1、BRITISH STANDARD BS EN 13892-8:2002 Methods of test for screed materials Part 8: Determination of bond strength The European Standard EN 13892-8:2002 has the status of a British Standard ICS 91.100.10 BS EN 13892-8:2002 This British Standard, having been prepared under the direction of the Building
2、and Civil Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 28 November 2002 BSI 28 November 2002 ISBN 0 580 40877 9 National foreword This British Standard is the official English language version of EN 13892-8:2002
3、. The UK participation in its preparation was entrusted by Technical Committee B/544, Plastering, rendering, dry lining, screeds and in situ floorings, to Subcommittee B/544/6, Screeds and in situ floorings, which has the responsibility to: A list of organizations represented on this subcommittee ca
4、n be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search”
5、facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obliga
6、tions. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of
7、 pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPE
8、NNE EUROPISCHENORM EN138928 November2002 ICS91.100.10 Englishversion MethodsoftestforscreedmaterialsPart8:Determinationof bondstrength MthodesdessaisdesmatriauxpourchapesPartie8: Dterminationdelaforcedadhrence PrfverfahrenfrEstrichmrtelundEstrichmassenTeil8: BestimmungderHaftzugfestigkeit ThisEurope
9、anStandardwasapprovedbyCENon9October2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedo
10、napplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmem
11、bersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNOR
12、MUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN138928:2002EEN138928:2002(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Principle4 4 Symbolsandabbreviations . .4 5 Apparatusa
13、ndmaterial .4 6 Procedure .5 7 Expressionofresults . .6 8 TestReport . 6EN138928:2002(E) 3 Foreword Thisdocument(EN138928:2002)hasbeenpreparedbyTechnicalCommitteeCEN/TC303,“Floorscreedsand insituflooringsinbuildings“,thesecretariatofwhichisheldbyDIN. ItwaspreparedbyWorkingGroup2“Screedmaterialsandfl
14、oorscreedsTestmethods”takingintoaccountthe proposalssubmittedbyWorkingGroup1“ScreedmaterialsandfloorscreedsDefinitions,propertiesand requirements”. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyMay2003,andconflictingnat
15、ionalstandardsshallbewithdrawnatthelatestby May2003. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Mal
16、ta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom.EN138928:2002(E) 4 1Scope ThisEuropeanStandardspecifiesamethodfordeterminingthebondstrengthbetw eenascreedandasta ndard substrateforspecimensmadefromcementitiousscreed,calciumsulphatescreed,magnesitescreedand syntheticresins
17、creedmaterial. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublica
18、tionsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN1766:2000,ProductsandsystemsfortheprotectionandrepairofconcretestructuresTestmethods Referenceconcretesfortesting. EN13813 ,Sc
19、reedmaterialandfloorscreedsScreedmaterialPropertiesandrequirements. EN138921 ,TestmethodsforscreedmaterialsPart1:Sampling,makingandcuringspecimensfortest. EN24624:1992,PaintsandvarnishesPullofftest(ISO4624:1978). 3Principle Thebondstrengthisdeterminedasthefailuretensilestressappliedbyadirectloadperp
20、endiculartothebond area.Thebondstrengthiscalculatedasthequotientbetweenthefailureloadandthetestarea.Thetestareais definedbycoringorcuttingthroughthescreedintothesubstrate. 4 Symbolsandabbreviations F isthefailureloadinN; A isthetestareainmm 2 ; B isthebondstrengthinN/mm 2 . 5 Apparatusandmaterial Te
21、stspecimen,ofminimumdimensions300mmx300mmx50mm,withareproduciblesurfacetexture,madeof concreteaccordingtoEN1766oftypeMC(040)withmaximumaggregatesize10mm,water/cementratio0,40 andcementcontent455kg/m 3 ; SteelPullheadplates, ofcircularcrosssectionwithadiameterof(50 0,5)mmorofasquarecrosssectionwith a
22、sideof(50 0,5)mm.Andathicknessofatleast20mm.Onthesideonwhichtheadhesiveistobeapplied,the pullheadplateshallbecleanandflatwithatoleranceof0,1mmper50mmlength.ItshallbeprovidedwithaEN138928:2002(E) 5 meansforattachingthepullofftestequipmentensuringnormalapplicationoftheloadonthesurfaceundertest, withou
23、ttheoccurrenceofbendingorshearforcesonthetestarea. Resinbasedadhesive,e.g.epoxyresinormethylmethacrylateresin. Coredrillingdeviceandbarrel thatenablethedrillingofa(50 1,0)mmcylinderthroughthescreed.Thecore barrelshouldhaveacuttingedgethatstandsproudofthecylinderby(1,5 0,5)mm(toreducelateralforcesbei
24、ng appliedonthetestarea). Diamondsawingmachine thatenablesacrosscutthroughthescreed. Pullofftestequipment complyingwithEN24624withapullingcapacitysufficienttocausetensilebondfailureof thespecimen.Theaccuracyshallbewithin 2%(acapacityof10kNissufficientformostapplications).Thepull offequipmentshallbec
25、apableofapplyingtheloadaccordingto3.1ofEN24624:1992andshallbeprovidedwitha measurementdevicethatdisplaystheexertedforcebyananalogueordigitalsystem.Themeasurementdevice shallretainthereadingofmaximumforceexerted. 6Procedure Samplingofscreedmaterialandpreparationandcuringoftestspecimensshallfollowthem
26、ethodinEN138921.If abondingagentisprescribedbythemanufacturer,itshallbeappliedtothesurfaceoftheconcretetestspecimens. Thethicknessofthescreedshallbewithintherangedeclaredbythemanufacturer. Eitherthesquareorthecircularpullheadplatesshallbeused.Thesquarepullheadplatesarepreferredwhere thescreedisgreat
27、erthan20mminthickness. Aminimumof5testareasofapproximately50mmcrosssectionshallbecoredorcutthroughthescreedmaterial orthefloorscreed.Thetestareasshallbeatleast50mmapartfromeachotherandatleast50mmawayfromthe edgeofthetestspecimens.Thedimensionsofeachtestareashallbemeasuredtothenearest0,5mm.Thetest ar
28、eashallbecalculatedandtheresultrecorded. Afterstorage,testspecimensshallbecutorcoredusingacoredrillingmachineorasaw,asappropriate.The cuttingshallextendthroughthescreedtoadepthofmorethan5mmintothesubstrate.Watercoolingshouldbe avoided,especiallyforcalciumsulphateandmagnesitescreeds.Ifwatercoolingisu
29、navoidable,thecuttingor coringshouldbedoneatleastonedaybeforethetensiletesting.Damagedspecimensshallberejected. Thepullheadplatesshallbebondedcentrallyonthetestareaswiththeadhesive,preventinganyexcessadhesive frombridgingthecutaroundthetestareas. Thetensileloadshallbeappliedperpendiculartothetestare
30、athroughthepullheadplates.Theloadshallbe appliedwithoutshockandatauniformrateof0,05 0,01N/(mm 2 s).Thefailureloadshallberecorded.Anytest shallberejectedwherethemodeoffailureisfractureattheadhesivelayerbetweenthepullheadplateandthe screedandtheachievedvalueislowerthanthedesignatedvalue.EN138928:2002(
31、E) 6 7 Expressionofresults Theindividualbond( B)strengthshallbecalculatedfromthefollowingformula: A F B= Thebondstrengthshallbecalculatedasthemeanvaluefromthe5individualvaluestothenearest0,1N/mm 2 . Fromavisualassessment,thetypeoffailureofthespecimenshallbedetermined.Typesoffailureareasfollows: X =
32、Cohesivefailureintheconcretesubstrate X/Y = Failurebetweenthesubstrateandthescreed Y = Cohesivefailureinthescreed Z = Failurebetweentheadhesivelayerandthepullheadplate Ifthereisacombinationofthesetypesoffailure,avisualinspectionshallbemadeofthefailurefacetoestimate thepercentageofeachtypeoffailure,b
33、asedonthesurfacearea,forexample: X:X/Y:Y=40%:10%:50%. Wherethescreedsystemcomprisesmorethan1layerofmaterialthelocationoffailure,ifoccurringbetweenthe layers,shallberecorded. 8 TestReport Thetestreportshallincludethefollowinginformation: a) number,titleanddateofissueofthisEuropeanStandard; b) nameand
34、addressofthelaboratorycarryingoutthetestsandnameandaddressofthelaboratorypreparingthe samples(ifdifferent); c) identificationnumberofthetestreport; d) nameandaddressofthemanufacturerorsupplieroftheproduct; e) nameandidentificationmarksorbatchnumberoftheproduct; f) dateofsupplyoftheproduct; g) method
35、ofsampling(byreferencetoEN138921)andbywhichorganisation; h) place,dateandtimeofsampling; i) identificationofthescreedsamples,includingtype,originanddesignationofthescreedmaterialbyreferenceto therelevantproductstandardEN13813; j) preparation(mixing,casting)andstorage(curing)conditionsbyreferencetoEN
36、138921; k) dateandtimeofpreparingsamplesfortest(i.e.dateandtimeofanymixing,casting,mouldingordemoulding procedure,preparationofthesubstrate,useofthebondingagent,ifappropriate); l) ageofscreedmaterialwhentested;EN138928:2002(E) 7 m) densityofeachindividualtestsample; n) testmethodused(referencemanual
37、oralternativemethod,ifappropriate),anddetailsoftestspecimens includingnumber,dimensions,mass,etc.ifappropriate; o) dateoftestandtheidentificationnumberoftheapparatusordetailsofthetestequipmentused,includingthe make,typeandcapacityandthecalibrationsdetails; p) testresults(individualvaluestothenearest
38、0,1N/mm 2 ,andcorrespondingmeanvaluestatedtothenearest0,1 N/mm 2 ); q) remarks; r) dateoftestreportandsignature.BS EN 13892-8:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents
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