1、BRITISH STANDARD BS EN 990:2002 Test methods for verification of corrosion protection of reinforcement in autoclaved aerated concrete and lightweight aggregate concrete with open structure The European Standard EN 990:2002 has the status of a British Standard ICS 91.100.30 BS EN 990:2002 This Britis
2、h Standard, having been prepared under the direction of the Building and Civil Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 16 October 2002 BSI 16 October 2002 ISBN 0 580 40579 6 National foreword This British S
3、tandard is the official English language version of EN 990:2002. It supersedes BS EN 990:1996 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee B/523, Prefabricated components of reinforced autoclaved aerated concrete and lightweight aggregate concrete
4、with open structure, which has the responsibility to: A list of organizations represented on this committee can 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
5、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 a contract. Users are responsible for it
6、s 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 proposals for change, and keep the UK interes
7、ts 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 7 and a back cover. The BSI copyright date displayed in this document indicates when the do
8、cument was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN990 September2002 ICS91.100.30 SupersedesEN990:1995 Englishversion Testmethodsforverificationofcorrosionprotectionof reinforcementinautoclavedaeratedconcreteandlightweig
9、ht aggregateconcretewithopenstructure Mthodesdessaipourlavrificationdelaprotectioncontre lacorrosiondesarmaturesdanslebtoncellulaire autoclavetlebtondegranulatslgersstructure ouverte PrfverfahrenzurberprfungdesKorrosion sschutzesder BewehrungindampfgehrtetemPorenbetonundin haufwerksporigemLeichtbeto
10、n ThisEuropeanStandardwasapprovedbyCENon21July2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmayb
11、eobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versio
12、ns. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKO
13、MITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN990:2002EEN990:2002(E) 2 Contents page Foreword3 1 Scope 3 2 Normativereferences 3 3 Principle4 4 Apparatus .4 5 Testspecimens 4 5.1 Ge
14、neral4 5.2 Sealingoftheendfacesandconditioningofthetestspecimens5 6 Corrosiontests. 5 6.1 Shorttermtestwithalternatewettingwithsodiumchloridesolutionanddryinginair(method 1) 5 6.1.1 Exposurecycles. 5 6.1.2 Examinationofsteelsurfaceandevaluationofresults 6 6.2 Shorttermtestwithalternatewettingwithwat
15、eranddryinginwarmair(method2) .6 6.2.1 Exposurecycles. 6 6.2.2 Examinationofthesteelsurfaceandevaluationofresults 6 6.3 Shorttermtestwithalternatingtemperature(method3) . .6 6.3.1 Exposurecycles. 6 6.3.2 Examinationofthesteelsurfaceandevaluationofresults 6 7 Testreport . .7EN990:2002(E) 3 Foreword T
16、hisdocument(EN990:2002)hasbeenpreparedbyTechnicalCommitteeCEN/TC177“Prefabricatedreinforced componentsofautoclavedaeratedconcreteorlightweightaggregateconcretewithopenstructure“,thesecretariat ofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanide
17、nticaltextor byendorsement,atthelatestbyMarch2003,andconflictingnationalstandardsshallbewithdrawnatthelatestby March2003. ThisdocumentsupersedesEN990:1995. Inordertomeettheperformancerequirementsaslaiddownintheproductstandardsforprefabricatedreinforced componentsofautoclavedaeratedconcreteorforprefa
18、bricatedreinforcedcomponentsoflightweightaggregate concretewithopenstructureanumberofstandardisedtestmethodsarenecessary. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmar
19、k,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom. 1Scope ThisEuropeanStandardspecifiesthetestmethodsforverificationoftheeffectivenessofthecorrosionprotectionof reinforcingsteelembeddedincomponentsofautocl
20、avedaeratedconcrete(AAC)accordingtoprEN12602orin componentsoflightweightaggregateconcretewithopenstructure(LAC)accordingtoprEN1520. TestsaccordingtothisEuropeanStandardarenotrequiredforLACcomponentsifcorrosionprotectionisachieved byembeddingthereinforcingbarscompletelyinazoneofconcretewithclosedstru
21、ctureaccordingtoprEN 1520:2002,5.8.3.3. Threedifferentmethodsofshorttermtests(methods1to3)areprovided. Thetestmethodscanbeusedtoexaminethefundamentalsuitabilityofacorrosionprotectivesystemincombination withadefinedmanufacturingprocessfortheproductionofreinforcedcomponents.Theycanalsobeusedforcurrent
22、 productioncontrol. NOTE Thespecificationofthreedifferentshorttermtestmethodsisbasedonhistoricalreasonsandestablishedprocedures ratherthanontechnicalneeds. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecite
23、dattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includin
24、gamendments). prEN1520:2002, Prefabricatedreinforcedcomponentsoflightweightaggregateconcretewithopenstructure. prEN12602, Prefabricatedreinforcedcomponentsofautoclavedaeratedconcrete.EN990:2002(E) 4 3Principle Testspecimensconsistingofautoclavedaeratedconcrete(AAC)orlightweightaggregateconcretewitho
25、pen structure(LAC)withembeddedreinforcingbarsarecutfromprefabricatedreinforcedcomponentsormanufactured separately.Thetestspecimensareexposedtoadefinedcorrosiveenvironmentforaspecifiedseriesofexposure cycles.Immediatelyaftertheendofthecorrosiveexposuretheconcreteandtheprotectivecoatingareremoved from
26、theembeddedbars.Thesteelsurfaceisexaminedvisuallyforcorrosionandtheareaofthecorrodedsurface isdeterminedandcomparedwiththelimitsaccordingtotherelevantproductstandardprEN1520orprEN12602. 4Apparatus a) Saw Asawforcuttingtestspecimensfromreinforcedcomponentswithoutexcessiveheatingorvibrations. b) Equip
27、mentforshorttermtestwithalternatewettingwithsodiumchloridesolutionanddryinginair(method1): 1) afacilityforwettingthetestspecimensfor2hwithsodiumchloridesolution(concentration3%bymass) byimmersioninatankorbycontinuousspraying; 2) aventilatedroomorcabinetfordryingthetestspecimensinairat(15to30) Cfor70
28、h.Therelativehumidity andtheairmovementshallbesuchthattherateofevaporationfromacylindricalbeakerof(80 5)mm diameterinitiallyfilledwithwaterto20mmfromitstopis(50 25)mlper24h. c) Equipmentforshorttermtestwithalternatewettingwithwateranddryinginwarmair(method2): 1) afacilityforwettingthetestspecimenswi
29、thwater(waterbasinorwaterspray); 2) aventilatedroomorcabinetcapableofmaintaininganairtemperatureof(40 5) Candwithprovisionsfor circulatingairintoandoutoftheroomduringthedryingperiodinauniformmanner.Therelativehumidityand theairmovementshallbesuchthattherateofevaporationfromacylindricalbeakerof(80 5)
30、mmdiameter initiallyfilledwithwaterto20mmfromitstopis(200 75)mlper24h. NOTE Toenableautomationofthewettinganddryingcyclesitcanbeconvenienttoaccommodatethewetting equipmentaccordingto1)intheventilatedroomorcabinetandtoinstallanautomatictemperaturecontrolsystem. d) Equipmentforshorttermtestwithalterna
31、tingtemperature(method3): ahumiditycabinetforthestorageofthetestspecimensinmoisturesaturatedair(relativehumidity 95%). Theairtemperatureinthecabinetshallalternateevery3hbetween(25 5) Cand(55 5) C.Theindicated temperaturesshallbereachedwithinapproximately1hineachcaseandthenbemaintainedconstantduring
32、therestofthe3hperiod. 5 Testspecimens 5.1General Thetestspecimensshallbe400mmlongprismaticsectionseithercutfromprefabricatedreinforcedcomponentsof currentproduction(normalcase)orespeciallymanufacturedforthispurposeunderconditionsascloseaspossible tothoseofcurrentproduction. Eachtestspecimenshallcont
33、ainatleasttworeinforcingbarscoatedwiththeprotectivesystemtobetested. Wherethetestspecimensareespeciallymanufactured,thebarsshallbefreefromcorrosionbeforeapplyingthe protectivesystem. Thewidthandtheheight(thickness)ofthetestspecimensshallbesuchthatthereinforcingbarsarecoveredonall sideswithatleastthe
34、minimumnominalconcretecoverrequiredintherelevantproductstandard.EN990:2002(E) 5 Ifthetestspecimensarecutfromprefabricatedreinforcedcomponents,theirheightshallextendoverthefullheight (thickness)ofthecomponent. Inordertoavoiddamageduetothecuttingoperationthetestspecimensshallbecutfromthereinforced com
35、ponents notlessthan2dafterautoclavinginthecaseofAAC; notlessthan7daftercastinginthecaseofLAC. Whenthetestspecimensaremanufacturedseparately,theconcretecoveratthebottomshallbeequaltothe minimumvaluerequiredintheproductstandardsprEN1520orprEN12602,respectively,andthecoveratthetop shallbeatleastequalto
36、thatvalue.Testspecimensrepresentingmultilayercomponentsshallhavethesame structureasthecorrespondingprefabricatedcomponents. Foreachcorrosiontestatleastthreetestspecimensarerequired.Threeadditionalcompanionspecimensshould beprovidedtoenablecomparisonofthecorrosionphenomenaofthereinforcementoftheexpos
37、edtestspecimens withthatofthereinforcementofunexposedspecimens.Thisisnotnecessaryifitiscertainthatthesteelsurface hasbeenfreeofanysignsofcorrosionbeforetheprotectivesystemhasbeenapplied. Thecompanionspecimensshallbestoredinanoncorrosiveenvironment(relativehumidityoftheair 70%)until theendofthecorros
38、iontests. NOTE Thepurposeofthecompanionspecimensistoenabletodifferentiatebetweenthecorrosionphenomenacausedby thetestconditionsandthecorrosionwhichpossiblymighthavebeenpresentonthesteelsurfaceinitially,beforethebeginni ng ofthetest,duetotheuseofreinforcementwhichhadbeencorroded(tothepermissibleexten
39、t)beforeapplyingofthecorrosi on protectivesystem.Onlythe(additional)amountofcorrosioncausedbythetestconditionsisofinterestfortheevaluationof the suitabilityofthecorrosionprotectivesystem. 5.2 Sealingoftheendfacesandconditioningofthetestspecimens Precautionsshallbetakensothatcorrosiondoesnotenterfrom
40、theendfacesofthetestspecimensintothe interior,e.g.byapplicationofanimpermeablelayerontheendfaces. Fortestsaccordingtomethod3thetestspecimensshallbeconditionedpriortothetestbystoringthemfor2h underwater(tapwater,approximately20 C)andsubsequentlyinairatnormalroomtemperature(15to30) C andnormalrelative
41、humidity(30to70)%foraperiodof14d. Thecorrosiontestingshallbestartednotlessthan7dafterautoclavinginthecaseofAACandnotlessthan28d aftermanufactureinthecaseofLAC. 6Corrosion tests 6.1 Shorttermtestwithalternatewettingwithsodiumchloridesolutionanddryinginair (method1) 6.1.1Exposure cycles Thetestspecime
42、nsshallbeexposedto10exposurecycles.Eachexposurecycleconsistsof 2hwettingwithsodiumchloridesolutionwithaconcentrationof3%bymass; 70hdryinginairunderconditionsindicatedin4.b2). Thedryingperiodmaybeextendedtoatotallengthof7d,ifrequired,e.g.atweekendsorholidays.Controlofhumidity andairmovementinordertoa
43、chievetheprescribedrateofevaporationisonlynecessaryforaperiodof70h.EN990:2002(E) 6 6.1.2 Examinationofsteelsurfaceandevaluationofresults Immediately(notmorethan4d)afterthelastdryingperiodtheconcreteandtheprotectivecoverareremovedfrom thereinforcingbars,andthesteelsurfaceisexaminedvisuallyfromallsides. Foreachtestspecimenthecorrodedareashallbedeterminedbymeasurementandcalculationandexpressedas apercentageofthetotalsurfaceareaofthereinforcementc
