HereisabriefintroductioninEnglishforthe"DeterminationofSpecificSurfaceAreaofCement-BlaineMethod(GBT8074-2008)":ThisstandardspecifiestheBlaineairpermeabilitymethodfordeterminingthespecificsurfaceareaofcement.TheBlainemethodisawidelyusedtechniquetomeasurethefinenessofcementpowderbyevaluatingitsresistancetoairflowthroughacompactedsamplebed.Thestandardoutlinestheapparatusrequired,includingtheBlainepermeabilityapparatus,balance,timer,andancillaryequipment.Itprovidesdetailedproceduresforsamplepreparation,compaction,andtesting.Keystepsinvolveformingacompactedcementbedinthepermeabilitycell,measuringthetimeforafixedvolumeofairtopassthroughthesample,andcalculatingthespecificsurfaceareabasedonfundamentalpermeabilityequations.ThemethodisapplicabletoPortlandcementandsimilarhydrauliccements.Resultsareexpressedinsquarecentimeterspergram(cm²/g)orsquaremetersperkilogram(m²/kg).Thestandardincludesformulasforcalculationsandspecifiestestconditionstoensurereproducibility.ThisChinesenationalstandard(GBT)istechnicallyequivalenttointernationalstandardsforcementfinenesstestingusingtheBlainemethod.Itservesasanauthoritativereferenceforqualitycontrolincementproductionandconstructionapplications.
