CEN TR 14734-2004 Durability of wood and wood-based products - Determination of treatability of timber species to be impregnated with wood preservatives - Laboratory method《木材和派生材料.pdf

1、PUBLISHED DOCUMENT PD CEN/TR 14734:2004 Durability of wood and wood-based products Determination of treatability of timber species to be impregnated with wood preservatives Laboratory method ICS 79.040 PD CEN/TR 14734:2004 This Published Document was published under the authority of the Standards Po

2、licy and Strategy Committee on 18 March 2004 BSI 18 March 2004 ISBN 0 580 43573 3 National foreword This Published Document is the official English language version of CEN/TR 14734:2004. The UK participation in its preparation was entrusted by Technical Committee B/515, Wood preservation, to Subcomm

3、ittee B/515/2, Specifications and chemical testing of wood preservatives, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred

4、to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions

5、 of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or p

6、roposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the CEN/TR title page, pages 2 to 16, an inside back cover and a back cover.

7、The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsTECHNICALREPORT RAPPORTTECHNIQUE TECHNISCHERBERICHT CEN/TR14734 February2004 ICS79.040 Englishversion DurabilityofwoodandwoodbasedproductsDetermi

8、nationof treatabilityoftimberspeciestobeimpregnatedwithwood preservativesLaboratorymethod Durabilitduboisetdesmatriauxdrivsdubois Dterminationdelimprgnabilitdessencesdeboispar desproduitsdeprservationMthodedelaboratoire DauerhaftigkeitvonHolzundHolzwerkstoffen LaboratoriumsverfahrenzurBestimmungderT

9、rnkbarkeit vonHolzarten,diemitHolzschutzmittelnimprgniert werdensollen ThisTechnicalReportwasapprovedbyCENon3November2003.IthasbeendrawnupbytheTechnicalCommitteeCEN/TC38. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hung

10、ary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2004

11、CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.CEN/TR14734:2004:ECEN/TR14734:2004(E) 2 Contents Page 1 Scope . 5 2 Principle. 5 3 Reagents 5 4 Apparatus 5 5 Testspecimens . 6 6 Procedure 7 7 Datahandling . . 9 8 Testreport . 11 AnnexAGuidanceonsampli

12、ng. 12 AnnexBExampleofatestreport . . 14 Bibliography . 16CEN/TR14734:2004(E) 3 Foreword Thisdocument(CEN/TR14734:2004)hasbeenpreparedbyTechnicalCommitteeCEN/TC98“Durabilityofwood andwoodbasedproducts”, thesecretariatofwhichisheldbyAFNOR. ThestatusofthisdocumentasaTechnicalReporthasbeenchosenbecause

13、themethodisusefulbutshouldbe confirmedbyexperimentation. ThisdocumentincludesaBibliography.CEN/TR14734:2004(E) 4 Introduction ThebasisforthisdocumentwaspreparedasbeingpartoftheworkforSMTprojectMATCT94061project number 3307:ImprovementofCENstandardsbyshorttermmethodsfortestingthenaturaldurabilityand

14、treatabilityofsolidwoodandwoodbasedpanelproducts. Itprovidesthemeanswherebythetreatabilityofsapwoodorheartwoodofdifferentwoodspeciescanbe determinedinordertodeterminelikelyreactiontoimpregnationwithwoodpreservatives.Suchanassessment providesdataforuseinEN3511whichestablishesasystemforspecifyingthetr

15、eatmentofwoodwithwood preservativesbaseduponthepenetrationandretentionofpreservativesachievedbythetreatmentprocess. EN3511recognisesthatdifferentwoodspeciesrespondtotreatmentdifferentlydependingontheirabilityto absorbpreservative,andrequiresadifferentlevelofcompliancedependingonthetreatabilityofthew

16、ood concerned.WhileEN3502includesasubjectiveclassificationofthetreatabilityofdifferentwoodspeciesusinga fourclasssystem,themethoddescribedinthisdocumentprovidesthemeanstodeterminethetreatability objectively. Althoughthemethoddescribedusesanaqueoussolutionastheimpregnatingliquid,theresultscanbeusedto

17、 giveguidanceonthetreatabilityofthesamplesundertest.Alternatively,themethodcanbemodifiedusingother preservativetypes,egorganicsolventoremulsionpreparations,iftheresponseofthewoodtoaspecific preservativeisrequired.However,itshouldbenotedthatthemethoddoesnottakeaccountofpreservative formulationswheret

18、heactiveingredientsareselectivelyadsorbedontothewoodsubstrateresultinginthesolvent penetratingmoredeeplythanthebiocides.CEN/TR14734:2004(E) 5 1Scope ThisTechnicalReportdescribesalaboratorymethodforthedeterminationofthetreatabilityofwoodinorderto determinethelikelyreactionofdifferentwoodspeciestoimpr

19、egnationwithwoodpreservatives.Itcanalsobeused toinvestigatevariationbetweensamplesofthesamespeciesbutofdifferentorigin. 2Principle Aftermoistureanddensitydeterminationofeachoftestspecimens,asetoftestspecimensisimpregnatedwith coppersulfatesolutioninaccordancewithastandardtestprocedure.Afterapplicati

20、onofanindicatorsolutionto theexposedcrosssectionandtooneoftheexposedlongitudinalsurfacesofeachoftestspecimens,thelateral andaxialpenetrationismeasuredandthetreatabilityclassisevaluated. 3Reagents 3.1 Coppersulfatepentahydrate,solution,massfractionof5%. Dissolve50gofcoppersulfatepentahydrate(CuSO 4 .

21、 5H 2 O)in950gwater. NOTE Thevolumeofcoppersulfatesolutionrequiredwilldependonthecapacityoftheimpregnationapparatus. 3.2 Indicatorsolution Fortheindicationofthepenetrationanindicatorsolution,e.g.chromeazurolS,canbeused.Dissolve0,5g chromeazurolSand5gsodiumacetatein100mlwater. NOTE Otherindicatorscan

22、beused. 3.3 Sealingcompound Asealingcompoundwhichisinerttothecoppersulfatesolution(3.1)andunaffectedbythetestconditions. 4Apparatus Ordinarylaboratoryapparatusand: 4.1 Balance,capableofweighingtoanaccuracyof0,01g. 4.2 Conditioningchamber ,wellventilatedandcontrolledat(20 2)Cand(65 5)%relativehumidit

23、y. 4.3 Measuringdevice ,capableofmeasuringthedimensionsoftestsamplesofupto40mminsizeandtoan accuracyof0,1mm. 4.4 Dryingoven ,capableofbeingcontrolledat(103 2)C. 4.5 Desiccator,withefficientdesiccant(silicagelforexample).CEN/TR14734:2004(E) 6 4.6 Impregnationapparatus,consistingofachamberandheadertan

24、kwithancillaryvacuumandpressure pumpscapableofexertingavacuumof(1 0,5)kPa 1) andapressureof9,0 10 2 kPa.Thepipeworkbetween thechamberandthepumpsshallbedesignedsothataddingordrainingtreatmentsolutionscanbeachievedwhile maintainingtheexistingpressureinthevessel.AtypicalapparatusisshowninFigure1. Key 1

25、 Headertank 2P u m p 3 Vacuumpump 4 Chamber Figure1Typicalimpregnationapparatus 5 Testspecimens 5.1Preparation Prepareaminimumoftentestspecimens,eachfromadifferentplankofthewoodspeciesundertest(seealso 6.2).Thetestspecimensofheartwoodandsapwoodshallbeidentifiedandmarkedappropriately.Thewoodshall bes

26、ound,straightgrainedandwithoutknotsandthevisiblefeaturesofthewoodshallbegivenforexample:resin pockets,crossgrain,widthsofannualringsandproportionoflatewood.Atthetimeoftest,themoisturecontentof thetestspecimensshallbebetween13%and18%. NOTE1 GuidanceonsamplingofwoodisgiveninannexA. NOTE2 Woodcondition

27、edtoconstantmassinachamber(4.2)at65%relativehumidityand20Cwillattainamoisture contentof10%( m/m)to14%( m/m). Fromeachplank,prepareastriphavingalengthofatleast800 mmandacrosssectionof (40 0,3)x(40 0,3)mm.Thelateralsurfacesshallbeplanedandshallbetrueradialandtangentialsurfaces. Crosscut15mmto20mmfromo

28、neendanddiscard.Crosscuta(10 0,1)mmlongsamplefromthesameend, formoisturecontentanddensitydetermination(see6.1).Trimtheotherendoftheremaininglengthtogiveatest specimen(750 1)mmlongforimpregnation.Numberbothtestspecimenssoastoretaintheidentityoftheplank. Applythesealingcompound(3.3)toonecrosssectionen

29、dofeachtestspecimenforimpregnationandallowto set. 1) 1kPa=10mbar.CEN/TR14734:2004(E) 7 6Procedure 6.1 Moisturecontentanddensitydetermination Weigheachtestspecimenformoisturecontentdeterminationtothenearest0,01gusingthebalance(4.1),to determinetheinitialmass( m 0 ).Transferthetestspecimenstothedrying

30、oven(4.4).Drythetestspecimensfor 18hto24h,cooltoroomtemperatureinadesiccator(4.5),weigheachtestspecimentothenearest0,01gand recordthefinalmass( m 1 ).Calculatethemoisturecontentofeachtestspecimenbyexpressingthewatercontent (m 0 m 1 )asapercentageofthedrymass( m 1 ).Calculatethedensityofeachtestspeci

31、men,expressedas kilogramspercubicmetre,usingtheovendrymass( m 1 )andthenominalvolumeof16cm 3 . 6.2 Impregnationoftestspecimens(standardprocedure) Placethetestspecimensintheimpregnationchamber(4.6)insuchawaythattheydonottoucheachotherand thattheydonotfloatwhenthechamberisfilledwiththecoppersulfatesol

32、ution(3.1). NOTE1 Asuitablearrangementcanbeachievedbyseparatingthestackedtestspecimenswithsmallsticksandeithertying downthetestspecimensorplacingweightsonthetopofthestack. Sealthechamberandbymeansofthevacuumpump,reducethepressureto(1,0 0,5)kPa.Maintainthis vacuumfor45min.Then,withthevacuumpumprunnin

33、g,introducethecoppersulfatesolution(3.1)sothatthe impregnationchamberandtheheadertankarecompletelyfilled.Releasethevacuumsothatthepressureinthe apparatusreturnstoatmosphericpressure.Applyapressureof(9,0 0,5) 10 2 kPaandmaintainfor120min. Releasethepressuresothattheapparatusreturnstoatmosphericpressu

34、re.Drainthecoppersulfatesolutionfrom thechamber. Removethetestspecimensfromthechamberandstackinawellventilatedareatoallowdryingtotakeplace. Allowtodryuntilthemoisturecontentofthetestspecimensisbelowthefibresaturationpoint. NOTE2 Amoisturemeterofthetwoprongedelectricalconductivitytypeissuitableforthi

35、spurpose. 6.3 Measurementofpenetration CuteachtestspecimenaccordingtothepatterngiveninFigure2,usingequipmentwhichprovidesafinesawn finish. NOTE Thecuttingshouldbeintheradialplanandshouldbefromtheendthatwasnearesttheendseal.CEN/TR14734:2004(E) 8 Dimensionsinmillimetres Key 1 Endsealedcrosssection Fig

36、ure2Cuttingofthesamples Applytheindicatorsolution(3.2)totheexposedcrosssection(seeFigure2)ofeachtestspecimenusingeithera spraytechniqueorapaintbrush.Similarlyapplythereagenttooneoftheexposedlongitudinalsurfaces(see Figure2)ofeachtestspecimen. NOTE Thewoodpenetratedbythecoppersulfatesolutionwillbecom

37、edeepblueifchromeazurolSisused:the remainderwillbecolouredred. Whenthereagenthasdriedenoughforthespecimenstobehandled,measure(i)theminimumandaveragelateral penetrationand(ii)theminimumaxialpenetrationofthecoppersulfatesolutionintothetestspecimens. Measurethelateralpenetrationatthecentreandapproximat

38、ely10mmeithersideofthecentreofeachradialand tangentialedgeoftheexposedcrosssection(seeFigure3).Ifthepenetrationdoesnotexceed10mmatany point,calculatethemeanofallthevaluesandrecordastheaveragelateralpenetration.Ifthepenetrationexceeds 10mmatanypoint,calculatetheaveragelateralpenetrationusingonlythere

39、adingstakenatthecentreofeach edgeandindicatethemethodofcalculationinthetestreport.Additionally,measuretheminimumpenetration achievedatanypointonthecrosssection. Measuretheminimumaxialpenetrationwhichisthedistancefromtheunsealedendtowhichthecoppersulfate solutionhaspenetratedacrossthecompletewidthoft

40、heexposedsurface(dinFigure4).CEN/TR14734:2004(E) 9 Figure3Measuringpointsoflateralpenetrationoncrosssection Figure4Assessmentofaxialpenetrationonlongitudinalplane 7 Datahandling 7.1Treatability classes Thetreatabilityofthewoodspeciesundertestshallbeevaluatedaccordingtoafourclasssystemasdefinedin Tab

41、le1. Themeasurementsofpenetrationtakenfromthetestspecimensshallbeusedtodeterminewhetherthewood belongstoclass1,class2,orwhetheritbelongstooneofclasses3and4.CEN/TR14734:2004(E) 10 Table1Treatabilityclasses Impregnation procedure Minimumlateral penetration Averagelateral penetration Minimumaxial penet

42、ration Treatabilityclass Standard 15mm nr nr 1 Standard 3mm 6mm 300mm 2+ a Standard 3mm 6mm 300mm 2 Extralong b 1mm nr 300mm 3+ a Extralong b 1mm nr 300mm 3 Extralong b 1mm nr nr 4 nr=norequirement. a Seeclause7.3. b Seeclause7.2. Table2Treatabilityclasses Impregnation procedure Minimumlateral penet

43、ration Averagelateral penetration Minimumaxial penetration Treatabilityclass Standard 15mm nr nr 1 Standard 3mm 6mm 300mm 2+ a Standard 3mm 6mm 300mm 2 Extralong b 1mm nr 300mm 3+ a Extralong b 1mm nr 300mm 3 Extralong b 1mm nr nr 4 nr=norequirement. a seeclause7.3. b seeclause7.2. 7.2 Differentiationbetweentre