1、BRITISH STANDARD BS EN 12697-8:2003 Bituminous mixtures Test methods for hot mix asphalt Part 8: Determination of void characteristics of bituminous specimens The European Standard EN 12697-8:2003 has the status of a British Standard ICS 93.080.20 BS EN 12697-8:2003 This British Standard was publish
2、ed under the authority of the Standards Policy and Strategy Committee on 2 April 2003 BSI 2 April 2003 ISBN 0 580 41484 1 National foreword This British Standard is the official English language version of EN 12697-8:2003. The UK participation in its preparation was entrusted by Technical Committee
3、B/510, Road materials, to Subcommittee B/510/1, Coated macadam and hot asphalt, 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 publ
4、ications referred 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 ne
5、cessary provisions 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 in
6、terpretation, 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 cover, the EN title page, pages 2 to 9 and a back cover. The BSI c
7、opyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN126978 March2003 ICS93.080.20 Englishversion BituminousmixturesTestmethodsforhotmixasphaltPart8: Determinat
8、ionofvoidcharacteristicsofbituminousspecimens MlangesbitumineuxMthodesdessaipourenrobs chaudPartie8:Dterminationdelateneurenvidesdes prouvettesbitumineuses AsphaltPrfverfahrenfrHeiasphaltTeil8: BestimmungvonvolumetrischenCharakteristikenvon AsphaltProbekrpern ThisEuropeanStandardwasapprovedbyCENon21
9、November2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementC
10、entreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsb
11、odiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandUn ited Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG Mana
12、gementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN126978:2003EEN126978:2003(E) 2 Contents page Foreword3 1 Scope 5 2 Normativereferences 5 3 Termsanddefinitions. .5 4 Determinationoftheairvoidscontent( V
13、m ) 6 5 Determinationofthepercentageofthevoidsinthemineralaggregatefilledwithbinder(VFB) .7 Bibliography 9EN126978:2003(E) 3 Foreword Thisdocument(EN126978:2003)hasbeenpreparedbyTechnicalCommitteeCEN/TC227“Roadmaterials“,the secretariatofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhestatusofa
14、nationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbySeptember2003,andconflictingnationalstandardsshallbewithdrawnatthe latestbyAugust2005. ThisEuropeanStandardisoneofaseriesofstandardsaslistedbelow. EN126971, Bituminousmixtures - Testmethodsforhotmixasphalt - Part1:Sol
15、ublebindercontent EN126972,Bituminousmixtures- Testmethodsforhotmixasphalt - Part2:Determinationofparticlesize distribution EN126973, Bituminousmixtures - Testmethodsforhotmixasphalt - Part3:Binderrecovery:Rotaryevaporator EN126974, Bituminousmixtures- Testmethodsforhotmixasphalt - Part4:Binderrecov
16、ery:Fractionating column EN126975, BituminousmixturesTestmethodsforhotmixasphaltPart5:Determinationofthemaximum density EN126976, Bituminousmixtures - Testmethodsforhotmixasphalt - Part6: Determinationofbulkdensityof bituminousspecimenbyhydrostaticmethod EN126977, Bituminousmixtures - Testmethodsfor
17、hotmixasphalt - Part7:Determinationofbulkdensityof bituminousspecimensbygammarays EN126978, Bituminousmixtures - Testmethodsforhotmixasphalt - Part8:Determinationofvoidcharacteristics ofbituminousmixtures EN126979, Bituminousmixtures - Testmethodsforhotmixasphalt - Part9:Determinationofthereference
18、density EN1269710, Bituminousmixtures - Testmethodsforhotmixasphalt - Part10:Compactibility prEN1269711,Bituminousmixtures - Testmethodsforhotmixasphalt - Part11:Determinationofthe compatabilitybetweenaggregateandbinder prEN1269712, Bituminousmixtures - Testmethodsforhotmixasphalt - Part12:Determina
19、tionofthewater sensitivityofbituminousspecimens EN1269713, Bituminousmixtures - Testmethodsforhotmixasphalt - Part13:Temperaturemeasurement EN1269714, Bituminousmixtures - Testmethodsforhotmixasphalt - Part14:Watercontent EN1269715, Bituminousmixtures - Testmethodsforhotmixasphalt - Part15:Determina
20、tionofthesegregation sensitivity prEN1269716, Bituminousmixtures - Testmethodsforhotmixasphalt - Part16:Abrasionbystuddedtyres prEN1269717 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Part17:Partiallossofporousasphalt specimen prEN1269718 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Pa
21、rt18:Binderdrainagefromporous asphaltEN126978:2003(E) 4 prEN1269719 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Part19:Permeabilityofspecimen prEN1269720,Bituminousmixtures - Testmethodsforhotmixasphalt - Part20:Indentationusingcubeor marshallspecimen prEN1269721,Bituminousmixtures- Testmeth
22、odsforhotmixasphalt - Part21:Indentationusingplate specimens prEN1269722 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Part22:Wheeltracking prEN1269723 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Part23:Determinationoftheindirect tensilestrengthofbituminousspecimens prEN1269724 ,Bitumi
23、nousmixtures - Testmethodsforhotmixasphalt - Part24:Resistancetofatigue prEN1269725 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Part25:Cycliccompressiontest prEN1269726 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Part26:Stiffness EN1269727 ,Bituminousmixtures - Testmethodsforhotmixas
24、phalt - Part27:Sampling EN1269728,Bituminousmixtures- Testmethodsforhotmixasphalt - Part28:Preparationofsamplesfor determiningbindercontent,watercontentandgrading EN1269729 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Part29:Determinationofthedimensions ofbituminousspecimen prEN1269730 ,Bitum
25、inousmixtures - Testmethodsforhotmixasphalt - Part30:Preparationofspecimenby impactcompactor prEN1269731 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Part31:Specimenpreparation,gyratory compactor EN1269732,Bituminousmixtures- Testmethodsforhotmixasphalt - Part32:Laboratorycompactionof bitumin
26、ousmixturesbyavibratorycompactor prEN1269733 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Part33:Specimenpreparation,slab compactor prEN1269734 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Part34:Marshalltest prEN1269735 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Part35:Labora
27、torymixing EN1269736 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Part36:Methodforthedeterminationof thethicknessofabituminouspavement prEN1269737 ,Bituminousmixtures - Testmethodsforhotmixasphalt - Part37:Hotsandtestfortheadhesivity ofbinderonprecoatedchippingsforHRA prEN1269738 ,Bituminousm
28、ixtures - Testmethodsforhotmixasphalt - Part38:Testequipmentandcalibration TheapplicabilityofthisEuropeanStandardisdescribedintheproductstandardsforbituminousmixtures. NoexistingEuropeanStandardissuperseded. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing
29、 countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal, Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN126978:2003(E) 5 1Scope ThisEuropeanStandarddescri
30、besaprocedureforcalculatingtwovolumetriccharacteristicsofacompacted bituminousspecimen:theairvoidscontent( V m )andthevoidscontentinthemineralaggregatefiledwithbinder (VFB). Themethodissuitableforspecimenswhicharelaboratorycompactedorspecimensfromcorescutfromthe pavementafterplacementandcompacting.
31、Thesevolumetriccharacteristicscanbeusedasmixdesigncriteriaorasparametersforevaluatingthemixture afterplacingandcompactingintheroad. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesi
32、nthetextandthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN126975, B
33、ituminousmixtures - Testmethodsforhotmixasphalt - Part5:Determinationofthemaximum density. EN126976, Bituminousmixtures - Testmethodsforhotmixasphalt - Part6:Determinationofbulkdensityof bituminousspecimensbyhydrostaticmethod. 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thefollowingte
34、rmsanddefinitionsapply. 3.1 airvoid pocketofairbetweenthebitumencoatedaggregateparticlesinacompactedbituminousspecimen 3.2 airvoidscontent (V m ) volumeoftheairvoidsinabituminousspecimen,expressedasapercentageofthetotalvolumeofthatspecimen 3.3 maximumdensity massperunitvolumewithoutairvoidsofabitumi
35、nousmaterialatknowntesttemperature 3.4 bulkdensity massperunitvolume,includingtheairvoids,ofaspecimenatknowntesttemperature 3.5 voidinthemineralaggregate (VMA) volumeofintergranularvoidspacebetweentheaggregateparticlesofacompactedbituminousmixturethat includestheairvoidsandthevolumeofthebituminousbi
36、nderinthespecimen,expressedasapercentageofthe totalvolumeofthespecimen NOTE Anallowanceshouldbemadefortheabsorbencyofbinderbytheaggregate,whichcanotherwiseleadtoanover estimationoftheairvoidscontent.Thelevelofabsorbencydependsontheporosityoftheaggregate.EN126978:2003(E) 6 3.6 voidfilledwithbinder (V
37、FB) percentageofthevoidsinthemineralaggregate,filledwithbinder 4 Determinationoftheairvoidscontent( V m ) 4.1Principle Theairvoidscontentofabituminousspecimeniscalculatedusingthemaximumdensityofthemixtureandthe bulkdensityofthespecimen. 4.2Calculation Theairvoidscontentshallbecalculatedtothenearest0
38、,1%(v/v)asfollows: 100 - = m b m m V r r r %(v/v) (1) where V m istheairvoidscontentofthemixture,in0,1percent(v/v); r m isthemaximumdensityofthemixture,inkilogramspercubicmetre(kg/m 3 ); r b isthebulkdensityofthespecimen,inkilogramspercubicmetre(kg/m 3 ). 4.3Precision Calculatetheprecisionofthistest
39、methodfromtheprecisionofthetestmethodsformaximumdensityandbulk densityaccordingtothefollowingformula: 4 2 2 2 2 y x y y x y x s s s + = / (2) where s x/y isthestandarddeviationfordeterminingtheprecisionlimitsofanewstandardbasedontheairvoids contentofthepresentmixture; s x isthestandarddeviationfromt
40、heprecisionstatementEN126975; s y isthestandarddeviationfromtheprecisionstatementEN126976; x isthemeanoraveragevalueofthebulkdensityofthepresentmixture; y isthemeanoraveragevalueofthemaximumdensityofthepresentmixture. Fromtheaveragevaluesof s r and s R asobtainedintestsEN126975andEN126976thisresults
41、inthefollowing valuesfortheairvoidscontentcalculation: Repeatability r: Standarddeviation: s r =0,4%(v/v); Repeatability:r = 2,77 s r =1,1%(v/v)EN126978:2003(E) 7 Reproducibility R: Standarddeviation: s R =0,8%(v/v); Reproducibility: R=2,77 s R =2,2%(v/v). 4.4 Testreport WithreferencetothisEuropeanS
42、tandardthetestreportforthedeterminationoftheairvoidscontent( V m )shall includethefollowinginformation: a) Originofthespecimen; b) methodsusedtodeterminemaximumdensityandbulkdensity; c) amaximumdensityandthebulkdensity,inkilogrampercubicmetre; d) airvoidscontentin0,1%(v/v); 5 Determinationoftheperce
43、ntageofthevoidsinthemineralaggregatefilledwith binder(VFB) 5.1Principle Thepercentageofthevoidsinthemineralaggregateofabituminousspecimenfilledwithbinderiscalculatedfrom thebindercontent,thevoidsinthemineralaggregate,thebulkdensityofthespecimenandthedensityofthe binder. 5.2Calculation Thepercentageofthevoidsintheaggregatefilledwithbindershallbecalculatedtothenearest0,1%(v/v)as follows: () ()( ) v v VMA B VFB B b / % / / 100 = r r
