BS 5328-2-1997 Concrete. Methods for specifying co

ConcretePart2.MethodsforspecifyingconcretemixesICS91.100.30NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWSection1.GeneralIntroductionThisPartofBS5328givesthemethodstobeusedbythepurchaserforspecifyingconcrete.Thestandardisinfivesections:section1General;section2Designedmixes;section3Prescribedmixes;section4Standardmixes;section5Designatedmixes.Section5givesanewmethodofspecifyingconcrete,thedesignatedmix.Thismethodofspecificationisprimarilyaimedatinsituconcreteapplicationsanditisunlikelytobeapplicabletofactoryproducedprecastconcreteproducts.Thepurchaserspecifiesamixdesignationappropriatetotheenduseandthisisaninstructiontotheproducertocomplywiththespecificationgiveninsection5.Thereisalsoarequirementthattheproducerholdscurrentconfonnitycertificationbasedonproducttestingandsurveillancecoupledwithapprovaloftheproducer'squalitysystemtoBSENISO9001byacertificationbodyaccreditedbytheSecretaryofState(orequivalent)fortherelevantareasofproductandsystemsconfonnitycertification,asthisistheprimemeansofcontrollingconformity.Themethods,involvinguseofrelevantinfonnationfromBS5328:Part1:1997,enablethepurchasertospecifyclearlytotheproducertherequisitepropertiesoftheconcrete.OrdinaryprescribedmixesarenowdescribedasstandardmixesusingtheprefixSTtoavoidconfusionwiththegradedesignationofdesignedmixes.Standardmixesof14mmmaximumsizeaggregatehavebeenomittedastheyarerarelyused.AnnexAcontainsformswhichmaybeusedtospecifyeitherdesigned,prescribed,standardordesignatedmixes.Theuseoftheseformsshouldensurethatthepurchaserspecifiesallnecessaryrequirementsandthattheproducerisinpossessionofalltherelevanttechnicaldata.MethodsofassessingconfonnitytospecificationsforconcretemixesdrawnupinaccordancewiththisPartofBS5328aregiveninBS5328:Part4:1990.©BSI1997PurchasersorderinginaccordancewiththisstandardareadvisedtospecifyqualityassurancerequirementsformaterialsorforconcreteintheirpurchasingcontractstoassurethemselvesthatproductsspecifiedinaccordancewithBS5328consistentlyachievetherequiredlevelofquality.Purchasersofready-mixedconcreteareadvisedtospecifycertificationmeetingtherequirementsoftheUnitedKingdomAccreditationService,NationalAccreditationofCertificationBodies,forproductconformity.Theyaresimilarlyadvisedtospecifythat,wheretheyareavailable,constituentmaterialsshouldbeobtainedfromsuppliersoperatingqualitysystemsinaccordancewithBSENISO9000.1.1ScopeThisPartofBS5328givesmethodsforspecifyingconcrete.ItdoesnotapplywhentheconcreteisspecifiedasbeinginaccordancewithanotherBritishStandard1.2References1.2.1NormativereferencesThisPartofBS5328incoxporates,bydatedorundatedreference,provisionsfromotherpublications.Thesenonnativereferencesaremadeattheappropriateplacesinthetextandthecitedpublicationsarelistedontheinsidebackcover.Fordatedreferences,onlytheeditioncitedapplies;anysubsequentamendmentstoorrevisionsofthecitedpublicationapplytothisPartofBS5328onlywhenincoxporatedinthereferencebyamendmentorrevision.Forundatedreferences,thelatesteditionofthecitedpublicationapplies,togetherwithanyamendments.1.2.2InformativereferencesThisPartofBS5328referstootherpublicationsthatprovideinformationorguidance.Editionsofthesepublicationscurrentatthetimeofissueofthisstandardarelistedontheinsidebackcover,butreferenceshouldbemadetothelatesteditions.1.3DefinitionsForthepuxposesofthisPartofBS5328thedefinitionsgiveninBS5328:Part1andBS6100apply.1Section2.Designedmixes2.1DesignedmixThemixshallbespecifiedbyitsrequiredpexfonnanceintennsofastrengthgrade,subjecttoanyrestrictiononmaterials,minimumormaximumcementcontent,maximumfreewater/cementratioandanyotherpropertiesrequiredStrengthtestingshallfonnanessentialpartoftheassessmentofconformitytothespecification.Thepurchasershallprovidetheproducerwithallpertinentinformationontheuseoftheconcreteandthespecifiedrequirements.2.2SelectionofgradeandmaterialsThepurchasershallselectthegradeofconcrete,thelimitingmixparametersandtheconstituentmaterialstosatisfythestrengthanddurabilityrequirements.NOTE.GuidanceisprovidedinBB5328:Partl.WherethereareoptionsinaBritishStandardspecificationforamaterial,thepurchasershallspecifyrestrictionswherenecessary.Ifnonearespecified,anyoftheoptionspermittedintheBritishStandardspecificationsformaterialsandconcretemaybeused2.3Mixspecification2.3.1GeneralThepurchasershallspecifythefollowingtotheproducer:a)thatthemixisadesignedmixtobesuppliedinaccordancewiththerelevantclausesofBS5328:Parts2,3and4;b)theessentialitemsgivenin2.3.2;c)theoptionalitemsgivenin2.3.3asappropriate.NOTE.Toaidthetaskofpreparingaspecification,fonnAinannexAmaybefreelycopiedandused.2.3.2Essentialitems2.3.2.1Thepurchasershallspecifythefollowingtotheproducer:a)thegrade,whichshallbeoneofthevaluesgivenintable1or2asappropriate;b)therequirednominalmaximumsizeofaggregate;c)thepennittedtype(s)ofaggregate;d)thepennittedtype(s)ofcement;e)theminimumcementcontentinkilogramsofcementpercubicmetreoffreshfullycompactedconcrete(seetable14ofBS5328:Part1:1997);t)themaximumfreewater/cementratio(seetable14ofBS5328:Part1:1997);2g)classofexposuretosulfateifappropliate(s