Astm c470

Designation:C470/C470M–09

StandardSpecificationfor

MoldsforFormingConcreteTestCylindersVertically

1

ThisstandardisissuedunderthefixeddesignationC470/C470M;thenumberimmediatelyfollowingthedesignationindicatestheyear oforiginaladoptionor,inthe caseofrevision,theyearoflast oflast revis oflastrevis revision.Anumberinparenthes ion.Anumberinparenthes esindicatestheyearof esindicatestheyearoflastreappro lastreapproval. Asuperscriptepsilon( ´)indicatesaneditorialchangesin )indicatesaneditorialchangesincethelastrevision cethelastrevisionorreapproval orreapproval..

C192/C192M Pr Practi acti actice ce for Mak ing ing and Cur Curing ing Con Concre cre crete te TestSpecimensintheLaboratory C1077 PracticeforLaboratoriesTestingConcreteandConcreteAggregatesforUseinConstructionandCriteriafor LaboratoryEvaluation Laboratory Evaluation D256 Te Test st Met Method hod hods s for Det Determ erm ermini ini ining ng the Izo Izod d Pen Pendul dul dulum um ImpactResistanceofPlastics D570 TestMethodforWaterAbsorptionofPlastics

1. Sco Scope* pe* 1. 1.1 1 Th This is sp spec ec ecifi ifi ificat cat catio io ion n co cove ve vers rs mo mold ld lds s fo for r us use e in fo form rm rmin in ing g cylindricalconcretespecimens.Thepr cylindricalconcretespecimens.Theprovisionsofth ovisionsofthisspecifiisspecificationincludetherequirementsforbothreusableandsingleusemolds. NOTE 1—Sizesincludedaremoldshavingdiametersfrom50mm[2 in.]to900mm[36in.].

1.2 ThevaluesstatedineitherSIunitsorinch-po undunits aretoberegardedseparatelyasstandard.Thevaluesstatedin eachsystem may not be exa exact ct equ equiva iva ivalen len lents; ts; the theref  ref ore ore, each ore, systemshallbe systemshallbe used independ independently ently ofthe other.Combini other.Combining ng valuesfromthetwosystemsmayresul valuesfromthetwosystemsmayresultin tin non-conf non-conforman ormance ce withthestandard.Theinch-poundunitsareshowninbrackets. 1.3 Thefollow Thefollowingsafetyhazard ingsafetyhazard ingsafetyhazardscaveatpertainsonlytothe scaveatpertainsonlytothe testmethoddescribedint testmethoddescribedinthisspecification hisspecification:: Thisstandarddoes no not t  pu  purp rp rpor  or t t to ad dr  dr es ess al ess all l of th the e sa fet  y co conc nc ncer ern er ns, if an y , associ associatedwithits atedwithits use.Itis therespo theresponsibili nsibili nsibilityof tyof theuserof this standardtoestablishappropriatesafetyandhealthpractices anddeterminethe anddeterminetheappli appli applicabilit  cabilit  y of reg regulato ulato ulatory ry limitat ionsprior touse. 1.4 Thetextof thisstandar thisstandardreference dreference dreferencesnotesandfootnotes snotesandfootnotes whichprovideexplanatorymaterial.Thesenotesandfootnotes (excludingthoseintablesandfigures)shallnotbeconsidered asrequirementsofthestandard.

3. GeneralRe GeneralRe ralRequirements quirements 3.1 The fol follow low lowing ing pro provis vis vision ion ions s app apply ly to bot both h reu reusab sab sable le and single-usemolds: single-use molds: 3.1.1 Moldssha Moldsshallbeconstruct llbeconstruct llbeconstructedintheformofrightcircula edintheformofrightcircula r cylind cylinderswhichstand erswhichstand withthe withthecylind cylind cylindricalaxis ricalaxis ricalaxisvertic vertic vertical al andthe to top p op open en to re recei cei ceive ve th the e co conc nc ncre re rete.They te.They sh shall all be mad ma de of materialsthatdonotreactwithconcretecontainingportlandor other other hydrauli hydraulic c cements.They cements.They shall shall bewatertightand bewatertightand suffisufficientlystrongandtoughtopermittheirusewithouttearing, crushing,ordeforming. NOTE 2—Reu 2—Reusablelidsmaybe sablelidsmaybe usedonmoldsto reducemois reducemoistureloss. tureloss.

3.1 3.1.2 .2 Mol Molds ds sha shall ll hav have e a nom nominal inal insid inside hei heightequal ghtequal to twicethenominalinsidediameter.Thediameterofamold, consistingoftheaverageoftwomeasurementstakenatright anglestoeachotheratthetopofthemold,shallnotdifferfrom thenominaldiame thenominaldiameterbymorethan1%. terbymorethan1%. Theheight,deter Theheight,deter-minedbyaveragingtwo minedbyaveragingtwomeasurementstaken measurementstaken180°apart 180°apart,shall ,shall notdif ferfrom f erfrom thenomin thenominal al hei heightby ghtby mor more e tha than n 2 2%. %. The planesofthetoprimofthemoldandthebottomshallbe per perpen pen pendic dic dicula ula ular r to the axi axis s of themold with within in 0.5degre 0.5degrees— es— 1 approximatelyequivalentto3mmin300mm[ ⁄8 in.in12in.]. Nodiameterofamoldshalldifferfromanyotherdiameterof thesamemoldbymorethan2%exceptthatmoldsthatfailto meetthisrequirementmaybeusedwhentheuserisableto demonstratethatnodiameterofhardenedconcretespecimen producedinasimilarmolddiffersfro producedinasimilarmolddiffersfromanyotherdiameteron manyotherdiameteron thesamespecimenbymorethan2%(seeNote3 thesamespecimenbymorethan2%(see Note3 Note3). ).

2. Referenc Referenced ed Docume Docume ments nts 2.1 ASTMStandards:2 C31/C31M PracticeforMakingandCuringConcreteTest SpecimensintheField C33 Specificati Specificationfor onfor ConcreteAggreg ConcreteAggregates ates 1

This specifica specification is under under the  jurisd  jurisdictio iction iction of ASTM Committe Committeee C09 on ConcreteandConcreteAggregatesandisthedirectresponsibilityofSubcommittee C09.61 onTestingforStrength. CurrenteditionapprovedOct.1,2009.PublishedNovemb CurrenteditionapprovedOct.1,2009.PublishedNovember2009.Originally er2009.Originally approvedin1961.Lastpreviousedition approvedin1961.Lastpreviouseditionapprovedin2008 approvedin2008asC470/C470M-0 asC470/C470M-08.DOI: 8.DOI: 10.1520/C0470_C0470M-09. 2 For refere referencedASTM ncedASTM ncedASTMstand stand standards,visit ards,visit theASTM theASTMwebsi websi website, te, www www.astm .astm .astm.org .org .org,, or contactASTMCustomerServiceat[email protected].For AnnualBookofASTM Standardsvolumeinformation,refertothestandard’sDocumentSummarypageon theASTMwebsite.

NOTE 3—Certainsingle-us 3—Certainsingle-use e molds mayrequire theuse of a special special dev device ice such such as a tub tube e of heavyheavy-gag gag gage e met metal al aro around und the mol mold d dur during ing moldingtomaintainthedimensionaltolerancesspecifiedin3.1.2 moldingtomaintainthedimensionaltolerancesspecifiedin 3.1.2 3.1.2..

*ASummaryofChangessectionappearsattheendofthisstandard. Copyright.(C)ASTMInt Copyright.(C)ASTMInternational.100B Copyright.(C)ASTMInternational.100BarrHarborDr.,P.O.box ernational.100BarrHarborDr. arrHarborDr.,P.O. ,P.O.boxC-700,WestC boxC-700,WestConshohockenPA. C-700,WestConshohockenPA.UnitedStates onshohockenPA.UnitedStates UnitedStates

CopyrightbyASTM CopyrightbyASTMInt'l(allrightsreserved CopyrightbyASTMInt'l(all Int'l(allrightsreserved); rightsreserved); );

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C470/C470M–09 3.1.3 Thebottominsidesurfaceofthemoldshallnotdepart fromaplanebymorethan2mmin150mm[ 1⁄16 in.in6in.] (1%ofthediameterofthemold).

5.3 Single-usePlasticMolds—Moldsshallconformtothe followingadditionalrequirementswhenplasticisthepredominantmaterialusedinconstruction: 5.3.1 WallThickness—Thesidewallsshallbeofsufficient stiffnesstomeettherequirementsof 3.1(See Note 5).

4. ReusableMolds 4.1 Reusablemoldsarethosewhicharedesignedtobeused morethanasingletime.Reusablemoldsshallbemadeof nonabsorptivematerials,andconstructedaseitheronepieceor severalpieces(seeNote4). 4.2 Reusablemoldsshallbeprovidedwithaclosureorbase onthelowerendatrightanglestotheaxisofthecylinder. Moldsmaybesinglepiecemoldsormadefromcastingswith aseparatedetachablebaseplateorabasethatisanintegralpart ofthesidewall.Themoldshallbeeithercoatedormadeofa materialthatwillpreventadherencetotheconcrete. Atthetime ofuse,moldsshallnotleakwater. Aninsidefillet,ifany,atthe bottomofthesidewallshallhaveanindentationaroundthe circumference no more than 3 mm [ 1⁄8 in.] in the vertical directionornomorethan5mm[3⁄16 in.]inthehorizontal direction. 4.3 Reusable moldsshall be testedfor water leakage as describedin6.4,forresistancetodamageasdescribedin6.3.1, andfordimensionalstabilityinaccordancewith3.1.2and3.1.3 initiallyandafterevery50usesoreverysixmonths,whichever comesfirst.

NOTE 5—Thiscanbeachievedthroughsufficientsidewallthickness alone,orincombinationwithastiffenedtop.

5.3.2 BottomDesign —Thebottomshallbedesignedsothat it will be flush with the bottom of the sidewall within a toleranceof2mm[ 1⁄16 in.].An inside fillet,if any, at the bottomofthesidewallshallhaveanindentationaroundthe circumference no more than 4 mm [ 1⁄8 in.] in the vertical directionornomorethan5mm[ 3⁄16in.]intheradialdirection. Thebottomshallbeofadequaterigiditytopreventpermanent deformationwhenspecimensaremoldedinaccordancewith the applicable provisions of Practice C31/C31M or C192/ C192M. 5.3.3 Material—The mold manufacturershallcertifythat: (1)theplasticmaterialusedinmoldshasamaximumwater absorptionoflessthan0.5%in24hwhentestedinaccordance withTest Method D570; ( 2)theplastichasanIzodimpact toughnessofatleast117J/m[2.2ftlb/in.]ofnotchfora4mm [1⁄8in.]thickspecimentestedinaccordancewithTestMethods D256;and(3)afterbeingheldat12°C[10°F]for24h,the plasticshallnotfracturewhensubjecttotapping andjarring thatisjudgedtobetypicalofwhatoccurswhenspecimensare moldedinaccordancewiththeapplicableprovisionsofPracticeC31/C31M orC192/C192M. 5.4 PaperMolds—Whenpaperor otherpotentiallyabsorptivefibermaterialisusedastheprimarystructuralmaterialin theconstructionofthesidewallsorbottomofthemold,the moldshallconformtothefollowingadditionalrequirements: 5.4.1 Side Walls—Thesidewallsofpapermoldsshallbe made with a minimum of three plies having a combined thicknessofnotlessthan2mm[0.070in.].Seamsontheinside ofthemoldshallnotbeopenbymorethan2mm[ 1⁄16 in.].

NOTE 4—Satisfactorymoldscanbemadefromlengthsofsteeltubing orpipethatisslitononesideparalleltotheaxisandfittedwithameans ofclosingtheverticalslitaswellasameansofattachingabaseplate.The requireddimensionaltolerancesmustbe maintainedafterslitting,clamping,andattachingthe baseplate.Othernonabsorptivematerialswhich havebeenusedincludeiron,brass,steel,andvariousplastics.Although aluminumandmagnesiumalloyshavebeenused,someof thesealloys maybereactivewithcementconstituentsandare thereforeunacceptable.

5. Single-UseMolds 5.1 Single-usemoldsare molds designed to be used once anddiscarded.Theyarepermittedtobemadeofsheetmetal, plastic,suitablytreatedpaperproducts,orothermaterialsand shallconformtotherequirementsofthisspecification. 5.2 PhysicalRequirements—Themoldsaspreparedforuse shallcomplywiththefollowing: 5.2.1 WaterLeakage—WhentestedasdescribedinSection 6,thereshallbenovisibleleakage. 5.2.2 Absorptivity—WhentestedasdescribedinSection 6, theabsorptionshallnotexceed thevaluesgiven in Table 1. Intermediatevaluesareproportionaltothesquareoftheheight. 5.2.3 Elongation—Whentested asdescribedinSection 6, theelongationaftertestshallnotexceed0.2%ofheight.

NOTE 6—Theminimumthicknessofmaterialusedinsidewallsand bottomsisconsideredadequateforcylindersupto150mm[6in.]in diameter.Forlargercylindersthickermaterialmayberequiredtomeet requirements of3.1.

5.4.2 BottomCaps —Thebottomcapofthemoldshallbe madeofeithermetalorpaper.Ifmetal,itshallnotbelessthan 0.23 mm [0.009 in.] in thickness and coated to prevent corrosion(Note6).Itshallbedesignedsothatitwillbeflush withthebottomedgeofthesidewallwithinatoleranceof2 mm [1⁄16 in.]andtheinsidecrimp,ifany,shallproducean indentationaroundthecircumferenceofthecylindernomore than5mm[ 3⁄16 in.]intheradial,andnomorethan4mm[ 1⁄8 in.]intheverticaldirection.Ifmadeofpaper,thebottomcap ofthemoldshallbeofparchment-linedcapstocknotlessthan 0.7mm[0.028in.]thick(Note6).Itshallbegluedtothe outsideofthewallsbymeansofaflangenotlessthan19mm [3⁄4 in.]high.Theglueshallbewater-insolubleadhesiveofthe resin type that willnot react with fresh concrete. Only the practicableminimumamountofadhesiveshallbeexposedon theinnersideofthebottomofthemold. 5.4.3 Waterproofing—Themoldmadefrompaperorfiber shallbe completelycoatedoninsideandoutside,sidewalls,

TABLE1 Limits forAbsorptionandElongation NominalMoldHeight, mm[in.] 100 150 200 300 450 600 900

[4] [6] [8] [12] [18] [24] [36]

Absorption,maxg

Elongation,max mm[in.]

2.7 6.0 11 24 54 96 216

0.2 [0.008] 0.3 [0.012] 0.4 [0.016] 0.6 [0.024] 0.9 [0.036] 1.2 [0.048] 1.8 [0.072]

CopyrightbyASTMInt'l(allrightsreserved);

2

C470/C470M–09 andbottom with a suitablewaterproofingmedium (Note7). The top edge shall be waterproofed, or coated, to limit absorption.Thesurfacesofmetalbottoms,whichmustcomply with5.4.2,neednotbecoat ed. Anywaterproofingcoatingused inthisapplicationshallhaveameltingpointnotlessthan49°C [120°F](Note8).Thecoatingshallprovideafilmoverthe insidethatwillminimizeadherenceoftheconcretetotheside wallsandthebottom.

mold,theindentationproducedintheconcretecylindershall notexceed4mm[1⁄8 in.]ineitheraradialorverticaldirection. 5.5.4 Coating—Ifthemoldismadeofmaterialwhichwill rust,corrode,react,oradhereto thefreshlymixedor hardened concrete,itmustbecoatedwithaprotectivecoatingoflacquer orothersuitablematerial. 6. TestMethodsfor Elongation,Absorption,andWater Leakage

NOTE 7—Paraffincoatingforthisusemaybeofthegradeknowntothe tradeascrudescalewaxorofanysuperiorgrade.Ingeneral,afilmof paraffinofsufficientthicknesstoaccomplishtheintendedpurposeswill permitonetoraiseacurlofparaffinwiththethumbnail. NOTE 8—Suchcoatingsmaybeunsuitableformoldsthataresubjected totemperaturesabove49°C[120°F],eitherbeforeorafterfillingwith concrete.

6.1 Apparatus —The assembly used for the absorptionelongationtestshallfollowtheprinciplesillustratedinFig.1. 6.2 Specimens—Molds shall be selected as described in Section 2.Single-usemoldsshallnotbereusednorthesame moldretested. 6.3 TestProcedureforMolds: 6.3.1 Samplesofall typesofsingle-usemoldsandreusable plastic molds shall be subjected to the dry rodded coarse aggregatetestasdescribedin6.3.2toevaluatetheirresistance todamageunderuseandtothewaterleakagetestdescribedin 6.3.3 and 6.3.4. Paper orother potentiallyabsorptivemolds shall additionally be tested for absorptivity and elongation describedin6.3.5.Plasticandsheetmetalmoldsneednotbe testedforelongationandabsorption,butshouldbetestedfor waterleakage.Dimensionalrequirementsforallmoldsshallbe verified. 6.3.2 Prepare themoldfortest byfillingwithdrycrushed stone coarse aggregate meetingthe grading requirements of SpecificationC33sizeNo.57,25.0to4.75mm[1in.toNo.4] orNo.67,19.0to4.75mm[ 3⁄4 in.toNo.4].Fillandcompact the mold by the rodding procedure specified in Practice C192/C192Mforcompressiontestspecimensusingthetampingrod, numberof layersand numberof strokes perlayer specified. It will generally not be possible to obtain the penetration of the tamping rodspecified in Practice C192/

5.5 Single-UseSheetMetalMolds—Moldsshallconformto the following additional requirements when light-gage sheet metalisthepredominantmaterialusedintheirconstruction: 5.5.1 MetalThickness —Thesidewallofsteelsheetmetal moldsshallbemanufacturedfromsheetmetalnot thinnerthan can-makingqualityblackplateandshallhaveaminimummetal thicknesscorrespondingtothatof48.5-kg[107-lb]blackplate, whichis approximately 0.300mm [0.0118 in.] thick or30 1⁄2 gage. The metalfor the bottom of the mold shallhavea minimumthicknessof0.23mm[0.009in.](Note6). 5.5.2 BottomDesign—Thebottomshallbesodesignedthat it will beflushwith the bottom ofthe side wall withina toleranceof2mm[ 1⁄16 in.].Aninsidecrimp,ifused,shall produceanindentationaroundthecircumferenceofthecylindernomorethan4mm[ 1⁄8 in.]intheverticalor5mm[ 3⁄16 in.]intheradialdirection. 5.5.3 Top Edge—Thetopedgeofthesidewallshallbe curledorbeadedtostrengthenthemoldandprotecttheuser fromsharpedges.Ifsuchbeadprotrudestotheinsideofthe

FIG.1ApparatusforAbsorption-ElongationTestofPaperMolds CopyrightbyASTMInt'l(allrightsreserved);

3

C470/C470M–09

C192M. After rodding the final layer, empty the coarse aggregate,wipelightlywithadryclothandexaminethemold forphysicaldamage. 6.3.3 Aftercompletionof6.3.2,determine the massof the moldandrecordtothenearest0.004g/mm[0.1g/in.]ofmold height.Placethemoldonafirm,flatsurfaceandfillwithwater atroomtemperaturetoadepthof90to95%ofthemold height.Thenplacethemoldonthedialstand,coverwiththe glass or metal plate and record the initial length by dial micrometertothenearest0.025mm[0.001in.]. 6.3.4 Allow the mold to stand for 3 h and take a final reading of the micrometer. Examine and record any visible leakage.Emptywaterfromthemold,drylightlywithatowel andrecordthefinalmasstothenearest0.04g/cm[0.1g/in.]of moldheight. 6.3.5 Calculatethe elongationasthedifferencebetweenthe finallengthandinitiallength.Calculatetheabsorptionasthe differencebetweenthefinalmassandinitialmassofthemold. 6.3.6 Verifyall dimensionalrequirements. 6.4 WaterLeakageTestforReusableMolds: 6.4.1 Preparereusablemoldswith thesealanttobe used,if required.Fillmoldswithwatertoadepthof90to95%ofthe nominalheight.Subjectthemoldtotappingandjarringwhich isjudgedtobetypicalofwhatoccurswhenspecimensare moldedinaccordancewiththeapplicableprovisionsofPracticeC31/C31M or C192/C192M. 6.4.2 Onehourafter tapping,examineforvisible leakage.

8. Recordto bePreparedby thePurchaser 8.1 Whereapplicableforthetypeofmoldtested,recordand retaininaccordancewithPracticeC1077thefollowinginformationforeachmoldtested: 8.1.1 Brandorsourceofmolds, 8.1.2 Shipmentorlotfromwhichthemoldwastaken, 8.1.3 Datesampledanddatetested, 8.1.4 Briefgeneraldescriptionofthemoldincludingnominaldimensions,type of mold, andmaterialsof which it is made, 8.1.5 Totalabsorption,g,if specified, 8.1.6 Totalexpansion,mm [in.],ifspecified, and 8.1.7 Water leakage reported in terms of compliance, or failurebyleakage. 8.2 Whereapplicableforthetypeofmoldtested,recordand retainthefollowinginformationforsampleswhichdonotmeet therequirementsofthespecification: 8.2.1 Averagediameter or height,mm [in.], 8.2.2 Maximum andminimum diameters or heights, mm [in.], 8.2.3 Nonconformance with required perpendicularity of rimorbasetotheaxisofthemold, 8.2.4 Apparentreaction betweenmold materialsand concreteormortarorcorrosionofmetalincontactwithconcrete, 8.2.5 Meltingpointlessthan49°C[120°F], 8.2.6 Minimum thickness of materials in side walls or bottom,and 8.2.7 Dimensionof crimpin bottom,top edgeor constructionofpaperbottom.

7. Samplingand Rejection 7.1 At least three single-use andreusablemolds shall be selectedatrandomfromeachshipmentbythepurchaserto ensurethatthemoldsarein compliancewiththisspecification. 7.2 Failureofanyoneofthethreemold stocomplywiththis specificationshallbebasisforrejectionoftheshipment.

9. Keywords 9.1 concrete;molds; testcylinders

SUMMARYOFCHANGES Committee C09 hasidentified thelocation of selectedchanges to this specification since the last issue, C470/C470M–08,thatmayimpacttheuseofthisspecification.(ApprovedOctober1,2009) (1)Revised4.3torequireinitialcompliancetestingofreusable moldsbeforebeingplacedinservice.

(2)Replaced“report”with“recordandretain”inSection 8. (3)AddedPractice C1077 to8.1 and Referenced Documents.

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