1、BRITISH STANDARD BS EN 1744-3:2002 Tests for chemical properties of aggregates Part 3: Preparation of eluates by leaching of aggregates The European Standard EN 1744-3:2002 has the status of a British Standard ICS 91.100.15 BS EN 1744-3:2002 This British Standard, having been prepared under the dire
2、ction of the Building and Civil Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 9 August 2002 BSI 9 August 2002 ISBN 0 580 40248 7 National foreword This British Standard is the official English language version of
3、 EN 1744-3:2002, which is included in a package of new European Standards being prepared by CEN/TC 154 relating to aggregates. Although the English text versions of these European Standards will be adopted as British Standards as they become available, the existing British Standards for aggregates w
4、ill be retained, but only until such a time that the completed package of European Standards becomes available. The original group of British Standards will then be withdrawn and this will be noted in BSI Standards Update. The UK participation in its preparation was entrusted by Technical Committee
5、B/502, Aggregates, to Subcommittee B/502/6, Test methods, 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 or European publications referred to i
6、n 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 of
7、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 propo
8、sals 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 EN title page, pages 2 to 9 and a back cover. The BSI copyright date displaye
9、d in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN17443 July2002 ICS91.100.15 Englishversion TestsforchemicalpropertiesofaggregatesPart3:Preparation ofeluatesbyleachingofaggregate
10、s Essaispourdterminerlespropritschimiquesdes granulatsPartie3:Prparationdluatsparlixiviationdes granulats PrfverfahrenfrchemischeEigenschaftenvon GesteinskrnungenTeil3:HerstellungvonEluatendurch AuslaugungvonGesteinskrnungen ThisEuropeanStandardwasapprovedbyCENon5March2002. CENmembersareboundtocompl
11、ywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStan
12、dardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,De
13、nmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrigh
14、tsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN17443:2002EEN17443:2002(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences .4 3 Termsanddefinitions. .4 4 Principle 5 5 Reagents .6 6 Apparatus6 7 Sampling.6 8 Preparationoftestportions .6 9 Procedure .
15、7 10 Testreport .8 Bibliography 9EN17443:2002(E) 3 Foreword ThisdocumentEN17443:2002hasbeenpreparedbyTechnicalCommitteeCEN/TC154“Aggregates“,the secretariatofwhichisheldbyBSI. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelates
16、tbyJanuary2003,andconflictingnationalstandardsshallbewithdrawnatthelatest byJanuary2003. Thisstandardformspartofaseriesoftestsforchemicalpropertiesofaggregates.Testmethodsforotherproperties ofaggregateswillbecoveredbyPartsofthefollowingEuropeanStandards: EN932 Testsforgeneralpropertiesofaggregates E
17、N933 Testsforgeometricalpropertiesofaggregates EN1097 Testsformechanicalandphysicalpropertiesofaggregates EN1367 Testsforthermalandweatheringpropertiesofaggregates EN13179 Testsforfilleraggregateusedinbituminousmixtures TheotherpartsofEN1744are,orwillbe: Part1: Chemicalanalysis Part2: Determinationo
18、fresistancetoalkalireaction Part4: Watersusceptibilityoffillersforbituminousmixtures AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Icel
19、and,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom.EN17443:2002(E) 4 1Scope ThisEuropeanStandardspecifiesamethodforthepreparationofeluates,byleachingofaggregates,for subsequentinvestigationofphysicalandchemicalpropertiesbyexistingstandardmetho
20、dsforthepurposeof compliancetesting.Itappliestounboundaggregatesthathaveaparticlesizebelow32mmwithorwithoutsize reduction(seeclause8). 2Normative references ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplac
21、esinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN9321,
22、 TestsforgeneralpropertiesofaggregatesPart1:Methodsforsampling. EN9322, TestsforgeneralpropertiesofaggregatesPart2:Methodsforreducinglaboratorysamples. EN9325, TestsforgeneralpropertiesofaggregatesPart5:Commonequipmentandcalibration. EN9332, TestsforgeometricalpropertiesofaggregatesPart2:Determinati
23、onofparticlesizedistributionTest sieves,nominalsizeofapertures. EN10975, TestsformechanicalandphysicalpropertiesofaggregatesPart5:Determinationofthewatercontent bydryinginaventilatedoven. ENISO3696, WaterforanalyticallaboratoryuseSpecificationandtestmethods(ISO3696:1987). 3 Termsanddefinitions Forth
24、epurposesofthisEuropeanStandard,thefollowingtermsanddefinitionsapply. 3.1 leachant liquidusedinalaboratoryleachingprocedure 3.2 eluate solutionremainingafterthelaboratoryleachingprocedureofasolidmaterialincontactwithaleachant 3.3 constantmass successiveweighingsafterdryingatleast1hapartnotdifferingb
25、ymorethan0,1%. NOTE Inmanycasesconstantmasscanbeachievedafteratestportionhasbeendriedforapredeterminedperiodina specifiedovenat(1105)C.Testlaboratoriescandeterminethetimerequiredtoachieveconstantmassforspecifictypes and sizesofsampledependentuponthedryingcapacityoftheovenused. 3.4 laboratorysample s
26、ampleintendedforlaboratorytesting 3.5 testportion sampleusedasawholeinasingletestEN17443:2002(E) 5 4Principle Theaggregatetobeexaminedisplacedonascreeninsertandleachedinatank(seeFigure1).Theliquidsolid ratiois10:1(inmassproportion)andtheleachingtimeis24h.Thewaterisagitatedbyamotordrivendipstirrer. N
27、OTE Duringthetestproceduretheleachantisagitatedbutthesolidmaterialisnot. Themethodisbasedontheassumptionthatequilibriumornearequilibriumisachievedbetweentheliquidandsolid phasesduringthetestperiod.Thesolidresidueisdrawnoff.Thepropertiesoftheeluatearemeasuredusing methodsdevelopedforwateranalysisadap
28、tedtoanalysisofeluates. Dimensionsinmillimetres 300 1 2 3 4 5 6 7 + _ 10 400 + _ 10 NOTEDrawingnottoscale. Key 1 Motordrivendipstirrer 2C o v e r 3 Tank 4 Screensupport 5 Screeninsert(meshsize2mm) 6 Testportion 7 Stopcock Figure1ExampleoftankwithscreensupportEN17443:2002(E) 6 5Reagents 5.1 Distilled
29、water,demineralizedwater,deionizedwaterorwaterofanequivalentpurity(5pH7,5)witha conductivitylessthan0,5mS/mconformingtograde3ofENISO3696. 5.20,1mol/lnitricacid,analyticalgrade. 6Apparatus 6.1 Allapparatus ,unlessotherwisestated,shallconformtothegeneralrequirementsofEN9325. 6.2Balance ,capableofweigh
30、ing2kgwithanaccuracyof0,1g. 6.3Thermometer ,range0Cto50Candaccurateto1Cforairandleachanttemperaturemeasurement. 6.4Centrifuge, operatingat3000m/s 2 to4000m/s 2 . 6.5pHmeter ,readableto0,1pHunits. 6.6Electricalconductivitymeter . 6.7Filteringapparatus ,eitheravacuumfilteringdevice(between2,5Pato4,0Pa
31、)orahighpressurefiltration apparatus(500kPa),capableofrinsing. 6.8Prerinsed0,45mmembranefilters ,forfiltration(rinsedwithnitricacid,0,1mol/l(5.2)andwater(5.1). 6.9Tankforleaching. A onepiece glasstankofexternaldimensions,height(40010)mmanddiameter (30010)mm,withthefollowing: a) cover; b) screensuppo
32、rt,madeofPTFEorglass(orstainlesssteelforthedeterminationoforganicparametersonlyor polypropyleneforthedeterminationofinorganicparametersonly)withascreenmeshsize2mm,dimensions ofheight(5010)mmanddiametersuchthatthesupportis(202)mmfromtheedgeofthetank.The distancebetweenthebaseofthescreenandthebaseofth
33、etankshouldbe(505)mm.Forlightweight aggregates,thetestportionshallbecoveredbyasecondscreen; c) motordrivendipstirrerwithastirringrodandpropellerdiameter(6010)mmmadeofPTFEorPTFE coveredmaterialthatisinsertedthroughasmallholeinthecoverofthetank. 6.10Crushingequipment ,jawcrusheroracuttingdevice,forpar
34、ticlesretainedonthe32mmsieve. 6.11Sieves ,ofnominalsizes16mmand32mmconformingtoEN9332,forsievingrecrushedorcutparticles. 7Sampling SamplingshallbecarriedoutinaccordancewithEN9321. 8 Preparationoftestportions Aggregatesshallbetestedintheparticlesizedistributioninwhichtheyarenormallydelivered.Particle
35、sretained onthe32mmsieveshallbecrushedandthefraction16/32mmsievedout.Thismaterialisreturnedtothesample underpreparationinthepercentageinwhichthefractionlargerthan32mmwaspresentintheoriginalsample.EN17443:2002(E) 7 Ifthesampleiswetitshallbeairdriedatroomtemperature(40C) toconstantmasstoallowdividinga
36、nd screening.Thewatercontentofthesampleusedforleachingshallbedeterminedonaparallelsamplebydryingat 110C inaccordancewithEN10975. ReducethesizeofthelaboratorysampleinaccordancewiththeproceduresspecifiedinEN9322togiveatest portionwithamassofabout2kgandweighthetestportiontothenearest0,1g.Forlightweight
37、aggregates,the massofthetestportionshallbereducedinproportiontothedensityoftheaggregate.Itmayalsobenecessaryto increasetheliquid/solidratioin9.2inorderthatalightweightaggregatetestportioniscoveredwithwater. NOTE1 Contaminationofthesamplecanoccurtoanextent,whichaffectstheleachingofsomeconstituentsofc
38、oncern,for examplefromtungstencarbideequipmentorstainlesssteelapparatus.Careshouldbetakentoensurethatsuch contaminationofsamplesisminimised. NOTE2 Inthecaseoflightweightaggregateswithabulkdensitylessthan200kg/m 3 (0,2Mg/m 3 ),themassofthesample shouldbereducedto500g. 9Procedure 9.1Testing conditions
39、 Theleachingshallbecarriedoutatroomtemperature(20Cto25C) 9.2 Testprocedure Afterfillingthetankwithamassofleachantequalto10timesthedrymassofthetestportion,placethe appropriatescreenintothetankinsuchawaythatitiscompletelycoveredwithwater.Slowlydistributethetest portion,whichistoundergoleaching,uniform
40、lyoverthescreensothatasmuchairaspossibleisremovedfrom thetestportion.Whenthetestportionisarrangedonthescreen,thewatercovershallbeatleastat20mm.Then lowerthescreensupporttothebottomofthetank.Placethescreeninsertintheleachingtankinsuchawaythata uniformdistancefromthewallsofthevesselismaintained. Cover
41、theleachingtank.Insertthemotordrivendipstirrerthroughthesmallholeinthecoverofthetankandfixit insuchawaythatthepropelleriscloselyabovethetestportion.Setthemotordrivendipstirrertoarotational speedof(50020)min 1 .After24h10minswitchoffthestirreranddrawofftherequiredquantityofeluate,as specifiedin9.3,fo
42、ranalysis. NOTE Inthecaseoflightweightaggregateswithabulkdensitylessthan200kg/m 3 (0,2Mg/m 3 ),theamountofleachant shouldbeequaltofortytimesthedrymassofthesample. 9.3 Furtherpreparationoftheeluateforanalysis Immediatelyafterthetest,allowthecoarseparticlessuspendedintheleachanttosettlefor10minandthen
43、draw offtheeluatefromthetank. IfinorganicparameterstogetherwiththepHvalueandelectricalconductivityaretobedetermined,filtertheeluate throughamembranefilterofporesize0,45m. Iforganicparametersaretobedetermined(e.g.phenolindex),centrifugetheliquid.Careshallbetakentoensure thatthematerialofthecentrifugedoesnotinfluencetheresultsoftheanalysis. Duringthecentrifugingoperation,removethesuspendedparticulate
