2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、Designation:D7234?12StardTestMethodfPullOffAdhesionStrengthofCoatingsonConcreteUsingPtablePullOffAdhesionTesters1ThisstardisissuedunderthefixeddesignationD7234thenumberimmediatelyfollowingthedesignationindicatestheyearof

2、iginaladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thistestmethodcoversproceduresfe

3、valuatingthepulloffadhesionstrengthofacoatingonconcrete.Thetestdeterminesthegreatestperpendicularfce(intension)thatasurfaceareacanbearbefeaplugofmaterialisdetached.Failurewilloccuralongtheweakestplanewithinthesystemcompr

4、isedofthetestfixtureadhesivecoatingsystemsubstratewillbeexposedbythefracturesurface.1.2Thistestmethodusesaclassofapparatusknownasptablepulloffadhesiontesters.2Theyarecapableofapplyingaconcentricloadcounterloadtoasinglesu

5、rfacesothatcoatingscanbetestedeventhoughonlyonesideisaccessible.Measurementsarelimitedbythestrengthofadhesionbondsbetweentheloadingfixturecoatingsystemthesubstratethecohesivestrengthsoftheadhesivecoatinglayerssubstrate.1

6、.3Pulloffadhesionstrengthmeasurementsdependuponbothmaterialinstrumentalparameters.Therearedifferentinstrumentsusedthatcomplywiththistestmethod.Thespecificinstrumentusedshouldbeidentifiedwhenreptingresults.Thistestisdestr

7、uctivespotrepairsmaybenecessary.1.4ThevaluesstatedinSIunitsaretoberegardedasthestard.Thevaluesgiveninparenthesesarefinfmationonly.1.5Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itisthere

8、sponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:3C1583TestMethodfTensileStrengthofConcreteSurfacestheBo

9、ndStrengthTensileStrengthofConcreteRepairOverlayMaterialsbyDirectTension(PulloffMethod)D16TerminologyfPaintRelatedCoatingsMaterialsApplicationsD2651GuidefPreparationofMetalSurfacesfAdhesiveBondingD3933GuidefPreparationof

10、AluminumSurfacesfStructuralAdhesivesBonding(PhosphicAcidAnodizing)D4541TestMethodfPullOffStrengthofCoatingsUsingPtableAdhesionTestersE177PracticefUseoftheTermsPrecisionBiasinASTMTestMethodsE178PracticefDealingWithOutlyin

11、gObservationsE691PracticefConductinganInterlabatyStudytoDeterminethePrecisionofaTestMethod3.Terminology3.1ThetermsdefinitionsinTerminologyD16applytothistestmethod.3.2Definitions:3.2.1adhesiven—(withrespecttothistestmetho

12、d)adhesivereferstothematerialthatbondsthebottomoftheloadingfixturetothetopsurfaceofthecoatingtobetested.3.2.2loadingfixturen—(alsoreferredtoasdolliesstuds)ametalstructurethatisflatononeendfbondingtothecoatingsurfaceshape

13、dontheotherendfattachmenttotheadhesiontesterisusedtodeterminethepulloffadhesionstrengthofcoatings.3.2.3ptablepulloffadhesiontestersn—instrumentsthatarecapableofapplyingaconcentricloadcounterloadto1Thistestmethodisunderth

14、ejurisdictionofASTMCommitteeD01onPaintRelatedCoatingsMaterialsApplicationsisthedirectresponsibilityofSubcommitteeD01.46onIndustrialProtectiveCoatings.CurrenteditionapprovedJuly12012.PublishedOctober2012.iginallyapprovedi

15、n2005.Lastpreviouseditionapprovedin2005asD7234–05.DOI:10.1520D723412.2Thetermadhesiontestermaybesomewhatofamisnomerbutitsadoptionbytwomanufacturersatleasttwopatentsindicatescontinuedusage.3FreferencedASTMstardsvisittheAS

16、TMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.U

17、nitedStates1fixture.Atleastthreereplicationsarerequiredindertostatisticallyacterizethetestarea.7.1.2Theedtestareasmustalsohaveenoughperpendicularradialclearancetoaccommodatetheapparatusbeflatenoughtopermitalignment.Itsho

18、uldbenotedthatmeasurementsclosetoanedgemaynotberepresentativeofthecoatingasawhole.7.2Scingthecoatingdowntothesurfaceofthesubstrateisrequiredfallcoatingsthickerthan0.5mm(20mils)fallreinfcedelastomericcoatings.Whilescingis

19、recommendedfcoatingsthinnerthan0.5mm(20mils)thetestmaybeperfmedwithoutscingbuttheresultsshouldnotethisexception.Scingshallbeperfmedinamannerthatensuresthecutismadenmaltothecoatingsurfaceinamannerthatdoesnottwisttquethete

20、stareaminimizesheatgeneratededgedamagemicrocrackstothecoatingtheconcretesubstrate.Fthickcoatingsitisrecommendedtocoolthecoatingsubstrateduringthecuttingprocesswithwaterlubrication.Whenusingaroundloadingfixturescingisperf

21、medbefetheloadingfixtureisattached(seeFig.1).Whenusingsquarerectangularloadingfixturesscingistypicallyperfmedaftertheloadingfixtureisattached(seeFig.2).7.3Cleanthesurfacesinamannerthatwillnotaffectintegrityofthecoatingle

22、avearesidue.Cleantheloadingfixturesurfaceasindicatedbytheapparatusmanufacturer.FailuresatthefixtureadhesiveinterfacecanoftenbeavoidedbytreatingthefixturesurfacesinaccdancewithanappropriateASTMstardpracticefpreparingmetal

23、surfacesfadhesivebonding.Fingerprintsmoistureoxidestendtobetheprimarycontaminants.NOTE1—GuidesD2651D3933aretypicalofwellprovenmethodsfimprovingadhesivebondstrengthstometalsurfaces.7.4Preparetheadhesiveinaccdancewiththead

24、hesivemanufacturer’srecommendations.Applytheadhesivetothefixturethesurfacetobetestedbothusingamethodrecommendedbytheadhesivemanufacturer.Becertaintoapplytheadhesiveacrosstheentiresurface.Positionfixtureonthesurfacetobete

25、stedcentereddirectlyoverthescedsectionwiththefixtureoutersideslinedupwiththeinsidecircumferenceofthescedsection.Carefullyremovetheexcessadhesivefromaroundthefixture.(Warning—Movementespeciallytwistingcancausetinybubblest

26、ocoalesceintolargeholidaysthatconstitutestressdiscontinuitiesduringtesting.)NOTE2—Addingabout1percentof#5glassbeadstotheadhesiveassistsinevenalignmentofthetestfixturetothesurface.7.5Basedontheadhesivemanufacturer’srecomm

27、endationstheanticipatedenvironmentalconditionsallowenoughtimeftheadhesivetosetupreachtherecommendedcure.Duringtheadhesivesetearlycurestageaconstantcontactpressureshouldbemaintainedonthefixture.Mechanicalclampingsystemswk

28、wellbutsystemsrelyingontacksuchasmaskingtapeshouldbeusedwithcaretoensurethattheydonotrelaxwithtimeallowairtointrudebetweenthefixturethetestarea.FIG.1ScingAroundtheLoadingFixturePritoAttachmentoftheFixture(RoundLoadingFix

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