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
已閱讀1頁，還剩8頁未讀， 繼續(xù)免費閱讀

下載本文檔

版權(quán)說明：本文檔由用戶提供并上傳，收益歸屬內(nèi)容提供方，若內(nèi)容存在侵權(quán)，請進(jìn)行舉報或認(rèn)領(lǐng)

文檔簡介

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

溫馨提示

  • 1. 本站所有資源如無特殊說明，都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請下載最新的WinRAR軟件解壓。
  • 2. 本站的文檔不包含任何第三方提供的附件圖紙等，如果需要附件，請聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
  • 3. 本站RAR壓縮包中若帶圖紙，網(wǎng)頁內(nèi)容里面會有圖紙預(yù)覽，若沒有圖紙預(yù)覽就沒有圖紙。
  • 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
  • 5. 眾賞文庫僅提供信息存儲空間，僅對用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理，對用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯，并不能對任何下載內(nèi)容負(fù)責(zé)。
  • 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容，請與我們聯(lián)系，我們立即糾正。
  • 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時也不承擔(dān)用戶因使用這些下載資源對自己和他人造成任何形式的傷害或損失。

評論

0/150

提交評論