1、BRITISH STANDARD BS EN 772-14:2002 Methods of test for masonry units Part 14: Determination of moisture movement of aggregate concrete and manufactured stone masonry units The European Standard EN 772-14:2001 has the status of a British Standard ICS 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT
2、 AS PERMITTED BY COPYRIGHT LAWBS EN 772-14:2002 This British Standard, having been prepared under the direction of the Sector Policy and Strategy Committee for Building and Civil Engineering, was published under the authority of the Standards Policy and Strategy Committee on 31 January 2002 BSI 31 J
3、anuary 2002 ISBN 0 580 38985 5 National foreword This British Standard is the official English language version of EN 772-14:2001. EN 772-14 is a supporting standard to the forthcoming harmonized European product standard specifications on aggregate concrete masonry unit, EN 771-3, and manufactured
4、stone units, EN 771-5. These standards are the subject of transitional arrangements agreed under the Commission mandate. The Member States have agreed a nominal transition period for the co-existence of these standards and their corresponding national standard(s). It is intended that this period wil
5、l comprise a nominal nine month period during which any required changes to national regulations are to be made, followed by a further nominal twelve month period for the implementation of CE marking. At the end of this co-existence period, the national standard(s) will be withdrawn. In the UK, the
6、corresponding national standard to EN 772-14, EN 771-3 and EN 771-5 is: BS 6073-1:1981, Precast concrete masonry units Part 1: Specification for precast concrete masonry units. As EN 772-14 is a supporting standard to the forthcoming harmonized EN 771-3 and EN 771-5, the nominal transition period of
7、 twenty-one months for EN 772-14 will commence upon the date of availability of either EN 771-3 or EN 771-5, whichever is the later. At the end of this period BS 6073-1:1981 will be withdrawn. NOTE Users of BS 6073-1:1981 should contact BSI Customer Services for confirmation of withdrawal. The UK pa
8、rticipation in its preparation was entrusted by Technical Committee B/519, Masonry and associated testing, to Subcommittee B/519/1, Masonry units, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references T
9、he British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A
10、 British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; pres
11、ent to the responsible 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 pages This document comprises a front cover, an inside front c
12、over, the EN title page, pages 2 to 10, an inside back cover 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 NORMEEUROPENNE EUROPISCHENORM EN77214 November2001
13、ICS91.100.30 Englishversion MethodsoftestformasonryunitsPart14:Determinationof moisturemovementofaggregateconcreteandmanufactured stonemasonryunits MthodedessaipourdeslmentsdemaonneriePartie: 14dterminationdelavariationduelhumiditdes lmentsdemaonnerieenbtondegranulatsetenpierre reconstitue Prfverfah
14、renfrMauersteineTeil14:Bestimmungder feuchtebedingtenFormnderungvonMauersteinenaus BetonundBetonwerksteinen ThisEuropeanStandardwasapprovedbyCENon13October2001. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanation
15、alstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresp
16、onsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,Swi
17、tzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2001CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN77214:2001EEN77214:2001(E) 2 Con
18、tents page Foreword 3 1Scope 4 2Normativereferences 4 3Principle 4 4Symbols 4 5Apparatus 5 6Preparationofspecimens 5 7Procedure 7 8Expressionofresults 9 9Evaluationofresults 9 10Testreport 10EN77214:2001(E) 3 Foreword ThisEuropeanStandardhasbeenpreparedbyTechnicalCommitteeCEN/TC125“Masonry“,the secr
19、etariatofwhichisheldbyBSI. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofan identicaltextorbyendorsement,atthelatestbyMay2002,andconflictingnationalstandardsshall bewithdrawnatthelatestbyMarch2004. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardso
20、rganizationsofthe followingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg, Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN77214:2001(E) 4 1Scope ThisEuropeanStandardspec
21、ifiesamethodofmeasuringthemoisturemovementofaggregate concreteandmanufacturedstonemasonryunitsbetweentwospecifiedextrememoistureconditions. 2Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromother publications.Thesenormativereferencesarecitedattheappropriate
22、placesinthetext,andthe publicationsarelistedhereafter.Fordatedreferences,subsequentamendmentstoorrevisionsofany ofthesepublicationsapplytothisEuropeanStandardonlywhenincorporatedinitbyamendmentor revision.Forundatedreferencesthelatesteditionofthepublicationreferredtoapplies(including amendments). pr
23、EN7713, SpecificationformasonryunitsPart3:Aggregateconcretemasonryunits(denseand lightweightaggregates). prEN7715, SpecificationformasonryunitsPart5:Manufacturedstonemasonryunits. 3Principle Thistestmeasures,onmasonryunitsofthesameconcretecompositionsandthesamesampling: a)theexpansionbetweentheiniti
24、alconditionandaftersoakinginwaterfor4days; b)theshrinkagebetweentheinitialconditionandafterdryingfor21daysinaventilated ovenat33C. 4Symbols l 0 i istheinitialdistancebetweengaugelocationpads,(mm) l 1 i isthedistancebetweengaugelocationpadsaftersoaking,(mm) l 2i isthedistancebetweengaugelocationpadsa
25、fterdrying,(mm) l g /l isthemeanmoistureexpansioncoefficient,(mm/m) l r /l isthemeandryingshrinkagecoefficient,(mm/m) l c /l isthetotalmovementcoefficient,(mm/m)EN77214:2001(E) 5 l gi /l istheindividualmoistureexpansioncoefficient,(mm/m) l ri /l istheindividualdryingshrinkagecoefficient,(mm/m) m o,s
26、 isthemassofspecimenbeforedrying,(g) m dry,s isthemassofspecimenafterdrying,(g) w s isthemoisturecontent,(%)bymass 5Apparatus 5.1Gaugelocationpads. 5.2Adhesive appropriateforuseundertheconditionsgivenin5.4and5.5. 5.3Measuringdevicesuitableformeasuringchangesinlengthwithanaccuracyofatleast 0,002mm. 5
27、.4Ventilatedoven withavolumeofatleast9timesthevolumeofthespecimenstobedriedatone time,capableofbeingmaintainedatatemperatureof33C3C.Theovenisventilatedtopand bottomforfreeconvectionorbyaforcedsystemthatensuresatleast3airchangesperhour. 5.5Tankofwater ,maintainedatatemperatureof20C2Candofsufficientvo
28、lumetoholdall thespecimenstobesoakedatonetimeandtoensurefreeaccessofthewatertoallfaces. 5.6Weighinginstrument capableofweighingthespecimenswithanaccuracyof0,1%. 5.7Calibrationrods ofInvarsteel. 5.8Four supportpads perspecimenof1cm 2 maximumcrosssectionandwithaminimumheightof 10mm. 6Preparationofspec
29、imens 6.1Sampling Thetestspecimensshallconsistofwholemasonryunitsorbecutfromwholemasonryunits.Inevery casethesamplesshallbesealedinairtightbagsimmediatelyaftersamplinguntiltheyareprepared fortest.Thedatesofmanufacturingandsamplingshallbedeclared.Theageofthespecimensatthe beginningofthetestshallbe28d
30、aysunlessotherwiseisspecified.EN77214:2001(E) 6 Themethodofsamplingshallbestatedinthetestreport.Theminimumnumberofspecimensshallbe six,butalargerminimumnumbermaybespecifiedintheproductspecification,inwhichcasethat largernumbershallbeused. 6.2Conditioning Unlessotherwiseisspecified,removethespecimens
31、fromtheairtightbagsafter14daysandstore themforafurther14daysinthelaboratoryunderthefollowingconditions: Temperature 15 C Relativehumidity 65% Inthelaboratorystorethespecimenssothateachoneissimilarlyexposed. Attheendofthe14daylaboratorystorageweigheveryspecimenandnumberthem1to6fromthe lightesttothehe
32、aviest( m o,s ). Thetestshallbedeemedtohavebegunattheendofthe14daylaboratoryconditioningperiod followingthe14daysinairtightbags. 6.3Preparationformeasurements Fixtwogaugelocationpads(5.1)usingappropriateadhesiveglue(5.2)toeachofthespecimensatan appropriategaugelengthapart(seeTable1)inanappropriatepo
33、sition(seeFigure1)andmarkoneof thepadsoneachspecimenwithadistinctivesign.Asuitabletemplateshouldbeusedtospacethe pads. Table1Gaugelengthforspecimens Dimensionsinmillimetres Lengthofspecimen Minimumgaugelength 100to200 80 201to300 180 over300 280EN77214:2001(E) 7 a)Fixonbedface b)Fixontheexternalshel
34、l Figure1Positioningofgaugelocationpads a)Forspecimenswhicharewholeunitswithoutvoidspassingrightthrough,fixthegauge locationpadsonthebedface. b)Forspecimenswhicharewholemasonryunitswithvoidspassingrightthrough,fixthe gaugelocationpadsontheshell. c)Forspecimenswhicharepartsofmasonryunitsfixthegaugelo
35、cationpadsonasurface whichwouldbeabedface,seea)above. 7Procedure 7.1General Carryoutthetestinlaboratorymaintainedatatemperatureof20C2Candarelativehumidityof 50%to65%. BeforetakinganymeasurementscalibratethemeasuringdeviceusingtheInvarcalibrationrods(5.7). 7.2Initialmeasurement Keepthespecimeninthela
36、boratoryfor6hbeforetakingthefirstmeasurements.Measuretheinitial distancel oi betweenthepadsonthe6specimens,takingcaretoplacethemobileendofthegaugeon themarkedpad. Recordtheresultsinmmatleasttothenearest0,002mm.EN77214:2001(E) 8 7.3Measurementofmoistureexpansion PlacethespecimensNos.2,4and6inthewater
37、tank(5.5)at20C2Cwiththelocationpads uppermost.Usethesupportpads(5.8)tokeepthespecimensatleast10mmfromthebottomofthe tankandensureatleast50mmofwateroverthetopofthem(seeFigure2). Dimensionsinmillimetres 50 10 Figure2Positioningofspecimensinwatertank After96hinwaterremovethespecimensfromthewatertank,al
38、lowthemtodrainfor10minand thenmeasurethedistance l 1i betweenthepadsonthe3specimens,placingthemobileendofthe gaugeonthemarkedpad. Recordtheresultsinmmatleasttothenearest0,002mm. 7.4Measurementofdryingshrinkage PlacespecimensNos.1,3and5intheventilatedoven(5.4)at33C3Corientedastheyare expectedtobeused
39、.Ensurethatthehotairhasfreeaccesstoallfaces. After21days,removethespecimensfromtheovenandallowtostabilizeinthelaboratoryfor6h. Measurethedistance l 2i betweenthepadsonthethreespecimens,placingthemobileendofthegauge onthemarkedpad. Recordtheresultsinmmatleasttothenearest0,002mm. Weigheachspecimen( m
40、dry,s ).EN77214:2001(E) 9 8Expressionofresults 8.1Moistureexpansion Calculatethemoistureexpansioncoefficientofeachofthespecimensusingtheformula: m / mm 1000 i 0 i 0 i 1 gi l l l l l 8.2Dryingshrinkage Calculatethedryingshrinkagecoefficientofeachofthespecimensusingtheformula: m / mm 1000 i 0 i 2 i 0
41、ri l l l l l Calculatethemoisturecontent( w s )ofthespecimens1,3and5fromtheratioofthelossinmassduring dryingtothedrymassexpressedtothenearest0,5%. 100% = dry,s dry,s o,s s m m m w 9Evaluationofresults Calculatethearithmeticmeanofthemoistureexpansioncoefficientsforthethreespecimens l l g to twodecima
42、lplaces. Calculatethearithmeticmeanofthedryingshrinkagecoefficientsforthethreespecimens l l r to twodecimalplaces. Calculatethetotalmovementcoefficientofthesample l l l l l l g r c andrecorditto0,01mm/mEN77214:2001(E) 10 Calculatethemeanvalueofthemoisturecontentofthespecimens1,3and5( w s ) tothenear
43、est1%and reportasthemoisturecontentofthesample. 10Testreport Thetestreportshallcontainthefollowinginformation: a)thenumber,titleanddateofissueofthisEuropeanStandard; b)descriptionofthemasonryunittotherelevantstandardprEN7713or prEN7715; c)themethodofsamplingandbywhichorganization; d)thedateofproduct
44、ionandthedateofsamplingofthespecimens; e)thedateofpreparationofthespecimens,thedatesofcommencement 1) andcompletionof thetestsformoistureexpansionanddryingshrinkage; f)thestorageconditionsbetweendeliveryandtest; g)theweightofeachsampleatthetimeofinitialmeasurement,expressedinkgto0,1kg; h)theindividual
