanddeterminetheapplica-

bilityofregulatorylimitationspriortouse.

ncedDocuments

2.1ASTMStandards:

2

C31/C31MPracticeforMakingandCuringConcreteTest

SpecimensintheField

C42/C42MTestMethodforObtainingandTestingDrilled

CoresandSawedBeamsofConcrete

C78TestMethodforFlexuralStrengthofConcrete(Using

SimpleBeamwithThird-PointLoading)

C125TerminologyRelatingtoConcreteandConcreteAg-

gregates

C172PracticeforSamplingFreshlyMixedConcrete

C192/C192MPracticeforMakingandCuringConcrete

TestSpecimensintheLaboratory

C823PracticeforExaminationandSamplingofHardened

ConcreteinConstructions

C1140PracticeforPreparingandTestingSpecimensfrom

ShotcreteTestPanels

ology

3.1Definitions—Thetermsusedinthistestmethodare

definedinTerminologyC125.

3.2DefinitionsofTermsSpecifictoThisStandard:

3.2.1end-pointdeflection,n—thedeflectionvalueonthe

load-deflectioncurveequalto

1

⁄

150

ofthespanlength,ora

largervalueasspecifiedattheoptionofthespecifieroftests.

3.2.2first-peakload,P

1

,n—theloadvalueatthefirstpoint

ontheload-deflectioncurvewheretheslopeiszero.

3.2.3first-peakdeflection,d

1

,n—thenetdeflectionvalueon

theload-deflectioncurveatfirst-peakload.

3.2.4first-peakstrengthf

1

,n—thestressvalueobtained

whenthefirst-peakloadisinsertedintheformulaformodulus

ofrupturegiveninEq1.

3.2.5load-deflectioncurve,n—theplotofloadversusnet

deflectionofaflexuralbeamspecimenloadedtotheend-point

deflection.

ForreferencedASTMstandards,visittheASTMwebsite,,or

contactASTMCustomerServiceatservice@ualBookofASTM

Standardsvolumeinformation,refertothestandard’sDocumentSummarypageon

theASTMwebsite.

2

1.3Thistestmethodutilizestwopreferredspecimensizes

of100by100by350mm[4by4by14in.]testedona300mm

[12in.]span,or150by150by500mm[6by6by20in.]

testedona450mm[18in.]mensizedifferent

fromthetwopreferredspecimensizesispermissible.

1.4Units—ThevaluesstatedineitherSIunitsorinch-

valuesstatedineachsystemmaynotbeexactequivalents;

therefore,eachsystemshallbeusedindependentlyoftheother.

Combiningvaluesfromthetwosystemsmayresultinnon-

conformancewiththestandard.

1.5Thisstandarddoesnotpurporttoaddressallofthe

safetyconcerns,ifany,e

ThistestmethodisunderthejurisdictionofASTMCommitteeC09on

ConcreteandConcreteAggregatesandisthedirectresponsibilityofSubcommittee

C09.42onFiber-ReinforcedConcrete.

CurrenteditionapprovedMarch1,ally

eviouseditionapprovedin2007asC1609/C1609M–07.

DOI:10.1520/C1609_C1609M-10.

1

*ASummaryofChangessectionappearsattheendofthisstandard.

Copyright©ASTMInternational,100BarrHarborDrivePOBoxC-700,WestConshohocken,Pennsylvania19428-2959,UnitedStates

Copyright by ASTM Int'l (all rights reserved); Thu Sep 20 01:51:44 EDT 2012

1

Downloaded/printed by

Washington State University pursuant to License Agreement. No further reproductions authorized.

C1609/C1609M–10

entoughnessisa

measureoftheenergyabsorptioncapacityofthetestspecimen.

Theappropriatenessofeachparameterdependsonthenature

oftheproposedapplicationandthelevelofacceptablecrack-

inganddefl-reinforcedconcreteis

influencedindifferentwaysbytheamountandtypeoffibersin

cases,fibersmayincreasetheresidual

loadandtoughnesscapacityatspecifieddeflectionswhile

producingafirst-peakstrengthequaltooronlyslightlygreater

thantheflexuralstrengthoftheconcretewithoutfi

othercases,fibersmaysignificantlyincreasethefirst-peakand

peakstrengthswhileaffectingarelativelysmallincreasein

residualloadcapacityandspecimentoughnessatspecified

deflections.

5.2Thefirst-peakstrength,peakstrength,andresidual

strengthsdeterminedbythistestmethodreflectthebehaviorof

fiber-reinforcedconcreteunderstaticfl

absolutevaluesofenergyabsorptionobtainedinthistestareof

littledirectrelevancetotheperformanceoffiber-reinforced

concretestructuressincetheydependdirectlyonthesizeand

shapeofthespecimenandtheloadingarrangement.

5.3Theresultsofthistestmethodmaybeusedforcom-

paringtheperformanceofvariousfiber-reinforcedconcrete

yalso

beusedtomonitorconcretequality,toverifycompliancewith

constructionspecifications,obtainflexuralstrengthdataon

fiber-reinforcedconcretememberssubjecttopurebending,or

toevaluatethequalityofconcreteinservice.

5.4Theresultsofthisstandardtestmethodaredependent

onthesizeofthespecimen.

N

OTE

5—Theresultsobtainedusingonesizemoldedspecimenmaynot

correspondtotheperformanceoflargerorsmallermoldedspecimens,

concreteinlargestructuralunits,

differencemayoccurbecausethedegreeofpreferentialfiberalignment

becomesmorepronouncedinmoldedspecimenscontainingfibersthatare

relativelylongcomparedwiththecross-sectionaldimensionsofthemold.

Moreover,structuralmembersofsignificantlydifferentthicknessexperi-

encedifferentmaximumcrackwidthsforagivenmid-spandeflectionwith

theresultthatfibersundergodifferentdegreesofpull-outandextension.

3.2.6netdeflection,n—thedeflectionmeasuredatmid-span

ofaflexuralbeamspecimenexclusiveofanyextraneous

effectsduetoseatingortwistingofthespecimenonits

supportsordeformationofthesupportandloadingsystem.

3.2.7peakload,P

P

,n—themaximumloadontheload-

deflectioncurve.

3.2.8peak-loaddeflection,d

P

,n—thenetdeflectionvalue

ontheload-deflectioncurveatpeakload.

3.2.9peakstrength,f

P

,n—thestressvalueobtainedwhen

thepeakloadisinsertedintheformulaformodulusofrupture

givenbyEq1.

3.2.10D—nominaldepthofthebeamspecimeninmm.

N

OTE

3—Tosimplifynomenclature,thenominalbeamdepthisshown

inunitsofmmforboththeSIandinch-poundversionofthistestmethod.

3.2.11L—spanlengthordistancebetweenthesupports.

3.2.12residualload,P

D

600

,n—theloadvaluecorrespond-

ingtoanetdeflectionofL/600forabeamofnominaldepthD.

3.2.13residualload,P

D

150

,n—theloadvaluecorresponding

toanetdeflectionofL/150forabeamofnominaldepthD.

3.2.14residualstrength,f

D

600

,n—thestressvalueobtained

D

whentheresidualloadP

600

isinsertedintheformulafor

modulusofrupturegiveninEq1.

3.2.15residualstrength,f

D

150

,n—thestressvalueobtained

D

whentheresidualloadP

150

isinsertedintheformulafor

modulusofrupturegiveninEq1.

3.2.16specimentoughness,T

D

150

,n—toughnessofbeam

specimenofnominaldepthDatanetdeflectionofL/150.

D

3.2.17equivalentflexuralstrengthratio,R

T,150

,n—the

D

valueobtainedwhenthespecimentoughnessT

150

isinsertedin

Eq3.

N

OTE

4—Theequivalentflexuralstrengthratioiscalculatedastheratio

oftheweightedequivalentloaduptoanetdeflectionofL/150overthe

fi

150

T,150

valueisequivalenttothe

R

e,3

valuedefinedintheTechnicalReportNo.34oftheConcreteSociety.

3

yofTestMethod

4.1Moldedorsawnbeamspecimenshavingasquare

cross-sectionoffiber-reinforcedconcretearetestedinflexure

usingathird-pointloadingarrangementsimilartothatspeci-

fiedinTestMethodC78butincorporatingaclosed-loop,

servo-controlledtestingsystemandrollersupportsthatarefree

dnetdeflectionaremonitored

andrecordedtoanend-pointdeflectionofatleast

1

⁄

150

ofthe

erecordedandplottedbymeansofanX-Y

plotter,ortheyarerecordeddigitallyandsubsequentlyusedto

plotaload-defltermedfirst-peak,peak,and

residualloadsatspecifieddeflectionsareidentifiedonthe

curve,andareusedtocalculateflexuralperformanceparam-

eters.

ficanceandUse

5.1Thefirst-peakstrengthcharacterizestheflexuralbehav-

iorofthefiber-reinforcedconcreteuptotheonsetofcracking,

whileresidualstrengthsatspecifieddeflectionscharacterizethe

“ConcreteIndustrialGroundFloors—AGuidetoDesignandConstruction,”

TechnicalReport34,3

rd

edition,ConcreteSociety,Slough,UnitedKingdom,2003.

3

tus

6.1TestingMachine—Thetestingmachineshallbecapable

ofservo-controlledoperationwherethenetdeflectionofthe

centerofthebeamismeasuredandusedtocontroltherateof

increaseofdeflgmachinesthatusestrokedis-

placementcontrolorloadcontrolarenotsuitableforestab-

lishingtheportionoftheload-deflectioncurveimmediately

afterfidingandspecimensupportsystemshall

becapableofapplyingthird-pointloadingtothespecimen

fixturesspecifiedinTest

Method

C78aresuitablewiththequalificationthatsupporting

rollersshallbeabletorotateontheiraxesandshallnotbe

placedingroovesorhaveotherrestraintsthatpreventtheirfree

rotation.

6.2Deflection-MeasuringEquipment—Devicessuchas

electronictransducersorelectronicdeflectiongagesshallbe

locatedinamannerthatensuresaccuratedeterminationofthe

netdeflectionatthemid-spanexclusiveoftheeffectsofseating

eptable

Copyright by ASTM Int'l (all rights reserved); Thu Sep 20 01:51:44 EDT 2012

2

Downloaded/printed by

Washington State University pursuant to License Agreement. No further reproductions authorized.