1、A Referencenumbe r ISO/TR12960:1998 (E) TECHNICAL REPORT ISO/TR 12960 Firstedition 19981101 Geotextilesandgeotextilerelated productsScreeningtestmethodfor determiningtheresistancetoliquids GotextilesetproduitsapparentsMthodedessaipour ladterminationdelarsistanceauxliquidesISO/TR12960:1998(E) ISO1998
2、 Allrightsreserved.Unlessotherwisespecified,nopartofthispublicationmaybereproduced orutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingand microfilm,withoutpermissioninwritingfromthepublisher. InternationalOrganizationforStandardization Casepostale56 CH1211Genve20 Switzerland
3、 Internet isoiso.ch PrintedinSwitzerland ii Foreword ISO(theInternationalOrganizationforStandardization)isaworldwide federationofnationalstandardsbodies(ISOmemberbodies).Theworkof preparingInternationalStandardsisnormallycarriedoutthroughISO technicalcommittees.Eachmemberbodyinterestedinasubjectforw
4、hich atechnicalcommitteehasbeenestablishedhastherighttoberepresented onthatcommittee.Internationalorganizations,governmentalandnon governmental,inliaisonwithISO,alsotakepartinthework.ISO collaboratescloselywiththeInternationalElectrotechnicalCommission (IEC)onallmattersofelectrotechnicalstandardizat
5、ion. ThemaintaskoftechnicalcommitteesistoprepareInternational Standards,butinexceptionalcircumstancesatechnicalcommitteemay proposethepublicationofaTechnicalReportofoneofthefollowingtypes: type 1,whentherequiredsupportcannotbeobtainedforthe publicationofanInternationalStandard,despiterepeatedefforts
6、; type2,whenthesubjectisstillundertechnicaldevelopmentorwhere foranyotherreasonthereisthefuturebutnotimmediatepossibilityof anagreementonanInternationalStandard; type3,whenatechnicalcommitteehascollecteddataofadifferent kindfromthatwhichisnormallypublishedasanInternationalStandard (“stateoftheart”,f
7、orexample). TechnicalReportsoftypes1and2aresubjecttoreviewwithinthreeyears ofpublication,todecidewhethertheycanbetransformedintoInternational Standards.TechnicalReportsoftype 3donotnecessarilyhavetobe revieweduntildatatheyprovideareconsideredtobenolongervalidor useful. TechnicalReportsaredraftedinac
8、cordancewiththerulesgiveninthe ISO/IECDirectives,Part3. Attentionisdrawntothepossibilitythatsomeoftheelementsofthis TechnicalReportISO/TR12960maybethesubjectofpatentrights.ISO shallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.ISO ISO/TR12960:1998(E) iii ISO/TR12960,whichisaTechnicalRep
9、ortoftype2,waspreparedbythe EuropeanCommitteeforStandardization(CEN)incollaborationwithISO TechnicalCommitteeTC38, Textiles,SubcommitteeSC21, Geotextiles,in accordancewiththeAgreementontechnicalcooperationbetweenISOand CEN(ViennaAgreement). Throughoutthetextofthisdocument,read“.thisEuropeanprestanda
10、rd.” tomean“.thisTechnicalReport.”. ThisdocumentisbeingissuedintheTechnicalReport(type2)seriesof publications (according to subclause G.3.2.2 of Part1 of the ISO/IEC Directives,1995)asa“prospectivestandardforprovisionalapplication”in thefieldofGeotextilesbecausethereisanurgentneedforguidanceon howst
11、andardsinthisfieldshouldbeusedtomeetanidentifiedneed. Thisdocumentisnottoberegardedasan“InternationalStandard”.Itis proposedforprovisionalapplicationsothatinformationandexperienceof itsuseinpracticemaybegathered.Commentsonthecontentofthis documentshouldbesenttotheISOCentralSecretariat. Areviewofthis
12、TechnicalReport(type2)willbecarriedoutnotlaterthan threeyearsafteritspublicationwiththeoptionsof:extensionforanother threeyears;conversionintoanInternationalStandard;orwithdrawal. AnnexAofthisTechnicalReportisforinformationonly. AnnexZZprovidesalistofcorrespondingInternationalandEuropean Standardsfo
13、rwhichequivalentsarenotgiveninthetext.ISO/TR12960:1998(E) ISO iv Foreword ThetextofENVISO12960:1998hasbeenpreparedbyTechnicalCommittee CEN/TC189“Geotextilesandgeotextilerelatedproducts“,thesecretariatofwhich isheldbyIBN,incollaborationwithTechnicalCommitteeISO/TC38“Textiles“. AccordingtotheCEN/CENEL
14、ECInternalRegulations,thenationalstandards organizationsofthefollowingcountriesareboundtoimplementthisEuropean Standard:Austria,Belgium,CzechRepublic,Denmark,Finland,France,Germany, Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom.ISO I
15、SO/TR12960:1998(E) v Introduction Innearlyallapplicationsgeotextilesandgeotextilerelatedproducts(geotextile products)maybeincontactwithaqueoussolutionsofacids,basesordissolved oxygen.Theresistanceofgeotextileproductstothesechemicalsdependsonthe onehandonpolymerformulation,processing,textilestructure
16、andthepresenceof existingdamageandontheotherhandonthecompositionoftheliquidandinsitu conditionssuchastemperature,pressureandthepresenceoffurthermechanical stress. Itisthepurposeofthisprestandardtoprovideamethodofscreening(indextesting) theresistanceofgeotextileproductstotheseacidsandbases. Sinceanin
17、dextestrequiresexposuretimesthatareshortcomparedtotheexpected lifetimesofgeotextileproducts,itisnecessarytoacceleratetheprocess.Thedata obtainablearesuitableforscreeningbutnotforderivingperformancedatasuchas lifetime,unlesssupportedbyfurtherevidence.ISO ISO/TR12960:1998(E) 1 1 Scope Thisstandardspec
18、ifiesmethodsforscreeningtheresistanceofgeotextileproducts toliquidswhilenotsubjectingthemtoexternalmechanicalstress. Thestandardisapplicabletoallgeotextilesandgeotextilerelatedproducts. NOTE:Thisstandardonlyconsidersconditionswherethespecimensare fullyimmersedintheliquids.Thoughoutsidethescopeofthis
19、standard, thetestconditionsmaybemodifiedtoaccommodateparticular applications,eggaseousmedia.Thisstandarddoesnotprecludeusefor testspecimensthatarepretreatedbysomemethod,e.g.byweathering, aqueousextractionconditionsorinstallationdamage. 2 Normativereferences ThisEuropeanprestandardincorporatesbydated
20、orundatedreference,provisions fromotherpublications.Thesenormativereferencesarecitedattheappropriate placesinthetextandthepublicationsarelistedhereafter.Fordatedreferences, subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothis Europeanprestandardonlywhenincorporatedinitbyamendmentorre
21、vision.For undatedreferencesthelatesteditionofthepublicationreferredtoapplies. ENV12226 Geotextilesand geotextilerelatedproductsGeneraltestsfor evaluationfollowin gdurabilit ytestin g ISO3696 Waterforanal yticallaborator yuseSpecificationandtestmethods 3 Principle Testspecimensarecompletelyimmersedi
22、natestliquidforagiventestdurationat afixedtemperature.Thepropertiesofthetestspecimensaretestedbeforeand afterimmersionandifapplicableafterdrying,andwhereverpossible,thetestresults arecomparedwiththoseofcontrolspecimensstoredunderreferenceconditions. 4 Generalrequirementsandprocedure 4.1 Apparatus Ac
23、ontainer,e.g.apneumaticvessel,istobeused,equippedwith: asealinglidorequivalentdeviceandifnecessaryarefluxcondenseror equivalentdevicetorestrictevaporationofvolatilecomponents; astirringorequivalentdevicetomaintainhomogeneityoftheliquidand theexchangeofmatterbetweentheliquidandthespecimens; specimenh
24、olderstoensurecorrectplacingofthespecimens(see 4.6.2),thefreedistancebetweenspecimensbeingatleast10mm; atleastoneclosableapertureinthelidforaccesstocontrolthe compositionoftheliquid.ISO/TR12960:1998(E) ISO 2 Thecontainershallbelargeenoughforthetestliquid(see4.6.1),whichshallbe heldatconstanttemperat
25、ure(see4.3). Thematerialofthecontainerandequipmentshallberesistanttothetestchemicals. Suchmaterialsareingeneralborosilicateglassorstainlesssteel. 4.2 Testliquids Twotypesoftestliquidsaretobeused: aninorganicacid:0,025Msulfuricacid(methodA); aninorganicbase:calciumhydroxide(Ca(OH)2),usedasasaturated
26、suspension,i.e.approximately2,5gramsperlitre(methodB). Chemicalsofreagentoranalyticalgradeshouldbeused.Watershallcomplywith ISO3696,grade3. Nationalsafetyregulationsforhandlingofchemicalsandfordisposaloftestliquids shallbefollowed. NOTE:Foranytestmediumitisanimportantconditionthatits compositionrema
27、insconstantduringthetestexposure.Thismaybe complicatediftheconcentrationofanyactivecomponentisloworifthe liquidisnotastableonephasesystem.Insuchcasestheconcentration shouldbemonitoredandifpossibleadjustedorreplacedonaregular basis.Attentionshouldbegivenalsotopossiblecatalyticorsynergistic effects,in
28、cludingeffectsofsimultaneouschemicalandmechanical stresses(egenvironmentalstresscrackinginpolyolefins).Thechoiceof theconcentrationoftheactivespeciesisgovernedbytheaimtoavoid significantchangesoftheconcentrationduringthetestandtoaccelerate thereactionbuttoavoidachangeintheactivemechanismbyusingtoo h
29、ighaconcentration. 4.3 Testtemperatures Thetesttemperatureshallbe(601)Cforeachmethod. 4.4 Testduration Thetestdurationshallbe3daysforeachmethod. 4.5 Specimens ReferenceismadetoENV12226. Thenumberofspecimensshallbefivetestspecimensandfivecontrolspecimens. NOTE1:Itisrecommendedthatadditionalspecimensb
30、eexposed.Ifa mechanicaltestisinvalid,afurtherspecimenshouldbetestedinits place.ISO ISO/TR12960:1998(E) 3 NOTE2:Iftheproductsaresheathedbysomecoating,whichcouldbe penetratedduringinstallation,theproductshouldbetestedwithand withoutthecoating.Ifnot,thepossibilityofachangeinchemical resistanceincaseofd
31、estructionordamagetothesheathshouldbe notedinthereport. 4.6 Procedure 4.6.1 Quantityofthetestliquid Thequantityoftestliquidshallbegreaterthan30timestheweightofthespecimens andshallcoverthespecimenscompletely. 4.6.2 Positioningofspecimens Thespecimensshallbeplacedinthevesselfreeofanysignificantmechan
32、ical stress. Themeandistancebetweenthespecimens,betweenthespecimensandthewalls ofthevessel,andbetweenthespecimensandthesurfaceoftheliquid,shallbeat least1cm.Nosignificantproportionofthesurfaceofthespecimensshallmake contactwithamaterialotherthanthetestliquiditself. Specimensofdifferentmaterialsshall
33、notbetestedinthesamevessel.Duringthe testtheexchangeofmatterbetweenliquidandgeotextileshallnotbehinderedby poorconvectionofthetestliquid. Calciumhydroxideshallbestirredcontinuously;sulfuricacidatleastonceperday. ThepHoftheliquidshallbemeasuredandrecordedand,wherenecessary,liquid shallbereplenishedor
34、replacedtomaintaintheoriginalpHatleasteveryseventh day.Theliquidandthespecimensshallbeshieldedfromlight. 4.6.3 Controlspecimens Thecontrolspecimensshallbeimmersedforonehourinwateratthesame temperatureasthetestspecimens.WatershallbeinaccordancewithSection4.2. 4.6.4 Rinsing,wipinganddrying Rinsingshal
35、lbeperformedinwatercomplyingwith4.2.,thenin0.01Msodium carbonatesolution,finallyinwateragain.Thequantitiesshallbesufficienttoensure thoroughcleaning. Inexposingpolyestergeotextilestocalciumhydroxideitisnecessarytoremove adheringcrystalsofcalciumterephthalate.Thismaybedonebyrinsingfor5min witha10%sol
36、ution(byweight)oftrisodiumnitrilotriacetate(NTA)inanagitating device,followedbyrinsingina3%solution(byweight)ofaceticacidandfinally rinsingwithwater.ISO/TR12960:1998(E) ISO 4 Specimensshallbedriedatroomtemperatureoratelevatedtemperatureupto 60C.Specimensshouldnotbesubjectedtounduestressduringdrying.
37、 4.7 Determinationofchangesinproperties. ThechangesaredeterminedinaccordancewithENV12226. 5 Testreport Thetestreportshallcontainparticularstothefollowingitems: referencetothisprestandard; descriptionofthematerial; resultsexpressedinaccordancewithENV12226; dateoftest; anydeviationsfromthisstandardand
38、anyfactorslikelytohave influencedtheresults.ISO ISO/TR12960:1998(E) 5 AnnexA(informative) Bibliography ISO175 PlasticsDeterminationoftheeffectsofli quidchemicals,includin g water ISO554 Standardatmospheresforconditionin gand/ortestin g Specifications ISO3205 Preferredtesttemperatures ISO3301 Statist
39、icalinterpretationofdataComparisonoftwomeansinthe caseofpairedobservationsISO/TR12960:1998(E) ISO 6 AnnexZZ (informative) CorrespondingInternationalandEuropeanStandardsforwhichequivalents arenotgiveninthetest AtthetimeofpublicationofthisTechnicalReportISO/TR12960,thefollowingISOdocumentswereequivalentto thenormativeEuropeanStandardsreferencedinthetext.MembersofISOandIECmaintainregistersofcurrently validInternationalStandards. ENV12226 ISO/TR13429, GeotextilesGeneraltestsforevaluationfollowingdurabilitytesting.ISO/TR12960:1998(E) ISO ICS59.080.70 Pricebasedon6pages
